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/*

 * Copyright © 2008 Intel Corporation

 *             2014 Red Hat Inc.

 *

 * 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.

 *

 */

#include 

#include "i915_drv.h"

#include "intel_drv.h"

#include 

#include 

#include 

static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,

					struct intel_crtc_state *pipe_config)

{

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

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);

	struct intel_digital_port *intel_dig_port = intel_mst->primary;

	struct intel_dp *intel_dp = &intel_dig_port->dp;

	struct drm_atomic_state *state;

	int bpp, i;

	int lane_count, slots;

	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;

	struct drm_connector *drm_connector;

	struct intel_connector *connector, *found = NULL;

	struct drm_connector_state *connector_state;

	int mst_pbn;

	pipe_config->dp_encoder_is_mst = true;

	pipe_config->has_pch_encoder = false;

	pipe_config->has_dp_encoder = true;

	bpp = 24;

	/*

	 * for MST we always configure max link bw - the spec doesn't

	 * seem to suggest we should do otherwise.

	 */

	lane_count = drm_dp_max_lane_count(intel_dp->dpcd);

	pipe_config->lane_count = lane_count;

	pipe_config->pipe_bpp = 24;

	pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);

	state = pipe_config->base.state;

	for_each_connector_in_state(state, drm_connector, connector_state, i) {

		connector = to_intel_connector(drm_connector);

		if (connector_state->best_encoder == &encoder->base) {

			found = connector;

			break;

		}

	}

	if (!found) {

		DRM_ERROR("can't find connector\n");

		return false;

	}

	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);

	pipe_config->pbn = mst_pbn;

	slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);

	intel_link_compute_m_n(bpp, lane_count,

			       adjusted_mode->crtc_clock,

			       pipe_config->port_clock,

			       &pipe_config->dp_m_n);

	pipe_config->dp_m_n.tu = slots;

	if (IS_HASWELL(dev) || IS_BROADWELL(dev))

		hsw_dp_set_ddi_pll_sel(pipe_config);

	return true;

}

static void intel_mst_disable_dp(struct intel_encoder *encoder)

{

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);

	struct intel_digital_port *intel_dig_port = intel_mst->primary;

	struct intel_dp *intel_dp = &intel_dig_port->dp;

	int ret;

	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);

	drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);

	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);

	if (ret) {

		DRM_ERROR("failed to update payload %d\n", ret);

	}

}

static void intel_mst_post_disable_dp(struct intel_encoder *encoder)

{

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);

	struct intel_digital_port *intel_dig_port = intel_mst->primary;

	struct intel_dp *intel_dp = &intel_dig_port->dp;

	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);

	/* this can fail */

	drm_dp_check_act_status(&intel_dp->mst_mgr);

	/* and this can also fail */

	drm_dp_update_payload_part2(&intel_dp->mst_mgr);

	drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);

	intel_dp->active_mst_links--;

	intel_mst->port = NULL;

	if (intel_dp->active_mst_links == 0) {

		intel_dig_port->base.post_disable(&intel_dig_port->base);

		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);

	}

}

static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)

{

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);

	struct intel_digital_port *intel_dig_port = intel_mst->primary;

	struct intel_dp *intel_dp = &intel_dig_port->dp;

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

	struct drm_i915_private *dev_priv = dev->dev_private;

	enum port port = intel_dig_port->port;

	int ret;

	uint32_t temp;

	struct intel_connector *found = NULL, *connector;

	int slots;

	struct drm_crtc *crtc = encoder->base.crtc;

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	for_each_intel_connector(dev, connector) {

		if (connector->base.state->best_encoder == &encoder->base) {

			found = connector;

			break;

		}

	}

	if (!found) {

		DRM_ERROR("can't find connector\n");

		return;

	}

	/* MST encoders are bound to a crtc, not to a connector,

	 * force the mapping here for get_hw_state.

	 */

	found->encoder = encoder;

	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);

	intel_mst->port = found->port;

	if (intel_dp->active_mst_links == 0) {

		intel_prepare_ddi_buffer(&intel_dig_port->base);

		intel_ddi_clk_select(&intel_dig_port->base, intel_crtc->config);

		intel_dp_set_link_params(intel_dp, intel_crtc->config);

		intel_ddi_init_dp_buf_reg(&intel_dig_port->base);

		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);

		intel_dp_start_link_train(intel_dp);

		intel_dp_stop_link_train(intel_dp);

	}

	ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,

				       intel_mst->port,

				       intel_crtc->config->pbn, &slots);

	if (ret == false) {

		DRM_ERROR("failed to allocate vcpi\n");

		return;

	}

	intel_dp->active_mst_links++;

	temp = I915_READ(DP_TP_STATUS(port));

	I915_WRITE(DP_TP_STATUS(port), temp);

	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);

}

static void intel_mst_enable_dp(struct intel_encoder *encoder)

{

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);

	struct intel_digital_port *intel_dig_port = intel_mst->primary;

	struct intel_dp *intel_dp = &intel_dig_port->dp;

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

	struct drm_i915_private *dev_priv = dev->dev_private;

	enum port port = intel_dig_port->port;

	int ret;

	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);

	if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),

		     1))

		DRM_ERROR("Timed out waiting for ACT sent\n");

	ret = drm_dp_check_act_status(&intel_dp->mst_mgr);

	ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);

}

static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,

				      enum pipe *pipe)

{

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);

	*pipe = intel_mst->pipe;

	if (intel_mst->port)

		return true;

	return false;

}

static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,

					struct intel_crtc_state *pipe_config)

{

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);

	struct intel_digital_port *intel_dig_port = intel_mst->primary;

	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);

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

	struct drm_i915_private *dev_priv = dev->dev_private;

	enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;

	u32 temp, flags = 0;

	pipe_config->has_dp_encoder = true;

	temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));

	if (temp & TRANS_DDI_PHSYNC)

		flags |= DRM_MODE_FLAG_PHSYNC;

	else

		flags |= DRM_MODE_FLAG_NHSYNC;

	if (temp & TRANS_DDI_PVSYNC)

		flags |= DRM_MODE_FLAG_PVSYNC;

	else

		flags |= DRM_MODE_FLAG_NVSYNC;

	switch (temp & TRANS_DDI_BPC_MASK) {

	case TRANS_DDI_BPC_6:

		pipe_config->pipe_bpp = 18;

		break;

	case TRANS_DDI_BPC_8:

		pipe_config->pipe_bpp = 24;

		break;

	case TRANS_DDI_BPC_10:

		pipe_config->pipe_bpp = 30;

		break;

	case TRANS_DDI_BPC_12:

		pipe_config->pipe_bpp = 36;

		break;

	default:

		break;

	}

	pipe_config->base.adjusted_mode.flags |= flags;

	pipe_config->lane_count =

		((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;

	intel_dp_get_m_n(crtc, pipe_config);

	intel_ddi_clock_get(&intel_dig_port->base, pipe_config);

}

static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct intel_dp *intel_dp = intel_connector->mst_port;

	struct edid *edid;

	int ret;

	edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);

	if (!edid)

		return 0;

	ret = intel_connector_update_modes(connector, edid);

	kfree(edid);

	return ret;

}

static enum drm_connector_status

intel_dp_mst_detect(struct drm_connector *connector, bool force)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct intel_dp *intel_dp = intel_connector->mst_port;

	return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);

}

static int

intel_dp_mst_set_property(struct drm_connector *connector,

			  struct drm_property *property,

			  uint64_t val)

{

	return 0;

}

static void

intel_dp_mst_connector_destroy(struct drm_connector *connector)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	if (!IS_ERR_OR_NULL(intel_connector->edid))

		kfree(intel_connector->edid);

	drm_connector_cleanup(connector);

	kfree(connector);

}

static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {

	.dpms = drm_atomic_helper_connector_dpms,

	.detect = intel_dp_mst_detect,

	.fill_modes = drm_helper_probe_single_connector_modes,

	.set_property = intel_dp_mst_set_property,

	.atomic_get_property = intel_connector_atomic_get_property,

	.destroy = intel_dp_mst_connector_destroy,

	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,

	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,

};

static int intel_dp_mst_get_modes(struct drm_connector *connector)

{

	return intel_dp_mst_get_ddc_modes(connector);

}

static enum drm_mode_status

intel_dp_mst_mode_valid(struct drm_connector *connector,

			struct drm_display_mode *mode)

{

	int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;

	/* TODO - validate mode against available PBN for link */

	if (mode->clock < 10000)

		return MODE_CLOCK_LOW;

	if (mode->flags & DRM_MODE_FLAG_DBLCLK)

		return MODE_H_ILLEGAL;

	if (mode->clock > max_dotclk)

		return MODE_CLOCK_HIGH;

	return MODE_OK;

}

static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,

							 struct drm_connector_state *state)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct intel_dp *intel_dp = intel_connector->mst_port;

	struct intel_crtc *crtc = to_intel_crtc(state->crtc);

	return &intel_dp->mst_encoders[crtc->pipe]->base.base;

}

static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct intel_dp *intel_dp = intel_connector->mst_port;

	return &intel_dp->mst_encoders[0]->base.base;

}

static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {

	.get_modes = intel_dp_mst_get_modes,

	.mode_valid = intel_dp_mst_mode_valid,

	.atomic_best_encoder = intel_mst_atomic_best_encoder,

	.best_encoder = intel_mst_best_encoder,

};

static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)

{

	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);

	drm_encoder_cleanup(encoder);

	kfree(intel_mst);

}

static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {

	.destroy = intel_dp_mst_encoder_destroy,

};

static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)

{

	if (connector->encoder && connector->base.state->crtc) {

		enum pipe pipe;

		if (!connector->encoder->get_hw_state(connector->encoder, &pipe))

			return false;

		return true;

	}

	return false;

}

static void intel_connector_add_to_fbdev(struct intel_connector *connector)

{

#ifdef CONFIG_DRM_FBDEV_EMULATION

	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);

	if (dev_priv->fbdev)

		drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,

						&connector->base);

#endif

}

static void intel_connector_remove_from_fbdev(struct intel_connector *connector)

{

#ifdef CONFIG_DRM_FBDEV_EMULATION

	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);

	if (dev_priv->fbdev)

		drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,

						   &connector->base);

#endif

}

static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *pathprop)

{

	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);

	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);

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

	struct intel_connector *intel_connector;

	struct drm_connector *connector;

	int i;

	intel_connector = intel_connector_alloc();

	if (!intel_connector)

		return NULL;

	connector = &intel_connector->base;

	drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);

	drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);

	intel_connector->unregister = intel_connector_unregister;

	intel_connector->get_hw_state = intel_dp_mst_get_hw_state;

	intel_connector->mst_port = intel_dp;

	intel_connector->port = port;

	for (i = PIPE_A; i <= PIPE_C; i++) {

		drm_mode_connector_attach_encoder(&intel_connector->base,

						  &intel_dp->mst_encoders[i]->base.base);

	}

	intel_dp_add_properties(intel_dp, connector);

	drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);

	drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);

	drm_mode_connector_set_path_property(connector, pathprop);

	return connector;

}

static void intel_dp_register_mst_connector(struct drm_connector *connector)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct drm_device *dev = connector->dev;

	drm_modeset_lock_all(dev);

	intel_connector_add_to_fbdev(intel_connector);

	drm_modeset_unlock_all(dev);

	drm_connector_register(&intel_connector->base);

}

static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,

					   struct drm_connector *connector)

{

	struct intel_connector *intel_connector = to_intel_connector(connector);

	struct drm_device *dev = connector->dev;

	intel_connector->unregister(intel_connector);

	/* need to nuke the connector */

	drm_modeset_lock_all(dev);

	if (connector->state->crtc) {

		struct drm_mode_set set;

		int ret;

		memset(&set, 0, sizeof(set));

		set.crtc = connector->state->crtc,

		ret = drm_atomic_helper_set_config(&set);

		WARN(ret, "Disabling mst crtc failed with %i\n", ret);

	}

	intel_connector_remove_from_fbdev(intel_connector);

	drm_connector_cleanup(connector);

	drm_modeset_unlock_all(dev);

	kfree(intel_connector);

	DRM_DEBUG_KMS("\n");

}

static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)

{

	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);

	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);

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

	drm_kms_helper_hotplug_event(dev);

}

static const struct drm_dp_mst_topology_cbs mst_cbs = {

	.add_connector = intel_dp_add_mst_connector,

	.register_connector = intel_dp_register_mst_connector,

	.destroy_connector = intel_dp_destroy_mst_connector,

	.hotplug = intel_dp_mst_hotplug,

};

static struct intel_dp_mst_encoder *

intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)

{

	struct intel_dp_mst_encoder *intel_mst;

	struct intel_encoder *intel_encoder;

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

	intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);

	if (!intel_mst)

		return NULL;

	intel_mst->pipe = pipe;

	intel_encoder = &intel_mst->base;

	intel_mst->primary = intel_dig_port;

	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,

			 DRM_MODE_ENCODER_DPMST, NULL);

	intel_encoder->type = INTEL_OUTPUT_DP_MST;

	intel_encoder->crtc_mask = 0x7;

	intel_encoder->cloneable = 0;

	intel_encoder->compute_config = intel_dp_mst_compute_config;

	intel_encoder->disable = intel_mst_disable_dp;

	intel_encoder->post_disable = intel_mst_post_disable_dp;

	intel_encoder->pre_enable = intel_mst_pre_enable_dp;

	intel_encoder->enable = intel_mst_enable_dp;

	intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;

	intel_encoder->get_config = intel_dp_mst_enc_get_config;

	return intel_mst;

}

static bool

intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)

{

	int i;

	struct intel_dp *intel_dp = &intel_dig_port->dp;

	for (i = PIPE_A; i <= PIPE_C; i++)

		intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);

	return true;

}

int

intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)

{

	struct intel_dp *intel_dp = &intel_dig_port->dp;

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

	int ret;

	intel_dp->can_mst = true;

	intel_dp->mst_mgr.cbs = &mst_cbs;

	/* create encoders */

	intel_dp_create_fake_mst_encoders(intel_dig_port);

	ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);

	if (ret) {

		intel_dp->can_mst = false;

		return ret;

	}

	return 0;

}

void

intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)

{

	struct intel_dp *intel_dp = &intel_dig_port->dp;

	if (!intel_dp->can_mst)

		return;

	drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);

	/* encoders will get killed by normal cleanup */

}