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->connector->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->connector->port);
 138
 139         intel_dp->active_mst_links--;
 140
 141         intel_mst->connector = NULL;
 142         if (intel_dp->active_mst_links == 0) {
 143                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 144                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 145         }
 146 }
 147
 148 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 149 {
 150         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 151         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 152         struct intel_dp *intel_dp = &intel_dig_port->dp;
 153         struct drm_device *dev = encoder->base.dev;
 154         struct drm_i915_private *dev_priv = dev->dev_private;
 155         enum port port = intel_dig_port->port;
 156         int ret;
 157         uint32_t temp;
 158         struct intel_connector *found = NULL, *connector;
 159         int slots;
 160         struct drm_crtc *crtc = encoder->base.crtc;
 161         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 162
 163         for_each_intel_connector(dev, connector) {
 164                 if (connector->base.state->best_encoder == &encoder->base) {
 165                         found = connector;
 166                         break;
 167                 }
 168         }
 169
 170         if (!found) {
 171                 DRM_ERROR("can't find connector\n");
 172                 return;
 173         }
 174
 175         /* MST encoders are bound to a crtc, not to a connector,
 176          * force the mapping here for get_hw_state.
 177          */
 178         found->encoder = encoder;
 179
 180         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 181
 182         intel_mst->connector = found;
 183
 184         if (intel_dp->active_mst_links == 0) {
 185                 intel_prepare_ddi_buffer(&intel_dig_port->base);
 186
 187                 intel_ddi_clk_select(&intel_dig_port->base, 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->connector->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->connector)
 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         if (!intel_dp) {
 314                 return intel_connector_update_modes(connector, NULL);
 315         }
 316
 317         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 318         ret = intel_connector_update_modes(connector, edid);
 319         kfree(edid);
 320
 321         return ret;
 322 }
 323
 324 static enum drm_connector_status
 325 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 326 {
 327         struct intel_connector *intel_connector = to_intel_connector(connector);
 328         struct intel_dp *intel_dp = intel_connector->mst_port;
 329
 330         if (!intel_dp)
 331                 return connector_status_disconnected;
 332         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 333 }
 334
 335 static int
 336 intel_dp_mst_set_property(struct drm_connector *connector,
 337                           struct drm_property *property,
 338                           uint64_t val)
 339 {
 340         return 0;
 341 }
 342
 343 static void
 344 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 345 {
 346         struct intel_connector *intel_connector = to_intel_connector(connector);
 347
 348         if (!IS_ERR_OR_NULL(intel_connector->edid))
 349                 kfree(intel_connector->edid);
 350
 351         drm_connector_cleanup(connector);
 352         kfree(connector);
 353 }
 354
 355 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 356         .dpms = drm_atomic_helper_connector_dpms,
 357         .detect = intel_dp_mst_detect,
 358         .fill_modes = drm_helper_probe_single_connector_modes,
 359         .set_property = intel_dp_mst_set_property,
 360         .atomic_get_property = intel_connector_atomic_get_property,
 361         .destroy = intel_dp_mst_connector_destroy,
 362         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 363         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 364 };
 365
 366 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 367 {
 368         return intel_dp_mst_get_ddc_modes(connector);
 369 }
 370
 371 static enum drm_mode_status
 372 intel_dp_mst_mode_valid(struct drm_connector *connector,
 373                         struct drm_display_mode *mode)
 374 {
 375         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 376
 377         /* TODO - validate mode against available PBN for link */
 378         if (mode->clock < 10000)
 379                 return MODE_CLOCK_LOW;
 380
 381         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 382                 return MODE_H_ILLEGAL;
 383
 384         if (mode->clock > max_dotclk)
 385                 return MODE_CLOCK_HIGH;
 386
 387         return MODE_OK;
 388 }
 389
 390 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 391                                                          struct drm_connector_state *state)
 392 {
 393         struct intel_connector *intel_connector = to_intel_connector(connector);
 394         struct intel_dp *intel_dp = intel_connector->mst_port;
 395         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 396
 397         if (!intel_dp)
 398                 return NULL;
 399         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 400 }
 401
 402 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 403 {
 404         struct intel_connector *intel_connector = to_intel_connector(connector);
 405         struct intel_dp *intel_dp = intel_connector->mst_port;
 406         if (!intel_dp)
 407                 return NULL;
 408         return &intel_dp->mst_encoders[0]->base.base;
 409 }
 410
 411 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 412         .get_modes = intel_dp_mst_get_modes,
 413         .mode_valid = intel_dp_mst_mode_valid,
 414         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 415         .best_encoder = intel_mst_best_encoder,
 416 };
 417
 418 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 419 {
 420         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 421
 422         drm_encoder_cleanup(encoder);
 423         kfree(intel_mst);
 424 }
 425
 426 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 427         .destroy = intel_dp_mst_encoder_destroy,
 428 };
 429
 430 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 431 {
 432         if (connector->encoder && connector->base.state->crtc) {
 433                 enum pipe pipe;
 434                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 435                         return false;
 436                 return true;
 437         }
 438         return false;
 439 }
 440
 441 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 442 {
 443 #ifdef CONFIG_DRM_FBDEV_EMULATION
 444         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 445
 446         if (dev_priv->fbdev)
 447                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 448                                                 &connector->base);
 449 #endif
 450 }
 451
 452 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 453 {
 454 #ifdef CONFIG_DRM_FBDEV_EMULATION
 455         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 456
 457         if (dev_priv->fbdev)
 458                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 459                                                    &connector->base);
 460 #endif
 461 }
 462
 463 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)
 464 {
 465         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 466         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 467         struct drm_device *dev = intel_dig_port->base.base.dev;
 468         struct intel_connector *intel_connector;
 469         struct drm_connector *connector;
 470         int i;
 471
 472         intel_connector = intel_connector_alloc();
 473         if (!intel_connector)
 474                 return NULL;
 475
 476         connector = &intel_connector->base;
 477         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 478         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 479
 480         intel_connector->unregister = intel_connector_unregister;
 481         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 482         intel_connector->mst_port = intel_dp;
 483         intel_connector->port = port;
 484
 485         for (i = PIPE_A; i <= PIPE_C; i++) {
 486                 drm_mode_connector_attach_encoder(&intel_connector->base,
 487                                                   &intel_dp->mst_encoders[i]->base.base);
 488         }
 489         intel_dp_add_properties(intel_dp, connector);
 490
 491         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 492         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 493
 494         drm_mode_connector_set_path_property(connector, pathprop);
 495         return connector;
 496 }
 497
 498 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 499 {
 500         struct intel_connector *intel_connector = to_intel_connector(connector);
 501         struct drm_device *dev = connector->dev;
 502         drm_modeset_lock_all(dev);
 503         intel_connector_add_to_fbdev(intel_connector);
 504         drm_modeset_unlock_all(dev);
 505         drm_connector_register(&intel_connector->base);
 506 }
 507
 508 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 509                                            struct drm_connector *connector)
 510 {
 511         struct intel_connector *intel_connector = to_intel_connector(connector);
 512         struct drm_device *dev = connector->dev;
 513
 514         intel_connector->unregister(intel_connector);
 515
 516         /* need to nuke the connector */
 517         drm_modeset_lock_all(dev);
 518         intel_connector_remove_from_fbdev(intel_connector);
 519         intel_connector->mst_port = NULL;
 520         drm_modeset_unlock_all(dev);
 521
 522         drm_connector_unreference(&intel_connector->base);
 523         DRM_DEBUG_KMS("\n");
 524 }
 525
 526 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 527 {
 528         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 529         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 530         struct drm_device *dev = intel_dig_port->base.base.dev;
 531
 532         drm_kms_helper_hotplug_event(dev);
 533 }
 534
 535 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 536         .add_connector = intel_dp_add_mst_connector,
 537         .register_connector = intel_dp_register_mst_connector,
 538         .destroy_connector = intel_dp_destroy_mst_connector,
 539         .hotplug = intel_dp_mst_hotplug,
 540 };
 541
 542 static struct intel_dp_mst_encoder *
 543 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 544 {
 545         struct intel_dp_mst_encoder *intel_mst;
 546         struct intel_encoder *intel_encoder;
 547         struct drm_device *dev = intel_dig_port->base.base.dev;
 548
 549         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 550
 551         if (!intel_mst)
 552                 return NULL;
 553
 554         intel_mst->pipe = pipe;
 555         intel_encoder = &intel_mst->base;
 556         intel_mst->primary = intel_dig_port;
 557
 558         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 559                          DRM_MODE_ENCODER_DPMST, NULL);
 560
 561         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 562         intel_encoder->crtc_mask = 0x7;
 563         intel_encoder->cloneable = 0;
 564
 565         intel_encoder->compute_config = intel_dp_mst_compute_config;
 566         intel_encoder->disable = intel_mst_disable_dp;
 567         intel_encoder->post_disable = intel_mst_post_disable_dp;
 568         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 569         intel_encoder->enable = intel_mst_enable_dp;
 570         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 571         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 572
 573         return intel_mst;
 574
 575 }
 576
 577 static bool
 578 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 579 {
 580         int i;
 581         struct intel_dp *intel_dp = &intel_dig_port->dp;
 582
 583         for (i = PIPE_A; i <= PIPE_C; i++)
 584                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 585         return true;
 586 }
 587
 588 int
 589 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 590 {
 591         struct intel_dp *intel_dp = &intel_dig_port->dp;
 592         struct drm_device *dev = intel_dig_port->base.base.dev;
 593         int ret;
 594
 595         intel_dp->can_mst = true;
 596         intel_dp->mst_mgr.cbs = &mst_cbs;
 597
 598         /* create encoders */
 599         intel_dp_create_fake_mst_encoders(intel_dig_port);
 600         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 601         if (ret) {
 602                 intel_dp->can_mst = false;
 603                 return ret;
 604         }
 605         return 0;
 606 }
 607
 608 void
 609 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 610 {
 611         struct intel_dp *intel_dp = &intel_dig_port->dp;
 612
 613         if (!intel_dp->can_mst)
 614                 return;
 615
 616         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 617         /* encoders will get killed by normal cleanup */
 618 }