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

/*
 * Copyright 2006 Dave Airlie <airlied@linux.ie>
 * Copyright © 2006-2009 Intel Corporation
 *
 * 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>
 *	Jesse Barnes <jesse.barnes@intel.com>
 */

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.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"

static struct drm_device *intel_hdmi_to_dev(struct intel_hdmi *intel_hdmi)
{
	return hdmi_to_dig_port(intel_hdmi)->base.base.dev;
}

static void
assert_hdmi_port_disabled(struct intel_hdmi *intel_hdmi)
{
	struct drm_device *dev = intel_hdmi_to_dev(intel_hdmi);
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t enabled_bits;

	enabled_bits = HAS_DDI(dev) ? DDI_BUF_CTL_ENABLE : SDVO_ENABLE;

	WARN(I915_READ(intel_hdmi->sdvox_reg) & enabled_bits,
	     "HDMI port enabled, expecting disabled\n");
}

struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder)
{
	struct intel_digital_port *intel_dig_port =
		container_of(encoder, struct intel_digital_port, base.base);
	return &intel_dig_port->hdmi;
}

static struct intel_hdmi *intel_attached_hdmi(struct drm_connector *connector)
{
	return enc_to_intel_hdmi(&intel_attached_encoder(connector)->base);
}

void intel_dip_infoframe_csum(struct dip_infoframe *frame)
{
	uint8_t *data = (uint8_t *)frame;
	uint8_t sum = 0;
	unsigned i;

	frame->checksum = 0;
	frame->ecc = 0;

	for (i = 0; i < frame->len + DIP_HEADER_SIZE; i++)
		sum += data[i];

	frame->checksum = 0x100 - sum;
}

static u32 g4x_infoframe_index(struct dip_infoframe *frame)
{
	switch (frame->type) {
	case DIP_TYPE_AVI:
		return VIDEO_DIP_SELECT_AVI;
	case DIP_TYPE_SPD:
		return VIDEO_DIP_SELECT_SPD;
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", frame->type);
		return 0;
	}
}

static u32 g4x_infoframe_enable(struct dip_infoframe *frame)
{
	switch (frame->type) {
	case DIP_TYPE_AVI:
		return VIDEO_DIP_ENABLE_AVI;
	case DIP_TYPE_SPD:
		return VIDEO_DIP_ENABLE_SPD;
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", frame->type);
		return 0;
	}
}

static u32 hsw_infoframe_enable(struct dip_infoframe *frame)
{
	switch (frame->type) {
	case DIP_TYPE_AVI:
		return VIDEO_DIP_ENABLE_AVI_HSW;
	case DIP_TYPE_SPD:
		return VIDEO_DIP_ENABLE_SPD_HSW;
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", frame->type);
		return 0;
	}
}

static u32 hsw_infoframe_data_reg(struct dip_infoframe *frame, enum pipe pipe)
{
	switch (frame->type) {
	case DIP_TYPE_AVI:
		return HSW_TVIDEO_DIP_AVI_DATA(pipe);
	case DIP_TYPE_SPD:
		return HSW_TVIDEO_DIP_SPD_DATA(pipe);
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", frame->type);
		return 0;
	}
}

static void