path: root/drivers/gpu/drm/i915/intel_lvds.c

/*
 * Copyright © 2006-2007 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>
 */

#include <acpi/button.h>
#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "drm_edid.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include <linux/acpi.h>

/* Private structure for the integrated LVDS support */
struct intel_lvds {
	struct intel_encoder base;

	struct edid *edid;

	int fitting_mode;
	u32 pfit_control;
	u32 pfit_pgm_ratios;
	bool pfit_dirty;

	struct drm_display_mode *fixed_mode;
};

static struct intel_lvds *to_intel_lvds(struct drm_encoder *encoder)
{
	return container_of(encoder, struct intel_lvds, base.base);
}

static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
{
	return container_of(intel_attached_encoder(connector),
			    struct intel_lvds, base);
}

/**
 * Sets the power state for the panel.
 */
static void intel_lvds_enable(struct intel_lvds *intel_lvds)
{
	struct drm_device *dev = intel_lvds->base.base.dev;
	struct intel_crtc *intel_crtc = to_intel_crtc(intel_lvds->base.base.crtc);
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 ctl_reg, lvds_reg, stat_reg;

	if (HAS_PCH_SPLIT(dev)) {
		ctl_reg = PCH_PP_CONTROL;
		lvds_reg = PCH_LVDS;
		stat_reg = PCH_PP_STATUS;
	} else {
		ctl_reg = PP_CONTROL;
		lvds_reg = LVDS;
		stat_reg = PP_STATUS;
	}

	I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);

	if (intel_lvds->pfit_dirty) {
		/*
		 * Enable automatic panel scaling so that non-native modes
		 * fill the screen.  The panel fitter should only be
		 * adjusted whilst the pipe is disabled, according to
		 * register description and PRM.
		 */
		DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
			      intel_lvds->pfit_control,
			      intel_lvds->pfit_pgm_ratios);

		I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
		I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
		intel_lvds->pfit_dirty = false;
	}

	I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
	POSTING_READ(lvds_reg);
	if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
		DRM_ERROR("timed out waiting for panel to power on\n");

	intel_panel_enable_backlight(dev, intel_crtc->pipe);
}

static void intel_lvds_disable(struct intel_lvds *intel_lvds)
{
	struct drm_device *dev = intel_lvds->base.base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 ctl_reg, lvds_reg, stat_reg;

	if (HAS_PCH_SPLIT(dev)) {
		ctl_reg = PCH_PP_CONTROL;
		lvds_reg = PCH_LVDS;
		stat_reg = PCH_PP_STATUS;
	} else {
		ctl_reg = PP_CONTROL;
		lvds_reg = LVDS;
		stat_reg = PP_STATUS;
	}

	intel_panel_disable_backlight(dev);

	I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
	if (wait_for((I915_READ(stat_reg) & PP_ON) == 0,