[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>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/moduleparam.h>
#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;
}

/* adjusted_mode has been preset to be the panel's fixed mode */
void
intel_pch_panel_fitting(struct drm_device *dev,
			int fitting_mode,
			const 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;
				if (width & 1)
					width++;
				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;
				if (height & 1)
				    height++;
				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_CTL2);
			val = dev_priv->saveBLC_PWM_CTL2;
		}
	} 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.
		 */
		pr_warn_once("fixme: max PWM is zero\n");
		return 1;
	}

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

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

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

static int i915_panel_invert_brightness;
MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
	"report PCI device ID, subsystem vendor and subsystem device ID "
	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
	"It will then be included in an upcoming module version.");
module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	if (i915_panel_invert_brightness < 0)
		return val;

	if (i915_panel_invert_brightness > 0 ||
	    dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
		return intel_panel_get_max_backlight(dev) - val;

	return val;
}

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 (INTEL_INFO(dev)->gen < 4)
			val >>= 1;

		if (is_backlight_combination_mode(dev)) {
			u8 lbpc;

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

	val = intel_panel_compute_brightness(dev, val);
	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);
}

static void intel_panel_actually_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);
	level = intel_panel_compute_brightness(dev, 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 lbpc;

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

	tmp = I915_READ(BLC_PWM_CTL);
	if (INTEL_INFO(dev)->gen < 4) 
		level <<= 1;
	tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
	I915_WRITE(BLC_PWM_CTL, tmp | level);
}

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

	dev_priv->backlight_level = level;
	if (dev_priv->backlight_enabled)
		intel_panel_actually_set_backlight(dev, level);
}

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

	dev_priv->backlight_enabled = false;
	intel_panel_actually_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);

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

static void intel_panel_init_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;
}

enum drm_connector_status
intel_panel_detect(struct drm_device *dev)
{
#if 0
	struct drm_i915_private *dev_priv = dev->dev_private;
#endif

	if (i915_panel_ignore_lid)
		return i915_panel_ignore_lid > 0 ?
			connector_status_connected :
			connector_status_disconnected;

	/* opregion lid state on HP 2540p is wrong at boot up,
	 * appears to be either the BIOS or Linux ACPI fault */
#if 0
	/* Assume that the BIOS does not lie through the OpRegion... */
	if (dev_priv->opregion.lid_state)
		return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
			connector_status_connected :
			connector_status_disconnected;
#endif

	return connector_status_unknown;
}

#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
static int intel_panel_update_status(struct backlight_device *bd)
{
	struct drm_device *dev = bl_get_data(bd);
	intel_panel_set_backlight(dev, bd->props.brightness);
	return 0;
}

static int intel_panel_get_brightness(struct backlight_device *bd)
{
	struct drm_device *dev = bl_get_data(bd);
	struct drm_i915_private *dev_priv = dev->dev_private;
	return dev_priv->backlight_level;
}

static const struct backlight_ops intel_panel_bl_ops = {
	.update_status = intel_panel_update_status,
	.get_brightness = intel_panel_get_brightness,
};

int intel_panel_setup_backlight(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct backlight_properties props;
	struct drm_connector *connector;

	intel_panel_init_backlight(dev);

	if (dev_priv->int_lvds_connector)
		connector = dev_priv->int_lvds_connector;
	else if (dev_priv->int_edp_connector)
		connector = dev_priv->int_edp_connector;
	else
		return -ENODEV;

	memset(&props, 0, sizeof(props));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = intel_panel_get_max_backlight(dev);
	dev_priv->backlight =
		backlight_device_register("intel_backlight",
					  &connector->kdev, dev,
					  &intel_panel_bl_ops, &props);

	if (IS_ERR(dev_priv->backlight)) {
		DRM_ERROR("Failed to register backlight: %ld\n",
			  PTR_ERR(dev_priv->backlight));
		dev_priv->backlight = NULL;
		return -ENODEV;
	}
	dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
	return 0;
}

void intel_panel_destroy_backlight(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	if (dev_priv->backlight)
		backlight_device_unregister(dev_priv->backlight);
}
#else
int intel_panel_setup_backlight(struct drm_device *dev)
{
	intel_panel_init_backlight(dev);
	return 0;
}

void intel_panel_destroy_backlight(struct drm_device *dev)
{
	return;
}
#endif
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
a70491cc JP	31	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a70491cc JP	32
7bd90909	33	#include <linux/moduleparam.h>
1d8e1c75 CW	34	#include "intel_drv.h"
1d8e1c75 CW	35
ba3820ad TI	36	#define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
ba3820ad TI	37
1d8e1c75 CW	38	void
	39	intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
	40	struct drm_display_mode *adjusted_mode)
	41	{
	42	adjusted_mode->hdisplay = fixed_mode->hdisplay;
	43	adjusted_mode->hsync_start = fixed_mode->hsync_start;
	44	adjusted_mode->hsync_end = fixed_mode->hsync_end;
	45	adjusted_mode->htotal = fixed_mode->htotal;
	46
	47	adjusted_mode->vdisplay = fixed_mode->vdisplay;
	48	adjusted_mode->vsync_start = fixed_mode->vsync_start;
	49	adjusted_mode->vsync_end = fixed_mode->vsync_end;
	50	adjusted_mode->vtotal = fixed_mode->vtotal;
	51
	52	adjusted_mode->clock = fixed_mode->clock;
1d8e1c75 CW	53	}
	54
	55	/* adjusted_mode has been preset to be the panel's fixed mode */
	56	void
	57	intel_pch_panel_fitting(struct drm_device *dev,
	58	int fitting_mode,
cb1793ce	59	const struct drm_display_mode *mode,
1d8e1c75 CW	60	struct drm_display_mode *adjusted_mode)
	61	{
	62	struct drm_i915_private *dev_priv = dev->dev_private;
	63	int x, y, width, height;
	64
	65	x = y = width = height = 0;
	66
	67	/* Native modes don't need fitting */
	68	if (adjusted_mode->hdisplay == mode->hdisplay &&
	69	adjusted_mode->vdisplay == mode->vdisplay)
	70	goto done;
	71
	72	switch (fitting_mode) {
	73	case DRM_MODE_SCALE_CENTER:
	74	width = mode->hdisplay;
	75	height = mode->vdisplay;
	76	x = (adjusted_mode->hdisplay - width + 1)/2;
	77	y = (adjusted_mode->vdisplay - height + 1)/2;
	78	break;
	79
	80	case DRM_MODE_SCALE_ASPECT:
	81	/* Scale but preserve the aspect ratio */
	82	{
	83	u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
	84	u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
	85	if (scaled_width > scaled_height) { /* pillar */
	86	width = scaled_height / mode->vdisplay;
302983e9	87	if (width & 1)
0206e353	88	width++;
1d8e1c75 CW	89	x = (adjusted_mode->hdisplay - width + 1) / 2;
	90	y = 0;
	91	height = adjusted_mode->vdisplay;
	92	} else if (scaled_width < scaled_height) { /* letter */
	93	height = scaled_width / mode->hdisplay;
302983e9 AJ	94	if (height & 1)
302983e9 AJ	95	height++;
1d8e1c75 CW	96	y = (adjusted_mode->vdisplay - height + 1) / 2;
	97	x = 0;
	98	width = adjusted_mode->hdisplay;
	99	} else {
	100	x = y = 0;
	101	width = adjusted_mode->hdisplay;
	102	height = adjusted_mode->vdisplay;
	103	}
	104	}
	105	break;
	106
	107	default:
	108	case DRM_MODE_SCALE_FULLSCREEN:
	109	x = y = 0;
	110	width = adjusted_mode->hdisplay;
	111	height = adjusted_mode->vdisplay;
	112	break;
	113	}
	114
	115	done:
	116	dev_priv->pch_pf_pos = (x << 16) \| y;
	117	dev_priv->pch_pf_size = (width << 16) \| height;
	118	}
a9573556	119
ba3820ad TI	120	static int is_backlight_combination_mode(struct drm_device *dev)
	121	{
	122	struct drm_i915_private *dev_priv = dev->dev_private;
	123
	124	if (INTEL_INFO(dev)->gen >= 4)
	125	return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
	126
	127	if (IS_GEN2(dev))
	128	return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
	129
	130	return 0;
	131	}
	132
0b0b053a CW	133	static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
	134	{
	135	u32 val;
	136
	137	/* Restore the CTL value if it lost, e.g. GPU reset */
	138
	139	if (HAS_PCH_SPLIT(dev_priv->dev)) {
	140	val = I915_READ(BLC_PWM_PCH_CTL2);
	141	if (dev_priv->saveBLC_PWM_CTL2 == 0) {
	142	dev_priv->saveBLC_PWM_CTL2 = val;
	143	} else if (val == 0) {
	144	I915_WRITE(BLC_PWM_PCH_CTL2,
2aded1b6 SQ	145	dev_priv->saveBLC_PWM_CTL2);
2aded1b6 SQ	146	val = dev_priv->saveBLC_PWM_CTL2;
0b0b053a CW	147	}
	148	} else {
	149	val = I915_READ(BLC_PWM_CTL);
	150	if (dev_priv->saveBLC_PWM_CTL == 0) {
	151	dev_priv->saveBLC_PWM_CTL = val;
	152	dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
	153	} else if (val == 0) {
	154	I915_WRITE(BLC_PWM_CTL,
	155	dev_priv->saveBLC_PWM_CTL);
	156	I915_WRITE(BLC_PWM_CTL2,
	157	dev_priv->saveBLC_PWM_CTL2);
	158	val = dev_priv->saveBLC_PWM_CTL;
	159	}
	160	}
	161
	162	return val;
	163	}
	164
a9573556 CW	165	u32 intel_panel_get_max_backlight(struct drm_device *dev)
	166	{
	167	struct drm_i915_private *dev_priv = dev->dev_private;
	168	u32 max;
	169
0b0b053a CW	170	max = i915_read_blc_pwm_ctl(dev_priv);
	171	if (max == 0) {
	172	/* XXX add code here to query mode clock or hardware clock
	173	* and program max PWM appropriately.
	174	*/
a70491cc	175	pr_warn_once("fixme: max PWM is zero\n");
0b0b053a CW	176	return 1;
	177	}
	178
a9573556	179	if (HAS_PCH_SPLIT(dev)) {
0b0b053a	180	max >>= 16;
a9573556	181	} else {
ca88479c	182	if (INTEL_INFO(dev)->gen < 4)
a9573556	183	max >>= 17;
ca88479c	184	else
a9573556	185	max >>= 16;
ba3820ad TI	186
	187	if (is_backlight_combination_mode(dev))
	188	max *= 0xff;
a9573556 CW	189	}
a9573556 CW	190
a9573556 CW	191	DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
	192	return max;
	193	}
	194
4dca20ef CE	195	static int i915_panel_invert_brightness;
	196	MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
	197	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
7bd90909 CE	198	"report PCI device ID, subsystem vendor and subsystem device ID "
	199	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
	200	"It will then be included in an upcoming module version.");
4dca20ef	201	module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
7bd90909 CE	202	static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
7bd90909 CE	203	{
4dca20ef CE	204	struct drm_i915_private *dev_priv = dev->dev_private;
	205
	206	if (i915_panel_invert_brightness < 0)
	207	return val;
	208
	209	if (i915_panel_invert_brightness > 0 \|\|
	210	dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
7bd90909 CE	211	return intel_panel_get_max_backlight(dev) - val;
	212
	213	return val;
	214	}
	215
a9573556 CW	216	u32 intel_panel_get_backlight(struct drm_device *dev)
	217	{
	218	struct drm_i915_private *dev_priv = dev->dev_private;
	219	u32 val;
	220
	221	if (HAS_PCH_SPLIT(dev)) {
	222	val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
	223	} else {
	224	val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
ca88479c	225	if (INTEL_INFO(dev)->gen < 4)
a9573556	226	val >>= 1;
ba3820ad	227
0206e353	228	if (is_backlight_combination_mode(dev)) {
ba3820ad TI	229	u8 lbpc;
ba3820ad TI	230
ba3820ad TI	231	pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
	232	val *= lbpc;
	233	}
a9573556 CW	234	}
a9573556 CW	235
7bd90909	236	val = intel_panel_compute_brightness(dev, val);
a9573556 CW	237	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
	238	return val;
	239	}
	240
	241	static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
	242	{
	243	struct drm_i915_private *dev_priv = dev->dev_private;
	244	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
	245	I915_WRITE(BLC_PWM_CPU_CTL, val \| level);
	246	}
	247
f52c619a	248	static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
a9573556 CW	249	{
	250	struct drm_i915_private *dev_priv = dev->dev_private;
	251	u32 tmp;
	252
	253	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
7bd90909	254	level = intel_panel_compute_brightness(dev, level);
a9573556 CW	255
	256	if (HAS_PCH_SPLIT(dev))
	257	return intel_pch_panel_set_backlight(dev, level);
ba3820ad	258
0206e353	259	if (is_backlight_combination_mode(dev)) {
ba3820ad TI	260	u32 max = intel_panel_get_max_backlight(dev);
	261	u8 lbpc;
	262
	263	lbpc = level * 0xfe / max + 1;
	264	level /= lbpc;
	265	pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
	266	}
	267
a9573556	268	tmp = I915_READ(BLC_PWM_CTL);
ca88479c	269	if (INTEL_INFO(dev)->gen < 4)
a9573556	270	level <<= 1;
ca88479c	271	tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
a9573556 CW	272	I915_WRITE(BLC_PWM_CTL, tmp \| level);
a9573556 CW	273	}
47356eb6	274
f52c619a	275	void intel_panel_set_backlight(struct drm_device *dev, u32 level)
47356eb6 CW	276	{
	277	struct drm_i915_private *dev_priv = dev->dev_private;
	278
f52c619a TI	279	dev_priv->backlight_level = level;
	280	if (dev_priv->backlight_enabled)
	281	intel_panel_actually_set_backlight(dev, level);
	282	}
	283
	284	void intel_panel_disable_backlight(struct drm_device *dev)
	285	{
	286	struct drm_i915_private *dev_priv = dev->dev_private;
47356eb6	287
f52c619a TI	288	dev_priv->backlight_enabled = false;
f52c619a TI	289	intel_panel_actually_set_backlight(dev, 0);
47356eb6 CW	290	}
	291
	292	void intel_panel_enable_backlight(struct drm_device *dev)
	293	{
	294	struct drm_i915_private *dev_priv = dev->dev_private;
	295
	296	if (dev_priv->backlight_level == 0)
	297	dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
	298
47356eb6	299	dev_priv->backlight_enabled = true;
f52c619a	300	intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
47356eb6 CW	301	}
47356eb6 CW	302
aaa6fd2a	303	static void intel_panel_init_backlight(struct drm_device *dev)
47356eb6 CW	304	{
	305	struct drm_i915_private *dev_priv = dev->dev_private;
	306
c8303e7f	307	dev_priv->backlight_level = intel_panel_get_backlight(dev);
47356eb6 CW	308	dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
47356eb6 CW	309	}
fe16d949 CW	310
	311	enum drm_connector_status
	312	intel_panel_detect(struct drm_device *dev)
	313	{
bcd5023c	314	#if 0
fe16d949	315	struct drm_i915_private *dev_priv = dev->dev_private;
bcd5023c	316	#endif
fe16d949	317
fca87409 CW	318	if (i915_panel_ignore_lid)
	319	return i915_panel_ignore_lid > 0 ?
	320	connector_status_connected :
	321	connector_status_disconnected;
	322
bcd5023c DA	323	/* opregion lid state on HP 2540p is wrong at boot up,
	324	* appears to be either the BIOS or Linux ACPI fault */
	325	#if 0
fe16d949 CW	326	/* Assume that the BIOS does not lie through the OpRegion... */
	327	if (dev_priv->opregion.lid_state)
	328	return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
	329	connector_status_connected :
	330	connector_status_disconnected;
bcd5023c	331	#endif
fe16d949 CW	332
	333	return connector_status_unknown;
	334	}
aaa6fd2a MG	335
	336	#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
	337	static int intel_panel_update_status(struct backlight_device *bd)
	338	{
	339	struct drm_device *dev = bl_get_data(bd);
	340	intel_panel_set_backlight(dev, bd->props.brightness);
	341	return 0;
	342	}
	343
	344	static int intel_panel_get_brightness(struct backlight_device *bd)
	345	{
	346	struct drm_device *dev = bl_get_data(bd);
04b38670 TI	347	struct drm_i915_private *dev_priv = dev->dev_private;
04b38670 TI	348	return dev_priv->backlight_level;
aaa6fd2a MG	349	}
	350
	351	static const struct backlight_ops intel_panel_bl_ops = {
	352	.update_status = intel_panel_update_status,
	353	.get_brightness = intel_panel_get_brightness,
	354	};
	355
	356	int intel_panel_setup_backlight(struct drm_device *dev)
	357	{
	358	struct drm_i915_private *dev_priv = dev->dev_private;
	359	struct backlight_properties props;
	360	struct drm_connector *connector;
	361
	362	intel_panel_init_backlight(dev);
	363
	364	if (dev_priv->int_lvds_connector)
	365	connector = dev_priv->int_lvds_connector;
	366	else if (dev_priv->int_edp_connector)
	367	connector = dev_priv->int_edp_connector;
	368	else
	369	return -ENODEV;
	370
af437cfd	371	memset(&props, 0, sizeof(props));
aaa6fd2a MG	372	props.type = BACKLIGHT_RAW;
	373	props.max_brightness = intel_panel_get_max_backlight(dev);
	374	dev_priv->backlight =
	375	backlight_device_register("intel_backlight",
	376	&connector->kdev, dev,
	377	&intel_panel_bl_ops, &props);
	378
	379	if (IS_ERR(dev_priv->backlight)) {
	380	DRM_ERROR("Failed to register backlight: %ld\n",
	381	PTR_ERR(dev_priv->backlight));
	382	dev_priv->backlight = NULL;
	383	return -ENODEV;
	384	}
	385	dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
	386	return 0;
	387	}
	388
	389	void intel_panel_destroy_backlight(struct drm_device *dev)
	390	{
	391	struct drm_i915_private *dev_priv = dev->dev_private;
	392	if (dev_priv->backlight)
	393	backlight_device_unregister(dev_priv->backlight);
	394	}
	395	#else
	396	int intel_panel_setup_backlight(struct drm_device *dev)
	397	{
	398	intel_panel_init_backlight(dev);
	399	return 0;
	400	}
	401
	402	void intel_panel_destroy_backlight(struct drm_device *dev)
	403	{
	404	return;
	405	}
	406	#endif