[mirror_ubuntu-focal-kernel.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;
}

/* XXX: query mode clock or hardware clock and program max PWM appropriately
 * when it's 0.
 */
static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	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->regfile.saveBLC_PWM_CTL2 == 0) {
			dev_priv->regfile.saveBLC_PWM_CTL2 = val;
		} else if (val == 0) {
			val = dev_priv->regfile.saveBLC_PWM_CTL2;
			I915_WRITE(BLC_PWM_PCH_CTL2, val);
		}
	} else {
		val = I915_READ(BLC_PWM_CTL);
		if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
			dev_priv->regfile.saveBLC_PWM_CTL = val;
			if (INTEL_INFO(dev)->gen >= 4)
				dev_priv->regfile.saveBLC_PWM_CTL2 =
					I915_READ(BLC_PWM_CTL2);
		} else if (val == 0) {
			val = dev_priv->regfile.saveBLC_PWM_CTL;
			I915_WRITE(BLC_PWM_CTL, val);
			if (INTEL_INFO(dev)->gen >= 4)
				I915_WRITE(BLC_PWM_CTL2,
					   dev_priv->regfile.saveBLC_PWM_CTL2);
		}
	}

	return val;
}

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

	max = i915_read_blc_pwm_ctl(dev);

	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) {
		u32 max = intel_panel_get_max_backlight(dev);
		if (max)
			return max - 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;

		/* we're screwed, but keep behaviour backwards compatible */
		if (!max)
			max = 1;

		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);
}

/* set backlight brightness to level in range [0..max] */
void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 freq;

	freq = intel_panel_get_max_backlight(dev);
	if (!freq) {
		/* we are screwed, bail out */
		return;
	}

	/* scale to hardware */
	level = level * freq / max;

	dev_priv->backlight.level = level;
	if (dev_priv->backlight.device)
		dev_priv->backlight.device->props.brightness = 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 (dev_priv->backlight.device)
			dev_priv->backlight.device->props.brightness =
				dev_priv->backlight.level;
	}

	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 (INTEL_INFO(dev)->num_pipes == 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)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	/* Assume that the BIOS does not lie through the OpRegion... */
	if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
		return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
			connector_status_connected :
			connector_status_disconnected;
	}

	switch (i915_panel_ignore_lid) {
	case -2:
		return connector_status_connected;
	case -1:
		return connector_status_disconnected;
	default:
		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,
				  bd->props.max_brightness);
	return 0;
}

static int intel_panel_get_brightness(struct backlight_device *bd)
{
	struct drm_device *dev = bl_get_data(bd);
	return intel_panel_get_backlight(dev);
}

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_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct backlight_properties props;

	intel_panel_init_backlight(dev);

	if (WARN_ON(dev_priv->backlight.device))
		return -ENODEV;

	memset(&props, 0, sizeof(props));
	props.type = BACKLIGHT_RAW;
	props.brightness = dev_priv->backlight.level;
	props.max_brightness = intel_panel_get_max_backlight(dev);
	if (props.max_brightness == 0) {
		DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
		return -ENODEV;
	}
	dev_priv->backlight.device =
		backlight_device_register("intel_backlight",
					  &connector->kdev, dev,
					  &intel_panel_bl_ops, &props);

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

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

void intel_panel_destroy_backlight(struct drm_device *dev)
{
	return;
}
#endif

int intel_panel_init(struct intel_panel *panel,
		     struct drm_display_mode *fixed_mode)
{
	panel->fixed_mode = fixed_mode;

	return 0;
}

void intel_panel_fini(struct intel_panel *panel)
{
	struct intel_connector *intel_connector =
		container_of(panel, struct intel_connector, panel);

	if (panel->fixed_mode)
		drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
}
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
d6540632 JN	133	/* XXX: query mode clock or hardware clock and program max PWM appropriately
	134	* when it's 0.
	135	*/
bfd7590d	136	static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
0b0b053a	137	{
bfd7590d	138	struct drm_i915_private *dev_priv = dev->dev_private;
0b0b053a CW	139	u32 val;
	140
	141	/* Restore the CTL value if it lost, e.g. GPU reset */
	142
	143	if (HAS_PCH_SPLIT(dev_priv->dev)) {
	144	val = I915_READ(BLC_PWM_PCH_CTL2);
f4c956ad DV	145	if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
f4c956ad DV	146	dev_priv->regfile.saveBLC_PWM_CTL2 = val;
0b0b053a	147	} else if (val == 0) {
f4c956ad	148	val = dev_priv->regfile.saveBLC_PWM_CTL2;
bfd7590d	149	I915_WRITE(BLC_PWM_PCH_CTL2, val);
0b0b053a CW	150	}
	151	} else {
	152	val = I915_READ(BLC_PWM_CTL);
f4c956ad DV	153	if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
f4c956ad DV	154	dev_priv->regfile.saveBLC_PWM_CTL = val;
bfd7590d JN	155	if (INTEL_INFO(dev)->gen >= 4)
	156	dev_priv->regfile.saveBLC_PWM_CTL2 =
	157	I915_READ(BLC_PWM_CTL2);
0b0b053a	158	} else if (val == 0) {
f4c956ad	159	val = dev_priv->regfile.saveBLC_PWM_CTL;
bfd7590d JN	160	I915_WRITE(BLC_PWM_CTL, val);
	161	if (INTEL_INFO(dev)->gen >= 4)
	162	I915_WRITE(BLC_PWM_CTL2,
	163	dev_priv->regfile.saveBLC_PWM_CTL2);
0b0b053a CW	164	}
	165	}
	166
	167	return val;
	168	}
	169
d6540632	170	static u32 intel_panel_get_max_backlight(struct drm_device *dev)
a9573556	171	{
a9573556 CW	172	u32 max;
a9573556 CW	173
bfd7590d	174	max = i915_read_blc_pwm_ctl(dev);
0b0b053a	175
a9573556	176	if (HAS_PCH_SPLIT(dev)) {
0b0b053a	177	max >>= 16;
a9573556	178	} else {
ca88479c	179	if (INTEL_INFO(dev)->gen < 4)
a9573556	180	max >>= 17;
ca88479c	181	else
a9573556	182	max >>= 16;
ba3820ad TI	183
	184	if (is_backlight_combination_mode(dev))
	185	max *= 0xff;
a9573556 CW	186	}
a9573556 CW	187
a9573556	188	DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
d6540632	189
a9573556 CW	190	return max;
	191	}
	192
4dca20ef CE	193	static int i915_panel_invert_brightness;
	194	MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
	195	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
7bd90909 CE	196	"report PCI device ID, subsystem vendor and subsystem device ID "
	197	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
	198	"It will then be included in an upcoming module version.");
4dca20ef	199	module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
7bd90909 CE	200	static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
7bd90909 CE	201	{
4dca20ef CE	202	struct drm_i915_private *dev_priv = dev->dev_private;
	203
	204	if (i915_panel_invert_brightness < 0)
	205	return val;
	206
	207	if (i915_panel_invert_brightness > 0 \|\|
d6540632 JN	208	dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
	209	u32 max = intel_panel_get_max_backlight(dev);
	210	if (max)
	211	return max - val;
	212	}
7bd90909 CE	213
	214	return val;
	215	}
	216
faea35dd	217	static u32 intel_panel_get_backlight(struct drm_device *dev)
a9573556 CW	218	{
	219	struct drm_i915_private *dev_priv = dev->dev_private;
	220	u32 val;
	221
	222	if (HAS_PCH_SPLIT(dev)) {
	223	val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
	224	} else {
	225	val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
ca88479c	226	if (INTEL_INFO(dev)->gen < 4)
a9573556	227	val >>= 1;
ba3820ad	228
0206e353	229	if (is_backlight_combination_mode(dev)) {
ba3820ad TI	230	u8 lbpc;
ba3820ad TI	231
ba3820ad TI	232	pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
	233	val *= lbpc;
	234	}
a9573556 CW	235	}
a9573556 CW	236
7bd90909	237	val = intel_panel_compute_brightness(dev, val);
a9573556 CW	238	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
	239	return val;
	240	}
	241
	242	static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
	243	{
	244	struct drm_i915_private *dev_priv = dev->dev_private;
	245	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
	246	I915_WRITE(BLC_PWM_CPU_CTL, val \| level);
	247	}
	248
f52c619a	249	static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
a9573556 CW	250	{
	251	struct drm_i915_private *dev_priv = dev->dev_private;
	252	u32 tmp;
	253
	254	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
7bd90909	255	level = intel_panel_compute_brightness(dev, level);
a9573556 CW	256
	257	if (HAS_PCH_SPLIT(dev))
	258	return intel_pch_panel_set_backlight(dev, level);
ba3820ad	259
0206e353	260	if (is_backlight_combination_mode(dev)) {
ba3820ad TI	261	u32 max = intel_panel_get_max_backlight(dev);
	262	u8 lbpc;
	263
d6540632 JN	264	/* we're screwed, but keep behaviour backwards compatible */
	265	if (!max)
	266	max = 1;
	267
ba3820ad TI	268	lbpc = level * 0xfe / max + 1;
	269	level /= lbpc;
	270	pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
	271	}
	272
a9573556	273	tmp = I915_READ(BLC_PWM_CTL);
a726915c	274	if (INTEL_INFO(dev)->gen < 4)
a9573556	275	level <<= 1;
ca88479c	276	tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
a9573556 CW	277	I915_WRITE(BLC_PWM_CTL, tmp \| level);
a9573556 CW	278	}
47356eb6	279
d6540632 JN	280	/* set backlight brightness to level in range [0..max] */
d6540632 JN	281	void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max)
47356eb6 CW	282	{
47356eb6 CW	283	struct drm_i915_private *dev_priv = dev->dev_private;
d6540632 JN	284	u32 freq;
	285
	286	freq = intel_panel_get_max_backlight(dev);
	287	if (!freq) {
	288	/* we are screwed, bail out */
	289	return;
	290	}
	291
	292	/* scale to hardware */
	293	level = level * freq / max;
47356eb6	294
31ad8ec6 JN	295	dev_priv->backlight.level = level;
	296	if (dev_priv->backlight.device)
	297	dev_priv->backlight.device->props.brightness = level;
b6b3ba5b	298
31ad8ec6	299	if (dev_priv->backlight.enabled)
f52c619a TI	300	intel_panel_actually_set_backlight(dev, level);
	301	}
	302
	303	void intel_panel_disable_backlight(struct drm_device *dev)
	304	{
	305	struct drm_i915_private *dev_priv = dev->dev_private;
47356eb6	306
31ad8ec6	307	dev_priv->backlight.enabled = false;
f52c619a	308	intel_panel_actually_set_backlight(dev, 0);
24ded204 DV	309
24ded204 DV	310	if (INTEL_INFO(dev)->gen >= 4) {
a4f32fc3	311	uint32_t reg, tmp;
24ded204 DV	312
	313	reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
	314
	315	I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
a4f32fc3 PZ	316
	317	if (HAS_PCH_SPLIT(dev)) {
	318	tmp = I915_READ(BLC_PWM_PCH_CTL1);
	319	tmp &= ~BLM_PCH_PWM_ENABLE;
	320	I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
	321	}
24ded204	322	}
47356eb6 CW	323	}
47356eb6 CW	324
24ded204 DV	325	void intel_panel_enable_backlight(struct drm_device *dev,
24ded204 DV	326	enum pipe pipe)
47356eb6 CW	327	{
	328	struct drm_i915_private *dev_priv = dev->dev_private;
	329
31ad8ec6 JN	330	if (dev_priv->backlight.level == 0) {
	331	dev_priv->backlight.level = intel_panel_get_max_backlight(dev);
	332	if (dev_priv->backlight.device)
	333	dev_priv->backlight.device->props.brightness =
	334	dev_priv->backlight.level;
b6b3ba5b	335	}
47356eb6	336
24ded204 DV	337	if (INTEL_INFO(dev)->gen >= 4) {
	338	uint32_t reg, tmp;
	339
	340	reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
	341
	342
	343	tmp = I915_READ(reg);
	344
	345	/* Note that this can also get called through dpms changes. And
	346	* we don't track the backlight dpms state, hence check whether
	347	* we have to do anything first. */
	348	if (tmp & BLM_PWM_ENABLE)
770c1231	349	goto set_level;
24ded204	350
7eb552ae	351	if (INTEL_INFO(dev)->num_pipes == 3)
24ded204 DV	352	tmp &= ~BLM_PIPE_SELECT_IVB;
	353	else
	354	tmp &= ~BLM_PIPE_SELECT;
	355
	356	tmp \|= BLM_PIPE(pipe);
	357	tmp &= ~BLM_PWM_ENABLE;
	358
	359	I915_WRITE(reg, tmp);
	360	POSTING_READ(reg);
	361	I915_WRITE(reg, tmp \| BLM_PWM_ENABLE);
a4f32fc3 PZ	362
	363	if (HAS_PCH_SPLIT(dev)) {
	364	tmp = I915_READ(BLC_PWM_PCH_CTL1);
	365	tmp \|= BLM_PCH_PWM_ENABLE;
	366	tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
	367	I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
	368	}
24ded204	369	}
770c1231 TI	370
770c1231 TI	371	set_level:
b1289371 DV	372	/* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
	373	* BLC_PWM_CPU_CTL may be cleared to zero automatically when these
	374	* registers are set.
770c1231	375	*/
ecb135a1 DV	376	dev_priv->backlight.enabled = true;
ecb135a1 DV	377	intel_panel_actually_set_backlight(dev, dev_priv->backlight.level);
47356eb6 CW	378	}
47356eb6 CW	379
aaa6fd2a	380	static void intel_panel_init_backlight(struct drm_device *dev)
47356eb6 CW	381	{
	382	struct drm_i915_private *dev_priv = dev->dev_private;
	383
31ad8ec6 JN	384	dev_priv->backlight.level = intel_panel_get_backlight(dev);
31ad8ec6 JN	385	dev_priv->backlight.enabled = dev_priv->backlight.level != 0;
47356eb6	386	}
fe16d949 CW	387
	388	enum drm_connector_status
	389	intel_panel_detect(struct drm_device *dev)
	390	{
	391	struct drm_i915_private *dev_priv = dev->dev_private;
	392
	393	/* Assume that the BIOS does not lie through the OpRegion... */
a726915c	394	if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
fe16d949 CW	395	return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
	396	connector_status_connected :
	397	connector_status_disconnected;
a726915c	398	}
fe16d949	399
a726915c DV	400	switch (i915_panel_ignore_lid) {
	401	case -2:
	402	return connector_status_connected;
	403	case -1:
	404	return connector_status_disconnected;
	405	default:
	406	return connector_status_unknown;
	407	}
fe16d949	408	}
aaa6fd2a MG	409
	410	#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
	411	static int intel_panel_update_status(struct backlight_device *bd)
	412	{
	413	struct drm_device *dev = bl_get_data(bd);
d6540632 JN	414	intel_panel_set_backlight(dev, bd->props.brightness,
d6540632 JN	415	bd->props.max_brightness);
aaa6fd2a MG	416	return 0;
	417	}
	418
	419	static int intel_panel_get_brightness(struct backlight_device *bd)
	420	{
	421	struct drm_device *dev = bl_get_data(bd);
7c23396b	422	return intel_panel_get_backlight(dev);
aaa6fd2a MG	423	}
	424
	425	static const struct backlight_ops intel_panel_bl_ops = {
	426	.update_status = intel_panel_update_status,
	427	.get_brightness = intel_panel_get_brightness,
	428	};
	429
0657b6b1	430	int intel_panel_setup_backlight(struct drm_connector *connector)
aaa6fd2a	431	{
0657b6b1	432	struct drm_device *dev = connector->dev;
aaa6fd2a MG	433	struct drm_i915_private *dev_priv = dev->dev_private;
aaa6fd2a MG	434	struct backlight_properties props;
aaa6fd2a MG	435
	436	intel_panel_init_backlight(dev);
	437
dc652f90 JN	438	if (WARN_ON(dev_priv->backlight.device))
	439	return -ENODEV;
	440
af437cfd	441	memset(&props, 0, sizeof(props));
aaa6fd2a	442	props.type = BACKLIGHT_RAW;
31ad8ec6	443	props.brightness = dev_priv->backlight.level;
d6540632	444	props.max_brightness = intel_panel_get_max_backlight(dev);
28dcc2d6	445	if (props.max_brightness == 0) {
e86b6185	446	DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
28dcc2d6 JN	447	return -ENODEV;
28dcc2d6 JN	448	}
31ad8ec6	449	dev_priv->backlight.device =
aaa6fd2a MG	450	backlight_device_register("intel_backlight",
	451	&connector->kdev, dev,
	452	&intel_panel_bl_ops, &props);
	453
31ad8ec6	454	if (IS_ERR(dev_priv->backlight.device)) {
aaa6fd2a	455	DRM_ERROR("Failed to register backlight: %ld\n",
31ad8ec6 JN	456	PTR_ERR(dev_priv->backlight.device));
31ad8ec6 JN	457	dev_priv->backlight.device = NULL;
aaa6fd2a MG	458	return -ENODEV;
aaa6fd2a MG	459	}
aaa6fd2a MG	460	return 0;
	461	}
	462
	463	void intel_panel_destroy_backlight(struct drm_device *dev)
	464	{
	465	struct drm_i915_private *dev_priv = dev->dev_private;
dc652f90	466	if (dev_priv->backlight.device) {
31ad8ec6	467	backlight_device_unregister(dev_priv->backlight.device);
dc652f90 JN	468	dev_priv->backlight.device = NULL;
dc652f90 JN	469	}
aaa6fd2a MG	470	}
aaa6fd2a MG	471	#else
0657b6b1	472	int intel_panel_setup_backlight(struct drm_connector *connector)
aaa6fd2a	473	{
0657b6b1	474	intel_panel_init_backlight(connector->dev);
aaa6fd2a MG	475	return 0;
	476	}
	477
	478	void intel_panel_destroy_backlight(struct drm_device *dev)
	479	{
	480	return;
	481	}
	482	#endif
1d508706	483
dd06f90e JN	484	int intel_panel_init(struct intel_panel *panel,
dd06f90e JN	485	struct drm_display_mode *fixed_mode)
1d508706	486	{
dd06f90e JN	487	panel->fixed_mode = fixed_mode;
dd06f90e JN	488
1d508706 JN	489	return 0;
	490	}
	491
	492	void intel_panel_fini(struct intel_panel *panel)
	493	{
dd06f90e JN	494	struct intel_connector *intel_connector =
	495	container_of(panel, struct intel_connector, panel);
	496
	497	if (panel->fixed_mode)
	498	drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1d508706	499	}