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 intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  37         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  38         struct intel_dp *intel_dp = &intel_dig_port->dp;
  39         struct drm_atomic_state *state;
  40         int bpp, i;
  41         int lane_count, slots;
  42         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  43         struct drm_connector *drm_connector;
  44         struct intel_connector *connector, *found = NULL;
  45         struct drm_connector_state *connector_state;
  46         int mst_pbn;
  47
  48         pipe_config->dp_encoder_is_mst = true;
  49         pipe_config->has_pch_encoder = false;
  50         pipe_config->has_dp_encoder = true;
  51         bpp = 24;
  52         /*
  53          * for MST we always configure max link bw - the spec doesn't
  54          * seem to suggest we should do otherwise.
  55          */
  56         lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
  57
  58
  59         pipe_config->lane_count = lane_count;
  60
  61         pipe_config->pipe_bpp = 24;
  62         pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
  63
  64         state = pipe_config->base.state;
  65
  66         for_each_connector_in_state(state, drm_connector, connector_state, i) {
  67                 connector = to_intel_connector(drm_connector);
  68
  69                 if (connector_state->best_encoder == &encoder->base) {
  70                         found = connector;
  71                         break;
  72                 }
  73         }
  74
  75         if (!found) {
  76                 DRM_ERROR("can't find connector\n");
  77                 return false;
  78         }
  79
  80         if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, found->port))
  81                 pipe_config->has_audio = true;
  82         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
  83
  84         pipe_config->pbn = mst_pbn;
  85         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  86
  87         intel_link_compute_m_n(bpp, lane_count,
  88                                adjusted_mode->crtc_clock,
  89                                pipe_config->port_clock,
  90                                &pipe_config->dp_m_n);
  91
  92         pipe_config->dp_m_n.tu = slots;
  93
  94         return true;
  95
  96 }
  97
  98 static void intel_mst_disable_dp(struct intel_encoder *encoder)
  99 {
 100         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 101         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 102         struct intel_dp *intel_dp = &intel_dig_port->dp;
 103         struct drm_device *dev = encoder->base.dev;
 104         struct drm_i915_private *dev_priv = dev->dev_private;
 105         struct drm_crtc *crtc = encoder->base.crtc;
 106         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 107
 108         int ret;
 109
 110         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 111
 112         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
 113
 114         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 115         if (ret) {
 116                 DRM_ERROR("failed to update payload %d\n", ret);
 117         }
 118         if (intel_crtc->config->has_audio) {
 119                 intel_audio_codec_disable(encoder);
 120                 intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
 121         }
 122 }
 123
 124 static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
 125 {
 126         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 127         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 128         struct intel_dp *intel_dp = &intel_dig_port->dp;
 129
 130         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 131
 132         /* this can fail */
 133         drm_dp_check_act_status(&intel_dp->mst_mgr);
 134         /* and this can also fail */
 135         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 136
 137         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
 138
 139         intel_dp->active_mst_links--;
 140         intel_mst->port = NULL;
 141         if (intel_dp->active_mst_links == 0) {
 142                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 143                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 144         }
 145 }
 146
 147 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 148 {
 149         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 150         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 151         struct intel_dp *intel_dp = &intel_dig_port->dp;
 152         struct drm_device *dev = encoder->base.dev;
 153         struct drm_i915_private *dev_priv = dev->dev_private;
 154         enum port port = intel_dig_port->port;
 155         int ret;
 156         uint32_t temp;
 157         struct intel_connector *found = NULL, *connector;
 158         int slots;
 159         struct drm_crtc *crtc = encoder->base.crtc;
 160         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 161
 162         for_each_intel_connector(dev, connector) {
 163                 if (connector->base.state->best_encoder == &encoder->base) {
 164                         found = connector;
 165                         break;
 166                 }
 167         }
 168
 169         if (!found) {
 170                 DRM_ERROR("can't find connector\n");
 171                 return;
 172         }
 173
 174         /* MST encoders are bound to a crtc, not to a connector,
 175          * force the mapping here for get_hw_state.
 176          */
 177         found->encoder = encoder;
 178
 179         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 180         intel_mst->port = found->port;
 181
 182         if (intel_dp->active_mst_links == 0) {
 183                 intel_prepare_ddi_buffer(&intel_dig_port->base);
 184
 185                 intel_ddi_clk_select(&intel_dig_port->base, intel_crtc->config);
 186
 187                 intel_dp_set_link_params(intel_dp, intel_crtc->config);
 188
 189                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 190
 191                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 192
 193                 intel_dp_start_link_train(intel_dp);
 194                 intel_dp_stop_link_train(intel_dp);
 195         }
 196
 197         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 198                                        intel_mst->port,
 199                                        intel_crtc->config->pbn, &slots);
 200         if (ret == false) {
 201                 DRM_ERROR("failed to allocate vcpi\n");
 202                 return;
 203         }
 204
 205
 206         intel_dp->active_mst_links++;
 207         temp = I915_READ(DP_TP_STATUS(port));
 208         I915_WRITE(DP_TP_STATUS(port), temp);
 209
 210         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 211 }
 212
 213 static void intel_mst_enable_dp(struct intel_encoder *encoder)
 214 {
 215         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 216         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 217         struct intel_dp *intel_dp = &intel_dig_port->dp;
 218         struct drm_device *dev = intel_dig_port->base.base.dev;
 219         struct drm_i915_private *dev_priv = dev->dev_private;
 220         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 221         enum port port = intel_dig_port->port;
 222         int ret;
 223
 224         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 225
 226         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
 227                      1))
 228                 DRM_ERROR("Timed out waiting for ACT sent\n");
 229
 230         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 231
 232         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 233
 234         if (crtc->config->has_audio) {
 235                 DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
 236                                  pipe_name(crtc->pipe));
 237                 intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
 238                 intel_audio_codec_enable(encoder);
 239         }
 240 }
 241
 242 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 243                                       enum pipe *pipe)
 244 {
 245         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 246         *pipe = intel_mst->pipe;
 247         if (intel_mst->port)
 248                 return true;
 249         return false;
 250 }
 251
 252 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 253                                         struct intel_crtc_state *pipe_config)
 254 {
 255         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 256         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 257         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 258         struct drm_device *dev = encoder->base.dev;
 259         struct drm_i915_private *dev_priv = dev->dev_private;
 260         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 261         u32 temp, flags = 0;
 262
 263         pipe_config->has_dp_encoder = true;
 264
 265         pipe_config->has_audio =
 266                 intel_ddi_is_audio_enabled(dev_priv, crtc);
 267
 268         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 269         if (temp & TRANS_DDI_PHSYNC)
 270                 flags |= DRM_MODE_FLAG_PHSYNC;
 271         else
 272                 flags |= DRM_MODE_FLAG_NHSYNC;
 273         if (temp & TRANS_DDI_PVSYNC)
 274                 flags |= DRM_MODE_FLAG_PVSYNC;
 275         else
 276                 flags |= DRM_MODE_FLAG_NVSYNC;
 277
 278         switch (temp & TRANS_DDI_BPC_MASK) {
 279         case TRANS_DDI_BPC_6:
 280                 pipe_config->pipe_bpp = 18;
 281                 break;
 282         case TRANS_DDI_BPC_8:
 283                 pipe_config->pipe_bpp = 24;
 284                 break;
 285         case TRANS_DDI_BPC_10:
 286                 pipe_config->pipe_bpp = 30;
 287                 break;
 288         case TRANS_DDI_BPC_12:
 289                 pipe_config->pipe_bpp = 36;
 290                 break;
 291         default:
 292                 break;
 293         }
 294         pipe_config->base.adjusted_mode.flags |= flags;
 295
 296         pipe_config->lane_count =
 297                 ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
 298
 299         intel_dp_get_m_n(crtc, pipe_config);
 300
 301         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 302 }
 303
 304 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 305 {
 306         struct intel_connector *intel_connector = to_intel_connector(connector);
 307         struct intel_dp *intel_dp = intel_connector->mst_port;
 308         struct edid *edid;
 309         int ret;
 310
 311         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 312         if (!edid)
 313                 return 0;
 314
 315         ret = intel_connector_update_modes(connector, edid);
 316         kfree(edid);
 317
 318         return ret;
 319 }
 320
 321 static enum drm_connector_status
 322 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 323 {
 324         struct intel_connector *intel_connector = to_intel_connector(connector);
 325         struct intel_dp *intel_dp = intel_connector->mst_port;
 326
 327         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 328 }
 329
 330 static int
 331 intel_dp_mst_set_property(struct drm_connector *connector,
 332                           struct drm_property *property,
 333                           uint64_t val)
 334 {
 335         return 0;
 336 }
 337
 338 static void
 339 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 340 {
 341         struct intel_connector *intel_connector = to_intel_connector(connector);
 342
 343         if (!IS_ERR_OR_NULL(intel_connector->edid))
 344                 kfree(intel_connector->edid);
 345
 346         drm_connector_cleanup(connector);
 347         kfree(connector);
 348 }
 349
 350 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 351         .dpms = drm_atomic_helper_connector_dpms,
 352         .detect = intel_dp_mst_detect,
 353         .fill_modes = drm_helper_probe_single_connector_modes,
 354         .set_property = intel_dp_mst_set_property,
 355         .atomic_get_property = intel_connector_atomic_get_property,
 356         .destroy = intel_dp_mst_connector_destroy,
 357         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 358         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 359 };
 360
 361 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 362 {
 363         return intel_dp_mst_get_ddc_modes(connector);
 364 }
 365
 366 static enum drm_mode_status
 367 intel_dp_mst_mode_valid(struct drm_connector *connector,
 368                         struct drm_display_mode *mode)
 369 {
 370         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 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         if (mode->clock > max_dotclk)
 380                 return MODE_CLOCK_HIGH;
 381
 382         return MODE_OK;
 383 }
 384
 385 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 386                                                          struct drm_connector_state *state)
 387 {
 388         struct intel_connector *intel_connector = to_intel_connector(connector);
 389         struct intel_dp *intel_dp = intel_connector->mst_port;
 390         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 391
 392         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 393 }
 394
 395 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 396 {
 397         struct intel_connector *intel_connector = to_intel_connector(connector);
 398         struct intel_dp *intel_dp = intel_connector->mst_port;
 399         return &intel_dp->mst_encoders[0]->base.base;
 400 }
 401
 402 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 403         .get_modes = intel_dp_mst_get_modes,
 404         .mode_valid = intel_dp_mst_mode_valid,
 405         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 406         .best_encoder = intel_mst_best_encoder,
 407 };
 408
 409 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 410 {
 411         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 412
 413         drm_encoder_cleanup(encoder);
 414         kfree(intel_mst);
 415 }
 416
 417 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 418         .destroy = intel_dp_mst_encoder_destroy,
 419 };
 420
 421 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 422 {
 423         if (connector->encoder && connector->base.state->crtc) {
 424                 enum pipe pipe;
 425                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 426                         return false;
 427                 return true;
 428         }
 429         return false;
 430 }
 431
 432 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 433 {
 434 #ifdef CONFIG_DRM_FBDEV_EMULATION
 435         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 436
 437         if (dev_priv->fbdev)
 438                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 439                                                 &connector->base);
 440 #endif
 441 }
 442
 443 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 444 {
 445 #ifdef CONFIG_DRM_FBDEV_EMULATION
 446         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 447
 448         if (dev_priv->fbdev)
 449                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 450                                                    &connector->base);
 451 #endif
 452 }
 453
 454 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)
 455 {
 456         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 457         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 458         struct drm_device *dev = intel_dig_port->base.base.dev;
 459         struct intel_connector *intel_connector;
 460         struct drm_connector *connector;
 461         int i;
 462
 463         intel_connector = intel_connector_alloc();
 464         if (!intel_connector)
 465                 return NULL;
 466
 467         connector = &intel_connector->base;
 468         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 469         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 470
 471         intel_connector->unregister = intel_connector_unregister;
 472         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 473         intel_connector->mst_port = intel_dp;
 474         intel_connector->port = port;
 475
 476         for (i = PIPE_A; i <= PIPE_C; i++) {
 477                 drm_mode_connector_attach_encoder(&intel_connector->base,
 478                                                   &intel_dp->mst_encoders[i]->base.base);
 479         }
 480         intel_dp_add_properties(intel_dp, connector);
 481
 482         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 483         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 484
 485         drm_mode_connector_set_path_property(connector, pathprop);
 486         return connector;
 487 }
 488
 489 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 490 {
 491         struct intel_connector *intel_connector = to_intel_connector(connector);
 492         struct drm_device *dev = connector->dev;
 493         drm_modeset_lock_all(dev);
 494         intel_connector_add_to_fbdev(intel_connector);
 495         drm_modeset_unlock_all(dev);
 496         drm_connector_register(&intel_connector->base);
 497 }
 498
 499 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 500                                            struct drm_connector *connector)
 501 {
 502         struct intel_connector *intel_connector = to_intel_connector(connector);
 503         struct drm_device *dev = connector->dev;
 504
 505         intel_connector->unregister(intel_connector);
 506
 507         /* need to nuke the connector */
 508         drm_modeset_lock_all(dev);
 509         if (connector->state->crtc) {
 510                 struct drm_mode_set set;
 511                 int ret;
 512
 513                 memset(&set, 0, sizeof(set));
 514                 set.crtc = connector->state->crtc,
 515
 516                 ret = drm_atomic_helper_set_config(&set);
 517
 518                 WARN(ret, "Disabling mst crtc failed with %i\n", ret);
 519         }
 520
 521         intel_connector_remove_from_fbdev(intel_connector);
 522         drm_connector_cleanup(connector);
 523         drm_modeset_unlock_all(dev);
 524
 525         kfree(intel_connector);
 526         DRM_DEBUG_KMS("\n");
 527 }
 528
 529 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 530 {
 531         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 532         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 533         struct drm_device *dev = intel_dig_port->base.base.dev;
 534
 535         drm_kms_helper_hotplug_event(dev);
 536 }
 537
 538 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 539         .add_connector = intel_dp_add_mst_connector,
 540         .register_connector = intel_dp_register_mst_connector,
 541         .destroy_connector = intel_dp_destroy_mst_connector,
 542         .hotplug = intel_dp_mst_hotplug,
 543 };
 544
 545 static struct intel_dp_mst_encoder *
 546 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 547 {
 548         struct intel_dp_mst_encoder *intel_mst;
 549         struct intel_encoder *intel_encoder;
 550         struct drm_device *dev = intel_dig_port->base.base.dev;
 551
 552         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 553
 554         if (!intel_mst)
 555                 return NULL;
 556
 557         intel_mst->pipe = pipe;
 558         intel_encoder = &intel_mst->base;
 559         intel_mst->primary = intel_dig_port;
 560
 561         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 562                          DRM_MODE_ENCODER_DPMST, NULL);
 563
 564         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 565         intel_encoder->crtc_mask = 0x7;
 566         intel_encoder->cloneable = 0;
 567
 568         intel_encoder->compute_config = intel_dp_mst_compute_config;
 569         intel_encoder->disable = intel_mst_disable_dp;
 570         intel_encoder->post_disable = intel_mst_post_disable_dp;
 571         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 572         intel_encoder->enable = intel_mst_enable_dp;
 573         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 574         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 575
 576         return intel_mst;
 577
 578 }
 579
 580 static bool
 581 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 582 {
 583         int i;
 584         struct intel_dp *intel_dp = &intel_dig_port->dp;
 585
 586         for (i = PIPE_A; i <= PIPE_C; i++)
 587                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 588         return true;
 589 }
 590
 591 int
 592 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 593 {
 594         struct intel_dp *intel_dp = &intel_dig_port->dp;
 595         struct drm_device *dev = intel_dig_port->base.base.dev;
 596         int ret;
 597
 598         intel_dp->can_mst = true;
 599         intel_dp->mst_mgr.cbs = &mst_cbs;
 600
 601         /* create encoders */
 602         intel_dp_create_fake_mst_encoders(intel_dig_port);
 603         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 604         if (ret) {
 605                 intel_dp->can_mst = false;
 606                 return ret;
 607         }
 608         return 0;
 609 }
 610
 611 void
 612 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 613 {
 614         struct intel_dp *intel_dp = &intel_dig_port->dp;
 615
 616         if (!intel_dp->can_mst)
 617                 return;
 618
 619         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 620         /* encoders will get killed by normal cleanup */
 621 }