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"
 29#include <drm/drm_atomic_helper.h>
 30#include <drm/drm_crtc_helper.h>
 31#include <drm/drm_edid.h>
 32
 33static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 34					struct intel_crtc_state *pipe_config,
 35					struct drm_connector_state *conn_state)
 36{
 37	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 38	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 39	struct intel_digital_port *intel_dig_port = intel_mst->primary;
 40	struct intel_dp *intel_dp = &intel_dig_port->dp;
 41	struct intel_connector *connector =
 42		to_intel_connector(conn_state->connector);
 43	struct drm_atomic_state *state = pipe_config->base.state;
 44	int bpp;
 45	int lane_count, slots;
 46	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 47	int mst_pbn;
 48	bool reduce_m_n = drm_dp_has_quirk(&intel_dp->desc,
 49					   DP_DPCD_QUIRK_LIMITED_M_N);
 50
 51	pipe_config->has_pch_encoder = false;
 52	bpp = 24;
 53	if (intel_dp->compliance.test_data.bpc) {
 54		bpp = intel_dp->compliance.test_data.bpc * 3;
 55		DRM_DEBUG_KMS("Setting pipe bpp to %d\n",
 56			      bpp);
 57	}
 58	/*
 59	 * for MST we always configure max link bw - the spec doesn't
 60	 * seem to suggest we should do otherwise.
 61	 */
 62	lane_count = intel_dp_max_lane_count(intel_dp);
 63
 64	pipe_config->lane_count = lane_count;
 65
 66	pipe_config->pipe_bpp = bpp;
 67
 68	pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
 69
 70	if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
 71		pipe_config->has_audio = true;
 72
 73	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
 74	pipe_config->pbn = mst_pbn;
 75
 76	slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
 77					      connector->port, mst_pbn);
 78	if (slots < 0) {
 79		DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
 80		return false;
 81	}
 82
 83	intel_link_compute_m_n(bpp, lane_count,
 84			       adjusted_mode->crtc_clock,
 85			       pipe_config->port_clock,
 86			       &pipe_config->dp_m_n,
 87			       reduce_m_n);
 88
 89	pipe_config->dp_m_n.tu = slots;
 90
 91	if (IS_GEN9_LP(dev_priv))
 92		pipe_config->lane_lat_optim_mask =
 93			bxt_ddi_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
 94
 95	intel_ddi_compute_min_voltage_level(dev_priv, pipe_config);
 96
 97	return true;
 98}
 99
100static int intel_dp_mst_atomic_check(struct drm_connector *connector,
101		struct drm_connector_state *new_conn_state)
102{
103	struct drm_atomic_state *state = new_conn_state->state;
104	struct drm_connector_state *old_conn_state;
105	struct drm_crtc *old_crtc;
106	struct drm_crtc_state *crtc_state;
107	int slots, ret = 0;
108
109	old_conn_state = drm_atomic_get_old_connector_state(state, connector);
110	old_crtc = old_conn_state->crtc;
111	if (!old_crtc)
112		return ret;
113
114	crtc_state = drm_atomic_get_new_crtc_state(state, old_crtc);
115	slots = to_intel_crtc_state(crtc_state)->dp_m_n.tu;
116	if (drm_atomic_crtc_needs_modeset(crtc_state) && slots > 0) {
117		struct drm_dp_mst_topology_mgr *mgr;
118		struct drm_encoder *old_encoder;
119
120		old_encoder = old_conn_state->best_encoder;
121		mgr = &enc_to_mst(old_encoder)->primary->dp.mst_mgr;
122
123		ret = drm_dp_atomic_release_vcpi_slots(state, mgr, slots);
124		if (ret)
125			DRM_DEBUG_KMS("failed releasing %d vcpi slots:%d\n", slots, ret);
126		else
127			to_intel_crtc_state(crtc_state)->dp_m_n.tu = 0;
128	}
129	return ret;
130}
131
132static void intel_mst_disable_dp(struct intel_encoder *encoder,
133				 const struct intel_crtc_state *old_crtc_state,
134				 const struct drm_connector_state *old_conn_state)
135{
136	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
137	struct intel_digital_port *intel_dig_port = intel_mst->primary;
138	struct intel_dp *intel_dp = &intel_dig_port->dp;
139	struct intel_connector *connector =
140		to_intel_connector(old_conn_state->connector);
141	int ret;
142
143	DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
144
145	drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
146
147	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
148	if (ret) {
149		DRM_ERROR("failed to update payload %d\n", ret);
150	}
151	if (old_crtc_state->has_audio)
152		intel_audio_codec_disable(encoder,
153					  old_crtc_state, old_conn_state);
154}
155
156static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
157				      const struct intel_crtc_state *old_crtc_state,
158				      const struct drm_connector_state *old_conn_state)
159{
160	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
161	struct intel_digital_port *intel_dig_port = intel_mst->primary;
162	struct intel_dp *intel_dp = &intel_dig_port->dp;
163	struct intel_connector *connector =
164		to_intel_connector(old_conn_state->connector);
165
166	/* this can fail */
167	drm_dp_check_act_status(&intel_dp->mst_mgr);
168	/* and this can also fail */
169	drm_dp_update_payload_part2(&intel_dp->mst_mgr);
170
171	drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
172
173	/*
174	 * Power down mst path before disabling the port, otherwise we end
175	 * up getting interrupts from the sink upon detecting link loss.
176	 */
177	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
178				     false);
179
180	intel_dp->active_mst_links--;
181
182	intel_mst->connector = NULL;
183	if (intel_dp->active_mst_links == 0)
184		intel_dig_port->base.post_disable(&intel_dig_port->base,
185						  old_crtc_state, NULL);
186
187	DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
188}
189
190static void intel_mst_pre_pll_enable_dp(struct intel_encoder *encoder,
191					const struct intel_crtc_state *pipe_config,
192					const struct drm_connector_state *conn_state)
193{
194	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
195	struct intel_digital_port *intel_dig_port = intel_mst->primary;
196	struct intel_dp *intel_dp = &intel_dig_port->dp;
197
198	if (intel_dp->active_mst_links == 0 &&
199	    intel_dig_port->base.pre_pll_enable)
200		intel_dig_port->base.pre_pll_enable(&intel_dig_port->base,
201						    pipe_config, NULL);
202}
203
204static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
205				    const struct intel_crtc_state *pipe_config,
206				    const struct drm_connector_state *conn_state)
207{
208	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
209	struct intel_digital_port *intel_dig_port = intel_mst->primary;
210	struct intel_dp *intel_dp = &intel_dig_port->dp;
211	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
212	enum port port = intel_dig_port->base.port;
213	struct intel_connector *connector =
214		to_intel_connector(conn_state->connector);
215	int ret;
216	uint32_t temp;
217
218	/* MST encoders are bound to a crtc, not to a connector,
219	 * force the mapping here for get_hw_state.
220	 */
221	connector->encoder = encoder;
222	intel_mst->connector = connector;
223
224	DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
225
226	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
227	if (intel_dp->active_mst_links == 0)
228		intel_dig_port->base.pre_enable(&intel_dig_port->base,
229						pipe_config, NULL);
230
231	ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
232				       connector->port,
233				       pipe_config->pbn,
234				       pipe_config->dp_m_n.tu);
235	if (ret == false) {
236		DRM_ERROR("failed to allocate vcpi\n");
237		return;
238	}
239
240
241	intel_dp->active_mst_links++;
242	temp = I915_READ(DP_TP_STATUS(port));
243	I915_WRITE(DP_TP_STATUS(port), temp);
244
245	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
246}
247
248static void intel_mst_enable_dp(struct intel_encoder *encoder,
249				const struct intel_crtc_state *pipe_config,
250				const struct drm_connector_state *conn_state)
251{
252	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
253	struct intel_digital_port *intel_dig_port = intel_mst->primary;
254	struct intel_dp *intel_dp = &intel_dig_port->dp;
255	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
256	enum port port = intel_dig_port->base.port;
257	int ret;
258
259	DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
260
261	if (intel_wait_for_register(dev_priv,
262				    DP_TP_STATUS(port),
263				    DP_TP_STATUS_ACT_SENT,
264				    DP_TP_STATUS_ACT_SENT,
265				    1))
266		DRM_ERROR("Timed out waiting for ACT sent\n");
267
268	ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
269
270	ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
271	if (pipe_config->has_audio)
272		intel_audio_codec_enable(encoder, pipe_config, conn_state);
273}
274
275static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
276				      enum pipe *pipe)
277{
278	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
279	*pipe = intel_mst->pipe;
280	if (intel_mst->connector)
281		return true;
282	return false;
283}
284
285static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
286					struct intel_crtc_state *pipe_config)
287{
288	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
289	struct intel_digital_port *intel_dig_port = intel_mst->primary;
290
291	intel_ddi_get_config(&intel_dig_port->base, pipe_config);
292}
293
294static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
295{
296	struct intel_connector *intel_connector = to_intel_connector(connector);
297	struct intel_dp *intel_dp = intel_connector->mst_port;
298	struct edid *edid;
299	int ret;
300
301	if (!intel_dp) {
302		return intel_connector_update_modes(connector, NULL);
303	}
304
305	edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
306	ret = intel_connector_update_modes(connector, edid);
307	kfree(edid);
308
309	return ret;
310}
311
312static enum drm_connector_status
313intel_dp_mst_detect(struct drm_connector *connector, bool force)
314{
315	struct intel_connector *intel_connector = to_intel_connector(connector);
316	struct intel_dp *intel_dp = intel_connector->mst_port;
317
318	if (!intel_dp)
319		return connector_status_disconnected;
320	return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
321}
322
323static void
324intel_dp_mst_connector_destroy(struct drm_connector *connector)
325{
326	struct intel_connector *intel_connector = to_intel_connector(connector);
327
328	if (!IS_ERR_OR_NULL(intel_connector->edid))
329		kfree(intel_connector->edid);
330
331	drm_connector_cleanup(connector);
332	kfree(connector);
333}
334
335static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
336	.detect = intel_dp_mst_detect,
337	.fill_modes = drm_helper_probe_single_connector_modes,
338	.late_register = intel_connector_register,
339	.early_unregister = intel_connector_unregister,
340	.destroy = intel_dp_mst_connector_destroy,
341	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
342	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
343};
344
345static int intel_dp_mst_get_modes(struct drm_connector *connector)
346{
347	return intel_dp_mst_get_ddc_modes(connector);
348}
349
350static enum drm_mode_status
351intel_dp_mst_mode_valid(struct drm_connector *connector,
352			struct drm_display_mode *mode)
353{
354	struct intel_connector *intel_connector = to_intel_connector(connector);
355	struct intel_dp *intel_dp = intel_connector->mst_port;
356	int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
357	int bpp = 24; /* MST uses fixed bpp */
358	int max_rate, mode_rate, max_lanes, max_link_clock;
359
360	if (!intel_dp)
361		return MODE_ERROR;
362
363	max_link_clock = intel_dp_max_link_rate(intel_dp);
364	max_lanes = intel_dp_max_lane_count(intel_dp);
365
366	max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
367	mode_rate = intel_dp_link_required(mode->clock, bpp);
368
369	/* TODO - validate mode against available PBN for link */
370	if (mode->clock < 10000)
371		return MODE_CLOCK_LOW;
372
373	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
374		return MODE_H_ILLEGAL;
375
376	if (mode_rate > max_rate || mode->clock > max_dotclk)
377		return MODE_CLOCK_HIGH;
378
379	return MODE_OK;
380}
381
382static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
383							 struct drm_connector_state *state)
384{
385	struct intel_connector *intel_connector = to_intel_connector(connector);
386	struct intel_dp *intel_dp = intel_connector->mst_port;
387	struct intel_crtc *crtc = to_intel_crtc(state->crtc);
388
389	if (!intel_dp)
390		return NULL;
391	return &intel_dp->mst_encoders[crtc->pipe]->base.base;
392}
393
394static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
395{
396	struct intel_connector *intel_connector = to_intel_connector(connector);
397	struct intel_dp *intel_dp = intel_connector->mst_port;
398	if (!intel_dp)
399		return NULL;
400	return &intel_dp->mst_encoders[0]->base.base;
401}
402
403static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
404	.get_modes = intel_dp_mst_get_modes,
405	.mode_valid = intel_dp_mst_mode_valid,
406	.atomic_best_encoder = intel_mst_atomic_best_encoder,
407	.best_encoder = intel_mst_best_encoder,
408	.atomic_check = intel_dp_mst_atomic_check,
409};
410
411static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
412{
413	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
414
415	drm_encoder_cleanup(encoder);
416	kfree(intel_mst);
417}
418
419static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
420	.destroy = intel_dp_mst_encoder_destroy,
421};
422
423static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
424{
425	if (connector->encoder && connector->base.state->crtc) {
426		enum pipe pipe;
427		if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
428			return false;
429		return true;
430	}
431	return false;
432}
433
434static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *pathprop)
435{
436	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
437	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
438	struct drm_device *dev = intel_dig_port->base.base.dev;
439	struct drm_i915_private *dev_priv = to_i915(dev);
440	struct intel_connector *intel_connector;
441	struct drm_connector *connector;
442	enum pipe pipe;
443	int ret;
444
445	intel_connector = intel_connector_alloc();
446	if (!intel_connector)
447		return NULL;
448
449	connector = &intel_connector->base;
450	ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
451				 DRM_MODE_CONNECTOR_DisplayPort);
452	if (ret) {
453		intel_connector_free(intel_connector);
454		return NULL;
455	}
456
457	drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
458
459	intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
460	intel_connector->mst_port = intel_dp;
461	intel_connector->port = port;
462
463	for_each_pipe(dev_priv, pipe) {
464		struct drm_encoder *enc =
465			&intel_dp->mst_encoders[pipe]->base.base;
466
467		ret = drm_mode_connector_attach_encoder(&intel_connector->base,
468							enc);
469		if (ret)
470			goto err;
471	}
472
473	drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
474	drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
475
476	ret = drm_mode_connector_set_path_property(connector, pathprop);
477	if (ret)
478		goto err;
479
480	return connector;
481
482err:
483	drm_connector_cleanup(connector);
484	return NULL;
485}
486
487static void intel_dp_register_mst_connector(struct drm_connector *connector)
488{
489	struct drm_i915_private *dev_priv = to_i915(connector->dev);
490
491	if (dev_priv->fbdev)
492		drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
493						connector);
494
495	drm_connector_register(connector);
496}
497
498static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
499					   struct drm_connector *connector)
500{
501	struct intel_connector *intel_connector = to_intel_connector(connector);
502	struct drm_i915_private *dev_priv = to_i915(connector->dev);
503
504	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name);
505	drm_connector_unregister(connector);
506
507	if (dev_priv->fbdev)
508		drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
509						   connector);
510	/* prevent race with the check in ->detect */
511	drm_modeset_lock(&connector->dev->mode_config.connection_mutex, NULL);
512	intel_connector->mst_port = NULL;
513	drm_modeset_unlock(&connector->dev->mode_config.connection_mutex);
514
515	drm_connector_unreference(connector);
516}
517
518static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
519{
520	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
521	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
522	struct drm_device *dev = intel_dig_port->base.base.dev;
523
524	drm_kms_helper_hotplug_event(dev);
525}
526
527static const struct drm_dp_mst_topology_cbs mst_cbs = {
528	.add_connector = intel_dp_add_mst_connector,
529	.register_connector = intel_dp_register_mst_connector,
530	.destroy_connector = intel_dp_destroy_mst_connector,
531	.hotplug = intel_dp_mst_hotplug,
532};
533
534static struct intel_dp_mst_encoder *
535intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
536{
537	struct intel_dp_mst_encoder *intel_mst;
538	struct intel_encoder *intel_encoder;
539	struct drm_device *dev = intel_dig_port->base.base.dev;
540
541	intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
542
543	if (!intel_mst)
544		return NULL;
545
546	intel_mst->pipe = pipe;
547	intel_encoder = &intel_mst->base;
548	intel_mst->primary = intel_dig_port;
549
550	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
551			 DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
552
553	intel_encoder->type = INTEL_OUTPUT_DP_MST;
554	intel_encoder->power_domain = intel_dig_port->base.power_domain;
555	intel_encoder->port = intel_dig_port->base.port;
556	intel_encoder->crtc_mask = 0x7;
557	intel_encoder->cloneable = 0;
558
559	intel_encoder->compute_config = intel_dp_mst_compute_config;
560	intel_encoder->disable = intel_mst_disable_dp;
561	intel_encoder->post_disable = intel_mst_post_disable_dp;
562	intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
563	intel_encoder->pre_enable = intel_mst_pre_enable_dp;
564	intel_encoder->enable = intel_mst_enable_dp;
565	intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
566	intel_encoder->get_config = intel_dp_mst_enc_get_config;
567
568	return intel_mst;
569
570}
571
572static bool
573intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
574{
575	struct intel_dp *intel_dp = &intel_dig_port->dp;
576	struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
577	enum pipe pipe;
578
579	for_each_pipe(dev_priv, pipe)
580		intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(intel_dig_port, pipe);
581	return true;
582}
583
584int
585intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
586{
587	struct intel_dp *intel_dp = &intel_dig_port->dp;
588	struct drm_device *dev = intel_dig_port->base.base.dev;
589	int ret;
590
591	intel_dp->can_mst = true;
592	intel_dp->mst_mgr.cbs = &mst_cbs;
593
594	/* create encoders */
595	intel_dp_create_fake_mst_encoders(intel_dig_port);
596	ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev,
597					   &intel_dp->aux, 16, 3, conn_base_id);
598	if (ret) {
599		intel_dp->can_mst = false;
600		return ret;
601	}
602	return 0;
603}
604
605void
606intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
607{
608	struct intel_dp *intel_dp = &intel_dig_port->dp;
609
610	if (!intel_dp->can_mst)
611		return;
612
613	drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
614	/* encoders will get killed by normal cleanup */
615}