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/*

 * Copyright © 2006-2010 Intel Corporation

 * Copyright (c) 2006 Dave Airlie 

 *

 * 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 

 *      Dave Airlie 

 *      Jesse Barnes 

 *      Chris Wilson 

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include 

#include "intel_drv.h"

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

void

intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,

		       struct drm_display_mode *adjusted_mode)

{

	drm_mode_copy(adjusted_mode, fixed_mode);

	drm_mode_set_crtcinfo(adjusted_mode, 0);

}

/* adjusted_mode has been preset to be the panel's fixed mode */

void

intel_pch_panel_fitting(struct intel_crtc *intel_crtc,

			struct intel_crtc_config *pipe_config,

			int fitting_mode)

{

	struct drm_display_mode *mode, *adjusted_mode;

	int x, y, width, height;

	mode = &pipe_config->requested_mode;

	adjusted_mode = &pipe_config->adjusted_mode;

	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;

	case DRM_MODE_SCALE_FULLSCREEN:

		x = y = 0;

		width = adjusted_mode->hdisplay;

		height = adjusted_mode->vdisplay;

		break;

	default:

		WARN(1, "bad panel fit mode: %d\n", fitting_mode);

		return;

	}

done:

	pipe_config->pch_pfit.pos = (x << 16) | y;

	pipe_config->pch_pfit.size = (width << 16) | height;

	pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;

}

static void

centre_horizontally(struct drm_display_mode *mode,

		    int width)

{

	u32 border, sync_pos, blank_width, sync_width;

	/* keep the hsync and hblank widths constant */

	sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;

	blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;

	sync_pos = (blank_width - sync_width + 1) / 2;

	border = (mode->hdisplay - width + 1) / 2;

	border += border & 1; /* make the border even */

	mode->crtc_hdisplay = width;

	mode->crtc_hblank_start = width + border;

	mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;

	mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;

	mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;

}

static void

centre_vertically(struct drm_display_mode *mode,

		  int height)

{

	u32 border, sync_pos, blank_width, sync_width;

	/* keep the vsync and vblank widths constant */

	sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;

	blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;

	sync_pos = (blank_width - sync_width + 1) / 2;

	border = (mode->vdisplay - height + 1) / 2;

	mode->crtc_vdisplay = height;

	mode->crtc_vblank_start = height + border;

	mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;

	mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;

	mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;

}

static inline u32 panel_fitter_scaling(u32 source, u32 target)

{

	/*

	 * Floating point operation is not supported. So the FACTOR

	 * is defined, which can avoid the floating point computation

	 * when calculating the panel ratio.

	 */

#define ACCURACY 12

#define FACTOR (1 << ACCURACY)

	u32 ratio = source * FACTOR / target;

	return (FACTOR * ratio + FACTOR/2) / FACTOR;

}

void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,

			      struct intel_crtc_config *pipe_config,

			      int fitting_mode)

{

	struct drm_device *dev = intel_crtc->base.dev;

	u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;

	struct drm_display_mode *mode, *adjusted_mode;

	mode = &pipe_config->requested_mode;

	adjusted_mode = &pipe_config->adjusted_mode;

	/* Native modes don't need fitting */

	if (adjusted_mode->hdisplay == mode->hdisplay &&

	    adjusted_mode->vdisplay == mode->vdisplay)

		goto out;

	switch (fitting_mode) {

	case DRM_MODE_SCALE_CENTER:

		/*

		 * For centered modes, we have to calculate border widths &

		 * heights and modify the values programmed into the CRTC.

		 */

		centre_horizontally(adjusted_mode, mode->hdisplay);

		centre_vertically(adjusted_mode, mode->vdisplay);

		border = LVDS_BORDER_ENABLE;

		break;

	case DRM_MODE_SCALE_ASPECT:

		/* Scale but preserve the aspect ratio */

		if (INTEL_INFO(dev)->gen >= 4) {

			u32 scaled_width = adjusted_mode->hdisplay *

				mode->vdisplay;

			u32 scaled_height = mode->hdisplay *

				adjusted_mode->vdisplay;

			/* 965+ is easy, it does everything in hw */

			if (scaled_width > scaled_height)

				pfit_control |= PFIT_ENABLE |

					PFIT_SCALING_PILLAR;

			else if (scaled_width < scaled_height)

				pfit_control |= PFIT_ENABLE |

					PFIT_SCALING_LETTER;

			else if (adjusted_mode->hdisplay != mode->hdisplay)

				pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;

		} else {

			u32 scaled_width = adjusted_mode->hdisplay *

				mode->vdisplay;

			u32 scaled_height = mode->hdisplay *

				adjusted_mode->vdisplay;

			/*

			 * For earlier chips we have to calculate the scaling

			 * ratio by hand and program it into the

			 * PFIT_PGM_RATIO register

			 */

			if (scaled_width > scaled_height) { /* pillar */

				centre_horizontally(adjusted_mode,

						    scaled_height /

						    mode->vdisplay);

				border = LVDS_BORDER_ENABLE;

				if (mode->vdisplay != adjusted_mode->vdisplay) {

					u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);

					pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |

							    bits << PFIT_VERT_SCALE_SHIFT);

					pfit_control |= (PFIT_ENABLE |

							 VERT_INTERP_BILINEAR |

							 HORIZ_INTERP_BILINEAR);

				}

			} else if (scaled_width < scaled_height) { /* letter */

				centre_vertically(adjusted_mode,

						  scaled_width /

						  mode->hdisplay);

				border = LVDS_BORDER_ENABLE;

				if (mode->hdisplay != adjusted_mode->hdisplay) {

					u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);

					pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |

							    bits << PFIT_VERT_SCALE_SHIFT);

					pfit_control |= (PFIT_ENABLE |

							 VERT_INTERP_BILINEAR |

							 HORIZ_INTERP_BILINEAR);

				}

			} else {

				/* Aspects match, Let hw scale both directions */

				pfit_control |= (PFIT_ENABLE |

						 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |

						 VERT_INTERP_BILINEAR |

						 HORIZ_INTERP_BILINEAR);

			}

		}

		break;

	case DRM_MODE_SCALE_FULLSCREEN:

		/*

		 * Full scaling, even if it changes the aspect ratio.

		 * Fortunately this is all done for us in hw.

		 */

		if (mode->vdisplay != adjusted_mode->vdisplay ||

		    mode->hdisplay != adjusted_mode->hdisplay) {

			pfit_control |= PFIT_ENABLE;

			if (INTEL_INFO(dev)->gen >= 4)

				pfit_control |= PFIT_SCALING_AUTO;

			else

				pfit_control |= (VERT_AUTO_SCALE |

						 VERT_INTERP_BILINEAR |

						 HORIZ_AUTO_SCALE |

						 HORIZ_INTERP_BILINEAR);

		}

		break;

	default:

		WARN(1, "bad panel fit mode: %d\n", fitting_mode);

		return;

	}

	/* 965+ wants fuzzy fitting */

	/* FIXME: handle multiple panels by failing gracefully */

	if (INTEL_INFO(dev)->gen >= 4)

		pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |

				 PFIT_FILTER_FUZZY);

out:

	if ((pfit_control & PFIT_ENABLE) == 0) {

		pfit_control = 0;

		pfit_pgm_ratios = 0;

	}

	/* Make sure pre-965 set dither correctly for 18bpp panels. */

	if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)

		pfit_control |= PANEL_8TO6_DITHER_ENABLE;

	pipe_config->gmch_pfit.control = pfit_control;

	pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;

	pipe_config->gmch_pfit.lvds_border_bits = border;

}

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;

//   WARN_ON_SMP(!spin_is_locked(&dev_priv->backlight.lock));

	/* 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;

	unsigned long flags;

	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

	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);

	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

	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;

	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;

	unsigned long flags;

	/*

	 * Do not disable backlight on the vgaswitcheroo path. When switching

	 * away from i915, the other client may depend on i915 to handle the

	 * backlight. This will leave the backlight on unnecessarily when

	 * another client is not activated.

	 */

	if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {

		DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");

		return;

	}

	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

	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);

		}

	}

	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

}

void intel_panel_enable_backlight(struct drm_device *dev,

				  enum pipe pipe)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	enum transcoder cpu_transcoder =

		intel_pipe_to_cpu_transcoder(dev_priv, pipe);

	unsigned long flags;

	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

	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;

		if (cpu_transcoder == TRANSCODER_EDP)

			tmp |= BLM_TRANSCODER_EDP;

		else

			tmp |= BLM_PIPE(cpu_transcoder);

		tmp &= ~BLM_PWM_ENABLE;

		I915_WRITE(reg, tmp);

		POSTING_READ(reg);

		I915_WRITE(reg, tmp | BLM_PWM_ENABLE);

		if (HAS_PCH_SPLIT(dev) &&

		    !(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {

			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);

	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

}

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;

	unsigned long flags;

	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;

	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

	props.max_brightness = intel_panel_get_max_backlight(dev);

	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

	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);

}