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         if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, found->port))
  82                 pipe_config->has_audio = true;
  83         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
  84
  85         pipe_config->pbn = mst_pbn;
  86         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  87
  88         intel_link_compute_m_n(bpp, lane_count,
  89                                adjusted_mode->crtc_clock,
  90                                pipe_config->port_clock,
  91                                &pipe_config->dp_m_n);
  92
  93         pipe_config->dp_m_n.tu = slots;
  94
  95         if (IS_HASWELL(dev) || IS_BROADWELL(dev))
  96                 hsw_dp_set_ddi_pll_sel(pipe_config);
  97
  98         return true;
  99
 100 }
 101
 102 static void intel_mst_disable_dp(struct intel_encoder *encoder)
 103 {
 104         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 105         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 106         struct intel_dp *intel_dp = &intel_dig_port->dp;
 107         struct drm_device *dev = encoder->base.dev;
 108         struct drm_i915_private *dev_priv = dev->dev_private;
 109         struct drm_crtc *crtc = encoder->base.crtc;
 110         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 111
 112         int ret;
 113
 114         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 115
 116         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
 117
 118         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 119         if (ret) {
 120                 DRM_ERROR("failed to update payload %d\n", ret);
 121         }
 122         if (intel_crtc->config->has_audio) {
 123                 intel_audio_codec_disable(encoder);
 124                 intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
 125         }
 126 }
 127
 128 static void intel_mst_post_disable_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
 134         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 135
 136         /* this can fail */
 137         drm_dp_check_act_status(&intel_dp->mst_mgr);
 138         /* and this can also fail */
 139         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 140
 141         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
 142
 143         intel_dp->active_mst_links--;
 144         intel_mst->port = NULL;
 145         if (intel_dp->active_mst_links == 0) {
 146                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 147                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 148         }
 149 }
 150
 151 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 152 {
 153         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 154         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 155         struct intel_dp *intel_dp = &intel_dig_port->dp;
 156         struct drm_device *dev = encoder->base.dev;
 157         struct drm_i915_private *dev_priv = dev->dev_private;
 158         enum port port = intel_dig_port->port;
 159         int ret;
 160         uint32_t temp;
 161         struct intel_connector *found = NULL, *connector;
 162         int slots;
 163         struct drm_crtc *crtc = encoder->base.crtc;
 164         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 165
 166         for_each_intel_connector(dev, connector) {
 167                 if (connector->base.state->best_encoder == &encoder->base) {
 168                         found = connector;
 169                         break;
 170                 }
 171         }
 172
 173         if (!found) {
 174                 DRM_ERROR("can't find connector\n");
 175                 return;
 176         }
 177
 178         /* MST encoders are bound to a crtc, not to a connector,
 179          * force the mapping here for get_hw_state.
 180          */
 181         found->encoder = encoder;
 182
 183         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 184         intel_mst->port = found->port;
 185
 186         if (intel_dp->active_mst_links == 0) {
 187                 intel_ddi_clk_select(encoder, intel_crtc->config);
 188
 189                 intel_dp_set_link_params(intel_dp, intel_crtc->config);
 190
 191                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 192
 193                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 194
 195                 intel_dp_start_link_train(intel_dp);
 196                 intel_dp_stop_link_train(intel_dp);
 197         }
 198
 199         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 200                                        intel_mst->port,
 201                                        intel_crtc->config->pbn, &slots);
 202         if (ret == false) {
 203                 DRM_ERROR("failed to allocate vcpi\n");
 204                 return;
 205         }
 206
 207
 208         intel_dp->active_mst_links++;
 209         temp = I915_READ(DP_TP_STATUS(port));
 210         I915_WRITE(DP_TP_STATUS(port), temp);
 211
 212         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 213 }
 214
 215 static void intel_mst_enable_dp(struct intel_encoder *encoder)
 216 {
 217         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 218         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 219         struct intel_dp *intel_dp = &intel_dig_port->dp;
 220         struct drm_device *dev = intel_dig_port->base.base.dev;
 221         struct drm_i915_private *dev_priv = dev->dev_private;
 222         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 223         enum port port = intel_dig_port->port;
 224         int ret;
 225
 226         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 227
 228         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
 229                      1))
 230                 DRM_ERROR("Timed out waiting for ACT sent\n");
 231
 232         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 233
 234         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 235
 236         if (crtc->config->has_audio) {
 237                 DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
 238                                  pipe_name(crtc->pipe));
 239                 intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
 240                 intel_audio_codec_enable(encoder);
 241         }
 242 }
 243
 244 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 245                                       enum pipe *pipe)
 246 {
 247         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 248         *pipe = intel_mst->pipe;
 249         if (intel_mst->port)
 250                 return true;
 251         return false;
 252 }
 253
 254 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 255                                         struct intel_crtc_state *pipe_config)
 256 {
 257         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 258         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 259         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 260         struct drm_device *dev = encoder->base.dev;
 261         struct drm_i915_private *dev_priv = dev->dev_private;
 262         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 263         u32 temp, flags = 0;
 264
 265         pipe_config->has_dp_encoder = true;
 266
 267         pipe_config->has_audio =
 268                 intel_ddi_is_audio_enabled(dev_priv, crtc);
 269
 270         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 271         if (temp & TRANS_DDI_PHSYNC)
 272                 flags |= DRM_MODE_FLAG_PHSYNC;
 273         else
 274                 flags |= DRM_MODE_FLAG_NHSYNC;
 275         if (temp & TRANS_DDI_PVSYNC)
 276                 flags |= DRM_MODE_FLAG_PVSYNC;
 277         else
 278                 flags |= DRM_MODE_FLAG_NVSYNC;
 279
 280         switch (temp & TRANS_DDI_BPC_MASK) {
 281         case TRANS_DDI_BPC_6:
 282                 pipe_config->pipe_bpp = 18;
 283                 break;
 284         case TRANS_DDI_BPC_8:
 285                 pipe_config->pipe_bpp = 24;
 286                 break;
 287         case TRANS_DDI_BPC_10:
 288                 pipe_config->pipe_bpp = 30;
 289                 break;
 290         case TRANS_DDI_BPC_12:
 291                 pipe_config->pipe_bpp = 36;
 292                 break;
 293         default:
 294                 break;
 295         }
 296         pipe_config->base.adjusted_mode.flags |= flags;
 297
 298         pipe_config->lane_count =
 299                 ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
 300
 301         intel_dp_get_m_n(crtc, pipe_config);
 302
 303         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 304 }
 305
 306 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 307 {
 308         struct intel_connector *intel_connector = to_intel_connector(connector);
 309         struct intel_dp *intel_dp = intel_connector->mst_port;
 310         struct edid *edid;
 311         int ret;
 312
 313         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 314         if (!edid)
 315                 return 0;
 316
 317         ret = intel_connector_update_modes(connector, edid);
 318         kfree(edid);
 319
 320         return ret;
 321 }
 322
 323 static enum drm_connector_status
 324 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 325 {
 326         struct intel_connector *intel_connector = to_intel_connector(connector);
 327         struct intel_dp *intel_dp = intel_connector->mst_port;
 328
 329         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 330 }
 331
 332 static int
 333 intel_dp_mst_set_property(struct drm_connector *connector,
 334                           struct drm_property *property,
 335                           uint64_t val)
 336 {
 337         return 0;
 338 }
 339
 340 static void
 341 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 342 {
 343         struct intel_connector *intel_connector = to_intel_connector(connector);
 344
 345         if (!IS_ERR_OR_NULL(intel_connector->edid))
 346                 kfree(intel_connector->edid);
 347
 348         drm_connector_cleanup(connector);
 349         kfree(connector);
 350 }
 351
 352 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 353         .dpms = drm_atomic_helper_connector_dpms,
 354         .detect = intel_dp_mst_detect,
 355         .fill_modes = drm_helper_probe_single_connector_modes,
 356         .set_property = intel_dp_mst_set_property,
 357         .atomic_get_property = intel_connector_atomic_get_property,
 358         .destroy = intel_dp_mst_connector_destroy,
 359         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 360         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 361 };
 362
 363 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 364 {
 365         return intel_dp_mst_get_ddc_modes(connector);
 366 }
 367
 368 static enum drm_mode_status
 369 intel_dp_mst_mode_valid(struct drm_connector *connector,
 370                         struct drm_display_mode *mode)
 371 {
 372         /* TODO - validate mode against available PBN for link */
 373         if (mode->clock < 10000)
 374                 return MODE_CLOCK_LOW;
 375
 376         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 377                 return MODE_H_ILLEGAL;
 378
 379         return MODE_OK;
 380 }
 381
 382 static 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         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 390 }
 391
 392 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 393 {
 394         struct intel_connector *intel_connector = to_intel_connector(connector);
 395         struct intel_dp *intel_dp = intel_connector->mst_port;
 396         return &intel_dp->mst_encoders[0]->base.base;
 397 }
 398
 399 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 400         .get_modes = intel_dp_mst_get_modes,
 401         .mode_valid = intel_dp_mst_mode_valid,
 402         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 403         .best_encoder = intel_mst_best_encoder,
 404 };
 405
 406 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 407 {
 408         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 409
 410         drm_encoder_cleanup(encoder);
 411         kfree(intel_mst);
 412 }
 413
 414 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 415         .destroy = intel_dp_mst_encoder_destroy,
 416 };
 417
 418 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 419 {
 420         if (connector->encoder && connector->base.state->crtc) {
 421                 enum pipe pipe;
 422                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 423                         return false;
 424                 return true;
 425         }
 426         return false;
 427 }
 428
 429 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 430 {
 431 #ifdef CONFIG_DRM_FBDEV_EMULATION
 432         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 433
 434         if (dev_priv->fbdev)
 435                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 436                                                 &connector->base);
 437 #endif
 438 }
 439
 440 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 441 {
 442 #ifdef CONFIG_DRM_FBDEV_EMULATION
 443         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 444
 445         if (dev_priv->fbdev)
 446                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 447                                                    &connector->base);
 448 #endif
 449 }
 450
 451 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)
 452 {
 453         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 454         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 455         struct drm_device *dev = intel_dig_port->base.base.dev;
 456         struct intel_connector *intel_connector;
 457         struct drm_connector *connector;
 458         int i;
 459
 460         intel_connector = intel_connector_alloc();
 461         if (!intel_connector)
 462                 return NULL;
 463
 464         connector = &intel_connector->base;
 465         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 466         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 467
 468         intel_connector->unregister = intel_connector_unregister;
 469         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 470         intel_connector->mst_port = intel_dp;
 471         intel_connector->port = port;
 472
 473         for (i = PIPE_A; i <= PIPE_C; i++) {
 474                 drm_mode_connector_attach_encoder(&intel_connector->base,
 475                                                   &intel_dp->mst_encoders[i]->base.base);
 476         }
 477         intel_dp_add_properties(intel_dp, connector);
 478
 479         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 480         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 481
 482         drm_mode_connector_set_path_property(connector, pathprop);
 483         return connector;
 484 }
 485
 486 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 487 {
 488         struct intel_connector *intel_connector = to_intel_connector(connector);
 489         struct drm_device *dev = connector->dev;
 490         drm_modeset_lock_all(dev);
 491         intel_connector_add_to_fbdev(intel_connector);
 492         drm_modeset_unlock_all(dev);
 493         drm_connector_register(&intel_connector->base);
 494 }
 495
 496 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 497                                            struct drm_connector *connector)
 498 {
 499         struct intel_connector *intel_connector = to_intel_connector(connector);
 500         struct drm_device *dev = connector->dev;
 501
 502         /* need to nuke the connector */
 503         drm_modeset_lock_all(dev);
 504         if (connector->state->crtc) {
 505                 struct drm_mode_set set;
 506                 int ret;
 507
 508                 memset(&set, 0, sizeof(set));
 509                 set.crtc = connector->state->crtc,
 510
 511                 ret = drm_atomic_helper_set_config(&set);
 512
 513                 WARN(ret, "Disabling mst crtc failed with %i\n", ret);
 514         }
 515         drm_modeset_unlock_all(dev);
 516
 517         intel_connector->unregister(intel_connector);
 518
 519         drm_modeset_lock_all(dev);
 520         intel_connector_remove_from_fbdev(intel_connector);
 521         drm_connector_cleanup(connector);
 522         drm_modeset_unlock_all(dev);
 523
 524         kfree(intel_connector);
 525         DRM_DEBUG_KMS("\n");
 526 }
 527
 528 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 529 {
 530         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 531         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 532         struct drm_device *dev = intel_dig_port->base.base.dev;
 533
 534         drm_kms_helper_hotplug_event(dev);
 535 }
 536
 537 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 538         .add_connector = intel_dp_add_mst_connector,
 539         .register_connector = intel_dp_register_mst_connector,
 540         .destroy_connector = intel_dp_destroy_mst_connector,
 541         .hotplug = intel_dp_mst_hotplug,
 542 };
 543
 544 static struct intel_dp_mst_encoder *
 545 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 546 {
 547         struct intel_dp_mst_encoder *intel_mst;
 548         struct intel_encoder *intel_encoder;
 549         struct drm_device *dev = intel_dig_port->base.base.dev;
 550
 551         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 552
 553         if (!intel_mst)
 554                 return NULL;
 555
 556         intel_mst->pipe = pipe;
 557         intel_encoder = &intel_mst->base;
 558         intel_mst->primary = intel_dig_port;
 559
 560         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 561                          DRM_MODE_ENCODER_DPMST, NULL);
 562
 563         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 564         intel_encoder->crtc_mask = 0x7;
 565         intel_encoder->cloneable = 0;
 566
 567         intel_encoder->compute_config = intel_dp_mst_compute_config;
 568         intel_encoder->disable = intel_mst_disable_dp;
 569         intel_encoder->post_disable = intel_mst_post_disable_dp;
 570         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 571         intel_encoder->enable = intel_mst_enable_dp;
 572         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 573         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 574
 575         return intel_mst;
 576
 577 }
 578
 579 static bool
 580 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 581 {
 582         int i;
 583         struct intel_dp *intel_dp = &intel_dig_port->dp;
 584
 585         for (i = PIPE_A; i <= PIPE_C; i++)
 586                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 587         return true;
 588 }
 589
 590 int
 591 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 592 {
 593         struct intel_dp *intel_dp = &intel_dig_port->dp;
 594         struct drm_device *dev = intel_dig_port->base.base.dev;
 595         int ret;
 596
 597         intel_dp->can_mst = true;
 598         intel_dp->mst_mgr.cbs = &mst_cbs;
 599
 600         /* create encoders */
 601         intel_dp_create_fake_mst_encoders(intel_dig_port);
 602         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 603         if (ret) {
 604                 intel_dp->can_mst = false;
 605                 return ret;
 606         }
 607         return 0;
 608 }
 609
 610 void
 611 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 612 {
 613         struct intel_dp *intel_dp = &intel_dig_port->dp;
 614
 615         if (!intel_dp->can_mst)
 616                 return;
 617
 618         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 619         /* encoders will get killed by normal cleanup */
 620 }