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

/*
 * Copyright © 2006-2010 Intel Corporation
 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
 *
 * 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>
 *      Dave Airlie <airlied@linux.ie>
 *      Jesse Barnes <jesse.barnes@intel.com>
 *      Chris Wilson <chris@chris-wilson.co.uk>
 */

#include "intel_drv.h"

#define PCI_LBPC 0xf4 /* legacy/combination backlight modes */

void
intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
		       struct drm_display_mode *adjusted_mode)
{
	adjusted_mode->hdisplay = fixed_mode->hdisplay;
	adjusted_mode->hsync_start = fixed_mode->hsync_start;
	adjusted_mode->hsync_end = fixed_mode->hsync_end;
	adjusted_mode->htotal = fixed_mode->htotal;

	adjusted_mode->vdisplay = fixed_mode->vdisplay;
	adjusted_mode->vsync_start = fixed_mode->vsync_start;
	adjusted_mode->vsync_end = fixed_mode->vsync_end;
	adjusted_mode->vtotal = fixed_mode->vtotal;

	adjusted_mode->clock = fixed_mode->clock;

	drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
}

/* adjusted_mode has been preset to be the panel's fixed mode */
void
intel_pch_panel_fitting(struct drm_device *dev,
			int fitting_mode,
			struct drm_display_mode *mode,
			struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int x, y, width, height;

	x = y = width = height = 0;

	/* Native modes don't need fitting */
	if (adjusted_mode->hdisplay == mode->hdisplay &&
	    adjusted_mode->vdisplay == mode->vdisplay)
		goto done;

	switch (fitting_mode) {
	case DRM_MODE_SCALE_CENTER:
		width = mode->hdisplay;
		height = mode->vdisplay;
		x = (adjusted_mode->hdisplay - width + 1)/2;
		y = (adjusted_mode->vdisplay - height + 1)/2;
		break;

	case DRM_MODE_SCALE_ASPECT:
		/* Scale but preserve the aspect ratio */
		{
			u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
			u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
			if (scaled_width > scaled_height) { /* pillar */
				width = scaled_height / mode->vdisplay;
				x = (adjusted_mode->hdisplay - width + 1) / 2;
				y = 0;
				height = adjusted_mode->vdisplay;
			} else if (scaled_width < scaled_height) { /* letter */
				height = scaled_width / mode->hdisplay;
				y = (adjusted_mode->vdisplay - height + 1) / 2;
				x = 0;
				width = adjusted_mode->hdisplay;
			} else {
				x = y = 0;
				width = adjusted_mode->hdisplay;
				height = adjusted_mode->vdisplay;
			}
		}
		break;

	default:
	case DRM_MODE_SCALE_FULLSCREEN:
		x = y = 0;
		width = adjusted_mode->hdisplay;
		height = adjusted_mode->vdisplay;
		break;
	}

done:
	dev_priv->pch_pf_pos = (x << 16) | y;
	dev_priv->pch_pf_size = (width << 16) | height;
}

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

	if (INTEL_INFO(dev)->gen >= 4)
		return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;

	if (IS_GEN2(dev))
		return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;

	return 0;
}

static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
{
	u32 val;

	/* Restore the CTL value if it lost, e.g. GPU reset */

	if (HAS_PCH_SPLIT(dev_priv->dev)) {
		val = I915_READ(BLC_PWM_PCH_CTL2);
		if (dev_priv->saveBLC_PWM_CTL2 == 0) {
			dev_priv->saveBLC_PWM_CTL2 = val;
		} else if (val == 0) {
			I915_WRITE(BLC_PWM_PCH_CTL2,
				   dev_priv->saveBLC_PWM_CTL);
			val = dev_priv->saveBLC_PWM_CTL;
		}
	} else {
		val = I915_READ(BLC_PWM_CTL);
		if (dev_priv->saveBLC_PWM_CTL == 0) {
			dev_priv->saveBLC_PWM_CTL = val;
			dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
		} else if (val == 0) {
			I915_WRITE(BLC_PWM_CTL,
				   dev_priv->saveBLC_PWM_CTL);
			I915_WRITE(BLC_PWM_CTL2,
				   dev_priv->saveBLC_PWM_CTL2);
			val = dev_priv->saveBLC_PWM_CTL;
		}
	}

	return val;
}

u32 intel_panel_get_max_backlight(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 max;

	max = i915_read_blc_pwm_ctl(dev_priv);
	if (max == 0) {
		/* XXX add code here to query mode clock or hardware clock
		 * and program max PWM appropriately.
		 */
		printk_once(KERN_WARNING "fixme: max PWM is zero.\n");
		return 1;
	}

	if (HAS_PCH_SPLIT(dev)) {
		max >>= 16;
	} else {
		if (IS_PINEVIEW(dev)) {
			max >>= 17;
		} else {
			max >>= 16;
			if (INTEL_INFO(dev)->gen < 4)
				max &= ~1;
		}

		if (is_backlight_combination_mode(dev))
			max *= 0xff;
	}

	DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
	return max;
}

u32 intel_panel_get_backlight(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 val;

	if (HAS_PCH_SPLIT(dev)) {
		val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
	} else {
		val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
		if (IS_PINEVIEW(dev))
			val >>= 1;

		if (is_backlight_combination_mode(dev)){
			u8 lbpc;

			val &= ~1;
			pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
			val *= lbpc;
			val >>= 1;
		}
	}

	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
	return val;
}

static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
	I915_WRITE(BLC_PWM_CPU_CTL, val | level);
}

void intel_panel_set_backlight(struct drm_device *dev, u32 level)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 tmp;

	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);

	if (HAS_PCH_SPLIT(dev))
		return intel_pch_panel_set_backlight(dev, level);

	if (is_backlight_combination_mode(dev)){
		u32 max = intel_panel_get_max_backlight(dev);
		u8 lpbc;

		lpbc = level * 0xfe / max + 1;
		level /= lpbc;
		pci_write_config_byte(dev->pdev, PCI_LBPC, lpbc);
	}

	tmp = I915_READ(BLC_PWM_CTL);
	if (IS_PINEVIEW(dev)) {
		tmp &= ~(BACKLIGHT_DUTY_CYCLE_MASK - 1);
		level <<= 1;
	} else
		tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
	I915_WRITE(BLC_PWM_CTL, tmp | level);
}

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

	if (dev_priv->backlight_enabled) {
		dev_priv->backlight_level = intel_panel_get_backlight(dev);
		dev_priv->backlight_enabled = false;
	}

	intel_panel_set_backlight(dev, 0);
}

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

	if (dev_priv->backlight_level == 0)
		dev_priv->backlight_level = intel_panel_get_max_backlight(dev);

	intel_panel_set_backlight(dev, dev_priv->backlight_level);
	dev_priv->backlight_enabled = true;
}

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

	dev_priv->backlight_level = intel_panel_get_backlight(dev);
	dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
}
Commit	Line	Data
1d8e1c75 CW	1	/*
	2	* Copyright © 2006-2010 Intel Corporation
	3	* Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the "Software"),
	7	* to deal in the Software without restriction, including without limitation
	8	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	9	* and/or sell copies of the Software, and to permit persons to whom the
	10	* Software is furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice (including the next
	13	* paragraph) shall be included in all copies or substantial portions of the
	14	* Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	21	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	22	* DEALINGS IN THE SOFTWARE.
	23	*
	24	* Authors:
	25	* Eric Anholt <eric@anholt.net>
	26	* Dave Airlie <airlied@linux.ie>
	27	* Jesse Barnes <jesse.barnes@intel.com>
	28	* Chris Wilson <chris@chris-wilson.co.uk>
	29	*/
	30
	31	#include "intel_drv.h"
	32
a9573556 CW	33	#define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
a9573556 CW	34
1d8e1c75 CW	35	void
	36	intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
	37	struct drm_display_mode *adjusted_mode)
	38	{
	39	adjusted_mode->hdisplay = fixed_mode->hdisplay;
	40	adjusted_mode->hsync_start = fixed_mode->hsync_start;
	41	adjusted_mode->hsync_end = fixed_mode->hsync_end;
	42	adjusted_mode->htotal = fixed_mode->htotal;
	43
	44	adjusted_mode->vdisplay = fixed_mode->vdisplay;
	45	adjusted_mode->vsync_start = fixed_mode->vsync_start;
	46	adjusted_mode->vsync_end = fixed_mode->vsync_end;
	47	adjusted_mode->vtotal = fixed_mode->vtotal;
	48
	49	adjusted_mode->clock = fixed_mode->clock;
	50
	51	drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
	52	}
	53
	54	/* adjusted_mode has been preset to be the panel's fixed mode */
	55	void
	56	intel_pch_panel_fitting(struct drm_device *dev,
	57	int fitting_mode,
	58	struct drm_display_mode *mode,
	59	struct drm_display_mode *adjusted_mode)
	60	{
	61	struct drm_i915_private *dev_priv = dev->dev_private;
	62	int x, y, width, height;
	63
	64	x = y = width = height = 0;
	65
	66	/* Native modes don't need fitting */
	67	if (adjusted_mode->hdisplay == mode->hdisplay &&
	68	adjusted_mode->vdisplay == mode->vdisplay)
	69	goto done;
	70
	71	switch (fitting_mode) {
	72	case DRM_MODE_SCALE_CENTER:
	73	width = mode->hdisplay;
	74	height = mode->vdisplay;
	75	x = (adjusted_mode->hdisplay - width + 1)/2;
	76	y = (adjusted_mode->vdisplay - height + 1)/2;
	77	break;
	78
	79	case DRM_MODE_SCALE_ASPECT:
	80	/* Scale but preserve the aspect ratio */
	81	{
	82	u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
	83	u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
	84	if (scaled_width > scaled_height) { /* pillar */
	85	width = scaled_height / mode->vdisplay;
	86	x = (adjusted_mode->hdisplay - width + 1) / 2;
	87	y = 0;
	88	height = adjusted_mode->vdisplay;
	89	} else if (scaled_width < scaled_height) { /* letter */
	90	height = scaled_width / mode->hdisplay;
	91	y = (adjusted_mode->vdisplay - height + 1) / 2;
	92	x = 0;
	93	width = adjusted_mode->hdisplay;
	94	} else {
	95	x = y = 0;
	96	width = adjusted_mode->hdisplay;
	97	height = adjusted_mode->vdisplay;
	98	}
99	}
100	break;
101
102	default:
103	case DRM_MODE_SCALE_FULLSCREEN:
104	x = y = 0;
105	width = adjusted_mode->hdisplay;
106	height = adjusted_mode->vdisplay;
107	break;
108	}
109
110	done:
111	dev_priv->pch_pf_pos = (x << 16) \| y;
112	dev_priv->pch_pf_size = (width << 16) \| height;
113	}
a9573556 CW	114
	115	static int is_backlight_combination_mode(struct drm_device *dev)
	116	{
	117	struct drm_i915_private *dev_priv = dev->dev_private;
	118
a6c45cf0	119	if (INTEL_INFO(dev)->gen >= 4)
a9573556 CW	120	return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
	121
	122	if (IS_GEN2(dev))
	123	return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
	124
	125	return 0;
	126	}
	127
0b0b053a CW	128	static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
	129	{
	130	u32 val;
	131
	132	/* Restore the CTL value if it lost, e.g. GPU reset */
	133
	134	if (HAS_PCH_SPLIT(dev_priv->dev)) {
	135	val = I915_READ(BLC_PWM_PCH_CTL2);
	136	if (dev_priv->saveBLC_PWM_CTL2 == 0) {
	137	dev_priv->saveBLC_PWM_CTL2 = val;
	138	} else if (val == 0) {
	139	I915_WRITE(BLC_PWM_PCH_CTL2,
	140	dev_priv->saveBLC_PWM_CTL);
	141	val = dev_priv->saveBLC_PWM_CTL;
	142	}
	143	} else {
	144	val = I915_READ(BLC_PWM_CTL);
	145	if (dev_priv->saveBLC_PWM_CTL == 0) {
	146	dev_priv->saveBLC_PWM_CTL = val;
	147	dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
	148	} else if (val == 0) {
	149	I915_WRITE(BLC_PWM_CTL,
	150	dev_priv->saveBLC_PWM_CTL);
	151	I915_WRITE(BLC_PWM_CTL2,
	152	dev_priv->saveBLC_PWM_CTL2);
	153	val = dev_priv->saveBLC_PWM_CTL;
	154	}
	155	}
	156
	157	return val;
	158	}
	159
a9573556 CW	160	u32 intel_panel_get_max_backlight(struct drm_device *dev)
	161	{
	162	struct drm_i915_private *dev_priv = dev->dev_private;
	163	u32 max;
	164
0b0b053a CW	165	max = i915_read_blc_pwm_ctl(dev_priv);
	166	if (max == 0) {
	167	/* XXX add code here to query mode clock or hardware clock
	168	* and program max PWM appropriately.
	169	*/
	170	printk_once(KERN_WARNING "fixme: max PWM is zero.\n");
	171	return 1;
	172	}
	173
a9573556	174	if (HAS_PCH_SPLIT(dev)) {
0b0b053a	175	max >>= 16;
a9573556	176	} else {
a9573556 CW	177	if (IS_PINEVIEW(dev)) {
	178	max >>= 17;
	179	} else {
	180	max >>= 16;
a6c45cf0	181	if (INTEL_INFO(dev)->gen < 4)
a9573556 CW	182	max &= ~1;
	183	}
	184
	185	if (is_backlight_combination_mode(dev))
	186	max *= 0xff;
	187	}
	188
a9573556 CW	189	DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
	190	return max;
	191	}
	192
	193	u32 intel_panel_get_backlight(struct drm_device *dev)
	194	{
	195	struct drm_i915_private *dev_priv = dev->dev_private;
	196	u32 val;
	197
	198	if (HAS_PCH_SPLIT(dev)) {
	199	val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
	200	} else {
	201	val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
	202	if (IS_PINEVIEW(dev))
	203	val >>= 1;
	204
	205	if (is_backlight_combination_mode(dev)){
	206	u8 lbpc;
	207
	208	val &= ~1;
	209	pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
	210	val *= lbpc;
	211	val >>= 1;
	212	}
	213	}
	214
	215	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
	216	return val;
	217	}
	218
	219	static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
	220	{
	221	struct drm_i915_private *dev_priv = dev->dev_private;
	222	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
	223	I915_WRITE(BLC_PWM_CPU_CTL, val \| level);
	224	}
	225
	226	void intel_panel_set_backlight(struct drm_device *dev, u32 level)
	227	{
	228	struct drm_i915_private *dev_priv = dev->dev_private;
	229	u32 tmp;
	230
	231	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
	232
	233	if (HAS_PCH_SPLIT(dev))
	234	return intel_pch_panel_set_backlight(dev, level);
	235
	236	if (is_backlight_combination_mode(dev)){
	237	u32 max = intel_panel_get_max_backlight(dev);
	238	u8 lpbc;
	239
	240	lpbc = level * 0xfe / max + 1;
	241	level /= lpbc;
	242	pci_write_config_byte(dev->pdev, PCI_LBPC, lpbc);
	243	}
	244
	245	tmp = I915_READ(BLC_PWM_CTL);
	246	if (IS_PINEVIEW(dev)) {
	247	tmp &= ~(BACKLIGHT_DUTY_CYCLE_MASK - 1);
	248	level <<= 1;
	249	} else
	250	tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
	251	I915_WRITE(BLC_PWM_CTL, tmp \| level);
	252	}
47356eb6 CW	253
	254	void intel_panel_disable_backlight(struct drm_device *dev)
	255	{
	256	struct drm_i915_private *dev_priv = dev->dev_private;
	257
	258	if (dev_priv->backlight_enabled) {
	259	dev_priv->backlight_level = intel_panel_get_backlight(dev);
	260	dev_priv->backlight_enabled = false;
	261	}
	262
	263	intel_panel_set_backlight(dev, 0);
	264	}
	265
	266	void intel_panel_enable_backlight(struct drm_device *dev)
	267	{
	268	struct drm_i915_private *dev_priv = dev->dev_private;
	269
	270	if (dev_priv->backlight_level == 0)
	271	dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
	272
	273	intel_panel_set_backlight(dev, dev_priv->backlight_level);
	274	dev_priv->backlight_enabled = true;
	275	}
	276
	277	void intel_panel_setup_backlight(struct drm_device *dev)
	278	{
	279	struct drm_i915_private *dev_priv = dev->dev_private;
	280
c8303e7f	281	dev_priv->backlight_level = intel_panel_get_backlight(dev);
47356eb6 CW	282	dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
47356eb6 CW	283	}