[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;
}

static 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 (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;
	}

	return max;
}

u32 intel_panel_get_max_backlight(struct drm_device *dev)
{
	u32 max;

	max = _intel_panel_get_max_backlight(dev);
	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;
	}

	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;
}

static 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);

	if (INTEL_INFO(dev)->gen >= 4) {
		uint32_t reg, tmp;

		reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;

		I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);

		if (HAS_PCH_SPLIT(dev)) {
			tmp = I915_READ(BLC_PWM_PCH_CTL1);
			tmp &= ~BLM_PCH_PWM_ENABLE;
			I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
		}
	}
}

void intel_panel_enable_backlight(struct drm_device *dev,
				  enum pipe pipe)
{
	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);

	if (INTEL_INFO(dev)->gen >= 4) {
		uint32_t reg, tmp;

		reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;


		tmp = I915_READ(reg);

		/* Note that this can also get called through dpms changes. And
		 * we don't track the backlight dpms state, hence check whether
		 * we have to do anything first. */
		if (tmp & BLM_PWM_ENABLE)
			goto set_level;

		if (dev_priv->num_pipe == 3)
			tmp &= ~BLM_PIPE_SELECT_IVB;
		else
			tmp &= ~BLM_PIPE_SELECT;

		tmp |= BLM_PIPE(pipe);
		tmp &= ~BLM_PWM_ENABLE;

		I915_WRITE(reg, tmp);
		POSTING_READ(reg);
		I915_WRITE(reg, tmp | BLM_PWM_ENABLE);

		if (HAS_PCH_SPLIT(dev)) {
			tmp = I915_READ(BLC_PWM_PCH_CTL1);
			tmp |= BLM_PCH_PWM_ENABLE;
			tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
			I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
		}
	}

set_level:
	/* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
	 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
	 * registers are set.
	 */
	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);
	if (props.max_brightness == 0) {
		DRM_ERROR("Failed to get maximum backlight value\n");
		return -ENODEV;
	}
	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
28dcc2d6	165	static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
a9573556 CW	166	{
	167	struct drm_i915_private *dev_priv = dev->dev_private;
	168	u32 max;
	169
0b0b053a	170	max = i915_read_blc_pwm_ctl(dev_priv);
0b0b053a	171
a9573556	172	if (HAS_PCH_SPLIT(dev)) {
0b0b053a	173	max >>= 16;
a9573556	174	} else {
ca88479c	175	if (INTEL_INFO(dev)->gen < 4)
a9573556	176	max >>= 17;
ca88479c	177	else
a9573556	178	max >>= 16;
ba3820ad TI	179
	180	if (is_backlight_combination_mode(dev))
	181	max *= 0xff;
a9573556 CW	182	}
a9573556 CW	183
28dcc2d6 JN	184	return max;
	185	}
	186
	187	u32 intel_panel_get_max_backlight(struct drm_device *dev)
	188	{
	189	u32 max;
	190
	191	max = _intel_panel_get_max_backlight(dev);
	192	if (max == 0) {
	193	/* XXX add code here to query mode clock or hardware clock
	194	* and program max PWM appropriately.
	195	*/
	196	pr_warn_once("fixme: max PWM is zero\n");
	197	return 1;
	198	}
	199
a9573556 CW	200	DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
	201	return max;
	202	}
	203
4dca20ef CE	204	static int i915_panel_invert_brightness;
	205	MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
	206	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
7bd90909 CE	207	"report PCI device ID, subsystem vendor and subsystem device ID "
	208	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
	209	"It will then be included in an upcoming module version.");
4dca20ef	210	module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
7bd90909 CE	211	static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
7bd90909 CE	212	{
4dca20ef CE	213	struct drm_i915_private *dev_priv = dev->dev_private;
	214
	215	if (i915_panel_invert_brightness < 0)
	216	return val;
	217
	218	if (i915_panel_invert_brightness > 0 \|\|
	219	dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
7bd90909 CE	220	return intel_panel_get_max_backlight(dev) - val;
	221
	222	return val;
	223	}
	224
faea35dd	225	static u32 intel_panel_get_backlight(struct drm_device *dev)
a9573556 CW	226	{
	227	struct drm_i915_private *dev_priv = dev->dev_private;
	228	u32 val;
	229
	230	if (HAS_PCH_SPLIT(dev)) {
	231	val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
	232	} else {
	233	val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
ca88479c	234	if (INTEL_INFO(dev)->gen < 4)
a9573556	235	val >>= 1;
ba3820ad	236
0206e353	237	if (is_backlight_combination_mode(dev)) {
ba3820ad TI	238	u8 lbpc;
ba3820ad TI	239
ba3820ad TI	240	pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
	241	val *= lbpc;
	242	}
a9573556 CW	243	}
a9573556 CW	244
7bd90909	245	val = intel_panel_compute_brightness(dev, val);
a9573556 CW	246	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
	247	return val;
	248	}
	249
	250	static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
	251	{
	252	struct drm_i915_private *dev_priv = dev->dev_private;
	253	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
	254	I915_WRITE(BLC_PWM_CPU_CTL, val \| level);
	255	}
	256
f52c619a	257	static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
a9573556 CW	258	{
	259	struct drm_i915_private *dev_priv = dev->dev_private;
	260	u32 tmp;
	261
	262	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
7bd90909	263	level = intel_panel_compute_brightness(dev, level);
a9573556 CW	264
	265	if (HAS_PCH_SPLIT(dev))
	266	return intel_pch_panel_set_backlight(dev, level);
ba3820ad	267
0206e353	268	if (is_backlight_combination_mode(dev)) {
ba3820ad TI	269	u32 max = intel_panel_get_max_backlight(dev);
	270	u8 lbpc;
	271
	272	lbpc = level * 0xfe / max + 1;
	273	level /= lbpc;
	274	pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
	275	}
	276
a9573556	277	tmp = I915_READ(BLC_PWM_CTL);
ca88479c	278	if (INTEL_INFO(dev)->gen < 4)
a9573556	279	level <<= 1;
ca88479c	280	tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
a9573556 CW	281	I915_WRITE(BLC_PWM_CTL, tmp \| level);
a9573556 CW	282	}
47356eb6	283
f52c619a	284	void intel_panel_set_backlight(struct drm_device *dev, u32 level)
47356eb6 CW	285	{
	286	struct drm_i915_private *dev_priv = dev->dev_private;
	287
f52c619a TI	288	dev_priv->backlight_level = level;
	289	if (dev_priv->backlight_enabled)
	290	intel_panel_actually_set_backlight(dev, level);
	291	}
	292
	293	void intel_panel_disable_backlight(struct drm_device *dev)
	294	{
	295	struct drm_i915_private *dev_priv = dev->dev_private;
47356eb6	296
f52c619a TI	297	dev_priv->backlight_enabled = false;
f52c619a TI	298	intel_panel_actually_set_backlight(dev, 0);
24ded204 DV	299
24ded204 DV	300	if (INTEL_INFO(dev)->gen >= 4) {
a4f32fc3	301	uint32_t reg, tmp;
24ded204 DV	302
	303	reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
	304
	305	I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
a4f32fc3 PZ	306
	307	if (HAS_PCH_SPLIT(dev)) {
	308	tmp = I915_READ(BLC_PWM_PCH_CTL1);
	309	tmp &= ~BLM_PCH_PWM_ENABLE;
	310	I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
	311	}
24ded204	312	}
47356eb6 CW	313	}
47356eb6 CW	314
24ded204 DV	315	void intel_panel_enable_backlight(struct drm_device *dev,
24ded204 DV	316	enum pipe pipe)
47356eb6 CW	317	{
	318	struct drm_i915_private *dev_priv = dev->dev_private;
	319
	320	if (dev_priv->backlight_level == 0)
	321	dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
	322
24ded204 DV	323	if (INTEL_INFO(dev)->gen >= 4) {
	324	uint32_t reg, tmp;
	325
	326	reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
	327
	328
	329	tmp = I915_READ(reg);
	330
	331	/* Note that this can also get called through dpms changes. And
	332	* we don't track the backlight dpms state, hence check whether
	333	* we have to do anything first. */
	334	if (tmp & BLM_PWM_ENABLE)
770c1231	335	goto set_level;
24ded204 DV	336
	337	if (dev_priv->num_pipe == 3)
	338	tmp &= ~BLM_PIPE_SELECT_IVB;
	339	else
	340	tmp &= ~BLM_PIPE_SELECT;
	341
	342	tmp \|= BLM_PIPE(pipe);
	343	tmp &= ~BLM_PWM_ENABLE;
	344
	345	I915_WRITE(reg, tmp);
	346	POSTING_READ(reg);
	347	I915_WRITE(reg, tmp \| BLM_PWM_ENABLE);
a4f32fc3 PZ	348
	349	if (HAS_PCH_SPLIT(dev)) {
	350	tmp = I915_READ(BLC_PWM_PCH_CTL1);
	351	tmp \|= BLM_PCH_PWM_ENABLE;
	352	tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
	353	I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
	354	}
24ded204	355	}
770c1231 TI	356
	357	set_level:
	358	/* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
	359	* BLC_PWM_CPU_CTL may be cleared to zero automatically when these
	360	* registers are set.
	361	*/
	362	dev_priv->backlight_enabled = true;
	363	intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
47356eb6 CW	364	}
47356eb6 CW	365
aaa6fd2a	366	static void intel_panel_init_backlight(struct drm_device *dev)
47356eb6 CW	367	{
	368	struct drm_i915_private *dev_priv = dev->dev_private;
	369
c8303e7f	370	dev_priv->backlight_level = intel_panel_get_backlight(dev);
47356eb6 CW	371	dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
47356eb6 CW	372	}
fe16d949 CW	373
	374	enum drm_connector_status
	375	intel_panel_detect(struct drm_device *dev)
	376	{
bcd5023c	377	#if 0
fe16d949	378	struct drm_i915_private *dev_priv = dev->dev_private;
bcd5023c	379	#endif
fe16d949	380
fca87409 CW	381	if (i915_panel_ignore_lid)
	382	return i915_panel_ignore_lid > 0 ?
	383	connector_status_connected :
	384	connector_status_disconnected;
	385
bcd5023c DA	386	/* opregion lid state on HP 2540p is wrong at boot up,
	387	* appears to be either the BIOS or Linux ACPI fault */
	388	#if 0
fe16d949 CW	389	/* Assume that the BIOS does not lie through the OpRegion... */
	390	if (dev_priv->opregion.lid_state)
	391	return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
	392	connector_status_connected :
	393	connector_status_disconnected;
bcd5023c	394	#endif
fe16d949 CW	395
	396	return connector_status_unknown;
	397	}
aaa6fd2a MG	398
	399	#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
	400	static int intel_panel_update_status(struct backlight_device *bd)
	401	{
	402	struct drm_device *dev = bl_get_data(bd);
	403	intel_panel_set_backlight(dev, bd->props.brightness);
	404	return 0;
	405	}
	406
	407	static int intel_panel_get_brightness(struct backlight_device *bd)
	408	{
	409	struct drm_device *dev = bl_get_data(bd);
04b38670 TI	410	struct drm_i915_private *dev_priv = dev->dev_private;
04b38670 TI	411	return dev_priv->backlight_level;
aaa6fd2a MG	412	}
	413
	414	static const struct backlight_ops intel_panel_bl_ops = {
	415	.update_status = intel_panel_update_status,
	416	.get_brightness = intel_panel_get_brightness,
	417	};
	418
	419	int intel_panel_setup_backlight(struct drm_device *dev)
	420	{
	421	struct drm_i915_private *dev_priv = dev->dev_private;
	422	struct backlight_properties props;
	423	struct drm_connector *connector;
	424
	425	intel_panel_init_backlight(dev);
	426
	427	if (dev_priv->int_lvds_connector)
	428	connector = dev_priv->int_lvds_connector;
	429	else if (dev_priv->int_edp_connector)
	430	connector = dev_priv->int_edp_connector;
	431	else
	432	return -ENODEV;
	433
af437cfd	434	memset(&props, 0, sizeof(props));
aaa6fd2a	435	props.type = BACKLIGHT_RAW;
28dcc2d6 JN	436	props.max_brightness = _intel_panel_get_max_backlight(dev);
	437	if (props.max_brightness == 0) {
	438	DRM_ERROR("Failed to get maximum backlight value\n");
	439	return -ENODEV;
	440	}
aaa6fd2a MG	441	dev_priv->backlight =
	442	backlight_device_register("intel_backlight",
	443	&connector->kdev, dev,
	444	&intel_panel_bl_ops, &props);
	445
	446	if (IS_ERR(dev_priv->backlight)) {
	447	DRM_ERROR("Failed to register backlight: %ld\n",
	448	PTR_ERR(dev_priv->backlight));
	449	dev_priv->backlight = NULL;
	450	return -ENODEV;
	451	}
	452	dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
	453	return 0;
	454	}
	455
	456	void intel_panel_destroy_backlight(struct drm_device *dev)
	457	{
	458	struct drm_i915_private *dev_priv = dev->dev_private;
	459	if (dev_priv->backlight)
	460	backlight_device_unregister(dev_priv->backlight);
	461	}
	462	#else
	463	int intel_panel_setup_backlight(struct drm_device *dev)
	464	{
	465	intel_panel_init_backlight(dev);
	466	return 0;
	467	}
	468
	469	void intel_panel_destroy_backlight(struct drm_device *dev)
	470	{
	471	return;
	472	}
	473	#endif