path: root/drivers/gpu/drm/i915/display/intel_crt.c

/*
 * Copyright © 2006-2007 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>
 */

#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/slab.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_probe_helper.h>

#include "i915_drv.h"
#include "intel_connector.h"
#include "intel_crt.h"
#include "intel_crtc.h"
#include "intel_ddi.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_fdi.h"
#include "intel_fifo_underrun.h"
#include "intel_gmbus.h"
#include "intel_hotplug.h"

/* Here's the desired hotplug mode */
#define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 |		\
			   ADPA_CRT_HOTPLUG_WARMUP_10MS |		\
			   ADPA_CRT_HOTPLUG_SAMPLE_4S |			\
			   ADPA_CRT_HOTPLUG_VOLTAGE_50 |		\
			   ADPA_CRT_HOTPLUG_VOLREF_325MV |		\
			   ADPA_CRT_HOTPLUG_ENABLE)

struct intel_crt {
	struct intel_encoder base;
	/* DPMS state is stored in the connector, which we need in the
	 * encoder's enable/disable callbacks */
	struct intel_connector *connector;
	bool force_hotplug_required;
	i915_reg_t adpa_reg;
};

static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
{
	return container_of(encoder, struct intel_crt, base);
}

static struct intel_crt *intel_attached_crt(struct intel_connector *connector)
{
	return intel_encoder_to_crt(intel_attached_encoder(connector));
}

bool intel_crt_port_enabled(struct drm_i915_private *dev_priv,
			    i915_reg_t adpa_reg, enum pipe *pipe)
{
	u32 val;

	val = intel_de_read(dev_priv, adpa_reg);

	/* asserts want to know the pipe even if the port is disabled */
	if (HAS_PCH_CPT(dev_priv))
		*pipe = (val & ADPA_PIPE_SEL_MASK_CPT) >> ADPA_PIPE_SEL_SHIFT_CPT;
	else
		*pipe = (val & ADPA_PIPE_SEL_MASK) >> ADPA_PIPE_SEL_SHIFT;

	return val & ADPA_DAC_ENABLE;
}

static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
				   enum pipe *pipe)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	struct intel_crt *crt = intel_encoder_to_crt(encoder);
	intel_wakeref_t wakeref;
	bool ret;

	wakeref = intel_display_power_get_if_enabled(dev_priv,
						     encoder->power_domain);
	if (!wakeref)
		return false;

	ret = intel_crt_port_enabled(dev_priv, crt->adpa_reg, pipe);

	intel_display_power_put(dev_priv, encoder->power_domain, wakeref);

	return ret;
}

static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	struct intel_crt *crt = intel_encoder_to_crt(encoder);
	u32 tmp, flags = 0;

	tmp = intel_de_read(dev_priv, crt->adpa_reg);

	if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
		flags |= DRM_MODE_FLAG_PHSYNC;
	else
		flags |= DRM_MODE_FLAG_NHSYNC;

	if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
		flags |= DRM_MODE_FLAG_PVSYNC;
	else
		flags |= DRM_MODE_FLAG_NVSYNC;

	return flags;
}

static void intel_crt_get_config(struct intel_encoder *encoder,
				 struct intel_crtc_state *pipe_config)
{
	pipe_config->output_types |= BIT(INTEL_OUTPUT_ANALOG);

	pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);

	pipe_config->hw.adjusted_mode.crtc_clock = pipe_config->port_clock;
}

static void hsw_crt_get_config(struct intel_encoder *encoder,
			       struct intel_crtc_state *pipe_config)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);

	hsw_ddi_get_config(encoder, pipe_config);

	pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
					      DRM_MODE_FLAG_NHSYNC |
					      DRM_MODE_FLAG_PVSYNC |
					      DRM_MODE_FLAG_NVSYNC);
	pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);

	pipe_config->hw.adjusted_mode.crtc_clock = lpt_get_iclkip(dev_priv);
}

/* Note: The caller is required to filter out dpms modes not supported by the
 * platform. */
static void intel_crt_set_dpms(struct intel_encoder *encoder,
			       const struct intel_crtc_state *crtc_state,
			       int mode)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);</