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;
  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
  48         pipe_config->has_pch_encoder = false;
  49         bpp = 24;
  50         if (intel_dp->compliance.test_data.bpc) {
  51                 bpp = intel_dp->compliance.test_data.bpc * 3;
  52                 DRM_DEBUG_KMS("Setting pipe bpp to %d\n",
  53                               bpp);
  54         }
  55         /*
  56          * for MST we always configure max link bw - the spec doesn't
  57          * seem to suggest we should do otherwise.
  58          */
  59         lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
  60
  61         pipe_config->lane_count = lane_count;
  62
  63         pipe_config->pipe_bpp = bpp;
  64         pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
  65
  66         state = pipe_config->base.state;
  67
  68         if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
  69                 pipe_config->has_audio = true;
  70         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
  71
  72         pipe_config->pbn = mst_pbn;
  73         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  74
  75         intel_link_compute_m_n(bpp, lane_count,
  76                                adjusted_mode->crtc_clock,
  77                                pipe_config->port_clock,
  78                                &pipe_config->dp_m_n);
  79
  80         pipe_config->dp_m_n.tu = slots;
  81
  82         return true;
  83
  84 }
  85
  86 static void intel_mst_disable_dp(struct intel_encoder *encoder,
  87                                  struct intel_crtc_state *old_crtc_state,
  88                                  struct drm_connector_state *old_conn_state)
  89 {
  90         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  91         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  92         struct intel_dp *intel_dp = &intel_dig_port->dp;
  93         struct intel_connector *connector =
  94                 to_intel_connector(old_conn_state->connector);
  95         int ret;
  96
  97         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
  98
  99         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
 100
 101         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 102         if (ret) {
 103                 DRM_ERROR("failed to update payload %d\n", ret);
 104         }
 105         if (old_crtc_state->has_audio)
 106                 intel_audio_codec_disable(encoder);
 107 }
 108
 109 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 110                                       struct intel_crtc_state *old_crtc_state,
 111                                       struct drm_connector_state *old_conn_state)
 112 {
 113         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 114         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 115         struct intel_dp *intel_dp = &intel_dig_port->dp;
 116         struct intel_connector *connector =
 117                 to_intel_connector(old_conn_state->connector);
 118
 119         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 120
 121         /* this can fail */
 122         drm_dp_check_act_status(&intel_dp->mst_mgr);
 123         /* and this can also fail */
 124         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 125
 126         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
 127
 128         intel_dp->active_mst_links--;
 129
 130         intel_mst->connector = NULL;
 131         if (intel_dp->active_mst_links == 0) {
 132                 intel_dig_port->base.post_disable(&intel_dig_port->base,
 133                                                   NULL, NULL);
 134
 135                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 136         }
 137 }
 138
 139 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 140                                     struct intel_crtc_state *pipe_config,
 141                                     struct drm_connector_state *conn_state)
 142 {
 143         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 144         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 145         struct intel_dp *intel_dp = &intel_dig_port->dp;
 146         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 147         enum port port = intel_dig_port->port;
 148         struct intel_connector *connector =
 149                 to_intel_connector(conn_state->connector);
 150         int ret;
 151         uint32_t temp;
 152         int slots;
 153
 154         /* MST encoders are bound to a crtc, not to a connector,
 155          * force the mapping here for get_hw_state.
 156          */
 157         connector->encoder = encoder;
 158         intel_mst->connector = connector;
 159
 160         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 161
 162         if (intel_dp->active_mst_links == 0) {
 163                 intel_ddi_clk_select(&intel_dig_port->base,
 164                                      pipe_config->shared_dpll);
 165
 166                 intel_prepare_dp_ddi_buffers(&intel_dig_port->base);
 167                 intel_dp_set_link_params(intel_dp,
 168                                          pipe_config->port_clock,
 169                                          pipe_config->lane_count,
 170                                          true);
 171
 172                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 173
 174                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 175
 176                 intel_dp_start_link_train(intel_dp);
 177                 intel_dp_stop_link_train(intel_dp);
 178         }
 179
 180         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 181                                        connector->port,
 182                                        pipe_config->pbn, &slots);
 183         if (ret == false) {
 184                 DRM_ERROR("failed to allocate vcpi\n");
 185                 return;
 186         }
 187
 188
 189         intel_dp->active_mst_links++;
 190         temp = I915_READ(DP_TP_STATUS(port));
 191         I915_WRITE(DP_TP_STATUS(port), temp);
 192
 193         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 194 }
 195
 196 static void intel_mst_enable_dp(struct intel_encoder *encoder,
 197                                 struct intel_crtc_state *pipe_config,
 198                                 struct drm_connector_state *conn_state)
 199 {
 200         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 201         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 202         struct intel_dp *intel_dp = &intel_dig_port->dp;
 203         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 204         enum port port = intel_dig_port->port;
 205         int ret;
 206
 207         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 208
 209         if (intel_wait_for_register(dev_priv,
 210                                     DP_TP_STATUS(port),
 211                                     DP_TP_STATUS_ACT_SENT,
 212                                     DP_TP_STATUS_ACT_SENT,
 213                                     1))
 214                 DRM_ERROR("Timed out waiting for ACT sent\n");
 215
 216         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 217
 218         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 219         if (pipe_config->has_audio)
 220                 intel_audio_codec_enable(encoder, pipe_config, conn_state);
 221 }
 222
 223 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 224                                       enum pipe *pipe)
 225 {
 226         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 227         *pipe = intel_mst->pipe;
 228         if (intel_mst->connector)
 229                 return true;
 230         return false;
 231 }
 232
 233 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 234                                         struct intel_crtc_state *pipe_config)
 235 {
 236         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 237         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 238         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 239         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 240         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 241         u32 temp, flags = 0;
 242
 243         pipe_config->has_audio =
 244                 intel_ddi_is_audio_enabled(dev_priv, crtc);
 245
 246         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 247         if (temp & TRANS_DDI_PHSYNC)
 248                 flags |= DRM_MODE_FLAG_PHSYNC;
 249         else
 250                 flags |= DRM_MODE_FLAG_NHSYNC;
 251         if (temp & TRANS_DDI_PVSYNC)
 252                 flags |= DRM_MODE_FLAG_PVSYNC;
 253         else
 254                 flags |= DRM_MODE_FLAG_NVSYNC;
 255
 256         switch (temp & TRANS_DDI_BPC_MASK) {
 257         case TRANS_DDI_BPC_6:
 258                 pipe_config->pipe_bpp = 18;
 259                 break;
 260         case TRANS_DDI_BPC_8:
 261                 pipe_config->pipe_bpp = 24;
 262                 break;
 263         case TRANS_DDI_BPC_10:
 264                 pipe_config->pipe_bpp = 30;
 265                 break;
 266         case TRANS_DDI_BPC_12:
 267                 pipe_config->pipe_bpp = 36;
 268                 break;
 269         default:
 270                 break;
 271         }
 272         pipe_config->base.adjusted_mode.flags |= flags;
 273
 274         pipe_config->lane_count =
 275                 ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
 276
 277         intel_dp_get_m_n(crtc, pipe_config);
 278
 279         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 280 }
 281
 282 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 283 {
 284         struct intel_connector *intel_connector = to_intel_connector(connector);
 285         struct intel_dp *intel_dp = intel_connector->mst_port;
 286         struct edid *edid;
 287         int ret;
 288
 289         if (!intel_dp) {
 290                 return intel_connector_update_modes(connector, NULL);
 291         }
 292
 293         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 294         ret = intel_connector_update_modes(connector, edid);
 295         kfree(edid);
 296
 297         return ret;
 298 }
 299
 300 static enum drm_connector_status
 301 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 302 {
 303         struct intel_connector *intel_connector = to_intel_connector(connector);
 304         struct intel_dp *intel_dp = intel_connector->mst_port;
 305
 306         if (!intel_dp)
 307                 return connector_status_disconnected;
 308         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 309 }
 310
 311 static int
 312 intel_dp_mst_set_property(struct drm_connector *connector,
 313                           struct drm_property *property,
 314                           uint64_t val)
 315 {
 316         return 0;
 317 }
 318
 319 static void
 320 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 321 {
 322         struct intel_connector *intel_connector = to_intel_connector(connector);
 323
 324         if (!IS_ERR_OR_NULL(intel_connector->edid))
 325                 kfree(intel_connector->edid);
 326
 327         drm_connector_cleanup(connector);
 328         kfree(connector);
 329 }
 330
 331 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 332         .dpms = drm_atomic_helper_connector_dpms,
 333         .detect = intel_dp_mst_detect,
 334         .fill_modes = drm_helper_probe_single_connector_modes,
 335         .set_property = intel_dp_mst_set_property,
 336         .atomic_get_property = intel_connector_atomic_get_property,
 337         .late_register = intel_connector_register,
 338         .early_unregister = intel_connector_unregister,
 339         .destroy = intel_dp_mst_connector_destroy,
 340         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 341         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 342 };
 343
 344 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 345 {
 346         return intel_dp_mst_get_ddc_modes(connector);
 347 }
 348
 349 static enum drm_mode_status
 350 intel_dp_mst_mode_valid(struct drm_connector *connector,
 351                         struct drm_display_mode *mode)
 352 {
 353         struct intel_connector *intel_connector = to_intel_connector(connector);
 354         struct intel_dp *intel_dp = intel_connector->mst_port;
 355         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 356         int bpp = 24; /* MST uses fixed bpp */
 357         int max_rate, mode_rate, max_lanes, max_link_clock;
 358
 359         max_link_clock = intel_dp_max_link_rate(intel_dp);
 360         max_lanes = drm_dp_max_lane_count(intel_dp->dpcd);
 361
 362         max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 363         mode_rate = intel_dp_link_required(mode->clock, bpp);
 364
 365         /* TODO - validate mode against available PBN for link */
 366         if (mode->clock < 10000)
 367                 return MODE_CLOCK_LOW;
 368
 369         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 370                 return MODE_H_ILLEGAL;
 371
 372         if (mode_rate > max_rate || mode->clock > max_dotclk)
 373                 return MODE_CLOCK_HIGH;
 374
 375         return MODE_OK;
 376 }
 377
 378 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 379                                                          struct drm_connector_state *state)
 380 {
 381         struct intel_connector *intel_connector = to_intel_connector(connector);
 382         struct intel_dp *intel_dp = intel_connector->mst_port;
 383         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 384
 385         if (!intel_dp)
 386                 return NULL;
 387         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 388 }
 389
 390 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 391 {
 392         struct intel_connector *intel_connector = to_intel_connector(connector);
 393         struct intel_dp *intel_dp = intel_connector->mst_port;
 394         if (!intel_dp)
 395                 return NULL;
 396         return &intel_dp->mst_encoders[0]->base.base;
 397 }
 398
 399 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 400         .get_modes = intel_dp_mst_get_modes,
 401         .mode_valid = intel_dp_mst_mode_valid,
 402         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 403         .best_encoder = intel_mst_best_encoder,
 404 };
 405
 406 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 407 {
 408         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 409
 410         drm_encoder_cleanup(encoder);
 411         kfree(intel_mst);
 412 }
 413
 414 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 415         .destroy = intel_dp_mst_encoder_destroy,
 416 };
 417
 418 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 419 {
 420         if (connector->encoder && connector->base.state->crtc) {
 421                 enum pipe pipe;
 422                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 423                         return false;
 424                 return true;
 425         }
 426         return false;
 427 }
 428
 429 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 430 {
 431 #ifdef CONFIG_DRM_FBDEV_EMULATION
 432         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 433
 434         if (dev_priv->fbdev)
 435                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 436                                                 &connector->base);
 437 #endif
 438 }
 439
 440 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 441 {
 442 #ifdef CONFIG_DRM_FBDEV_EMULATION
 443         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 444
 445         if (dev_priv->fbdev)
 446                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 447                                                    &connector->base);
 448 #endif
 449 }
 450
 451 static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *pathprop)
 452 {
 453         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 454         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 455         struct drm_device *dev = intel_dig_port->base.base.dev;
 456         struct intel_connector *intel_connector;
 457         struct drm_connector *connector;
 458         int i;
 459
 460         intel_connector = intel_connector_alloc();
 461         if (!intel_connector)
 462                 return NULL;
 463
 464         connector = &intel_connector->base;
 465         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 466         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 467
 468         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 469         intel_connector->mst_port = intel_dp;
 470         intel_connector->port = port;
 471
 472         for (i = PIPE_A; i <= PIPE_C; i++) {
 473                 drm_mode_connector_attach_encoder(&intel_connector->base,
 474                                                   &intel_dp->mst_encoders[i]->base.base);
 475         }
 476         intel_dp_add_properties(intel_dp, connector);
 477
 478         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 479         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 480
 481         drm_mode_connector_set_path_property(connector, pathprop);
 482         return connector;
 483 }
 484
 485 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 486 {
 487         struct intel_connector *intel_connector = to_intel_connector(connector);
 488         struct drm_device *dev = connector->dev;
 489
 490         drm_modeset_lock_all(dev);
 491         intel_connector_add_to_fbdev(intel_connector);
 492         drm_modeset_unlock_all(dev);
 493
 494         drm_connector_register(&intel_connector->base);
 495 }
 496
 497 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 498                                            struct drm_connector *connector)
 499 {
 500         struct intel_connector *intel_connector = to_intel_connector(connector);
 501         struct drm_device *dev = connector->dev;
 502
 503         drm_connector_unregister(connector);
 504
 505         /* need to nuke the connector */
 506         drm_modeset_lock_all(dev);
 507         intel_connector_remove_from_fbdev(intel_connector);
 508         intel_connector->mst_port = NULL;
 509         drm_modeset_unlock_all(dev);
 510
 511         drm_connector_unreference(&intel_connector->base);
 512         DRM_DEBUG_KMS("\n");
 513 }
 514
 515 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 516 {
 517         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 518         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 519         struct drm_device *dev = intel_dig_port->base.base.dev;
 520
 521         drm_kms_helper_hotplug_event(dev);
 522 }
 523
 524 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 525         .add_connector = intel_dp_add_mst_connector,
 526         .register_connector = intel_dp_register_mst_connector,
 527         .destroy_connector = intel_dp_destroy_mst_connector,
 528         .hotplug = intel_dp_mst_hotplug,
 529 };
 530
 531 static struct intel_dp_mst_encoder *
 532 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 533 {
 534         struct intel_dp_mst_encoder *intel_mst;
 535         struct intel_encoder *intel_encoder;
 536         struct drm_device *dev = intel_dig_port->base.base.dev;
 537
 538         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 539
 540         if (!intel_mst)
 541                 return NULL;
 542
 543         intel_mst->pipe = pipe;
 544         intel_encoder = &intel_mst->base;
 545         intel_mst->primary = intel_dig_port;
 546
 547         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 548                          DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
 549
 550         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 551         intel_encoder->power_domain = intel_dig_port->base.power_domain;
 552         intel_encoder->port = intel_dig_port->port;
 553         intel_encoder->crtc_mask = 0x7;
 554         intel_encoder->cloneable = 0;
 555
 556         intel_encoder->compute_config = intel_dp_mst_compute_config;
 557         intel_encoder->disable = intel_mst_disable_dp;
 558         intel_encoder->post_disable = intel_mst_post_disable_dp;
 559         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 560         intel_encoder->enable = intel_mst_enable_dp;
 561         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 562         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 563
 564         return intel_mst;
 565
 566 }
 567
 568 static bool
 569 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 570 {
 571         int i;
 572         struct intel_dp *intel_dp = &intel_dig_port->dp;
 573
 574         for (i = PIPE_A; i <= PIPE_C; i++)
 575                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 576         return true;
 577 }
 578
 579 int
 580 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 581 {
 582         struct intel_dp *intel_dp = &intel_dig_port->dp;
 583         struct drm_device *dev = intel_dig_port->base.base.dev;
 584         int ret;
 585
 586         intel_dp->can_mst = true;
 587         intel_dp->mst_mgr.cbs = &mst_cbs;
 588
 589         /* create encoders */
 590         intel_dp_create_fake_mst_encoders(intel_dig_port);
 591         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev,
 592                                            &intel_dp->aux, 16, 3, conn_base_id);
 593         if (ret) {
 594                 intel_dp->can_mst = false;
 595                 return ret;
 596         }
 597         return 0;
 598 }
 599
 600 void
 601 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 602 {
 603         struct intel_dp *intel_dp = &intel_dig_port->dp;
 604
 605         if (!intel_dp->can_mst)
 606                 return;
 607
 608         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 609         /* encoders will get killed by normal cleanup */
 610 }