drivers/gpu/drm/i915/intel_dp_mst.c

   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
  33 static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
  34                                         struct intel_crtc_state *pipe_config)
  35 {
  36         struct drm_device *dev = encoder->base.dev;
  37         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  38         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  39         struct intel_dp *intel_dp = &intel_dig_port->dp;
  40         struct drm_atomic_state *state;
  41         int bpp, i;
  42         int lane_count, slots, rate;
  43         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  44         struct drm_connector *drm_connector;
  45         struct intel_connector *connector, *found = NULL;
  46         struct drm_connector_state *connector_state;
  47         int mst_pbn;
  48
  49         pipe_config->dp_encoder_is_mst = true;
  50         pipe_config->has_pch_encoder = false;
  51         pipe_config->has_dp_encoder = true;
  52         bpp = 24;
  53         /*
  54          * for MST we always configure max link bw - the spec doesn't
  55          * seem to suggest we should do otherwise.
  56          */
  57         lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
  58
  59         rate = intel_dp_max_link_rate(intel_dp);
  60
  61         if (intel_dp->num_sink_rates) {
  62                 intel_dp->link_bw = 0;
  63                 intel_dp->rate_select = intel_dp_rate_select(intel_dp, rate);
  64         } else {
  65                 intel_dp->link_bw = drm_dp_link_rate_to_bw_code(rate);
  66                 intel_dp->rate_select = 0;
  67         }
  68
  69         intel_dp->lane_count = lane_count;
  70
  71         pipe_config->pipe_bpp = 24;
  72         pipe_config->port_clock = rate;
  73
  74         state = pipe_config->base.state;
  75
  76         for_each_connector_in_state(state, drm_connector, connector_state, i) {
  77                 connector = to_intel_connector(drm_connector);
  78
  79                 if (connector_state->best_encoder == &encoder->base) {
  80                         found = connector;
  81                         break;
  82                 }
  83         }
  84
  85         if (!found) {
  86                 DRM_ERROR("can't find connector\n");
  87                 return false;
  88         }
  89
  90         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp);
  91
  92         pipe_config->pbn = mst_pbn;
  93         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  94
  95         intel_link_compute_m_n(bpp, lane_count,
  96                                adjusted_mode->crtc_clock,
  97                                pipe_config->port_clock,
  98                                &pipe_config->dp_m_n);
  99
 100         pipe_config->dp_m_n.tu = slots;
 101
 102         if (IS_HASWELL(dev) || IS_BROADWELL(dev))
 103                 hsw_dp_set_ddi_pll_sel(pipe_config);
 104
 105         return true;
 106
 107 }
 108
 109 static void intel_mst_disable_dp(struct intel_encoder *encoder)
 110 {
 111         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 112         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 113         struct intel_dp *intel_dp = &intel_dig_port->dp;
 114         int ret;
 115
 116         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 117
 118         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
 119
 120         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 121         if (ret) {
 122                 DRM_ERROR("failed to update payload %d\n", ret);
 123         }
 124 }
 125
 126 static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
 127 {
 128         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 129         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 130         struct intel_dp *intel_dp = &intel_dig_port->dp;
 131
 132         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 133
 134         /* this can fail */
 135         drm_dp_check_act_status(&intel_dp->mst_mgr);
 136         /* and this can also fail */
 137         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 138
 139         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
 140
 141         intel_dp->active_mst_links--;
 142         intel_mst->port = NULL;
 143         if (intel_dp->active_mst_links == 0) {
 144                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 145                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 146         }
 147 }
 148
 149 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 150 {
 151         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 152         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 153         struct intel_dp *intel_dp = &intel_dig_port->dp;
 154         struct drm_device *dev = encoder->base.dev;
 155         struct drm_i915_private *dev_priv = dev->dev_private;
 156         enum port port = intel_dig_port->port;
 157         int ret;
 158         uint32_t temp;
 159         struct intel_connector *found = NULL, *connector;
 160         int slots;
 161         struct drm_crtc *crtc = encoder->base.crtc;
 162         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 163
 164         for_each_intel_connector(dev, connector) {
 165                 if (connector->base.state->best_encoder == &encoder->base) {
 166                         found = connector;
 167                         break;
 168                 }
 169         }
 170
 171         if (!found) {
 172                 DRM_ERROR("can't find connector\n");
 173                 return;
 174         }
 175
 176         /* MST encoders are bound to a crtc, not to a connector,
 177          * force the mapping here for get_hw_state.
 178          */
 179         found->encoder = encoder;
 180
 181         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 182         intel_mst->port = found->port;
 183
 184         if (intel_dp->active_mst_links == 0) {
 185                 enum port port = intel_ddi_get_encoder_port(encoder);
 186
 187                 /* FIXME: add support for SKL */
 188                 if (INTEL_INFO(dev)->gen < 9)
 189                         I915_WRITE(PORT_CLK_SEL(port),
 190                                    intel_crtc->config->ddi_pll_sel);
 191
 192                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 193
 194                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 195
 196
 197                 intel_dp_start_link_train(intel_dp);
 198                 intel_dp_complete_link_train(intel_dp);
 199                 intel_dp_stop_link_train(intel_dp);
 200         }
 201
 202         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 203                                        intel_mst->port,
 204                                        intel_crtc->config->pbn, &slots);
 205         if (ret == false) {
 206                 DRM_ERROR("failed to allocate vcpi\n");
 207                 return;
 208         }
 209
 210
 211         intel_dp->active_mst_links++;
 212         temp = I915_READ(DP_TP_STATUS(port));
 213         I915_WRITE(DP_TP_STATUS(port), temp);
 214
 215         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 216 }
 217
 218 static void intel_mst_enable_dp(struct intel_encoder *encoder)
 219 {
 220         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 221         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 222         struct intel_dp *intel_dp = &intel_dig_port->dp;
 223         struct drm_device *dev = intel_dig_port->base.base.dev;
 224         struct drm_i915_private *dev_priv = dev->dev_private;
 225         enum port port = intel_dig_port->port;
 226         int ret;
 227
 228         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 229
 230         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
 231                      1))
 232                 DRM_ERROR("Timed out waiting for ACT sent\n");
 233
 234         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 235
 236         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 237 }
 238
 239 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 240                                       enum pipe *pipe)
 241 {
 242         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 243         *pipe = intel_mst->pipe;
 244         if (intel_mst->port)
 245                 return true;
 246         return false;
 247 }
 248
 249 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 250                                         struct intel_crtc_state *pipe_config)
 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_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 255         struct drm_device *dev = encoder->base.dev;
 256         struct drm_i915_private *dev_priv = dev->dev_private;
 257         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 258         u32 temp, flags = 0;
 259
 260         pipe_config->has_dp_encoder = true;
 261
 262         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 263         if (temp & TRANS_DDI_PHSYNC)
 264                 flags |= DRM_MODE_FLAG_PHSYNC;
 265         else
 266                 flags |= DRM_MODE_FLAG_NHSYNC;
 267         if (temp & TRANS_DDI_PVSYNC)
 268                 flags |= DRM_MODE_FLAG_PVSYNC;
 269         else
 270                 flags |= DRM_MODE_FLAG_NVSYNC;
 271
 272         switch (temp & TRANS_DDI_BPC_MASK) {
 273         case TRANS_DDI_BPC_6:
 274                 pipe_config->pipe_bpp = 18;
 275                 break;
 276         case TRANS_DDI_BPC_8:
 277                 pipe_config->pipe_bpp = 24;
 278                 break;
 279         case TRANS_DDI_BPC_10:
 280                 pipe_config->pipe_bpp = 30;
 281                 break;
 282         case TRANS_DDI_BPC_12:
 283                 pipe_config->pipe_bpp = 36;
 284                 break;
 285         default:
 286                 break;
 287         }
 288         pipe_config->base.adjusted_mode.flags |= flags;
 289         intel_dp_get_m_n(crtc, pipe_config);
 290
 291         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 292 }
 293
 294 static 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         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 302         if (!edid)
 303                 return 0;
 304
 305         ret = intel_connector_update_modes(connector, edid);
 306         kfree(edid);
 307
 308         return ret;
 309 }
 310
 311 static enum drm_connector_status
 312 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 313 {
 314         struct intel_connector *intel_connector = to_intel_connector(connector);
 315         struct intel_dp *intel_dp = intel_connector->mst_port;
 316
 317         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 318 }
 319
 320 static int
 321 intel_dp_mst_set_property(struct drm_connector *connector,
 322                           struct drm_property *property,
 323                           uint64_t val)
 324 {
 325         return 0;
 326 }
 327
 328 static void
 329 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 330 {
 331         struct intel_connector *intel_connector = to_intel_connector(connector);
 332
 333         if (!IS_ERR_OR_NULL(intel_connector->edid))
 334                 kfree(intel_connector->edid);
 335
 336         drm_connector_cleanup(connector);
 337         kfree(connector);
 338 }
 339
 340 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 341         .dpms = drm_atomic_helper_connector_dpms,
 342         .detect = intel_dp_mst_detect,
 343         .fill_modes = drm_helper_probe_single_connector_modes,
 344         .set_property = intel_dp_mst_set_property,
 345         .atomic_get_property = intel_connector_atomic_get_property,
 346         .destroy = intel_dp_mst_connector_destroy,
 347         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 348         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 349 };
 350
 351 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 352 {
 353         return intel_dp_mst_get_ddc_modes(connector);
 354 }
 355
 356 static enum drm_mode_status
 357 intel_dp_mst_mode_valid(struct drm_connector *connector,
 358                         struct drm_display_mode *mode)
 359 {
 360         /* TODO - validate mode against available PBN for link */
 361         if (mode->clock < 10000)
 362                 return MODE_CLOCK_LOW;
 363
 364         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 365                 return MODE_H_ILLEGAL;
 366
 367         return MODE_OK;
 368 }
 369
 370 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 371                                                          struct drm_connector_state *state)
 372 {
 373         struct intel_connector *intel_connector = to_intel_connector(connector);
 374         struct intel_dp *intel_dp = intel_connector->mst_port;
 375         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 376
 377         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 378 }
 379
 380 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 381 {
 382         struct intel_connector *intel_connector = to_intel_connector(connector);
 383         struct intel_dp *intel_dp = intel_connector->mst_port;
 384         return &intel_dp->mst_encoders[0]->base.base;
 385 }
 386
 387 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 388         .get_modes = intel_dp_mst_get_modes,
 389         .mode_valid = intel_dp_mst_mode_valid,
 390         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 391         .best_encoder = intel_mst_best_encoder,
 392 };
 393
 394 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 395 {
 396         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 397
 398         drm_encoder_cleanup(encoder);
 399         kfree(intel_mst);
 400 }
 401
 402 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 403         .destroy = intel_dp_mst_encoder_destroy,
 404 };
 405
 406 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 407 {
 408         if (connector->encoder && connector->base.state->crtc) {
 409                 enum pipe pipe;
 410                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 411                         return false;
 412                 return true;
 413         }
 414         return false;
 415 }
 416
 417 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 418 {
 419 #ifdef CONFIG_DRM_FBDEV_EMULATION
 420         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 421         drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
 422 #endif
 423 }
 424
 425 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 426 {
 427 #ifdef CONFIG_DRM_FBDEV_EMULATION
 428         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 429         drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
 430 #endif
 431 }
 432
 433 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)
 434 {
 435         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 436         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 437         struct drm_device *dev = intel_dig_port->base.base.dev;
 438         struct intel_connector *intel_connector;
 439         struct drm_connector *connector;
 440         int i;
 441
 442         intel_connector = intel_connector_alloc();
 443         if (!intel_connector)
 444                 return NULL;
 445
 446         connector = &intel_connector->base;
 447         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 448         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 449
 450         intel_connector->unregister = intel_connector_unregister;
 451         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 452         intel_connector->mst_port = intel_dp;
 453         intel_connector->port = port;
 454
 455         for (i = PIPE_A; i <= PIPE_C; i++) {
 456                 drm_mode_connector_attach_encoder(&intel_connector->base,
 457                                                   &intel_dp->mst_encoders[i]->base.base);
 458         }
 459         intel_dp_add_properties(intel_dp, connector);
 460
 461         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 462         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 463
 464         drm_mode_connector_set_path_property(connector, pathprop);
 465         drm_modeset_lock_all(dev);
 466         intel_connector_add_to_fbdev(intel_connector);
 467         drm_modeset_unlock_all(dev);
 468         drm_connector_register(&intel_connector->base);
 469         return connector;
 470 }
 471
 472 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 473                                            struct drm_connector *connector)
 474 {
 475         struct intel_connector *intel_connector = to_intel_connector(connector);
 476         struct drm_device *dev = connector->dev;
 477
 478         /* need to nuke the connector */
 479         drm_modeset_lock_all(dev);
 480         if (connector->state->crtc) {
 481                 struct drm_mode_set set;
 482                 int ret;
 483
 484                 memset(&set, 0, sizeof(set));
 485                 set.crtc = connector->state->crtc,
 486
 487                 ret = drm_atomic_helper_set_config(&set);
 488
 489                 WARN(ret, "Disabling mst crtc failed with %i\n", ret);
 490         }
 491         drm_modeset_unlock_all(dev);
 492
 493         intel_connector->unregister(intel_connector);
 494
 495         drm_modeset_lock_all(dev);
 496         intel_connector_remove_from_fbdev(intel_connector);
 497         drm_connector_cleanup(connector);
 498         drm_modeset_unlock_all(dev);
 499
 500         kfree(intel_connector);
 501         DRM_DEBUG_KMS("\n");
 502 }
 503
 504 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 505 {
 506         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 507         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 508         struct drm_device *dev = intel_dig_port->base.base.dev;
 509
 510         drm_kms_helper_hotplug_event(dev);
 511 }
 512
 513 static struct drm_dp_mst_topology_cbs mst_cbs = {
 514         .add_connector = intel_dp_add_mst_connector,
 515         .destroy_connector = intel_dp_destroy_mst_connector,
 516         .hotplug = intel_dp_mst_hotplug,
 517 };
 518
 519 static struct intel_dp_mst_encoder *
 520 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 521 {
 522         struct intel_dp_mst_encoder *intel_mst;
 523         struct intel_encoder *intel_encoder;
 524         struct drm_device *dev = intel_dig_port->base.base.dev;
 525
 526         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 527
 528         if (!intel_mst)
 529                 return NULL;
 530
 531         intel_mst->pipe = pipe;
 532         intel_encoder = &intel_mst->base;
 533         intel_mst->primary = intel_dig_port;
 534
 535         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 536                          DRM_MODE_ENCODER_DPMST);
 537
 538         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 539         intel_encoder->crtc_mask = 0x7;
 540         intel_encoder->cloneable = 0;
 541
 542         intel_encoder->compute_config = intel_dp_mst_compute_config;
 543         intel_encoder->disable = intel_mst_disable_dp;
 544         intel_encoder->post_disable = intel_mst_post_disable_dp;
 545         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 546         intel_encoder->enable = intel_mst_enable_dp;
 547         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 548         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 549
 550         return intel_mst;
 551
 552 }
 553
 554 static bool
 555 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 556 {
 557         int i;
 558         struct intel_dp *intel_dp = &intel_dig_port->dp;
 559
 560         for (i = PIPE_A; i <= PIPE_C; i++)
 561                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 562         return true;
 563 }
 564
 565 int
 566 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 567 {
 568         struct intel_dp *intel_dp = &intel_dig_port->dp;
 569         struct drm_device *dev = intel_dig_port->base.base.dev;
 570         int ret;
 571
 572         intel_dp->can_mst = true;
 573         intel_dp->mst_mgr.cbs = &mst_cbs;
 574
 575         /* create encoders */
 576         intel_dp_create_fake_mst_encoders(intel_dig_port);
 577         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 578         if (ret) {
 579                 intel_dp->can_mst = false;
 580                 return ret;
 581         }
 582         return 0;
 583 }
 584
 585 void
 586 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 587 {
 588         struct intel_dp *intel_dp = &intel_dig_port->dp;
 589
 590         if (!intel_dp->can_mst)
 591                 return;
 592
 593         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 594         /* encoders will get killed by normal cleanup */
 595 }