drm/i915: Toshiba CB35 has a controllable backlight

[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_display.c

/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *      Eric Anholt <eric@anholt.net>
 */

#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
#include <drm/drm_edid.h>
#include <drm/drmP.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_trace.h"
#include <drm/drm_dp_helper.h>
#include <drm/drm_crtc_helper.h>
#include <linux/dma_remapping.h>

#define DIV_ROUND_CLOSEST_ULL(ll, d)    \
        ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; })

static void intel_increase_pllclock(struct drm_crtc *crtc);
static void intel_crtc_update_cursor(struct drm_crtc *crtc, bool on);

static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_config *pipe_config);
static void ironlake_pch_clock_get(struct intel_crtc *crtc,
                                   struct intel_crtc_config *pipe_config);

static int intel_set_mode(struct drm_crtc *crtc, struct drm_display_mode *mode,
                          int x, int y, struct drm_framebuffer *old_fb);
static int intel_framebuffer_init(struct drm_device *dev,
                                  struct intel_framebuffer *ifb,
                                  struct drm_mode_fb_cmd2 *mode_cmd,
                                  struct drm_i915_gem_object *obj);
static void intel_dp_set_m_n(struct intel_crtc *crtc);
static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc);
static void intel_set_pipe_timings(struct intel_crtc *intel_crtc);
static void intel_cpu_transcoder_set_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n);
static void ironlake_set_pipeconf(struct drm_crtc *crtc);
static void haswell_set_pipeconf(struct drm_crtc *crtc);
static void intel_set_pipe_csc(struct drm_crtc *crtc);
static void vlv_prepare_pll(struct intel_crtc *crtc);

typedef struct {
        int     min, max;
} intel_range_t;

typedef struct {
        int     dot_limit;
        int     p2_slow, p2_fast;
} intel_p2_t;

typedef struct intel_limit intel_limit_t;
struct intel_limit {
        intel_range_t   dot, vco, n, m, m1, m2, p, p1;
        intel_p2_t          p2;
};

int
intel_pch_rawclk(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        WARN_ON(!HAS_PCH_SPLIT(dev));

        return I915_READ(PCH_RAWCLK_FREQ) & RAWCLK_FREQ_MASK;
}

static inline u32 /* units of 100MHz */
intel_fdi_link_freq(struct drm_device *dev)
{
        if (IS_GEN5(dev)) {
                struct drm_i915_private *dev_priv = dev->dev_private;
                return (I915_READ(FDI_PLL_BIOS_0) & FDI_PLL_FB_CLOCK_MASK) + 2;
        } else
                return 27;
}

static const intel_limit_t intel_limits_i8xx_dac = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 2, .max = 33 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 4, .p2_fast = 2 },
};

static const intel_limit_t intel_limits_i8xx_dvo = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 2, .max = 33 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 4, .p2_fast = 4 },
};

static const intel_limit_t intel_limits_i8xx_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 1, .max = 6 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 14, .p2_fast = 7 },
};

static const intel_limit_t intel_limits_i9xx_sdvo = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1400000, .max = 2800000 },
        .n = { .min = 1, .max = 6 },
        .m = { .min = 70, .max = 120 },
        .m1 = { .min = 8, .max = 18 },
        .m2 = { .min = 3, .max = 7 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 200000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const intel_limit_t intel_limits_i9xx_lvds = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1400000, .max = 2800000 },
        .n = { .min = 1, .max = 6 },
        .m = { .min = 70, .max = 120 },
        .m1 = { .min = 8, .max = 18 },
        .m2 = { .min = 3, .max = 7 },
        .p = { .min = 7, .max = 98 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 112000,
                .p2_slow = 14, .p2_fast = 7 },
};


static const intel_limit_t intel_limits_g4x_sdvo = {
        .dot = { .min = 25000, .max = 270000 },
        .vco = { .min = 1750000, .max = 3500000},
        .n = { .min = 1, .max = 4 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 10, .max = 30 },
        .p1 = { .min = 1, .max = 3},
        .p2 = { .dot_limit = 270000,
                .p2_slow = 10,
                .p2_fast = 10
        },
};

static const intel_limit_t intel_limits_g4x_hdmi = {
        .dot = { .min = 22000, .max = 400000 },
        .vco = { .min = 1750000, .max = 3500000},
        .n = { .min = 1, .max = 4 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 16, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8},
        .p2 = { .dot_limit = 165000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const intel_limit_t intel_limits_g4x_single_channel_lvds = {
        .dot = { .min = 20000, .max = 115000 },
        .vco = { .min = 1750000, .max = 3500000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 0,
                .p2_slow = 14, .p2_fast = 14
        },
};

static const intel_limit_t intel_limits_g4x_dual_channel_lvds = {
        .dot = { .min = 80000, .max = 224000 },
        .vco = { .min = 1750000, .max = 3500000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 14, .max = 42 },
        .p1 = { .min = 2, .max = 6 },
        .p2 = { .dot_limit = 0,
                .p2_slow = 7, .p2_fast = 7
        },
};

static const intel_limit_t intel_limits_pineview_sdvo = {
        .dot = { .min = 20000, .max = 400000},
        .vco = { .min = 1700000, .max = 3500000 },
        /* Pineview's Ncounter is a ring counter */
        .n = { .min = 3, .max = 6 },
        .m = { .min = 2, .max = 256 },
        /* Pineview only has one combined m divider, which we treat as m2. */
        .m1 = { .min = 0, .max = 0 },
        .m2 = { .min = 0, .max = 254 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 200000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const intel_limit_t intel_limits_pineview_lvds = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1700000, .max = 3500000 },
        .n = { .min = 3, .max = 6 },
        .m = { .min = 2, .max = 256 },
        .m1 = { .min = 0, .max = 0 },
        .m2 = { .min = 0, .max = 254 },
        .p = { .min = 7, .max = 112 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 112000,
                .p2_slow = 14, .p2_fast = 14 },
};

/* Ironlake / Sandybridge
 *
 * We calculate clock using (register_value + 2) for N/M1/M2, so here
 * the range value for them is (actual_value - 2).
 */
static const intel_limit_t intel_limits_ironlake_dac = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 5 },
        .m = { .min = 79, .max = 127 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const intel_limit_t intel_limits_ironlake_single_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 118 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 14, .p2_fast = 14 },
};

static const intel_limit_t intel_limits_ironlake_dual_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 127 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 14, .max = 56 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 7, .p2_fast = 7 },
};

/* LVDS 100mhz refclk limits. */
static const intel_limit_t intel_limits_ironlake_single_lvds_100m = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 2 },
        .m = { .min = 79, .max = 126 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 14, .p2_fast = 14 },
};

static const intel_limit_t intel_limits_ironlake_dual_lvds_100m = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 126 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 14, .max = 42 },
        .p1 = { .min = 2, .max = 6 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 7, .p2_fast = 7 },
};

static const intel_limit_t intel_limits_vlv = {
         /*
          * These are the data rate limits (measured in fast clocks)
          * since those are the strictest limits we have. The fast
          * clock and actual rate limits are more relaxed, so checking
          * them would make no difference.
          */
        .dot = { .min = 25000 * 5, .max = 270000 * 5 },
        .vco = { .min = 4000000, .max = 6000000 },
        .n = { .min = 1, .max = 7 },
        .m1 = { .min = 2, .max = 3 },
        .m2 = { .min = 11, .max = 156 },
        .p1 = { .min = 2, .max = 3 },
        .p2 = { .p2_slow = 2, .p2_fast = 20 }, /* slow=min, fast=max */
};

static const intel_limit_t intel_limits_chv = {
        /*
         * These are the data rate limits (measured in fast clocks)
         * since those are the strictest limits we have.  The fast
         * clock and actual rate limits are more relaxed, so checking
         * them would make no difference.
         */
        .dot = { .min = 25000 * 5, .max = 540000 * 5},
        .vco = { .min = 4860000, .max = 6700000 },
        .n = { .min = 1, .max = 1 },
        .m1 = { .min = 2, .max = 2 },
        .m2 = { .min = 24 << 22, .max = 175 << 22 },
        .p1 = { .min = 2, .max = 4 },
        .p2 = { .p2_slow = 1, .p2_fast = 14 },
};

static void vlv_clock(int refclk, intel_clock_t *clock)
{
        clock->m = clock->m1 * clock->m2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
}

/**
 * Returns whether any output on the specified pipe is of the specified type
 */
static bool intel_pipe_has_type(struct drm_crtc *crtc, int type)
{
        struct drm_device *dev = crtc->dev;
        struct intel_encoder *encoder;

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->type == type)
                        return true;

        return false;
}

static const intel_limit_t *intel_ironlake_limit(struct drm_crtc *crtc,
                                                int refclk)
{
        struct drm_device *dev = crtc->dev;
        const intel_limit_t *limit;

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
                if (intel_is_dual_link_lvds(dev)) {
                        if (refclk == 100000)
                                limit = &intel_limits_ironlake_dual_lvds_100m;
                        else
                                limit = &intel_limits_ironlake_dual_lvds;
                } else {
                        if (refclk == 100000)
                                limit = &intel_limits_ironlake_single_lvds_100m;
                        else
                                limit = &intel_limits_ironlake_single_lvds;
                }
        } else
                limit = &intel_limits_ironlake_dac;

        return limit;
}

static const intel_limit_t *intel_g4x_limit(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        const intel_limit_t *limit;

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
                if (intel_is_dual_link_lvds(dev))
                        limit = &intel_limits_g4x_dual_channel_lvds;
                else
                        limit = &intel_limits_g4x_single_channel_lvds;
        } else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI) ||
                   intel_pipe_has_type(crtc, INTEL_OUTPUT_ANALOG)) {
                limit = &intel_limits_g4x_hdmi;
        } else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO)) {
                limit = &intel_limits_g4x_sdvo;
        } else /* The option is for other outputs */
                limit = &intel_limits_i9xx_sdvo;

        return limit;
}

static const intel_limit_t *intel_limit(struct drm_crtc *crtc, int refclk)
{
        struct drm_device *dev = crtc->dev;
        const intel_limit_t *limit;

        if (HAS_PCH_SPLIT(dev))
                limit = intel_ironlake_limit(crtc, refclk);
        else if (IS_G4X(dev)) {
                limit = intel_g4x_limit(crtc);
        } else if (IS_PINEVIEW(dev)) {
                if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
                        limit = &intel_limits_pineview_lvds;
                else
                        limit = &intel_limits_pineview_sdvo;
        } else if (IS_CHERRYVIEW(dev)) {
                limit = &intel_limits_chv;
        } else if (IS_VALLEYVIEW(dev)) {
                limit = &intel_limits_vlv;
        } else if (!IS_GEN2(dev)) {
                if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
                        limit = &intel_limits_i9xx_lvds;
                else
                        limit = &intel_limits_i9xx_sdvo;
        } else {
                if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
                        limit = &intel_limits_i8xx_lvds;
                else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DVO))
                        limit = &intel_limits_i8xx_dvo;
                else
                        limit = &intel_limits_i8xx_dac;
        }
        return limit;
}

/* m1 is reserved as 0 in Pineview, n is a ring counter */
static void pineview_clock(int refclk, intel_clock_t *clock)
{
        clock->m = clock->m2 + 2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
}

static uint32_t i9xx_dpll_compute_m(struct dpll *dpll)
{
        return 5 * (dpll->m1 + 2) + (dpll->m2 + 2);
}

static void i9xx_clock(int refclk, intel_clock_t *clock)
{
        clock->m = i9xx_dpll_compute_m(clock);
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n + 2 == 0 || clock->p == 0))
                return;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n + 2);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
}

static void chv_clock(int refclk, intel_clock_t *clock)
{
        clock->m = clock->m1 * clock->m2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return;
        clock->vco = DIV_ROUND_CLOSEST_ULL((uint64_t)refclk * clock->m,
                        clock->n << 22);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
}

#define INTELPllInvalid(s)   do { /* DRM_DEBUG(s); */ return false; } while (0)
/**
 * Returns whether the given set of divisors are valid for a given refclk with
 * the given connectors.
 */

static bool intel_PLL_is_valid(struct drm_device *dev,
                               const intel_limit_t *limit,
                               const intel_clock_t *clock)
{
        if (clock->n   < limit->n.min   || limit->n.max   < clock->n)
                INTELPllInvalid("n out of range\n");
        if (clock->p1  < limit->p1.min  || limit->p1.max  < clock->p1)
                INTELPllInvalid("p1 out of range\n");
        if (clock->m2  < limit->m2.min  || limit->m2.max  < clock->m2)
                INTELPllInvalid("m2 out of range\n");
        if (clock->m1  < limit->m1.min  || limit->m1.max  < clock->m1)
                INTELPllInvalid("m1 out of range\n");

        if (!IS_PINEVIEW(dev) && !IS_VALLEYVIEW(dev))
                if (clock->m1 <= clock->m2)
                        INTELPllInvalid("m1 <= m2\n");

        if (!IS_VALLEYVIEW(dev)) {
                if (clock->p < limit->p.min || limit->p.max < clock->p)
                        INTELPllInvalid("p out of range\n");
                if (clock->m < limit->m.min || limit->m.max < clock->m)
                        INTELPllInvalid("m out of range\n");
        }

        if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
                INTELPllInvalid("vco out of range\n");
        /* XXX: We may need to be checking "Dot clock" depending on the multiplier,
         * connector, etc., rather than just a single range.
         */
        if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
                INTELPllInvalid("dot out of range\n");

        return true;
}

static bool
i9xx_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
                    int target, int refclk, intel_clock_t *match_clock,
                    intel_clock_t *best_clock)
{
        struct drm_device *dev = crtc->dev;
        intel_clock_t clock;
        int err = target;

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
                /*
                 * For LVDS just rely on its current settings for dual-channel.
                 * We haven't figured out how to reliably set up different
                 * single/dual channel state, if we even can.
                 */
                if (intel_is_dual_link_lvds(dev))
                        clock.p2 = limit->p2.p2_fast;
                else
                        clock.p2 = limit->p2.p2_slow;
        } else {
                if (target < limit->p2.dot_limit)
                        clock.p2 = limit->p2.p2_slow;
                else
                        clock.p2 = limit->p2.p2_fast;
        }

        memset(best_clock, 0, sizeof(*best_clock));

        for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
             clock.m1++) {
                for (clock.m2 = limit->m2.min;
                     clock.m2 <= limit->m2.max; clock.m2++) {
                        if (clock.m2 >= clock.m1)
                                break;
                        for (clock.n = limit->n.min;
                             clock.n <= limit->n.max; clock.n++) {
                                for (clock.p1 = limit->p1.min;
                                        clock.p1 <= limit->p1.max; clock.p1++) {
                                        int this_err;

                                        i9xx_clock(refclk, &clock);
                                        if (!intel_PLL_is_valid(dev, limit,
                                                                &clock))
                                                continue;
                                        if (match_clock &&
                                            clock.p != match_clock->p)
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err) {
                                                *best_clock = clock;
                                                err = this_err;
                                        }
                                }
                        }
                }
        }

        return (err != target);
}

static bool
pnv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
                   int target, int refclk, intel_clock_t *match_clock,
                   intel_clock_t *best_clock)
{
        struct drm_device *dev = crtc->dev;
        intel_clock_t clock;
        int err = target;

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
                /*
                 * For LVDS just rely on its current settings for dual-channel.
                 * We haven't figured out how to reliably set up different
                 * single/dual channel state, if we even can.
                 */
                if (intel_is_dual_link_lvds(dev))
                        clock.p2 = limit->p2.p2_fast;
                else
                        clock.p2 = limit->p2.p2_slow;
        } else {
                if (target < limit->p2.dot_limit)
                        clock.p2 = limit->p2.p2_slow;
                else
                        clock.p2 = limit->p2.p2_fast;
        }

        memset(best_clock, 0, sizeof(*best_clock));

        for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
             clock.m1++) {
                for (clock.m2 = limit->m2.min;
                     clock.m2 <= limit->m2.max; clock.m2++) {
                        for (clock.n = limit->n.min;
                             clock.n <= limit->n.max; clock.n++) {
                                for (clock.p1 = limit->p1.min;
                                        clock.p1 <= limit->p1.max; clock.p1++) {
                                        int this_err;

                                        pineview_clock(refclk, &clock);
                                        if (!intel_PLL_is_valid(dev, limit,
                                                                &clock))
                                                continue;
                                        if (match_clock &&
                                            clock.p != match_clock->p)
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err) {
                                                *best_clock = clock;
                                                err = this_err;
                                        }
                                }
                        }
                }
        }

        return (err != target);
}

static bool
g4x_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
                   int target, int refclk, intel_clock_t *match_clock,
                   intel_clock_t *best_clock)
{
        struct drm_device *dev = crtc->dev;
        intel_clock_t clock;
        int max_n;
        bool found;
        /* approximately equals target * 0.00585 */
        int err_most = (target >> 8) + (target >> 9);
        found = false;

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
                if (intel_is_dual_link_lvds(dev))
                        clock.p2 = limit->p2.p2_fast;
                else
                        clock.p2 = limit->p2.p2_slow;
        } else {
                if (target < limit->p2.dot_limit)
                        clock.p2 = limit->p2.p2_slow;
                else
                        clock.p2 = limit->p2.p2_fast;
        }

        memset(best_clock, 0, sizeof(*best_clock));
        max_n = limit->n.max;
        /* based on hardware requirement, prefer smaller n to precision */
        for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
                /* based on hardware requirement, prefere larger m1,m2 */
                for (clock.m1 = limit->m1.max;
                     clock.m1 >= limit->m1.min; clock.m1--) {
                        for (clock.m2 = limit->m2.max;
                             clock.m2 >= limit->m2.min; clock.m2--) {
                                for (clock.p1 = limit->p1.max;
                                     clock.p1 >= limit->p1.min; clock.p1--) {
                                        int this_err;

                                        i9xx_clock(refclk, &clock);
                                        if (!intel_PLL_is_valid(dev, limit,
                                                                &clock))
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err_most) {
                                                *best_clock = clock;
                                                err_most = this_err;
                                                max_n = clock.n;
                                                found = true;
                                        }
                                }
                        }
                }
        }
        return found;
}

static bool
vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
                   int target, int refclk, intel_clock_t *match_clock,
                   intel_clock_t *best_clock)
{
        struct drm_device *dev = crtc->dev;
        intel_clock_t clock;
        unsigned int bestppm = 1000000;
        /* min update 19.2 MHz */
        int max_n = min(limit->n.max, refclk / 19200);
        bool found = false;

        target *= 5; /* fast clock */

        memset(best_clock, 0, sizeof(*best_clock));

        /* based on hardware requirement, prefer smaller n to precision */
        for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
                for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
                        for (clock.p2 = limit->p2.p2_fast; clock.p2 >= limit->p2.p2_slow;
                             clock.p2 -= clock.p2 > 10 ? 2 : 1) {
                                clock.p = clock.p1 * clock.p2;
                                /* based on hardware requirement, prefer bigger m1,m2 values */
                                for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {
                                        unsigned int ppm, diff;

                                        clock.m2 = DIV_ROUND_CLOSEST(target * clock.p * clock.n,
                                                                     refclk * clock.m1);

                                        vlv_clock(refclk, &clock);

                                        if (!intel_PLL_is_valid(dev, limit,
                                                                &clock))
                                                continue;

                                        diff = abs(clock.dot - target);
                                        ppm = div_u64(1000000ULL * diff, target);

                                        if (ppm < 100 && clock.p > best_clock->p) {
                                                bestppm = 0;
                                                *best_clock = clock;
                                                found = true;
                                        }

                                        if (bestppm >= 10 && ppm < bestppm - 10) {
                                                bestppm = ppm;
                                                *best_clock = clock;
                                                found = true;
                                        }
                                }
                        }
                }
        }

        return found;
}

static bool
chv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
                   int target, int refclk, intel_clock_t *match_clock,
                   intel_clock_t *best_clock)
{
        struct drm_device *dev = crtc->dev;
        intel_clock_t clock;
        uint64_t m2;
        int found = false;

        memset(best_clock, 0, sizeof(*best_clock));

        /*
         * Based on hardware doc, the n always set to 1, and m1 always
         * set to 2.  If requires to support 200Mhz refclk, we need to
         * revisit this because n may not 1 anymore.
         */
        clock.n = 1, clock.m1 = 2;
        target *= 5;    /* fast clock */

        for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
                for (clock.p2 = limit->p2.p2_fast;
                                clock.p2 >= limit->p2.p2_slow;
                                clock.p2 -= clock.p2 > 10 ? 2 : 1) {

                        clock.p = clock.p1 * clock.p2;

                        m2 = DIV_ROUND_CLOSEST_ULL(((uint64_t)target * clock.p *
                                        clock.n) << 22, refclk * clock.m1);

                        if (m2 > INT_MAX/clock.m1)
                                continue;

                        clock.m2 = m2;

                        chv_clock(refclk, &clock);

                        if (!intel_PLL_is_valid(dev, limit, &clock))
                                continue;

                        /* based on hardware requirement, prefer bigger p
                         */
                        if (clock.p > best_clock->p) {
                                *best_clock = clock;
                                found = true;
                        }
                }
        }

        return found;
}

bool intel_crtc_active(struct drm_crtc *crtc)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        /* Be paranoid as we can arrive here with only partial
         * state retrieved from the hardware during setup.
         *
         * We can ditch the adjusted_mode.crtc_clock check as soon
         * as Haswell has gained clock readout/fastboot support.
         *
         * We can ditch the crtc->primary->fb check as soon as we can
         * properly reconstruct framebuffers.
         */
        return intel_crtc->active && crtc->primary->fb &&
                intel_crtc->config.adjusted_mode.crtc_clock;
}

enum transcoder intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
                                             enum pipe pipe)
{
        struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        return intel_crtc->config.cpu_transcoder;
}

static void g4x_wait_for_vblank(struct drm_device *dev, int pipe)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 frame, frame_reg = PIPE_FRMCOUNT_GM45(pipe);

        frame = I915_READ(frame_reg);

        if (wait_for(I915_READ_NOTRACE(frame_reg) != frame, 50))
                WARN(1, "vblank wait timed out\n");
}

/**
 * intel_wait_for_vblank - wait for vblank on a given pipe
 * @dev: drm device
 * @pipe: pipe to wait for
 *
 * Wait for vblank to occur on a given pipe.  Needed for various bits of
 * mode setting code.
 */
void intel_wait_for_vblank(struct drm_device *dev, int pipe)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipestat_reg = PIPESTAT(pipe);

        if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
                g4x_wait_for_vblank(dev, pipe);
                return;
        }

        /* Clear existing vblank status. Note this will clear any other
         * sticky status fields as well.
         *
         * This races with i915_driver_irq_handler() with the result
         * that either function could miss a vblank event.  Here it is not
         * fatal, as we will either wait upon the next vblank interrupt or
         * timeout.  Generally speaking intel_wait_for_vblank() is only
         * called during modeset at which time the GPU should be idle and
         * should *not* be performing page flips and thus not waiting on
         * vblanks...
         * Currently, the result of us stealing a vblank from the irq
         * handler is that a single frame will be skipped during swapbuffers.
         */
        I915_WRITE(pipestat_reg,
                   I915_READ(pipestat_reg) | PIPE_VBLANK_INTERRUPT_STATUS);

        /* Wait for vblank interrupt bit to set */
        if (wait_for(I915_READ(pipestat_reg) &
                     PIPE_VBLANK_INTERRUPT_STATUS,
                     50))
                DRM_DEBUG_KMS("vblank wait timed out\n");
}

static bool pipe_dsl_stopped(struct drm_device *dev, enum pipe pipe)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 reg = PIPEDSL(pipe);
        u32 line1, line2;
        u32 line_mask;

        if (IS_GEN2(dev))
                line_mask = DSL_LINEMASK_GEN2;
        else
                line_mask = DSL_LINEMASK_GEN3;

        line1 = I915_READ(reg) & line_mask;
        mdelay(5);
        line2 = I915_READ(reg) & line_mask;

        return line1 == line2;
}

/*
 * intel_wait_for_pipe_off - wait for pipe to turn off
 * @dev: drm device
 * @pipe: pipe to wait for
 *
 * After disabling a pipe, we can't wait for vblank in the usual way,
 * spinning on the vblank interrupt status bit, since we won't actually
 * see an interrupt when the pipe is disabled.
 *
 * On Gen4 and above:
 *   wait for the pipe register state bit to turn off
 *
 * Otherwise:
 *   wait for the display line value to settle (it usually
 *   ends up stopping at the start of the next frame).
 *
 */
void intel_wait_for_pipe_off(struct drm_device *dev, int pipe)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                                                      pipe);

        if (INTEL_INFO(dev)->gen >= 4) {
                int reg = PIPECONF(cpu_transcoder);

                /* Wait for the Pipe State to go off */
                if (wait_for((I915_READ(reg) & I965_PIPECONF_ACTIVE) == 0,
                             100))
                        WARN(1, "pipe_off wait timed out\n");
        } else {
                /* Wait for the display line to settle */
                if (wait_for(pipe_dsl_stopped(dev, pipe), 100))
                        WARN(1, "pipe_off wait timed out\n");
        }
}

/*
 * ibx_digital_port_connected - is the specified port connected?
 * @dev_priv: i915 private structure
 * @port: the port to test
 *
 * Returns true if @port is connected, false otherwise.
 */
bool ibx_digital_port_connected(struct drm_i915_private *dev_priv,
                                struct intel_digital_port *port)
{
        u32 bit;

        if (HAS_PCH_IBX(dev_priv->dev)) {
                switch (port->port) {
                case PORT_B:
                        bit = SDE_PORTB_HOTPLUG;
                        break;
                case PORT_C:
                        bit = SDE_PORTC_HOTPLUG;
                        break;
                case PORT_D:
                        bit = SDE_PORTD_HOTPLUG;
                        break;
                default:
                        return true;
                }
        } else {
                switch (port->port) {
                case PORT_B:
                        bit = SDE_PORTB_HOTPLUG_CPT;
                        break;
                case PORT_C:
                        bit = SDE_PORTC_HOTPLUG_CPT;
                        break;
                case PORT_D:
                        bit = SDE_PORTD_HOTPLUG_CPT;
                        break;
                default:
                        return true;
                }
        }

        return I915_READ(SDEISR) & bit;
}

static const char *state_string(bool enabled)
{
        return enabled ? "on" : "off";
}

/* Only for pre-ILK configs */
void assert_pll(struct drm_i915_private *dev_priv,
                enum pipe pipe, bool state)
{
        int reg;
        u32 val;
        bool cur_state;

        reg = DPLL(pipe);
        val = I915_READ(reg);
        cur_state = !!(val & DPLL_VCO_ENABLE);
        WARN(cur_state != state,
             "PLL state assertion failure (expected %s, current %s)\n",
             state_string(state), state_string(cur_state));
}

/* XXX: the dsi pll is shared between MIPI DSI ports */
static void assert_dsi_pll(struct drm_i915_private *dev_priv, bool state)
{
        u32 val;
        bool cur_state;

        mutex_lock(&dev_priv->dpio_lock);
        val = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
        mutex_unlock(&dev_priv->dpio_lock);

        cur_state = val & DSI_PLL_VCO_EN;
        WARN(cur_state != state,
             "DSI PLL state assertion failure (expected %s, current %s)\n",
             state_string(state), state_string(cur_state));
}
#define assert_dsi_pll_enabled(d) assert_dsi_pll(d, true)
#define assert_dsi_pll_disabled(d) assert_dsi_pll(d, false)

struct intel_shared_dpll *
intel_crtc_to_shared_dpll(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;

        if (crtc->config.shared_dpll < 0)
                return NULL;

        return &dev_priv->shared_dplls[crtc->config.shared_dpll];
}

/* For ILK+ */
void assert_shared_dpll(struct drm_i915_private *dev_priv,
                        struct intel_shared_dpll *pll,
                        bool state)
{
        bool cur_state;
        struct intel_dpll_hw_state hw_state;

        if (HAS_PCH_LPT(dev_priv->dev)) {
                DRM_DEBUG_DRIVER("LPT detected: skipping PCH PLL test\n");
                return;
        }

        if (WARN (!pll,
                  "asserting DPLL %s with no DPLL\n", state_string(state)))
                return;

        cur_state = pll->get_hw_state(dev_priv, pll, &hw_state);
        WARN(cur_state != state,
             "%s assertion failure (expected %s, current %s)\n",
             pll->name, state_string(state), state_string(cur_state));
}

static void assert_fdi_tx(struct drm_i915_private *dev_priv,
                          enum pipe pipe, bool state)
{
        int reg;
        u32 val;
        bool cur_state;
        enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                                                      pipe);

        if (HAS_DDI(dev_priv->dev)) {
                /* DDI does not have a specific FDI_TX register */
                reg = TRANS_DDI_FUNC_CTL(cpu_transcoder);
                val = I915_READ(reg);
                cur_state = !!(val & TRANS_DDI_FUNC_ENABLE);
        } else {
                reg = FDI_TX_CTL(pipe);
                val = I915_READ(reg);
                cur_state = !!(val & FDI_TX_ENABLE);
        }
        WARN(cur_state != state,
             "FDI TX state assertion failure (expected %s, current %s)\n",
             state_string(state), state_string(cur_state));
}
#define assert_fdi_tx_enabled(d, p) assert_fdi_tx(d, p, true)
#define assert_fdi_tx_disabled(d, p) assert_fdi_tx(d, p, false)

static void assert_fdi_rx(struct drm_i915_private *dev_priv,
                          enum pipe pipe, bool state)
{
        int reg;
        u32 val;
        bool cur_state;

        reg = FDI_RX_CTL(pipe);
        val = I915_READ(reg);
        cur_state = !!(val & FDI_RX_ENABLE);
        WARN(cur_state != state,
             "FDI RX state assertion failure (expected %s, current %s)\n",
             state_string(state), state_string(cur_state));
}
#define assert_fdi_rx_enabled(d, p) assert_fdi_rx(d, p, true)
#define assert_fdi_rx_disabled(d, p) assert_fdi_rx(d, p, false)

static void assert_fdi_tx_pll_enabled(struct drm_i915_private *dev_priv,
                                      enum pipe pipe)
{
        int reg;
        u32 val;

        /* ILK FDI PLL is always enabled */
        if (INTEL_INFO(dev_priv->dev)->gen == 5)
                return;

        /* On Haswell, DDI ports are responsible for the FDI PLL setup */
        if (HAS_DDI(dev_priv->dev))
                return;

        reg = FDI_TX_CTL(pipe);
        val = I915_READ(reg);
        WARN(!(val & FDI_TX_PLL_ENABLE), "FDI TX PLL assertion failure, should be active but is disabled\n");
}

void assert_fdi_rx_pll(struct drm_i915_private *dev_priv,
                       enum pipe pipe, bool state)
{
        int reg;
        u32 val;
        bool cur_state;

        reg = FDI_RX_CTL(pipe);
        val = I915_READ(reg);
        cur_state = !!(val & FDI_RX_PLL_ENABLE);
        WARN(cur_state != state,
             "FDI RX PLL assertion failure (expected %s, current %s)\n",
             state_string(state), state_string(cur_state));
}

static void assert_panel_unlocked(struct drm_i915_private *dev_priv,
                                  enum pipe pipe)
{
        int pp_reg, lvds_reg;
        u32 val;
        enum pipe panel_pipe = PIPE_A;
        bool locked = true;

        if (HAS_PCH_SPLIT(dev_priv->dev)) {
                pp_reg = PCH_PP_CONTROL;
                lvds_reg = PCH_LVDS;
        } else {
                pp_reg = PP_CONTROL;
                lvds_reg = LVDS;
        }

        val = I915_READ(pp_reg);
        if (!(val & PANEL_POWER_ON) ||
            ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS))
                locked = false;

        if (I915_READ(lvds_reg) & LVDS_PIPEB_SELECT)
                panel_pipe = PIPE_B;

        WARN(panel_pipe == pipe && locked,
             "panel assertion failure, pipe %c regs locked\n",
             pipe_name(pipe));
}

static void assert_cursor(struct drm_i915_private *dev_priv,
                          enum pipe pipe, bool state)
{
        struct drm_device *dev = dev_priv->dev;
        bool cur_state;

        if (IS_845G(dev) || IS_I865G(dev))
                cur_state = I915_READ(_CURACNTR) & CURSOR_ENABLE;
        else
                cur_state = I915_READ(CURCNTR(pipe)) & CURSOR_MODE;

        WARN(cur_state != state,
             "cursor on pipe %c assertion failure (expected %s, current %s)\n",
             pipe_name(pipe), state_string(state), state_string(cur_state));
}
#define assert_cursor_enabled(d, p) assert_cursor(d, p, true)
#define assert_cursor_disabled(d, p) assert_cursor(d, p, false)

void assert_pipe(struct drm_i915_private *dev_priv,
                 enum pipe pipe, bool state)
{
        int reg;
        u32 val;
        bool cur_state;
        enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                                                      pipe);

        /* if we need the pipe A quirk it must be always on */
        if (pipe == PIPE_A && dev_priv->quirks & QUIRK_PIPEA_FORCE)
                state = true;

        if (!intel_display_power_enabled(dev_priv,
                                POWER_DOMAIN_TRANSCODER(cpu_transcoder))) {
                cur_state = false;
        } else {
                reg = PIPECONF(cpu_transcoder);
                val = I915_READ(reg);
                cur_state = !!(val & PIPECONF_ENABLE);
        }

        WARN(cur_state != state,
             "pipe %c assertion failure (expected %s, current %s)\n",
             pipe_name(pipe), state_string(state), state_string(cur_state));
}

static void assert_plane(struct drm_i915_private *dev_priv,
                         enum plane plane, bool state)
{
        int reg;
        u32 val;
        bool cur_state;

        reg = DSPCNTR(plane);
        val = I915_READ(reg);
        cur_state = !!(val & DISPLAY_PLANE_ENABLE);
        WARN(cur_state != state,
             "plane %c assertion failure (expected %s, current %s)\n",
             plane_name(plane), state_string(state), state_string(cur_state));
}

#define assert_plane_enabled(d, p) assert_plane(d, p, true)
#define assert_plane_disabled(d, p) assert_plane(d, p, false)

static void assert_planes_disabled(struct drm_i915_private *dev_priv,
                                   enum pipe pipe)
{
        struct drm_device *dev = dev_priv->dev;
        int reg, i;
        u32 val;
        int cur_pipe;

        /* Primary planes are fixed to pipes on gen4+ */
        if (INTEL_INFO(dev)->gen >= 4) {
                reg = DSPCNTR(pipe);
                val = I915_READ(reg);
                WARN(val & DISPLAY_PLANE_ENABLE,
                     "plane %c assertion failure, should be disabled but not\n",
                     plane_name(pipe));
                return;
        }

        /* Need to check both planes against the pipe */
        for_each_pipe(i) {
                reg = DSPCNTR(i);
                val = I915_READ(reg);
                cur_pipe = (val & DISPPLANE_SEL_PIPE_MASK) >>
                        DISPPLANE_SEL_PIPE_SHIFT;
                WARN((val & DISPLAY_PLANE_ENABLE) && pipe == cur_pipe,
                     "plane %c assertion failure, should be off on pipe %c but is still active\n",
                     plane_name(i), pipe_name(pipe));
        }
}

static void assert_sprites_disabled(struct drm_i915_private *dev_priv,
                                    enum pipe pipe)
{
        struct drm_device *dev = dev_priv->dev;
        int reg, sprite;
        u32 val;

        if (IS_VALLEYVIEW(dev)) {
                for_each_sprite(pipe, sprite) {
                        reg = SPCNTR(pipe, sprite);
                        val = I915_READ(reg);
                        WARN(val & SP_ENABLE,
                             "sprite %c assertion failure, should be off on pipe %c but is still active\n",
                             sprite_name(pipe, sprite), pipe_name(pipe));
                }
        } else if (INTEL_INFO(dev)->gen >= 7) {
                reg = SPRCTL(pipe);
                val = I915_READ(reg);
                WARN(val & SPRITE_ENABLE,
                     "sprite %c assertion failure, should be off on pipe %c but is still active\n",
                     plane_name(pipe), pipe_name(pipe));
        } else if (INTEL_INFO(dev)->gen >= 5) {
                reg = DVSCNTR(pipe);
                val = I915_READ(reg);
                WARN(val & DVS_ENABLE,
                     "sprite %c assertion failure, should be off on pipe %c but is still active\n",
                     plane_name(pipe), pipe_name(pipe));
        }
}

static void ibx_assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)
{
        u32 val;
        bool enabled;

        WARN_ON(!(HAS_PCH_IBX(dev_priv->dev) || HAS_PCH_CPT(dev_priv->dev)));

        val = I915_READ(PCH_DREF_CONTROL);
        enabled = !!(val & (DREF_SSC_SOURCE_MASK | DREF_NONSPREAD_SOURCE_MASK |
                            DREF_SUPERSPREAD_SOURCE_MASK));
        WARN(!enabled, "PCH refclk assertion failure, should be active but is disabled\n");
}

static void assert_pch_transcoder_disabled(struct drm_i915_private *dev_priv,
                                           enum pipe pipe)
{
        int reg;
        u32 val;
        bool enabled;

        reg = PCH_TRANSCONF(pipe);
        val = I915_READ(reg);
        enabled = !!(val & TRANS_ENABLE);
        WARN(enabled,
             "transcoder assertion failed, should be off on pipe %c but is still active\n",
             pipe_name(pipe));
}

static bool dp_pipe_enabled(struct drm_i915_private *dev_priv,
                            enum pipe pipe, u32 port_sel, u32 val)
{
        if ((val & DP_PORT_EN) == 0)
                return false;

        if (HAS_PCH_CPT(dev_priv->dev)) {
                u32     trans_dp_ctl_reg = TRANS_DP_CTL(pipe);
                u32     trans_dp_ctl = I915_READ(trans_dp_ctl_reg);
                if ((trans_dp_ctl & TRANS_DP_PORT_SEL_MASK) != port_sel)
                        return false;
        } else if (IS_CHERRYVIEW(dev_priv->dev)) {
                if ((val & DP_PIPE_MASK_CHV) != DP_PIPE_SELECT_CHV(pipe))
                        return false;
        } else {
                if ((val & DP_PIPE_MASK) != (pipe << 30))
                        return false;
        }
        return true;
}

static bool hdmi_pipe_enabled(struct drm_i915_private *dev_priv,
                              enum pipe pipe, u32 val)
{
        if ((val & SDVO_ENABLE) == 0)
                return false;

        if (HAS_PCH_CPT(dev_priv->dev)) {
                if ((val & SDVO_PIPE_SEL_MASK_CPT) != SDVO_PIPE_SEL_CPT(pipe))
                        return false;
        } else if (IS_CHERRYVIEW(dev_priv->dev)) {
                if ((val & SDVO_PIPE_SEL_MASK_CHV) != SDVO_PIPE_SEL_CHV(pipe))
                        return false;
        } else {
                if ((val & SDVO_PIPE_SEL_MASK) != SDVO_PIPE_SEL(pipe))
                        return false;
        }
        return true;
}

static bool lvds_pipe_enabled(struct drm_i915_private *dev_priv,
                              enum pipe pipe, u32 val)
{
        if ((val & LVDS_PORT_EN) == 0)
                return false;

        if (HAS_PCH_CPT(dev_priv->dev)) {
                if ((val & PORT_TRANS_SEL_MASK) != PORT_TRANS_SEL_CPT(pipe))
                        return false;
        } else {
                if ((val & LVDS_PIPE_MASK) != LVDS_PIPE(pipe))
                        return false;
        }
        return true;
}

static bool adpa_pipe_enabled(struct drm_i915_private *dev_priv,
                              enum pipe pipe, u32 val)
{
        if ((val & ADPA_DAC_ENABLE) == 0)
                return false;
        if (HAS_PCH_CPT(dev_priv->dev)) {
                if ((val & PORT_TRANS_SEL_MASK) != PORT_TRANS_SEL_CPT(pipe))
                        return false;
        } else {
                if ((val & ADPA_PIPE_SELECT_MASK) != ADPA_PIPE_SELECT(pipe))
                        return false;
        }
        return true;
}

static void assert_pch_dp_disabled(struct drm_i915_private *dev_priv,
                                   enum pipe pipe, int reg, u32 port_sel)
{
        u32 val = I915_READ(reg);
        WARN(dp_pipe_enabled(dev_priv, pipe, port_sel, val),
             "PCH DP (0x%08x) enabled on transcoder %c, should be disabled\n",
             reg, pipe_name(pipe));

        WARN(HAS_PCH_IBX(dev_priv->dev) && (val & DP_PORT_EN) == 0
             && (val & DP_PIPEB_SELECT),
             "IBX PCH dp port still using transcoder B\n");
}

static void assert_pch_hdmi_disabled(struct drm_i915_private *dev_priv,
                                     enum pipe pipe, int reg)
{
        u32 val = I915_READ(reg);
        WARN(hdmi_pipe_enabled(dev_priv, pipe, val),
             "PCH HDMI (0x%08x) enabled on transcoder %c, should be disabled\n",
             reg, pipe_name(pipe));

        WARN(HAS_PCH_IBX(dev_priv->dev) && (val & SDVO_ENABLE) == 0
             && (val & SDVO_PIPE_B_SELECT),
             "IBX PCH hdmi port still using transcoder B\n");
}

static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
                                      enum pipe pipe)
{
        int reg;
        u32 val;

        assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_B, TRANS_DP_PORT_SEL_B);
        assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_C, TRANS_DP_PORT_SEL_C);
        assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_D, TRANS_DP_PORT_SEL_D);

        reg = PCH_ADPA;
        val = I915_READ(reg);
        WARN(adpa_pipe_enabled(dev_priv, pipe, val),
             "PCH VGA enabled on transcoder %c, should be disabled\n",
             pipe_name(pipe));

        reg = PCH_LVDS;
        val = I915_READ(reg);
        WARN(lvds_pipe_enabled(dev_priv, pipe, val),
             "PCH LVDS enabled on transcoder %c, should be disabled\n",
             pipe_name(pipe));

        assert_pch_hdmi_disabled(dev_priv, pipe, PCH_HDMIB);
        assert_pch_hdmi_disabled(dev_priv, pipe, PCH_HDMIC);
        assert_pch_hdmi_disabled(dev_priv, pipe, PCH_HDMID);
}

static void intel_init_dpio(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (!IS_VALLEYVIEW(dev))
                return;

        /*
         * IOSF_PORT_DPIO is used for VLV x2 PHY (DP/HDMI B and C),
         * CHV x1 PHY (DP/HDMI D)
         * IOSF_PORT_DPIO_2 is used for CHV x2 PHY (DP/HDMI B and C)
         */
        if (IS_CHERRYVIEW(dev)) {
                DPIO_PHY_IOSF_PORT(DPIO_PHY0) = IOSF_PORT_DPIO_2;
                DPIO_PHY_IOSF_PORT(DPIO_PHY1) = IOSF_PORT_DPIO;
        } else {
                DPIO_PHY_IOSF_PORT(DPIO_PHY0) = IOSF_PORT_DPIO;
        }
}

static void intel_reset_dpio(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (!IS_VALLEYVIEW(dev))
                return;

        if (IS_CHERRYVIEW(dev)) {
                enum dpio_phy phy;
                u32 val;

                for (phy = DPIO_PHY0; phy < I915_NUM_PHYS_VLV; phy++) {
                        /* Poll for phypwrgood signal */
                        if (wait_for(I915_READ(DISPLAY_PHY_STATUS) &
                                                PHY_POWERGOOD(phy), 1))
                                DRM_ERROR("Display PHY %d is not power up\n", phy);

                        /*
                         * Deassert common lane reset for PHY.
                         *
                         * This should only be done on init and resume from S3
                         * with both PLLs disabled, or we risk losing DPIO and
                         * PLL synchronization.
                         */
                        val = I915_READ(DISPLAY_PHY_CONTROL);
                        I915_WRITE(DISPLAY_PHY_CONTROL,
                                PHY_COM_LANE_RESET_DEASSERT(phy, val));
                }

        } else {
                /*
                 * If DPIO has already been reset, e.g. by BIOS, just skip all
                 * this.
                 */
                if (I915_READ(DPIO_CTL) & DPIO_CMNRST)
                        return;

                /*
                 * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx:
                 * Need to assert and de-assert PHY SB reset by gating the
                 * common lane power, then un-gating it.
                 * Simply ungating isn't enough to reset the PHY enough to get
                 * ports and lanes running.
                 */
                __vlv_set_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC,
                                     false);
                __vlv_set_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC,
                                     true);
        }
}

static void vlv_enable_pll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int reg = DPLL(crtc->pipe);
        u32 dpll = crtc->config.dpll_hw_state.dpll;

        assert_pipe_disabled(dev_priv, crtc->pipe);

        /* No really, not for ILK+ */
        BUG_ON(!IS_VALLEYVIEW(dev_priv->dev));

        /* PLL is protected by panel, make sure we can write it */
        if (IS_MOBILE(dev_priv->dev) && !IS_I830(dev_priv->dev))
                assert_panel_unlocked(dev_priv, crtc->pipe);

        I915_WRITE(reg, dpll);
        POSTING_READ(reg);
        udelay(150);

        if (wait_for(((I915_READ(reg) & DPLL_LOCK_VLV) == DPLL_LOCK_VLV), 1))
                DRM_ERROR("DPLL %d failed to lock\n", crtc->pipe);

        I915_WRITE(DPLL_MD(crtc->pipe), crtc->config.dpll_hw_state.dpll_md);
        POSTING_READ(DPLL_MD(crtc->pipe));

        /* We do this three times for luck */
        I915_WRITE(reg, dpll);
        POSTING_READ(reg);
        udelay(150); /* wait for warmup */
        I915_WRITE(reg, dpll);
        POSTING_READ(reg);
        udelay(150); /* wait for warmup */
        I915_WRITE(reg, dpll);
        POSTING_READ(reg);
        udelay(150); /* wait for warmup */
}

static void chv_enable_pll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = crtc->pipe;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 tmp;

        assert_pipe_disabled(dev_priv, crtc->pipe);

        BUG_ON(!IS_CHERRYVIEW(dev_priv->dev));

        mutex_lock(&dev_priv->dpio_lock);

        /* Enable back the 10bit clock to display controller */
        tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
        tmp |= DPIO_DCLKP_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), tmp);

        /*
         * Need to wait > 100ns between dclkp clock enable bit and PLL enable.
         */
        udelay(1);

        /* Enable PLL */
        I915_WRITE(DPLL(pipe), crtc->config.dpll_hw_state.dpll);

        /* Check PLL is locked */
        if (wait_for(((I915_READ(DPLL(pipe)) & DPLL_LOCK_VLV) == DPLL_LOCK_VLV), 1))
                DRM_ERROR("PLL %d failed to lock\n", pipe);

        /* not sure when this should be written */
        I915_WRITE(DPLL_MD(pipe), crtc->config.dpll_hw_state.dpll_md);
        POSTING_READ(DPLL_MD(pipe));

        mutex_unlock(&dev_priv->dpio_lock);
}

static void i9xx_enable_pll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int reg = DPLL(crtc->pipe);
        u32 dpll = crtc->config.dpll_hw_state.dpll;

        assert_pipe_disabled(dev_priv, crtc->pipe);

        /* No really, not for ILK+ */
        BUG_ON(INTEL_INFO(dev)->gen >= 5);

        /* PLL is protected by panel, make sure we can write it */
        if (IS_MOBILE(dev) && !IS_I830(dev))
                assert_panel_unlocked(dev_priv, crtc->pipe);

        I915_WRITE(reg, dpll);

        /* Wait for the clocks to stabilize. */
        POSTING_READ(reg);
        udelay(150);

        if (INTEL_INFO(dev)->gen >= 4) {
                I915_WRITE(DPLL_MD(crtc->pipe),
                           crtc->config.dpll_hw_state.dpll_md);
        } else {
                /* The pixel multiplier can only be updated once the
                 * DPLL is enabled and the clocks are stable.
                 *
                 * So write it again.
                 */
                I915_WRITE(reg, dpll);
        }

        /* We do this three times for luck */
        I915_WRITE(reg, dpll);
        POSTING_READ(reg);
        udelay(150); /* wait for warmup */
        I915_WRITE(reg, dpll);
        POSTING_READ(reg);
        udelay(150); /* wait for warmup */
        I915_WRITE(reg, dpll);
        POSTING_READ(reg);
        udelay(150); /* wait for warmup */
}

/**
 * i9xx_disable_pll - disable a PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to disable
 *
 * Disable the PLL for @pipe, making sure the pipe is off first.
 *
 * Note!  This is for pre-ILK only.
 */
static void i9xx_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        /* Don't disable pipe A or pipe A PLLs if needed */
        if (pipe == PIPE_A && (dev_priv->quirks & QUIRK_PIPEA_FORCE))
                return;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, pipe);

        I915_WRITE(DPLL(pipe), 0);
        POSTING_READ(DPLL(pipe));
}

static void vlv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        u32 val = 0;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, pipe);

        /*
         * Leave integrated clock source and reference clock enabled for pipe B.
         * The latter is needed for VGA hotplug / manual detection.
         */
        if (pipe == PIPE_B)
                val = DPLL_INTEGRATED_CRI_CLK_VLV | DPLL_REFA_CLK_ENABLE_VLV;
        I915_WRITE(DPLL(pipe), val);
        POSTING_READ(DPLL(pipe));

}

static void chv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 val;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, pipe);

        /* Set PLL en = 0 */
        val = DPLL_SSC_REF_CLOCK_CHV;
        if (pipe != PIPE_A)
                val |= DPLL_INTEGRATED_CRI_CLK_VLV;
        I915_WRITE(DPLL(pipe), val);
        POSTING_READ(DPLL(pipe));

        mutex_lock(&dev_priv->dpio_lock);

        /* Disable 10bit clock to display controller */
        val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
        val &= ~DPIO_DCLKP_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), val);

        mutex_unlock(&dev_priv->dpio_lock);
}

void vlv_wait_port_ready(struct drm_i915_private *dev_priv,
                struct intel_digital_port *dport)
{
        u32 port_mask;
        int dpll_reg;

        switch (dport->port) {
        case PORT_B:
                port_mask = DPLL_PORTB_READY_MASK;
                dpll_reg = DPLL(0);
                break;
        case PORT_C:
                port_mask = DPLL_PORTC_READY_MASK;
                dpll_reg = DPLL(0);
                break;
        case PORT_D:
                port_mask = DPLL_PORTD_READY_MASK;
                dpll_reg = DPIO_PHY_STATUS;
                break;
        default:
                BUG();
        }

        if (wait_for((I915_READ(dpll_reg) & port_mask) == 0, 1000))
                WARN(1, "timed out waiting for port %c ready: 0x%08x\n",
                     port_name(dport->port), I915_READ(dpll_reg));
}

static void intel_prepare_shared_dpll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_shared_dpll *pll = intel_crtc_to_shared_dpll(crtc);

        WARN_ON(!pll->refcount);
        if (pll->active == 0) {
                DRM_DEBUG_DRIVER("setting up %s\n", pll->name);
                WARN_ON(pll->on);
                assert_shared_dpll_disabled(dev_priv, pll);

                pll->mode_set(dev_priv, pll);
        }
}

/**
 * intel_enable_shared_dpll - enable PCH PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to enable
 *
 * The PCH PLL needs to be enabled before the PCH transcoder, since it
 * drives the transcoder clock.
 */
static void intel_enable_shared_dpll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_shared_dpll *pll = intel_crtc_to_shared_dpll(crtc);

        if (WARN_ON(pll == NULL))
                return;

        if (WARN_ON(pll->refcount == 0))
                return;

        DRM_DEBUG_KMS("enable %s (active %d, on? %d)for crtc %d\n",
                      pll->name, pll->active, pll->on,
                      crtc->base.base.id);

        if (pll->active++) {
                WARN_ON(!pll->on);
                assert_shared_dpll_enabled(dev_priv, pll);
                return;
        }
        WARN_ON(pll->on);

        DRM_DEBUG_KMS("enabling %s\n", pll->name);
        pll->enable(dev_priv, pll);
        pll->on = true;
}

static void intel_disable_shared_dpll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_shared_dpll *pll = intel_crtc_to_shared_dpll(crtc);

        /* PCH only available on ILK+ */
        BUG_ON(INTEL_INFO(dev)->gen < 5);
        if (WARN_ON(pll == NULL))
               return;

        if (WARN_ON(pll->refcount == 0))
                return;

        DRM_DEBUG_KMS("disable %s (active %d, on? %d) for crtc %d\n",
                      pll->name, pll->active, pll->on,
                      crtc->base.base.id);

        if (WARN_ON(pll->active == 0)) {
                assert_shared_dpll_disabled(dev_priv, pll);
                return;
        }

        assert_shared_dpll_enabled(dev_priv, pll);
        WARN_ON(!pll->on);
        if (--pll->active)
                return;

        DRM_DEBUG_KMS("disabling %s\n", pll->name);
        pll->disable(dev_priv, pll);
        pll->on = false;
}

static void ironlake_enable_pch_transcoder(struct drm_i915_private *dev_priv,
                                           enum pipe pipe)
{
        struct drm_device *dev = dev_priv->dev;
        struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        uint32_t reg, val, pipeconf_val;

        /* PCH only available on ILK+ */
        BUG_ON(INTEL_INFO(dev)->gen < 5);

        /* Make sure PCH DPLL is enabled */
        assert_shared_dpll_enabled(dev_priv,
                                   intel_crtc_to_shared_dpll(intel_crtc));

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, pipe);
        assert_fdi_rx_enabled(dev_priv, pipe);

        if (HAS_PCH_CPT(dev)) {
                /* Workaround: Set the timing override bit before enabling the
                 * pch transcoder. */
                reg = TRANS_CHICKEN2(pipe);
                val = I915_READ(reg);
                val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
                I915_WRITE(reg, val);
        }

        reg = PCH_TRANSCONF(pipe);
        val = I915_READ(reg);
        pipeconf_val = I915_READ(PIPECONF(pipe));

        if (HAS_PCH_IBX(dev_priv->dev)) {
                /*
                 * make the BPC in transcoder be consistent with
                 * that in pipeconf reg.
                 */
                val &= ~PIPECONF_BPC_MASK;
                val |= pipeconf_val & PIPECONF_BPC_MASK;
        }

        val &= ~TRANS_INTERLACE_MASK;
        if ((pipeconf_val & PIPECONF_INTERLACE_MASK) == PIPECONF_INTERLACED_ILK)
                if (HAS_PCH_IBX(dev_priv->dev) &&
                    intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO))
                        val |= TRANS_LEGACY_INTERLACED_ILK;
                else
                        val |= TRANS_INTERLACED;
        else
                val |= TRANS_PROGRESSIVE;

        I915_WRITE(reg, val | TRANS_ENABLE);
        if (wait_for(I915_READ(reg) & TRANS_STATE_ENABLE, 100))
                DRM_ERROR("failed to enable transcoder %c\n", pipe_name(pipe));
}

static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
                                      enum transcoder cpu_transcoder)
{
        u32 val, pipeconf_val;

        /* PCH only available on ILK+ */
        BUG_ON(INTEL_INFO(dev_priv->dev)->gen < 5);

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, (enum pipe) cpu_transcoder);
        assert_fdi_rx_enabled(dev_priv, TRANSCODER_A);

        /* Workaround: set timing override bit. */
        val = I915_READ(_TRANSA_CHICKEN2);
        val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
        I915_WRITE(_TRANSA_CHICKEN2, val);

        val = TRANS_ENABLE;
        pipeconf_val = I915_READ(PIPECONF(cpu_transcoder));

        if ((pipeconf_val & PIPECONF_INTERLACE_MASK_HSW) ==
            PIPECONF_INTERLACED_ILK)
                val |= TRANS_INTERLACED;
        else
                val |= TRANS_PROGRESSIVE;

        I915_WRITE(LPT_TRANSCONF, val);
        if (wait_for(I915_READ(LPT_TRANSCONF) & TRANS_STATE_ENABLE, 100))
                DRM_ERROR("Failed to enable PCH transcoder\n");
}

static void ironlake_disable_pch_transcoder(struct drm_i915_private *dev_priv,
                                            enum pipe pipe)
{
        struct drm_device *dev = dev_priv->dev;
        uint32_t reg, val;

        /* FDI relies on the transcoder */
        assert_fdi_tx_disabled(dev_priv, pipe);
        assert_fdi_rx_disabled(dev_priv, pipe);

        /* Ports must be off as well */
        assert_pch_ports_disabled(dev_priv, pipe);

        reg = PCH_TRANSCONF(pipe);
        val = I915_READ(reg);
        val &= ~TRANS_ENABLE;
        I915_WRITE(reg, val);
        /* wait for PCH transcoder off, transcoder state */
        if (wait_for((I915_READ(reg) & TRANS_STATE_ENABLE) == 0, 50))
                DRM_ERROR("failed to disable transcoder %c\n", pipe_name(pipe));

        if (!HAS_PCH_IBX(dev)) {
                /* Workaround: Clear the timing override chicken bit again. */
                reg = TRANS_CHICKEN2(pipe);
                val = I915_READ(reg);
                val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
                I915_WRITE(reg, val);
        }
}

static void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
{
        u32 val;

        val = I915_READ(LPT_TRANSCONF);
        val &= ~TRANS_ENABLE;
        I915_WRITE(LPT_TRANSCONF, val);
        /* wait for PCH transcoder off, transcoder state */
        if (wait_for((I915_READ(LPT_TRANSCONF) & TRANS_STATE_ENABLE) == 0, 50))
                DRM_ERROR("Failed to disable PCH transcoder\n");

        /* Workaround: clear timing override bit. */
        val = I915_READ(_TRANSA_CHICKEN2);
        val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
        I915_WRITE(_TRANSA_CHICKEN2, val);
}

/**
 * intel_enable_pipe - enable a pipe, asserting requirements
 * @crtc: crtc responsible for the pipe
 *
 * Enable @crtc's pipe, making sure that various hardware specific requirements
 * are met, if applicable, e.g. PLL enabled, LVDS pairs enabled, etc.
 */
static void intel_enable_pipe(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum pipe pipe = crtc->pipe;
        enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                                                      pipe);
        enum pipe pch_transcoder;
        int reg;
        u32 val;

        assert_planes_disabled(dev_priv, pipe);
        assert_cursor_disabled(dev_priv, pipe);
        assert_sprites_disabled(dev_priv, pipe);

        if (HAS_PCH_LPT(dev_priv->dev))
                pch_transcoder = TRANSCODER_A;
        else
                pch_transcoder = pipe;

        /*
         * A pipe without a PLL won't actually be able to drive bits from
         * a plane.  On ILK+ the pipe PLLs are integrated, so we don't
         * need the check.
         */
        if (!HAS_PCH_SPLIT(dev_priv->dev))
                if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_DSI))
                        assert_dsi_pll_enabled(dev_priv);
                else
                        assert_pll_enabled(dev_priv, pipe);
        else {
                if (crtc->config.has_pch_encoder) {
                        /* if driving the PCH, we need FDI enabled */
                        assert_fdi_rx_pll_enabled(dev_priv, pch_transcoder);
                        assert_fdi_tx_pll_enabled(dev_priv,
                                                  (enum pipe) cpu_transcoder);
                }
                /* FIXME: assert CPU port conditions for SNB+ */
        }

        reg = PIPECONF(cpu_transcoder);
        val = I915_READ(reg);
        if (val & PIPECONF_ENABLE) {
                WARN_ON(!(pipe == PIPE_A &&
                          dev_priv->quirks & QUIRK_PIPEA_FORCE));
                return;
        }

        I915_WRITE(reg, val | PIPECONF_ENABLE);
        POSTING_READ(reg);
}

/**
 * intel_disable_pipe - disable a pipe, asserting requirements
 * @dev_priv: i915 private structure
 * @pipe: pipe to disable
 *
 * Disable @pipe, making sure that various hardware specific requirements
 * are met, if applicable, e.g. plane disabled, panel fitter off, etc.
 *
 * @pipe should be %PIPE_A or %PIPE_B.
 *
 * Will wait until the pipe has shut down before returning.
 */
static void intel_disable_pipe(struct drm_i915_private *dev_priv,
                               enum pipe pipe)
{
        enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                                                      pipe);
        int reg;
        u32 val;

        /*
         * Make sure planes won't keep trying to pump pixels to us,
         * or we might hang the display.
         */
        assert_planes_disabled(dev_priv, pipe);
        assert_cursor_disabled(dev_priv, pipe);
        assert_sprites_disabled(dev_priv, pipe);

        /* Don't disable pipe A or pipe A PLLs if needed */
        if (pipe == PIPE_A && (dev_priv->quirks & QUIRK_PIPEA_FORCE))
                return;

        reg = PIPECONF(cpu_transcoder);
        val = I915_READ(reg);
        if ((val & PIPECONF_ENABLE) == 0)
                return;

        I915_WRITE(reg, val & ~PIPECONF_ENABLE);
        intel_wait_for_pipe_off(dev_priv->dev, pipe);
}

/*
 * Plane regs are double buffered, going from enabled->disabled needs a
 * trigger in order to latch.  The display address reg provides this.
 */
void intel_flush_primary_plane(struct drm_i915_private *dev_priv,
                               enum plane plane)
{
        struct drm_device *dev = dev_priv->dev;
        u32 reg = INTEL_INFO(dev)->gen >= 4 ? DSPSURF(plane) : DSPADDR(plane);

        I915_WRITE(reg, I915_READ(reg));
        POSTING_READ(reg);
}

/**
 * intel_enable_primary_hw_plane - enable the primary plane on a given pipe
 * @dev_priv: i915 private structure
 * @plane: plane to enable
 * @pipe: pipe being fed
 *
 * Enable @plane on @pipe, making sure that @pipe is running first.
 */
static void intel_enable_primary_hw_plane(struct drm_i915_private *dev_priv,
                                          enum plane plane, enum pipe pipe)
{
        struct drm_device *dev = dev_priv->dev;
        struct intel_crtc *intel_crtc =
                to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
        int reg;
        u32 val;

        /* If the pipe isn't enabled, we can't pump pixels and may hang */
        assert_pipe_enabled(dev_priv, pipe);

        if (intel_crtc->primary_enabled)
                return;

        intel_crtc->primary_enabled = true;

        reg = DSPCNTR(plane);
        val = I915_READ(reg);
        WARN_ON(val & DISPLAY_PLANE_ENABLE);

        I915_WRITE(reg, val | DISPLAY_PLANE_ENABLE);
        intel_flush_primary_plane(dev_priv, plane);

        /*
         * BDW signals flip done immediately if the plane
         * is disabled, even if the plane enable is already
         * armed to occur at the next vblank :(
         */
        if (IS_BROADWELL(dev))
                intel_wait_for_vblank(dev, intel_crtc->pipe);
}

/**
 * intel_disable_primary_hw_plane - disable the primary hardware plane
 * @dev_priv: i915 private structure
 * @plane: plane to disable
 * @pipe: pipe consuming the data
 *
 * Disable @plane; should be an independent operation.
 */
static void intel_disable_primary_hw_plane(struct drm_i915_private *dev_priv,
                                           enum plane plane, enum pipe pipe)
{
        struct intel_crtc *intel_crtc =
                to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
        int reg;
        u32 val;

        if (!intel_crtc->primary_enabled)
                return;

        intel_crtc->primary_enabled = false;

        reg = DSPCNTR(plane);
        val = I915_READ(reg);
        WARN_ON((val & DISPLAY_PLANE_ENABLE) == 0);

        I915_WRITE(reg, val & ~DISPLAY_PLANE_ENABLE);
        intel_flush_primary_plane(dev_priv, plane);
}

static bool need_vtd_wa(struct drm_device *dev)
{
#ifdef CONFIG_INTEL_IOMMU
        if (INTEL_INFO(dev)->gen >= 6 && intel_iommu_gfx_mapped)
                return true;
#endif
        return false;
}

static int intel_align_height(struct drm_device *dev, int height, bool tiled)
{
        int tile_height;

        tile_height = tiled ? (IS_GEN2(dev) ? 16 : 8) : 1;
        return ALIGN(height, tile_height);
}

int
intel_pin_and_fence_fb_obj(struct drm_device *dev,
                           struct drm_i915_gem_object *obj,
                           struct intel_engine_cs *pipelined)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 alignment;
        int ret;

        switch (obj->tiling_mode) {
        case I915_TILING_NONE:
                if (IS_BROADWATER(dev) || IS_CRESTLINE(dev))
                        alignment = 128 * 1024;
                else if (INTEL_INFO(dev)->gen >= 4)
                        alignment = 4 * 1024;
                else
                        alignment = 64 * 1024;
                break;
        case I915_TILING_X:
                /* pin() will align the object as required by fence */
                alignment = 0;
                break;
        case I915_TILING_Y:
                WARN(1, "Y tiled bo slipped through, driver bug!\n");
                return -EINVAL;
        default:
                BUG();
        }

        /* Note that the w/a also requires 64 PTE of padding following the
         * bo. We currently fill all unused PTE with the shadow page and so
         * we should always have valid PTE following the scanout preventing
         * the VT-d warning.
         */
        if (need_vtd_wa(dev) && alignment < 256 * 1024)
                alignment = 256 * 1024;

        dev_priv->mm.interruptible = false;
        ret = i915_gem_object_pin_to_display_plane(obj, alignment, pipelined);
        if (ret)
                goto err_interruptible;

        /* Install a fence for tiled scan-out. Pre-i965 always needs a
         * fence, whereas 965+ only requires a fence if using
         * framebuffer compression.  For simplicity, we always install
         * a fence as the cost is not that onerous.
         */
        ret = i915_gem_object_get_fence(obj);
        if (ret)
                goto err_unpin;

        i915_gem_object_pin_fence(obj);

        dev_priv->mm.interruptible = true;
        return 0;

err_unpin:
        i915_gem_object_unpin_from_display_plane(obj);
err_interruptible:
        dev_priv->mm.interruptible = true;
        return ret;
}

void intel_unpin_fb_obj(struct drm_i915_gem_object *obj)
{
        i915_gem_object_unpin_fence(obj);
        i915_gem_object_unpin_from_display_plane(obj);
}

/* Computes the linear offset to the base tile and adjusts x, y. bytes per pixel
 * is assumed to be a power-of-two. */
unsigned long intel_gen4_compute_page_offset(int *x, int *y,
                                             unsigned int tiling_mode,
                                             unsigned int cpp,
                                             unsigned int pitch)
{
        if (tiling_mode != I915_TILING_NONE) {
                unsigned int tile_rows, tiles;

                tile_rows = *y / 8;
                *y %= 8;

                tiles = *x / (512/cpp);
                *x %= 512/cpp;

                return tile_rows * pitch * 8 + tiles * 4096;
        } else {
                unsigned int offset;

                offset = *y * pitch + *x * cpp;
                *y = 0;
                *x = (offset & 4095) / cpp;
                return offset & -4096;
        }
}

int intel_format_to_fourcc(int format)
{
        switch (format) {
        case DISPPLANE_8BPP:
                return DRM_FORMAT_C8;
        case DISPPLANE_BGRX555:
                return DRM_FORMAT_XRGB1555;
        case DISPPLANE_BGRX565:
                return DRM_FORMAT_RGB565;
        default:
        case DISPPLANE_BGRX888:
                return DRM_FORMAT_XRGB8888;
        case DISPPLANE_RGBX888:
                return DRM_FORMAT_XBGR8888;
        case DISPPLANE_BGRX101010:
                return DRM_FORMAT_XRGB2101010;
        case DISPPLANE_RGBX101010:
                return DRM_FORMAT_XBGR2101010;
        }
}

static bool intel_alloc_plane_obj(struct intel_crtc *crtc,
                                  struct intel_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_gem_object *obj = NULL;
        struct drm_mode_fb_cmd2 mode_cmd = { 0 };
        u32 base = plane_config->base;

        if (plane_config->size == 0)
                return false;

        obj = i915_gem_object_create_stolen_for_preallocated(dev, base, base,
                                                             plane_config->size);
        if (!obj)
                return false;

        if (plane_config->tiled) {
                obj->tiling_mode = I915_TILING_X;
                obj->stride = crtc->base.primary->fb->pitches[0];
        }

        mode_cmd.pixel_format = crtc->base.primary->fb->pixel_format;
        mode_cmd.width = crtc->base.primary->fb->width;
        mode_cmd.height = crtc->base.primary->fb->height;
        mode_cmd.pitches[0] = crtc->base.primary->fb->pitches[0];

        mutex_lock(&dev->struct_mutex);

        if (intel_framebuffer_init(dev, to_intel_framebuffer(crtc->base.primary->fb),
                                   &mode_cmd, obj)) {
                DRM_DEBUG_KMS("intel fb init failed\n");
                goto out_unref_obj;
        }

        mutex_unlock(&dev->struct_mutex);

        DRM_DEBUG_KMS("plane fb obj %p\n", obj);
        return true;

out_unref_obj:
        drm_gem_object_unreference(&obj->base);
        mutex_unlock(&dev->struct_mutex);
        return false;
}

static void intel_find_plane_obj(struct intel_crtc *intel_crtc,
                                 struct intel_plane_config *plane_config)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_crtc *c;
        struct intel_crtc *i;
        struct intel_framebuffer *fb;

        if (!intel_crtc->base.primary->fb)
                return;

        if (intel_alloc_plane_obj(intel_crtc, plane_config))
                return;

        kfree(intel_crtc->base.primary->fb);
        intel_crtc->base.primary->fb = NULL;

        /*
         * Failed to alloc the obj, check to see if we should share
         * an fb with another CRTC instead
         */
        for_each_crtc(dev, c) {
                i = to_intel_crtc(c);

                if (c == &intel_crtc->base)
                        continue;

                if (!i->active || !c->primary->fb)
                        continue;

                fb = to_intel_framebuffer(c->primary->fb);
                if (i915_gem_obj_ggtt_offset(fb->obj) == plane_config->base) {
                        drm_framebuffer_reference(c->primary->fb);
                        intel_crtc->base.primary->fb = c->primary->fb;
                        break;
                }
        }
}

static void i9xx_update_primary_plane(struct drm_crtc *crtc,
                                      struct drm_framebuffer *fb,
                                      int x, int y)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_framebuffer *intel_fb;
        struct drm_i915_gem_object *obj;
        int plane = intel_crtc->plane;
        unsigned long linear_offset;
        u32 dspcntr;
        u32 reg;

        intel_fb = to_intel_framebuffer(fb);
        obj = intel_fb->obj;

        reg = DSPCNTR(plane);
        dspcntr = I915_READ(reg);
        /* Mask out pixel format bits in case we change it */
        dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
        switch (fb->pixel_format) {
        case DRM_FORMAT_C8:
                dspcntr |= DISPPLANE_8BPP;
                break;
        case DRM_FORMAT_XRGB1555:
        case DRM_FORMAT_ARGB1555:
                dspcntr |= DISPPLANE_BGRX555;
                break;
        case DRM_FORMAT_RGB565:
                dspcntr |= DISPPLANE_BGRX565;
                break;
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                dspcntr |= DISPPLANE_BGRX888;
                break;
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ABGR8888:
                dspcntr |= DISPPLANE_RGBX888;
                break;
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_ARGB2101010:
                dspcntr |= DISPPLANE_BGRX101010;
                break;
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_ABGR2101010:
                dspcntr |= DISPPLANE_RGBX101010;
                break;
        default:
                BUG();
        }

        if (INTEL_INFO(dev)->gen >= 4) {
                if (obj->tiling_mode != I915_TILING_NONE)
                        dspcntr |= DISPPLANE_TILED;
                else
                        dspcntr &= ~DISPPLANE_TILED;
        }

        if (IS_G4X(dev))
                dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;

        I915_WRITE(reg, dspcntr);

        linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);

        if (INTEL_INFO(dev)->gen >= 4) {
                intel_crtc->dspaddr_offset =
                        intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
                                                       fb->bits_per_pixel / 8,
                                                       fb->pitches[0]);
                linear_offset -= intel_crtc->dspaddr_offset;
        } else {
                intel_crtc->dspaddr_offset = linear_offset;
        }

        DRM_DEBUG_KMS("Writing base %08lX %08lX %d %d %d\n",
                      i915_gem_obj_ggtt_offset(obj), linear_offset, x, y,
                      fb->pitches[0]);
        I915_WRITE(DSPSTRIDE(plane), fb->pitches[0]);
        if (INTEL_INFO(dev)->gen >= 4) {
                I915_WRITE(DSPSURF(plane),
                           i915_gem_obj_ggtt_offset(obj) + intel_crtc->dspaddr_offset);
                I915_WRITE(DSPTILEOFF(plane), (y << 16) | x);
                I915_WRITE(DSPLINOFF(plane), linear_offset);
        } else
                I915_WRITE(DSPADDR(plane), i915_gem_obj_ggtt_offset(obj) + linear_offset);
        POSTING_READ(reg);
}

static void ironlake_update_primary_plane(struct drm_crtc *crtc,
                                          struct drm_framebuffer *fb,
                                          int x, int y)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_framebuffer *intel_fb;
        struct drm_i915_gem_object *obj;
        int plane = intel_crtc->plane;
        unsigned long linear_offset;
        u32 dspcntr;
        u32 reg;

        intel_fb = to_intel_framebuffer(fb);
        obj = intel_fb->obj;

        reg = DSPCNTR(plane);
        dspcntr = I915_READ(reg);
        /* Mask out pixel format bits in case we change it */
        dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
        switch (fb->pixel_format) {
        case DRM_FORMAT_C8:
                dspcntr |= DISPPLANE_8BPP;
                break;
        case DRM_FORMAT_RGB565:
                dspcntr |= DISPPLANE_BGRX565;
                break;
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                dspcntr |= DISPPLANE_BGRX888;
                break;
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ABGR8888:
                dspcntr |= DISPPLANE_RGBX888;
                break;
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_ARGB2101010:
                dspcntr |= DISPPLANE_BGRX101010;
                break;
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_ABGR2101010:
                dspcntr |= DISPPLANE_RGBX101010;
                break;
        default:
                BUG();
        }

        if (obj->tiling_mode != I915_TILING_NONE)
                dspcntr |= DISPPLANE_TILED;
        else
                dspcntr &= ~DISPPLANE_TILED;

        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                dspcntr &= ~DISPPLANE_TRICKLE_FEED_DISABLE;
        else
                dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;

        I915_WRITE(reg, dspcntr);

        linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);
        intel_crtc->dspaddr_offset =
                intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
                                               fb->bits_per_pixel / 8,
                                               fb->pitches[0]);
        linear_offset -= intel_crtc->dspaddr_offset;

        DRM_DEBUG_KMS("Writing base %08lX %08lX %d %d %d\n",
                      i915_gem_obj_ggtt_offset(obj), linear_offset, x, y,
                      fb->pitches[0]);
        I915_WRITE(DSPSTRIDE(plane), fb->pitches[0]);
        I915_WRITE(DSPSURF(plane),
                   i915_gem_obj_ggtt_offset(obj) + intel_crtc->dspaddr_offset);
        if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
                I915_WRITE(DSPOFFSET(plane), (y << 16) | x);
        } else {
                I915_WRITE(DSPTILEOFF(plane), (y << 16) | x);
                I915_WRITE(DSPLINOFF(plane), linear_offset);
        }
        POSTING_READ(reg);
}

/* Assume fb object is pinned & idle & fenced and just update base pointers */
static int
intel_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb,
                           int x, int y, enum mode_set_atomic state)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (dev_priv->display.disable_fbc)
                dev_priv->display.disable_fbc(dev);
        intel_increase_pllclock(crtc);

        dev_priv->display.update_primary_plane(crtc, fb, x, y);

        return 0;
}

void intel_display_handle_reset(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_crtc *crtc;

        /*
         * Flips in the rings have been nuked by the reset,
         * so complete all pending flips so that user space
         * will get its events and not get stuck.
         *
         * Also update the base address of all primary
         * planes to the the last fb to make sure we're
         * showing the correct fb after a reset.
         *
         * Need to make two loops over the crtcs so that we
         * don't try to grab a crtc mutex before the
         * pending_flip_queue really got woken up.
         */

        for_each_crtc(dev, crtc) {
                struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
                enum plane plane = intel_crtc->plane;

                intel_prepare_page_flip(dev, plane);
                intel_finish_page_flip_plane(dev, plane);
        }

        for_each_crtc(dev, crtc) {
                struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

                drm_modeset_lock(&crtc->mutex, NULL);
                /*
                 * FIXME: Once we have proper support for primary planes (and
                 * disabling them without disabling the entire crtc) allow again
                 * a NULL crtc->primary->fb.
                 */
                if (intel_crtc->active && crtc->primary->fb)
                        dev_priv->display.update_primary_plane(crtc,
                                                               crtc->primary->fb,
                                                               crtc->x,
                                                               crtc->y);
                drm_modeset_unlock(&crtc->mutex);
        }
}

static int
intel_finish_fb(struct drm_framebuffer *old_fb)
{
        struct drm_i915_gem_object *obj = to_intel_framebuffer(old_fb)->obj;
        struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
        bool was_interruptible = dev_priv->mm.interruptible;
        int ret;

        /* Big Hammer, we also need to ensure that any pending
         * MI_WAIT_FOR_EVENT inside a user batch buffer on the
         * current scanout is retired before unpinning the old
         * framebuffer.
         *
         * This should only fail upon a hung GPU, in which case we
         * can safely continue.
         */
        dev_priv->mm.interruptible = false;
        ret = i915_gem_object_finish_gpu(obj);
        dev_priv->mm.interruptible = was_interruptible;

        return ret;
}

static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        unsigned long flags;
        bool pending;

        if (i915_reset_in_progress(&dev_priv->gpu_error) ||
            intel_crtc->reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter))
                return false;

        spin_lock_irqsave(&dev->event_lock, flags);
        pending = to_intel_crtc(crtc)->unpin_work != NULL;
        spin_unlock_irqrestore(&dev->event_lock, flags);

        return pending;
}

static int
intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
                    struct drm_framebuffer *fb)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_framebuffer *old_fb;
        int ret;

        if (intel_crtc_has_pending_flip(crtc)) {
                DRM_ERROR("pipe is still busy with an old pageflip\n");
                return -EBUSY;
        }

        /* no fb bound */
        if (!fb) {
                DRM_ERROR("No FB bound\n");
                return 0;
        }

        if (intel_crtc->plane > INTEL_INFO(dev)->num_pipes) {
                DRM_ERROR("no plane for crtc: plane %c, num_pipes %d\n",
                          plane_name(intel_crtc->plane),
                          INTEL_INFO(dev)->num_pipes);
                return -EINVAL;
        }

        mutex_lock(&dev->struct_mutex);
        ret = intel_pin_and_fence_fb_obj(dev,
                                         to_intel_framebuffer(fb)->obj,
                                         NULL);
        mutex_unlock(&dev->struct_mutex);
        if (ret != 0) {
                DRM_ERROR("pin & fence failed\n");
                return ret;
        }

        /*
         * Update pipe size and adjust fitter if needed: the reason for this is
         * that in compute_mode_changes we check the native mode (not the pfit
         * mode) to see if we can flip rather than do a full mode set. In the
         * fastboot case, we'll flip, but if we don't update the pipesrc and
         * pfit state, we'll end up with a big fb scanned out into the wrong
         * sized surface.
         *
         * To fix this properly, we need to hoist the checks up into
         * compute_mode_changes (or above), check the actual pfit state and
         * whether the platform allows pfit disable with pipe active, and only
         * then update the pipesrc and pfit state, even on the flip path.
         */
        if (i915.fastboot) {
                const struct drm_display_mode *adjusted_mode =
                        &intel_crtc->config.adjusted_mode;

                I915_WRITE(PIPESRC(intel_crtc->pipe),
                           ((adjusted_mode->crtc_hdisplay - 1) << 16) |
                           (adjusted_mode->crtc_vdisplay - 1));
                if (!intel_crtc->config.pch_pfit.enabled &&
                    (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) ||
                     intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))) {
                        I915_WRITE(PF_CTL(intel_crtc->pipe), 0);
                        I915_WRITE(PF_WIN_POS(intel_crtc->pipe), 0);
                        I915_WRITE(PF_WIN_SZ(intel_crtc->pipe), 0);
                }
                intel_crtc->config.pipe_src_w = adjusted_mode->crtc_hdisplay;
                intel_crtc->config.pipe_src_h = adjusted_mode->crtc_vdisplay;
        }

        dev_priv->display.update_primary_plane(crtc, fb, x, y);

        old_fb = crtc->primary->fb;
        crtc->primary->fb = fb;
        crtc->x = x;
        crtc->y = y;

        if (old_fb) {
                if (intel_crtc->active && old_fb != fb)
                        intel_wait_for_vblank(dev, intel_crtc->pipe);
                mutex_lock(&dev->struct_mutex);
                intel_unpin_fb_obj(to_intel_framebuffer(old_fb)->obj);
                mutex_unlock(&dev->struct_mutex);
        }

        mutex_lock(&dev->struct_mutex);
        intel_update_fbc(dev);
        intel_edp_psr_update(dev);
        mutex_unlock(&dev->struct_mutex);

        return 0;
}

static void intel_fdi_normal_train(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        u32 reg, temp;

        /* enable normal train */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        if (IS_IVYBRIDGE(dev)) {
                temp &= ~FDI_LINK_TRAIN_NONE_IVB;
                temp |= FDI_LINK_TRAIN_NONE_IVB | FDI_TX_ENHANCE_FRAME_ENABLE;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_NONE | FDI_TX_ENHANCE_FRAME_ENABLE;
        }
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_NORMAL_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_NONE;
        }
        I915_WRITE(reg, temp | FDI_RX_ENHANCE_FRAME_ENABLE);

        /* wait one idle pattern time */
        POSTING_READ(reg);
        udelay(1000);

        /* IVB wants error correction enabled */
        if (IS_IVYBRIDGE(dev))
                I915_WRITE(reg, I915_READ(reg) | FDI_FS_ERRC_ENABLE |
                           FDI_FE_ERRC_ENABLE);
}

static bool pipe_has_enabled_pch(struct intel_crtc *crtc)
{
        return crtc->base.enabled && crtc->active &&
                crtc->config.has_pch_encoder;
}

static void ivb_modeset_global_resources(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *pipe_B_crtc =
                to_intel_crtc(dev_priv->pipe_to_crtc_mapping[PIPE_B]);
        struct intel_crtc *pipe_C_crtc =
                to_intel_crtc(dev_priv->pipe_to_crtc_mapping[PIPE_C]);
        uint32_t temp;

        /*
         * When everything is off disable fdi C so that we could enable fdi B
         * with all lanes. Note that we don't care about enabled pipes without
         * an enabled pch encoder.
         */
        if (!pipe_has_enabled_pch(pipe_B_crtc) &&
            !pipe_has_enabled_pch(pipe_C_crtc)) {
                WARN_ON(I915_READ(FDI_RX_CTL(PIPE_B)) & FDI_RX_ENABLE);
                WARN_ON(I915_READ(FDI_RX_CTL(PIPE_C)) & FDI_RX_ENABLE);

                temp = I915_READ(SOUTH_CHICKEN1);
                temp &= ~FDI_BC_BIFURCATION_SELECT;
                DRM_DEBUG_KMS("disabling fdi C rx\n");
                I915_WRITE(SOUTH_CHICKEN1, temp);
        }
}

/* The FDI link training functions for ILK/Ibexpeak. */
static void ironlake_fdi_link_train(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        u32 reg, temp, tries;

        /* FDI needs bits from pipe first */
        assert_pipe_enabled(dev_priv, pipe);

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        I915_WRITE(reg, temp);
        I915_READ(reg);
        udelay(150);

        /* enable CPU FDI TX and PCH FDI RX */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_DP_PORT_WIDTH_MASK;
        temp |= FDI_DP_PORT_WIDTH(intel_crtc->config.fdi_lanes);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        I915_WRITE(reg, temp | FDI_TX_ENABLE);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        I915_WRITE(reg, temp | FDI_RX_ENABLE);

        POSTING_READ(reg);
        udelay(150);

        /* Ironlake workaround, enable clock pointer after FDI enable*/
        I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);
        I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR |
                   FDI_RX_PHASE_SYNC_POINTER_EN);

        reg = FDI_RX_IIR(pipe);
        for (tries = 0; tries < 5; tries++) {
                temp = I915_READ(reg);
                DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                if ((temp & FDI_RX_BIT_LOCK)) {
                        DRM_DEBUG_KMS("FDI train 1 done.\n");
                        I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
                        break;
                }
        }
        if (tries == 5)
                DRM_ERROR("FDI train 1 fail!\n");

        /* Train 2 */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        reg = FDI_RX_IIR(pipe);
        for (tries = 0; tries < 5; tries++) {
                temp = I915_READ(reg);
                DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                if (temp & FDI_RX_SYMBOL_LOCK) {
                        I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
                        DRM_DEBUG_KMS("FDI train 2 done.\n");
                        break;
                }
        }
        if (tries == 5)
                DRM_ERROR("FDI train 2 fail!\n");

        DRM_DEBUG_KMS("FDI train done\n");

}

static const int snb_b_fdi_train_param[] = {
        FDI_LINK_TRAIN_400MV_0DB_SNB_B,
        FDI_LINK_TRAIN_400MV_6DB_SNB_B,
        FDI_LINK_TRAIN_600MV_3_5DB_SNB_B,
        FDI_LINK_TRAIN_800MV_0DB_SNB_B,
};

/* The FDI link training functions for SNB/Cougarpoint. */
static void gen6_fdi_link_train(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        u32 reg, temp, i, retry;

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        /* enable CPU FDI TX and PCH FDI RX */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_DP_PORT_WIDTH_MASK;
        temp |= FDI_DP_PORT_WIDTH(intel_crtc->config.fdi_lanes);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
        /* SNB-B */
        temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
        I915_WRITE(reg, temp | FDI_TX_ENABLE);

        I915_WRITE(FDI_RX_MISC(pipe),
                   FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_1;
        }
        I915_WRITE(reg, temp | FDI_RX_ENABLE);

        POSTING_READ(reg);
        udelay(150);

        for (i = 0; i < 4; i++) {
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[i];
                I915_WRITE(reg, temp);

                POSTING_READ(reg);
                udelay(500);

                for (retry = 0; retry < 5; retry++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);
                        if (temp & FDI_RX_BIT_LOCK) {
                                I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
                                DRM_DEBUG_KMS("FDI train 1 done.\n");
                                break;
                        }
                        udelay(50);
                }
                if (retry < 5)
                        break;
        }
        if (i == 4)
                DRM_ERROR("FDI train 1 fail!\n");

        /* Train 2 */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        if (IS_GEN6(dev)) {
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                /* SNB-B */
                temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
        }
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_2;
        }
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        for (i = 0; i < 4; i++) {
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[i];
                I915_WRITE(reg, temp);

                POSTING_READ(reg);
                udelay(500);

                for (retry = 0; retry < 5; retry++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);
                        if (temp & FDI_RX_SYMBOL_LOCK) {
                                I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
                                DRM_DEBUG_KMS("FDI train 2 done.\n");
                                break;
                        }
                        udelay(50);
                }
                if (retry < 5)
                        break;
        }
        if (i == 4)
                DRM_ERROR("FDI train 2 fail!\n");

        DRM_DEBUG_KMS("FDI train done.\n");
}

/* Manual link training for Ivy Bridge A0 parts */
static void ivb_manual_fdi_link_train(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        u32 reg, temp, i, j;

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        DRM_DEBUG_KMS("FDI_RX_IIR before link train 0x%x\n",
                      I915_READ(FDI_RX_IIR(pipe)));

        /* Try each vswing and preemphasis setting twice before moving on */
        for (j = 0; j < ARRAY_SIZE(snb_b_fdi_train_param) * 2; j++) {
                /* disable first in case we need to retry */
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~(FDI_LINK_TRAIN_AUTO | FDI_LINK_TRAIN_NONE_IVB);
                temp &= ~FDI_TX_ENABLE;
                I915_WRITE(reg, temp);

                reg = FDI_RX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_AUTO;
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp &= ~FDI_RX_ENABLE;
                I915_WRITE(reg, temp);

                /* enable CPU FDI TX and PCH FDI RX */
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_DP_PORT_WIDTH_MASK;
                temp |= FDI_DP_PORT_WIDTH(intel_crtc->config.fdi_lanes);
                temp |= FDI_LINK_TRAIN_PATTERN_1_IVB;
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[j/2];
                temp |= FDI_COMPOSITE_SYNC;
                I915_WRITE(reg, temp | FDI_TX_ENABLE);

                I915_WRITE(FDI_RX_MISC(pipe),
                           FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

                reg = FDI_RX_CTL(pipe);
                temp = I915_READ(reg);
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
                temp |= FDI_COMPOSITE_SYNC;
                I915_WRITE(reg, temp | FDI_RX_ENABLE);

                POSTING_READ(reg);
                udelay(1); /* should be 0.5us */

                for (i = 0; i < 4; i++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                        if (temp & FDI_RX_BIT_LOCK ||
                            (I915_READ(reg) & FDI_RX_BIT_LOCK)) {
                                I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
                                DRM_DEBUG_KMS("FDI train 1 done, level %i.\n",
                                              i);
                                break;
                        }
                        udelay(1); /* should be 0.5us */
                }
                if (i == 4) {
                        DRM_DEBUG_KMS("FDI train 1 fail on vswing %d\n", j / 2);
                        continue;
                }

                /* Train 2 */
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_NONE_IVB;
                temp |= FDI_LINK_TRAIN_PATTERN_2_IVB;
                I915_WRITE(reg, temp);

                reg = FDI_RX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
                I915_WRITE(reg, temp);

                POSTING_READ(reg);
                udelay(2); /* should be 1.5us */

                for (i = 0; i < 4; i++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                        if (temp & FDI_RX_SYMBOL_LOCK ||
                            (I915_READ(reg) & FDI_RX_SYMBOL_LOCK)) {
                                I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
                                DRM_DEBUG_KMS("FDI train 2 done, level %i.\n",
                                              i);
                                goto train_done;
                        }
                        udelay(2); /* should be 1.5us */
                }
                if (i == 4)
                        DRM_DEBUG_KMS("FDI train 2 fail on vswing %d\n", j / 2);
        }

train_done:
        DRM_DEBUG_KMS("FDI train done.\n");
}

static void ironlake_fdi_pll_enable(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = intel_crtc->pipe;
        u32 reg, temp;


        /* enable PCH FDI RX PLL, wait warmup plus DMI latency */
        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~(FDI_DP_PORT_WIDTH_MASK | (0x7 << 16));
        temp |= FDI_DP_PORT_WIDTH(intel_crtc->config.fdi_lanes);
        temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        I915_WRITE(reg, temp | FDI_RX_PLL_ENABLE);

        POSTING_READ(reg);
        udelay(200);

        /* Switch from Rawclk to PCDclk */
        temp = I915_READ(reg);
        I915_WRITE(reg, temp | FDI_PCDCLK);

        POSTING_READ(reg);
        udelay(200);

        /* Enable CPU FDI TX PLL, always on for Ironlake */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        if ((temp & FDI_TX_PLL_ENABLE) == 0) {
                I915_WRITE(reg, temp | FDI_TX_PLL_ENABLE);

                POSTING_READ(reg);
                udelay(100);
        }
}

static void ironlake_fdi_pll_disable(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = intel_crtc->pipe;
        u32 reg, temp;

        /* Switch from PCDclk to Rawclk */
        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_PCDCLK);

        /* Disable CPU FDI TX PLL */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_TX_PLL_ENABLE);

        POSTING_READ(reg);
        udelay(100);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_RX_PLL_ENABLE);

        /* Wait for the clocks to turn off. */
        POSTING_READ(reg);
        udelay(100);
}

static void ironlake_fdi_disable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        u32 reg, temp;

        /* disable CPU FDI tx and PCH FDI rx */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_TX_ENABLE);
        POSTING_READ(reg);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~(0x7 << 16);
        temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        I915_WRITE(reg, temp & ~FDI_RX_ENABLE);

        POSTING_READ(reg);
        udelay(100);

        /* Ironlake workaround, disable clock pointer after downing FDI */
        if (HAS_PCH_IBX(dev))
                I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);

        /* still set train pattern 1 */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_1;
        }
        /* BPC in FDI rx is consistent with that in PIPECONF */
        temp &= ~(0x07 << 16);
        temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(100);
}

bool intel_has_pending_fb_unpin(struct drm_device *dev)
{
        struct intel_crtc *crtc;

        /* Note that we don't need to be called with mode_config.lock here
         * as our list of CRTC objects is static for the lifetime of the
         * device and so cannot disappear as we iterate. Similarly, we can
         * happily treat the predicates as racy, atomic checks as userspace
         * cannot claim and pin a new fb without at least acquring the
         * struct_mutex and so serialising with us.
         */
        for_each_intel_crtc(dev, crtc) {
                if (atomic_read(&crtc->unpin_work_count) == 0)
                        continue;

                if (crtc->unpin_work)
                        intel_wait_for_vblank(dev, crtc->pipe);

                return true;
        }

        return false;
}

void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (crtc->primary->fb == NULL)
                return;

        WARN_ON(waitqueue_active(&dev_priv->pending_flip_queue));

        WARN_ON(wait_event_timeout(dev_priv->pending_flip_queue,
                                   !intel_crtc_has_pending_flip(crtc),
                                   60*HZ) == 0);

        mutex_lock(&dev->struct_mutex);
        intel_finish_fb(crtc->primary->fb);
        mutex_unlock(&dev->struct_mutex);
}

/* Program iCLKIP clock to the desired frequency */
static void lpt_program_iclkip(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int clock = to_intel_crtc(crtc)->config.adjusted_mode.crtc_clock;
        u32 divsel, phaseinc, auxdiv, phasedir = 0;
        u32 temp;

        mutex_lock(&dev_priv->dpio_lock);

        /* It is necessary to ungate the pixclk gate prior to programming
         * the divisors, and gate it back when it is done.
         */
        I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_GATE);

        /* Disable SSCCTL */
        intel_sbi_write(dev_priv, SBI_SSCCTL6,
                        intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK) |
                                SBI_SSCCTL_DISABLE,
                        SBI_ICLK);

        /* 20MHz is a corner case which is out of range for the 7-bit divisor */
        if (clock == 20000) {
                auxdiv = 1;
                divsel = 0x41;
                phaseinc = 0x20;
        } else {
                /* The iCLK virtual clock root frequency is in MHz,
                 * but the adjusted_mode->crtc_clock in in KHz. To get the
                 * divisors, it is necessary to divide one by another, so we
                 * convert the virtual clock precision to KHz here for higher
                 * precision.
                 */
                u32 iclk_virtual_root_freq = 172800 * 1000;
                u32 iclk_pi_range = 64;
                u32 desired_divisor, msb_divisor_value, pi_value;

                desired_divisor = (iclk_virtual_root_freq / clock);
                msb_divisor_value = desired_divisor / iclk_pi_range;
                pi_value = desired_divisor % iclk_pi_range;

                auxdiv = 0;
                divsel = msb_divisor_value - 2;
                phaseinc = pi_value;
        }

        /* This should not happen with any sane values */
        WARN_ON(SBI_SSCDIVINTPHASE_DIVSEL(divsel) &
                ~SBI_SSCDIVINTPHASE_DIVSEL_MASK);
        WARN_ON(SBI_SSCDIVINTPHASE_DIR(phasedir) &
                ~SBI_SSCDIVINTPHASE_INCVAL_MASK);

        DRM_DEBUG_KMS("iCLKIP clock: found settings for %dKHz refresh rate: auxdiv=%x, divsel=%x, phasedir=%x, phaseinc=%x\n",
                        clock,
                        auxdiv,
                        divsel,
                        phasedir,
                        phaseinc);

        /* Program SSCDIVINTPHASE6 */
        temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
        temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
        temp |= SBI_SSCDIVINTPHASE_DIVSEL(divsel);
        temp &= ~SBI_SSCDIVINTPHASE_INCVAL_MASK;
        temp |= SBI_SSCDIVINTPHASE_INCVAL(phaseinc);
        temp |= SBI_SSCDIVINTPHASE_DIR(phasedir);
        temp |= SBI_SSCDIVINTPHASE_PROPAGATE;
        intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE6, temp, SBI_ICLK);

        /* Program SSCAUXDIV */
        temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
        temp &= ~SBI_SSCAUXDIV_FINALDIV2SEL(1);
        temp |= SBI_SSCAUXDIV_FINALDIV2SEL(auxdiv);
        intel_sbi_write(dev_priv, SBI_SSCAUXDIV6, temp, SBI_ICLK);

        /* Enable modulator and associated divider */
        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        temp &= ~SBI_SSCCTL_DISABLE;
        intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

        /* Wait for initialization time */
        udelay(24);

        I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_UNGATE);

        mutex_unlock(&dev_priv->dpio_lock);
}

static void ironlake_pch_transcoder_set_timings(struct intel_crtc *crtc,
                                                enum pipe pch_transcoder)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum transcoder cpu_transcoder = crtc->config.cpu_transcoder;

        I915_WRITE(PCH_TRANS_HTOTAL(pch_transcoder),
                   I915_READ(HTOTAL(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_HBLANK(pch_transcoder),
                   I915_READ(HBLANK(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_HSYNC(pch_transcoder),
                   I915_READ(HSYNC(cpu_transcoder)));

        I915_WRITE(PCH_TRANS_VTOTAL(pch_transcoder),
                   I915_READ(VTOTAL(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_VBLANK(pch_transcoder),
                   I915_READ(VBLANK(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_VSYNC(pch_transcoder),
                   I915_READ(VSYNC(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_VSYNCSHIFT(pch_transcoder),
                   I915_READ(VSYNCSHIFT(cpu_transcoder)));
}

static void cpt_enable_fdi_bc_bifurcation(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t temp;

        temp = I915_READ(SOUTH_CHICKEN1);
        if (temp & FDI_BC_BIFURCATION_SELECT)
                return;

        WARN_ON(I915_READ(FDI_RX_CTL(PIPE_B)) & FDI_RX_ENABLE);
        WARN_ON(I915_READ(FDI_RX_CTL(PIPE_C)) & FDI_RX_ENABLE);

        temp |= FDI_BC_BIFURCATION_SELECT;
        DRM_DEBUG_KMS("enabling fdi C rx\n");
        I915_WRITE(SOUTH_CHICKEN1, temp);
        POSTING_READ(SOUTH_CHICKEN1);
}

static void ivybridge_update_fdi_bc_bifurcation(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        switch (intel_crtc->pipe) {
        case PIPE_A:
                break;
        case PIPE_B:
                if (intel_crtc->config.fdi_lanes > 2)
                        WARN_ON(I915_READ(SOUTH_CHICKEN1) & FDI_BC_BIFURCATION_SELECT);
                else
                        cpt_enable_fdi_bc_bifurcation(dev);

                break;
        case PIPE_C:
                cpt_enable_fdi_bc_bifurcation(dev);

                break;
        default:
                BUG();
        }
}

/*
 * Enable PCH resources required for PCH ports:
 *   - PCH PLLs
 *   - FDI training & RX/TX
 *   - update transcoder timings
 *   - DP transcoding bits
 *   - transcoder
 */
static void ironlake_pch_enable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        u32 reg, temp;

        assert_pch_transcoder_disabled(dev_priv, pipe);

        if (IS_IVYBRIDGE(dev))
                ivybridge_update_fdi_bc_bifurcation(intel_crtc);

        /* Write the TU size bits before fdi link training, so that error
         * detection works. */
        I915_WRITE(FDI_RX_TUSIZE1(pipe),
                   I915_READ(PIPE_DATA_M1(pipe)) & TU_SIZE_MASK);

        /* For PCH output, training FDI link */
        dev_priv->display.fdi_link_train(crtc);

        /* We need to program the right clock selection before writing the pixel
         * mutliplier into the DPLL. */
        if (HAS_PCH_CPT(dev)) {
                u32 sel;

                temp = I915_READ(PCH_DPLL_SEL);
                temp |= TRANS_DPLL_ENABLE(pipe);
                sel = TRANS_DPLLB_SEL(pipe);
                if (intel_crtc->config.shared_dpll == DPLL_ID_PCH_PLL_B)
                        temp |= sel;
                else
                        temp &= ~sel;
                I915_WRITE(PCH_DPLL_SEL, temp);
        }

        /* XXX: pch pll's can be enabled any time before we enable the PCH
         * transcoder, and we actually should do this to not upset any PCH
         * transcoder that already use the clock when we share it.
         *
         * Note that enable_shared_dpll tries to do the right thing, but
         * get_shared_dpll unconditionally resets the pll - we need that to have
         * the right LVDS enable sequence. */
        intel_enable_shared_dpll(intel_crtc);

        /* set transcoder timing, panel must allow it */
        assert_panel_unlocked(dev_priv, pipe);
        ironlake_pch_transcoder_set_timings(intel_crtc, pipe);

        intel_fdi_normal_train(crtc);

        /* For PCH DP, enable TRANS_DP_CTL */
        if (HAS_PCH_CPT(dev) &&
            (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
             intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))) {
                u32 bpc = (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) >> 5;
                reg = TRANS_DP_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~(TRANS_DP_PORT_SEL_MASK |
                          TRANS_DP_SYNC_MASK |
                          TRANS_DP_BPC_MASK);
                temp |= (TRANS_DP_OUTPUT_ENABLE |
                         TRANS_DP_ENH_FRAMING);
                temp |= bpc << 9; /* same format but at 11:9 */

                if (crtc->mode.flags & DRM_MODE_FLAG_PHSYNC)
                        temp |= TRANS_DP_HSYNC_ACTIVE_HIGH;
                if (crtc->mode.flags & DRM_MODE_FLAG_PVSYNC)
                        temp |= TRANS_DP_VSYNC_ACTIVE_HIGH;

                switch (intel_trans_dp_port_sel(crtc)) {
                case PCH_DP_B:
                        temp |= TRANS_DP_PORT_SEL_B;
                        break;
                case PCH_DP_C:
                        temp |= TRANS_DP_PORT_SEL_C;
                        break;
                case PCH_DP_D:
                        temp |= TRANS_DP_PORT_SEL_D;
                        break;
                default:
                        BUG();
                }

                I915_WRITE(reg, temp);
        }

        ironlake_enable_pch_transcoder(dev_priv, pipe);
}

static void lpt_pch_enable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;

        assert_pch_transcoder_disabled(dev_priv, TRANSCODER_A);

        lpt_program_iclkip(crtc);

        /* Set transcoder timing. */
        ironlake_pch_transcoder_set_timings(intel_crtc, PIPE_A);

        lpt_enable_pch_transcoder(dev_priv, cpu_transcoder);
}

static void intel_put_shared_dpll(struct intel_crtc *crtc)
{
        struct intel_shared_dpll *pll = intel_crtc_to_shared_dpll(crtc);

        if (pll == NULL)
                return;

        if (pll->refcount == 0) {
                WARN(1, "bad %s refcount\n", pll->name);
                return;
        }

        if (--pll->refcount == 0) {
                WARN_ON(pll->on);
                WARN_ON(pll->active);
        }

        crtc->config.shared_dpll = DPLL_ID_PRIVATE;
}

static struct intel_shared_dpll *intel_get_shared_dpll(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
        struct intel_shared_dpll *pll = intel_crtc_to_shared_dpll(crtc);
        enum intel_dpll_id i;

        if (pll) {
                DRM_DEBUG_KMS("CRTC:%d dropping existing %s\n",
                              crtc->base.base.id, pll->name);
                intel_put_shared_dpll(crtc);
        }

        if (HAS_PCH_IBX(dev_priv->dev)) {
                /* Ironlake PCH has a fixed PLL->PCH pipe mapping. */
                i = (enum intel_dpll_id) crtc->pipe;
                pll = &dev_priv->shared_dplls[i];

                DRM_DEBUG_KMS("CRTC:%d using pre-allocated %s\n",
                              crtc->base.base.id, pll->name);

                WARN_ON(pll->refcount);

                goto found;
        }

        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                pll = &dev_priv->shared_dplls[i];

                /* Only want to check enabled timings first */
                if (pll->refcount == 0)
                        continue;

                if (memcmp(&crtc->config.dpll_hw_state, &pll->hw_state,
                           sizeof(pll->hw_state)) == 0) {
                        DRM_DEBUG_KMS("CRTC:%d sharing existing %s (refcount %d, ative %d)\n",
                                      crtc->base.base.id,
                                      pll->name, pll->refcount, pll->active);

                        goto found;
                }
        }

        /* Ok no matching timings, maybe there's a free one? */
        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                pll = &dev_priv->shared_dplls[i];
                if (pll->refcount == 0) {
                        DRM_DEBUG_KMS("CRTC:%d allocated %s\n",
                                      crtc->base.base.id, pll->name);
                        goto found;
                }
        }

        return NULL;

found:
        if (pll->refcount == 0)
                pll->hw_state = crtc->config.dpll_hw_state;

        crtc->config.shared_dpll = i;
        DRM_DEBUG_DRIVER("using %s for pipe %c\n", pll->name,
                         pipe_name(crtc->pipe));

        pll->refcount++;

        return pll;
}

static void cpt_verify_modeset(struct drm_device *dev, int pipe)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        int dslreg = PIPEDSL(pipe);
        u32 temp;

        temp = I915_READ(dslreg);
        udelay(500);
        if (wait_for(I915_READ(dslreg) != temp, 5)) {
                if (wait_for(I915_READ(dslreg) != temp, 5))
                        DRM_ERROR("mode set failed: pipe %c stuck\n", pipe_name(pipe));
        }
}

static void ironlake_pfit_enable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = crtc->pipe;

        if (crtc->config.pch_pfit.enabled) {
                /* Force use of hard-coded filter coefficients
                 * as some pre-programmed values are broken,
                 * e.g. x201.
                 */
                if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
                        I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3 |
                                                 PF_PIPE_SEL_IVB(pipe));
                else
                        I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3);
                I915_WRITE(PF_WIN_POS(pipe), crtc->config.pch_pfit.pos);
                I915_WRITE(PF_WIN_SZ(pipe), crtc->config.pch_pfit.size);
        }
}

static void intel_enable_planes(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        struct drm_plane *plane;
        struct intel_plane *intel_plane;

        drm_for_each_legacy_plane(plane, &dev->mode_config.plane_list) {
                intel_plane = to_intel_plane(plane);
                if (intel_plane->pipe == pipe)
                        intel_plane_restore(&intel_plane->base);
        }
}

static void intel_disable_planes(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        enum pipe pipe = to_intel_crtc(crtc)->pipe;
        struct drm_plane *plane;
        struct intel_plane *intel_plane;

        drm_for_each_legacy_plane(plane, &dev->mode_config.plane_list) {
                intel_plane = to_intel_plane(plane);
                if (intel_plane->pipe == pipe)
                        intel_plane_disable(&intel_plane->base);
        }
}

void hsw_enable_ips(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (!crtc->config.ips_enabled)
                return;

        /* We can only enable IPS after we enable a plane and wait for a vblank */
        intel_wait_for_vblank(dev, crtc->pipe);

        assert_plane_enabled(dev_priv, crtc->plane);
        if (IS_BROADWELL(dev)) {
                mutex_lock(&dev_priv->rps.hw_lock);
                WARN_ON(sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0xc0000000));
                mutex_unlock(&dev_priv->rps.hw_lock);
                /* Quoting Art Runyan: "its not safe to expect any particular
                 * value in IPS_CTL bit 31 after enabling IPS through the
                 * mailbox." Moreover, the mailbox may return a bogus state,
                 * so we need to just enable it and continue on.
                 */
        } else {
                I915_WRITE(IPS_CTL, IPS_ENABLE);
                /* The bit only becomes 1 in the next vblank, so this wait here
                 * is essentially intel_wait_for_vblank. If we don't have this
                 * and don't wait for vblanks until the end of crtc_enable, then
                 * the HW state readout code will complain that the expected
                 * IPS_CTL value is not the one we read. */
                if (wait_for(I915_READ_NOTRACE(IPS_CTL) & IPS_ENABLE, 50))
                        DRM_ERROR("Timed out waiting for IPS enable\n");
        }
}

void hsw_disable_ips(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (!crtc->config.ips_enabled)
                return;

        assert_plane_enabled(dev_priv, crtc->plane);
        if (IS_BROADWELL(dev)) {
                mutex_lock(&dev_priv->rps.hw_lock);
                WARN_ON(sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0));
                mutex_unlock(&dev_priv->rps.hw_lock);
                /* wait for pcode to finish disabling IPS, which may take up to 42ms */
                if (wait_for((I915_READ(IPS_CTL) & IPS_ENABLE) == 0, 42))
                        DRM_ERROR("Timed out waiting for IPS disable\n");
        } else {
                I915_WRITE(IPS_CTL, 0);
                POSTING_READ(IPS_CTL);
        }

        /* We need to wait for a vblank before we can disable the plane. */
        intel_wait_for_vblank(dev, crtc->pipe);
}

/** Loads the palette/gamma unit for the CRTC with the prepared values */
static void intel_crtc_load_lut(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum pipe pipe = intel_crtc->pipe;
        int palreg = PALETTE(pipe);
        int i;
        bool reenable_ips = false;

        /* The clocks have to be on to load the palette. */
        if (!crtc->enabled || !intel_crtc->active)
                return;

        if (!HAS_PCH_SPLIT(dev_priv->dev)) {
                if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI))
                        assert_dsi_pll_enabled(dev_priv);
                else
                        assert_pll_enabled(dev_priv, pipe);
        }

        /* use legacy palette for Ironlake */
        if (HAS_PCH_SPLIT(dev))
                palreg = LGC_PALETTE(pipe);

        /* Workaround : Do not read or write the pipe palette/gamma data while
         * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
         */
        if (IS_HASWELL(dev) && intel_crtc->config.ips_enabled &&
            ((I915_READ(GAMMA_MODE(pipe)) & GAMMA_MODE_MODE_MASK) ==
             GAMMA_MODE_MODE_SPLIT)) {
                hsw_disable_ips(intel_crtc);
                reenable_ips = true;
        }

        for (i = 0; i < 256; i++) {
                I915_WRITE(palreg + 4 * i,
                           (intel_crtc->lut_r[i] << 16) |
                           (intel_crtc->lut_g[i] << 8) |
                           intel_crtc->lut_b[i]);
        }

        if (reenable_ips)
                hsw_enable_ips(intel_crtc);
}

static void intel_crtc_dpms_overlay(struct intel_crtc *intel_crtc, bool enable)
{
        if (!enable && intel_crtc->overlay) {
                struct drm_device *dev = intel_crtc->base.dev;
                struct drm_i915_private *dev_priv = dev->dev_private;

                mutex_lock(&dev->struct_mutex);
                dev_priv->mm.interruptible = false;
                (void) intel_overlay_switch_off(intel_crtc->overlay);
                dev_priv->mm.interruptible = true;
                mutex_unlock(&dev->struct_mutex);
        }

        /* Let userspace switch the overlay on again. In most cases userspace
         * has to recompute where to put it anyway.
         */
}

/**
 * i9xx_fixup_plane - ugly workaround for G45 to fire up the hardware
 * cursor plane briefly if not already running after enabling the display
 * plane.
 * This workaround avoids occasional blank screens when self refresh is
 * enabled.
 */
static void
g4x_fixup_plane(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        u32 cntl = I915_READ(CURCNTR(pipe));

        if ((cntl & CURSOR_MODE) == 0) {
                u32 fw_bcl_self = I915_READ(FW_BLC_SELF);

                I915_WRITE(FW_BLC_SELF, fw_bcl_self & ~FW_BLC_SELF_EN);
                I915_WRITE(CURCNTR(pipe), CURSOR_MODE_64_ARGB_AX);
                intel_wait_for_vblank(dev_priv->dev, pipe);
                I915_WRITE(CURCNTR(pipe), cntl);
                I915_WRITE(CURBASE(pipe), I915_READ(CURBASE(pipe)));
                I915_WRITE(FW_BLC_SELF, fw_bcl_self);
        }
}

static void intel_crtc_enable_planes(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        int plane = intel_crtc->plane;

        intel_enable_primary_hw_plane(dev_priv, plane, pipe);
        intel_enable_planes(crtc);
        /* The fixup needs to happen before cursor is enabled */
        if (IS_G4X(dev))
                g4x_fixup_plane(dev_priv, pipe);
        intel_crtc_update_cursor(crtc, true);
        intel_crtc_dpms_overlay(intel_crtc, true);

        hsw_enable_ips(intel_crtc);

        mutex_lock(&dev->struct_mutex);
        intel_update_fbc(dev);
        intel_edp_psr_update(dev);
        mutex_unlock(&dev->struct_mutex);
}

static void intel_crtc_disable_planes(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        int plane = intel_crtc->plane;

        intel_crtc_wait_for_pending_flips(crtc);
        drm_crtc_vblank_off(crtc);

        if (dev_priv->fbc.plane == plane)
                intel_disable_fbc(dev);

        hsw_disable_ips(intel_crtc);

        intel_crtc_dpms_overlay(intel_crtc, false);
        intel_crtc_update_cursor(crtc, false);
        intel_disable_planes(crtc);
        intel_disable_primary_hw_plane(dev_priv, plane, pipe);
}

static void ironlake_crtc_enable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
        enum plane plane = intel_crtc->plane;

        WARN_ON(!crtc->enabled);

        if (intel_crtc->active)
                return;

        if (intel_crtc->config.has_pch_encoder)
                intel_prepare_shared_dpll(intel_crtc);

        if (intel_crtc->config.has_dp_encoder)
                intel_dp_set_m_n(intel_crtc);

        intel_set_pipe_timings(intel_crtc);

        if (intel_crtc->config.has_pch_encoder) {
                intel_cpu_transcoder_set_m_n(intel_crtc,
                                             &intel_crtc->config.fdi_m_n);
        }

        ironlake_set_pipeconf(crtc);

        /* Set up the display plane register */
        I915_WRITE(DSPCNTR(plane), DISPPLANE_GAMMA_ENABLE);
        POSTING_READ(DSPCNTR(plane));

        dev_priv->display.update_primary_plane(crtc, crtc->primary->fb,
                                               crtc->x, crtc->y);

        intel_crtc->active = true;

        intel_set_cpu_fifo_underrun_reporting(dev, pipe, true);
        intel_set_pch_fifo_underrun_reporting(dev, pipe, true);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->pre_enable)
                        encoder->pre_enable(encoder);

        if (intel_crtc->config.has_pch_encoder) {
                /* Note: FDI PLL enabling _must_ be done before we enable the
                 * cpu pipes, hence this is separate from all the other fdi/pch
                 * enabling. */
                ironlake_fdi_pll_enable(intel_crtc);
        } else {
                assert_fdi_tx_disabled(dev_priv, pipe);
                assert_fdi_rx_disabled(dev_priv, pipe);
        }

        ironlake_pfit_enable(intel_crtc);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_crtc_load_lut(crtc);

        intel_update_watermarks(crtc);
        intel_enable_pipe(intel_crtc);

        if (intel_crtc->config.has_pch_encoder)
                ironlake_pch_enable(crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                encoder->enable(encoder);

        if (HAS_PCH_CPT(dev))
                cpt_verify_modeset(dev, intel_crtc->pipe);

        intel_crtc_enable_planes(crtc);

        drm_crtc_vblank_on(crtc);
}

/* IPS only exists on ULT machines and is tied to pipe A. */
static bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
{
        return HAS_IPS(crtc->base.dev) && crtc->pipe == PIPE_A;
}

/*
 * This implements the workaround described in the "notes" section of the mode
 * set sequence documentation. When going from no pipes or single pipe to
 * multiple pipes, and planes are enabled after the pipe, we need to wait at
 * least 2 vblanks on the first pipe before enabling planes on the second pipe.
 */
static void haswell_mode_set_planes_workaround(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_crtc *crtc_it, *other_active_crtc = NULL;

        /* We want to get the other_active_crtc only if there's only 1 other
         * active crtc. */
        for_each_intel_crtc(dev, crtc_it) {
                if (!crtc_it->active || crtc_it == crtc)
                        continue;

                if (other_active_crtc)
                        return;

                other_active_crtc = crtc_it;
        }
        if (!other_active_crtc)
                return;

        intel_wait_for_vblank(dev, other_active_crtc->pipe);
        intel_wait_for_vblank(dev, other_active_crtc->pipe);
}

static void haswell_crtc_enable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
        enum plane plane = intel_crtc->plane;

        WARN_ON(!crtc->enabled);

        if (intel_crtc->active)
                return;

        if (intel_crtc->config.has_dp_encoder)
                intel_dp_set_m_n(intel_crtc);

        intel_set_pipe_timings(intel_crtc);

        if (intel_crtc->config.has_pch_encoder) {
                intel_cpu_transcoder_set_m_n(intel_crtc,
                                             &intel_crtc->config.fdi_m_n);
        }

        haswell_set_pipeconf(crtc);

        intel_set_pipe_csc(crtc);

        /* Set up the display plane register */
        I915_WRITE(DSPCNTR(plane), DISPPLANE_GAMMA_ENABLE | DISPPLANE_PIPE_CSC_ENABLE);
        POSTING_READ(DSPCNTR(plane));

        dev_priv->display.update_primary_plane(crtc, crtc->primary->fb,
                                               crtc->x, crtc->y);

        intel_crtc->active = true;

        intel_set_cpu_fifo_underrun_reporting(dev, pipe, true);
        if (intel_crtc->config.has_pch_encoder)
                intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A, true);

        if (intel_crtc->config.has_pch_encoder)
                dev_priv->display.fdi_link_train(crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->pre_enable)
                        encoder->pre_enable(encoder);

        intel_ddi_enable_pipe_clock(intel_crtc);

        ironlake_pfit_enable(intel_crtc);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_crtc_load_lut(crtc);

        intel_ddi_set_pipe_settings(crtc);
        intel_ddi_enable_transcoder_func(crtc);

        intel_update_watermarks(crtc);
        intel_enable_pipe(intel_crtc);

        if (intel_crtc->config.has_pch_encoder)
                lpt_pch_enable(crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder) {
                encoder->enable(encoder);
                intel_opregion_notify_encoder(encoder, true);
        }

        /* If we change the relative order between pipe/planes enabling, we need
         * to change the workaround. */
        haswell_mode_set_planes_workaround(intel_crtc);
        intel_crtc_enable_planes(crtc);

        drm_crtc_vblank_on(crtc);
}

static void ironlake_pfit_disable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = crtc->pipe;

        /* To avoid upsetting the power well on haswell only disable the pfit if
         * it's in use. The hw state code will make sure we get this right. */
        if (crtc->config.pch_pfit.enabled) {
                I915_WRITE(PF_CTL(pipe), 0);
                I915_WRITE(PF_WIN_POS(pipe), 0);
                I915_WRITE(PF_WIN_SZ(pipe), 0);
        }
}

static void ironlake_crtc_disable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
        u32 reg, temp;

        if (!intel_crtc->active)
                return;

        intel_crtc_disable_planes(crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                encoder->disable(encoder);

        if (intel_crtc->config.has_pch_encoder)
                intel_set_pch_fifo_underrun_reporting(dev, pipe, false);

        intel_disable_pipe(dev_priv, pipe);

        ironlake_pfit_disable(intel_crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->post_disable)
                        encoder->post_disable(encoder);

        if (intel_crtc->config.has_pch_encoder) {
                ironlake_fdi_disable(crtc);

                ironlake_disable_pch_transcoder(dev_priv, pipe);
                intel_set_pch_fifo_underrun_reporting(dev, pipe, true);

                if (HAS_PCH_CPT(dev)) {
                        /* disable TRANS_DP_CTL */
                        reg = TRANS_DP_CTL(pipe);
                        temp = I915_READ(reg);
                        temp &= ~(TRANS_DP_OUTPUT_ENABLE |
                                  TRANS_DP_PORT_SEL_MASK);
                        temp |= TRANS_DP_PORT_SEL_NONE;
                        I915_WRITE(reg, temp);

                        /* disable DPLL_SEL */
                        temp = I915_READ(PCH_DPLL_SEL);
                        temp &= ~(TRANS_DPLL_ENABLE(pipe) | TRANS_DPLLB_SEL(pipe));
                        I915_WRITE(PCH_DPLL_SEL, temp);
                }

                /* disable PCH DPLL */
                intel_disable_shared_dpll(intel_crtc);

                ironlake_fdi_pll_disable(intel_crtc);
        }

        intel_crtc->active = false;
        intel_update_watermarks(crtc);

        mutex_lock(&dev->struct_mutex);
        intel_update_fbc(dev);
        intel_edp_psr_update(dev);
        mutex_unlock(&dev->struct_mutex);
}

static void haswell_crtc_disable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
        enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;

        if (!intel_crtc->active)
                return;

        intel_crtc_disable_planes(crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder) {
                intel_opregion_notify_encoder(encoder, false);
                encoder->disable(encoder);
        }

        if (intel_crtc->config.has_pch_encoder)
                intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A, false);
        intel_disable_pipe(dev_priv, pipe);

        intel_ddi_disable_transcoder_func(dev_priv, cpu_transcoder);

        ironlake_pfit_disable(intel_crtc);

        intel_ddi_disable_pipe_clock(intel_crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->post_disable)
                        encoder->post_disable(encoder);

        if (intel_crtc->config.has_pch_encoder) {
                lpt_disable_pch_transcoder(dev_priv);
                intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A, true);
                intel_ddi_fdi_disable(crtc);
        }

        intel_crtc->active = false;
        intel_update_watermarks(crtc);

        mutex_lock(&dev->struct_mutex);
        intel_update_fbc(dev);
        intel_edp_psr_update(dev);
        mutex_unlock(&dev->struct_mutex);
}

static void ironlake_crtc_off(struct drm_crtc *crtc)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        intel_put_shared_dpll(intel_crtc);
}

static void haswell_crtc_off(struct drm_crtc *crtc)
{
        intel_ddi_put_crtc_pll(crtc);
}

static void i9xx_pfit_enable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc_config *pipe_config = &crtc->config;

        if (!crtc->config.gmch_pfit.control)
                return;

        /*
         * The panel fitter should only be adjusted whilst the pipe is disabled,
         * according to register description and PRM.
         */
        WARN_ON(I915_READ(PFIT_CONTROL) & PFIT_ENABLE);
        assert_pipe_disabled(dev_priv, crtc->pipe);

        I915_WRITE(PFIT_PGM_RATIOS, pipe_config->gmch_pfit.pgm_ratios);
        I915_WRITE(PFIT_CONTROL, pipe_config->gmch_pfit.control);

        /* Border color in case we don't scale up to the full screen. Black by
         * default, change to something else for debugging. */
        I915_WRITE(BCLRPAT(crtc->pipe), 0);
}

#define for_each_power_domain(domain, mask)                             \
        for ((domain) = 0; (domain) < POWER_DOMAIN_NUM; (domain)++)     \
                if ((1 << (domain)) & (mask))

enum intel_display_power_domain
intel_display_port_power_domain(struct intel_encoder *intel_encoder)
{
        struct drm_device *dev = intel_encoder->base.dev;
        struct intel_digital_port *intel_dig_port;

        switch (intel_encoder->type) {
        case INTEL_OUTPUT_UNKNOWN:
                /* Only DDI platforms should ever use this output type */
                WARN_ON_ONCE(!HAS_DDI(dev));
        case INTEL_OUTPUT_DISPLAYPORT:
        case INTEL_OUTPUT_HDMI:
        case INTEL_OUTPUT_EDP:
                intel_dig_port = enc_to_dig_port(&intel_encoder->base);
                switch (intel_dig_port->port) {
                case PORT_A:
                        return POWER_DOMAIN_PORT_DDI_A_4_LANES;
                case PORT_B:
                        return POWER_DOMAIN_PORT_DDI_B_4_LANES;
                case PORT_C:
                        return POWER_DOMAIN_PORT_DDI_C_4_LANES;
                case PORT_D:
                        return POWER_DOMAIN_PORT_DDI_D_4_LANES;
                default:
                        WARN_ON_ONCE(1);
                        return POWER_DOMAIN_PORT_OTHER;
                }
        case INTEL_OUTPUT_ANALOG:
                return POWER_DOMAIN_PORT_CRT;
        case INTEL_OUTPUT_DSI:
                return POWER_DOMAIN_PORT_DSI;
        default:
                return POWER_DOMAIN_PORT_OTHER;
        }
}

static unsigned long get_crtc_power_domains(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct intel_encoder *intel_encoder;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum pipe pipe = intel_crtc->pipe;
        bool pfit_enabled = intel_crtc->config.pch_pfit.enabled;
        unsigned long mask;
        enum transcoder transcoder;

        transcoder = intel_pipe_to_cpu_transcoder(dev->dev_private, pipe);

        mask = BIT(POWER_DOMAIN_PIPE(pipe));
        mask |= BIT(POWER_DOMAIN_TRANSCODER(transcoder));
        if (pfit_enabled)
                mask |= BIT(POWER_DOMAIN_PIPE_PANEL_FITTER(pipe));

        for_each_encoder_on_crtc(dev, crtc, intel_encoder)
                mask |= BIT(intel_display_port_power_domain(intel_encoder));

        return mask;
}

void intel_display_set_init_power(struct drm_i915_private *dev_priv,
                                  bool enable)
{
        if (dev_priv->power_domains.init_power_on == enable)
                return;

        if (enable)
                intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
        else
                intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);

        dev_priv->power_domains.init_power_on = enable;
}

static void modeset_update_crtc_power_domains(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        unsigned long pipe_domains[I915_MAX_PIPES] = { 0, };
        struct intel_crtc *crtc;

        /*
         * First get all needed power domains, then put all unneeded, to avoid
         * any unnecessary toggling of the power wells.
         */
        for_each_intel_crtc(dev, crtc) {
                enum intel_display_power_domain domain;

                if (!crtc->base.enabled)
                        continue;

                pipe_domains[crtc->pipe] = get_crtc_power_domains(&crtc->base);

                for_each_power_domain(domain, pipe_domains[crtc->pipe])
                        intel_display_power_get(dev_priv, domain);
        }

        for_each_intel_crtc(dev, crtc) {
                enum intel_display_power_domain domain;

                for_each_power_domain(domain, crtc->enabled_power_domains)
                        intel_display_power_put(dev_priv, domain);

                crtc->enabled_power_domains = pipe_domains[crtc->pipe];
        }

        intel_display_set_init_power(dev_priv, false);
}

int valleyview_get_vco(struct drm_i915_private *dev_priv)
{
        int hpll_freq, vco_freq[] = { 800, 1600, 2000, 2400 };

        /* Obtain SKU information */
        mutex_lock(&dev_priv->dpio_lock);
        hpll_freq = vlv_cck_read(dev_priv, CCK_FUSE_REG) &
                CCK_FUSE_HPLL_FREQ_MASK;
        mutex_unlock(&dev_priv->dpio_lock);

        return vco_freq[hpll_freq];
}

/* Adjust CDclk dividers to allow high res or save power if possible */
static void valleyview_set_cdclk(struct drm_device *dev, int cdclk)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 val, cmd;

        WARN_ON(valleyview_cur_cdclk(dev_priv) != dev_priv->vlv_cdclk_freq);
        dev_priv->vlv_cdclk_freq = cdclk;

        if (cdclk >= 320) /* jump to highest voltage for 400MHz too */
                cmd = 2;
        else if (cdclk == 266)
                cmd = 1;
        else
                cmd = 0;

        mutex_lock(&dev_priv->rps.hw_lock);
        val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
        val &= ~DSPFREQGUAR_MASK;
        val |= (cmd << DSPFREQGUAR_SHIFT);
        vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, val);
        if (wait_for((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) &
                      DSPFREQSTAT_MASK) == (cmd << DSPFREQSTAT_SHIFT),
                     50)) {
                DRM_ERROR("timed out waiting for CDclk change\n");
        }
        mutex_unlock(&dev_priv->rps.hw_lock);

        if (cdclk == 400) {
                u32 divider, vco;

                vco = valleyview_get_vco(dev_priv);
                divider = ((vco << 1) / cdclk) - 1;

                mutex_lock(&dev_priv->dpio_lock);
                /* adjust cdclk divider */
                val = vlv_cck_read(dev_priv, CCK_DISPLAY_CLOCK_CONTROL);
                val &= ~0xf;
                val |= divider;
                vlv_cck_write(dev_priv, CCK_DISPLAY_CLOCK_CONTROL, val);
                mutex_unlock(&dev_priv->dpio_lock);
        }

        mutex_lock(&dev_priv->dpio_lock);
        /* adjust self-refresh exit latency value */
        val = vlv_bunit_read(dev_priv, BUNIT_REG_BISOC);
        val &= ~0x7f;

        /*
         * For high bandwidth configs, we set a higher latency in the bunit
         * so that the core display fetch happens in time to avoid underruns.
         */
        if (cdclk == 400)
                val |= 4500 / 250; /* 4.5 usec */
        else
                val |= 3000 / 250; /* 3.0 usec */
        vlv_bunit_write(dev_priv, BUNIT_REG_BISOC, val);
        mutex_unlock(&dev_priv->dpio_lock);

        /* Since we changed the CDclk, we need to update the GMBUSFREQ too */
        intel_i2c_reset(dev);
}

int valleyview_cur_cdclk(struct drm_i915_private *dev_priv)
{
        int cur_cdclk, vco;
        int divider;

        vco = valleyview_get_vco(dev_priv);

        mutex_lock(&dev_priv->dpio_lock);
        divider = vlv_cck_read(dev_priv, CCK_DISPLAY_CLOCK_CONTROL);
        mutex_unlock(&dev_priv->dpio_lock);

        divider &= 0xf;

        cur_cdclk = (vco << 1) / (divider + 1);

        return cur_cdclk;
}

static int valleyview_calc_cdclk(struct drm_i915_private *dev_priv,
                                 int max_pixclk)
{
        /*
         * Really only a few cases to deal with, as only 4 CDclks are supported:
         *   200MHz
         *   267MHz
         *   320MHz
         *   400MHz
         * So we check to see whether we're above 90% of the lower bin and
         * adjust if needed.
         */
        if (max_pixclk > 288000) {
                return 400;
        } else if (max_pixclk > 240000) {
                return 320;
        } else
                return 266;
        /* Looks like the 200MHz CDclk freq doesn't work on some configs */
}

/* compute the max pixel clock for new configuration */
static int intel_mode_max_pixclk(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        struct intel_crtc *intel_crtc;
        int max_pixclk = 0;

        for_each_intel_crtc(dev, intel_crtc) {
                if (intel_crtc->new_enabled)
                        max_pixclk = max(max_pixclk,
                                         intel_crtc->new_config->adjusted_mode.crtc_clock);
        }

        return max_pixclk;
}

static void valleyview_modeset_global_pipes(struct drm_device *dev,
                                            unsigned *prepare_pipes)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc;
        int max_pixclk = intel_mode_max_pixclk(dev_priv);

        if (valleyview_calc_cdclk(dev_priv, max_pixclk) ==
            dev_priv->vlv_cdclk_freq)
                return;

        /* disable/enable all currently active pipes while we change cdclk */
        for_each_intel_crtc(dev, intel_crtc)
                if (intel_crtc->base.enabled)
                        *prepare_pipes |= (1 << intel_crtc->pipe);
}

static void valleyview_modeset_global_resources(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        int max_pixclk = intel_mode_max_pixclk(dev_priv);
        int req_cdclk = valleyview_calc_cdclk(dev_priv, max_pixclk);

        if (req_cdclk != dev_priv->vlv_cdclk_freq)
                valleyview_set_cdclk(dev, req_cdclk);
        modeset_update_crtc_power_domains(dev);
}

static void valleyview_crtc_enable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
        int plane = intel_crtc->plane;
        bool is_dsi;
        u32 dspcntr;

        WARN_ON(!crtc->enabled);

        if (intel_crtc->active)
                return;

        is_dsi = intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI);

        if (!is_dsi && !IS_CHERRYVIEW(dev))
                vlv_prepare_pll(intel_crtc);

        /* Set up the display plane register */
        dspcntr = DISPPLANE_GAMMA_ENABLE;

        if (intel_crtc->config.has_dp_encoder)
                intel_dp_set_m_n(intel_crtc);

        intel_set_pipe_timings(intel_crtc);

        /* pipesrc and dspsize control the size that is scaled from,
         * which should always be the user's requested size.
         */
        I915_WRITE(DSPSIZE(plane),
                   ((intel_crtc->config.pipe_src_h - 1) << 16) |
                   (intel_crtc->config.pipe_src_w - 1));
        I915_WRITE(DSPPOS(plane), 0);

        i9xx_set_pipeconf(intel_crtc);

        I915_WRITE(DSPCNTR(plane), dspcntr);
        POSTING_READ(DSPCNTR(plane));

        dev_priv->display.update_primary_plane(crtc, crtc->primary->fb,
                                               crtc->x, crtc->y);

        intel_crtc->active = true;

        intel_set_cpu_fifo_underrun_reporting(dev, pipe, true);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->pre_pll_enable)
                        encoder->pre_pll_enable(encoder);

        if (!is_dsi) {
                if (IS_CHERRYVIEW(dev))
                        chv_enable_pll(intel_crtc);
                else
                        vlv_enable_pll(intel_crtc);
        }

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->pre_enable)
                        encoder->pre_enable(encoder);

        i9xx_pfit_enable(intel_crtc);

        intel_crtc_load_lut(crtc);

        intel_update_watermarks(crtc);
        intel_enable_pipe(intel_crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                encoder->enable(encoder);

        intel_crtc_enable_planes(crtc);

        drm_crtc_vblank_on(crtc);

        /* Underruns don't raise interrupts, so check manually. */
        i9xx_check_fifo_underruns(dev);
}

static void i9xx_set_pll_dividers(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        I915_WRITE(FP0(crtc->pipe), crtc->config.dpll_hw_state.fp0);
        I915_WRITE(FP1(crtc->pipe), crtc->config.dpll_hw_state.fp1);
}

static void i9xx_crtc_enable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
        int plane = intel_crtc->plane;
        u32 dspcntr;

        WARN_ON(!crtc->enabled);

        if (intel_crtc->active)
                return;

        i9xx_set_pll_dividers(intel_crtc);

        /* Set up the display plane register */
        dspcntr = DISPPLANE_GAMMA_ENABLE;

        if (pipe == 0)
                dspcntr &= ~DISPPLANE_SEL_PIPE_MASK;
        else
                dspcntr |= DISPPLANE_SEL_PIPE_B;

        if (intel_crtc->config.has_dp_encoder)
                intel_dp_set_m_n(intel_crtc);

        intel_set_pipe_timings(intel_crtc);

        /* pipesrc and dspsize control the size that is scaled from,
         * which should always be the user's requested size.
         */
        I915_WRITE(DSPSIZE(plane),
                   ((intel_crtc->config.pipe_src_h - 1) << 16) |
                   (intel_crtc->config.pipe_src_w - 1));
        I915_WRITE(DSPPOS(plane), 0);

        i9xx_set_pipeconf(intel_crtc);

        I915_WRITE(DSPCNTR(plane), dspcntr);
        POSTING_READ(DSPCNTR(plane));

        dev_priv->display.update_primary_plane(crtc, crtc->primary->fb,
                                               crtc->x, crtc->y);

        intel_crtc->active = true;

        if (!IS_GEN2(dev))
                intel_set_cpu_fifo_underrun_reporting(dev, pipe, true);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->pre_enable)
                        encoder->pre_enable(encoder);

        i9xx_enable_pll(intel_crtc);

        i9xx_pfit_enable(intel_crtc);

        intel_crtc_load_lut(crtc);

        intel_update_watermarks(crtc);
        intel_enable_pipe(intel_crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                encoder->enable(encoder);

        intel_crtc_enable_planes(crtc);

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So don't enable underrun reporting before at least some planes
         * are enabled.
         * FIXME: Need to fix the logic to work when we turn off all planes
         * but leave the pipe running.
         */
        if (IS_GEN2(dev))
                intel_set_cpu_fifo_underrun_reporting(dev, pipe, true);

        drm_crtc_vblank_on(crtc);

        /* Underruns don't raise interrupts, so check manually. */
        i9xx_check_fifo_underruns(dev);
}

static void i9xx_pfit_disable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (!crtc->config.gmch_pfit.control)
                return;

        assert_pipe_disabled(dev_priv, crtc->pipe);

        DRM_DEBUG_DRIVER("disabling pfit, current: 0x%08x\n",
                         I915_READ(PFIT_CONTROL));
        I915_WRITE(PFIT_CONTROL, 0);
}

static void i9xx_crtc_disable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;

        if (!intel_crtc->active)
                return;

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So diasble underrun reporting before all the planes get disabled.
         * FIXME: Need to fix the logic to work when we turn off all planes
         * but leave the pipe running.
         */
        if (IS_GEN2(dev))
                intel_set_cpu_fifo_underrun_reporting(dev, pipe, false);

        intel_crtc_disable_planes(crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                encoder->disable(encoder);

        /*
         * On gen2 planes are double buffered but the pipe isn't, so we must
         * wait for planes to fully turn off before disabling the pipe.
         */
        if (IS_GEN2(dev))
                intel_wait_for_vblank(dev, pipe);

        intel_disable_pipe(dev_priv, pipe);

        i9xx_pfit_disable(intel_crtc);

        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->post_disable)
                        encoder->post_disable(encoder);

        if (!intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI)) {
                if (IS_CHERRYVIEW(dev))
                        chv_disable_pll(dev_priv, pipe);
                else if (IS_VALLEYVIEW(dev))
                        vlv_disable_pll(dev_priv, pipe);
                else
                        i9xx_disable_pll(dev_priv, pipe);
        }

        if (!IS_GEN2(dev))
                intel_set_cpu_fifo_underrun_reporting(dev, pipe, false);

        intel_crtc->active = false;
        intel_update_watermarks(crtc);

        mutex_lock(&dev->struct_mutex);
        intel_update_fbc(dev);
        intel_edp_psr_update(dev);
        mutex_unlock(&dev->struct_mutex);
}

static void i9xx_crtc_off(struct drm_crtc *crtc)
{
}

static void intel_crtc_update_sarea(struct drm_crtc *crtc,
                                    bool enabled)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_master_private *master_priv;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;

        if (!dev->primary->master)
                return;

        master_priv = dev->primary->master->driver_priv;
        if (!master_priv->sarea_priv)
                return;

        switch (pipe) {
        case 0:
                master_priv->sarea_priv->pipeA_w = enabled ? crtc->mode.hdisplay : 0;
                master_priv->sarea_priv->pipeA_h = enabled ? crtc->mode.vdisplay : 0;
                break;
        case 1:
                master_priv->sarea_priv->pipeB_w = enabled ? crtc->mode.hdisplay : 0;
                master_priv->sarea_priv->pipeB_h = enabled ? crtc->mode.vdisplay : 0;
                break;
        default:
                DRM_ERROR("Can't update pipe %c in SAREA\n", pipe_name(pipe));
                break;
        }
}

/**
 * Sets the power management mode of the pipe and plane.
 */
void intel_crtc_update_dpms(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_encoder *intel_encoder;
        bool enable = false;

        for_each_encoder_on_crtc(dev, crtc, intel_encoder)
                enable |= intel_encoder->connectors_active;

        if (enable)
                dev_priv->display.crtc_enable(crtc);
        else
                dev_priv->display.crtc_disable(crtc);

        intel_crtc_update_sarea(crtc, enable);
}

static void intel_crtc_disable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_connector *connector;
        struct drm_i915_private *dev_priv = dev->dev_private;

        /* crtc should still be enabled when we disable it. */
        WARN_ON(!crtc->enabled);

        dev_priv->display.crtc_disable(crtc);
        intel_crtc_update_sarea(crtc, false);
        dev_priv->display.off(crtc);

        assert_plane_disabled(dev->dev_private, to_intel_crtc(crtc)->plane);
        assert_cursor_disabled(dev_priv, to_intel_crtc(crtc)->pipe);
        assert_pipe_disabled(dev->dev_private, to_intel_crtc(crtc)->pipe);

        if (crtc->primary->fb) {
                mutex_lock(&dev->struct_mutex);
                intel_unpin_fb_obj(to_intel_framebuffer(crtc->primary->fb)->obj);
                mutex_unlock(&dev->struct_mutex);
                crtc->primary->fb = NULL;
        }

        /* Update computed state. */
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                if (!connector->encoder || !connector->encoder->crtc)
                        continue;

                if (connector->encoder->crtc != crtc)
                        continue;

                connector->dpms = DRM_MODE_DPMS_OFF;
                to_intel_encoder(connector->encoder)->connectors_active = false;
        }
}

void intel_encoder_destroy(struct drm_encoder *encoder)
{
        struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

        drm_encoder_cleanup(encoder);
        kfree(intel_encoder);
}

/* Simple dpms helper for encoders with just one connector, no cloning and only
 * one kind of off state. It clamps all !ON modes to fully OFF and changes the
 * state of the entire output pipe. */
static void intel_encoder_dpms(struct intel_encoder *encoder, int mode)
{
        if (mode == DRM_MODE_DPMS_ON) {
                encoder->connectors_active = true;

                intel_crtc_update_dpms(encoder->base.crtc);
        } else {
                encoder->connectors_active = false;

                intel_crtc_update_dpms(encoder->base.crtc);
        }
}

/* Cross check the actual hw state with our own modeset state tracking (and it's
 * internal consistency). */
static void intel_connector_check_state(struct intel_connector *connector)
{
        if (connector->get_hw_state(connector)) {
                struct intel_encoder *encoder = connector->encoder;
                struct drm_crtc *crtc;
                bool encoder_enabled;
                enum pipe pipe;

                DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                              connector->base.base.id,
                              connector->base.name);

                WARN(connector->base.dpms == DRM_MODE_DPMS_OFF,
                     "wrong connector dpms state\n");
                WARN(connector->base.encoder != &encoder->base,
                     "active connector not linked to encoder\n");
                WARN(!encoder->connectors_active,
                     "encoder->connectors_active not set\n");

                encoder_enabled = encoder->get_hw_state(encoder, &pipe);
                WARN(!encoder_enabled, "encoder not enabled\n");
                if (WARN_ON(!encoder->base.crtc))
                        return;

                crtc = encoder->base.crtc;

                WARN(!crtc->enabled, "crtc not enabled\n");
                WARN(!to_intel_crtc(crtc)->active, "crtc not active\n");
                WARN(pipe != to_intel_crtc(crtc)->pipe,
                     "encoder active on the wrong pipe\n");
        }
}

/* Even simpler default implementation, if there's really no special case to
 * consider. */
void intel_connector_dpms(struct drm_connector *connector, int mode)
{
        /* All the simple cases only support two dpms states. */
        if (mode != DRM_MODE_DPMS_ON)
                mode = DRM_MODE_DPMS_OFF;

        if (mode == connector->dpms)
                return;

        connector->dpms = mode;

        /* Only need to change hw state when actually enabled */
        if (connector->encoder)
                intel_encoder_dpms(to_intel_encoder(connector->encoder), mode);

        intel_modeset_check_state(connector->dev);
}

/* Simple connector->get_hw_state implementation for encoders that support only
 * one connector and no cloning and hence the encoder state determines the state
 * of the connector. */
bool intel_connector_get_hw_state(struct intel_connector *connector)
{
        enum pipe pipe = 0;
        struct intel_encoder *encoder = connector->encoder;

        return encoder->get_hw_state(encoder, &pipe);
}

static bool ironlake_check_fdi_lanes(struct drm_device *dev, enum pipe pipe,
                                     struct intel_crtc_config *pipe_config)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *pipe_B_crtc =
                to_intel_crtc(dev_priv->pipe_to_crtc_mapping[PIPE_B]);

        DRM_DEBUG_KMS("checking fdi config on pipe %c, lanes %i\n",
                      pipe_name(pipe), pipe_config->fdi_lanes);
        if (pipe_config->fdi_lanes > 4) {
                DRM_DEBUG_KMS("invalid fdi lane config on pipe %c: %i lanes\n",
                              pipe_name(pipe), pipe_config->fdi_lanes);
                return false;
        }

        if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
                if (pipe_config->fdi_lanes > 2) {
                        DRM_DEBUG_KMS("only 2 lanes on haswell, required: %i lanes\n",
                                      pipe_config->fdi_lanes);
                        return false;
                } else {
                        return true;
                }
        }

        if (INTEL_INFO(dev)->num_pipes == 2)
                return true;

        /* Ivybridge 3 pipe is really complicated */
        switch (pipe) {
        case PIPE_A:
                return true;
        case PIPE_B:
                if (dev_priv->pipe_to_crtc_mapping[PIPE_C]->enabled &&
                    pipe_config->fdi_lanes > 2) {
                        DRM_DEBUG_KMS("invalid shared fdi lane config on pipe %c: %i lanes\n",
                                      pipe_name(pipe), pipe_config->fdi_lanes);
                        return false;
                }
                return true;
        case PIPE_C:
                if (!pipe_has_enabled_pch(pipe_B_crtc) ||
                    pipe_B_crtc->config.fdi_lanes <= 2) {
                        if (pipe_config->fdi_lanes > 2) {
                                DRM_DEBUG_KMS("invalid shared fdi lane config on pipe %c: %i lanes\n",
                                              pipe_name(pipe), pipe_config->fdi_lanes);
                                return false;
                        }
                } else {
                        DRM_DEBUG_KMS("fdi link B uses too many lanes to enable link C\n");
                        return false;
                }
                return true;
        default:
                BUG();
        }
}

#define RETRY 1
static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
                                       struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
        int lane, link_bw, fdi_dotclock;
        bool setup_ok, needs_recompute = false;

retry:
        /* FDI is a binary signal running at ~2.7GHz, encoding
         * each output octet as 10 bits. The actual frequency
         * is stored as a divider into a 100MHz clock, and the
         * mode pixel clock is stored in units of 1KHz.
         * Hence the bw of each lane in terms of the mode signal
         * is:
         */
        link_bw = intel_fdi_link_freq(dev) * MHz(100)/KHz(1)/10;

        fdi_dotclock = adjusted_mode->crtc_clock;

        lane = ironlake_get_lanes_required(fdi_dotclock, link_bw,
                                           pipe_config->pipe_bpp);

        pipe_config->fdi_lanes = lane;

        intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
                               link_bw, &pipe_config->fdi_m_n);

        setup_ok = ironlake_check_fdi_lanes(intel_crtc->base.dev,
                                            intel_crtc->pipe, pipe_config);
        if (!setup_ok && pipe_config->pipe_bpp > 6*3) {
                pipe_config->pipe_bpp -= 2*3;
                DRM_DEBUG_KMS("fdi link bw constraint, reducing pipe bpp to %i\n",
                              pipe_config->pipe_bpp);
                needs_recompute = true;
                pipe_config->bw_constrained = true;

                goto retry;
        }

        if (needs_recompute)
                return RETRY;

        return setup_ok ? 0 : -EINVAL;
}

static void hsw_compute_ips_config(struct intel_crtc *crtc,
                                   struct intel_crtc_config *pipe_config)
{
        pipe_config->ips_enabled = i915.enable_ips &&
                                   hsw_crtc_supports_ips(crtc) &&
                                   pipe_config->pipe_bpp <= 24;
}

static int intel_crtc_compute_config(struct intel_crtc *crtc,
                                     struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;

        /* FIXME should check pixel clock limits on all platforms */
        if (INTEL_INFO(dev)->gen < 4) {
                struct drm_i915_private *dev_priv = dev->dev_private;
                int clock_limit =
                        dev_priv->display.get_display_clock_speed(dev);

                /*
                 * Enable pixel doubling when the dot clock
                 * is > 90% of the (display) core speed.
                 *
                 * GDG double wide on either pipe,
                 * otherwise pipe A only.
                 */
                if ((crtc->pipe == PIPE_A || IS_I915G(dev)) &&
                    adjusted_mode->crtc_clock > clock_limit * 9 / 10) {
                        clock_limit *= 2;
                        pipe_config->double_wide = true;
                }

                if (adjusted_mode->crtc_clock > clock_limit * 9 / 10)
                        return -EINVAL;
        }

        /*
         * Pipe horizontal size must be even in:
         * - DVO ganged mode
         * - LVDS dual channel mode
         * - Double wide pipe
         */
        if ((intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_LVDS) &&
             intel_is_dual_link_lvds(dev)) || pipe_config->double_wide)
                pipe_config->pipe_src_w &= ~1;

        /* Cantiga+ cannot handle modes with a hsync front porch of 0.
         * WaPruneModeWithIncorrectHsyncOffset:ctg,elk,ilk,snb,ivb,vlv,hsw.
         */
        if ((INTEL_INFO(dev)->gen > 4 || IS_G4X(dev)) &&
                adjusted_mode->hsync_start == adjusted_mode->hdisplay)
                return -EINVAL;

        if ((IS_G4X(dev) || IS_VALLEYVIEW(dev)) && pipe_config->pipe_bpp > 10*3) {
                pipe_config->pipe_bpp = 10*3; /* 12bpc is gen5+ */
        } else if (INTEL_INFO(dev)->gen <= 4 && pipe_config->pipe_bpp > 8*3) {
                /* only a 8bpc pipe, with 6bpc dither through the panel fitter
                 * for lvds. */
                pipe_config->pipe_bpp = 8*3;
        }

        if (HAS_IPS(dev))
                hsw_compute_ips_config(crtc, pipe_config);

        /* XXX: PCH clock sharing is done in ->mode_set, so make sure the old
         * clock survives for now. */
        if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
                pipe_config->shared_dpll = crtc->config.shared_dpll;

        if (pipe_config->has_pch_encoder)
                return ironlake_fdi_compute_config(crtc, pipe_config);

        return 0;
}

static int valleyview_get_display_clock_speed(struct drm_device *dev)
{
        return 400000; /* FIXME */
}

static int i945_get_display_clock_speed(struct drm_device *dev)
{
        return 400000;
}

static int i915_get_display_clock_speed(struct drm_device *dev)
{
        return 333000;
}

static int i9xx_misc_get_display_clock_speed(struct drm_device *dev)
{
        return 200000;
}

static int pnv_get_display_clock_speed(struct drm_device *dev)
{
        u16 gcfgc = 0;

        pci_read_config_word(dev->pdev, GCFGC, &gcfgc);

        switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
        case GC_DISPLAY_CLOCK_267_MHZ_PNV:
                return 267000;
        case GC_DISPLAY_CLOCK_333_MHZ_PNV:
                return 333000;
        case GC_DISPLAY_CLOCK_444_MHZ_PNV:
                return 444000;
        case GC_DISPLAY_CLOCK_200_MHZ_PNV:
                return 200000;
        default:
                DRM_ERROR("Unknown pnv display core clock 0x%04x\n", gcfgc);
        case GC_DISPLAY_CLOCK_133_MHZ_PNV:
                return 133000;
        case GC_DISPLAY_CLOCK_167_MHZ_PNV:
                return 167000;
        }
}

static int i915gm_get_display_clock_speed(struct drm_device *dev)
{
        u16 gcfgc = 0;

        pci_read_config_word(dev->pdev, GCFGC, &gcfgc);

        if (gcfgc & GC_LOW_FREQUENCY_ENABLE)
                return 133000;
        else {
                switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
                case GC_DISPLAY_CLOCK_333_MHZ:
                        return 333000;
                default:
                case GC_DISPLAY_CLOCK_190_200_MHZ:
                        return 190000;
                }
        }
}

static int i865_get_display_clock_speed(struct drm_device *dev)
{
        return 266000;
}

static int i855_get_display_clock_speed(struct drm_device *dev)
{
        u16 hpllcc = 0;
        /* Assume that the hardware is in the high speed state.  This
         * should be the default.
         */
        switch (hpllcc & GC_CLOCK_CONTROL_MASK) {
        case GC_CLOCK_133_200:
        case GC_CLOCK_100_200:
                return 200000;
        case GC_CLOCK_166_250:
                return 250000;
        case GC_CLOCK_100_133:
                return 133000;
        }

        /* Shouldn't happen */
        return 0;
}

static int i830_get_display_clock_speed(struct drm_device *dev)
{
        return 133000;
}

static void
intel_reduce_m_n_ratio(uint32_t *num, uint32_t *den)
{
        while (*num > DATA_LINK_M_N_MASK ||
               *den > DATA_LINK_M_N_MASK) {
                *num >>= 1;
                *den >>= 1;
        }
}

static void compute_m_n(unsigned int m, unsigned int n,
                        uint32_t *ret_m, uint32_t *ret_n)
{
        *ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);
        *ret_m = div_u64((uint64_t) m * *ret_n, n);
        intel_reduce_m_n_ratio(ret_m, ret_n);
}

void
intel_link_compute_m_n(int bits_per_pixel, int nlanes,
                       int pixel_clock, int link_clock,
                       struct intel_link_m_n *m_n)
{
        m_n->tu = 64;

        compute_m_n(bits_per_pixel * pixel_clock,
                    link_clock * nlanes * 8,
                    &m_n->gmch_m, &m_n->gmch_n);

        compute_m_n(pixel_clock, link_clock,
                    &m_n->link_m, &m_n->link_n);
}

static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
{
        if (i915.panel_use_ssc >= 0)
                return i915.panel_use_ssc != 0;
        return dev_priv->vbt.lvds_use_ssc
                && !(dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE);
}

static int i9xx_get_refclk(struct drm_crtc *crtc, int num_connectors)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int refclk;

        if (IS_VALLEYVIEW(dev)) {
                refclk = 100000;
        } else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
            intel_panel_use_ssc(dev_priv) && num_connectors < 2) {
                refclk = dev_priv->vbt.lvds_ssc_freq;
                DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
        } else if (!IS_GEN2(dev)) {
                refclk = 96000;
        } else {
                refclk = 48000;
        }

        return refclk;
}

static uint32_t pnv_dpll_compute_fp(struct dpll *dpll)
{
        return (1 << dpll->n) << 16 | dpll->m2;
}

static uint32_t i9xx_dpll_compute_fp(struct dpll *dpll)
{
        return dpll->n << 16 | dpll->m1 << 8 | dpll->m2;
}

static void i9xx_update_pll_dividers(struct intel_crtc *crtc,
                                     intel_clock_t *reduced_clock)
{
        struct drm_device *dev = crtc->base.dev;
        u32 fp, fp2 = 0;

        if (IS_PINEVIEW(dev)) {
                fp = pnv_dpll_compute_fp(&crtc->config.dpll);
                if (reduced_clock)
                        fp2 = pnv_dpll_compute_fp(reduced_clock);
        } else {
                fp = i9xx_dpll_compute_fp(&crtc->config.dpll);
                if (reduced_clock)
                        fp2 = i9xx_dpll_compute_fp(reduced_clock);
        }

        crtc->config.dpll_hw_state.fp0 = fp;

        crtc->lowfreq_avail = false;
        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_LVDS) &&
            reduced_clock && i915.powersave) {
                crtc->config.dpll_hw_state.fp1 = fp2;
                crtc->lowfreq_avail = true;
        } else {
                crtc->config.dpll_hw_state.fp1 = fp;
        }
}

static void vlv_pllb_recal_opamp(struct drm_i915_private *dev_priv, enum pipe
                pipe)
{
        u32 reg_val;

        /*
         * PLLB opamp always calibrates to max value of 0x3f, force enable it
         * and set it to a reasonable value instead.
         */
        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
        reg_val &= 0xffffff00;
        reg_val |= 0x00000030;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
        reg_val &= 0x8cffffff;
        reg_val = 0x8c000000;
        vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
        reg_val &= 0xffffff00;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
        reg_val &= 0x00ffffff;
        reg_val |= 0xb0000000;
        vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);
}

static void intel_pch_transcoder_set_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = crtc->pipe;

        I915_WRITE(PCH_TRANS_DATA_M1(pipe), TU_SIZE(m_n->tu) | m_n->gmch_m);
        I915_WRITE(PCH_TRANS_DATA_N1(pipe), m_n->gmch_n);
        I915_WRITE(PCH_TRANS_LINK_M1(pipe), m_n->link_m);
        I915_WRITE(PCH_TRANS_LINK_N1(pipe), m_n->link_n);
}

static void intel_cpu_transcoder_set_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = crtc->pipe;
        enum transcoder transcoder = crtc->config.cpu_transcoder;

        if (INTEL_INFO(dev)->gen >= 5) {
                I915_WRITE(PIPE_DATA_M1(transcoder), TU_SIZE(m_n->tu) | m_n->gmch_m);
                I915_WRITE(PIPE_DATA_N1(transcoder), m_n->gmch_n);
                I915_WRITE(PIPE_LINK_M1(transcoder), m_n->link_m);
                I915_WRITE(PIPE_LINK_N1(transcoder), m_n->link_n);
        } else {
                I915_WRITE(PIPE_DATA_M_G4X(pipe), TU_SIZE(m_n->tu) | m_n->gmch_m);
                I915_WRITE(PIPE_DATA_N_G4X(pipe), m_n->gmch_n);
                I915_WRITE(PIPE_LINK_M_G4X(pipe), m_n->link_m);
                I915_WRITE(PIPE_LINK_N_G4X(pipe), m_n->link_n);
        }
}

static void intel_dp_set_m_n(struct intel_crtc *crtc)
{
        if (crtc->config.has_pch_encoder)
                intel_pch_transcoder_set_m_n(crtc, &crtc->config.dp_m_n);
        else
                intel_cpu_transcoder_set_m_n(crtc, &crtc->config.dp_m_n);
}

static void vlv_update_pll(struct intel_crtc *crtc)
{
        u32 dpll, dpll_md;

        /*
         * Enable DPIO clock input. We should never disable the reference
         * clock for pipe B, since VGA hotplug / manual detection depends
         * on it.
         */
        dpll = DPLL_EXT_BUFFER_ENABLE_VLV | DPLL_REFA_CLK_ENABLE_VLV |
                DPLL_VGA_MODE_DIS | DPLL_INTEGRATED_CLOCK_VLV;
        /* We should never disable this, set it here for state tracking */
        if (crtc->pipe == PIPE_B)
                dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;
        dpll |= DPLL_VCO_ENABLE;
        crtc->config.dpll_hw_state.dpll = dpll;

        dpll_md = (crtc->config.pixel_multiplier - 1)
                << DPLL_MD_UDI_MULTIPLIER_SHIFT;
        crtc->config.dpll_hw_state.dpll_md = dpll_md;
}

static void vlv_prepare_pll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = crtc->pipe;
        u32 mdiv;
        u32 bestn, bestm1, bestm2, bestp1, bestp2;
        u32 coreclk, reg_val;

        mutex_lock(&dev_priv->dpio_lock);

        bestn = crtc->config.dpll.n;
        bestm1 = crtc->config.dpll.m1;
        bestm2 = crtc->config.dpll.m2;
        bestp1 = crtc->config.dpll.p1;
        bestp2 = crtc->config.dpll.p2;

        /* See eDP HDMI DPIO driver vbios notes doc */

        /* PLL B needs special handling */
        if (pipe == PIPE_B)
                vlv_pllb_recal_opamp(dev_priv, pipe);

        /* Set up Tx target for periodic Rcomp update */
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9_BCAST, 0x0100000f);

        /* Disable target IRef on PLL */
        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW8(pipe));
        reg_val &= 0x00ffffff;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW8(pipe), reg_val);

        /* Disable fast lock */
        vlv_dpio_write(dev_priv, pipe, VLV_CMN_DW0, 0x610);

        /* Set idtafcrecal before PLL is enabled */
        mdiv = ((bestm1 << DPIO_M1DIV_SHIFT) | (bestm2 & DPIO_M2DIV_MASK));
        mdiv |= ((bestp1 << DPIO_P1_SHIFT) | (bestp2 << DPIO_P2_SHIFT));
        mdiv |= ((bestn << DPIO_N_SHIFT));
        mdiv |= (1 << DPIO_K_SHIFT);

        /*
         * Post divider depends on pixel clock rate, DAC vs digital (and LVDS,
         * but we don't support that).
         * Note: don't use the DAC post divider as it seems unstable.
         */
        mdiv |= (DPIO_POST_DIV_HDMIDP << DPIO_POST_DIV_SHIFT);
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);

        mdiv |= DPIO_ENABLE_CALIBRATION;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);

        /* Set HBR and RBR LPF coefficients */
        if (crtc->config.port_clock == 162000 ||
            intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_ANALOG) ||
            intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_HDMI))
                vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
                                 0x009f0003);
        else
                vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
                                 0x00d0000f);

        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_EDP) ||
            intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_DISPLAYPORT)) {
                /* Use SSC source */
                if (pipe == PIPE_A)
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df40000);
                else
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df70000);
        } else { /* HDMI or VGA */
                /* Use bend source */
                if (pipe == PIPE_A)
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df70000);
                else
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df40000);
        }

        coreclk = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW7(pipe));
        coreclk = (coreclk & 0x0000ff00) | 0x01c00000;
        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_DISPLAYPORT) ||
            intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_EDP))
                coreclk |= 0x01000000;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW7(pipe), coreclk);

        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW11(pipe), 0x87871000);
        mutex_unlock(&dev_priv->dpio_lock);
}

static void chv_update_pll(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = crtc->pipe;
        int dpll_reg = DPLL(crtc->pipe);
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 loopfilter, intcoeff;
        u32 bestn, bestm1, bestm2, bestp1, bestp2, bestm2_frac;
        int refclk;

        crtc->config.dpll_hw_state.dpll = DPLL_SSC_REF_CLOCK_CHV |
                DPLL_REFA_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS |
                DPLL_VCO_ENABLE;
        if (pipe != PIPE_A)
                crtc->config.dpll_hw_state.dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;

        crtc->config.dpll_hw_state.dpll_md =
                (crtc->config.pixel_multiplier - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;

        bestn = crtc->config.dpll.n;
        bestm2_frac = crtc->config.dpll.m2 & 0x3fffff;
        bestm1 = crtc->config.dpll.m1;
        bestm2 = crtc->config.dpll.m2 >> 22;
        bestp1 = crtc->config.dpll.p1;
        bestp2 = crtc->config.dpll.p2;

        /*
         * Enable Refclk and SSC
         */
        I915_WRITE(dpll_reg,
                   crtc->config.dpll_hw_state.dpll & ~DPLL_VCO_ENABLE);

        mutex_lock(&dev_priv->dpio_lock);

        /* p1 and p2 divider */
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW13(port),
                        5 << DPIO_CHV_S1_DIV_SHIFT |
                        bestp1 << DPIO_CHV_P1_DIV_SHIFT |
                        bestp2 << DPIO_CHV_P2_DIV_SHIFT |
                        1 << DPIO_CHV_K_DIV_SHIFT);

        /* Feedback post-divider - m2 */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW0(port), bestm2);

        /* Feedback refclk divider - n and m1 */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW1(port),
                        DPIO_CHV_M1_DIV_BY_2 |
                        1 << DPIO_CHV_N_DIV_SHIFT);

        /* M2 fraction division */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);

        /* M2 fraction division enable */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port),
                       DPIO_CHV_FRAC_DIV_EN |
                       (2 << DPIO_CHV_FEEDFWD_GAIN_SHIFT));

        /* Loop filter */
        refclk = i9xx_get_refclk(&crtc->base, 0);
        loopfilter = 5 << DPIO_CHV_PROP_COEFF_SHIFT |
                2 << DPIO_CHV_GAIN_CTRL_SHIFT;
        if (refclk == 100000)
                intcoeff = 11;
        else if (refclk == 38400)
                intcoeff = 10;
        else
                intcoeff = 9;
        loopfilter |= intcoeff << DPIO_CHV_INT_COEFF_SHIFT;
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW6(port), loopfilter);

        /* AFC Recal */
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port),
                        vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port)) |
                        DPIO_AFC_RECAL);

        mutex_unlock(&dev_priv->dpio_lock);
}

static void i9xx_update_pll(struct intel_crtc *crtc,
                            intel_clock_t *reduced_clock,
                            int num_connectors)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 dpll;
        bool is_sdvo;
        struct dpll *clock = &crtc->config.dpll;

        i9xx_update_pll_dividers(crtc, reduced_clock);

        is_sdvo = intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_SDVO) ||
                intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_HDMI);

        dpll = DPLL_VGA_MODE_DIS;

        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_LVDS))
                dpll |= DPLLB_MODE_LVDS;
        else
                dpll |= DPLLB_MODE_DAC_SERIAL;

        if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev)) {
                dpll |= (crtc->config.pixel_multiplier - 1)
                        << SDVO_MULTIPLIER_SHIFT_HIRES;
        }

        if (is_sdvo)
                dpll |= DPLL_SDVO_HIGH_SPEED;

        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_DISPLAYPORT))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /* compute bitmask from p1 value */
        if (IS_PINEVIEW(dev))
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW;
        else {
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                if (IS_G4X(dev) && reduced_clock)
                        dpll |= (1 << (reduced_clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
        }
        switch (clock->p2) {
        case 5:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                break;
        case 7:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                break;
        case 10:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                break;
        case 14:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                break;
        }
        if (INTEL_INFO(dev)->gen >= 4)
                dpll |= (6 << PLL_LOAD_PULSE_PHASE_SHIFT);

        if (crtc->config.sdvo_tv_clock)
                dpll |= PLL_REF_INPUT_TVCLKINBC;
        else if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_LVDS) &&
                 intel_panel_use_ssc(dev_priv) && num_connectors < 2)
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;
        crtc->config.dpll_hw_state.dpll = dpll;

        if (INTEL_INFO(dev)->gen >= 4) {
                u32 dpll_md = (crtc->config.pixel_multiplier - 1)
                        << DPLL_MD_UDI_MULTIPLIER_SHIFT;
                crtc->config.dpll_hw_state.dpll_md = dpll_md;
        }
}

static void i8xx_update_pll(struct intel_crtc *crtc,
                            intel_clock_t *reduced_clock,
                            int num_connectors)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 dpll;
        struct dpll *clock = &crtc->config.dpll;

        i9xx_update_pll_dividers(crtc, reduced_clock);

        dpll = DPLL_VGA_MODE_DIS;

        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_LVDS)) {
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
        } else {
                if (clock->p1 == 2)
                        dpll |= PLL_P1_DIVIDE_BY_TWO;
                else
                        dpll |= (clock->p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                if (clock->p2 == 4)
                        dpll |= PLL_P2_DIVIDE_BY_4;
        }

        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_DVO))
                dpll |= DPLL_DVO_2X_MODE;

        if (intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_LVDS) &&
                 intel_panel_use_ssc(dev_priv) && num_connectors < 2)
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;
        crtc->config.dpll_hw_state.dpll = dpll;
}

static void intel_set_pipe_timings(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum pipe pipe = intel_crtc->pipe;
        enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
        struct drm_display_mode *adjusted_mode =
                &intel_crtc->config.adjusted_mode;
        uint32_t crtc_vtotal, crtc_vblank_end;
        int vsyncshift = 0;

        /* We need to be careful not to changed the adjusted mode, for otherwise
         * the hw state checker will get angry at the mismatch. */
        crtc_vtotal = adjusted_mode->crtc_vtotal;
        crtc_vblank_end = adjusted_mode->crtc_vblank_end;

        if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
                /* the chip adds 2 halflines automatically */
                crtc_vtotal -= 1;
                crtc_vblank_end -= 1;

                if (intel_pipe_has_type(&intel_crtc->base, INTEL_OUTPUT_SDVO))
                        vsyncshift = (adjusted_mode->crtc_htotal - 1) / 2;
                else
                        vsyncshift = adjusted_mode->crtc_hsync_start -
                                adjusted_mode->crtc_htotal / 2;
                if (vsyncshift < 0)
                        vsyncshift += adjusted_mode->crtc_htotal;
        }

        if (INTEL_INFO(dev)->gen > 3)
                I915_WRITE(VSYNCSHIFT(cpu_transcoder), vsyncshift);

        I915_WRITE(HTOTAL(cpu_transcoder),
                   (adjusted_mode->crtc_hdisplay - 1) |
                   ((adjusted_mode->crtc_htotal - 1) << 16));
        I915_WRITE(HBLANK(cpu_transcoder),
                   (adjusted_mode->crtc_hblank_start - 1) |
                   ((adjusted_mode->crtc_hblank_end - 1) << 16));
        I915_WRITE(HSYNC(cpu_transcoder),
                   (adjusted_mode->crtc_hsync_start - 1) |
                   ((adjusted_mode->crtc_hsync_end - 1) << 16));

        I915_WRITE(VTOTAL(cpu_transcoder),
                   (adjusted_mode->crtc_vdisplay - 1) |
                   ((crtc_vtotal - 1) << 16));
        I915_WRITE(VBLANK(cpu_transcoder),
                   (adjusted_mode->crtc_vblank_start - 1) |
                   ((crtc_vblank_end - 1) << 16));
        I915_WRITE(VSYNC(cpu_transcoder),
                   (adjusted_mode->crtc_vsync_start - 1) |
                   ((adjusted_mode->crtc_vsync_end - 1) << 16));

        /* Workaround: when the EDP input selection is B, the VTOTAL_B must be
         * programmed with the VTOTAL_EDP value. Same for VTOTAL_C. This is
         * documented on the DDI_FUNC_CTL register description, EDP Input Select
         * bits. */
        if (IS_HASWELL(dev) && cpu_transcoder == TRANSCODER_EDP &&
            (pipe == PIPE_B || pipe == PIPE_C))
                I915_WRITE(VTOTAL(pipe), I915_READ(VTOTAL(cpu_transcoder)));

        /* pipesrc controls the size that is scaled from, which should
         * always be the user's requested size.
         */
        I915_WRITE(PIPESRC(pipe),
                   ((intel_crtc->config.pipe_src_w - 1) << 16) |
                   (intel_crtc->config.pipe_src_h - 1));
}

static void intel_get_pipe_timings(struct intel_crtc *crtc,
                                   struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
        uint32_t tmp;

        tmp = I915_READ(HTOTAL(cpu_transcoder));
        pipe_config->adjusted_mode.crtc_hdisplay = (tmp & 0xffff) + 1;
        pipe_config->adjusted_mode.crtc_htotal = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(HBLANK(cpu_transcoder));
        pipe_config->adjusted_mode.crtc_hblank_start = (tmp & 0xffff) + 1;
        pipe_config->adjusted_mode.crtc_hblank_end = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(HSYNC(cpu_transcoder));
        pipe_config->adjusted_mode.crtc_hsync_start = (tmp & 0xffff) + 1;
        pipe_config->adjusted_mode.crtc_hsync_end = ((tmp >> 16) & 0xffff) + 1;

        tmp = I915_READ(VTOTAL(cpu_transcoder));
        pipe_config->adjusted_mode.crtc_vdisplay = (tmp & 0xffff) + 1;
        pipe_config->adjusted_mode.crtc_vtotal = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(VBLANK(cpu_transcoder));
        pipe_config->adjusted_mode.crtc_vblank_start = (tmp & 0xffff) + 1;
        pipe_config->adjusted_mode.crtc_vblank_end = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(VSYNC(cpu_transcoder));
        pipe_config->adjusted_mode.crtc_vsync_start = (tmp & 0xffff) + 1;
        pipe_config->adjusted_mode.crtc_vsync_end = ((tmp >> 16) & 0xffff) + 1;

        if (I915_READ(PIPECONF(cpu_transcoder)) & PIPECONF_INTERLACE_MASK) {
                pipe_config->adjusted_mode.flags |= DRM_MODE_FLAG_INTERLACE;
                pipe_config->adjusted_mode.crtc_vtotal += 1;
                pipe_config->adjusted_mode.crtc_vblank_end += 1;
        }

        tmp = I915_READ(PIPESRC(crtc->pipe));
        pipe_config->pipe_src_h = (tmp & 0xffff) + 1;
        pipe_config->pipe_src_w = ((tmp >> 16) & 0xffff) + 1;

        pipe_config->requested_mode.vdisplay = pipe_config->pipe_src_h;
        pipe_config->requested_mode.hdisplay = pipe_config->pipe_src_w;
}

void intel_mode_from_pipe_config(struct drm_display_mode *mode,
                                 struct intel_crtc_config *pipe_config)
{
        mode->hdisplay = pipe_config->adjusted_mode.crtc_hdisplay;
        mode->htotal = pipe_config->adjusted_mode.crtc_htotal;
        mode->hsync_start = pipe_config->adjusted_mode.crtc_hsync_start;
        mode->hsync_end = pipe_config->adjusted_mode.crtc_hsync_end;

        mode->vdisplay = pipe_config->adjusted_mode.crtc_vdisplay;
        mode->vtotal = pipe_config->adjusted_mode.crtc_vtotal;
        mode->vsync_start = pipe_config->adjusted_mode.crtc_vsync_start;
        mode->vsync_end = pipe_config->adjusted_mode.crtc_vsync_end;

        mode->flags = pipe_config->adjusted_mode.flags;

        mode->clock = pipe_config->adjusted_mode.crtc_clock;
        mode->flags |= pipe_config->adjusted_mode.flags;
}

static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t pipeconf;

        pipeconf = 0;

        if (dev_priv->quirks & QUIRK_PIPEA_FORCE &&
            I915_READ(PIPECONF(intel_crtc->pipe)) & PIPECONF_ENABLE)
                pipeconf |= PIPECONF_ENABLE;

        if (intel_crtc->config.double_wide)
                pipeconf |= PIPECONF_DOUBLE_WIDE;

        /* only g4x and later have fancy bpc/dither controls */
        if (IS_G4X(dev) || IS_VALLEYVIEW(dev)) {
                /* Bspec claims that we can't use dithering for 30bpp pipes. */
                if (intel_crtc->config.dither && intel_crtc->config.pipe_bpp != 30)
                        pipeconf |= PIPECONF_DITHER_EN |
                                    PIPECONF_DITHER_TYPE_SP;

                switch (intel_crtc->config.pipe_bpp) {
                case 18:
                        pipeconf |= PIPECONF_6BPC;
                        break;
                case 24:
                        pipeconf |= PIPECONF_8BPC;
                        break;
                case 30:
                        pipeconf |= PIPECONF_10BPC;
                        break;
                default:
                        /* Case prevented by intel_choose_pipe_bpp_dither. */
                        BUG();
                }
        }

        if (HAS_PIPE_CXSR(dev)) {
                if (intel_crtc->lowfreq_avail) {
                        DRM_DEBUG_KMS("enabling CxSR downclocking\n");
                        pipeconf |= PIPECONF_CXSR_DOWNCLOCK;
                } else {
                        DRM_DEBUG_KMS("disabling CxSR downclocking\n");
                }
        }

        if (intel_crtc->config.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
                if (INTEL_INFO(dev)->gen < 4 ||
                    intel_pipe_has_type(&intel_crtc->base, INTEL_OUTPUT_SDVO))
                        pipeconf |= PIPECONF_INTERLACE_W_FIELD_INDICATION;
                else
                        pipeconf |= PIPECONF_INTERLACE_W_SYNC_SHIFT;
        } else
                pipeconf |= PIPECONF_PROGRESSIVE;

        if (IS_VALLEYVIEW(dev) && intel_crtc->config.limited_color_range)
                pipeconf |= PIPECONF_COLOR_RANGE_SELECT;

        I915_WRITE(PIPECONF(intel_crtc->pipe), pipeconf);
        POSTING_READ(PIPECONF(intel_crtc->pipe));
}

static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
                              int x, int y,
                              struct drm_framebuffer *fb)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int refclk, num_connectors = 0;
        intel_clock_t clock, reduced_clock;
        bool ok, has_reduced_clock = false;
        bool is_lvds = false, is_dsi = false;
        struct intel_encoder *encoder;
        const intel_limit_t *limit;

        for_each_encoder_on_crtc(dev, crtc, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        is_lvds = true;
                        break;
                case INTEL_OUTPUT_DSI:
                        is_dsi = true;
                        break;
                }

                num_connectors++;
        }

        if (is_dsi)
                return 0;

        if (!intel_crtc->config.clock_set) {
                refclk = i9xx_get_refclk(crtc, num_connectors);

                /*
                 * Returns a set of divisors for the desired target clock with
                 * the given refclk, or FALSE.  The returned values represent
                 * the clock equation: reflck * (5 * (m1 + 2) + (m2 + 2)) / (n +
                 * 2) / p1 / p2.
                 */
                limit = intel_limit(crtc, refclk);
                ok = dev_priv->display.find_dpll(limit, crtc,
                                                 intel_crtc->config.port_clock,
                                                 refclk, NULL, &clock);
                if (!ok) {
                        DRM_ERROR("Couldn't find PLL settings for mode!\n");
                        return -EINVAL;
                }

                if (is_lvds && dev_priv->lvds_downclock_avail) {
                        /*
                         * Ensure we match the reduced clock's P to the target
                         * clock.  If the clocks don't match, we can't switch
                         * the display clock by using the FP0/FP1. In such case
                         * we will disable the LVDS downclock feature.
                         */
                        has_reduced_clock =
                                dev_priv->display.find_dpll(limit, crtc,
                                                            dev_priv->lvds_downclock,
                                                            refclk, &clock,
                                                            &reduced_clock);
                }
                /* Compat-code for transition, will disappear. */
                intel_crtc->config.dpll.n = clock.n;
                intel_crtc->config.dpll.m1 = clock.m1;
                intel_crtc->config.dpll.m2 = clock.m2;
                intel_crtc->config.dpll.p1 = clock.p1;
                intel_crtc->config.dpll.p2 = clock.p2;
        }

        if (IS_GEN2(dev)) {
                i8xx_update_pll(intel_crtc,
                                has_reduced_clock ? &reduced_clock : NULL,
                                num_connectors);
        } else if (IS_CHERRYVIEW(dev)) {
                chv_update_pll(intel_crtc);
        } else if (IS_VALLEYVIEW(dev)) {
                vlv_update_pll(intel_crtc);
        } else {
                i9xx_update_pll(intel_crtc,
                                has_reduced_clock ? &reduced_clock : NULL,
                                num_connectors);
        }

        return 0;
}

static void i9xx_get_pfit_config(struct intel_crtc *crtc,
                                 struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t tmp;

        if (INTEL_INFO(dev)->gen <= 3 && (IS_I830(dev) || !IS_MOBILE(dev)))
                return;

        tmp = I915_READ(PFIT_CONTROL);
        if (!(tmp & PFIT_ENABLE))
                return;

        /* Check whether the pfit is attached to our pipe. */
        if (INTEL_INFO(dev)->gen < 4) {
                if (crtc->pipe != PIPE_B)
                        return;
        } else {
                if ((tmp & PFIT_PIPE_MASK) != (crtc->pipe << PFIT_PIPE_SHIFT))
                        return;
        }

        pipe_config->gmch_pfit.control = tmp;
        pipe_config->gmch_pfit.pgm_ratios = I915_READ(PFIT_PGM_RATIOS);
        if (INTEL_INFO(dev)->gen < 5)
                pipe_config->gmch_pfit.lvds_border_bits =
                        I915_READ(LVDS) & LVDS_BORDER_ENABLE;
}

static void vlv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = pipe_config->cpu_transcoder;
        intel_clock_t clock;
        u32 mdiv;
        int refclk = 100000;

        mutex_lock(&dev_priv->dpio_lock);
        mdiv = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW3(pipe));
        mutex_unlock(&dev_priv->dpio_lock);

        clock.m1 = (mdiv >> DPIO_M1DIV_SHIFT) & 7;
        clock.m2 = mdiv & DPIO_M2DIV_MASK;
        clock.n = (mdiv >> DPIO_N_SHIFT) & 0xf;
        clock.p1 = (mdiv >> DPIO_P1_SHIFT) & 7;
        clock.p2 = (mdiv >> DPIO_P2_SHIFT) & 0x1f;

        vlv_clock(refclk, &clock);

        /* clock.dot is the fast clock */
        pipe_config->port_clock = clock.dot / 5;
}

static void i9xx_get_plane_config(struct intel_crtc *crtc,
                                  struct intel_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 val, base, offset;
        int pipe = crtc->pipe, plane = crtc->plane;
        int fourcc, pixel_format;
        int aligned_height;

        crtc->base.primary->fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
        if (!crtc->base.primary->fb) {
                DRM_DEBUG_KMS("failed to alloc fb\n");
                return;
        }

        val = I915_READ(DSPCNTR(plane));

        if (INTEL_INFO(dev)->gen >= 4)
                if (val & DISPPLANE_TILED)
                        plane_config->tiled = true;

        pixel_format = val & DISPPLANE_PIXFORMAT_MASK;
        fourcc = intel_format_to_fourcc(pixel_format);
        crtc->base.primary->fb->pixel_format = fourcc;
        crtc->base.primary->fb->bits_per_pixel =
                drm_format_plane_cpp(fourcc, 0) * 8;

        if (INTEL_INFO(dev)->gen >= 4) {
                if (plane_config->tiled)
                        offset = I915_READ(DSPTILEOFF(plane));
                else
                        offset = I915_READ(DSPLINOFF(plane));
                base = I915_READ(DSPSURF(plane)) & 0xfffff000;
        } else {
                base = I915_READ(DSPADDR(plane));
        }
        plane_config->base = base;

        val = I915_READ(PIPESRC(pipe));
        crtc->base.primary->fb->width = ((val >> 16) & 0xfff) + 1;
        crtc->base.primary->fb->height = ((val >> 0) & 0xfff) + 1;

        val = I915_READ(DSPSTRIDE(pipe));
        crtc->base.primary->fb->pitches[0] = val & 0xffffff80;

        aligned_height = intel_align_height(dev, crtc->base.primary->fb->height,
                                            plane_config->tiled);

        plane_config->size = ALIGN(crtc->base.primary->fb->pitches[0] *
                                   aligned_height, PAGE_SIZE);

        DRM_DEBUG_KMS("pipe/plane %d/%d with fb: size=%dx%d@%d, offset=%x, pitch %d, size 0x%x\n",
                      pipe, plane, crtc->base.primary->fb->width,
                      crtc->base.primary->fb->height,
                      crtc->base.primary->fb->bits_per_pixel, base,
                      crtc->base.primary->fb->pitches[0],
                      plane_config->size);

}

static void chv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = pipe_config->cpu_transcoder;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        intel_clock_t clock;
        u32 cmn_dw13, pll_dw0, pll_dw1, pll_dw2;
        int refclk = 100000;

        mutex_lock(&dev_priv->dpio_lock);
        cmn_dw13 = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW13(port));
        pll_dw0 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW0(port));
        pll_dw1 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW1(port));
        pll_dw2 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW2(port));
        mutex_unlock(&dev_priv->dpio_lock);

        clock.m1 = (pll_dw1 & 0x7) == DPIO_CHV_M1_DIV_BY_2 ? 2 : 0;
        clock.m2 = ((pll_dw0 & 0xff) << 22) | (pll_dw2 & 0x3fffff);
        clock.n = (pll_dw1 >> DPIO_CHV_N_DIV_SHIFT) & 0xf;
        clock.p1 = (cmn_dw13 >> DPIO_CHV_P1_DIV_SHIFT) & 0x7;
        clock.p2 = (cmn_dw13 >> DPIO_CHV_P2_DIV_SHIFT) & 0x1f;

        chv_clock(refclk, &clock);

        /* clock.dot is the fast clock */
        pipe_config->port_clock = clock.dot / 5;
}

static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
                                 struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t tmp;

        if (!intel_display_power_enabled(dev_priv,
                                         POWER_DOMAIN_PIPE(crtc->pipe)))
                return false;

        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = DPLL_ID_PRIVATE;

        tmp = I915_READ(PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                return false;

        if (IS_G4X(dev) || IS_VALLEYVIEW(dev)) {
                switch (tmp & PIPECONF_BPC_MASK) {
                case PIPECONF_6BPC:
                        pipe_config->pipe_bpp = 18;
                        break;
                case PIPECONF_8BPC:
                        pipe_config->pipe_bpp = 24;
                        break;
                case PIPECONF_10BPC:
                        pipe_config->pipe_bpp = 30;
                        break;
                default:
                        break;
                }
        }

        if (IS_VALLEYVIEW(dev) && (tmp & PIPECONF_COLOR_RANGE_SELECT))
                pipe_config->limited_color_range = true;

        if (INTEL_INFO(dev)->gen < 4)
                pipe_config->double_wide = tmp & PIPECONF_DOUBLE_WIDE;

        intel_get_pipe_timings(crtc, pipe_config);

        i9xx_get_pfit_config(crtc, pipe_config);

        if (INTEL_INFO(dev)->gen >= 4) {
                tmp = I915_READ(DPLL_MD(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & DPLL_MD_UDI_MULTIPLIER_MASK)
                         >> DPLL_MD_UDI_MULTIPLIER_SHIFT) + 1;
                pipe_config->dpll_hw_state.dpll_md = tmp;
        } else if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev)) {
                tmp = I915_READ(DPLL(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & SDVO_MULTIPLIER_MASK)
                         >> SDVO_MULTIPLIER_SHIFT_HIRES) + 1;
        } else {
                /* Note that on i915G/GM the pixel multiplier is in the sdvo
                 * port and will be fixed up in the encoder->get_config
                 * function. */
                pipe_config->pixel_multiplier = 1;
        }
        pipe_config->dpll_hw_state.dpll = I915_READ(DPLL(crtc->pipe));
        if (!IS_VALLEYVIEW(dev)) {
                pipe_config->dpll_hw_state.fp0 = I915_READ(FP0(crtc->pipe));
                pipe_config->dpll_hw_state.fp1 = I915_READ(FP1(crtc->pipe));
        } else {
                /* Mask out read-only status bits. */
                pipe_config->dpll_hw_state.dpll &= ~(DPLL_LOCK_VLV |
                                                     DPLL_PORTC_READY_MASK |
                                                     DPLL_PORTB_READY_MASK);
        }

        if (IS_CHERRYVIEW(dev))
                chv_crtc_clock_get(crtc, pipe_config);
        else if (IS_VALLEYVIEW(dev))
                vlv_crtc_clock_get(crtc, pipe_config);
        else
                i9xx_crtc_clock_get(crtc, pipe_config);

        return true;
}

static void ironlake_init_pch_refclk(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct intel_encoder *encoder;
        u32 val, final;
        bool has_lvds = false;
        bool has_cpu_edp = false;
        bool has_panel = false;
        bool has_ck505 = false;
        bool can_ssc = false;

        /* We need to take the global config into account */
        list_for_each_entry(encoder, &mode_config->encoder_list,
                            base.head) {
                switch (encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        has_panel = true;
                        has_lvds = true;
                        break;
                case INTEL_OUTPUT_EDP:
                        has_panel = true;
                        if (enc_to_dig_port(&encoder->base)->port == PORT_A)
                                has_cpu_edp = true;
                        break;
                }
        }

        if (HAS_PCH_IBX(dev)) {
                has_ck505 = dev_priv->vbt.display_clock_mode;
                can_ssc = has_ck505;
        } else {
                has_ck505 = false;
                can_ssc = true;
        }

        DRM_DEBUG_KMS("has_panel %d has_lvds %d has_ck505 %d\n",
                      has_panel, has_lvds, has_ck505);

        /* Ironlake: try to setup display ref clock before DPLL
         * enabling. This is only under driver's control after
         * PCH B stepping, previous chipset stepping should be
         * ignoring this setting.
         */
        val = I915_READ(PCH_DREF_CONTROL);

        /* As we must carefully and slowly disable/enable each source in turn,
         * compute the final state we want first and check if we need to
         * make any changes at all.
         */
        final = val;
        final &= ~DREF_NONSPREAD_SOURCE_MASK;
        if (has_ck505)
                final |= DREF_NONSPREAD_CK505_ENABLE;
        else
                final |= DREF_NONSPREAD_SOURCE_ENABLE;

        final &= ~DREF_SSC_SOURCE_MASK;
        final &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
        final &= ~DREF_SSC1_ENABLE;

        if (has_panel) {
                final |= DREF_SSC_SOURCE_ENABLE;

                if (intel_panel_use_ssc(dev_priv) && can_ssc)
                        final |= DREF_SSC1_ENABLE;

                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc)
                                final |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        else
                                final |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        final |= DREF_CPU_SOURCE_OUTPUT_DISABLE;
        } else {
                final |= DREF_SSC_SOURCE_DISABLE;
                final |= DREF_CPU_SOURCE_OUTPUT_DISABLE;
        }

        if (final == val)
                return;

        /* Always enable nonspread source */
        val &= ~DREF_NONSPREAD_SOURCE_MASK;

        if (has_ck505)
                val |= DREF_NONSPREAD_CK505_ENABLE;
        else
                val |= DREF_NONSPREAD_SOURCE_ENABLE;

        if (has_panel) {
                val &= ~DREF_SSC_SOURCE_MASK;
                val |= DREF_SSC_SOURCE_ENABLE;

                /* SSC must be turned on before enabling the CPU output  */
                if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                        DRM_DEBUG_KMS("Using SSC on panel\n");
                        val |= DREF_SSC1_ENABLE;
                } else
                        val &= ~DREF_SSC1_ENABLE;

                /* Get SSC going before enabling the outputs */
                I915_WRITE(PCH_DREF_CONTROL, val);
                POSTING_READ(PCH_DREF_CONTROL);
                udelay(200);

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Enable CPU source on CPU attached eDP */
                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                                DRM_DEBUG_KMS("Using SSC on eDP\n");
                                val |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        } else
                                val |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                I915_WRITE(PCH_DREF_CONTROL, val);
                POSTING_READ(PCH_DREF_CONTROL);
                udelay(200);
        } else {
                DRM_DEBUG_KMS("Disabling SSC entirely\n");

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Turn off CPU output */
                val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                I915_WRITE(PCH_DREF_CONTROL, val);
                POSTING_READ(PCH_DREF_CONTROL);
                udelay(200);

                /* Turn off the SSC source */
                val &= ~DREF_SSC_SOURCE_MASK;
                val |= DREF_SSC_SOURCE_DISABLE;

                /* Turn off SSC1 */
                val &= ~DREF_SSC1_ENABLE;

                I915_WRITE(PCH_DREF_CONTROL, val);
                POSTING_READ(PCH_DREF_CONTROL);
                udelay(200);
        }

        BUG_ON(val != final);
}

static void lpt_reset_fdi_mphy(struct drm_i915_private *dev_priv)
{
        uint32_t tmp;

        tmp = I915_READ(SOUTH_CHICKEN2);
        tmp |= FDI_MPHY_IOSFSB_RESET_CTL;
        I915_WRITE(SOUTH_CHICKEN2, tmp);

        if (wait_for_atomic_us(I915_READ(SOUTH_CHICKEN2) &
                               FDI_MPHY_IOSFSB_RESET_STATUS, 100))
                DRM_ERROR("FDI mPHY reset assert timeout\n");

        tmp = I915_READ(SOUTH_CHICKEN2);
        tmp &= ~FDI_MPHY_IOSFSB_RESET_CTL;
        I915_WRITE(SOUTH_CHICKEN2, tmp);

        if (wait_for_atomic_us((I915_READ(SOUTH_CHICKEN2) &
                                FDI_MPHY_IOSFSB_RESET_STATUS) == 0, 100))
                DRM_ERROR("FDI mPHY reset de-assert timeout\n");
}

/* WaMPhyProgramming:hsw */
static void lpt_program_fdi_mphy(struct drm_i915_private *dev_priv)
{
        uint32_t tmp;

        tmp = intel_sbi_read(dev_priv, 0x8008, SBI_MPHY);
        tmp &= ~(0xFF << 24);
        tmp |= (0x12 << 24);
        intel_sbi_write(dev_priv, 0x8008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2008, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2108, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2108, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x206C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x206C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x216C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x216C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2080, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2080, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2180, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2180, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x208C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x208C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x218C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x218C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2098, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2098, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2198, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2198, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x20C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x21C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x20EC, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x21EC, tmp, SBI_MPHY);
}

/* Implements 3 different sequences from BSpec chapter "Display iCLK
 * Programming" based on the parameters passed:
 * - Sequence to enable CLKOUT_DP
 * - Sequence to enable CLKOUT_DP without spread
 * - Sequence to enable CLKOUT_DP for FDI usage and configure PCH FDI I/O
 */
static void lpt_enable_clkout_dp(struct drm_device *dev, bool with_spread,
                                 bool with_fdi)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t reg, tmp;

        if (WARN(with_fdi && !with_spread, "FDI requires downspread\n"))
                with_spread = true;
        if (WARN(dev_priv->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE &&
                 with_fdi, "LP PCH doesn't have FDI\n"))
                with_fdi = false;

        mutex_lock(&dev_priv->dpio_lock);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        tmp &= ~SBI_SSCCTL_DISABLE;
        tmp |= SBI_SSCCTL_PATHALT;
        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

        udelay(24);

        if (with_spread) {
                tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
                tmp &= ~SBI_SSCCTL_PATHALT;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

                if (with_fdi) {
                        lpt_reset_fdi_mphy(dev_priv);
                        lpt_program_fdi_mphy(dev_priv);
                }
        }

        reg = (dev_priv->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE) ?
               SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp |= SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        mutex_unlock(&dev_priv->dpio_lock);
}

/* Sequence to disable CLKOUT_DP */
static void lpt_disable_clkout_dp(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t reg, tmp;

        mutex_lock(&dev_priv->dpio_lock);

        reg = (dev_priv->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE) ?
               SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp &= ~SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        if (!(tmp & SBI_SSCCTL_DISABLE)) {
                if (!(tmp & SBI_SSCCTL_PATHALT)) {
                        tmp |= SBI_SSCCTL_PATHALT;
                        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
                        udelay(32);
                }
                tmp |= SBI_SSCCTL_DISABLE;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
        }

        mutex_unlock(&dev_priv->dpio_lock);
}

static void lpt_init_pch_refclk(struct drm_device *dev)
{
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct intel_encoder *encoder;
        bool has_vga = false;

        list_for_each_entry(encoder, &mode_config->encoder_list, base.head) {
                switch (encoder->type) {
                case INTEL_OUTPUT_ANALOG:
                        has_vga = true;
                        break;
                }
        }

        if (has_vga)
                lpt_enable_clkout_dp(dev, true, true);
        else
                lpt_disable_clkout_dp(dev);
}

/*
 * Initialize reference clocks when the driver loads
 */
void intel_init_pch_refclk(struct drm_device *dev)
{
        if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
                ironlake_init_pch_refclk(dev);
        else if (HAS_PCH_LPT(dev))
                lpt_init_pch_refclk(dev);
}

static int ironlake_get_refclk(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_encoder *encoder;
        int num_connectors = 0;
        bool is_lvds = false;

        for_each_encoder_on_crtc(dev, crtc, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        is_lvds = true;
                        break;
                }
                num_connectors++;
        }

        if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2) {
                DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n",
                              dev_priv->vbt.lvds_ssc_freq);
                return dev_priv->vbt.lvds_ssc_freq;
        }

        return 120000;
}

static void ironlake_set_pipeconf(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = crtc->dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        uint32_t val;

        val = 0;

        switch (intel_crtc->config.pipe_bpp) {
        case 18:
                val |= PIPECONF_6BPC;
                break;
        case 24:
                val |= PIPECONF_8BPC;
                break;
        case 30:
                val |= PIPECONF_10BPC;
                break;
        case 36:
                val |= PIPECONF_12BPC;
                break;
        default:
                /* Case prevented by intel_choose_pipe_bpp_dither. */
                BUG();
        }

        if (intel_crtc->config.dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (intel_crtc->config.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        if (intel_crtc->config.limited_color_range)
                val |= PIPECONF_COLOR_RANGE_SELECT;

        I915_WRITE(PIPECONF(pipe), val);
        POSTING_READ(PIPECONF(pipe));
}

/*
 * Set up the pipe CSC unit.
 *
 * Currently only full range RGB to limited range RGB conversion
 * is supported, but eventually this should handle various
 * RGB<->YCbCr scenarios as well.
 */
static void intel_set_pipe_csc(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        uint16_t coeff = 0x7800; /* 1.0 */

        /*
         * TODO: Check what kind of values actually come out of the pipe
         * with these coeff/postoff values and adjust to get the best
         * accuracy. Perhaps we even need to take the bpc value into
         * consideration.
         */

        if (intel_crtc->config.limited_color_range)
                coeff = ((235 - 16) * (1 << 12) / 255) & 0xff8; /* 0.xxx... */

        /*
         * GY/GU and RY/RU should be the other way around according
         * to BSpec, but reality doesn't agree. Just set them up in
         * a way that results in the correct picture.
         */
        I915_WRITE(PIPE_CSC_COEFF_RY_GY(pipe), coeff << 16);
        I915_WRITE(PIPE_CSC_COEFF_BY(pipe), 0);

        I915_WRITE(PIPE_CSC_COEFF_RU_GU(pipe), coeff);
        I915_WRITE(PIPE_CSC_COEFF_BU(pipe), 0);

        I915_WRITE(PIPE_CSC_COEFF_RV_GV(pipe), 0);
        I915_WRITE(PIPE_CSC_COEFF_BV(pipe), coeff << 16);

        I915_WRITE(PIPE_CSC_PREOFF_HI(pipe), 0);
        I915_WRITE(PIPE_CSC_PREOFF_ME(pipe), 0);
        I915_WRITE(PIPE_CSC_PREOFF_LO(pipe), 0);

        if (INTEL_INFO(dev)->gen > 6) {
                uint16_t postoff = 0;

                if (intel_crtc->config.limited_color_range)
                        postoff = (16 * (1 << 12) / 255) & 0x1fff;

                I915_WRITE(PIPE_CSC_POSTOFF_HI(pipe), postoff);
                I915_WRITE(PIPE_CSC_POSTOFF_ME(pipe), postoff);
                I915_WRITE(PIPE_CSC_POSTOFF_LO(pipe), postoff);

                I915_WRITE(PIPE_CSC_MODE(pipe), 0);
        } else {
                uint32_t mode = CSC_MODE_YUV_TO_RGB;

                if (intel_crtc->config.limited_color_range)
                        mode |= CSC_BLACK_SCREEN_OFFSET;

                I915_WRITE(PIPE_CSC_MODE(pipe), mode);
        }
}

static void haswell_set_pipeconf(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum pipe pipe = intel_crtc->pipe;
        enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
        uint32_t val;

        val = 0;

        if (IS_HASWELL(dev) && intel_crtc->config.dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (intel_crtc->config.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        I915_WRITE(PIPECONF(cpu_transcoder), val);
        POSTING_READ(PIPECONF(cpu_transcoder));

        I915_WRITE(GAMMA_MODE(intel_crtc->pipe), GAMMA_MODE_MODE_8BIT);
        POSTING_READ(GAMMA_MODE(intel_crtc->pipe));

        if (IS_BROADWELL(dev)) {
                val = 0;

                switch (intel_crtc->config.pipe_bpp) {
                case 18:
                        val |= PIPEMISC_DITHER_6_BPC;
                        break;
                case 24:
                        val |= PIPEMISC_DITHER_8_BPC;
                        break;
                case 30:
                        val |= PIPEMISC_DITHER_10_BPC;
                        break;
                case 36:
                        val |= PIPEMISC_DITHER_12_BPC;
                        break;
                default:
                        /* Case prevented by pipe_config_set_bpp. */
                        BUG();
                }

                if (intel_crtc->config.dither)
                        val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;

                I915_WRITE(PIPEMISC(pipe), val);
        }
}

static bool ironlake_compute_clocks(struct drm_crtc *crtc,
                                    intel_clock_t *clock,
                                    bool *has_reduced_clock,
                                    intel_clock_t *reduced_clock)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_encoder *intel_encoder;
        int refclk;
        const intel_limit_t *limit;
        bool ret, is_lvds = false;

        for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
                switch (intel_encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        is_lvds = true;
                        break;
                }
        }

        refclk = ironlake_get_refclk(crtc);

        /*
         * Returns a set of divisors for the desired target clock with the given
         * refclk, or FALSE.  The returned values represent the clock equation:
         * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
         */
        limit = intel_limit(crtc, refclk);
        ret = dev_priv->display.find_dpll(limit, crtc,
                                          to_intel_crtc(crtc)->config.port_clock,
                                          refclk, NULL, clock);
        if (!ret)
                return false;

        if (is_lvds && dev_priv->lvds_downclock_avail) {
                /*
                 * Ensure we match the reduced clock's P to the target clock.
                 * If the clocks don't match, we can't switch the display clock
                 * by using the FP0/FP1. In such case we will disable the LVDS
                 * downclock feature.
                */
                *has_reduced_clock =
                        dev_priv->display.find_dpll(limit, crtc,
                                                    dev_priv->lvds_downclock,
                                                    refclk, clock,
                                                    reduced_clock);
        }

        return true;
}

int ironlake_get_lanes_required(int target_clock, int link_bw, int bpp)
{
        /*
         * Account for spread spectrum to avoid
         * oversubscribing the link. Max center spread
         * is 2.5%; use 5% for safety's sake.
         */
        u32 bps = target_clock * bpp * 21 / 20;
        return DIV_ROUND_UP(bps, link_bw * 8);
}

static bool ironlake_needs_fb_cb_tune(struct dpll *dpll, int factor)
{
        return i9xx_dpll_compute_m(dpll) < factor * dpll->n;
}

static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
                                      u32 *fp,
                                      intel_clock_t *reduced_clock, u32 *fp2)
{
        struct drm_crtc *crtc = &intel_crtc->base;
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_encoder *intel_encoder;
        uint32_t dpll;
        int factor, num_connectors = 0;
        bool is_lvds = false, is_sdvo = false;

        for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
                switch (intel_encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        is_lvds = true;
                        break;
                case INTEL_OUTPUT_SDVO:
                case INTEL_OUTPUT_HDMI:
                        is_sdvo = true;
                        break;
                }

                num_connectors++;
        }

        /* Enable autotuning of the PLL clock (if permissible) */
        factor = 21;
        if (is_lvds) {
                if ((intel_panel_use_ssc(dev_priv) &&
                     dev_priv->vbt.lvds_ssc_freq == 100000) ||
                    (HAS_PCH_IBX(dev) && intel_is_dual_link_lvds(dev)))
                        factor = 25;
        } else if (intel_crtc->config.sdvo_tv_clock)
                factor = 20;

        if (ironlake_needs_fb_cb_tune(&intel_crtc->config.dpll, factor))
                *fp |= FP_CB_TUNE;

        if (fp2 && (reduced_clock->m < factor * reduced_clock->n))
                *fp2 |= FP_CB_TUNE;

        dpll = 0;

        if (is_lvds)
                dpll |= DPLLB_MODE_LVDS;
        else
                dpll |= DPLLB_MODE_DAC_SERIAL;

        dpll |= (intel_crtc->config.pixel_multiplier - 1)
                << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;

        if (is_sdvo)
                dpll |= DPLL_SDVO_HIGH_SPEED;
        if (intel_crtc->config.has_dp_encoder)
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /* compute bitmask from p1 value */
        dpll |= (1 << (intel_crtc->config.dpll.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
        /* also FPA1 */
        dpll |= (1 << (intel_crtc->config.dpll.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;

        switch (intel_crtc->config.dpll.p2) {
        case 5:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                break;
        case 7:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                break;
        case 10:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                break;
        case 14:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                break;
        }

        if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2)
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        return dpll | DPLL_VCO_ENABLE;
}

static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
                                  int x, int y,
                                  struct drm_framebuffer *fb)
{
        struct drm_device *dev = crtc->dev;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int num_connectors = 0;
        intel_clock_t clock, reduced_clock;
        u32 dpll = 0, fp = 0, fp2 = 0;
        bool ok, has_reduced_clock = false;
        bool is_lvds = false;
        struct intel_encoder *encoder;
        struct intel_shared_dpll *pll;

        for_each_encoder_on_crtc(dev, crtc, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        is_lvds = true;
                        break;
                }

                num_connectors++;
        }

        WARN(!(HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)),
             "Unexpected PCH type %d\n", INTEL_PCH_TYPE(dev));

        ok = ironlake_compute_clocks(crtc, &clock,
                                     &has_reduced_clock, &reduced_clock);
        if (!ok && !intel_crtc->config.clock_set) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }
        /* Compat-code for transition, will disappear. */
        if (!intel_crtc->config.clock_set) {
                intel_crtc->config.dpll.n = clock.n;
                intel_crtc->config.dpll.m1 = clock.m1;
                intel_crtc->config.dpll.m2 = clock.m2;
                intel_crtc->config.dpll.p1 = clock.p1;
                intel_crtc->config.dpll.p2 = clock.p2;
        }

        /* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
        if (intel_crtc->config.has_pch_encoder) {
                fp = i9xx_dpll_compute_fp(&intel_crtc->config.dpll);
                if (has_reduced_clock)
                        fp2 = i9xx_dpll_compute_fp(&reduced_clock);

                dpll = ironlake_compute_dpll(intel_crtc,
                                             &fp, &reduced_clock,
                                             has_reduced_clock ? &fp2 : NULL);

                intel_crtc->config.dpll_hw_state.dpll = dpll;
                intel_crtc->config.dpll_hw_state.fp0 = fp;
                if (has_reduced_clock)
                        intel_crtc->config.dpll_hw_state.fp1 = fp2;
                else
                        intel_crtc->config.dpll_hw_state.fp1 = fp;

                pll = intel_get_shared_dpll(intel_crtc);
                if (pll == NULL) {
                        DRM_DEBUG_DRIVER("failed to find PLL for pipe %c\n",
                                         pipe_name(intel_crtc->pipe));
                        return -EINVAL;
                }
        } else
                intel_put_shared_dpll(intel_crtc);

        if (is_lvds && has_reduced_clock && i915.powersave)
                intel_crtc->lowfreq_avail = true;
        else
                intel_crtc->lowfreq_avail = false;

        return 0;
}

static void intel_pch_transcoder_get_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum pipe pipe = crtc->pipe;

        m_n->link_m = I915_READ(PCH_TRANS_LINK_M1(pipe));
        m_n->link_n = I915_READ(PCH_TRANS_LINK_N1(pipe));
        m_n->gmch_m = I915_READ(PCH_TRANS_DATA_M1(pipe))
                & ~TU_SIZE_MASK;
        m_n->gmch_n = I915_READ(PCH_TRANS_DATA_N1(pipe));
        m_n->tu = ((I915_READ(PCH_TRANS_DATA_M1(pipe))
                    & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
}

static void intel_cpu_transcoder_get_m_n(struct intel_crtc *crtc,
                                         enum transcoder transcoder,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum pipe pipe = crtc->pipe;

        if (INTEL_INFO(dev)->gen >= 5) {
                m_n->link_m = I915_READ(PIPE_LINK_M1(transcoder));
                m_n->link_n = I915_READ(PIPE_LINK_N1(transcoder));
                m_n->gmch_m = I915_READ(PIPE_DATA_M1(transcoder))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = I915_READ(PIPE_DATA_N1(transcoder));
                m_n->tu = ((I915_READ(PIPE_DATA_M1(transcoder))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
        } else {
                m_n->link_m = I915_READ(PIPE_LINK_M_G4X(pipe));
                m_n->link_n = I915_READ(PIPE_LINK_N_G4X(pipe));
                m_n->gmch_m = I915_READ(PIPE_DATA_M_G4X(pipe))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = I915_READ(PIPE_DATA_N_G4X(pipe));
                m_n->tu = ((I915_READ(PIPE_DATA_M_G4X(pipe))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
        }
}

void intel_dp_get_m_n(struct intel_crtc *crtc,
                      struct intel_crtc_config *pipe_config)
{
        if (crtc->config.has_pch_encoder)
                intel_pch_transcoder_get_m_n(crtc, &pipe_config->dp_m_n);
        else
                intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                             &pipe_config->dp_m_n);
}

static void ironlake_get_fdi_m_n_config(struct intel_crtc *crtc,
                                        struct intel_crtc_config *pipe_config)
{
        intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                     &pipe_config->fdi_m_n);
}

static void ironlake_get_pfit_config(struct intel_crtc *crtc,
                                     struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t tmp;

        tmp = I915_READ(PF_CTL(crtc->pipe));

        if (tmp & PF_ENABLE) {
                pipe_config->pch_pfit.enabled = true;
                pipe_config->pch_pfit.pos = I915_READ(PF_WIN_POS(crtc->pipe));
                pipe_config->pch_pfit.size = I915_READ(PF_WIN_SZ(crtc->pipe));

                /* We currently do not free assignements of panel fitters on
                 * ivb/hsw (since we don't use the higher upscaling modes which
                 * differentiates them) so just WARN about this case for now. */
                if (IS_GEN7(dev)) {
                        WARN_ON((tmp & PF_PIPE_SEL_MASK_IVB) !=
                                PF_PIPE_SEL_IVB(crtc->pipe));
                }
        }
}

static void ironlake_get_plane_config(struct intel_crtc *crtc,
                                      struct intel_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 val, base, offset;
        int pipe = crtc->pipe, plane = crtc->plane;
        int fourcc, pixel_format;
        int aligned_height;

        crtc->base.primary->fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
        if (!crtc->base.primary->fb) {
                DRM_DEBUG_KMS("failed to alloc fb\n");
                return;
        }

        val = I915_READ(DSPCNTR(plane));

        if (INTEL_INFO(dev)->gen >= 4)
                if (val & DISPPLANE_TILED)
                        plane_config->tiled = true;

        pixel_format = val & DISPPLANE_PIXFORMAT_MASK;
        fourcc = intel_format_to_fourcc(pixel_format);
        crtc->base.primary->fb->pixel_format = fourcc;
        crtc->base.primary->fb->bits_per_pixel =
                drm_format_plane_cpp(fourcc, 0) * 8;

        base = I915_READ(DSPSURF(plane)) & 0xfffff000;
        if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
                offset = I915_READ(DSPOFFSET(plane));
        } else {
                if (plane_config->tiled)
                        offset = I915_READ(DSPTILEOFF(plane));
                else
                        offset = I915_READ(DSPLINOFF(plane));
        }
        plane_config->base = base;

        val = I915_READ(PIPESRC(pipe));
        crtc->base.primary->fb->width = ((val >> 16) & 0xfff) + 1;
        crtc->base.primary->fb->height = ((val >> 0) & 0xfff) + 1;

        val = I915_READ(DSPSTRIDE(pipe));
        crtc->base.primary->fb->pitches[0] = val & 0xffffff80;

        aligned_height = intel_align_height(dev, crtc->base.primary->fb->height,
                                            plane_config->tiled);

        plane_config->size = ALIGN(crtc->base.primary->fb->pitches[0] *
                                   aligned_height, PAGE_SIZE);

        DRM_DEBUG_KMS("pipe/plane %d/%d with fb: size=%dx%d@%d, offset=%x, pitch %d, size 0x%x\n",
                      pipe, plane, crtc->base.primary->fb->width,
                      crtc->base.primary->fb->height,
                      crtc->base.primary->fb->bits_per_pixel, base,
                      crtc->base.primary->fb->pitches[0],
                      plane_config->size);
}

static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
                                     struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t tmp;

        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = DPLL_ID_PRIVATE;

        tmp = I915_READ(PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                return false;

        switch (tmp & PIPECONF_BPC_MASK) {
        case PIPECONF_6BPC:
                pipe_config->pipe_bpp = 18;
                break;
        case PIPECONF_8BPC:
                pipe_config->pipe_bpp = 24;
                break;
        case PIPECONF_10BPC:
                pipe_config->pipe_bpp = 30;
                break;
        case PIPECONF_12BPC:
                pipe_config->pipe_bpp = 36;
                break;
        default:
                break;
        }

        if (tmp & PIPECONF_COLOR_RANGE_SELECT)
                pipe_config->limited_color_range = true;

        if (I915_READ(PCH_TRANSCONF(crtc->pipe)) & TRANS_ENABLE) {
                struct intel_shared_dpll *pll;

                pipe_config->has_pch_encoder = true;

                tmp = I915_READ(FDI_RX_CTL(crtc->pipe));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ironlake_get_fdi_m_n_config(crtc, pipe_config);

                if (HAS_PCH_IBX(dev_priv->dev)) {
                        pipe_config->shared_dpll =
                                (enum intel_dpll_id) crtc->pipe;
                } else {
                        tmp = I915_READ(PCH_DPLL_SEL);
                        if (tmp & TRANS_DPLLB_SEL(crtc->pipe))
                                pipe_config->shared_dpll = DPLL_ID_PCH_PLL_B;
                        else
                                pipe_config->shared_dpll = DPLL_ID_PCH_PLL_A;
                }

                pll = &dev_priv->shared_dplls[pipe_config->shared_dpll];

                WARN_ON(!pll->get_hw_state(dev_priv, pll,
                                           &pipe_config->dpll_hw_state));

                tmp = pipe_config->dpll_hw_state.dpll;
                pipe_config->pixel_multiplier =
                        ((tmp & PLL_REF_SDVO_HDMI_MULTIPLIER_MASK)
                         >> PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT) + 1;

                ironlake_pch_clock_get(crtc, pipe_config);
        } else {
                pipe_config->pixel_multiplier = 1;
        }

        intel_get_pipe_timings(crtc, pipe_config);

        ironlake_get_pfit_config(crtc, pipe_config);

        return true;
}

static void assert_can_disable_lcpll(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        struct intel_ddi_plls *plls = &dev_priv->ddi_plls;
        struct intel_crtc *crtc;

        for_each_intel_crtc(dev, crtc)
                WARN(crtc->active, "CRTC for pipe %c enabled\n",
                     pipe_name(crtc->pipe));

        WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on\n");
        WARN(plls->spll_refcount, "SPLL enabled\n");
        WARN(plls->wrpll1_refcount, "WRPLL1 enabled\n");
        WARN(plls->wrpll2_refcount, "WRPLL2 enabled\n");
        WARN(I915_READ(PCH_PP_STATUS) & PP_ON, "Panel power on\n");
        WARN(I915_READ(BLC_PWM_CPU_CTL2) & BLM_PWM_ENABLE,
             "CPU PWM1 enabled\n");
        WARN(I915_READ(HSW_BLC_PWM2_CTL) & BLM_PWM_ENABLE,
             "CPU PWM2 enabled\n");
        WARN(I915_READ(BLC_PWM_PCH_CTL1) & BLM_PCH_PWM_ENABLE,
             "PCH PWM1 enabled\n");
        WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
             "Utility pin enabled\n");
        WARN(I915_READ(PCH_GTC_CTL) & PCH_GTC_ENABLE, "PCH GTC enabled\n");

        /*
         * In theory we can still leave IRQs enabled, as long as only the HPD
         * interrupts remain enabled. We used to check for that, but since it's
         * gen-specific and since we only disable LCPLL after we fully disable
         * the interrupts, the check below should be enough.
         */
        WARN(!dev_priv->pm.irqs_disabled, "IRQs enabled\n");
}

static void hsw_write_dcomp(struct drm_i915_private *dev_priv, uint32_t val)
{
        struct drm_device *dev = dev_priv->dev;

        if (IS_HASWELL(dev)) {
                mutex_lock(&dev_priv->rps.hw_lock);
                if (sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_D_COMP,
                                            val))
                        DRM_ERROR("Failed to disable D_COMP\n");
                mutex_unlock(&dev_priv->rps.hw_lock);
        } else {
                I915_WRITE(D_COMP, val);
        }
        POSTING_READ(D_COMP);
}

/*
 * This function implements pieces of two sequences from BSpec:
 * - Sequence for display software to disable LCPLL
 * - Sequence for display software to allow package C8+
 * The steps implemented here are just the steps that actually touch the LCPLL
 * register. Callers should take care of disabling all the display engine
 * functions, doing the mode unset, fixing interrupts, etc.
 */
static void hsw_disable_lcpll(struct drm_i915_private *dev_priv,
                              bool switch_to_fclk, bool allow_power_down)
{
        uint32_t val;

        assert_can_disable_lcpll(dev_priv);

        val = I915_READ(LCPLL_CTL);

        if (switch_to_fclk) {
                val |= LCPLL_CD_SOURCE_FCLK;
                I915_WRITE(LCPLL_CTL, val);

                if (wait_for_atomic_us(I915_READ(LCPLL_CTL) &
                                       LCPLL_CD_SOURCE_FCLK_DONE, 1))
                        DRM_ERROR("Switching to FCLK failed\n");

                val = I915_READ(LCPLL_CTL);
        }

        val |= LCPLL_PLL_DISABLE;
        I915_WRITE(LCPLL_CTL, val);
        POSTING_READ(LCPLL_CTL);

        if (wait_for((I915_READ(LCPLL_CTL) & LCPLL_PLL_LOCK) == 0, 1))
                DRM_ERROR("LCPLL still locked\n");

        val = I915_READ(D_COMP);
        val |= D_COMP_COMP_DISABLE;
        hsw_write_dcomp(dev_priv, val);
        ndelay(100);

        if (wait_for((I915_READ(D_COMP) & D_COMP_RCOMP_IN_PROGRESS) == 0, 1))
                DRM_ERROR("D_COMP RCOMP still in progress\n");

        if (allow_power_down) {
                val = I915_READ(LCPLL_CTL);
                val |= LCPLL_POWER_DOWN_ALLOW;
                I915_WRITE(LCPLL_CTL, val);
                POSTING_READ(LCPLL_CTL);
        }
}

/*
 * Fully restores LCPLL, disallowing power down and switching back to LCPLL
 * source.
 */
static void hsw_restore_lcpll(struct drm_i915_private *dev_priv)
{
        uint32_t val;
        unsigned long irqflags;

        val = I915_READ(LCPLL_CTL);

        if ((val & (LCPLL_PLL_LOCK | LCPLL_PLL_DISABLE | LCPLL_CD_SOURCE_FCLK |
                    LCPLL_POWER_DOWN_ALLOW)) == LCPLL_PLL_LOCK)
                return;

        /*
         * Make sure we're not on PC8 state before disabling PC8, otherwise
         * we'll hang the machine. To prevent PC8 state, just enable force_wake.
         *
         * The other problem is that hsw_restore_lcpll() is called as part of
         * the runtime PM resume sequence, so we can't just call
         * gen6_gt_force_wake_get() because that function calls
         * intel_runtime_pm_get(), and we can't change the runtime PM refcount
         * while we are on the resume sequence. So to solve this problem we have
         * to call special forcewake code that doesn't touch runtime PM and
         * doesn't enable the forcewake delayed work.
         */
        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
        if (dev_priv->uncore.forcewake_count++ == 0)
                dev_priv->uncore.funcs.force_wake_get(dev_priv, FORCEWAKE_ALL);
        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

        if (val & LCPLL_POWER_DOWN_ALLOW) {
                val &= ~LCPLL_POWER_DOWN_ALLOW;
                I915_WRITE(LCPLL_CTL, val);
                POSTING_READ(LCPLL_CTL);
        }

        val = I915_READ(D_COMP);
        val |= D_COMP_COMP_FORCE;
        val &= ~D_COMP_COMP_DISABLE;
        hsw_write_dcomp(dev_priv, val);

        val = I915_READ(LCPLL_CTL);
        val &= ~LCPLL_PLL_DISABLE;
        I915_WRITE(LCPLL_CTL, val);

        if (wait_for(I915_READ(LCPLL_CTL) & LCPLL_PLL_LOCK, 5))
                DRM_ERROR("LCPLL not locked yet\n");

        if (val & LCPLL_CD_SOURCE_FCLK) {
                val = I915_READ(LCPLL_CTL);
                val &= ~LCPLL_CD_SOURCE_FCLK;
                I915_WRITE(LCPLL_CTL, val);

                if (wait_for_atomic_us((I915_READ(LCPLL_CTL) &
                                        LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
                        DRM_ERROR("Switching back to LCPLL failed\n");
        }

        /* See the big comment above. */
        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
        if (--dev_priv->uncore.forcewake_count == 0)
                dev_priv->uncore.funcs.force_wake_put(dev_priv, FORCEWAKE_ALL);
        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

/*
 * Package states C8 and deeper are really deep PC states that can only be
 * reached when all the devices on the system allow it, so even if the graphics
 * device allows PC8+, it doesn't mean the system will actually get to these
 * states. Our driver only allows PC8+ when going into runtime PM.
 *
 * The requirements for PC8+ are that all the outputs are disabled, the power
 * well is disabled and most interrupts are disabled, and these are also
 * requirements for runtime PM. When these conditions are met, we manually do
 * the other conditions: disable the interrupts, clocks and switch LCPLL refclk
 * to Fclk. If we're in PC8+ and we get an non-hotplug interrupt, we can hard
 * hang the machine.
 *
 * When we really reach PC8 or deeper states (not just when we allow it) we lose
 * the state of some registers, so when we come back from PC8+ we need to
 * restore this state. We don't get into PC8+ if we're not in RC6, so we don't
 * need to take care of the registers kept by RC6. Notice that this happens even
 * if we don't put the device in PCI D3 state (which is what currently happens
 * because of the runtime PM support).
 *
 * For more, read "Display Sequences for Package C8" on the hardware
 * documentation.
 */
void hsw_enable_pc8(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        uint32_t val;

        DRM_DEBUG_KMS("Enabling package C8+\n");

        if (dev_priv->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE) {
                val = I915_READ(SOUTH_DSPCLK_GATE_D);
                val &= ~PCH_LP_PARTITION_LEVEL_DISABLE;
                I915_WRITE(SOUTH_DSPCLK_GATE_D, val);
        }

        lpt_disable_clkout_dp(dev);
        hsw_disable_lcpll(dev_priv, true, true);
}

void hsw_disable_pc8(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        uint32_t val;

        DRM_DEBUG_KMS("Disabling package C8+\n");

        hsw_restore_lcpll(dev_priv);
        lpt_init_pch_refclk(dev);

        if (dev_priv->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE) {
                val = I915_READ(SOUTH_DSPCLK_GATE_D);
                val |= PCH_LP_PARTITION_LEVEL_DISABLE;
                I915_WRITE(SOUTH_DSPCLK_GATE_D, val);
        }

        intel_prepare_ddi(dev);
}

static void snb_modeset_global_resources(struct drm_device *dev)
{
        modeset_update_crtc_power_domains(dev);
}

static void haswell_modeset_global_resources(struct drm_device *dev)
{
        modeset_update_crtc_power_domains(dev);
}

static int haswell_crtc_mode_set(struct drm_crtc *crtc,
                                 int x, int y,
                                 struct drm_framebuffer *fb)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        if (!intel_ddi_pll_select(intel_crtc))
                return -EINVAL;
        intel_ddi_pll_enable(intel_crtc);

        intel_crtc->lowfreq_avail = false;

        return 0;
}

static bool haswell_get_pipe_config(struct intel_crtc *crtc,
                                    struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum intel_display_power_domain pfit_domain;
        uint32_t tmp;

        if (!intel_display_power_enabled(dev_priv,
                                         POWER_DOMAIN_PIPE(crtc->pipe)))
                return false;

        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = DPLL_ID_PRIVATE;

        tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));
        if (tmp & TRANS_DDI_FUNC_ENABLE) {
                enum pipe trans_edp_pipe;
                switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
                default:
                        WARN(1, "unknown pipe linked to edp transcoder\n");
                case TRANS_DDI_EDP_INPUT_A_ONOFF:
                case TRANS_DDI_EDP_INPUT_A_ON:
                        trans_edp_pipe = PIPE_A;
                        break;
                case TRANS_DDI_EDP_INPUT_B_ONOFF:
                        trans_edp_pipe = PIPE_B;
                        break;
                case TRANS_DDI_EDP_INPUT_C_ONOFF:
                        trans_edp_pipe = PIPE_C;
                        break;
                }

                if (trans_edp_pipe == crtc->pipe)
                        pipe_config->cpu_transcoder = TRANSCODER_EDP;
        }

        if (!intel_display_power_enabled(dev_priv,
                        POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder)))
                return false;

        tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
        if (!(tmp & PIPECONF_ENABLE))
                return false;

        /*
         * Haswell has only FDI/PCH transcoder A. It is which is connected to
         * DDI E. So just check whether this pipe is wired to DDI E and whether
         * the PCH transcoder is on.
         */
        tmp = I915_READ(TRANS_DDI_FUNC_CTL(pipe_config->cpu_transcoder));
        if ((tmp & TRANS_DDI_PORT_MASK) == TRANS_DDI_SELECT_PORT(PORT_E) &&
            I915_READ(LPT_TRANSCONF) & TRANS_ENABLE) {
                pipe_config->has_pch_encoder = true;

                tmp = I915_READ(FDI_RX_CTL(PIPE_A));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ironlake_get_fdi_m_n_config(crtc, pipe_config);
        }

        intel_get_pipe_timings(crtc, pipe_config);

        pfit_domain = POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe);
        if (intel_display_power_enabled(dev_priv, pfit_domain))
                ironlake_get_pfit_config(crtc, pipe_config);

        if (IS_HASWELL(dev))
                pipe_config->ips_enabled = hsw_crtc_supports_ips(crtc) &&
                        (I915_READ(IPS_CTL) & IPS_ENABLE);

        pipe_config->pixel_multiplier = 1;

        return true;
}

static struct {
        int clock;
        u32 config;
} hdmi_audio_clock[] = {
        { DIV_ROUND_UP(25200 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_25175 },
        { 25200, AUD_CONFIG_PIXEL_CLOCK_HDMI_25200 }, /* default per bspec */
        { 27000, AUD_CONFIG_PIXEL_CLOCK_HDMI_27000 },
        { 27000 * 1001 / 1000, AUD_CONFIG_PIXEL_CLOCK_HDMI_27027 },
        { 54000, AUD_CONFIG_PIXEL_CLOCK_HDMI_54000 },
        { 54000 * 1001 / 1000, AUD_CONFIG_PIXEL_CLOCK_HDMI_54054 },
        { DIV_ROUND_UP(74250 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_74176 },
        { 74250, AUD_CONFIG_PIXEL_CLOCK_HDMI_74250 },
        { DIV_ROUND_UP(148500 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_148352 },
        { 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
};

/* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(hdmi_audio_clock); i++) {
                if (mode->clock == hdmi_audio_clock[i].clock)
                        break;
        }

        if (i == ARRAY_SIZE(hdmi_audio_clock)) {
                DRM_DEBUG_KMS("HDMI audio pixel clock setting for %d not found, falling back to defaults\n", mode->clock);
                i = 1;
        }

        DRM_DEBUG_KMS("Configuring HDMI audio for pixel clock %d (0x%08x)\n",
                      hdmi_audio_clock[i].clock,
                      hdmi_audio_clock[i].config);

        return hdmi_audio_clock[i].config;
}

static bool intel_eld_uptodate(struct drm_connector *connector,
                               int reg_eldv, uint32_t bits_eldv,
                               int reg_elda, uint32_t bits_elda,
                               int reg_edid)
{
        struct drm_i915_private *dev_priv = connector->dev->dev_private;
        uint8_t *eld = connector->eld;
        uint32_t i;

        i = I915_READ(reg_eldv);
        i &= bits_eldv;

        if (!eld[0])
                return !i;

        if (!i)
                return false;

        i = I915_READ(reg_elda);
        i &= ~bits_elda;
        I915_WRITE(reg_elda, i);

        for (i = 0; i < eld[2]; i++)
                if (I915_READ(reg_edid) != *((uint32_t *)eld + i))
                        return false;

        return true;
}

static void g4x_write_eld(struct drm_connector *connector,
                          struct drm_crtc *crtc,
                          struct drm_display_mode *mode)
{
        struct drm_i915_private *dev_priv = connector->dev->dev_private;
        uint8_t *eld = connector->eld;
        uint32_t eldv;
        uint32_t len;
        uint32_t i;

        i = I915_READ(G4X_AUD_VID_DID);

        if (i == INTEL_AUDIO_DEVBLC || i == INTEL_AUDIO_DEVCL)
                eldv = G4X_ELDV_DEVCL_DEVBLC;
        else
                eldv = G4X_ELDV_DEVCTG;

        if (intel_eld_uptodate(connector,
                               G4X_AUD_CNTL_ST, eldv,
                               G4X_AUD_CNTL_ST, G4X_ELD_ADDR,
                               G4X_HDMIW_HDMIEDID))
                return;

        i = I915_READ(G4X_AUD_CNTL_ST);
        i &= ~(eldv | G4X_ELD_ADDR);
        len = (i >> 9) & 0x1f;          /* ELD buffer size */
        I915_WRITE(G4X_AUD_CNTL_ST, i);

        if (!eld[0])
                return;

        len = min_t(uint8_t, eld[2], len);
        DRM_DEBUG_DRIVER("ELD size %d\n", len);
        for (i = 0; i < len; i++)
                I915_WRITE(G4X_HDMIW_HDMIEDID, *((uint32_t *)eld + i));

        i = I915_READ(G4X_AUD_CNTL_ST);
        i |= eldv;
        I915_WRITE(G4X_AUD_CNTL_ST, i);
}

static void haswell_write_eld(struct drm_connector *connector,
                              struct drm_crtc *crtc,
                              struct drm_display_mode *mode)
{
        struct drm_i915_private *dev_priv = connector->dev->dev_private;
        uint8_t *eld = connector->eld;
        uint32_t eldv;
        uint32_t i;
        int len;
        int pipe = to_intel_crtc(crtc)->pipe;
        int tmp;

        int hdmiw_hdmiedid = HSW_AUD_EDID_DATA(pipe);
        int aud_cntl_st = HSW_AUD_DIP_ELD_CTRL(pipe);
        int aud_config = HSW_AUD_CFG(pipe);
        int aud_cntrl_st2 = HSW_AUD_PIN_ELD_CP_VLD;

        /* Audio output enable */
        DRM_DEBUG_DRIVER("HDMI audio: enable codec\n");
        tmp = I915_READ(aud_cntrl_st2);
        tmp |= (AUDIO_OUTPUT_ENABLE_A << (pipe * 4));
        I915_WRITE(aud_cntrl_st2, tmp);
        POSTING_READ(aud_cntrl_st2);

        assert_pipe_disabled(dev_priv, to_intel_crtc(crtc)->pipe);

        /* Set ELD valid state */
        tmp = I915_READ(aud_cntrl_st2);
        DRM_DEBUG_DRIVER("HDMI audio: pin eld vld status=0x%08x\n", tmp);
        tmp |= (AUDIO_ELD_VALID_A << (pipe * 4));
        I915_WRITE(aud_cntrl_st2, tmp);
        tmp = I915_READ(aud_cntrl_st2);
        DRM_DEBUG_DRIVER("HDMI audio: eld vld status=0x%08x\n", tmp);

        /* Enable HDMI mode */
        tmp = I915_READ(aud_config);
        DRM_DEBUG_DRIVER("HDMI audio: audio conf: 0x%08x\n", tmp);
        /* clear N_programing_enable and N_value_index */
        tmp &= ~(AUD_CONFIG_N_VALUE_INDEX | AUD_CONFIG_N_PROG_ENABLE);
        I915_WRITE(aud_config, tmp);

        DRM_DEBUG_DRIVER("ELD on pipe %c\n", pipe_name(pipe));

        eldv = AUDIO_ELD_VALID_A << (pipe * 4);

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
                DRM_DEBUG_DRIVER("ELD: DisplayPort detected\n");
                eld[5] |= (1 << 2);     /* Conn_Type, 0x1 = DisplayPort */
                I915_WRITE(aud_config, AUD_CONFIG_N_VALUE_INDEX); /* 0x1 = DP */
        } else {
                I915_WRITE(aud_config, audio_config_hdmi_pixel_clock(mode));
        }

        if (intel_eld_uptodate(connector,
                               aud_cntrl_st2, eldv,
                               aud_cntl_st, IBX_ELD_ADDRESS,
                               hdmiw_hdmiedid))
                return;

        i = I915_READ(aud_cntrl_st2);
        i &= ~eldv;
        I915_WRITE(aud_cntrl_st2, i);

        if (!eld[0])
                return;

        i = I915_READ(aud_cntl_st);
        i &= ~IBX_ELD_ADDRESS;
        I915_WRITE(aud_cntl_st, i);
        i = (i >> 29) & DIP_PORT_SEL_MASK;              /* DIP_Port_Select, 0x1 = PortB */
        DRM_DEBUG_DRIVER("port num:%d\n", i);

        len = min_t(uint8_t, eld[2], 21);       /* 84 bytes of hw ELD buffer */
        DRM_DEBUG_DRIVER("ELD size %d\n", len);
        for (i = 0; i < len; i++)
                I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));

        i = I915_READ(aud_cntrl_st2);
        i |= eldv;
        I915_WRITE(aud_cntrl_st2, i);

}

static void ironlake_write_eld(struct drm_connector *connector,
                               struct drm_crtc *crtc,
                               struct drm_display_mode *mode)
{
        struct drm_i915_private *dev_priv = connector->dev->dev_private;
        uint8_t *eld = connector->eld;
        uint32_t eldv;
        uint32_t i;
        int len;
        int hdmiw_hdmiedid;
        int aud_config;
        int aud_cntl_st;
        int aud_cntrl_st2;
        int pipe = to_intel_crtc(crtc)->pipe;

        if (HAS_PCH_IBX(connector->dev)) {
                hdmiw_hdmiedid = IBX_HDMIW_HDMIEDID(pipe);
                aud_config = IBX_AUD_CFG(pipe);
                aud_cntl_st = IBX_AUD_CNTL_ST(pipe);
                aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
        } else if (IS_VALLEYVIEW(connector->dev)) {
                hdmiw_hdmiedid = VLV_HDMIW_HDMIEDID(pipe);
                aud_config = VLV_AUD_CFG(pipe);
                aud_cntl_st = VLV_AUD_CNTL_ST(pipe);
                aud_cntrl_st2 = VLV_AUD_CNTL_ST2;
        } else {
                hdmiw_hdmiedid = CPT_HDMIW_HDMIEDID(pipe);
                aud_config = CPT_AUD_CFG(pipe);
                aud_cntl_st = CPT_AUD_CNTL_ST(pipe);
                aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
        }

        DRM_DEBUG_DRIVER("ELD on pipe %c\n", pipe_name(pipe));

        if (IS_VALLEYVIEW(connector->dev))  {
                struct intel_encoder *intel_encoder;
                struct intel_digital_port *intel_dig_port;

                intel_encoder = intel_attached_encoder(connector);
                intel_dig_port = enc_to_dig_port(&intel_encoder->base);
                i = intel_dig_port->port;
        } else {
                i = I915_READ(aud_cntl_st);
                i = (i >> 29) & DIP_PORT_SEL_MASK;
                /* DIP_Port_Select, 0x1 = PortB */
        }

        if (!i) {
                DRM_DEBUG_DRIVER("Audio directed to unknown port\n");
                /* operate blindly on all ports */
                eldv = IBX_ELD_VALIDB;
                eldv |= IBX_ELD_VALIDB << 4;
                eldv |= IBX_ELD_VALIDB << 8;
        } else {
                DRM_DEBUG_DRIVER("ELD on port %c\n", port_name(i));
                eldv = IBX_ELD_VALIDB << ((i - 1) * 4);
        }

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
                DRM_DEBUG_DRIVER("ELD: DisplayPort detected\n");
                eld[5] |= (1 << 2);     /* Conn_Type, 0x1 = DisplayPort */
                I915_WRITE(aud_config, AUD_CONFIG_N_VALUE_INDEX); /* 0x1 = DP */
        } else {
                I915_WRITE(aud_config, audio_config_hdmi_pixel_clock(mode));
        }

        if (intel_eld_uptodate(connector,
                               aud_cntrl_st2, eldv,
                               aud_cntl_st, IBX_ELD_ADDRESS,
                               hdmiw_hdmiedid))
                return;

        i = I915_READ(aud_cntrl_st2);
        i &= ~eldv;
        I915_WRITE(aud_cntrl_st2, i);

        if (!eld[0])
                return;

        i = I915_READ(aud_cntl_st);
        i &= ~IBX_ELD_ADDRESS;
        I915_WRITE(aud_cntl_st, i);

        len = min_t(uint8_t, eld[2], 21);       /* 84 bytes of hw ELD buffer */
        DRM_DEBUG_DRIVER("ELD size %d\n", len);
        for (i = 0; i < len; i++)
                I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));

        i = I915_READ(aud_cntrl_st2);
        i |= eldv;
        I915_WRITE(aud_cntrl_st2, i);
}

void intel_write_eld(struct drm_encoder *encoder,
                     struct drm_display_mode *mode)
{
        struct drm_crtc *crtc = encoder->crtc;
        struct drm_connector *connector;
        struct drm_device *dev = encoder->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        connector = drm_select_eld(encoder, mode);
        if (!connector)
                return;

        DRM_DEBUG_DRIVER("ELD on [CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                         connector->base.id,
                         connector->name,
                         connector->encoder->base.id,
                         connector->encoder->name);

        connector->eld[6] = drm_av_sync_delay(connector, mode) / 2;

        if (dev_priv->display.write_eld)
                dev_priv->display.write_eld(connector, crtc, mode);
}

static void i845_update_cursor(struct drm_crtc *crtc, u32 base)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        uint32_t cntl;

        if (base != intel_crtc->cursor_base) {
                /* On these chipsets we can only modify the base whilst
                 * the cursor is disabled.
                 */
                if (intel_crtc->cursor_cntl) {
                        I915_WRITE(_CURACNTR, 0);
                        POSTING_READ(_CURACNTR);
                        intel_crtc->cursor_cntl = 0;
                }

                I915_WRITE(_CURABASE, base);
                POSTING_READ(_CURABASE);
        }

        /* XXX width must be 64, stride 256 => 0x00 << 28 */
        cntl = 0;
        if (base)
                cntl = (CURSOR_ENABLE |
                        CURSOR_GAMMA_ENABLE |
                        CURSOR_FORMAT_ARGB);
        if (intel_crtc->cursor_cntl != cntl) {
                I915_WRITE(_CURACNTR, cntl);
                POSTING_READ(_CURACNTR);
                intel_crtc->cursor_cntl = cntl;
        }
}

static void i9xx_update_cursor(struct drm_crtc *crtc, u32 base)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        uint32_t cntl;

        cntl = 0;
        if (base) {
                cntl = MCURSOR_GAMMA_ENABLE;
                switch (intel_crtc->cursor_width) {
                        case 64:
                                cntl |= CURSOR_MODE_64_ARGB_AX;
                                break;
                        case 128:
                                cntl |= CURSOR_MODE_128_ARGB_AX;
                                break;
                        case 256:
                                cntl |= CURSOR_MODE_256_ARGB_AX;
                                break;
                        default:
                                WARN_ON(1);
                                return;
                }
                cntl |= pipe << 28; /* Connect to correct pipe */
        }
        if (intel_crtc->cursor_cntl != cntl) {
                I915_WRITE(CURCNTR(pipe), cntl);
                POSTING_READ(CURCNTR(pipe));
                intel_crtc->cursor_cntl = cntl;
        }

        /* and commit changes on next vblank */
        I915_WRITE(CURBASE(pipe), base);
        POSTING_READ(CURBASE(pipe));
}

static void ivb_update_cursor(struct drm_crtc *crtc, u32 base)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        uint32_t cntl;

        cntl = 0;
        if (base) {
                cntl = MCURSOR_GAMMA_ENABLE;
                switch (intel_crtc->cursor_width) {
                        case 64:
                                cntl |= CURSOR_MODE_64_ARGB_AX;
                                break;
                        case 128:
                                cntl |= CURSOR_MODE_128_ARGB_AX;
                                break;
                        case 256:
                                cntl |= CURSOR_MODE_256_ARGB_AX;
                                break;
                        default:
                                WARN_ON(1);
                                return;
                }
        }
        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                cntl |= CURSOR_PIPE_CSC_ENABLE;

        if (intel_crtc->cursor_cntl != cntl) {
                I915_WRITE(CURCNTR(pipe), cntl);
                POSTING_READ(CURCNTR(pipe));
                intel_crtc->cursor_cntl = cntl;
        }

        /* and commit changes on next vblank */
        I915_WRITE(CURBASE(pipe), base);
        POSTING_READ(CURBASE(pipe));
}

/* If no-part of the cursor is visible on the framebuffer, then the GPU may hang... */
static void intel_crtc_update_cursor(struct drm_crtc *crtc,
                                     bool on)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        int x = intel_crtc->cursor_x;
        int y = intel_crtc->cursor_y;
        u32 base = 0, pos = 0;

        if (on)
                base = intel_crtc->cursor_addr;

        if (x >= intel_crtc->config.pipe_src_w)
                base = 0;

        if (y >= intel_crtc->config.pipe_src_h)
                base = 0;

        if (x < 0) {
                if (x + intel_crtc->cursor_width <= 0)
                        base = 0;

                pos |= CURSOR_POS_SIGN << CURSOR_X_SHIFT;
                x = -x;
        }
        pos |= x << CURSOR_X_SHIFT;

        if (y < 0) {
                if (y + intel_crtc->cursor_height <= 0)
                        base = 0;

                pos |= CURSOR_POS_SIGN << CURSOR_Y_SHIFT;
                y = -y;
        }
        pos |= y << CURSOR_Y_SHIFT;

        if (base == 0 && intel_crtc->cursor_base == 0)
                return;

        I915_WRITE(CURPOS(pipe), pos);

        if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev) || IS_BROADWELL(dev))
                ivb_update_cursor(crtc, base);
        else if (IS_845G(dev) || IS_I865G(dev))
                i845_update_cursor(crtc, base);
        else
                i9xx_update_cursor(crtc, base);
        intel_crtc->cursor_base = base;
}

static int intel_crtc_cursor_set(struct drm_crtc *crtc,
                                 struct drm_file *file,
                                 uint32_t handle,
                                 uint32_t width, uint32_t height)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_i915_gem_object *obj;
        unsigned old_width;
        uint32_t addr;
        int ret;

        /* if we want to turn off the cursor ignore width and height */
        if (!handle) {
                DRM_DEBUG_KMS("cursor off\n");
                addr = 0;
                obj = NULL;
                mutex_lock(&dev->struct_mutex);
                goto finish;
        }

        /* Check for which cursor types we support */
        if (!((width == 64 && height == 64) ||
                        (width == 128 && height == 128 && !IS_GEN2(dev)) ||
                        (width == 256 && height == 256 && !IS_GEN2(dev)))) {
                DRM_DEBUG("Cursor dimension not supported\n");
                return -EINVAL;
        }

        obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
        if (&obj->base == NULL)
                return -ENOENT;

        if (obj->base.size < width * height * 4) {
                DRM_DEBUG_KMS("buffer is to small\n");
                ret = -ENOMEM;
                goto fail;
        }

        /* we only need to pin inside GTT if cursor is non-phy */
        mutex_lock(&dev->struct_mutex);
        if (!INTEL_INFO(dev)->cursor_needs_physical) {
                unsigned alignment;

                if (obj->tiling_mode) {
                        DRM_DEBUG_KMS("cursor cannot be tiled\n");
                        ret = -EINVAL;
                        goto fail_locked;
                }

                /* Note that the w/a also requires 2 PTE of padding following
                 * the bo. We currently fill all unused PTE with the shadow
                 * page and so we should always have valid PTE following the
                 * cursor preventing the VT-d warning.
                 */
                alignment = 0;
                if (need_vtd_wa(dev))
                        alignment = 64*1024;

                ret = i915_gem_object_pin_to_display_plane(obj, alignment, NULL);
                if (ret) {
                        DRM_DEBUG_KMS("failed to move cursor bo into the GTT\n");
                        goto fail_locked;
                }

                ret = i915_gem_object_put_fence(obj);
                if (ret) {
                        DRM_DEBUG_KMS("failed to release fence for cursor");
                        goto fail_unpin;
                }

                addr = i915_gem_obj_ggtt_offset(obj);
        } else {
                int align = IS_I830(dev) ? 16 * 1024 : 256;
                ret = i915_gem_object_attach_phys(obj, align);
                if (ret) {
                        DRM_DEBUG_KMS("failed to attach phys object\n");
                        goto fail_locked;
                }
                addr = obj->phys_handle->busaddr;
        }

        if (IS_GEN2(dev))
                I915_WRITE(CURSIZE, (height << 12) | width);

 finish:
        if (intel_crtc->cursor_bo) {
                if (!INTEL_INFO(dev)->cursor_needs_physical)
                        i915_gem_object_unpin_from_display_plane(intel_crtc->cursor_bo);
                drm_gem_object_unreference(&intel_crtc->cursor_bo->base);
        }

        mutex_unlock(&dev->struct_mutex);

        old_width = intel_crtc->cursor_width;

        intel_crtc->cursor_addr = addr;
        intel_crtc->cursor_bo = obj;
        intel_crtc->cursor_width = width;
        intel_crtc->cursor_height = height;

        if (intel_crtc->active) {
                if (old_width != width)
                        intel_update_watermarks(crtc);
                intel_crtc_update_cursor(crtc, intel_crtc->cursor_bo != NULL);
        }

        return 0;
fail_unpin:
        i915_gem_object_unpin_from_display_plane(obj);
fail_locked:
        mutex_unlock(&dev->struct_mutex);
fail:
        drm_gem_object_unreference_unlocked(&obj->base);
        return ret;
}

static int intel_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        intel_crtc->cursor_x = clamp_t(int, x, SHRT_MIN, SHRT_MAX);
        intel_crtc->cursor_y = clamp_t(int, y, SHRT_MIN, SHRT_MAX);

        if (intel_crtc->active)
                intel_crtc_update_cursor(crtc, intel_crtc->cursor_bo != NULL);

        return 0;
}

static void intel_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
                                 u16 *blue, uint32_t start, uint32_t size)
{
        int end = (start + size > 256) ? 256 : start + size, i;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        for (i = start; i < end; i++) {
                intel_crtc->lut_r[i] = red[i] >> 8;
                intel_crtc->lut_g[i] = green[i] >> 8;
                intel_crtc->lut_b[i] = blue[i] >> 8;
        }

        intel_crtc_load_lut(crtc);
}

/* VESA 640x480x72Hz mode to set on the pipe */
static struct drm_display_mode load_detect_mode = {
        DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664,
                 704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
};

struct drm_framebuffer *
__intel_framebuffer_create(struct drm_device *dev,
                           struct drm_mode_fb_cmd2 *mode_cmd,
                           struct drm_i915_gem_object *obj)
{
        struct intel_framebuffer *intel_fb;
        int ret;

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                drm_gem_object_unreference_unlocked(&obj->base);
                return ERR_PTR(-ENOMEM);
        }

        ret = intel_framebuffer_init(dev, intel_fb, mode_cmd, obj);
        if (ret)
                goto err;

        return &intel_fb->base;
err:
        drm_gem_object_unreference_unlocked(&obj->base);
        kfree(intel_fb);

        return ERR_PTR(ret);
}

static struct drm_framebuffer *
intel_framebuffer_create(struct drm_device *dev,
                         struct drm_mode_fb_cmd2 *mode_cmd,
                         struct drm_i915_gem_object *obj)
{
        struct drm_framebuffer *fb;
        int ret;

        ret = i915_mutex_lock_interruptible(dev);
        if (ret)
                return ERR_PTR(ret);
        fb = __intel_framebuffer_create(dev, mode_cmd, obj);
        mutex_unlock(&dev->struct_mutex);

        return fb;
}

static u32
intel_framebuffer_pitch_for_width(int width, int bpp)
{
        u32 pitch = DIV_ROUND_UP(width * bpp, 8);
        return ALIGN(pitch, 64);
}

static u32
intel_framebuffer_size_for_mode(struct drm_display_mode *mode, int bpp)
{
        u32 pitch = intel_framebuffer_pitch_for_width(mode->hdisplay, bpp);
        return ALIGN(pitch * mode->vdisplay, PAGE_SIZE);
}

static struct drm_framebuffer *
intel_framebuffer_create_for_mode(struct drm_device *dev,
                                  struct drm_display_mode *mode,
                                  int depth, int bpp)
{
        struct drm_i915_gem_object *obj;
        struct drm_mode_fb_cmd2 mode_cmd = { 0 };

        obj = i915_gem_alloc_object(dev,
                                    intel_framebuffer_size_for_mode(mode, bpp));
        if (obj == NULL)
                return ERR_PTR(-ENOMEM);

        mode_cmd.width = mode->hdisplay;
        mode_cmd.height = mode->vdisplay;
        mode_cmd.pitches[0] = intel_framebuffer_pitch_for_width(mode_cmd.width,
                                                                bpp);
        mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);

        return intel_framebuffer_create(dev, &mode_cmd, obj);
}

static struct drm_framebuffer *
mode_fits_in_fbdev(struct drm_device *dev,
                   struct drm_display_mode *mode)
{
#ifdef CONFIG_DRM_I915_FBDEV
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_i915_gem_object *obj;
        struct drm_framebuffer *fb;

        if (!dev_priv->fbdev)
                return NULL;

        if (!dev_priv->fbdev->fb)
                return NULL;

        obj = dev_priv->fbdev->fb->obj;
        BUG_ON(!obj);

        fb = &dev_priv->fbdev->fb->base;
        if (fb->pitches[0] < intel_framebuffer_pitch_for_width(mode->hdisplay,
                                                               fb->bits_per_pixel))
                return NULL;

        if (obj->base.size < mode->vdisplay * fb->pitches[0])
                return NULL;

        return fb;
#else
        return NULL;
#endif
}

bool intel_get_load_detect_pipe(struct drm_connector *connector,
                                struct drm_display_mode *mode,
                                struct intel_load_detect_pipe *old,
                                struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_crtc *intel_crtc;
        struct intel_encoder *intel_encoder =
                intel_attached_encoder(connector);
        struct drm_crtc *possible_crtc;
        struct drm_encoder *encoder = &intel_encoder->base;
        struct drm_crtc *crtc = NULL;
        struct drm_device *dev = encoder->dev;
        struct drm_framebuffer *fb;
        struct drm_mode_config *config = &dev->mode_config;
        int ret, i = -1;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                      connector->base.id, connector->name,
                      encoder->base.id, encoder->name);

        drm_modeset_acquire_init(ctx, 0);

retry:
        ret = drm_modeset_lock(&config->connection_mutex, ctx);
        if (ret)
                goto fail_unlock;

        /*
         * Algorithm gets a little messy:
         *
         *   - if the connector already has an assigned crtc, use it (but make
         *     sure it's on first)
         *
         *   - try to find the first unused crtc that can drive this connector,
         *     and use that if we find one
         */

        /* See if we already have a CRTC for this connector */
        if (encoder->crtc) {
                crtc = encoder->crtc;

                ret = drm_modeset_lock(&crtc->mutex, ctx);
                if (ret)
                        goto fail_unlock;

                old->dpms_mode = connector->dpms;
                old->load_detect_temp = false;

                /* Make sure the crtc and connector are running */
                if (connector->dpms != DRM_MODE_DPMS_ON)
                        connector->funcs->dpms(connector, DRM_MODE_DPMS_ON);

                return true;
        }

        /* Find an unused one (if possible) */
        for_each_crtc(dev, possible_crtc) {
                i++;
                if (!(encoder->possible_crtcs & (1 << i)))
                        continue;
                if (!possible_crtc->enabled) {
                        crtc = possible_crtc;
                        break;
                }
        }

        /*
         * If we didn't find an unused CRTC, don't use any.
         */
        if (!crtc) {
                DRM_DEBUG_KMS("no pipe available for load-detect\n");
                goto fail_unlock;
        }

        ret = drm_modeset_lock(&crtc->mutex, ctx);
        if (ret)
                goto fail_unlock;
        intel_encoder->new_crtc = to_intel_crtc(crtc);
        to_intel_connector(connector)->new_encoder = intel_encoder;

        intel_crtc = to_intel_crtc(crtc);
        intel_crtc->new_enabled = true;
        intel_crtc->new_config = &intel_crtc->config;
        old->dpms_mode = connector->dpms;
        old->load_detect_temp = true;
        old->release_fb = NULL;

        if (!mode)
                mode = &load_detect_mode;

        /* We need a framebuffer large enough to accommodate all accesses
         * that the plane may generate whilst we perform load detection.
         * We can not rely on the fbcon either being present (we get called
         * during its initialisation to detect all boot displays, or it may
         * not even exist) or that it is large enough to satisfy the
         * requested mode.
         */
        fb = mode_fits_in_fbdev(dev, mode);
        if (fb == NULL) {
                DRM_DEBUG_KMS("creating tmp fb for load-detection\n");
                fb = intel_framebuffer_create_for_mode(dev, mode, 24, 32);
                old->release_fb = fb;
        } else
                DRM_DEBUG_KMS("reusing fbdev for load-detection framebuffer\n");
        if (IS_ERR(fb)) {
                DRM_DEBUG_KMS("failed to allocate framebuffer for load-detection\n");
                goto fail;
        }

        if (intel_set_mode(crtc, mode, 0, 0, fb)) {
                DRM_DEBUG_KMS("failed to set mode on load-detect pipe\n");
                if (old->release_fb)
                        old->release_fb->funcs->destroy(old->release_fb);
                goto fail;
        }

        /* let the connector get through one full cycle before testing */
        intel_wait_for_vblank(dev, intel_crtc->pipe);
        return true;

 fail:
        intel_crtc->new_enabled = crtc->enabled;
        if (intel_crtc->new_enabled)
                intel_crtc->new_config = &intel_crtc->config;
        else
                intel_crtc->new_config = NULL;
fail_unlock:
        if (ret == -EDEADLK) {
                drm_modeset_backoff(ctx);
                goto retry;
        }

        drm_modeset_drop_locks(ctx);
        drm_modeset_acquire_fini(ctx);

        return false;
}

void intel_release_load_detect_pipe(struct drm_connector *connector,
                                    struct intel_load_detect_pipe *old,
                                    struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *intel_encoder =
                intel_attached_encoder(connector);
        struct drm_encoder *encoder = &intel_encoder->base;
        struct drm_crtc *crtc = encoder->crtc;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                      connector->base.id, connector->name,
                      encoder->base.id, encoder->name);

        if (old->load_detect_temp) {
                to_intel_connector(connector)->new_encoder = NULL;
                intel_encoder->new_crtc = NULL;
                intel_crtc->new_enabled = false;
                intel_crtc->new_config = NULL;
                intel_set_mode(crtc, NULL, 0, 0, NULL);

                if (old->release_fb) {
                        drm_framebuffer_unregister_private(old->release_fb);
                        drm_framebuffer_unreference(old->release_fb);
                }

                goto unlock;
                return;
        }

        /* Switch crtc and encoder back off if necessary */
        if (old->dpms_mode != DRM_MODE_DPMS_ON)
                connector->funcs->dpms(connector, old->dpms_mode);

unlock:
        drm_modeset_drop_locks(ctx);
        drm_modeset_acquire_fini(ctx);
}

static int i9xx_pll_refclk(struct drm_device *dev,
                           const struct intel_crtc_config *pipe_config)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 dpll = pipe_config->dpll_hw_state.dpll;

        if ((dpll & PLL_REF_INPUT_MASK) == PLLB_REF_INPUT_SPREADSPECTRUMIN)
                return dev_priv->vbt.lvds_ssc_freq;
        else if (HAS_PCH_SPLIT(dev))
                return 120000;
        else if (!IS_GEN2(dev))
                return 96000;
        else
                return 48000;
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe = pipe_config->cpu_transcoder;
        u32 dpll = pipe_config->dpll_hw_state.dpll;
        u32 fp;
        intel_clock_t clock;
        int refclk = i9xx_pll_refclk(dev, pipe_config);

        if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
                fp = pipe_config->dpll_hw_state.fp0;
        else
                fp = pipe_config->dpll_hw_state.fp1;

        clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
        if (IS_PINEVIEW(dev)) {
                clock.n = ffs((fp & FP_N_PINEVIEW_DIV_MASK) >> FP_N_DIV_SHIFT) - 1;
                clock.m2 = (fp & FP_M2_PINEVIEW_DIV_MASK) >> FP_M2_DIV_SHIFT;
        } else {
                clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;
                clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
        }

        if (!IS_GEN2(dev)) {
                if (IS_PINEVIEW(dev))
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_PINEVIEW) >>
                                DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW);
                else
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK) >>
                               DPLL_FPA01_P1_POST_DIV_SHIFT);

                switch (dpll & DPLL_MODE_MASK) {
                case DPLLB_MODE_DAC_SERIAL:
                        clock.p2 = dpll & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5 ?
                                5 : 10;
                        break;
                case DPLLB_MODE_LVDS:
                        clock.p2 = dpll & DPLLB_LVDS_P2_CLOCK_DIV_7 ?
                                7 : 14;
                        break;
                default:
                        DRM_DEBUG_KMS("Unknown DPLL mode %08x in programmed "
                                  "mode\n", (int)(dpll & DPLL_MODE_MASK));
                        return;
                }

                if (IS_PINEVIEW(dev))
                        pineview_clock(refclk, &clock);
                else
                        i9xx_clock(refclk, &clock);
        } else {
                u32 lvds = IS_I830(dev) ? 0 : I915_READ(LVDS);
                bool is_lvds = (pipe == 1) && (lvds & LVDS_PORT_EN);

                if (is_lvds) {
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
                                       DPLL_FPA01_P1_POST_DIV_SHIFT);

                        if (lvds & LVDS_CLKB_POWER_UP)
                                clock.p2 = 7;
                        else
                                clock.p2 = 14;
                } else {
                        if (dpll & PLL_P1_DIVIDE_BY_TWO)
                                clock.p1 = 2;
                        else {
                                clock.p1 = ((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
                                            DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
                        }
                        if (dpll & PLL_P2_DIVIDE_BY_4)
                                clock.p2 = 4;
                        else
                                clock.p2 = 2;
                }

                i9xx_clock(refclk, &clock);
        }

        /*
         * This value includes pixel_multiplier. We will use
         * port_clock to compute adjusted_mode.crtc_clock in the
         * encoder's get_config() function.
         */
        pipe_config->port_clock = clock.dot;
}

int intel_dotclock_calculate(int link_freq,
                             const struct intel_link_m_n *m_n)
{
        /*
         * The calculation for the data clock is:
         * pixel_clock = ((m/n)*(link_clock * nr_lanes))/bpp
         * But we want to avoid losing precison if possible, so:
         * pixel_clock = ((m * link_clock * nr_lanes)/(n*bpp))
         *
         * and the link clock is simpler:
         * link_clock = (m * link_clock) / n
         */

        if (!m_n->link_n)
                return 0;

        return div_u64((u64)m_n->link_m * link_freq, m_n->link_n);
}

static void ironlake_pch_clock_get(struct intel_crtc *crtc,
                                   struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;

        /* read out port_clock from the DPLL */
        i9xx_crtc_clock_get(crtc, pipe_config);

        /*
         * This value does not include pixel_multiplier.
         * We will check that port_clock and adjusted_mode.crtc_clock
         * agree once we know their relationship in the encoder's
         * get_config() function.
         */
        pipe_config->adjusted_mode.crtc_clock =
                intel_dotclock_calculate(intel_fdi_link_freq(dev) * 10000,
                                         &pipe_config->fdi_m_n);
}

/** Returns the currently programmed mode of the given pipe. */
struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
                                             struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
        struct drm_display_mode *mode;
        struct intel_crtc_config pipe_config;
        int htot = I915_READ(HTOTAL(cpu_transcoder));
        int hsync = I915_READ(HSYNC(cpu_transcoder));
        int vtot = I915_READ(VTOTAL(cpu_transcoder));
        int vsync = I915_READ(VSYNC(cpu_transcoder));
        enum pipe pipe = intel_crtc->pipe;

        mode = kzalloc(sizeof(*mode), GFP_KERNEL);
        if (!mode)
                return NULL;

        /*
         * Construct a pipe_config sufficient for getting the clock info
         * back out of crtc_clock_get.
         *
         * Note, if LVDS ever uses a non-1 pixel multiplier, we'll need
         * to use a real value here instead.
         */
        pipe_config.cpu_transcoder = (enum transcoder) pipe;
        pipe_config.pixel_multiplier = 1;
        pipe_config.dpll_hw_state.dpll = I915_READ(DPLL(pipe));
        pipe_config.dpll_hw_state.fp0 = I915_READ(FP0(pipe));
        pipe_config.dpll_hw_state.fp1 = I915_READ(FP1(pipe));
        i9xx_crtc_clock_get(intel_crtc, &pipe_config);

        mode->clock = pipe_config.port_clock / pipe_config.pixel_multiplier;
        mode->hdisplay = (htot & 0xffff) + 1;
        mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
        mode->hsync_start = (hsync & 0xffff) + 1;
        mode->hsync_end = ((hsync & 0xffff0000) >> 16) + 1;
        mode->vdisplay = (vtot & 0xffff) + 1;
        mode->vtotal = ((vtot & 0xffff0000) >> 16) + 1;
        mode->vsync_start = (vsync & 0xffff) + 1;
        mode->vsync_end = ((vsync & 0xffff0000) >> 16) + 1;

        drm_mode_set_name(mode);

        return mode;
}

static void intel_increase_pllclock(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        int dpll_reg = DPLL(pipe);
        int dpll;

        if (HAS_PCH_SPLIT(dev))
                return;

        if (!dev_priv->lvds_downclock_avail)
                return;

        dpll = I915_READ(dpll_reg);
        if (!HAS_PIPE_CXSR(dev) && (dpll & DISPLAY_RATE_SELECT_FPA1)) {
                DRM_DEBUG_DRIVER("upclocking LVDS\n");

                assert_panel_unlocked(dev_priv, pipe);

                dpll &= ~DISPLAY_RATE_SELECT_FPA1;
                I915_WRITE(dpll_reg, dpll);
                intel_wait_for_vblank(dev, pipe);

                dpll = I915_READ(dpll_reg);
                if (dpll & DISPLAY_RATE_SELECT_FPA1)
                        DRM_DEBUG_DRIVER("failed to upclock LVDS!\n");
        }
}

static void intel_decrease_pllclock(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        if (HAS_PCH_SPLIT(dev))
                return;

        if (!dev_priv->lvds_downclock_avail)
                return;

        /*
         * Since this is called by a timer, we should never get here in
         * the manual case.
         */
        if (!HAS_PIPE_CXSR(dev) && intel_crtc->lowfreq_avail) {
                int pipe = intel_crtc->pipe;
                int dpll_reg = DPLL(pipe);
                int dpll;

                DRM_DEBUG_DRIVER("downclocking LVDS\n");

                assert_panel_unlocked(dev_priv, pipe);

                dpll = I915_READ(dpll_reg);
                dpll |= DISPLAY_RATE_SELECT_FPA1;
                I915_WRITE(dpll_reg, dpll);
                intel_wait_for_vblank(dev, pipe);
                dpll = I915_READ(dpll_reg);
                if (!(dpll & DISPLAY_RATE_SELECT_FPA1))
                        DRM_DEBUG_DRIVER("failed to downclock LVDS!\n");
        }

}

void intel_mark_busy(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (dev_priv->mm.busy)
                return;

        intel_runtime_pm_get(dev_priv);
        i915_update_gfx_val(dev_priv);
        dev_priv->mm.busy = true;
}

void intel_mark_idle(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_crtc *crtc;

        if (!dev_priv->mm.busy)
                return;

        dev_priv->mm.busy = false;

        if (!i915.powersave)
                goto out;

        for_each_crtc(dev, crtc) {
                if (!crtc->primary->fb)
                        continue;

                intel_decrease_pllclock(crtc);
        }

        if (INTEL_INFO(dev)->gen >= 6)
                gen6_rps_idle(dev->dev_private);

out:
        intel_runtime_pm_put(dev_priv);
}

void intel_mark_fb_busy(struct drm_i915_gem_object *obj,
                        struct intel_engine_cs *ring)
{
        struct drm_device *dev = obj->base.dev;
        struct drm_crtc *crtc;

        if (!i915.powersave)
                return;

        for_each_crtc(dev, crtc) {
                if (!crtc->primary->fb)
                        continue;

                if (to_intel_framebuffer(crtc->primary->fb)->obj != obj)
                        continue;

                intel_increase_pllclock(crtc);
                if (ring && intel_fbc_enabled(dev))
                        ring->fbc_dirty = true;
        }
}

static void intel_crtc_destroy(struct drm_crtc *crtc)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        struct intel_unpin_work *work;
        unsigned long flags;

        spin_lock_irqsave(&dev->event_lock, flags);
        work = intel_crtc->unpin_work;
        intel_crtc->unpin_work = NULL;
        spin_unlock_irqrestore(&dev->event_lock, flags);

        if (work) {
                cancel_work_sync(&work->work);
                kfree(work);
        }

        intel_crtc_cursor_set(crtc, NULL, 0, 0, 0);

        drm_crtc_cleanup(crtc);

        kfree(intel_crtc);
}

static void intel_unpin_work_fn(struct work_struct *__work)
{
        struct intel_unpin_work *work =
                container_of(__work, struct intel_unpin_work, work);
        struct drm_device *dev = work->crtc->dev;

        mutex_lock(&dev->struct_mutex);
        intel_unpin_fb_obj(work->old_fb_obj);
        drm_gem_object_unreference(&work->pending_flip_obj->base);
        drm_gem_object_unreference(&work->old_fb_obj->base);

        intel_update_fbc(dev);
        mutex_unlock(&dev->struct_mutex);

        BUG_ON(atomic_read(&to_intel_crtc(work->crtc)->unpin_work_count) == 0);
        atomic_dec(&to_intel_crtc(work->crtc)->unpin_work_count);

        kfree(work);
}

static void do_intel_finish_page_flip(struct drm_device *dev,
                                      struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_unpin_work *work;
        unsigned long flags;

        /* Ignore early vblank irqs */
        if (intel_crtc == NULL)
                return;

        spin_lock_irqsave(&dev->event_lock, flags);
        work = intel_crtc->unpin_work;

        /* Ensure we don't miss a work->pending update ... */
        smp_rmb();

        if (work == NULL || atomic_read(&work->pending) < INTEL_FLIP_COMPLETE) {
                spin_unlock_irqrestore(&dev->event_lock, flags);
                return;
        }

        /* and that the unpin work is consistent wrt ->pending. */
        smp_rmb();

        intel_crtc->unpin_work = NULL;

        if (work->event)
                drm_send_vblank_event(dev, intel_crtc->pipe, work->event);

        drm_crtc_vblank_put(crtc);

        spin_unlock_irqrestore(&dev->event_lock, flags);

        wake_up_all(&dev_priv->pending_flip_queue);

        queue_work(dev_priv->wq, &work->work);

        trace_i915_flip_complete(intel_crtc->plane, work->pending_flip_obj);
}

void intel_finish_page_flip(struct drm_device *dev, int pipe)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];

        do_intel_finish_page_flip(dev, crtc);
}

void intel_finish_page_flip_plane(struct drm_device *dev, int plane)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_crtc *crtc = dev_priv->plane_to_crtc_mapping[plane];

        do_intel_finish_page_flip(dev, crtc);
}

/* Is 'a' after or equal to 'b'? */
static bool g4x_flip_count_after_eq(u32 a, u32 b)
{
        return !((a - b) & 0x80000000);
}

static bool page_flip_finished(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;

        /*
         * The relevant registers doen't exist on pre-ctg.
         * As the flip done interrupt doesn't trigger for mmio
         * flips on gmch platforms, a flip count check isn't
         * really needed there. But since ctg has the registers,
         * include it in the check anyway.
         */
        if (INTEL_INFO(dev)->gen < 5 && !IS_G4X(dev))
                return true;

        /*
         * A DSPSURFLIVE check isn't enough in case the mmio and CS flips
         * used the same base address. In that case the mmio flip might
         * have completed, but the CS hasn't even executed the flip yet.
         *
         * A flip count check isn't enough as the CS might have updated
         * the base address just after start of vblank, but before we
         * managed to process the interrupt. This means we'd complete the
         * CS flip too soon.
         *
         * Combining both checks should get us a good enough result. It may
         * still happen that the CS flip has been executed, but has not
         * yet actually completed. But in case the base address is the same
         * anyway, we don't really care.
         */
        return (I915_READ(DSPSURFLIVE(crtc->plane)) & ~0xfff) ==
                crtc->unpin_work->gtt_offset &&
                g4x_flip_count_after_eq(I915_READ(PIPE_FLIPCOUNT_GM45(crtc->pipe)),
                                    crtc->unpin_work->flip_count);
}

void intel_prepare_page_flip(struct drm_device *dev, int plane)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc =
                to_intel_crtc(dev_priv->plane_to_crtc_mapping[plane]);
        unsigned long flags;

        /* NB: An MMIO update of the plane base pointer will also
         * generate a page-flip completion irq, i.e. every modeset
         * is also accompanied by a spurious intel_prepare_page_flip().
         */
        spin_lock_irqsave(&dev->event_lock, flags);
        if (intel_crtc->unpin_work && page_flip_finished(intel_crtc))
                atomic_inc_not_zero(&intel_crtc->unpin_work->pending);
        spin_unlock_irqrestore(&dev->event_lock, flags);
}

static inline void intel_mark_page_flip_active(struct intel_crtc *intel_crtc)
{
        /* Ensure that the work item is consistent when activating it ... */
        smp_wmb();
        atomic_set(&intel_crtc->unpin_work->pending, INTEL_FLIP_PENDING);
        /* and that it is marked active as soon as the irq could fire. */
        smp_wmb();
}

static int intel_gen2_queue_flip(struct drm_device *dev,
                                 struct drm_crtc *crtc,
                                 struct drm_framebuffer *fb,
                                 struct drm_i915_gem_object *obj,
                                 struct intel_engine_cs *ring,
                                 uint32_t flags)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        u32 flip_mask;
        int ret;

        ret = intel_ring_begin(ring, 6);
        if (ret)
                return ret;

        /* Can't queue multiple flips, so wait for the previous
         * one to finish before executing the next.
         */
        if (intel_crtc->plane)
                flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
        else
                flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
        intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
        intel_ring_emit(ring, MI_NOOP);
        intel_ring_emit(ring, MI_DISPLAY_FLIP |
                        MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
        intel_ring_emit(ring, fb->pitches[0]);
        intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
        intel_ring_emit(ring, 0); /* aux display base address, unused */

        intel_mark_page_flip_active(intel_crtc);
        __intel_ring_advance(ring);
        return 0;
}

static int intel_gen3_queue_flip(struct drm_device *dev,
                                 struct drm_crtc *crtc,
                                 struct drm_framebuffer *fb,
                                 struct drm_i915_gem_object *obj,
                                 struct intel_engine_cs *ring,
                                 uint32_t flags)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        u32 flip_mask;
        int ret;

        ret = intel_ring_begin(ring, 6);
        if (ret)
                return ret;

        if (intel_crtc->plane)
                flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
        else
                flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
        intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
        intel_ring_emit(ring, MI_NOOP);
        intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 |
                        MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
        intel_ring_emit(ring, fb->pitches[0]);
        intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
        intel_ring_emit(ring, MI_NOOP);

        intel_mark_page_flip_active(intel_crtc);
        __intel_ring_advance(ring);
        return 0;
}

static int intel_gen4_queue_flip(struct drm_device *dev,
                                 struct drm_crtc *crtc,
                                 struct drm_framebuffer *fb,
                                 struct drm_i915_gem_object *obj,
                                 struct intel_engine_cs *ring,
                                 uint32_t flags)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        uint32_t pf, pipesrc;
        int ret;

        ret = intel_ring_begin(ring, 4);
        if (ret)
                return ret;

        /* i965+ uses the linear or tiled offsets from the
         * Display Registers (which do not change across a page-flip)
         * so we need only reprogram the base address.
         */
        intel_ring_emit(ring, MI_DISPLAY_FLIP |
                        MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
        intel_ring_emit(ring, fb->pitches[0]);
        intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset |
                        obj->tiling_mode);

        /* XXX Enabling the panel-fitter across page-flip is so far
         * untested on non-native modes, so ignore it for now.
         * pf = I915_READ(pipe == 0 ? PFA_CTL_1 : PFB_CTL_1) & PF_ENABLE;
         */
        pf = 0;
        pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
        intel_ring_emit(ring, pf | pipesrc);

        intel_mark_page_flip_active(intel_crtc);
        __intel_ring_advance(ring);
        return 0;
}

static int intel_gen6_queue_flip(struct drm_device *dev,
                                 struct drm_crtc *crtc,
                                 struct drm_framebuffer *fb,
                                 struct drm_i915_gem_object *obj,
                                 struct intel_engine_cs *ring,
                                 uint32_t flags)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        uint32_t pf, pipesrc;
        int ret;

        ret = intel_ring_begin(ring, 4);
        if (ret)
                return ret;

        intel_ring_emit(ring, MI_DISPLAY_FLIP |
                        MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
        intel_ring_emit(ring, fb->pitches[0] | obj->tiling_mode);
        intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);

        /* Contrary to the suggestions in the documentation,
         * "Enable Panel Fitter" does not seem to be required when page
         * flipping with a non-native mode, and worse causes a normal
         * modeset to fail.
         * pf = I915_READ(PF_CTL(intel_crtc->pipe)) & PF_ENABLE;
         */
        pf = 0;
        pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
        intel_ring_emit(ring, pf | pipesrc);

        intel_mark_page_flip_active(intel_crtc);
        __intel_ring_advance(ring);
        return 0;
}

static int intel_gen7_queue_flip(struct drm_device *dev,
                                 struct drm_crtc *crtc,
                                 struct drm_framebuffer *fb,
                                 struct drm_i915_gem_object *obj,
                                 struct intel_engine_cs *ring,
                                 uint32_t flags)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        uint32_t plane_bit = 0;
        int len, ret;

        switch (intel_crtc->plane) {
        case PLANE_A:
                plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_A;
                break;
        case PLANE_B:
                plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_B;
                break;
        case PLANE_C:
                plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_C;
                break;
        default:
                WARN_ONCE(1, "unknown plane in flip command\n");
                return -ENODEV;
        }

        len = 4;
        if (ring->id == RCS) {
                len += 6;
                /*
                 * On Gen 8, SRM is now taking an extra dword to accommodate
                 * 48bits addresses, and we need a NOOP for the batch size to
                 * stay even.
                 */
                if (IS_GEN8(dev))
                        len += 2;
        }

        /*
         * BSpec MI_DISPLAY_FLIP for IVB:
         * "The full packet must be contained within the same cache line."
         *
         * Currently the LRI+SRM+MI_DISPLAY_FLIP all fit within the same
         * cacheline, if we ever start emitting more commands before
         * the MI_DISPLAY_FLIP we may need to first emit everything else,
         * then do the cacheline alignment, and finally emit the
         * MI_DISPLAY_FLIP.
         */
        ret = intel_ring_cacheline_align(ring);
        if (ret)
                return ret;

        ret = intel_ring_begin(ring, len);
        if (ret)
                return ret;

        /* Unmask the flip-done completion message. Note that the bspec says that
         * we should do this for both the BCS and RCS, and that we must not unmask
         * more than one flip event at any time (or ensure that one flip message
         * can be sent by waiting for flip-done prior to queueing new flips).
         * Experimentation says that BCS works despite DERRMR masking all
         * flip-done completion events and that unmasking all planes at once
         * for the RCS also doesn't appear to drop events. Setting the DERRMR
         * to zero does lead to lockups within MI_DISPLAY_FLIP.
         */
        if (ring->id == RCS) {
                intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
                intel_ring_emit(ring, DERRMR);
                intel_ring_emit(ring, ~(DERRMR_PIPEA_PRI_FLIP_DONE |
                                        DERRMR_PIPEB_PRI_FLIP_DONE |
                                        DERRMR_PIPEC_PRI_FLIP_DONE));
                if (IS_GEN8(dev))
                        intel_ring_emit(ring, MI_STORE_REGISTER_MEM_GEN8(1) |
                                              MI_SRM_LRM_GLOBAL_GTT);
                else
                        intel_ring_emit(ring, MI_STORE_REGISTER_MEM(1) |
                                              MI_SRM_LRM_GLOBAL_GTT);
                intel_ring_emit(ring, DERRMR);
                intel_ring_emit(ring, ring->scratch.gtt_offset + 256);
                if (IS_GEN8(dev)) {
                        intel_ring_emit(ring, 0);
                        intel_ring_emit(ring, MI_NOOP);
                }
        }

        intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 | plane_bit);
        intel_ring_emit(ring, (fb->pitches[0] | obj->tiling_mode));
        intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
        intel_ring_emit(ring, (MI_NOOP));

        intel_mark_page_flip_active(intel_crtc);
        __intel_ring_advance(ring);
        return 0;
}

static int intel_default_queue_flip(struct drm_device *dev,
                                    struct drm_crtc *crtc,
                                    struct drm_framebuffer *fb,
                                    struct drm_i915_gem_object *obj,
                                    struct intel_engine_cs *ring,
                                    uint32_t flags)
{
        return -ENODEV;
}

static int intel_crtc_page_flip(struct drm_crtc *crtc,
                                struct drm_framebuffer *fb,
                                struct drm_pending_vblank_event *event,
                                uint32_t page_flip_flags)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_framebuffer *old_fb = crtc->primary->fb;
        struct drm_i915_gem_object *obj = to_intel_framebuffer(fb)->obj;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_unpin_work *work;
        struct intel_engine_cs *ring;
        unsigned long flags;
        int ret;

        /* Can't change pixel format via MI display flips. */
        if (fb->pixel_format != crtc->primary->fb->pixel_format)
                return -EINVAL;

        /*
         * TILEOFF/LINOFF registers can't be changed via MI display flips.
         * Note that pitch changes could also affect these register.
         */
        if (INTEL_INFO(dev)->gen > 3 &&
            (fb->offsets[0] != crtc->primary->fb->offsets[0] ||
             fb->pitches[0] != crtc->primary->fb->pitches[0]))
                return -EINVAL;

        if (i915_terminally_wedged(&dev_priv->gpu_error))
                goto out_hang;

        work = kzalloc(sizeof(*work), GFP_KERNEL);
        if (work == NULL)
                return -ENOMEM;

        work->event = event;
        work->crtc = crtc;
        work->old_fb_obj = to_intel_framebuffer(old_fb)->obj;
        INIT_WORK(&work->work, intel_unpin_work_fn);

        ret = drm_crtc_vblank_get(crtc);
        if (ret)
                goto free_work;

        /* We borrow the event spin lock for protecting unpin_work */
        spin_lock_irqsave(&dev->event_lock, flags);
        if (intel_crtc->unpin_work) {
                spin_unlock_irqrestore(&dev->event_lock, flags);
                kfree(work);
                drm_crtc_vblank_put(crtc);

                DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
                return -EBUSY;
        }
        intel_crtc->unpin_work = work;
        spin_unlock_irqrestore(&dev->event_lock, flags);

        if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
                flush_workqueue(dev_priv->wq);

        ret = i915_mutex_lock_interruptible(dev);
        if (ret)
                goto cleanup;

        /* Reference the objects for the scheduled work. */
        drm_gem_object_reference(&work->old_fb_obj->base);
        drm_gem_object_reference(&obj->base);

        crtc->primary->fb = fb;

        work->pending_flip_obj = obj;

        work->enable_stall_check = true;

        atomic_inc(&intel_crtc->unpin_work_count);
        intel_crtc->reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);

        if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev))
                work->flip_count = I915_READ(PIPE_FLIPCOUNT_GM45(intel_crtc->pipe)) + 1;

        if (IS_VALLEYVIEW(dev)) {
                ring = &dev_priv->ring[BCS];
        } else if (INTEL_INFO(dev)->gen >= 7) {
                ring = obj->ring;
                if (ring == NULL || ring->id != RCS)
                        ring = &dev_priv->ring[BCS];
        } else {
                ring = &dev_priv->ring[RCS];
        }

        ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
        if (ret)
                goto cleanup_pending;

        work->gtt_offset =
                i915_gem_obj_ggtt_offset(obj) + intel_crtc->dspaddr_offset;

        ret = dev_priv->display.queue_flip(dev, crtc, fb, obj, ring, page_flip_flags);
        if (ret)
                goto cleanup_unpin;

        intel_disable_fbc(dev);
        intel_mark_fb_busy(obj, NULL);
        mutex_unlock(&dev->struct_mutex);

        trace_i915_flip_request(intel_crtc->plane, obj);

        return 0;

cleanup_unpin:
        intel_unpin_fb_obj(obj);
cleanup_pending:
        atomic_dec(&intel_crtc->unpin_work_count);
        crtc->primary->fb = old_fb;
        drm_gem_object_unreference(&work->old_fb_obj->base);
        drm_gem_object_unreference(&obj->base);
        mutex_unlock(&dev->struct_mutex);

cleanup:
        spin_lock_irqsave(&dev->event_lock, flags);
        intel_crtc->unpin_work = NULL;
        spin_unlock_irqrestore(&dev->event_lock, flags);

        drm_crtc_vblank_put(crtc);
free_work:
        kfree(work);

        if (ret == -EIO) {
out_hang:
                intel_crtc_wait_for_pending_flips(crtc);
                ret = intel_pipe_set_base(crtc, crtc->x, crtc->y, fb);
                if (ret == 0 && event)
                        drm_send_vblank_event(dev, intel_crtc->pipe, event);
        }
        return ret;
}

static struct drm_crtc_helper_funcs intel_helper_funcs = {
        .mode_set_base_atomic = intel_pipe_set_base_atomic,
        .load_lut = intel_crtc_load_lut,
};

/**
 * intel_modeset_update_staged_output_state
 *
 * Updates the staged output configuration state, e.g. after we've read out the
 * current hw state.
 */
static void intel_modeset_update_staged_output_state(struct drm_device *dev)
{
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_connector *connector;

        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                connector->new_encoder =
                        to_intel_encoder(connector->base.encoder);
        }

        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {
                encoder->new_crtc =
                        to_intel_crtc(encoder->base.crtc);
        }

        for_each_intel_crtc(dev, crtc) {
                crtc->new_enabled = crtc->base.enabled;

                if (crtc->new_enabled)
                        crtc->new_config = &crtc->config;
                else
                        crtc->new_config = NULL;
        }
}

/**
 * intel_modeset_commit_output_state
 *
 * This function copies the stage display pipe configuration to the real one.
 */
static void intel_modeset_commit_output_state(struct drm_device *dev)
{
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_connector *connector;

        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                connector->base.encoder = &connector->new_encoder->base;
        }

        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {
                encoder->base.crtc = &encoder->new_crtc->base;
        }

        for_each_intel_crtc(dev, crtc) {
                crtc->base.enabled = crtc->new_enabled;
        }
}

static void
connected_sink_compute_bpp(struct intel_connector *connector,
                           struct intel_crtc_config *pipe_config)
{
        int bpp = pipe_config->pipe_bpp;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] checking for sink bpp constrains\n",
                connector->base.base.id,
                connector->base.name);

        /* Don't use an invalid EDID bpc value */
        if (connector->base.display_info.bpc &&
            connector->base.display_info.bpc * 3 < bpp) {
                DRM_DEBUG_KMS("clamping display bpp (was %d) to EDID reported max of %d\n",
                              bpp, connector->base.display_info.bpc*3);
                pipe_config->pipe_bpp = connector->base.display_info.bpc*3;
        }

        /* Clamp bpp to 8 on screens without EDID 1.4 */
        if (connector->base.display_info.bpc == 0 && bpp > 24) {
                DRM_DEBUG_KMS("clamping display bpp (was %d) to default limit of 24\n",
                              bpp);
                pipe_config->pipe_bpp = 24;
        }
}

static int
compute_baseline_pipe_bpp(struct intel_crtc *crtc,
                          struct drm_framebuffer *fb,
                          struct intel_crtc_config *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_connector *connector;
        int bpp;

        switch (fb->pixel_format) {
        case DRM_FORMAT_C8:
                bpp = 8*3; /* since we go through a colormap */
                break;
        case DRM_FORMAT_XRGB1555:
        case DRM_FORMAT_ARGB1555:
                /* checked in intel_framebuffer_init already */
                if (WARN_ON(INTEL_INFO(dev)->gen > 3))
                        return -EINVAL;
        case DRM_FORMAT_RGB565:
                bpp = 6*3; /* min is 18bpp */
                break;
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ABGR8888:
                /* checked in intel_framebuffer_init already */
                if (WARN_ON(INTEL_INFO(dev)->gen < 4))
                        return -EINVAL;
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                bpp = 8*3;
                break;
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_ARGB2101010:
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_ABGR2101010:
                /* checked in intel_framebuffer_init already */
                if (WARN_ON(INTEL_INFO(dev)->gen < 4))
                        return -EINVAL;
                bpp = 10*3;
                break;
        /* TODO: gen4+ supports 16 bpc floating point, too. */
        default:
                DRM_DEBUG_KMS("unsupported depth\n");
                return -EINVAL;
        }

        pipe_config->pipe_bpp = bpp;

        /* Clamp display bpp to EDID value */
        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                if (!connector->new_encoder ||
                    connector->new_encoder->new_crtc != crtc)
                        continue;

                connected_sink_compute_bpp(connector, pipe_config);
        }

        return bpp;
}

static void intel_dump_crtc_timings(const struct drm_display_mode *mode)
{
        DRM_DEBUG_KMS("crtc timings: %d %d %d %d %d %d %d %d %d, "
                        "type: 0x%x flags: 0x%x\n",
                mode->crtc_clock,
                mode->crtc_hdisplay, mode->crtc_hsync_start,
                mode->crtc_hsync_end, mode->crtc_htotal,
                mode->crtc_vdisplay, mode->crtc_vsync_start,
                mode->crtc_vsync_end, mode->crtc_vtotal, mode->type, mode->flags);
}

static void intel_dump_pipe_config(struct intel_crtc *crtc,
                                   struct intel_crtc_config *pipe_config,
                                   const char *context)
{
        DRM_DEBUG_KMS("[CRTC:%d]%s config for pipe %c\n", crtc->base.base.id,
                      context, pipe_name(crtc->pipe));

        DRM_DEBUG_KMS("cpu_transcoder: %c\n", transcoder_name(pipe_config->cpu_transcoder));
        DRM_DEBUG_KMS("pipe bpp: %i, dithering: %i\n",
                      pipe_config->pipe_bpp, pipe_config->dither);
        DRM_DEBUG_KMS("fdi/pch: %i, lanes: %i, gmch_m: %u, gmch_n: %u, link_m: %u, link_n: %u, tu: %u\n",
                      pipe_config->has_pch_encoder,
                      pipe_config->fdi_lanes,
                      pipe_config->fdi_m_n.gmch_m, pipe_config->fdi_m_n.gmch_n,
                      pipe_config->fdi_m_n.link_m, pipe_config->fdi_m_n.link_n,
                      pipe_config->fdi_m_n.tu);
        DRM_DEBUG_KMS("dp: %i, gmch_m: %u, gmch_n: %u, link_m: %u, link_n: %u, tu: %u\n",
                      pipe_config->has_dp_encoder,
                      pipe_config->dp_m_n.gmch_m, pipe_config->dp_m_n.gmch_n,
                      pipe_config->dp_m_n.link_m, pipe_config->dp_m_n.link_n,
                      pipe_config->dp_m_n.tu);
        DRM_DEBUG_KMS("requested mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->requested_mode);
        DRM_DEBUG_KMS("adjusted mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->adjusted_mode);
        intel_dump_crtc_timings(&pipe_config->adjusted_mode);
        DRM_DEBUG_KMS("port clock: %d\n", pipe_config->port_clock);
        DRM_DEBUG_KMS("pipe src size: %dx%d\n",
                      pipe_config->pipe_src_w, pipe_config->pipe_src_h);
        DRM_DEBUG_KMS("gmch pfit: control: 0x%08x, ratios: 0x%08x, lvds border: 0x%08x\n",
                      pipe_config->gmch_pfit.control,
                      pipe_config->gmch_pfit.pgm_ratios,
                      pipe_config->gmch_pfit.lvds_border_bits);
        DRM_DEBUG_KMS("pch pfit: pos: 0x%08x, size: 0x%08x, %s\n",
                      pipe_config->pch_pfit.pos,
                      pipe_config->pch_pfit.size,
                      pipe_config->pch_pfit.enabled ? "enabled" : "disabled");
        DRM_DEBUG_KMS("ips: %i\n", pipe_config->ips_enabled);
        DRM_DEBUG_KMS("double wide: %i\n", pipe_config->double_wide);
}

static bool encoders_cloneable(const struct intel_encoder *a,
                               const struct intel_encoder *b)
{
        /* masks could be asymmetric, so check both ways */
        return a == b || (a->cloneable & (1 << b->type) &&
                          b->cloneable & (1 << a->type));
}

static bool check_single_encoder_cloning(struct intel_crtc *crtc,
                                         struct intel_encoder *encoder)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_encoder *source_encoder;

        list_for_each_entry(source_encoder,
                            &dev->mode_config.encoder_list, base.head) {
                if (source_encoder->new_crtc != crtc)
                        continue;

                if (!encoders_cloneable(encoder, source_encoder))
                        return false;
        }

        return true;
}

static bool check_encoder_cloning(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_encoder *encoder;

        list_for_each_entry(encoder,
                            &dev->mode_config.encoder_list, base.head) {
                if (encoder->new_crtc != crtc)
                        continue;

                if (!check_single_encoder_cloning(crtc, encoder))
                        return false;
        }

        return true;
}

static struct intel_crtc_config *
intel_modeset_pipe_config(struct drm_crtc *crtc,
                          struct drm_framebuffer *fb,
                          struct drm_display_mode *mode)
{
        struct drm_device *dev = crtc->dev;
        struct intel_encoder *encoder;
        struct intel_crtc_config *pipe_config;
        int plane_bpp, ret = -EINVAL;
        bool retry = true;

        if (!check_encoder_cloning(to_intel_crtc(crtc))) {
                DRM_DEBUG_KMS("rejecting invalid cloning configuration\n");
                return ERR_PTR(-EINVAL);
        }

        pipe_config = kzalloc(sizeof(*pipe_config), GFP_KERNEL);
        if (!pipe_config)
                return ERR_PTR(-ENOMEM);

        drm_mode_copy(&pipe_config->adjusted_mode, mode);
        drm_mode_copy(&pipe_config->requested_mode, mode);

        pipe_config->cpu_transcoder =
                (enum transcoder) to_intel_crtc(crtc)->pipe;
        pipe_config->shared_dpll = DPLL_ID_PRIVATE;

        /*
         * Sanitize sync polarity flags based on requested ones. If neither
         * positive or negative polarity is requested, treat this as meaning
         * negative polarity.
         */
        if (!(pipe_config->adjusted_mode.flags &
              (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
                pipe_config->adjusted_mode.flags |= DRM_MODE_FLAG_NHSYNC;

        if (!(pipe_config->adjusted_mode.flags &
              (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
                pipe_config->adjusted_mode.flags |= DRM_MODE_FLAG_NVSYNC;

        /* Compute a starting value for pipe_config->pipe_bpp taking the source
         * plane pixel format and any sink constraints into account. Returns the
         * source plane bpp so that dithering can be selected on mismatches
         * after encoders and crtc also have had their say. */
        plane_bpp = compute_baseline_pipe_bpp(to_intel_crtc(crtc),
                                              fb, pipe_config);
        if (plane_bpp < 0)
                goto fail;

        /*
         * Determine the real pipe dimensions. Note that stereo modes can
         * increase the actual pipe size due to the frame doubling and
         * insertion of additional space for blanks between the frame. This
         * is stored in the crtc timings. We use the requested mode to do this
         * computation to clearly distinguish it from the adjusted mode, which
         * can be changed by the connectors in the below retry loop.
         */
        drm_mode_set_crtcinfo(&pipe_config->requested_mode, CRTC_STEREO_DOUBLE);
        pipe_config->pipe_src_w = pipe_config->requested_mode.crtc_hdisplay;
        pipe_config->pipe_src_h = pipe_config->requested_mode.crtc_vdisplay;

encoder_retry:
        /* Ensure the port clock defaults are reset when retrying. */
        pipe_config->port_clock = 0;
        pipe_config->pixel_multiplier = 1;

        /* Fill in default crtc timings, allow encoders to overwrite them. */
        drm_mode_set_crtcinfo(&pipe_config->adjusted_mode, CRTC_STEREO_DOUBLE);

        /* Pass our mode to the connectors and the CRTC to give them a chance to
         * adjust it according to limitations or connector properties, and also
         * a chance to reject the mode entirely.
         */
        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {

                if (&encoder->new_crtc->base != crtc)
                        continue;

                if (!(encoder->compute_config(encoder, pipe_config))) {
                        DRM_DEBUG_KMS("Encoder config failure\n");
                        goto fail;
                }
        }

        /* Set default port clock if not overwritten by the encoder. Needs to be
         * done afterwards in case the encoder adjusts the mode. */
        if (!pipe_config->port_clock)
                pipe_config->port_clock = pipe_config->adjusted_mode.crtc_clock
                        * pipe_config->pixel_multiplier;

        ret = intel_crtc_compute_config(to_intel_crtc(crtc), pipe_config);
        if (ret < 0) {
                DRM_DEBUG_KMS("CRTC fixup failed\n");
                goto fail;
        }

        if (ret == RETRY) {
                if (WARN(!retry, "loop in pipe configuration computation\n")) {
                        ret = -EINVAL;
                        goto fail;
                }

                DRM_DEBUG_KMS("CRTC bw constrained, retrying\n");
                retry = false;
                goto encoder_retry;
        }

        pipe_config->dither = pipe_config->pipe_bpp != plane_bpp;
        DRM_DEBUG_KMS("plane bpp: %i, pipe bpp: %i, dithering: %i\n",
                      plane_bpp, pipe_config->pipe_bpp, pipe_config->dither);

        return pipe_config;
fail:
        kfree(pipe_config);
        return ERR_PTR(ret);
}

/* Computes which crtcs are affected and sets the relevant bits in the mask. For
 * simplicity we use the crtc's pipe number (because it's easier to obtain). */
static void
intel_modeset_affected_pipes(struct drm_crtc *crtc, unsigned *modeset_pipes,
                             unsigned *prepare_pipes, unsigned *disable_pipes)
{
        struct intel_crtc *intel_crtc;
        struct drm_device *dev = crtc->dev;
        struct intel_encoder *encoder;
        struct intel_connector *connector;
        struct drm_crtc *tmp_crtc;

        *disable_pipes = *modeset_pipes = *prepare_pipes = 0;

        /* Check which crtcs have changed outputs connected to them, these need
         * to be part of the prepare_pipes mask. We don't (yet) support global
         * modeset across multiple crtcs, so modeset_pipes will only have one
         * bit set at most. */
        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                if (connector->base.encoder == &connector->new_encoder->base)
                        continue;

                if (connector->base.encoder) {
                        tmp_crtc = connector->base.encoder->crtc;

                        *prepare_pipes |= 1 << to_intel_crtc(tmp_crtc)->pipe;
                }

                if (connector->new_encoder)
                        *prepare_pipes |=
                                1 << connector->new_encoder->new_crtc->pipe;
        }

        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {
                if (encoder->base.crtc == &encoder->new_crtc->base)
                        continue;

                if (encoder->base.crtc) {
                        tmp_crtc = encoder->base.crtc;

                        *prepare_pipes |= 1 << to_intel_crtc(tmp_crtc)->pipe;
                }

                if (encoder->new_crtc)
                        *prepare_pipes |= 1 << encoder->new_crtc->pipe;
        }

        /* Check for pipes that will be enabled/disabled ... */
        for_each_intel_crtc(dev, intel_crtc) {
                if (intel_crtc->base.enabled == intel_crtc->new_enabled)
                        continue;

                if (!intel_crtc->new_enabled)
                        *disable_pipes |= 1 << intel_crtc->pipe;
                else
                        *prepare_pipes |= 1 << intel_crtc->pipe;
        }


        /* set_mode is also used to update properties on life display pipes. */
        intel_crtc = to_intel_crtc(crtc);
        if (intel_crtc->new_enabled)
                *prepare_pipes |= 1 << intel_crtc->pipe;

        /*
         * For simplicity do a full modeset on any pipe where the output routing
         * changed. We could be more clever, but that would require us to be
         * more careful with calling the relevant encoder->mode_set functions.
         */
        if (*prepare_pipes)
                *modeset_pipes = *prepare_pipes;

        /* ... and mask these out. */
        *modeset_pipes &= ~(*disable_pipes);
        *prepare_pipes &= ~(*disable_pipes);

        /*
         * HACK: We don't (yet) fully support global modesets. intel_set_config
         * obies this rule, but the modeset restore mode of
         * intel_modeset_setup_hw_state does not.
         */
        *modeset_pipes &= 1 << intel_crtc->pipe;
        *prepare_pipes &= 1 << intel_crtc->pipe;

        DRM_DEBUG_KMS("set mode pipe masks: modeset: %x, prepare: %x, disable: %x\n",
                      *modeset_pipes, *prepare_pipes, *disable_pipes);
}

static bool intel_crtc_in_use(struct drm_crtc *crtc)
{
        struct drm_encoder *encoder;
        struct drm_device *dev = crtc->dev;

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
                if (encoder->crtc == crtc)
                        return true;

        return false;
}

static void
intel_modeset_update_state(struct drm_device *dev, unsigned prepare_pipes)
{
        struct intel_encoder *intel_encoder;
        struct intel_crtc *intel_crtc;
        struct drm_connector *connector;

        list_for_each_entry(intel_encoder, &dev->mode_config.encoder_list,
                            base.head) {
                if (!intel_encoder->base.crtc)
                        continue;

                intel_crtc = to_intel_crtc(intel_encoder->base.crtc);

                if (prepare_pipes & (1 << intel_crtc->pipe))
                        intel_encoder->connectors_active = false;
        }

        intel_modeset_commit_output_state(dev);

        /* Double check state. */
        for_each_intel_crtc(dev, intel_crtc) {
                WARN_ON(intel_crtc->base.enabled != intel_crtc_in_use(&intel_crtc->base));
                WARN_ON(intel_crtc->new_config &&
                        intel_crtc->new_config != &intel_crtc->config);
                WARN_ON(intel_crtc->base.enabled != !!intel_crtc->new_config);
        }

        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                if (!connector->encoder || !connector->encoder->crtc)
                        continue;

                intel_crtc = to_intel_crtc(connector->encoder->crtc);

                if (prepare_pipes & (1 << intel_crtc->pipe)) {
                        struct drm_property *dpms_property =
                                dev->mode_config.dpms_property;

                        connector->dpms = DRM_MODE_DPMS_ON;
                        drm_object_property_set_value(&connector->base,
                                                         dpms_property,
                                                         DRM_MODE_DPMS_ON);

                        intel_encoder = to_intel_encoder(connector->encoder);
                        intel_encoder->connectors_active = true;
                }
        }

}

static bool intel_fuzzy_clock_check(int clock1, int clock2)
{
        int diff;

        if (clock1 == clock2)
                return true;

        if (!clock1 || !clock2)
                return false;

        diff = abs(clock1 - clock2);

        if (((((diff + clock1 + clock2) * 100)) / (clock1 + clock2)) < 105)
                return true;

        return false;
}

#define for_each_intel_crtc_masked(dev, mask, intel_crtc) \
        list_for_each_entry((intel_crtc), \
                            &(dev)->mode_config.crtc_list, \
                            base.head) \
                if (mask & (1 <<(intel_crtc)->pipe))

static bool
intel_pipe_config_compare(struct drm_device *dev,
                          struct intel_crtc_config *current_config,
                          struct intel_crtc_config *pipe_config)
{
#define PIPE_CONF_CHECK_X(name) \
        if (current_config->name != pipe_config->name) { \
                DRM_ERROR("mismatch in " #name " " \
                          "(expected 0x%08x, found 0x%08x)\n", \
                          current_config->name, \
                          pipe_config->name); \
                return false; \
        }

#define PIPE_CONF_CHECK_I(name) \
        if (current_config->name != pipe_config->name) { \
                DRM_ERROR("mismatch in " #name " " \
                          "(expected %i, found %i)\n", \
                          current_config->name, \
                          pipe_config->name); \
                return false; \
        }

#define PIPE_CONF_CHECK_FLAGS(name, mask)       \
        if ((current_config->name ^ pipe_config->name) & (mask)) { \
                DRM_ERROR("mismatch in " #name "(" #mask ") "      \
                          "(expected %i, found %i)\n", \
                          current_config->name & (mask), \
                          pipe_config->name & (mask)); \
                return false; \
        }

#define PIPE_CONF_CHECK_CLOCK_FUZZY(name) \
        if (!intel_fuzzy_clock_check(current_config->name, pipe_config->name)) { \
                DRM_ERROR("mismatch in " #name " " \
                          "(expected %i, found %i)\n", \
                          current_config->name, \
                          pipe_config->name); \
                return false; \
        }

#define PIPE_CONF_QUIRK(quirk)  \
        ((current_config->quirks | pipe_config->quirks) & (quirk))

        PIPE_CONF_CHECK_I(cpu_transcoder);

        PIPE_CONF_CHECK_I(has_pch_encoder);
        PIPE_CONF_CHECK_I(fdi_lanes);
        PIPE_CONF_CHECK_I(fdi_m_n.gmch_m);
        PIPE_CONF_CHECK_I(fdi_m_n.gmch_n);
        PIPE_CONF_CHECK_I(fdi_m_n.link_m);
        PIPE_CONF_CHECK_I(fdi_m_n.link_n);
        PIPE_CONF_CHECK_I(fdi_m_n.tu);

        PIPE_CONF_CHECK_I(has_dp_encoder);
        PIPE_CONF_CHECK_I(dp_m_n.gmch_m);
        PIPE_CONF_CHECK_I(dp_m_n.gmch_n);
        PIPE_CONF_CHECK_I(dp_m_n.link_m);
        PIPE_CONF_CHECK_I(dp_m_n.link_n);
        PIPE_CONF_CHECK_I(dp_m_n.tu);

        PIPE_CONF_CHECK_I(adjusted_mode.crtc_hdisplay);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_htotal);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_hblank_start);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_hblank_end);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_hsync_start);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_hsync_end);

        PIPE_CONF_CHECK_I(adjusted_mode.crtc_vdisplay);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_vtotal);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_vblank_start);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_vblank_end);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_vsync_start);
        PIPE_CONF_CHECK_I(adjusted_mode.crtc_vsync_end);

        PIPE_CONF_CHECK_I(pixel_multiplier);
        PIPE_CONF_CHECK_I(has_hdmi_sink);
        if ((INTEL_INFO(dev)->gen < 8 && !IS_HASWELL(dev)) ||
            IS_VALLEYVIEW(dev))
                PIPE_CONF_CHECK_I(limited_color_range);

        PIPE_CONF_CHECK_I(has_audio);

        PIPE_CONF_CHECK_FLAGS(adjusted_mode.flags,
                              DRM_MODE_FLAG_INTERLACE);

        if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS)) {
                PIPE_CONF_CHECK_FLAGS(adjusted_mode.flags,
                                      DRM_MODE_FLAG_PHSYNC);
                PIPE_CONF_CHECK_FLAGS(adjusted_mode.flags,
                                      DRM_MODE_FLAG_NHSYNC);
                PIPE_CONF_CHECK_FLAGS(adjusted_mode.flags,
                                      DRM_MODE_FLAG_PVSYNC);
                PIPE_CONF_CHECK_FLAGS(adjusted_mode.flags,
                                      DRM_MODE_FLAG_NVSYNC);
        }

        PIPE_CONF_CHECK_I(pipe_src_w);
        PIPE_CONF_CHECK_I(pipe_src_h);

        /*
         * FIXME: BIOS likes to set up a cloned config with lvds+external
         * screen. Since we don't yet re-compute the pipe config when moving
         * just the lvds port away to another pipe the sw tracking won't match.
         *
         * Proper atomic modesets with recomputed global state will fix this.
         * Until then just don't check gmch state for inherited modes.
         */
        if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_INHERITED_MODE)) {
                PIPE_CONF_CHECK_I(gmch_pfit.control);
                /* pfit ratios are autocomputed by the hw on gen4+ */
                if (INTEL_INFO(dev)->gen < 4)
                        PIPE_CONF_CHECK_I(gmch_pfit.pgm_ratios);
                PIPE_CONF_CHECK_I(gmch_pfit.lvds_border_bits);
        }

        PIPE_CONF_CHECK_I(pch_pfit.enabled);
        if (current_config->pch_pfit.enabled) {
                PIPE_CONF_CHECK_I(pch_pfit.pos);
                PIPE_CONF_CHECK_I(pch_pfit.size);
        }

        /* BDW+ don't expose a synchronous way to read the state */
        if (IS_HASWELL(dev))
                PIPE_CONF_CHECK_I(ips_enabled);

        PIPE_CONF_CHECK_I(double_wide);

        PIPE_CONF_CHECK_I(shared_dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll_md);
        PIPE_CONF_CHECK_X(dpll_hw_state.fp0);
        PIPE_CONF_CHECK_X(dpll_hw_state.fp1);

        if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5)
                PIPE_CONF_CHECK_I(pipe_bpp);

        PIPE_CONF_CHECK_CLOCK_FUZZY(adjusted_mode.crtc_clock);
        PIPE_CONF_CHECK_CLOCK_FUZZY(port_clock);

#undef PIPE_CONF_CHECK_X
#undef PIPE_CONF_CHECK_I
#undef PIPE_CONF_CHECK_FLAGS
#undef PIPE_CONF_CHECK_CLOCK_FUZZY
#undef PIPE_CONF_QUIRK

        return true;
}

static void
check_connector_state(struct drm_device *dev)
{
        struct intel_connector *connector;

        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                /* This also checks the encoder/connector hw state with the
                 * ->get_hw_state callbacks. */
                intel_connector_check_state(connector);

                WARN(&connector->new_encoder->base != connector->base.encoder,
                     "connector's staged encoder doesn't match current encoder\n");
        }
}

static void
check_encoder_state(struct drm_device *dev)
{
        struct intel_encoder *encoder;
        struct intel_connector *connector;

        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {
                bool enabled = false;
                bool active = false;
                enum pipe pipe, tracked_pipe;

                DRM_DEBUG_KMS("[ENCODER:%d:%s]\n",
                              encoder->base.base.id,
                              encoder->base.name);

                WARN(&encoder->new_crtc->base != encoder->base.crtc,
                     "encoder's stage crtc doesn't match current crtc\n");
                WARN(encoder->connectors_active && !encoder->base.crtc,
                     "encoder's active_connectors set, but no crtc\n");

                list_for_each_entry(connector, &dev->mode_config.connector_list,
                                    base.head) {
                        if (connector->base.encoder != &encoder->base)
                                continue;
                        enabled = true;
                        if (connector->base.dpms != DRM_MODE_DPMS_OFF)
                                active = true;
                }
                WARN(!!encoder->base.crtc != enabled,
                     "encoder's enabled state mismatch "
                     "(expected %i, found %i)\n",
                     !!encoder->base.crtc, enabled);
                WARN(active && !encoder->base.crtc,
                     "active encoder with no crtc\n");

                WARN(encoder->connectors_active != active,
                     "encoder's computed active state doesn't match tracked active state "
                     "(expected %i, found %i)\n", active, encoder->connectors_active);

                active = encoder->get_hw_state(encoder, &pipe);
                WARN(active != encoder->connectors_active,
                     "encoder's hw state doesn't match sw tracking "
                     "(expected %i, found %i)\n",
                     encoder->connectors_active, active);

                if (!encoder->base.crtc)
                        continue;

                tracked_pipe = to_intel_crtc(encoder->base.crtc)->pipe;
                WARN(active && pipe != tracked_pipe,
                     "active encoder's pipe doesn't match"
                     "(expected %i, found %i)\n",
                     tracked_pipe, pipe);

        }
}

static void
check_crtc_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_crtc_config pipe_config;

        for_each_intel_crtc(dev, crtc) {
                bool enabled = false;
                bool active = false;

                memset(&pipe_config, 0, sizeof(pipe_config));

                DRM_DEBUG_KMS("[CRTC:%d]\n",
                              crtc->base.base.id);

                WARN(crtc->active && !crtc->base.enabled,
                     "active crtc, but not enabled in sw tracking\n");

                list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                                    base.head) {
                        if (encoder->base.crtc != &crtc->base)
                                continue;
                        enabled = true;
                        if (encoder->connectors_active)
                                active = true;
                }

                WARN(active != crtc->active,
                     "crtc's computed active state doesn't match tracked active state "
                     "(expected %i, found %i)\n", active, crtc->active);
                WARN(enabled != crtc->base.enabled,
                     "crtc's computed enabled state doesn't match tracked enabled state "
                     "(expected %i, found %i)\n", enabled, crtc->base.enabled);

                active = dev_priv->display.get_pipe_config(crtc,
                                                           &pipe_config);

                /* hw state is inconsistent with the pipe A quirk */
                if (crtc->pipe == PIPE_A && dev_priv->quirks & QUIRK_PIPEA_FORCE)
                        active = crtc->active;

                list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                                    base.head) {
                        enum pipe pipe;
                        if (encoder->base.crtc != &crtc->base)
                                continue;
                        if (encoder->get_hw_state(encoder, &pipe))
                                encoder->get_config(encoder, &pipe_config);
                }

                WARN(crtc->active != active,
                     "crtc active state doesn't match with hw state "
                     "(expected %i, found %i)\n", crtc->active, active);

                if (active &&
                    !intel_pipe_config_compare(dev, &crtc->config, &pipe_config)) {
                        WARN(1, "pipe state doesn't match!\n");
                        intel_dump_pipe_config(crtc, &pipe_config,
                                               "[hw state]");
                        intel_dump_pipe_config(crtc, &crtc->config,
                                               "[sw state]");
                }
        }
}

static void
check_shared_dpll_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *crtc;
        struct intel_dpll_hw_state dpll_hw_state;
        int i;

        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                struct intel_shared_dpll *pll = &dev_priv->shared_dplls[i];
                int enabled_crtcs = 0, active_crtcs = 0;
                bool active;

                memset(&dpll_hw_state, 0, sizeof(dpll_hw_state));

                DRM_DEBUG_KMS("%s\n", pll->name);

                active = pll->get_hw_state(dev_priv, pll, &dpll_hw_state);

                WARN(pll->active > pll->refcount,
                     "more active pll users than references: %i vs %i\n",
                     pll->active, pll->refcount);
                WARN(pll->active && !pll->on,
                     "pll in active use but not on in sw tracking\n");
                WARN(pll->on && !pll->active,
                     "pll in on but not on in use in sw tracking\n");
                WARN(pll->on != active,
                     "pll on state mismatch (expected %i, found %i)\n",
                     pll->on, active);

                for_each_intel_crtc(dev, crtc) {
                        if (crtc->base.enabled && intel_crtc_to_shared_dpll(crtc) == pll)
                                enabled_crtcs++;
                        if (crtc->active && intel_crtc_to_shared_dpll(crtc) == pll)
                                active_crtcs++;
                }
                WARN(pll->active != active_crtcs,
                     "pll active crtcs mismatch (expected %i, found %i)\n",
                     pll->active, active_crtcs);
                WARN(pll->refcount != enabled_crtcs,
                     "pll enabled crtcs mismatch (expected %i, found %i)\n",
                     pll->refcount, enabled_crtcs);

                WARN(pll->on && memcmp(&pll->hw_state, &dpll_hw_state,
                                       sizeof(dpll_hw_state)),
                     "pll hw state mismatch\n");
        }
}

void
intel_modeset_check_state(struct drm_device *dev)
{
        check_connector_state(dev);
        check_encoder_state(dev);
        check_crtc_state(dev);
        check_shared_dpll_state(dev);
}

void ironlake_check_encoder_dotclock(const struct intel_crtc_config *pipe_config,
                                     int dotclock)
{
        /*
         * FDI already provided one idea for the dotclock.
         * Yell if the encoder disagrees.
         */
        WARN(!intel_fuzzy_clock_check(pipe_config->adjusted_mode.crtc_clock, dotclock),
             "FDI dotclock and encoder dotclock mismatch, fdi: %i, encoder: %i\n",
             pipe_config->adjusted_mode.crtc_clock, dotclock);
}

static void update_scanline_offset(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;

        /*
         * The scanline counter increments at the leading edge of hsync.
         *
         * On most platforms it starts counting from vtotal-1 on the
         * first active line. That means the scanline counter value is
         * always one less than what we would expect. Ie. just after
         * start of vblank, which also occurs at start of hsync (on the
         * last active line), the scanline counter will read vblank_start-1.
         *
         * On gen2 the scanline counter starts counting from 1 instead
         * of vtotal-1, so we have to subtract one (or rather add vtotal-1
         * to keep the value positive), instead of adding one.
         *
         * On HSW+ the behaviour of the scanline counter depends on the output
         * type. For DP ports it behaves like most other platforms, but on HDMI
         * there's an extra 1 line difference. So we need to add two instead of
         * one to the value.
         */
        if (IS_GEN2(dev)) {
                const struct drm_display_mode *mode = &crtc->config.adjusted_mode;
                int vtotal;

                vtotal = mode->crtc_vtotal;
                if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                        vtotal /= 2;

                crtc->scanline_offset = vtotal - 1;
        } else if (HAS_DDI(dev) &&
                   intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_HDMI)) {
                crtc->scanline_offset = 2;
        } else
                crtc->scanline_offset = 1;
}

static int __intel_set_mode(struct drm_crtc *crtc,
                            struct drm_display_mode *mode,
                            int x, int y, struct drm_framebuffer *fb)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_display_mode *saved_mode;
        struct intel_crtc_config *pipe_config = NULL;
        struct intel_crtc *intel_crtc;
        unsigned disable_pipes, prepare_pipes, modeset_pipes;
        int ret = 0;

        saved_mode = kmalloc(sizeof(*saved_mode), GFP_KERNEL);
        if (!saved_mode)
                return -ENOMEM;

        intel_modeset_affected_pipes(crtc, &modeset_pipes,
                                     &prepare_pipes, &disable_pipes);

        *saved_mode = crtc->mode;

        /* Hack: Because we don't (yet) support global modeset on multiple
         * crtcs, we don't keep track of the new mode for more than one crtc.
         * Hence simply check whether any bit is set in modeset_pipes in all the
         * pieces of code that are not yet converted to deal with mutliple crtcs
         * changing their mode at the same time. */
        if (modeset_pipes) {
                pipe_config = intel_modeset_pipe_config(crtc, fb, mode);
                if (IS_ERR(pipe_config)) {
                        ret = PTR_ERR(pipe_config);
                        pipe_config = NULL;

                        goto out;
                }
                intel_dump_pipe_config(to_intel_crtc(crtc), pipe_config,
                                       "[modeset]");
                to_intel_crtc(crtc)->new_config = pipe_config;
        }

        /*
         * See if the config requires any additional preparation, e.g.
         * to adjust global state with pipes off.  We need to do this
         * here so we can get the modeset_pipe updated config for the new
         * mode set on this crtc.  For other crtcs we need to use the
         * adjusted_mode bits in the crtc directly.
         */
        if (IS_VALLEYVIEW(dev)) {
                valleyview_modeset_global_pipes(dev, &prepare_pipes);

                /* may have added more to prepare_pipes than we should */
                prepare_pipes &= ~disable_pipes;
        }

        for_each_intel_crtc_masked(dev, disable_pipes, intel_crtc)
                intel_crtc_disable(&intel_crtc->base);

        for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc) {
                if (intel_crtc->base.enabled)
                        dev_priv->display.crtc_disable(&intel_crtc->base);
        }

        /* crtc->mode is already used by the ->mode_set callbacks, hence we need
         * to set it here already despite that we pass it down the callchain.
         */
        if (modeset_pipes) {
                crtc->mode = *mode;
                /* mode_set/enable/disable functions rely on a correct pipe
                 * config. */
                to_intel_crtc(crtc)->config = *pipe_config;
                to_intel_crtc(crtc)->new_config = &to_intel_crtc(crtc)->config;

                /*
                 * Calculate and store various constants which
                 * are later needed by vblank and swap-completion
                 * timestamping. They are derived from true hwmode.
                 */
                drm_calc_timestamping_constants(crtc,
                                                &pipe_config->adjusted_mode);
        }

        /* Only after disabling all output pipelines that will be changed can we
         * update the the output configuration. */
        intel_modeset_update_state(dev, prepare_pipes);

        if (dev_priv->display.modeset_global_resources)
                dev_priv->display.modeset_global_resources(dev);

        /* Set up the DPLL and any encoders state that needs to adjust or depend
         * on the DPLL.
         */
        for_each_intel_crtc_masked(dev, modeset_pipes, intel_crtc) {
                struct drm_framebuffer *old_fb;

                mutex_lock(&dev->struct_mutex);
                ret = intel_pin_and_fence_fb_obj(dev,
                                                 to_intel_framebuffer(fb)->obj,
                                                 NULL);
                if (ret != 0) {
                        DRM_ERROR("pin & fence failed\n");
                        mutex_unlock(&dev->struct_mutex);
                        goto done;
                }
                old_fb = crtc->primary->fb;
                if (old_fb)
                        intel_unpin_fb_obj(to_intel_framebuffer(old_fb)->obj);
                mutex_unlock(&dev->struct_mutex);

                crtc->primary->fb = fb;
                crtc->x = x;
                crtc->y = y;

                ret = dev_priv->display.crtc_mode_set(&intel_crtc->base,
                                                      x, y, fb);
                if (ret)
                        goto done;
        }

        /* Now enable the clocks, plane, pipe, and connectors that we set up. */
        for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc) {
                update_scanline_offset(intel_crtc);

                dev_priv->display.crtc_enable(&intel_crtc->base);
        }

        /* FIXME: add subpixel order */
done:
        if (ret && crtc->enabled)
                crtc->mode = *saved_mode;

out:
        kfree(pipe_config);
        kfree(saved_mode);
        return ret;
}

static int intel_set_mode(struct drm_crtc *crtc,
                          struct drm_display_mode *mode,
                          int x, int y, struct drm_framebuffer *fb)
{
        int ret;

        ret = __intel_set_mode(crtc, mode, x, y, fb);

        if (ret == 0)
                intel_modeset_check_state(crtc->dev);

        return ret;
}

void intel_crtc_restore_mode(struct drm_crtc *crtc)
{
        intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y, crtc->primary->fb);
}

#undef for_each_intel_crtc_masked

static void intel_set_config_free(struct intel_set_config *config)
{
        if (!config)
                return;

        kfree(config->save_connector_encoders);
        kfree(config->save_encoder_crtcs);
        kfree(config->save_crtc_enabled);
        kfree(config);
}

static int intel_set_config_save_state(struct drm_device *dev,
                                       struct intel_set_config *config)
{
        struct drm_crtc *crtc;
        struct drm_encoder *encoder;
        struct drm_connector *connector;
        int count;

        config->save_crtc_enabled =
                kcalloc(dev->mode_config.num_crtc,
                        sizeof(bool), GFP_KERNEL);
        if (!config->save_crtc_enabled)
                return -ENOMEM;

        config->save_encoder_crtcs =
                kcalloc(dev->mode_config.num_encoder,
                        sizeof(struct drm_crtc *), GFP_KERNEL);
        if (!config->save_encoder_crtcs)
                return -ENOMEM;

        config->save_connector_encoders =
                kcalloc(dev->mode_config.num_connector,
                        sizeof(struct drm_encoder *), GFP_KERNEL);
        if (!config->save_connector_encoders)
                return -ENOMEM;

        /* Copy data. Note that driver private data is not affected.
         * Should anything bad happen only the expected state is
         * restored, not the drivers personal bookkeeping.
         */
        count = 0;
        for_each_crtc(dev, crtc) {
                config->save_crtc_enabled[count++] = crtc->enabled;
        }

        count = 0;
        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
                config->save_encoder_crtcs[count++] = encoder->crtc;
        }

        count = 0;
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                config->save_connector_encoders[count++] = connector->encoder;
        }

        return 0;
}

static void intel_set_config_restore_state(struct drm_device *dev,
                                           struct intel_set_config *config)
{
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_connector *connector;
        int count;

        count = 0;
        for_each_intel_crtc(dev, crtc) {
                crtc->new_enabled = config->save_crtc_enabled[count++];

                if (crtc->new_enabled)
                        crtc->new_config = &crtc->config;
                else
                        crtc->new_config = NULL;
        }

        count = 0;
        list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
                encoder->new_crtc =
                        to_intel_crtc(config->save_encoder_crtcs[count++]);
        }

        count = 0;
        list_for_each_entry(connector, &dev->mode_config.connector_list, base.head) {
                connector->new_encoder =
                        to_intel_encoder(config->save_connector_encoders[count++]);
        }
}

static bool
is_crtc_connector_off(struct drm_mode_set *set)
{
        int i;

        if (set->num_connectors == 0)
                return false;

        if (WARN_ON(set->connectors == NULL))
                return false;

        for (i = 0; i < set->num_connectors; i++)
                if (set->connectors[i]->encoder &&
                    set->connectors[i]->encoder->crtc == set->crtc &&
                    set->connectors[i]->dpms != DRM_MODE_DPMS_ON)
                        return true;

        return false;
}

static void
intel_set_config_compute_mode_changes(struct drm_mode_set *set,
                                      struct intel_set_config *config)
{

        /* We should be able to check here if the fb has the same properties
         * and then just flip_or_move it */
        if (is_crtc_connector_off(set)) {
                config->mode_changed = true;
        } else if (set->crtc->primary->fb != set->fb) {
                /* If we have no fb then treat it as a full mode set */
                if (set->crtc->primary->fb == NULL) {
                        struct intel_crtc *intel_crtc =
                                to_intel_crtc(set->crtc);

                        if (intel_crtc->active && i915.fastboot) {
                                DRM_DEBUG_KMS("crtc has no fb, will flip\n");
                                config->fb_changed = true;
                        } else {
                                DRM_DEBUG_KMS("inactive crtc, full mode set\n");
                                config->mode_changed = true;
                        }
                } else if (set->fb == NULL) {
                        config->mode_changed = true;
                } else if (set->fb->pixel_format !=
                           set->crtc->primary->fb->pixel_format) {
                        config->mode_changed = true;
                } else {
                        config->fb_changed = true;
                }
        }

        if (set->fb && (set->x != set->crtc->x || set->y != set->crtc->y))
                config->fb_changed = true;

        if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
                DRM_DEBUG_KMS("modes are different, full mode set\n");
                drm_mode_debug_printmodeline(&set->crtc->mode);
                drm_mode_debug_printmodeline(set->mode);
                config->mode_changed = true;
        }

        DRM_DEBUG_KMS("computed changes for [CRTC:%d], mode_changed=%d, fb_changed=%d\n",
                        set->crtc->base.id, config->mode_changed, config->fb_changed);
}

static int
intel_modeset_stage_output_state(struct drm_device *dev,
                                 struct drm_mode_set *set,
                                 struct intel_set_config *config)
{
        struct intel_connector *connector;
        struct intel_encoder *encoder;
        struct intel_crtc *crtc;
        int ro;

        /* The upper layers ensure that we either disable a crtc or have a list
         * of connectors. For paranoia, double-check this. */
        WARN_ON(!set->fb && (set->num_connectors != 0));
        WARN_ON(set->fb && (set->num_connectors == 0));

        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                /* Otherwise traverse passed in connector list and get encoders
                 * for them. */
                for (ro = 0; ro < set->num_connectors; ro++) {
                        if (set->connectors[ro] == &connector->base) {
                                connector->new_encoder = connector->encoder;
                                break;
                        }
                }

                /* If we disable the crtc, disable all its connectors. Also, if
                 * the connector is on the changing crtc but not on the new
                 * connector list, disable it. */
                if ((!set->fb || ro == set->num_connectors) &&
                    connector->base.encoder &&
                    connector->base.encoder->crtc == set->crtc) {
                        connector->new_encoder = NULL;

                        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
                                connector->base.base.id,
                                connector->base.name);
                }


                if (&connector->new_encoder->base != connector->base.encoder) {
                        DRM_DEBUG_KMS("encoder changed, full mode switch\n");
                        config->mode_changed = true;
                }
        }
        /* connector->new_encoder is now updated for all connectors. */

        /* Update crtc of enabled connectors. */
        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                struct drm_crtc *new_crtc;

                if (!connector->new_encoder)
                        continue;

                new_crtc = connector->new_encoder->base.crtc;

                for (ro = 0; ro < set->num_connectors; ro++) {
                        if (set->connectors[ro] == &connector->base)
                                new_crtc = set->crtc;
                }

                /* Make sure the new CRTC will work with the encoder */
                if (!drm_encoder_crtc_ok(&connector->new_encoder->base,
                                         new_crtc)) {
                        return -EINVAL;
                }
                connector->encoder->new_crtc = to_intel_crtc(new_crtc);

                DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
                        connector->base.base.id,
                        connector->base.name,
                        new_crtc->base.id);
        }

        /* Check for any encoders that needs to be disabled. */
        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {
                int num_connectors = 0;
                list_for_each_entry(connector,
                                    &dev->mode_config.connector_list,
                                    base.head) {
                        if (connector->new_encoder == encoder) {
                                WARN_ON(!connector->new_encoder->new_crtc);
                                num_connectors++;
                        }
                }

                if (num_connectors == 0)
                        encoder->new_crtc = NULL;
                else if (num_connectors > 1)
                        return -EINVAL;

                /* Only now check for crtc changes so we don't miss encoders
                 * that will be disabled. */
                if (&encoder->new_crtc->base != encoder->base.crtc) {
                        DRM_DEBUG_KMS("crtc changed, full mode switch\n");
                        config->mode_changed = true;
                }
        }
        /* Now we've also updated encoder->new_crtc for all encoders. */

        for_each_intel_crtc(dev, crtc) {
                crtc->new_enabled = false;

                list_for_each_entry(encoder,
                                    &dev->mode_config.encoder_list,
                                    base.head) {
                        if (encoder->new_crtc == crtc) {
                                crtc->new_enabled = true;
                                break;
                        }
                }

                if (crtc->new_enabled != crtc->base.enabled) {
                        DRM_DEBUG_KMS("crtc %sabled, full mode switch\n",
                                      crtc->new_enabled ? "en" : "dis");
                        config->mode_changed = true;
                }

                if (crtc->new_enabled)
                        crtc->new_config = &crtc->config;
                else
                        crtc->new_config = NULL;
        }

        return 0;
}

static void disable_crtc_nofb(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_encoder *encoder;
        struct intel_connector *connector;

        DRM_DEBUG_KMS("Trying to restore without FB -> disabling pipe %c\n",
                      pipe_name(crtc->pipe));

        list_for_each_entry(connector, &dev->mode_config.connector_list, base.head) {
                if (connector->new_encoder &&
                    connector->new_encoder->new_crtc == crtc)
                        connector->new_encoder = NULL;
        }

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
                if (encoder->new_crtc == crtc)
                        encoder->new_crtc = NULL;
        }

        crtc->new_enabled = false;
        crtc->new_config = NULL;
}

static int intel_crtc_set_config(struct drm_mode_set *set)
{
        struct drm_device *dev;
        struct drm_mode_set save_set;
        struct intel_set_config *config;
        int ret;

        BUG_ON(!set);
        BUG_ON(!set->crtc);
        BUG_ON(!set->crtc->helper_private);

        /* Enforce sane interface api - has been abused by the fb helper. */
        BUG_ON(!set->mode && set->fb);
        BUG_ON(set->fb && set->num_connectors == 0);

        if (set->fb) {
                DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
                                set->crtc->base.id, set->fb->base.id,
                                (int)set->num_connectors, set->x, set->y);
        } else {
                DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
        }

        dev = set->crtc->dev;

        ret = -ENOMEM;
        config = kzalloc(sizeof(*config), GFP_KERNEL);
        if (!config)
                goto out_config;

        ret = intel_set_config_save_state(dev, config);
        if (ret)
                goto out_config;

        save_set.crtc = set->crtc;
        save_set.mode = &set->crtc->mode;
        save_set.x = set->crtc->x;
        save_set.y = set->crtc->y;
        save_set.fb = set->crtc->primary->fb;

        /* Compute whether we need a full modeset, only an fb base update or no
         * change at all. In the future we might also check whether only the
         * mode changed, e.g. for LVDS where we only change the panel fitter in
         * such cases. */
        intel_set_config_compute_mode_changes(set, config);

        ret = intel_modeset_stage_output_state(dev, set, config);
        if (ret)
                goto fail;

        if (config->mode_changed) {
                ret = intel_set_mode(set->crtc, set->mode,
                                     set->x, set->y, set->fb);
        } else if (config->fb_changed) {
                intel_crtc_wait_for_pending_flips(set->crtc);

                ret = intel_pipe_set_base(set->crtc,
                                          set->x, set->y, set->fb);
                /*
                 * In the fastboot case this may be our only check of the
                 * state after boot.  It would be better to only do it on
                 * the first update, but we don't have a nice way of doing that
                 * (and really, set_config isn't used much for high freq page
                 * flipping, so increasing its cost here shouldn't be a big
                 * deal).
                 */
                if (i915.fastboot && ret == 0)
                        intel_modeset_check_state(set->crtc->dev);
        }

        if (ret) {
                DRM_DEBUG_KMS("failed to set mode on [CRTC:%d], err = %d\n",
                              set->crtc->base.id, ret);
fail:
                intel_set_config_restore_state(dev, config);

                /*
                 * HACK: if the pipe was on, but we didn't have a framebuffer,
                 * force the pipe off to avoid oopsing in the modeset code
                 * due to fb==NULL. This should only happen during boot since
                 * we don't yet reconstruct the FB from the hardware state.
                 */
                if (to_intel_crtc(save_set.crtc)->new_enabled && !save_set.fb)
                        disable_crtc_nofb(to_intel_crtc(save_set.crtc));

                /* Try to restore the config */
                if (config->mode_changed &&
                    intel_set_mode(save_set.crtc, save_set.mode,
                                   save_set.x, save_set.y, save_set.fb))
                        DRM_ERROR("failed to restore config after modeset failure\n");
        }

out_config:
        intel_set_config_free(config);
        return ret;
}

static const struct drm_crtc_funcs intel_crtc_funcs = {
        .cursor_set = intel_crtc_cursor_set,
        .cursor_move = intel_crtc_cursor_move,
        .gamma_set = intel_crtc_gamma_set,
        .set_config = intel_crtc_set_config,
        .destroy = intel_crtc_destroy,
        .page_flip = intel_crtc_page_flip,
};

static void intel_cpu_pll_init(struct drm_device *dev)
{
        if (HAS_DDI(dev))
                intel_ddi_pll_init(dev);
}

static bool ibx_pch_dpll_get_hw_state(struct drm_i915_private *dev_priv,
                                      struct intel_shared_dpll *pll,
                                      struct intel_dpll_hw_state *hw_state)
{
        uint32_t val;

        val = I915_READ(PCH_DPLL(pll->id));
        hw_state->dpll = val;
        hw_state->fp0 = I915_READ(PCH_FP0(pll->id));
        hw_state->fp1 = I915_READ(PCH_FP1(pll->id));

        return val & DPLL_VCO_ENABLE;
}

static void ibx_pch_dpll_mode_set(struct drm_i915_private *dev_priv,
                                  struct intel_shared_dpll *pll)
{
        I915_WRITE(PCH_FP0(pll->id), pll->hw_state.fp0);
        I915_WRITE(PCH_FP1(pll->id), pll->hw_state.fp1);
}

static void ibx_pch_dpll_enable(struct drm_i915_private *dev_priv,
                                struct intel_shared_dpll *pll)
{
        /* PCH refclock must be enabled first */
        ibx_assert_pch_refclk_enabled(dev_priv);

        I915_WRITE(PCH_DPLL(pll->id), pll->hw_state.dpll);

        /* Wait for the clocks to stabilize. */
        POSTING_READ(PCH_DPLL(pll->id));
        udelay(150);

        /* The pixel multiplier can only be updated once the
         * DPLL is enabled and the clocks are stable.
         *
         * So write it again.
         */
        I915_WRITE(PCH_DPLL(pll->id), pll->hw_state.dpll);
        POSTING_READ(PCH_DPLL(pll->id));
        udelay(200);
}

static void ibx_pch_dpll_disable(struct drm_i915_private *dev_priv,
                                 struct intel_shared_dpll *pll)
{
        struct drm_device *dev = dev_priv->dev;
        struct intel_crtc *crtc;

        /* Make sure no transcoder isn't still depending on us. */
        for_each_intel_crtc(dev, crtc) {
                if (intel_crtc_to_shared_dpll(crtc) == pll)
                        assert_pch_transcoder_disabled(dev_priv, crtc->pipe);
        }

        I915_WRITE(PCH_DPLL(pll->id), 0);
        POSTING_READ(PCH_DPLL(pll->id));
        udelay(200);
}

static char *ibx_pch_dpll_names[] = {
        "PCH DPLL A",
        "PCH DPLL B",
};

static void ibx_pch_dpll_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        int i;

        dev_priv->num_shared_dpll = 2;

        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                dev_priv->shared_dplls[i].id = i;
                dev_priv->shared_dplls[i].name = ibx_pch_dpll_names[i];
                dev_priv->shared_dplls[i].mode_set = ibx_pch_dpll_mode_set;
                dev_priv->shared_dplls[i].enable = ibx_pch_dpll_enable;
                dev_priv->shared_dplls[i].disable = ibx_pch_dpll_disable;
                dev_priv->shared_dplls[i].get_hw_state =
                        ibx_pch_dpll_get_hw_state;
        }
}

static void intel_shared_dpll_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
                ibx_pch_dpll_init(dev);
        else
                dev_priv->num_shared_dpll = 0;

        BUG_ON(dev_priv->num_shared_dpll > I915_NUM_PLLS);
}

static void intel_crtc_init(struct drm_device *dev, int pipe)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc;
        int i;

        intel_crtc = kzalloc(sizeof(*intel_crtc), GFP_KERNEL);
        if (intel_crtc == NULL)
                return;

        drm_crtc_init(dev, &intel_crtc->base, &intel_crtc_funcs);

        drm_mode_crtc_set_gamma_size(&intel_crtc->base, 256);
        for (i = 0; i < 256; i++) {
                intel_crtc->lut_r[i] = i;
                intel_crtc->lut_g[i] = i;
                intel_crtc->lut_b[i] = i;
        }

        /*
         * On gen2/3 only plane A can do fbc, but the panel fitter and lvds port
         * is hooked to plane B. Hence we want plane A feeding pipe B.
         */
        intel_crtc->pipe = pipe;
        intel_crtc->plane = pipe;
        if (HAS_FBC(dev) && INTEL_INFO(dev)->gen < 4) {
                DRM_DEBUG_KMS("swapping pipes & planes for FBC\n");
                intel_crtc->plane = !pipe;
        }

        intel_crtc->cursor_base = ~0;
        intel_crtc->cursor_cntl = ~0;

        init_waitqueue_head(&intel_crtc->vbl_wait);

        BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
               dev_priv->plane_to_crtc_mapping[intel_crtc->plane] != NULL);
        dev_priv->plane_to_crtc_mapping[intel_crtc->plane] = &intel_crtc->base;
        dev_priv->pipe_to_crtc_mapping[intel_crtc->pipe] = &intel_crtc->base;

        drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);

        WARN_ON(drm_crtc_index(&intel_crtc->base) != intel_crtc->pipe);
}

enum pipe intel_get_pipe_from_connector(struct intel_connector *connector)
{
        struct drm_encoder *encoder = connector->base.encoder;
        struct drm_device *dev = connector->base.dev;

        WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));

        if (!encoder)
                return INVALID_PIPE;

        return to_intel_crtc(encoder->crtc)->pipe;
}

int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
                                struct drm_file *file)
{
        struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
        struct drm_mode_object *drmmode_obj;
        struct intel_crtc *crtc;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -ENODEV;

        drmmode_obj = drm_mode_object_find(dev, pipe_from_crtc_id->crtc_id,
                        DRM_MODE_OBJECT_CRTC);

        if (!drmmode_obj) {
                DRM_ERROR("no such CRTC id\n");
                return -ENOENT;
        }

        crtc = to_intel_crtc(obj_to_crtc(drmmode_obj));
        pipe_from_crtc_id->pipe = crtc->pipe;

        return 0;
}

static int intel_encoder_clones(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_encoder *source_encoder;
        int index_mask = 0;
        int entry = 0;

        list_for_each_entry(source_encoder,
                            &dev->mode_config.encoder_list, base.head) {
                if (encoders_cloneable(encoder, source_encoder))
                        index_mask |= (1 << entry);

                entry++;
        }

        return index_mask;
}

static bool has_edp_a(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (!IS_MOBILE(dev))
                return false;

        if ((I915_READ(DP_A) & DP_DETECTED) == 0)
                return false;

        if (IS_GEN5(dev) && (I915_READ(FUSE_STRAP) & ILK_eDP_A_DISABLE))
                return false;

        return true;
}

const char *intel_output_name(int output)
{
        static const char *names[] = {
                [INTEL_OUTPUT_UNUSED] = "Unused",
                [INTEL_OUTPUT_ANALOG] = "Analog",
                [INTEL_OUTPUT_DVO] = "DVO",
                [INTEL_OUTPUT_SDVO] = "SDVO",
                [INTEL_OUTPUT_LVDS] = "LVDS",
                [INTEL_OUTPUT_TVOUT] = "TV",
                [INTEL_OUTPUT_HDMI] = "HDMI",
                [INTEL_OUTPUT_DISPLAYPORT] = "DisplayPort",
                [INTEL_OUTPUT_EDP] = "eDP",
                [INTEL_OUTPUT_DSI] = "DSI",
                [INTEL_OUTPUT_UNKNOWN] = "Unknown",
        };

        if (output < 0 || output >= ARRAY_SIZE(names) || !names[output])
                return "Invalid";

        return names[output];
}

static bool intel_crt_present(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (IS_ULT(dev))
                return false;

        if (IS_CHERRYVIEW(dev))
                return false;

        if (IS_VALLEYVIEW(dev) && !dev_priv->vbt.int_crt_support)
                return false;

        return true;
}

static void intel_setup_outputs(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_encoder *encoder;
        bool dpd_is_edp = false;

        intel_lvds_init(dev);

        if (intel_crt_present(dev))
                intel_crt_init(dev);

        if (HAS_DDI(dev)) {
                int found;

                /* Haswell uses DDI functions to detect digital outputs */
                found = I915_READ(DDI_BUF_CTL_A) & DDI_INIT_DISPLAY_DETECTED;
                /* DDI A only supports eDP */
                if (found)
                        intel_ddi_init(dev, PORT_A);

                /* DDI B, C and D detection is indicated by the SFUSE_STRAP
                 * register */
                found = I915_READ(SFUSE_STRAP);

                if (found & SFUSE_STRAP_DDIB_DETECTED)
                        intel_ddi_init(dev, PORT_B);
                if (found & SFUSE_STRAP_DDIC_DETECTED)
                        intel_ddi_init(dev, PORT_C);
                if (found & SFUSE_STRAP_DDID_DETECTED)
                        intel_ddi_init(dev, PORT_D);
        } else if (HAS_PCH_SPLIT(dev)) {
                int found;
                dpd_is_edp = intel_dp_is_edp(dev, PORT_D);

                if (has_edp_a(dev))
                        intel_dp_init(dev, DP_A, PORT_A);

                if (I915_READ(PCH_HDMIB) & SDVO_DETECTED) {
                        /* PCH SDVOB multiplex with HDMIB */
                        found = intel_sdvo_init(dev, PCH_SDVOB, true);
                        if (!found)
                                intel_hdmi_init(dev, PCH_HDMIB, PORT_B);
                        if (!found && (I915_READ(PCH_DP_B) & DP_DETECTED))
                                intel_dp_init(dev, PCH_DP_B, PORT_B);
                }

                if (I915_READ(PCH_HDMIC) & SDVO_DETECTED)
                        intel_hdmi_init(dev, PCH_HDMIC, PORT_C);

                if (!dpd_is_edp && I915_READ(PCH_HDMID) & SDVO_DETECTED)
                        intel_hdmi_init(dev, PCH_HDMID, PORT_D);

                if (I915_READ(PCH_DP_C) & DP_DETECTED)
                        intel_dp_init(dev, PCH_DP_C, PORT_C);

                if (I915_READ(PCH_DP_D) & DP_DETECTED)
                        intel_dp_init(dev, PCH_DP_D, PORT_D);
        } else if (IS_VALLEYVIEW(dev)) {
                if (I915_READ(VLV_DISPLAY_BASE + GEN4_HDMIB) & SDVO_DETECTED) {
                        intel_hdmi_init(dev, VLV_DISPLAY_BASE + GEN4_HDMIB,
                                        PORT_B);
                        if (I915_READ(VLV_DISPLAY_BASE + DP_B) & DP_DETECTED)
                                intel_dp_init(dev, VLV_DISPLAY_BASE + DP_B, PORT_B);
                }

                if (I915_READ(VLV_DISPLAY_BASE + GEN4_HDMIC) & SDVO_DETECTED) {
                        intel_hdmi_init(dev, VLV_DISPLAY_BASE + GEN4_HDMIC,
                                        PORT_C);
                        if (I915_READ(VLV_DISPLAY_BASE + DP_C) & DP_DETECTED)
                                intel_dp_init(dev, VLV_DISPLAY_BASE + DP_C, PORT_C);
                }

                if (IS_CHERRYVIEW(dev)) {
                        if (I915_READ(VLV_DISPLAY_BASE + CHV_HDMID) & SDVO_DETECTED) {
                                intel_hdmi_init(dev, VLV_DISPLAY_BASE + CHV_HDMID,
                                                PORT_D);
                                if (I915_READ(VLV_DISPLAY_BASE + DP_D) & DP_DETECTED)
                                        intel_dp_init(dev, VLV_DISPLAY_BASE + DP_D, PORT_D);
                        }
                }

                intel_dsi_init(dev);
        } else if (SUPPORTS_DIGITAL_OUTPUTS(dev)) {
                bool found = false;

                if (I915_READ(GEN3_SDVOB) & SDVO_DETECTED) {
                        DRM_DEBUG_KMS("probing SDVOB\n");
                        found = intel_sdvo_init(dev, GEN3_SDVOB, true);
                        if (!found && SUPPORTS_INTEGRATED_HDMI(dev)) {
                                DRM_DEBUG_KMS("probing HDMI on SDVOB\n");
                                intel_hdmi_init(dev, GEN4_HDMIB, PORT_B);
                        }

                        if (!found && SUPPORTS_INTEGRATED_DP(dev))
                                intel_dp_init(dev, DP_B, PORT_B);
                }

                /* Before G4X SDVOC doesn't have its own detect register */

                if (I915_READ(GEN3_SDVOB) & SDVO_DETECTED) {
                        DRM_DEBUG_KMS("probing SDVOC\n");
                        found = intel_sdvo_init(dev, GEN3_SDVOC, false);
                }

                if (!found && (I915_READ(GEN3_SDVOC) & SDVO_DETECTED)) {

                        if (SUPPORTS_INTEGRATED_HDMI(dev)) {
                                DRM_DEBUG_KMS("probing HDMI on SDVOC\n");
                                intel_hdmi_init(dev, GEN4_HDMIC, PORT_C);
                        }
                        if (SUPPORTS_INTEGRATED_DP(dev))
                                intel_dp_init(dev, DP_C, PORT_C);
                }

                if (SUPPORTS_INTEGRATED_DP(dev) &&
                    (I915_READ(DP_D) & DP_DETECTED))
                        intel_dp_init(dev, DP_D, PORT_D);
        } else if (IS_GEN2(dev))
                intel_dvo_init(dev);

        if (SUPPORTS_TV(dev))
                intel_tv_init(dev);

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
                encoder->base.possible_crtcs = encoder->crtc_mask;
                encoder->base.possible_clones =
                        intel_encoder_clones(encoder);
        }

        intel_init_pch_refclk(dev);

        drm_helper_move_panel_connectors_to_head(dev);
}

static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);

        drm_framebuffer_cleanup(fb);
        WARN_ON(!intel_fb->obj->framebuffer_references--);
        drm_gem_object_unreference_unlocked(&intel_fb->obj->base);
        kfree(intel_fb);
}

static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
                                                struct drm_file *file,
                                                unsigned int *handle)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct drm_i915_gem_object *obj = intel_fb->obj;

        return drm_gem_handle_create(file, &obj->base, handle);
}

static const struct drm_framebuffer_funcs intel_fb_funcs = {
        .destroy = intel_user_framebuffer_destroy,
        .create_handle = intel_user_framebuffer_create_handle,
};

static int intel_framebuffer_init(struct drm_device *dev,
                                  struct intel_framebuffer *intel_fb,
                                  struct drm_mode_fb_cmd2 *mode_cmd,
                                  struct drm_i915_gem_object *obj)
{
        int aligned_height;
        int pitch_limit;
        int ret;

        WARN_ON(!mutex_is_locked(&dev->struct_mutex));

        if (obj->tiling_mode == I915_TILING_Y) {
                DRM_DEBUG("hardware does not support tiling Y\n");
                return -EINVAL;
        }

        if (mode_cmd->pitches[0] & 63) {
                DRM_DEBUG("pitch (%d) must be at least 64 byte aligned\n",
                          mode_cmd->pitches[0]);
                return -EINVAL;
        }

        if (INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev)) {
                pitch_limit = 32*1024;
        } else if (INTEL_INFO(dev)->gen >= 4) {
                if (obj->tiling_mode)
                        pitch_limit = 16*1024;
                else
                        pitch_limit = 32*1024;
        } else if (INTEL_INFO(dev)->gen >= 3) {
                if (obj->tiling_mode)
                        pitch_limit = 8*1024;
                else
                        pitch_limit = 16*1024;
        } else
                /* XXX DSPC is limited to 4k tiled */
                pitch_limit = 8*1024;

        if (mode_cmd->pitches[0] > pitch_limit) {
                DRM_DEBUG("%s pitch (%d) must be at less than %d\n",
                          obj->tiling_mode ? "tiled" : "linear",
                          mode_cmd->pitches[0], pitch_limit);
                return -EINVAL;
        }

        if (obj->tiling_mode != I915_TILING_NONE &&
            mode_cmd->pitches[0] != obj->stride) {
                DRM_DEBUG("pitch (%d) must match tiling stride (%d)\n",
                          mode_cmd->pitches[0], obj->stride);
                return -EINVAL;
        }

        /* Reject formats not supported by any plane early. */
        switch (mode_cmd->pixel_format) {
        case DRM_FORMAT_C8:
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                break;
        case DRM_FORMAT_XRGB1555:
        case DRM_FORMAT_ARGB1555:
                if (INTEL_INFO(dev)->gen > 3) {
                        DRM_DEBUG("unsupported pixel format: %s\n",
                                  drm_get_format_name(mode_cmd->pixel_format));
                        return -EINVAL;
                }
                break;
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ABGR8888:
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_ARGB2101010:
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_ABGR2101010:
                if (INTEL_INFO(dev)->gen < 4) {
                        DRM_DEBUG("unsupported pixel format: %s\n",
                                  drm_get_format_name(mode_cmd->pixel_format));
                        return -EINVAL;
                }
                break;
        case DRM_FORMAT_YUYV:
        case DRM_FORMAT_UYVY:
        case DRM_FORMAT_YVYU:
        case DRM_FORMAT_VYUY:
                if (INTEL_INFO(dev)->gen < 5) {
                        DRM_DEBUG("unsupported pixel format: %s\n",
                                  drm_get_format_name(mode_cmd->pixel_format));
                        return -EINVAL;
                }
                break;
        default:
                DRM_DEBUG("unsupported pixel format: %s\n",
                          drm_get_format_name(mode_cmd->pixel_format));
                return -EINVAL;
        }

        /* FIXME need to adjust LINOFF/TILEOFF accordingly. */
        if (mode_cmd->offsets[0] != 0)
                return -EINVAL;

        aligned_height = intel_align_height(dev, mode_cmd->height,
                                            obj->tiling_mode);
        /* FIXME drm helper for size checks (especially planar formats)? */
        if (obj->base.size < aligned_height * mode_cmd->pitches[0])
                return -EINVAL;

        drm_helper_mode_fill_fb_struct(&intel_fb->base, mode_cmd);
        intel_fb->obj = obj;
        intel_fb->obj->framebuffer_references++;

        ret = drm_framebuffer_init(dev, &intel_fb->base, &intel_fb_funcs);
        if (ret) {
                DRM_ERROR("framebuffer init failed %d\n", ret);
                return ret;
        }

        return 0;
}

static struct drm_framebuffer *
intel_user_framebuffer_create(struct drm_device *dev,
                              struct drm_file *filp,
                              struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_i915_gem_object *obj;

        obj = to_intel_bo(drm_gem_object_lookup(dev, filp,
                                                mode_cmd->handles[0]));
        if (&obj->base == NULL)
                return ERR_PTR(-ENOENT);

        return intel_framebuffer_create(dev, mode_cmd, obj);
}

#ifndef CONFIG_DRM_I915_FBDEV
static inline void intel_fbdev_output_poll_changed(struct drm_device *dev)
{
}
#endif

static const struct drm_mode_config_funcs intel_mode_funcs = {
        .fb_create = intel_user_framebuffer_create,
        .output_poll_changed = intel_fbdev_output_poll_changed,
};

/* Set up chip specific display functions */
static void intel_init_display(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (HAS_PCH_SPLIT(dev) || IS_G4X(dev))
                dev_priv->display.find_dpll = g4x_find_best_dpll;
        else if (IS_CHERRYVIEW(dev))
                dev_priv->display.find_dpll = chv_find_best_dpll;
        else if (IS_VALLEYVIEW(dev))
                dev_priv->display.find_dpll = vlv_find_best_dpll;
        else if (IS_PINEVIEW(dev))
                dev_priv->display.find_dpll = pnv_find_best_dpll;
        else
                dev_priv->display.find_dpll = i9xx_find_best_dpll;

        if (HAS_DDI(dev)) {
                dev_priv->display.get_pipe_config = haswell_get_pipe_config;
                dev_priv->display.get_plane_config = ironlake_get_plane_config;
                dev_priv->display.crtc_mode_set = haswell_crtc_mode_set;
                dev_priv->display.crtc_enable = haswell_crtc_enable;
                dev_priv->display.crtc_disable = haswell_crtc_disable;
                dev_priv->display.off = haswell_crtc_off;
                dev_priv->display.update_primary_plane =
                        ironlake_update_primary_plane;
        } else if (HAS_PCH_SPLIT(dev)) {
                dev_priv->display.get_pipe_config = ironlake_get_pipe_config;
                dev_priv->display.get_plane_config = ironlake_get_plane_config;
                dev_priv->display.crtc_mode_set = ironlake_crtc_mode_set;
                dev_priv->display.crtc_enable = ironlake_crtc_enable;
                dev_priv->display.crtc_disable = ironlake_crtc_disable;
                dev_priv->display.off = ironlake_crtc_off;
                dev_priv->display.update_primary_plane =
                        ironlake_update_primary_plane;
        } else if (IS_VALLEYVIEW(dev)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_plane_config = i9xx_get_plane_config;
                dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
                dev_priv->display.crtc_enable = valleyview_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
                dev_priv->display.off = i9xx_crtc_off;
                dev_priv->display.update_primary_plane =
                        i9xx_update_primary_plane;
        } else {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_plane_config = i9xx_get_plane_config;
                dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
                dev_priv->display.off = i9xx_crtc_off;
                dev_priv->display.update_primary_plane =
                        i9xx_update_primary_plane;
        }

        /* Returns the core display clock speed */
        if (IS_VALLEYVIEW(dev))
                dev_priv->display.get_display_clock_speed =
                        valleyview_get_display_clock_speed;
        else if (IS_I945G(dev) || (IS_G33(dev) && !IS_PINEVIEW_M(dev)))
                dev_priv->display.get_display_clock_speed =
                        i945_get_display_clock_speed;
        else if (IS_I915G(dev))
                dev_priv->display.get_display_clock_speed =
                        i915_get_display_clock_speed;
        else if (IS_I945GM(dev) || IS_845G(dev))
                dev_priv->display.get_display_clock_speed =
                        i9xx_misc_get_display_clock_speed;
        else if (IS_PINEVIEW(dev))
                dev_priv->display.get_display_clock_speed =
                        pnv_get_display_clock_speed;
        else if (IS_I915GM(dev))
                dev_priv->display.get_display_clock_speed =
                        i915gm_get_display_clock_speed;
        else if (IS_I865G(dev))
                dev_priv->display.get_display_clock_speed =
                        i865_get_display_clock_speed;
        else if (IS_I85X(dev))
                dev_priv->display.get_display_clock_speed =
                        i855_get_display_clock_speed;
        else /* 852, 830 */
                dev_priv->display.get_display_clock_speed =
                        i830_get_display_clock_speed;

        if (HAS_PCH_SPLIT(dev)) {
                if (IS_GEN5(dev)) {
                        dev_priv->display.fdi_link_train = ironlake_fdi_link_train;
                        dev_priv->display.write_eld = ironlake_write_eld;
                } else if (IS_GEN6(dev)) {
                        dev_priv->display.fdi_link_train = gen6_fdi_link_train;
                        dev_priv->display.write_eld = ironlake_write_eld;
                        dev_priv->display.modeset_global_resources =
                                snb_modeset_global_resources;
                } else if (IS_IVYBRIDGE(dev)) {
                        /* FIXME: detect B0+ stepping and use auto training */
                        dev_priv->display.fdi_link_train = ivb_manual_fdi_link_train;
                        dev_priv->display.write_eld = ironlake_write_eld;
                        dev_priv->display.modeset_global_resources =
                                ivb_modeset_global_resources;
                } else if (IS_HASWELL(dev) || IS_GEN8(dev)) {
                        dev_priv->display.fdi_link_train = hsw_fdi_link_train;
                        dev_priv->display.write_eld = haswell_write_eld;
                        dev_priv->display.modeset_global_resources =
                                haswell_modeset_global_resources;
                }
        } else if (IS_G4X(dev)) {
                dev_priv->display.write_eld = g4x_write_eld;
        } else if (IS_VALLEYVIEW(dev)) {
                dev_priv->display.modeset_global_resources =
                        valleyview_modeset_global_resources;
                dev_priv->display.write_eld = ironlake_write_eld;
        }

        /* Default just returns -ENODEV to indicate unsupported */
        dev_priv->display.queue_flip = intel_default_queue_flip;

        switch (INTEL_INFO(dev)->gen) {
        case 2:
                dev_priv->display.queue_flip = intel_gen2_queue_flip;
                break;

        case 3:
                dev_priv->display.queue_flip = intel_gen3_queue_flip;
                break;

        case 4:
        case 5:
                dev_priv->display.queue_flip = intel_gen4_queue_flip;
                break;

        case 6:
                dev_priv->display.queue_flip = intel_gen6_queue_flip;
                break;
        case 7:
        case 8: /* FIXME(BDW): Check that the gen8 RCS flip works. */
                dev_priv->display.queue_flip = intel_gen7_queue_flip;
                break;
        }

        intel_panel_init_backlight_funcs(dev);
}

/*
 * Some BIOSes insist on assuming the GPU's pipe A is enabled at suspend,
 * resume, or other times.  This quirk makes sure that's the case for
 * affected systems.
 */
static void quirk_pipea_force(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        dev_priv->quirks |= QUIRK_PIPEA_FORCE;
        DRM_INFO("applying pipe a force quirk\n");
}

/*
 * Some machines (Lenovo U160) do not work with SSC on LVDS for some reason
 */
static void quirk_ssc_force_disable(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        dev_priv->quirks |= QUIRK_LVDS_SSC_DISABLE;
        DRM_INFO("applying lvds SSC disable quirk\n");
}

/*
 * A machine (e.g. Acer Aspire 5734Z) may need to invert the panel backlight
 * brightness value
 */
static void quirk_invert_brightness(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        dev_priv->quirks |= QUIRK_INVERT_BRIGHTNESS;
        DRM_INFO("applying inverted panel brightness quirk\n");
}

/* Some VBT's incorrectly indicate no backlight is present */
static void quirk_backlight_present(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        dev_priv->quirks |= QUIRK_BACKLIGHT_PRESENT;
        DRM_INFO("applying backlight present quirk\n");
}

struct intel_quirk {
        int device;
        int subsystem_vendor;
        int subsystem_device;
        void (*hook)(struct drm_device *dev);
};

/* For systems that don't have a meaningful PCI subdevice/subvendor ID */
struct intel_dmi_quirk {
        void (*hook)(struct drm_device *dev);
        const struct dmi_system_id (*dmi_id_list)[];
};

static int intel_dmi_reverse_brightness(const struct dmi_system_id *id)
{
        DRM_INFO("Backlight polarity reversed on %s\n", id->ident);
        return 1;
}

static const struct intel_dmi_quirk intel_dmi_quirks[] = {
        {
                .dmi_id_list = &(const struct dmi_system_id[]) {
                        {
                                .callback = intel_dmi_reverse_brightness,
                                .ident = "NCR Corporation",
                                .matches = {DMI_MATCH(DMI_SYS_VENDOR, "NCR Corporation"),
                                            DMI_MATCH(DMI_PRODUCT_NAME, ""),
                                },
                        },
                        { }  /* terminating entry */
                },
                .hook = quirk_invert_brightness,
        },
};

static struct intel_quirk intel_quirks[] = {
        /* HP Mini needs pipe A force quirk (LP: #322104) */
        { 0x27ae, 0x103c, 0x361a, quirk_pipea_force },

        /* Toshiba Protege R-205, S-209 needs pipe A force quirk */
        { 0x2592, 0x1179, 0x0001, quirk_pipea_force },

        /* ThinkPad T60 needs pipe A force quirk (bug #16494) */
        { 0x2782, 0x17aa, 0x201a, quirk_pipea_force },

        /* Lenovo U160 cannot use SSC on LVDS */
        { 0x0046, 0x17aa, 0x3920, quirk_ssc_force_disable },

        /* Sony Vaio Y cannot use SSC on LVDS */
        { 0x0046, 0x104d, 0x9076, quirk_ssc_force_disable },

        /* Acer Aspire 5734Z must invert backlight brightness */
        { 0x2a42, 0x1025, 0x0459, quirk_invert_brightness },

        /* Acer/eMachines G725 */
        { 0x2a42, 0x1025, 0x0210, quirk_invert_brightness },

        /* Acer/eMachines e725 */
        { 0x2a42, 0x1025, 0x0212, quirk_invert_brightness },

        /* Acer/Packard Bell NCL20 */
        { 0x2a42, 0x1025, 0x034b, quirk_invert_brightness },

        /* Acer Aspire 4736Z */
        { 0x2a42, 0x1025, 0x0260, quirk_invert_brightness },

        /* Acer Aspire 5336 */
        { 0x2a42, 0x1025, 0x048a, quirk_invert_brightness },

        /* Acer C720 and C720P Chromebooks (Celeron 2955U) have backlights */
        { 0x0a06, 0x1025, 0x0a11, quirk_backlight_present },

        /* Toshiba CB35 Chromebook (Celeron 2955U) */
        { 0x0a06, 0x1179, 0x0a88, quirk_backlight_present },
};

static void intel_init_quirks(struct drm_device *dev)
{
        struct pci_dev *d = dev->pdev;
        int i;

        for (i = 0; i < ARRAY_SIZE(intel_quirks); i++) {
                struct intel_quirk *q = &intel_quirks[i];

                if (d->device == q->device &&
                    (d->subsystem_vendor == q->subsystem_vendor ||
                     q->subsystem_vendor == PCI_ANY_ID) &&
                    (d->subsystem_device == q->subsystem_device ||
                     q->subsystem_device == PCI_ANY_ID))
                        q->hook(dev);
        }
        for (i = 0; i < ARRAY_SIZE(intel_dmi_quirks); i++) {
                if (dmi_check_system(*intel_dmi_quirks[i].dmi_id_list) != 0)
                        intel_dmi_quirks[i].hook(dev);
        }
}

/* Disable the VGA plane that we never use */
static void i915_disable_vga(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u8 sr1;
        u32 vga_reg = i915_vgacntrl_reg(dev);

        /* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
        vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
        outb(SR01, VGA_SR_INDEX);
        sr1 = inb(VGA_SR_DATA);
        outb(sr1 | 1<<5, VGA_SR_DATA);
        vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
        udelay(300);

        I915_WRITE(vga_reg, VGA_DISP_DISABLE);
        POSTING_READ(vga_reg);
}

void intel_modeset_init_hw(struct drm_device *dev)
{
        intel_prepare_ddi(dev);

        intel_init_clock_gating(dev);

        intel_reset_dpio(dev);

        intel_enable_gt_powersave(dev);
}

void intel_modeset_suspend_hw(struct drm_device *dev)
{
        intel_suspend_hw(dev);
}

void intel_modeset_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        int sprite, ret;
        enum pipe pipe;
        struct intel_crtc *crtc;

        drm_mode_config_init(dev);

        dev->mode_config.min_width = 0;
        dev->mode_config.min_height = 0;

        dev->mode_config.preferred_depth = 24;
        dev->mode_config.prefer_shadow = 1;

        dev->mode_config.funcs = &intel_mode_funcs;

        intel_init_quirks(dev);

        intel_init_pm(dev);

        if (INTEL_INFO(dev)->num_pipes == 0)
                return;

        intel_init_display(dev);

        if (IS_GEN2(dev)) {
                dev->mode_config.max_width = 2048;
                dev->mode_config.max_height = 2048;
        } else if (IS_GEN3(dev)) {
                dev->mode_config.max_width = 4096;
                dev->mode_config.max_height = 4096;
        } else {
                dev->mode_config.max_width = 8192;
                dev->mode_config.max_height = 8192;
        }

        if (IS_GEN2(dev)) {
                dev->mode_config.cursor_width = GEN2_CURSOR_WIDTH;
                dev->mode_config.cursor_height = GEN2_CURSOR_HEIGHT;
        } else {
                dev->mode_config.cursor_width = MAX_CURSOR_WIDTH;
                dev->mode_config.cursor_height = MAX_CURSOR_HEIGHT;
        }

        dev->mode_config.fb_base = dev_priv->gtt.mappable_base;

        DRM_DEBUG_KMS("%d display pipe%s available.\n",
                      INTEL_INFO(dev)->num_pipes,
                      INTEL_INFO(dev)->num_pipes > 1 ? "s" : "");

        for_each_pipe(pipe) {
                intel_crtc_init(dev, pipe);
                for_each_sprite(pipe, sprite) {
                        ret = intel_plane_init(dev, pipe, sprite);
                        if (ret)
                                DRM_DEBUG_KMS("pipe %c sprite %c init failed: %d\n",
                                              pipe_name(pipe), sprite_name(pipe, sprite), ret);
                }
        }

        intel_init_dpio(dev);
        intel_reset_dpio(dev);

        intel_cpu_pll_init(dev);
        intel_shared_dpll_init(dev);

        /* Just disable it once at startup */
        i915_disable_vga(dev);
        intel_setup_outputs(dev);

        /* Just in case the BIOS is doing something questionable. */
        intel_disable_fbc(dev);

        drm_modeset_lock_all(dev);
        intel_modeset_setup_hw_state(dev, false);
        drm_modeset_unlock_all(dev);

        for_each_intel_crtc(dev, crtc) {
                if (!crtc->active)
                        continue;

                /*
                 * Note that reserving the BIOS fb up front prevents us
                 * from stuffing other stolen allocations like the ring
                 * on top.  This prevents some ugliness at boot time, and
                 * can even allow for smooth boot transitions if the BIOS
                 * fb is large enough for the active pipe configuration.
                 */
                if (dev_priv->display.get_plane_config) {
                        dev_priv->display.get_plane_config(crtc,
                                                           &crtc->plane_config);
                        /*
                         * If the fb is shared between multiple heads, we'll
                         * just get the first one.
                         */
                        intel_find_plane_obj(crtc, &crtc->plane_config);
                }
        }
}

static void intel_enable_pipe_a(struct drm_device *dev)
{
        struct intel_connector *connector;
        struct drm_connector *crt = NULL;
        struct intel_load_detect_pipe load_detect_temp;
        struct drm_modeset_acquire_ctx ctx;

        /* We can't just switch on the pipe A, we need to set things up with a
         * proper mode and output configuration. As a gross hack, enable pipe A
         * by enabling the load detect pipe once. */
        list_for_each_entry(connector,
                            &dev->mode_config.connector_list,
                            base.head) {
                if (connector->encoder->type == INTEL_OUTPUT_ANALOG) {
                        crt = &connector->base;
                        break;
                }
        }

        if (!crt)
                return;

        if (intel_get_load_detect_pipe(crt, NULL, &load_detect_temp, &ctx))
                intel_release_load_detect_pipe(crt, &load_detect_temp, &ctx);


}

static bool
intel_check_plane_mapping(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 reg, val;

        if (INTEL_INFO(dev)->num_pipes == 1)
                return true;

        reg = DSPCNTR(!crtc->plane);
        val = I915_READ(reg);

        if ((val & DISPLAY_PLANE_ENABLE) &&
            (!!(val & DISPPLANE_SEL_PIPE_MASK) == crtc->pipe))
                return false;

        return true;
}

static void intel_sanitize_crtc(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 reg;

        /* Clear any frame start delays used for debugging left by the BIOS */
        reg = PIPECONF(crtc->config.cpu_transcoder);
        I915_WRITE(reg, I915_READ(reg) & ~PIPECONF_FRAME_START_DELAY_MASK);

        /* restore vblank interrupts to correct state */
        if (crtc->active)
                drm_vblank_on(dev, crtc->pipe);
        else
                drm_vblank_off(dev, crtc->pipe);

        /* We need to sanitize the plane -> pipe mapping first because this will
         * disable the crtc (and hence change the state) if it is wrong. Note
         * that gen4+ has a fixed plane -> pipe mapping.  */
        if (INTEL_INFO(dev)->gen < 4 && !intel_check_plane_mapping(crtc)) {
                struct intel_connector *connector;
                bool plane;

                DRM_DEBUG_KMS("[CRTC:%d] wrong plane connection detected!\n",
                              crtc->base.base.id);

                /* Pipe has the wrong plane attached and the plane is active.
                 * Temporarily change the plane mapping and disable everything
                 * ...  */
                plane = crtc->plane;
                crtc->plane = !plane;
                dev_priv->display.crtc_disable(&crtc->base);
                crtc->plane = plane;

                /* ... and break all links. */
                list_for_each_entry(connector, &dev->mode_config.connector_list,
                                    base.head) {
                        if (connector->encoder->base.crtc != &crtc->base)
                                continue;

                        connector->base.dpms = DRM_MODE_DPMS_OFF;
                        connector->base.encoder = NULL;
                }
                /* multiple connectors may have the same encoder:
                 *  handle them and break crtc link separately */
                list_for_each_entry(connector, &dev->mode_config.connector_list,
                                    base.head)
                        if (connector->encoder->base.crtc == &crtc->base) {
                                connector->encoder->base.crtc = NULL;
                                connector->encoder->connectors_active = false;
                        }

                WARN_ON(crtc->active);
                crtc->base.enabled = false;
        }

        if (dev_priv->quirks & QUIRK_PIPEA_FORCE &&
            crtc->pipe == PIPE_A && !crtc->active) {
                /* BIOS forgot to enable pipe A, this mostly happens after
                 * resume. Force-enable the pipe to fix this, the update_dpms
                 * call below we restore the pipe to the right state, but leave
                 * the required bits on. */
                intel_enable_pipe_a(dev);
        }

        /* Adjust the state of the output pipe according to whether we
         * have active connectors/encoders. */
        intel_crtc_update_dpms(&crtc->base);

        if (crtc->active != crtc->base.enabled) {
                struct intel_encoder *encoder;

                /* This can happen either due to bugs in the get_hw_state
                 * functions or because the pipe is force-enabled due to the
                 * pipe A quirk. */
                DRM_DEBUG_KMS("[CRTC:%d] hw state adjusted, was %s, now %s\n",
                              crtc->base.base.id,
                              crtc->base.enabled ? "enabled" : "disabled",
                              crtc->active ? "enabled" : "disabled");

                crtc->base.enabled = crtc->active;

                /* Because we only establish the connector -> encoder ->
                 * crtc links if something is active, this means the
                 * crtc is now deactivated. Break the links. connector
                 * -> encoder links are only establish when things are
                 *  actually up, hence no need to break them. */
                WARN_ON(crtc->active);

                for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
                        WARN_ON(encoder->connectors_active);
                        encoder->base.crtc = NULL;
                }
        }

        if (crtc->active || IS_VALLEYVIEW(dev) || INTEL_INFO(dev)->gen < 5) {
                /*
                 * We start out with underrun reporting disabled to avoid races.
                 * For correct bookkeeping mark this on active crtcs.
                 *
                 * Also on gmch platforms we dont have any hardware bits to
                 * disable the underrun reporting. Which means we need to start
                 * out with underrun reporting disabled also on inactive pipes,
                 * since otherwise we'll complain about the garbage we read when
                 * e.g. coming up after runtime pm.
                 *
                 * No protection against concurrent access is required - at
                 * worst a fifo underrun happens which also sets this to false.
                 */
                crtc->cpu_fifo_underrun_disabled = true;
                crtc->pch_fifo_underrun_disabled = true;

                update_scanline_offset(crtc);
        }
}

static void intel_sanitize_encoder(struct intel_encoder *encoder)
{
        struct intel_connector *connector;
        struct drm_device *dev = encoder->base.dev;

        /* We need to check both for a crtc link (meaning that the
         * encoder is active and trying to read from a pipe) and the
         * pipe itself being active. */
        bool has_active_crtc = encoder->base.crtc &&
                to_intel_crtc(encoder->base.crtc)->active;

        if (encoder->connectors_active && !has_active_crtc) {
                DRM_DEBUG_KMS("[ENCODER:%d:%s] has active connectors but no active pipe!\n",
                              encoder->base.base.id,
                              encoder->base.name);

                /* Connector is active, but has no active pipe. This is
                 * fallout from our resume register restoring. Disable
                 * the encoder manually again. */
                if (encoder->base.crtc) {
                        DRM_DEBUG_KMS("[ENCODER:%d:%s] manually disabled\n",
                                      encoder->base.base.id,
                                      encoder->base.name);
                        encoder->disable(encoder);
                }
                encoder->base.crtc = NULL;
                encoder->connectors_active = false;

                /* Inconsistent output/port/pipe state happens presumably due to
                 * a bug in one of the get_hw_state functions. Or someplace else
                 * in our code, like the register restore mess on resume. Clamp
                 * things to off as a safer default. */
                list_for_each_entry(connector,
                                    &dev->mode_config.connector_list,
                                    base.head) {
                        if (connector->encoder != encoder)
                                continue;
                        connector->base.dpms = DRM_MODE_DPMS_OFF;
                        connector->base.encoder = NULL;
                }
        }
        /* Enabled encoders without active connectors will be fixed in
         * the crtc fixup. */
}

void i915_redisable_vga_power_on(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32 vga_reg = i915_vgacntrl_reg(dev);

        if (!(I915_READ(vga_reg) & VGA_DISP_DISABLE)) {
                DRM_DEBUG_KMS("Something enabled VGA plane, disabling it\n");
                i915_disable_vga(dev);
        }
}

void i915_redisable_vga(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        /* This function can be called both from intel_modeset_setup_hw_state or
         * at a very early point in our resume sequence, where the power well
         * structures are not yet restored. Since this function is at a very
         * paranoid "someone might have enabled VGA while we were not looking"
         * level, just check if the power well is enabled instead of trying to
         * follow the "don't touch the power well if we don't need it" policy
         * the rest of the driver uses. */
        if (!intel_display_power_enabled(dev_priv, POWER_DOMAIN_VGA))
                return;

        i915_redisable_vga_power_on(dev);
}

static bool primary_get_hw_state(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;

        if (!crtc->active)
                return false;

        return I915_READ(DSPCNTR(crtc->plane)) & DISPLAY_PLANE_ENABLE;
}

static void intel_modeset_readout_hw_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum pipe pipe;
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_connector *connector;
        int i;

        for_each_intel_crtc(dev, crtc) {
                memset(&crtc->config, 0, sizeof(crtc->config));

                crtc->config.quirks |= PIPE_CONFIG_QUIRK_INHERITED_MODE;

                crtc->active = dev_priv->display.get_pipe_config(crtc,
                                                                 &crtc->config);

                crtc->base.enabled = crtc->active;
                crtc->primary_enabled = primary_get_hw_state(crtc);

                DRM_DEBUG_KMS("[CRTC:%d] hw state readout: %s\n",
                              crtc->base.base.id,
                              crtc->active ? "enabled" : "disabled");
        }

        /* FIXME: Smash this into the new shared dpll infrastructure. */
        if (HAS_DDI(dev))
                intel_ddi_setup_hw_pll_state(dev);

        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                struct intel_shared_dpll *pll = &dev_priv->shared_dplls[i];

                pll->on = pll->get_hw_state(dev_priv, pll, &pll->hw_state);
                pll->active = 0;
                for_each_intel_crtc(dev, crtc) {
                        if (crtc->active && intel_crtc_to_shared_dpll(crtc) == pll)
                                pll->active++;
                }
                pll->refcount = pll->active;

                DRM_DEBUG_KMS("%s hw state readout: refcount %i, on %i\n",
                              pll->name, pll->refcount, pll->on);
        }

        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {
                pipe = 0;

                if (encoder->get_hw_state(encoder, &pipe)) {
                        crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
                        encoder->base.crtc = &crtc->base;
                        encoder->get_config(encoder, &crtc->config);
                } else {
                        encoder->base.crtc = NULL;
                }

                encoder->connectors_active = false;
                DRM_DEBUG_KMS("[ENCODER:%d:%s] hw state readout: %s, pipe %c\n",
                              encoder->base.base.id,
                              encoder->base.name,
                              encoder->base.crtc ? "enabled" : "disabled",
                              pipe_name(pipe));
        }

        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            base.head) {
                if (connector->get_hw_state(connector)) {
                        connector->base.dpms = DRM_MODE_DPMS_ON;
                        connector->encoder->connectors_active = true;
                        connector->base.encoder = &connector->encoder->base;
                } else {
                        connector->base.dpms = DRM_MODE_DPMS_OFF;
                        connector->base.encoder = NULL;
                }
                DRM_DEBUG_KMS("[CONNECTOR:%d:%s] hw state readout: %s\n",
                              connector->base.base.id,
                              connector->base.name,
                              connector->base.encoder ? "enabled" : "disabled");
        }
}

/* Scan out the current hw modeset state, sanitizes it and maps it into the drm
 * and i915 state tracking structures. */
void intel_modeset_setup_hw_state(struct drm_device *dev,
                                  bool force_restore)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum pipe pipe;
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        int i;

        intel_modeset_readout_hw_state(dev);

        /*
         * Now that we have the config, copy it to each CRTC struct
         * Note that this could go away if we move to using crtc_config
         * checking everywhere.
         */
        for_each_intel_crtc(dev, crtc) {
                if (crtc->active && i915.fastboot) {
                        intel_mode_from_pipe_config(&crtc->base.mode, &crtc->config);
                        DRM_DEBUG_KMS("[CRTC:%d] found active mode: ",
                                      crtc->base.base.id);
                        drm_mode_debug_printmodeline(&crtc->base.mode);
                }
        }

        /* HW state is read out, now we need to sanitize this mess. */
        list_for_each_entry(encoder, &dev->mode_config.encoder_list,
                            base.head) {
                intel_sanitize_encoder(encoder);
        }

        for_each_pipe(pipe) {
                crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
                intel_sanitize_crtc(crtc);
                intel_dump_pipe_config(crtc, &crtc->config, "[setup_hw_state]");
        }

        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                struct intel_shared_dpll *pll = &dev_priv->shared_dplls[i];

                if (!pll->on || pll->active)
                        continue;

                DRM_DEBUG_KMS("%s enabled but not in use, disabling\n", pll->name);

                pll->disable(dev_priv, pll);
                pll->on = false;
        }

        if (HAS_PCH_SPLIT(dev))
                ilk_wm_get_hw_state(dev);

        if (force_restore) {
                i915_redisable_vga(dev);

                /*
                 * We need to use raw interfaces for restoring state to avoid
                 * checking (bogus) intermediate states.
                 */
                for_each_pipe(pipe) {
                        struct drm_crtc *crtc =
                                dev_priv->pipe_to_crtc_mapping[pipe];

                        __intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y,
                                         crtc->primary->fb);
                }
        } else {
                intel_modeset_update_staged_output_state(dev);
        }

        intel_modeset_check_state(dev);
}

void intel_modeset_gem_init(struct drm_device *dev)
{
        struct drm_crtc *c;
        struct intel_framebuffer *fb;

        mutex_lock(&dev->struct_mutex);
        intel_init_gt_powersave(dev);
        mutex_unlock(&dev->struct_mutex);

        intel_modeset_init_hw(dev);

        intel_setup_overlay(dev);

        /*
         * Make sure any fbs we allocated at startup are properly
         * pinned & fenced.  When we do the allocation it's too early
         * for this.
         */
        mutex_lock(&dev->struct_mutex);
        for_each_crtc(dev, c) {
                if (!c->primary->fb)
                        continue;

                fb = to_intel_framebuffer(c->primary->fb);
                if (intel_pin_and_fence_fb_obj(dev, fb->obj, NULL)) {
                        DRM_ERROR("failed to pin boot fb on pipe %d\n",
                                  to_intel_crtc(c)->pipe);
                        drm_framebuffer_unreference(c->primary->fb);
                        c->primary->fb = NULL;
                }
        }
        mutex_unlock(&dev->struct_mutex);
}

void intel_connector_unregister(struct intel_connector *intel_connector)
{
        struct drm_connector *connector = &intel_connector->base;

        intel_panel_destroy_backlight(connector);
        drm_sysfs_connector_remove(connector);
}

void intel_modeset_cleanup(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_crtc *crtc;
        struct drm_connector *connector;

        /*
         * Interrupts and polling as the first thing to avoid creating havoc.
         * Too much stuff here (turning of rps, connectors, ...) would
         * experience fancy races otherwise.
         */
        drm_irq_uninstall(dev);
        cancel_work_sync(&dev_priv->hotplug_work);
        /*
         * Due to the hpd irq storm handling the hotplug work can re-arm the
         * poll handlers. Hence disable polling after hpd handling is shut down.
         */
        drm_kms_helper_poll_fini(dev);

        mutex_lock(&dev->struct_mutex);

        intel_unregister_dsm_handler();

        for_each_crtc(dev, crtc) {
                /* Skip inactive CRTCs */
                if (!crtc->primary->fb)
                        continue;

                intel_increase_pllclock(crtc);
        }

        intel_disable_fbc(dev);

        intel_disable_gt_powersave(dev);

        ironlake_teardown_rc6(dev);

        mutex_unlock(&dev->struct_mutex);

        /* flush any delayed tasks or pending work */
        flush_scheduled_work();

        /* destroy the backlight and sysfs files before encoders/connectors */
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                struct intel_connector *intel_connector;

                intel_connector = to_intel_connector(connector);
                intel_connector->unregister(intel_connector);
        }

        drm_mode_config_cleanup(dev);

        intel_cleanup_overlay(dev);

        mutex_lock(&dev->struct_mutex);
        intel_cleanup_gt_powersave(dev);
        mutex_unlock(&dev->struct_mutex);
}

/*
 * Return which encoder is currently attached for connector.
 */
struct drm_encoder *intel_best_encoder(struct drm_connector *connector)
{
        return &intel_attached_encoder(connector)->base;
}

void intel_connector_attach_encoder(struct intel_connector *connector,
                                    struct intel_encoder *encoder)
{
        connector->encoder = encoder;
        drm_mode_connector_attach_encoder(&connector->base,
                                          &encoder->base);
}

/*
 * set vga decode state - true == enable VGA decode
 */
int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        unsigned reg = INTEL_INFO(dev)->gen >= 6 ? SNB_GMCH_CTRL : INTEL_GMCH_CTRL;
        u16 gmch_ctrl;

        if (pci_read_config_word(dev_priv->bridge_dev, reg, &gmch_ctrl)) {
                DRM_ERROR("failed to read control word\n");
                return -EIO;
        }

        if (!!(gmch_ctrl & INTEL_GMCH_VGA_DISABLE) == !state)
                return 0;

        if (state)
                gmch_ctrl &= ~INTEL_GMCH_VGA_DISABLE;
        else
                gmch_ctrl |= INTEL_GMCH_VGA_DISABLE;

        if (pci_write_config_word(dev_priv->bridge_dev, reg, gmch_ctrl)) {
                DRM_ERROR("failed to write control word\n");
                return -EIO;
        }

        return 0;
}

struct intel_display_error_state {

        u32 power_well_driver;

        int num_transcoders;

        struct intel_cursor_error_state {
                u32 control;
                u32 position;
                u32 base;
                u32 size;
        } cursor[I915_MAX_PIPES];

        struct intel_pipe_error_state {
                bool power_domain_on;
                u32 source;
                u32 stat;
        } pipe[I915_MAX_PIPES];

        struct intel_plane_error_state {
                u32 control;
                u32 stride;
                u32 size;
                u32 pos;
                u32 addr;
                u32 surface;
                u32 tile_offset;
        } plane[I915_MAX_PIPES];

        struct intel_transcoder_error_state {
                bool power_domain_on;
                enum transcoder cpu_transcoder;

                u32 conf;

                u32 htotal;
                u32 hblank;
                u32 hsync;
                u32 vtotal;
                u32 vblank;
                u32 vsync;
        } transcoder[4];
};

struct intel_display_error_state *
intel_display_capture_error_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_display_error_state *error;
        int transcoders[] = {
                TRANSCODER_A,
                TRANSCODER_B,
                TRANSCODER_C,
                TRANSCODER_EDP,
        };
        int i;

        if (INTEL_INFO(dev)->num_pipes == 0)
                return NULL;

        error = kzalloc(sizeof(*error), GFP_ATOMIC);
        if (error == NULL)
                return NULL;

        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                error->power_well_driver = I915_READ(HSW_PWR_WELL_DRIVER);

        for_each_pipe(i) {
                error->pipe[i].power_domain_on =
                        intel_display_power_enabled_unlocked(dev_priv,
                                                           POWER_DOMAIN_PIPE(i));
                if (!error->pipe[i].power_domain_on)
                        continue;

                error->cursor[i].control = I915_READ(CURCNTR(i));
                error->cursor[i].position = I915_READ(CURPOS(i));
                error->cursor[i].base = I915_READ(CURBASE(i));

                error->plane[i].control = I915_READ(DSPCNTR(i));
                error->plane[i].stride = I915_READ(DSPSTRIDE(i));
                if (INTEL_INFO(dev)->gen <= 3) {
                        error->plane[i].size = I915_READ(DSPSIZE(i));
                        error->plane[i].pos = I915_READ(DSPPOS(i));
                }
                if (INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev))
                        error->plane[i].addr = I915_READ(DSPADDR(i));
                if (INTEL_INFO(dev)->gen >= 4) {
                        error->plane[i].surface = I915_READ(DSPSURF(i));
                        error->plane[i].tile_offset = I915_READ(DSPTILEOFF(i));
                }

                error->pipe[i].source = I915_READ(PIPESRC(i));

                if (!HAS_PCH_SPLIT(dev))
                        error->pipe[i].stat = I915_READ(PIPESTAT(i));
        }

        error->num_transcoders = INTEL_INFO(dev)->num_pipes;
        if (HAS_DDI(dev_priv->dev))
                error->num_transcoders++; /* Account for eDP. */

        for (i = 0; i < error->num_transcoders; i++) {
                enum transcoder cpu_transcoder = transcoders[i];

                error->transcoder[i].power_domain_on =
                        intel_display_power_enabled_unlocked(dev_priv,
                                POWER_DOMAIN_TRANSCODER(cpu_transcoder));
                if (!error->transcoder[i].power_domain_on)
                        continue;

                error->transcoder[i].cpu_transcoder = cpu_transcoder;

                error->transcoder[i].conf = I915_READ(PIPECONF(cpu_transcoder));
                error->transcoder[i].htotal = I915_READ(HTOTAL(cpu_transcoder));
                error->transcoder[i].hblank = I915_READ(HBLANK(cpu_transcoder));
                error->transcoder[i].hsync = I915_READ(HSYNC(cpu_transcoder));
                error->transcoder[i].vtotal = I915_READ(VTOTAL(cpu_transcoder));
                error->transcoder[i].vblank = I915_READ(VBLANK(cpu_transcoder));
                error->transcoder[i].vsync = I915_READ(VSYNC(cpu_transcoder));
        }

        return error;
}

#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)

void
intel_display_print_error_state(struct drm_i915_error_state_buf *m,
                                struct drm_device *dev,
                                struct intel_display_error_state *error)
{
        int i;

        if (!error)
                return;

        err_printf(m, "Num Pipes: %d\n", INTEL_INFO(dev)->num_pipes);
        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                err_printf(m, "PWR_WELL_CTL2: %08x\n",
                           error->power_well_driver);
        for_each_pipe(i) {
                err_printf(m, "Pipe [%d]:\n", i);
                err_printf(m, "  Power: %s\n",
                           error->pipe[i].power_domain_on ? "on" : "off");
                err_printf(m, "  SRC: %08x\n", error->pipe[i].source);
                err_printf(m, "  STAT: %08x\n", error->pipe[i].stat);

                err_printf(m, "Plane [%d]:\n", i);
                err_printf(m, "  CNTR: %08x\n", error->plane[i].control);
                err_printf(m, "  STRIDE: %08x\n", error->plane[i].stride);
                if (INTEL_INFO(dev)->gen <= 3) {
                        err_printf(m, "  SIZE: %08x\n", error->plane[i].size);
                        err_printf(m, "  POS: %08x\n", error->plane[i].pos);
                }
                if (INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev))
                        err_printf(m, "  ADDR: %08x\n", error->plane[i].addr);
                if (INTEL_INFO(dev)->gen >= 4) {
                        err_printf(m, "  SURF: %08x\n", error->plane[i].surface);
                        err_printf(m, "  TILEOFF: %08x\n", error->plane[i].tile_offset);
                }

                err_printf(m, "Cursor [%d]:\n", i);
                err_printf(m, "  CNTR: %08x\n", error->cursor[i].control);
                err_printf(m, "  POS: %08x\n", error->cursor[i].position);
                err_printf(m, "  BASE: %08x\n", error->cursor[i].base);
        }

        for (i = 0; i < error->num_transcoders; i++) {
                err_printf(m, "CPU transcoder: %c\n",
                           transcoder_name(error->transcoder[i].cpu_transcoder));
                err_printf(m, "  Power: %s\n",
                           error->transcoder[i].power_domain_on ? "on" : "off");
                err_printf(m, "  CONF: %08x\n", error->transcoder[i].conf);
                err_printf(m, "  HTOTAL: %08x\n", error->transcoder[i].htotal);
                err_printf(m, "  HBLANK: %08x\n", error->transcoder[i].hblank);
                err_printf(m, "  HSYNC: %08x\n", error->transcoder[i].hsync);
                err_printf(m, "  VTOTAL: %08x\n", error->transcoder[i].vtotal);
                err_printf(m, "  VBLANK: %08x\n", error->transcoder[i].vblank);
                err_printf(m, "  VSYNC: %08x\n", error->transcoder[i].vsync);
        }
}