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

/* Private structure for the integrated LVDS support */
struct intel_lvds_connector {
	struct intel_connector base;

	struct notifier_block lid_notifier;
};

struct intel_lvds_encoder {
	struct intel_encoder base;

	bool is_dual_link;
	u32 reg;

	struct intel_lvds_connector *attached_connector;
};

static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
{
	return container_of(encoder, struct intel_lvds_encoder, base.base);
}

static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
{
	return container_of(connector, struct intel_lvds_connector, base.base);
}

static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
				    enum pipe *pipe)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
	u32 tmp;

	tmp = I915_READ(lvds_encoder->reg);

	if (!(tmp & LVDS_PORT_EN))
		return false;

	if (HAS_PCH_CPT(dev))
		*pipe = PORT_TO_PIPE_CPT(tmp);
	else
		*pipe = PORT_TO_PIPE(tmp);

	return true;
}

static void intel_lvds_get_config(struct intel_encoder *encoder,
				  struct intel_crtc_config *pipe_config)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 lvds_reg, tmp, flags = 0;
	int dotclock;

	if (HAS_PCH_SPLIT(dev))
		lvds_reg = PCH_LVDS;
	else
		lvds_reg = LVDS;

	tmp = I915_READ(lvds_reg);
	if (tmp & LVDS_HSYNC_POLARITY)
		flags |= DRM_MODE_FLAG_NHSYNC;
	else
		flags |= DRM_MODE_FLAG_PHSYNC;
	if (tmp & LVDS_VSYNC_POLARITY)
		flags |= DRM_MODE_FLAG_NVSYNC;
	else
		flags |= DRM_MODE_FLAG_PVSYNC;

	pipe_config->adjusted_mode.flags |= flags;

	/* gen2/3 store dither state in pfit control, needs to match */
	if (INTEL_INFO(dev)->gen < 4) {
		tmp = I915_READ(PFIT_CONTROL);

		pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
	}

	dotclock = pipe_config->port_clock;

	if (HAS_PCH_SPLIT(dev_priv->dev))
		ironlake_check_encoder_dotclock(pipe_config, dotclock);

	pipe_config->adjusted_mode.crtc_clock =