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                                         struct drm_connector_state *conn_state)
  36 {
  37         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
  38         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  39         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  40         struct intel_dp *intel_dp = &intel_dig_port->dp;
  41         struct intel_connector *connector =
  42                 to_intel_connector(conn_state->connector);
  43         struct drm_atomic_state *state = pipe_config->base.state;
  44         int bpp;
  45         int lane_count, slots;
  46         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  47         int mst_pbn;
  48         bool reduce_m_n = drm_dp_has_quirk(&intel_dp->desc,
  49                                            DP_DPCD_QUIRK_LIMITED_M_N);
  50
  51         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
  52                 return false;
  53
  54         pipe_config->has_pch_encoder = false;
  55         bpp = 24;
  56         if (intel_dp->compliance.test_data.bpc) {
  57                 bpp = intel_dp->compliance.test_data.bpc * 3;
  58                 DRM_DEBUG_KMS("Setting pipe bpp to %d\n",
  59                               bpp);
  60         }
  61         /*
  62          * for MST we always configure max link bw - the spec doesn't
  63          * seem to suggest we should do otherwise.
  64          */
  65         lane_count = intel_dp_max_lane_count(intel_dp);
  66
  67         pipe_config->lane_count = lane_count;
  68
  69         pipe_config->pipe_bpp = bpp;
  70
  71         pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
  72
  73         if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
  74                 pipe_config->has_audio = true;
  75
  76         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
  77         pipe_config->pbn = mst_pbn;
  78
  79         slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
  80                                               connector->port, mst_pbn);
  81         if (slots < 0) {
  82                 DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
  83                 return false;
  84         }
  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                                reduce_m_n);
  91
  92         pipe_config->dp_m_n.tu = slots;
  93
  94         if (IS_GEN9_LP(dev_priv))
  95                 pipe_config->lane_lat_optim_mask =
  96                         bxt_ddi_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
  97
  98         intel_ddi_compute_min_voltage_level(dev_priv, pipe_config);
  99
 100         return true;
 101 }
 102
 103 static int intel_dp_mst_atomic_check(struct drm_connector *connector,
 104                 struct drm_connector_state *new_conn_state)
 105 {
 106         struct drm_atomic_state *state = new_conn_state->state;
 107         struct drm_connector_state *old_conn_state;
 108         struct drm_crtc *old_crtc;
 109         struct drm_crtc_state *crtc_state;
 110         int slots, ret = 0;
 111
 112         old_conn_state = drm_atomic_get_old_connector_state(state, connector);
 113         old_crtc = old_conn_state->crtc;
 114         if (!old_crtc)
 115                 return ret;
 116
 117         crtc_state = drm_atomic_get_new_crtc_state(state, old_crtc);
 118         slots = to_intel_crtc_state(crtc_state)->dp_m_n.tu;
 119         if (drm_atomic_crtc_needs_modeset(crtc_state) && slots > 0) {
 120                 struct drm_dp_mst_topology_mgr *mgr;
 121                 struct drm_encoder *old_encoder;
 122
 123                 old_encoder = old_conn_state->best_encoder;
 124                 mgr = &enc_to_mst(old_encoder)->primary->dp.mst_mgr;
 125
 126                 ret = drm_dp_atomic_release_vcpi_slots(state, mgr, slots);
 127                 if (ret)
 128                         DRM_DEBUG_KMS("failed releasing %d vcpi slots:%d\n", slots, ret);
 129                 else
 130                         to_intel_crtc_state(crtc_state)->dp_m_n.tu = 0;
 131         }
 132         return ret;
 133 }
 134
 135 static void intel_mst_disable_dp(struct intel_encoder *encoder,
 136                                  const struct intel_crtc_state *old_crtc_state,
 137                                  const struct drm_connector_state *old_conn_state)
 138 {
 139         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 140         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 141         struct intel_dp *intel_dp = &intel_dig_port->dp;
 142         struct intel_connector *connector =
 143                 to_intel_connector(old_conn_state->connector);
 144         int ret;
 145
 146         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 147
 148         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
 149
 150         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 151         if (ret) {
 152                 DRM_ERROR("failed to update payload %d\n", ret);
 153         }
 154         if (old_crtc_state->has_audio)
 155                 intel_audio_codec_disable(encoder,
 156                                           old_crtc_state, old_conn_state);
 157 }
 158
 159 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 160                                       const struct intel_crtc_state *old_crtc_state,
 161                                       const struct drm_connector_state *old_conn_state)
 162 {
 163         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 164         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 165         struct intel_dp *intel_dp = &intel_dig_port->dp;
 166         struct intel_connector *connector =
 167                 to_intel_connector(old_conn_state->connector);
 168
 169         /* this can fail */
 170         drm_dp_check_act_status(&intel_dp->mst_mgr);
 171         /* and this can also fail */
 172         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 173
 174         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
 175
 176         /*
 177          * Power down mst path before disabling the port, otherwise we end
 178          * up getting interrupts from the sink upon detecting link loss.
 179          */
 180         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
 181                                      false);
 182
 183         intel_dp->active_mst_links--;
 184
 185         intel_mst->connector = NULL;
 186         if (intel_dp->active_mst_links == 0) {
 187                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 188                 intel_dig_port->base.post_disable(&intel_dig_port->base,
 189                                                   old_crtc_state, NULL);
 190         }
 191
 192         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 193 }
 194
 195 static void intel_mst_pre_pll_enable_dp(struct intel_encoder *encoder,
 196                                         const struct intel_crtc_state *pipe_config,
 197                                         const struct drm_connector_state *conn_state)
 198 {
 199         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 200         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 201         struct intel_dp *intel_dp = &intel_dig_port->dp;
 202
 203         if (intel_dp->active_mst_links == 0 &&
 204             intel_dig_port->base.pre_pll_enable)
 205                 intel_dig_port->base.pre_pll_enable(&intel_dig_port->base,
 206                                                     pipe_config, NULL);
 207 }
 208
 209 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 210                                     const struct intel_crtc_state *pipe_config,
 211                                     const struct drm_connector_state *conn_state)
 212 {
 213         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 214         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 215         struct intel_dp *intel_dp = &intel_dig_port->dp;
 216         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 217         enum port port = intel_dig_port->base.port;
 218         struct intel_connector *connector =
 219                 to_intel_connector(conn_state->connector);
 220         int ret;
 221         uint32_t temp;
 222
 223         /* MST encoders are bound to a crtc, not to a connector,
 224          * force the mapping here for get_hw_state.
 225          */
 226         connector->encoder = encoder;
 227         intel_mst->connector = connector;
 228
 229         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 230
 231         if (intel_dp->active_mst_links == 0)
 232                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 233
 234         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
 235
 236         if (intel_dp->active_mst_links == 0)
 237                 intel_dig_port->base.pre_enable(&intel_dig_port->base,
 238                                                 pipe_config, NULL);
 239
 240         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 241                                        connector->port,
 242                                        pipe_config->pbn,
 243                                        pipe_config->dp_m_n.tu);
 244         if (ret == false) {
 245                 DRM_ERROR("failed to allocate vcpi\n");
 246                 return;
 247         }
 248
 249
 250         intel_dp->active_mst_links++;
 251         temp = I915_READ(DP_TP_STATUS(port));
 252         I915_WRITE(DP_TP_STATUS(port), temp);
 253
 254         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 255 }
 256
 257 static void intel_mst_enable_dp(struct intel_encoder *encoder,
 258                                 const struct intel_crtc_state *pipe_config,
 259                                 const struct drm_connector_state *conn_state)
 260 {
 261         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 262         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 263         struct intel_dp *intel_dp = &intel_dig_port->dp;
 264         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 265         enum port port = intel_dig_port->base.port;
 266         int ret;
 267
 268         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 269
 270         if (intel_wait_for_register(dev_priv,
 271                                     DP_TP_STATUS(port),
 272                                     DP_TP_STATUS_ACT_SENT,
 273                                     DP_TP_STATUS_ACT_SENT,
 274                                     1))
 275                 DRM_ERROR("Timed out waiting for ACT sent\n");
 276
 277         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 278
 279         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 280         if (pipe_config->has_audio)
 281                 intel_audio_codec_enable(encoder, pipe_config, conn_state);
 282 }
 283
 284 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 285                                       enum pipe *pipe)
 286 {
 287         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 288         *pipe = intel_mst->pipe;
 289         if (intel_mst->connector)
 290                 return true;
 291         return false;
 292 }
 293
 294 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 295                                         struct intel_crtc_state *pipe_config)
 296 {
 297         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 298         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 299
 300         intel_ddi_get_config(&intel_dig_port->base, pipe_config);
 301 }
 302
 303 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 304 {
 305         struct intel_connector *intel_connector = to_intel_connector(connector);
 306         struct intel_dp *intel_dp = intel_connector->mst_port;
 307         struct edid *edid;
 308         int ret;
 309
 310         if (!intel_dp) {
 311                 return intel_connector_update_modes(connector, NULL);
 312         }
 313
 314         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 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         if (!intel_dp)
 328                 return connector_status_disconnected;
 329         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 330 }
 331
 332 static void
 333 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 334 {
 335         struct intel_connector *intel_connector = to_intel_connector(connector);
 336
 337         if (!IS_ERR_OR_NULL(intel_connector->edid))
 338                 kfree(intel_connector->edid);
 339
 340         drm_connector_cleanup(connector);
 341         kfree(connector);
 342 }
 343
 344 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 345         .detect = intel_dp_mst_detect,
 346         .fill_modes = drm_helper_probe_single_connector_modes,
 347         .late_register = intel_connector_register,
 348         .early_unregister = intel_connector_unregister,
 349         .destroy = intel_dp_mst_connector_destroy,
 350         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 351         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 352 };
 353
 354 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 355 {
 356         return intel_dp_mst_get_ddc_modes(connector);
 357 }
 358
 359 static enum drm_mode_status
 360 intel_dp_mst_mode_valid(struct drm_connector *connector,
 361                         struct drm_display_mode *mode)
 362 {
 363         struct intel_connector *intel_connector = to_intel_connector(connector);
 364         struct intel_dp *intel_dp = intel_connector->mst_port;
 365         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 366         int bpp = 24; /* MST uses fixed bpp */
 367         int max_rate, mode_rate, max_lanes, max_link_clock;
 368
 369         if (!intel_dp)
 370                 return MODE_ERROR;
 371
 372         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 373                 return MODE_NO_DBLESCAN;
 374
 375         max_link_clock = intel_dp_max_link_rate(intel_dp);
 376         max_lanes = intel_dp_max_lane_count(intel_dp);
 377
 378         max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 379         mode_rate = intel_dp_link_required(mode->clock, bpp);
 380
 381         /* TODO - validate mode against available PBN for link */
 382         if (mode->clock < 10000)
 383                 return MODE_CLOCK_LOW;
 384
 385         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 386                 return MODE_H_ILLEGAL;
 387
 388         if (mode_rate > max_rate || mode->clock > max_dotclk)
 389                 return MODE_CLOCK_HIGH;
 390
 391         return MODE_OK;
 392 }
 393
 394 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 395                                                          struct drm_connector_state *state)
 396 {
 397         struct intel_connector *intel_connector = to_intel_connector(connector);
 398         struct intel_dp *intel_dp = intel_connector->mst_port;
 399         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 400
 401         if (!intel_dp)
 402                 return NULL;
 403         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 404 }
 405
 406 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 407 {
 408         struct intel_connector *intel_connector = to_intel_connector(connector);
 409         struct intel_dp *intel_dp = intel_connector->mst_port;
 410         if (!intel_dp)
 411                 return NULL;
 412         return &intel_dp->mst_encoders[0]->base.base;
 413 }
 414
 415 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 416         .get_modes = intel_dp_mst_get_modes,
 417         .mode_valid = intel_dp_mst_mode_valid,
 418         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 419         .best_encoder = intel_mst_best_encoder,
 420         .atomic_check = intel_dp_mst_atomic_check,
 421 };
 422
 423 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 424 {
 425         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 426
 427         drm_encoder_cleanup(encoder);
 428         kfree(intel_mst);
 429 }
 430
 431 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 432         .destroy = intel_dp_mst_encoder_destroy,
 433 };
 434
 435 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 436 {
 437         if (connector->encoder && connector->base.state->crtc) {
 438                 enum pipe pipe;
 439                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 440                         return false;
 441                 return true;
 442         }
 443         return false;
 444 }
 445
 446 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)
 447 {
 448         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 449         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 450         struct drm_device *dev = intel_dig_port->base.base.dev;
 451         struct drm_i915_private *dev_priv = to_i915(dev);
 452         struct intel_connector *intel_connector;
 453         struct drm_connector *connector;
 454         enum pipe pipe;
 455         int ret;
 456
 457         intel_connector = intel_connector_alloc();
 458         if (!intel_connector)
 459                 return NULL;
 460
 461         connector = &intel_connector->base;
 462         ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
 463                                  DRM_MODE_CONNECTOR_DisplayPort);
 464         if (ret) {
 465                 intel_connector_free(intel_connector);
 466                 return NULL;
 467         }
 468
 469         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 470
 471         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 472         intel_connector->mst_port = intel_dp;
 473         intel_connector->port = port;
 474
 475         for_each_pipe(dev_priv, pipe) {
 476                 struct drm_encoder *enc =
 477                         &intel_dp->mst_encoders[pipe]->base.base;
 478
 479                 ret = drm_mode_connector_attach_encoder(&intel_connector->base,
 480                                                         enc);
 481                 if (ret)
 482                         goto err;
 483         }
 484
 485         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 486         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 487
 488         ret = drm_mode_connector_set_path_property(connector, pathprop);
 489         if (ret)
 490                 goto err;
 491
 492         return connector;
 493
 494 err:
 495         drm_connector_cleanup(connector);
 496         return NULL;
 497 }
 498
 499 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 500 {
 501         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 502
 503         if (dev_priv->fbdev)
 504                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 505                                                 connector);
 506
 507         drm_connector_register(connector);
 508 }
 509
 510 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 511                                            struct drm_connector *connector)
 512 {
 513         struct intel_connector *intel_connector = to_intel_connector(connector);
 514         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 515
 516         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name);
 517         drm_connector_unregister(connector);
 518
 519         if (dev_priv->fbdev)
 520                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 521                                                    connector);
 522         /* prevent race with the check in ->detect */
 523         drm_modeset_lock(&connector->dev->mode_config.connection_mutex, NULL);
 524         intel_connector->mst_port = NULL;
 525         drm_modeset_unlock(&connector->dev->mode_config.connection_mutex);
 526
 527         drm_connector_unreference(connector);
 528 }
 529
 530 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 531 {
 532         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 533         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 534         struct drm_device *dev = intel_dig_port->base.base.dev;
 535
 536         drm_kms_helper_hotplug_event(dev);
 537 }
 538
 539 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 540         .add_connector = intel_dp_add_mst_connector,
 541         .register_connector = intel_dp_register_mst_connector,
 542         .destroy_connector = intel_dp_destroy_mst_connector,
 543         .hotplug = intel_dp_mst_hotplug,
 544 };
 545
 546 static struct intel_dp_mst_encoder *
 547 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 548 {
 549         struct intel_dp_mst_encoder *intel_mst;
 550         struct intel_encoder *intel_encoder;
 551         struct drm_device *dev = intel_dig_port->base.base.dev;
 552
 553         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 554
 555         if (!intel_mst)
 556                 return NULL;
 557
 558         intel_mst->pipe = pipe;
 559         intel_encoder = &intel_mst->base;
 560         intel_mst->primary = intel_dig_port;
 561
 562         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 563                          DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
 564
 565         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 566         intel_encoder->power_domain = intel_dig_port->base.power_domain;
 567         intel_encoder->port = intel_dig_port->base.port;
 568         intel_encoder->crtc_mask = 0x7;
 569         intel_encoder->cloneable = 0;
 570
 571         intel_encoder->compute_config = intel_dp_mst_compute_config;
 572         intel_encoder->disable = intel_mst_disable_dp;
 573         intel_encoder->post_disable = intel_mst_post_disable_dp;
 574         intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
 575         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 576         intel_encoder->enable = intel_mst_enable_dp;
 577         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 578         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 579
 580         return intel_mst;
 581
 582 }
 583
 584 static bool
 585 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 586 {
 587         struct intel_dp *intel_dp = &intel_dig_port->dp;
 588         struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
 589         enum pipe pipe;
 590
 591         for_each_pipe(dev_priv, pipe)
 592                 intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(intel_dig_port, pipe);
 593         return true;
 594 }
 595
 596 int
 597 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 598 {
 599         struct intel_dp *intel_dp = &intel_dig_port->dp;
 600         struct drm_device *dev = intel_dig_port->base.base.dev;
 601         int ret;
 602
 603         intel_dp->can_mst = true;
 604         intel_dp->mst_mgr.cbs = &mst_cbs;
 605
 606         /* create encoders */
 607         intel_dp_create_fake_mst_encoders(intel_dig_port);
 608         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev,
 609                                            &intel_dp->aux, 16, 3, conn_base_id);
 610         if (ret) {
 611                 intel_dp->can_mst = false;
 612                 return ret;
 613         }
 614         return 0;
 615 }
 616
 617 void
 618 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 619 {
 620         struct intel_dp *intel_dp = &intel_dig_port->dp;
 621
 622         if (!intel_dp->can_mst)
 623                 return;
 624
 625         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 626         /* encoders will get killed by normal cleanup */
 627 }