[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_dp_mst.c

/*
 * 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 <drm/drmP.h>
#include "i915_drv.h"
#include "intel_drv.h"
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>

static bool intel_dp_mst_compute_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_dp *intel_dp = &intel_dig_port->dp;
	struct drm_device *dev = encoder->base.dev;
	int bpp;
	int lane_count, slots;
	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
	struct intel_connector *found = NULL, *intel_connector;
	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);
	intel_dp->link_bw = intel_dp_max_link_bw(intel_dp);
	intel_dp->lane_count = lane_count;

	pipe_config->pipe_bpp = 24;
	pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);

	list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
		if (intel_connector->new_encoder == encoder) {
			found = intel_connector;
			break;
		}
	}

	if (!found) {
		DRM_ERROR("can't find connector\n");
		return false;
	}

	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->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;
	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, *intel_connector;
	int slots;
	struct drm_crtc *crtc = encoder->base.crtc;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
		if (intel_connector->new_encoder == encoder) {
			found = intel_connector;
			break;
		}
	}

	if (!found) {
		DRM_ERROR("can't find connector\n");
		return;
	}

	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
	intel_mst->port = found->port;

	if (intel_dp->active_mst_links == 0) {
		enum port port = intel_ddi_get_encoder_port(encoder);

		I915_WRITE(PORT_CLK_SEL(port),
			   intel_crtc->config->ddi_pll_sel);

		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_complete_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 = crtc->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;
	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 = intel_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,
};

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)
{
	/* 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;

	return MODE_OK;
}

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,
	.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) {
		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_I915_FBDEV
	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
	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_I915_FBDEV
	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
	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 = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
	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);
	drm_reinit_primary_mode_group(dev);
	mutex_lock(&dev->mode_config.mutex);
	intel_connector_add_to_fbdev(intel_connector);
	mutex_unlock(&dev->mode_config.mutex);
	drm_connector_register(&intel_connector->base);
	return connector;
}

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;
	/* need to nuke the connector */
	mutex_lock(&dev->mode_config.mutex);
	intel_connector_dpms(connector, DRM_MODE_DPMS_OFF);
	mutex_unlock(&dev->mode_config.mutex);

	intel_connector->unregister(intel_connector);

	mutex_lock(&dev->mode_config.mutex);
	intel_connector_remove_from_fbdev(intel_connector);
	drm_connector_cleanup(connector);
	mutex_unlock(&dev->mode_config.mutex);

	drm_reinit_primary_mode_group(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 struct drm_dp_mst_topology_cbs mst_cbs = {
	.add_connector = intel_dp_add_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);

	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 */
}
Commit	Line	Data
0e32b39c DA	1	/*
	2	* Copyright © 2008 Intel Corporation
	3	* 2014 Red Hat Inc.
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the "Software"),
	7	* to deal in the Software without restriction, including without limitation
	8	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	9	* and/or sell copies of the Software, and to permit persons to whom the
	10	* Software is furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice (including the next
	13	* paragraph) shall be included in all copies or substantial portions of the
	14	* Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	21	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	22	* IN THE SOFTWARE.
	23	*
	24	*/
	25
	26	#include <drm/drmP.h>
	27	#include "i915_drv.h"
	28	#include "intel_drv.h"
c6f95f27	29	#include <drm/drm_atomic_helper.h>
0e32b39c DA	30	#include <drm/drm_crtc_helper.h>
	31	#include <drm/drm_edid.h>
	32
	33	static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
5cec258b	34	struct intel_crtc_state *pipe_config)
0e32b39c DA	35	{
	36	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
	37	struct intel_digital_port *intel_dig_port = intel_mst->primary;
	38	struct intel_dp *intel_dp = &intel_dig_port->dp;
	39	struct drm_device *dev = encoder->base.dev;
	40	int bpp;
	41	int lane_count, slots;
2d112de7	42	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
0e32b39c DA	43	struct intel_connector found = NULL, intel_connector;
	44	int mst_pbn;
	45
	46	pipe_config->dp_encoder_is_mst = true;
	47	pipe_config->has_pch_encoder = false;
	48	pipe_config->has_dp_encoder = true;
	49	bpp = 24;
	50	/*
	51	* for MST we always configure max link bw - the spec doesn't
	52	* seem to suggest we should do otherwise.
	53	*/
	54	lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
	55	intel_dp->link_bw = intel_dp_max_link_bw(intel_dp);
	56	intel_dp->lane_count = lane_count;
	57
	58	pipe_config->pipe_bpp = 24;
	59	pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
	60
	61	list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
	62	if (intel_connector->new_encoder == encoder) {
	63	found = intel_connector;
	64	break;
	65	}
	66	}
	67
	68	if (!found) {
	69	DRM_ERROR("can't find connector\n");
	70	return false;
	71	}
	72
	73	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp);
	74
	75	pipe_config->pbn = mst_pbn;
	76	slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
	77
	78	intel_link_compute_m_n(bpp, lane_count,
	79	adjusted_mode->crtc_clock,
	80	pipe_config->port_clock,
	81	&pipe_config->dp_m_n);
	82
	83	pipe_config->dp_m_n.tu = slots;
	84	return true;
	85
	86	}
	87
	88	static void intel_mst_disable_dp(struct intel_encoder *encoder)
	89	{
	90	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
	91	struct intel_digital_port *intel_dig_port = intel_mst->primary;
	92	struct intel_dp *intel_dp = &intel_dig_port->dp;
	93	int ret;
	94
	95	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
	96
	97	drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
	98
	99	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
	100	if (ret) {
	101	DRM_ERROR("failed to update payload %d\n", ret);
	102	}
	103	}
	104
	105	static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
	106	{
107	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
108	struct intel_digital_port *intel_dig_port = intel_mst->primary;
109	struct intel_dp *intel_dp = &intel_dig_port->dp;
110
111	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
112
113	/* this can fail */
114	drm_dp_check_act_status(&intel_dp->mst_mgr);
115	/* and this can also fail */
116	drm_dp_update_payload_part2(&intel_dp->mst_mgr);
117
118	drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
119
120	intel_dp->active_mst_links--;
121	intel_mst->port = NULL;
122	if (intel_dp->active_mst_links == 0) {
123	intel_dig_port->base.post_disable(&intel_dig_port->base);
124	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
125	}
126	}
127
128	static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
129	{
130	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
131	struct intel_digital_port *intel_dig_port = intel_mst->primary;
132	struct intel_dp *intel_dp = &intel_dig_port->dp;
133	struct drm_device *dev = encoder->base.dev;
134	struct drm_i915_private *dev_priv = dev->dev_private;
135	enum port port = intel_dig_port->port;
136	int ret;
137	uint32_t temp;
138	struct intel_connector found = NULL, intel_connector;
139	int slots;
140	struct drm_crtc *crtc = encoder->base.crtc;
141	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
142
143	list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
144	if (intel_connector->new_encoder == encoder) {
145	found = intel_connector;
146	break;
147	}
148	}
149
150	if (!found) {
151	DRM_ERROR("can't find connector\n");
152	return;
153	}
154
155	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
156	intel_mst->port = found->port;
157
158	if (intel_dp->active_mst_links == 0) {
159	enum port port = intel_ddi_get_encoder_port(encoder);
160
6e3c9717 ACO	161	I915_WRITE(PORT_CLK_SEL(port),
6e3c9717 ACO	162	intel_crtc->config->ddi_pll_sel);
0e32b39c DA	163
	164	intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
	165
	166	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
	167
	168
	169	intel_dp_start_link_train(intel_dp);
	170	intel_dp_complete_link_train(intel_dp);
	171	intel_dp_stop_link_train(intel_dp);
	172	}
	173
	174	ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
6e3c9717 ACO	175	intel_mst->port,
6e3c9717 ACO	176	intel_crtc->config->pbn, &slots);
0e32b39c DA	177	if (ret == false) {
	178	DRM_ERROR("failed to allocate vcpi\n");
	179	return;
	180	}
	181
	182
	183	intel_dp->active_mst_links++;
	184	temp = I915_READ(DP_TP_STATUS(port));
	185	I915_WRITE(DP_TP_STATUS(port), temp);
	186
	187	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
	188	}
	189
	190	static void intel_mst_enable_dp(struct intel_encoder *encoder)
	191	{
	192	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
	193	struct intel_digital_port *intel_dig_port = intel_mst->primary;
	194	struct intel_dp *intel_dp = &intel_dig_port->dp;
	195	struct drm_device *dev = intel_dig_port->base.base.dev;
	196	struct drm_i915_private *dev_priv = dev->dev_private;
	197	enum port port = intel_dig_port->port;
	198	int ret;
	199
	200	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
	201
	202	if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
	203	1))
	204	DRM_ERROR("Timed out waiting for ACT sent\n");
	205
	206	ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
	207
	208	ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
	209	}
	210
	211	static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
	212	enum pipe *pipe)
	213	{
	214	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
	215	*pipe = intel_mst->pipe;
	216	if (intel_mst->port)
	217	return true;
	218	return false;
	219	}
	220
	221	static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
5cec258b	222	struct intel_crtc_state *pipe_config)
0e32b39c DA	223	{
	224	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
	225	struct intel_digital_port *intel_dig_port = intel_mst->primary;
	226	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	227	struct drm_device *dev = encoder->base.dev;
	228	struct drm_i915_private *dev_priv = dev->dev_private;
6e3c9717	229	enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;
0e32b39c DA	230	u32 temp, flags = 0;
	231
	232	pipe_config->has_dp_encoder = true;
	233
	234	temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
	235	if (temp & TRANS_DDI_PHSYNC)
	236	flags \|= DRM_MODE_FLAG_PHSYNC;
	237	else
	238	flags \|= DRM_MODE_FLAG_NHSYNC;
	239	if (temp & TRANS_DDI_PVSYNC)
	240	flags \|= DRM_MODE_FLAG_PVSYNC;
	241	else
	242	flags \|= DRM_MODE_FLAG_NVSYNC;
	243
	244	switch (temp & TRANS_DDI_BPC_MASK) {
	245	case TRANS_DDI_BPC_6:
	246	pipe_config->pipe_bpp = 18;
	247	break;
	248	case TRANS_DDI_BPC_8:
	249	pipe_config->pipe_bpp = 24;
	250	break;
	251	case TRANS_DDI_BPC_10:
	252	pipe_config->pipe_bpp = 30;
	253	break;
	254	case TRANS_DDI_BPC_12:
	255	pipe_config->pipe_bpp = 36;
	256	break;
	257	default:
	258	break;
	259	}
2d112de7	260	pipe_config->base.adjusted_mode.flags \|= flags;
0e32b39c DA	261	intel_dp_get_m_n(crtc, pipe_config);
	262
	263	intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
	264	}
	265
	266	static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
	267	{
	268	struct intel_connector *intel_connector = to_intel_connector(connector);
	269	struct intel_dp *intel_dp = intel_connector->mst_port;
	270	struct edid *edid;
	271	int ret;
	272
	273	edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
	274	if (!edid)
	275	return 0;
	276
	277	ret = intel_connector_update_modes(connector, edid);
	278	kfree(edid);
	279
	280	return ret;
	281	}
	282
	283	static enum drm_connector_status
f7f3d48a	284	intel_dp_mst_detect(struct drm_connector *connector, bool force)
0e32b39c DA	285	{
	286	struct intel_connector *intel_connector = to_intel_connector(connector);
	287	struct intel_dp *intel_dp = intel_connector->mst_port;
	288
c6a0aed4	289	return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
0e32b39c DA	290	}
0e32b39c DA	291
0e32b39c DA	292	static int
	293	intel_dp_mst_set_property(struct drm_connector *connector,
	294	struct drm_property *property,
	295	uint64_t val)
	296	{
	297	return 0;
	298	}
	299
	300	static void
	301	intel_dp_mst_connector_destroy(struct drm_connector *connector)
	302	{
	303	struct intel_connector *intel_connector = to_intel_connector(connector);
	304
	305	if (!IS_ERR_OR_NULL(intel_connector->edid))
	306	kfree(intel_connector->edid);
	307
	308	drm_connector_cleanup(connector);
	309	kfree(connector);
	310	}
	311
	312	static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
	313	.dpms = intel_connector_dpms,
	314	.detect = intel_dp_mst_detect,
	315	.fill_modes = drm_helper_probe_single_connector_modes,
	316	.set_property = intel_dp_mst_set_property,
2545e4a6	317	.atomic_get_property = intel_connector_atomic_get_property,
0e32b39c	318	.destroy = intel_dp_mst_connector_destroy,
c6f95f27	319	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0e32b39c DA	320	};
	321
	322	static int intel_dp_mst_get_modes(struct drm_connector *connector)
	323	{
	324	return intel_dp_mst_get_ddc_modes(connector);
	325	}
	326
	327	static enum drm_mode_status
	328	intel_dp_mst_mode_valid(struct drm_connector *connector,
	329	struct drm_display_mode *mode)
	330	{
	331	/* TODO - validate mode against available PBN for link */
	332	if (mode->clock < 10000)
	333	return MODE_CLOCK_LOW;
	334
	335	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
	336	return MODE_H_ILLEGAL;
	337
	338	return MODE_OK;
	339	}
	340
	341	static struct drm_encoder intel_mst_best_encoder(struct drm_connector connector)
	342	{
	343	struct intel_connector *intel_connector = to_intel_connector(connector);
	344	struct intel_dp *intel_dp = intel_connector->mst_port;
	345	return &intel_dp->mst_encoders[0]->base.base;
	346	}
	347
	348	static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
	349	.get_modes = intel_dp_mst_get_modes,
	350	.mode_valid = intel_dp_mst_mode_valid,
	351	.best_encoder = intel_mst_best_encoder,
	352	};
	353
	354	static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
	355	{
	356	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
	357
	358	drm_encoder_cleanup(encoder);
	359	kfree(intel_mst);
	360	}
	361
	362	static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
	363	.destroy = intel_dp_mst_encoder_destroy,
	364	};
	365
	366	static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
	367	{
	368	if (connector->encoder) {
	369	enum pipe pipe;
	370	if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
	371	return false;
	372	return true;
	373	}
	374	return false;
	375	}
	376
7296c849 CW	377	static void intel_connector_add_to_fbdev(struct intel_connector *connector)
	378	{
	379	#ifdef CONFIG_DRM_I915_FBDEV
	380	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
	381	drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
	382	#endif
	383	}
	384
	385	static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
	386	{
	387	#ifdef CONFIG_DRM_I915_FBDEV
	388	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
	389	drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
	390	#endif
	391	}
	392
12e6cecd	393	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)
0e32b39c DA	394	{
	395	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
	396	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	397	struct drm_device *dev = intel_dig_port->base.base.dev;
0e32b39c DA	398	struct intel_connector *intel_connector;
	399	struct drm_connector *connector;
	400	int i;
	401
	402	intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
	403	if (!intel_connector)
	404	return NULL;
	405
	406	connector = &intel_connector->base;
	407	drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
	408	drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
	409
	410	intel_connector->unregister = intel_connector_unregister;
	411	intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
	412	intel_connector->mst_port = intel_dp;
	413	intel_connector->port = port;
	414
	415	for (i = PIPE_A; i <= PIPE_C; i++) {
	416	drm_mode_connector_attach_encoder(&intel_connector->base,
	417	&intel_dp->mst_encoders[i]->base.base);
	418	}
	419	intel_dp_add_properties(intel_dp, connector);
	420
	421	drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
6f134d7b DA	422	drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
6f134d7b DA	423
0e32b39c DA	424	drm_mode_connector_set_path_property(connector, pathprop);
	425	drm_reinit_primary_mode_group(dev);
	426	mutex_lock(&dev->mode_config.mutex);
7296c849	427	intel_connector_add_to_fbdev(intel_connector);
0e32b39c DA	428	mutex_unlock(&dev->mode_config.mutex);
	429	drm_connector_register(&intel_connector->base);
	430	return connector;
	431	}
	432
	433	static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
	434	struct drm_connector *connector)
	435	{
	436	struct intel_connector *intel_connector = to_intel_connector(connector);
	437	struct drm_device *dev = connector->dev;
0e32b39c DA	438	/* need to nuke the connector */
	439	mutex_lock(&dev->mode_config.mutex);
	440	intel_connector_dpms(connector, DRM_MODE_DPMS_OFF);
	441	mutex_unlock(&dev->mode_config.mutex);
	442
	443	intel_connector->unregister(intel_connector);
	444
	445	mutex_lock(&dev->mode_config.mutex);
7296c849	446	intel_connector_remove_from_fbdev(intel_connector);
0e32b39c DA	447	drm_connector_cleanup(connector);
	448	mutex_unlock(&dev->mode_config.mutex);
	449
	450	drm_reinit_primary_mode_group(dev);
	451
	452	kfree(intel_connector);
	453	DRM_DEBUG_KMS("\n");
	454	}
	455
	456	static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
	457	{
	458	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
	459	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
	460	struct drm_device *dev = intel_dig_port->base.base.dev;
	461
	462	drm_kms_helper_hotplug_event(dev);
	463	}
	464
	465	static struct drm_dp_mst_topology_cbs mst_cbs = {
	466	.add_connector = intel_dp_add_mst_connector,
	467	.destroy_connector = intel_dp_destroy_mst_connector,
	468	.hotplug = intel_dp_mst_hotplug,
	469	};
	470
	471	static struct intel_dp_mst_encoder *
	472	intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
	473	{
	474	struct intel_dp_mst_encoder *intel_mst;
	475	struct intel_encoder *intel_encoder;
	476	struct drm_device *dev = intel_dig_port->base.base.dev;
	477
	478	intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
	479
	480	if (!intel_mst)
	481	return NULL;
	482
	483	intel_mst->pipe = pipe;
	484	intel_encoder = &intel_mst->base;
	485	intel_mst->primary = intel_dig_port;
	486
	487	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
	488	DRM_MODE_ENCODER_DPMST);
	489
	490	intel_encoder->type = INTEL_OUTPUT_DP_MST;
	491	intel_encoder->crtc_mask = 0x7;
	492	intel_encoder->cloneable = 0;
	493
	494	intel_encoder->compute_config = intel_dp_mst_compute_config;
	495	intel_encoder->disable = intel_mst_disable_dp;
	496	intel_encoder->post_disable = intel_mst_post_disable_dp;
	497	intel_encoder->pre_enable = intel_mst_pre_enable_dp;
	498	intel_encoder->enable = intel_mst_enable_dp;
	499	intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
	500	intel_encoder->get_config = intel_dp_mst_enc_get_config;
	501
	502	return intel_mst;
	503
	504	}
	505
	506	static bool
	507	intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
	508	{
	509	int i;
	510	struct intel_dp *intel_dp = &intel_dig_port->dp;
511
512	for (i = PIPE_A; i <= PIPE_C; i++)
513	intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
514	return true;
515	}
516
517	int
518	intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
519	{
520	struct intel_dp *intel_dp = &intel_dig_port->dp;
521	struct drm_device *dev = intel_dig_port->base.base.dev;
522	int ret;
523
524	intel_dp->can_mst = true;
525	intel_dp->mst_mgr.cbs = &mst_cbs;
526
527	/* create encoders */
528	intel_dp_create_fake_mst_encoders(intel_dig_port);
529	ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
530	if (ret) {
531	intel_dp->can_mst = false;
532	return ret;
533	}
534	return 0;
535	}
536
537	void
538	intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
539	{
540	struct intel_dp *intel_dp = &intel_dig_port->dp;
541
542	if (!intel_dp->can_mst)
543	return;
544
545	drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
546	/* encoders will get killed by normal cleanup */
547	}