kernel/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;
  43         const 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
  60         pipe_config->lane_count = lane_count;
  61
  62         pipe_config->pipe_bpp = 24;
  63         pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
  64
  65         state = pipe_config->base.state;
  66
  67         for_each_connector_in_state(state, drm_connector, connector_state, i) {
  68                 connector = to_intel_connector(drm_connector);
  69
  70                 if (connector_state->best_encoder == &encoder->base) {
  71                         found = connector;
  72                         break;
  73                 }
  74         }
  75
  76         if (!found) {
  77                 DRM_ERROR("can't find connector\n");
  78                 return false;
  79         }
  80
  81         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
  82
  83         pipe_config->pbn = mst_pbn;
  84         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  85
  86         intel_link_compute_m_n(bpp, lane_count,
  87                                adjusted_mode->crtc_clock,
  88                                pipe_config->port_clock,
  89                                &pipe_config->dp_m_n);
  90
  91         pipe_config->dp_m_n.tu = slots;
  92
  93         if (IS_HASWELL(dev) || IS_BROADWELL(dev))
  94                 hsw_dp_set_ddi_pll_sel(pipe_config);
  95
  96         return true;
  97
  98 }
  99
 100 static void intel_mst_disable_dp(struct intel_encoder *encoder)
 101 {
 102         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 103         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 104         struct intel_dp *intel_dp = &intel_dig_port->dp;
 105         int ret;
 106
 107         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 108
 109         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
 110
 111         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 112         if (ret) {
 113                 DRM_ERROR("failed to update payload %d\n", ret);
 114         }
 115 }
 116
 117 static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
 118 {
 119         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 120         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 121         struct intel_dp *intel_dp = &intel_dig_port->dp;
 122
 123         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 124
 125         /* this can fail */
 126         drm_dp_check_act_status(&intel_dp->mst_mgr);
 127         /* and this can also fail */
 128         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 129
 130         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
 131
 132         intel_dp->active_mst_links--;
 133         intel_mst->port = NULL;
 134         if (intel_dp->active_mst_links == 0) {
 135                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 136                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 137         }
 138 }
 139
 140 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 141 {
 142         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 143         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 144         struct intel_dp *intel_dp = &intel_dig_port->dp;
 145         struct drm_device *dev = encoder->base.dev;
 146         struct drm_i915_private *dev_priv = dev->dev_private;
 147         enum port port = intel_dig_port->port;
 148         int ret;
 149         uint32_t temp;
 150         struct intel_connector *found = NULL, *connector;
 151         int slots;
 152         struct drm_crtc *crtc = encoder->base.crtc;
 153         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 154
 155         for_each_intel_connector(dev, connector) {
 156                 if (connector->base.state->best_encoder == &encoder->base) {
 157                         found = connector;
 158                         break;
 159                 }
 160         }
 161
 162         if (!found) {
 163                 DRM_ERROR("can't find connector\n");
 164                 return;
 165         }
 166
 167         /* MST encoders are bound to a crtc, not to a connector,
 168          * force the mapping here for get_hw_state.
 169          */
 170         found->encoder = encoder;
 171
 172         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 173         intel_mst->port = found->port;
 174
 175         if (intel_dp->active_mst_links == 0) {
 176                 enum port port = intel_ddi_get_encoder_port(encoder);
 177
 178                 intel_dp_set_link_params(intel_dp, intel_crtc->config);
 179
 180                 /* FIXME: add support for SKL */
 181                 if (INTEL_INFO(dev)->gen < 9)
 182                         I915_WRITE(PORT_CLK_SEL(port),
 183                                    intel_crtc->config->ddi_pll_sel);
 184
 185                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 186
 187                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 188
 189
 190                 intel_dp_start_link_train(intel_dp);
 191                 intel_dp_stop_link_train(intel_dp);
 192         }
 193
 194         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 195                                        intel_mst->port,
 196                                        intel_crtc->config->pbn, &slots);
 197         if (ret == false) {
 198                 DRM_ERROR("failed to allocate vcpi\n");
 199                 return;
 200         }
 201
 202
 203         intel_dp->active_mst_links++;
 204         temp = I915_READ(DP_TP_STATUS(port));
 205         I915_WRITE(DP_TP_STATUS(port), temp);
 206
 207         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 208 }
 209
 210 static void intel_mst_enable_dp(struct intel_encoder *encoder)
 211 {
 212         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 213         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 214         struct intel_dp *intel_dp = &intel_dig_port->dp;
 215         struct drm_device *dev = intel_dig_port->base.base.dev;
 216         struct drm_i915_private *dev_priv = dev->dev_private;
 217         enum port port = intel_dig_port->port;
 218         int ret;
 219
 220         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 221
 222         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
 223                      1))
 224                 DRM_ERROR("Timed out waiting for ACT sent\n");
 225
 226         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 227
 228         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 229 }
 230
 231 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 232                                       enum pipe *pipe)
 233 {
 234         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 235         *pipe = intel_mst->pipe;
 236         if (intel_mst->port)
 237                 return true;
 238         return false;
 239 }
 240
 241 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 242                                         struct intel_crtc_state *pipe_config)
 243 {
 244         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 245         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 246         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 247         struct drm_device *dev = encoder->base.dev;
 248         struct drm_i915_private *dev_priv = dev->dev_private;
 249         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 250         u32 temp, flags = 0;
 251
 252         pipe_config->has_dp_encoder = true;
 253
 254         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 255         if (temp & TRANS_DDI_PHSYNC)
 256                 flags |= DRM_MODE_FLAG_PHSYNC;
 257         else
 258                 flags |= DRM_MODE_FLAG_NHSYNC;
 259         if (temp & TRANS_DDI_PVSYNC)
 260                 flags |= DRM_MODE_FLAG_PVSYNC;
 261         else
 262                 flags |= DRM_MODE_FLAG_NVSYNC;
 263
 264         switch (temp & TRANS_DDI_BPC_MASK) {
 265         case TRANS_DDI_BPC_6:
 266                 pipe_config->pipe_bpp = 18;
 267                 break;
 268         case TRANS_DDI_BPC_8:
 269                 pipe_config->pipe_bpp = 24;
 270                 break;
 271         case TRANS_DDI_BPC_10:
 272                 pipe_config->pipe_bpp = 30;
 273                 break;
 274         case TRANS_DDI_BPC_12:
 275                 pipe_config->pipe_bpp = 36;
 276                 break;
 277         default:
 278                 break;
 279         }
 280         pipe_config->base.adjusted_mode.flags |= flags;
 281
 282         pipe_config->lane_count =
 283                 ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
 284
 285         intel_dp_get_m_n(crtc, pipe_config);
 286
 287         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 288 }
 289
 290 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 291 {
 292         struct intel_connector *intel_connector = to_intel_connector(connector);
 293         struct intel_dp *intel_dp = intel_connector->mst_port;
 294         struct edid *edid;
 295         int ret;
 296
 297         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 298         if (!edid)
 299                 return 0;
 300
 301         ret = intel_connector_update_modes(connector, edid);
 302         kfree(edid);
 303
 304         return ret;
 305 }
 306
 307 static enum drm_connector_status
 308 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 309 {
 310         struct intel_connector *intel_connector = to_intel_connector(connector);
 311         struct intel_dp *intel_dp = intel_connector->mst_port;
 312
 313         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 314 }
 315
 316 static int
 317 intel_dp_mst_set_property(struct drm_connector *connector,
 318                           struct drm_property *property,
 319                           uint64_t val)
 320 {
 321         return 0;
 322 }
 323
 324 static void
 325 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 326 {
 327         struct intel_connector *intel_connector = to_intel_connector(connector);
 328
 329         if (!IS_ERR_OR_NULL(intel_connector->edid))
 330                 kfree(intel_connector->edid);
 331
 332         drm_connector_cleanup(connector);
 333         kfree(connector);
 334 }
 335
 336 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 337         .dpms = drm_atomic_helper_connector_dpms,
 338         .detect = intel_dp_mst_detect,
 339         .fill_modes = drm_helper_probe_single_connector_modes,
 340         .set_property = intel_dp_mst_set_property,
 341         .atomic_get_property = intel_connector_atomic_get_property,
 342         .destroy = intel_dp_mst_connector_destroy,
 343         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 344         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 345 };
 346
 347 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 348 {
 349         return intel_dp_mst_get_ddc_modes(connector);
 350 }
 351
 352 static enum drm_mode_status
 353 intel_dp_mst_mode_valid(struct drm_connector *connector,
 354                         struct drm_display_mode *mode)
 355 {
 356         /* TODO - validate mode against available PBN for link */
 357         if (mode->clock < 10000)
 358                 return MODE_CLOCK_LOW;
 359
 360         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 361                 return MODE_H_ILLEGAL;
 362
 363         return MODE_OK;
 364 }
 365
 366 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 367                                                          struct drm_connector_state *state)
 368 {
 369         struct intel_connector *intel_connector = to_intel_connector(connector);
 370         struct intel_dp *intel_dp = intel_connector->mst_port;
 371         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 372
 373         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 374 }
 375
 376 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 377 {
 378         struct intel_connector *intel_connector = to_intel_connector(connector);
 379         struct intel_dp *intel_dp = intel_connector->mst_port;
 380         return &intel_dp->mst_encoders[0]->base.base;
 381 }
 382
 383 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 384         .get_modes = intel_dp_mst_get_modes,
 385         .mode_valid = intel_dp_mst_mode_valid,
 386         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 387         .best_encoder = intel_mst_best_encoder,
 388 };
 389
 390 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 391 {
 392         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 393
 394         drm_encoder_cleanup(encoder);
 395         kfree(intel_mst);
 396 }
 397
 398 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 399         .destroy = intel_dp_mst_encoder_destroy,
 400 };
 401
 402 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 403 {
 404         if (connector->encoder && connector->base.state->crtc) {
 405                 enum pipe pipe;
 406                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 407                         return false;
 408                 return true;
 409         }
 410         return false;
 411 }
 412
 413 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 414 {
 415 #ifdef CONFIG_DRM_FBDEV_EMULATION
 416         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 417         drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
 418 #endif
 419 }
 420
 421 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 422 {
 423 #ifdef CONFIG_DRM_FBDEV_EMULATION
 424         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 425         drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
 426 #endif
 427 }
 428
 429 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)
 430 {
 431         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 432         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 433         struct drm_device *dev = intel_dig_port->base.base.dev;
 434         struct intel_connector *intel_connector;
 435         struct drm_connector *connector;
 436         int i;
 437
 438         intel_connector = intel_connector_alloc();
 439         if (!intel_connector)
 440                 return NULL;
 441
 442         connector = &intel_connector->base;
 443         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 444         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 445
 446         intel_connector->unregister = intel_connector_unregister;
 447         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 448         intel_connector->mst_port = intel_dp;
 449         intel_connector->port = port;
 450
 451         for (i = PIPE_A; i <= PIPE_C; i++) {
 452                 drm_mode_connector_attach_encoder(&intel_connector->base,
 453                                                   &intel_dp->mst_encoders[i]->base.base);
 454         }
 455         intel_dp_add_properties(intel_dp, connector);
 456
 457         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 458         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 459
 460         drm_mode_connector_set_path_property(connector, pathprop);
 461         return connector;
 462 }
 463
 464 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 465 {
 466         struct intel_connector *intel_connector = to_intel_connector(connector);
 467         struct drm_device *dev = connector->dev;
 468         drm_modeset_lock_all(dev);
 469         intel_connector_add_to_fbdev(intel_connector);
 470         drm_modeset_unlock_all(dev);
 471         drm_connector_register(&intel_connector->base);
 472 }
 473
 474 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 475                                            struct drm_connector *connector)
 476 {
 477         struct intel_connector *intel_connector = to_intel_connector(connector);
 478         struct drm_device *dev = connector->dev;
 479
 480         /* need to nuke the connector */
 481         drm_modeset_lock_all(dev);
 482         if (connector->state->crtc) {
 483                 struct drm_mode_set set;
 484                 int ret;
 485
 486                 memset(&set, 0, sizeof(set));
 487                 set.crtc = connector->state->crtc,
 488
 489                 ret = drm_atomic_helper_set_config(&set);
 490
 491                 WARN(ret, "Disabling mst crtc failed with %i\n", ret);
 492         }
 493         drm_modeset_unlock_all(dev);
 494
 495         intel_connector->unregister(intel_connector);
 496
 497         drm_modeset_lock_all(dev);
 498         intel_connector_remove_from_fbdev(intel_connector);
 499         drm_connector_cleanup(connector);
 500         drm_modeset_unlock_all(dev);
 501
 502         kfree(intel_connector);
 503         DRM_DEBUG_KMS("\n");
 504 }
 505
 506 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 507 {
 508         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 509         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 510         struct drm_device *dev = intel_dig_port->base.base.dev;
 511
 512         drm_kms_helper_hotplug_event(dev);
 513 }
 514
 515 static struct drm_dp_mst_topology_cbs mst_cbs = {
 516         .add_connector = intel_dp_add_mst_connector,
 517         .register_connector = intel_dp_register_mst_connector,
 518         .destroy_connector = intel_dp_destroy_mst_connector,
 519         .hotplug = intel_dp_mst_hotplug,
 520 };
 521
 522 static struct intel_dp_mst_encoder *
 523 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 524 {
 525         struct intel_dp_mst_encoder *intel_mst;
 526         struct intel_encoder *intel_encoder;
 527         struct drm_device *dev = intel_dig_port->base.base.dev;
 528
 529         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 530
 531         if (!intel_mst)
 532                 return NULL;
 533
 534         intel_mst->pipe = pipe;
 535         intel_encoder = &intel_mst->base;
 536         intel_mst->primary = intel_dig_port;
 537
 538         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 539                          DRM_MODE_ENCODER_DPMST);
 540
 541         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 542         intel_encoder->crtc_mask = 0x7;
 543         intel_encoder->cloneable = 0;
 544
 545         intel_encoder->compute_config = intel_dp_mst_compute_config;
 546         intel_encoder->disable = intel_mst_disable_dp;
 547         intel_encoder->post_disable = intel_mst_post_disable_dp;
 548         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 549         intel_encoder->enable = intel_mst_enable_dp;
 550         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 551         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 552
 553         return intel_mst;
 554
 555 }
 556
 557 static bool
 558 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 559 {
 560         int i;
 561         struct intel_dp *intel_dp = &intel_dig_port->dp;
 562
 563         for (i = PIPE_A; i <= PIPE_C; i++)
 564                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 565         return true;
 566 }
 567
 568 int
 569 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 570 {
 571         struct intel_dp *intel_dp = &intel_dig_port->dp;
 572         struct drm_device *dev = intel_dig_port->base.base.dev;
 573         int ret;
 574
 575         intel_dp->can_mst = true;
 576         intel_dp->mst_mgr.cbs = &mst_cbs;
 577
 578         /* create encoders */
 579         intel_dp_create_fake_mst_encoders(intel_dig_port);
 580         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 581         if (ret) {
 582                 intel_dp->can_mst = false;
 583                 return ret;
 584         }
 585         return 0;
 586 }
 587
 588 void
 589 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 590 {
 591         struct intel_dp *intel_dp = &intel_dig_port->dp;
 592
 593         if (!intel_dp->can_mst)
 594                 return;
 595
 596         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 597         /* encoders will get killed by normal cleanup */
 598 }