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 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 intel_connector *connector =
  41                 to_intel_connector(conn_state->connector);
  42         struct drm_atomic_state *state = pipe_config->base.state;
  43         int bpp;
  44         int lane_count, slots;
  45         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  46         int mst_pbn;
  47         bool reduce_m_n = drm_dp_has_quirk(&intel_dp->desc,
  48                                            DP_DPCD_QUIRK_LIMITED_M_N);
  49
  50         pipe_config->has_pch_encoder = false;
  51         bpp = 24;
  52         if (intel_dp->compliance.test_data.bpc) {
  53                 bpp = intel_dp->compliance.test_data.bpc * 3;
  54                 DRM_DEBUG_KMS("Setting pipe bpp to %d\n",
  55                               bpp);
  56         }
  57         /*
  58          * for MST we always configure max link bw - the spec doesn't
  59          * seem to suggest we should do otherwise.
  60          */
  61         lane_count = intel_dp_max_lane_count(intel_dp);
  62
  63         pipe_config->lane_count = lane_count;
  64
  65         pipe_config->pipe_bpp = bpp;
  66
  67         pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
  68
  69         if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
  70                 pipe_config->has_audio = true;
  71
  72         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
  73         pipe_config->pbn = mst_pbn;
  74
  75         slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
  76                                               connector->port, mst_pbn);
  77         if (slots < 0) {
  78                 DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
  79                 return false;
  80         }
  81
  82         intel_link_compute_m_n(bpp, lane_count,
  83                                adjusted_mode->crtc_clock,
  84                                pipe_config->port_clock,
  85                                &pipe_config->dp_m_n,
  86                                reduce_m_n);
  87
  88         pipe_config->dp_m_n.tu = slots;
  89
  90         return true;
  91 }
  92
  93 static int intel_dp_mst_atomic_check(struct drm_connector *connector,
  94                 struct drm_connector_state *new_conn_state)
  95 {
  96         struct drm_atomic_state *state = new_conn_state->state;
  97         struct drm_connector_state *old_conn_state;
  98         struct drm_crtc *old_crtc;
  99         struct drm_crtc_state *crtc_state;
 100         int slots, ret = 0;
 101
 102         old_conn_state = drm_atomic_get_old_connector_state(state, connector);
 103         old_crtc = old_conn_state->crtc;
 104         if (!old_crtc)
 105                 return ret;
 106
 107         crtc_state = drm_atomic_get_new_crtc_state(state, old_crtc);
 108         slots = to_intel_crtc_state(crtc_state)->dp_m_n.tu;
 109         if (drm_atomic_crtc_needs_modeset(crtc_state) && slots > 0) {
 110                 struct drm_dp_mst_topology_mgr *mgr;
 111                 struct drm_encoder *old_encoder;
 112
 113                 old_encoder = old_conn_state->best_encoder;
 114                 mgr = &enc_to_mst(old_encoder)->primary->dp.mst_mgr;
 115
 116                 ret = drm_dp_atomic_release_vcpi_slots(state, mgr, slots);
 117                 if (ret)
 118                         DRM_DEBUG_KMS("failed releasing %d vcpi slots:%d\n", slots, ret);
 119                 else
 120                         to_intel_crtc_state(crtc_state)->dp_m_n.tu = 0;
 121         }
 122         return ret;
 123 }
 124
 125 static void intel_mst_disable_dp(struct intel_encoder *encoder,
 126                                  const struct intel_crtc_state *old_crtc_state,
 127                                  const struct drm_connector_state *old_conn_state)
 128 {
 129         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 130         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 131         struct intel_dp *intel_dp = &intel_dig_port->dp;
 132         struct intel_connector *connector =
 133                 to_intel_connector(old_conn_state->connector);
 134         int ret;
 135
 136         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 137
 138         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
 139
 140         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 141         if (ret) {
 142                 DRM_ERROR("failed to update payload %d\n", ret);
 143         }
 144         if (old_crtc_state->has_audio)
 145                 intel_audio_codec_disable(encoder);
 146 }
 147
 148 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 149                                       const struct intel_crtc_state *old_crtc_state,
 150                                       const struct drm_connector_state *old_conn_state)
 151 {
 152         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 153         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 154         struct intel_dp *intel_dp = &intel_dig_port->dp;
 155         struct intel_connector *connector =
 156                 to_intel_connector(old_conn_state->connector);
 157
 158         /* this can fail */
 159         drm_dp_check_act_status(&intel_dp->mst_mgr);
 160         /* and this can also fail */
 161         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 162
 163         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
 164
 165         /*
 166          * Power down mst path before disabling the port, otherwise we end
 167          * up getting interrupts from the sink upon detecting link loss.
 168          */
 169         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
 170                                      false);
 171
 172         intel_dp->active_mst_links--;
 173
 174         intel_mst->connector = NULL;
 175         if (intel_dp->active_mst_links == 0) {
 176                 intel_dig_port->base.post_disable(&intel_dig_port->base,
 177                                                   NULL, NULL);
 178         }
 179         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 180 }
 181
 182 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 183                                     const struct intel_crtc_state *pipe_config,
 184                                     const struct drm_connector_state *conn_state)
 185 {
 186         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 187         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 188         struct intel_dp *intel_dp = &intel_dig_port->dp;
 189         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 190         enum port port = intel_dig_port->port;
 191         struct intel_connector *connector =
 192                 to_intel_connector(conn_state->connector);
 193         int ret;
 194         uint32_t temp;
 195
 196         /* MST encoders are bound to a crtc, not to a connector,
 197          * force the mapping here for get_hw_state.
 198          */
 199         connector->encoder = encoder;
 200         intel_mst->connector = connector;
 201
 202         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 203
 204         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
 205         if (intel_dp->active_mst_links == 0)
 206                 intel_dig_port->base.pre_enable(&intel_dig_port->base,
 207                                                 pipe_config, NULL);
 208
 209         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 210                                        connector->port,
 211                                        pipe_config->pbn,
 212                                        pipe_config->dp_m_n.tu);
 213         if (ret == false) {
 214                 DRM_ERROR("failed to allocate vcpi\n");
 215                 return;
 216         }
 217
 218
 219         intel_dp->active_mst_links++;
 220         temp = I915_READ(DP_TP_STATUS(port));
 221         I915_WRITE(DP_TP_STATUS(port), temp);
 222
 223         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 224 }
 225
 226 static void intel_mst_enable_dp(struct intel_encoder *encoder,
 227                                 const struct intel_crtc_state *pipe_config,
 228                                 const struct drm_connector_state *conn_state)
 229 {
 230         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 231         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 232         struct intel_dp *intel_dp = &intel_dig_port->dp;
 233         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 234         enum port port = intel_dig_port->port;
 235         int ret;
 236
 237         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 238
 239         if (intel_wait_for_register(dev_priv,
 240                                     DP_TP_STATUS(port),
 241                                     DP_TP_STATUS_ACT_SENT,
 242                                     DP_TP_STATUS_ACT_SENT,
 243                                     1))
 244                 DRM_ERROR("Timed out waiting for ACT sent\n");
 245
 246         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 247
 248         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 249         if (pipe_config->has_audio)
 250                 intel_audio_codec_enable(encoder, pipe_config, conn_state);
 251 }
 252
 253 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 254                                       enum pipe *pipe)
 255 {
 256         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 257         *pipe = intel_mst->pipe;
 258         if (intel_mst->connector)
 259                 return true;
 260         return false;
 261 }
 262
 263 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 264                                         struct intel_crtc_state *pipe_config)
 265 {
 266         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 267         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 268         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 269         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 270         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 271         u32 temp, flags = 0;
 272
 273         pipe_config->has_audio =
 274                 intel_ddi_is_audio_enabled(dev_priv, crtc);
 275
 276         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 277         if (temp & TRANS_DDI_PHSYNC)
 278                 flags |= DRM_MODE_FLAG_PHSYNC;
 279         else
 280                 flags |= DRM_MODE_FLAG_NHSYNC;
 281         if (temp & TRANS_DDI_PVSYNC)
 282                 flags |= DRM_MODE_FLAG_PVSYNC;
 283         else
 284                 flags |= DRM_MODE_FLAG_NVSYNC;
 285
 286         switch (temp & TRANS_DDI_BPC_MASK) {
 287         case TRANS_DDI_BPC_6:
 288                 pipe_config->pipe_bpp = 18;
 289                 break;
 290         case TRANS_DDI_BPC_8:
 291                 pipe_config->pipe_bpp = 24;
 292                 break;
 293         case TRANS_DDI_BPC_10:
 294                 pipe_config->pipe_bpp = 30;
 295                 break;
 296         case TRANS_DDI_BPC_12:
 297                 pipe_config->pipe_bpp = 36;
 298                 break;
 299         default:
 300                 break;
 301         }
 302         pipe_config->base.adjusted_mode.flags |= flags;
 303
 304         pipe_config->lane_count =
 305                 ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
 306
 307         intel_dp_get_m_n(crtc, pipe_config);
 308
 309         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 310 }
 311
 312 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 313 {
 314         struct intel_connector *intel_connector = to_intel_connector(connector);
 315         struct intel_dp *intel_dp = intel_connector->mst_port;
 316         struct edid *edid;
 317         int ret;
 318
 319         if (!intel_dp) {
 320                 return intel_connector_update_modes(connector, NULL);
 321         }
 322
 323         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 324         ret = intel_connector_update_modes(connector, edid);
 325         kfree(edid);
 326
 327         return ret;
 328 }
 329
 330 static enum drm_connector_status
 331 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 332 {
 333         struct intel_connector *intel_connector = to_intel_connector(connector);
 334         struct intel_dp *intel_dp = intel_connector->mst_port;
 335
 336         if (!intel_dp)
 337                 return connector_status_disconnected;
 338         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 339 }
 340
 341 static void
 342 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 343 {
 344         struct intel_connector *intel_connector = to_intel_connector(connector);
 345
 346         if (!IS_ERR_OR_NULL(intel_connector->edid))
 347                 kfree(intel_connector->edid);
 348
 349         drm_connector_cleanup(connector);
 350         kfree(connector);
 351 }
 352
 353 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 354         .detect = intel_dp_mst_detect,
 355         .fill_modes = drm_helper_probe_single_connector_modes,
 356         .late_register = intel_connector_register,
 357         .early_unregister = intel_connector_unregister,
 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         struct intel_connector *intel_connector = to_intel_connector(connector);
 373         struct intel_dp *intel_dp = intel_connector->mst_port;
 374         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 375         int bpp = 24; /* MST uses fixed bpp */
 376         int max_rate, mode_rate, max_lanes, max_link_clock;
 377
 378         if (!intel_dp)
 379                 return MODE_ERROR;
 380
 381         max_link_clock = intel_dp_max_link_rate(intel_dp);
 382         max_lanes = intel_dp_max_lane_count(intel_dp);
 383
 384         max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 385         mode_rate = intel_dp_link_required(mode->clock, bpp);
 386
 387         /* TODO - validate mode against available PBN for link */
 388         if (mode->clock < 10000)
 389                 return MODE_CLOCK_LOW;
 390
 391         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 392                 return MODE_H_ILLEGAL;
 393
 394         if (mode_rate > max_rate || mode->clock > max_dotclk)
 395                 return MODE_CLOCK_HIGH;
 396
 397         return MODE_OK;
 398 }
 399
 400 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 401                                                          struct drm_connector_state *state)
 402 {
 403         struct intel_connector *intel_connector = to_intel_connector(connector);
 404         struct intel_dp *intel_dp = intel_connector->mst_port;
 405         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 406
 407         if (!intel_dp)
 408                 return NULL;
 409         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 410 }
 411
 412 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 413 {
 414         struct intel_connector *intel_connector = to_intel_connector(connector);
 415         struct intel_dp *intel_dp = intel_connector->mst_port;
 416         if (!intel_dp)
 417                 return NULL;
 418         return &intel_dp->mst_encoders[0]->base.base;
 419 }
 420
 421 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 422         .get_modes = intel_dp_mst_get_modes,
 423         .mode_valid = intel_dp_mst_mode_valid,
 424         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 425         .best_encoder = intel_mst_best_encoder,
 426         .atomic_check = intel_dp_mst_atomic_check,
 427 };
 428
 429 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 430 {
 431         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 432
 433         drm_encoder_cleanup(encoder);
 434         kfree(intel_mst);
 435 }
 436
 437 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 438         .destroy = intel_dp_mst_encoder_destroy,
 439 };
 440
 441 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 442 {
 443         if (connector->encoder && connector->base.state->crtc) {
 444                 enum pipe pipe;
 445                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 446                         return false;
 447                 return true;
 448         }
 449         return false;
 450 }
 451
 452 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)
 453 {
 454         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 455         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 456         struct drm_device *dev = intel_dig_port->base.base.dev;
 457         struct drm_i915_private *dev_priv = to_i915(dev);
 458         struct intel_connector *intel_connector;
 459         struct drm_connector *connector;
 460         enum pipe pipe;
 461         int ret;
 462
 463         intel_connector = intel_connector_alloc();
 464         if (!intel_connector)
 465                 return NULL;
 466
 467         connector = &intel_connector->base;
 468         ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
 469                                  DRM_MODE_CONNECTOR_DisplayPort);
 470         if (ret) {
 471                 intel_connector_free(intel_connector);
 472                 return NULL;
 473         }
 474
 475         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 476
 477         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 478         intel_connector->mst_port = intel_dp;
 479         intel_connector->port = port;
 480
 481         for_each_pipe(dev_priv, pipe) {
 482                 struct drm_encoder *enc =
 483                         &intel_dp->mst_encoders[pipe]->base.base;
 484
 485                 ret = drm_mode_connector_attach_encoder(&intel_connector->base,
 486                                                         enc);
 487                 if (ret)
 488                         goto err;
 489         }
 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         ret = drm_mode_connector_set_path_property(connector, pathprop);
 495         if (ret)
 496                 goto err;
 497
 498         return connector;
 499
 500 err:
 501         drm_connector_cleanup(connector);
 502         return NULL;
 503 }
 504
 505 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 506 {
 507         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 508
 509         if (dev_priv->fbdev)
 510                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 511                                                 connector);
 512
 513         drm_connector_register(connector);
 514 }
 515
 516 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 517                                            struct drm_connector *connector)
 518 {
 519         struct intel_connector *intel_connector = to_intel_connector(connector);
 520         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 521
 522         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name);
 523         drm_connector_unregister(connector);
 524
 525         if (dev_priv->fbdev)
 526                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 527                                                    connector);
 528         /* prevent race with the check in ->detect */
 529         drm_modeset_lock(&connector->dev->mode_config.connection_mutex, NULL);
 530         intel_connector->mst_port = NULL;
 531         drm_modeset_unlock(&connector->dev->mode_config.connection_mutex);
 532
 533         drm_connector_unreference(connector);
 534 }
 535
 536 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 537 {
 538         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 539         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 540         struct drm_device *dev = intel_dig_port->base.base.dev;
 541
 542         drm_kms_helper_hotplug_event(dev);
 543 }
 544
 545 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 546         .add_connector = intel_dp_add_mst_connector,
 547         .register_connector = intel_dp_register_mst_connector,
 548         .destroy_connector = intel_dp_destroy_mst_connector,
 549         .hotplug = intel_dp_mst_hotplug,
 550 };
 551
 552 static struct intel_dp_mst_encoder *
 553 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 554 {
 555         struct intel_dp_mst_encoder *intel_mst;
 556         struct intel_encoder *intel_encoder;
 557         struct drm_device *dev = intel_dig_port->base.base.dev;
 558
 559         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 560
 561         if (!intel_mst)
 562                 return NULL;
 563
 564         intel_mst->pipe = pipe;
 565         intel_encoder = &intel_mst->base;
 566         intel_mst->primary = intel_dig_port;
 567
 568         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 569                          DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
 570
 571         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 572         intel_encoder->power_domain = intel_dig_port->base.power_domain;
 573         intel_encoder->port = intel_dig_port->port;
 574         intel_encoder->crtc_mask = 0x7;
 575         intel_encoder->cloneable = 0;
 576
 577         intel_encoder->compute_config = intel_dp_mst_compute_config;
 578         intel_encoder->disable = intel_mst_disable_dp;
 579         intel_encoder->post_disable = intel_mst_post_disable_dp;
 580         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 581         intel_encoder->enable = intel_mst_enable_dp;
 582         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 583         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 584
 585         return intel_mst;
 586
 587 }
 588
 589 static bool
 590 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 591 {
 592         struct intel_dp *intel_dp = &intel_dig_port->dp;
 593         struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
 594         enum pipe pipe;
 595
 596         for_each_pipe(dev_priv, pipe)
 597                 intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(intel_dig_port, pipe);
 598         return true;
 599 }
 600
 601 int
 602 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 603 {
 604         struct intel_dp *intel_dp = &intel_dig_port->dp;
 605         struct drm_device *dev = intel_dig_port->base.base.dev;
 606         int ret;
 607
 608         intel_dp->can_mst = true;
 609         intel_dp->mst_mgr.cbs = &mst_cbs;
 610
 611         /* create encoders */
 612         intel_dp_create_fake_mst_encoders(intel_dig_port);
 613         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev,
 614                                            &intel_dp->aux, 16, 3, conn_base_id);
 615         if (ret) {
 616                 intel_dp->can_mst = false;
 617                 return ret;
 618         }
 619         return 0;
 620 }
 621
 622 void
 623 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 624 {
 625         struct intel_dp *intel_dp = &intel_dig_port->dp;
 626
 627         if (!intel_dp->can_mst)
 628                 return;
 629
 630         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 631         /* encoders will get killed by normal cleanup */
 632 }