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                                  struct intel_crtc_state *old_crtc_state,
 127                                  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("%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                                       struct intel_crtc_state *old_crtc_state,
 150                                       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         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 159
 160         /* this can fail */
 161         drm_dp_check_act_status(&intel_dp->mst_mgr);
 162         /* and this can also fail */
 163         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 164
 165         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
 166
 167         intel_dp->active_mst_links--;
 168
 169         intel_mst->connector = NULL;
 170         if (intel_dp->active_mst_links == 0) {
 171                 intel_dig_port->base.post_disable(&intel_dig_port->base,
 172                                                   NULL, NULL);
 173
 174                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 175         }
 176 }
 177
 178 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 179                                     struct intel_crtc_state *pipe_config,
 180                                     struct drm_connector_state *conn_state)
 181 {
 182         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 183         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 184         struct intel_dp *intel_dp = &intel_dig_port->dp;
 185         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 186         enum port port = intel_dig_port->port;
 187         struct intel_connector *connector =
 188                 to_intel_connector(conn_state->connector);
 189         int ret;
 190         uint32_t temp;
 191
 192         /* MST encoders are bound to a crtc, not to a connector,
 193          * force the mapping here for get_hw_state.
 194          */
 195         connector->encoder = encoder;
 196         intel_mst->connector = connector;
 197
 198         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 199
 200         if (intel_dp->active_mst_links == 0)
 201                 intel_dig_port->base.pre_enable(&intel_dig_port->base,
 202                                                 pipe_config, NULL);
 203
 204         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 205                                        connector->port,
 206                                        pipe_config->pbn,
 207                                        pipe_config->dp_m_n.tu);
 208         if (ret == false) {
 209                 DRM_ERROR("failed to allocate vcpi\n");
 210                 return;
 211         }
 212
 213
 214         intel_dp->active_mst_links++;
 215         temp = I915_READ(DP_TP_STATUS(port));
 216         I915_WRITE(DP_TP_STATUS(port), temp);
 217
 218         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 219 }
 220
 221 static void intel_mst_enable_dp(struct intel_encoder *encoder,
 222                                 struct intel_crtc_state *pipe_config,
 223                                 struct drm_connector_state *conn_state)
 224 {
 225         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 226         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 227         struct intel_dp *intel_dp = &intel_dig_port->dp;
 228         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 229         enum port port = intel_dig_port->port;
 230         int ret;
 231
 232         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 233
 234         if (intel_wait_for_register(dev_priv,
 235                                     DP_TP_STATUS(port),
 236                                     DP_TP_STATUS_ACT_SENT,
 237                                     DP_TP_STATUS_ACT_SENT,
 238                                     1))
 239                 DRM_ERROR("Timed out waiting for ACT sent\n");
 240
 241         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 242
 243         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 244         if (pipe_config->has_audio)
 245                 intel_audio_codec_enable(encoder, pipe_config, conn_state);
 246 }
 247
 248 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 249                                       enum pipe *pipe)
 250 {
 251         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 252         *pipe = intel_mst->pipe;
 253         if (intel_mst->connector)
 254                 return true;
 255         return false;
 256 }
 257
 258 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 259                                         struct intel_crtc_state *pipe_config)
 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_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 264         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 265         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 266         u32 temp, flags = 0;
 267
 268         pipe_config->has_audio =
 269                 intel_ddi_is_audio_enabled(dev_priv, crtc);
 270
 271         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 272         if (temp & TRANS_DDI_PHSYNC)
 273                 flags |= DRM_MODE_FLAG_PHSYNC;
 274         else
 275                 flags |= DRM_MODE_FLAG_NHSYNC;
 276         if (temp & TRANS_DDI_PVSYNC)
 277                 flags |= DRM_MODE_FLAG_PVSYNC;
 278         else
 279                 flags |= DRM_MODE_FLAG_NVSYNC;
 280
 281         switch (temp & TRANS_DDI_BPC_MASK) {
 282         case TRANS_DDI_BPC_6:
 283                 pipe_config->pipe_bpp = 18;
 284                 break;
 285         case TRANS_DDI_BPC_8:
 286                 pipe_config->pipe_bpp = 24;
 287                 break;
 288         case TRANS_DDI_BPC_10:
 289                 pipe_config->pipe_bpp = 30;
 290                 break;
 291         case TRANS_DDI_BPC_12:
 292                 pipe_config->pipe_bpp = 36;
 293                 break;
 294         default:
 295                 break;
 296         }
 297         pipe_config->base.adjusted_mode.flags |= flags;
 298
 299         pipe_config->lane_count =
 300                 ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
 301
 302         intel_dp_get_m_n(crtc, pipe_config);
 303
 304         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 305 }
 306
 307 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 308 {
 309         struct intel_connector *intel_connector = to_intel_connector(connector);
 310         struct intel_dp *intel_dp = intel_connector->mst_port;
 311         struct edid *edid;
 312         int ret;
 313
 314         if (!intel_dp) {
 315                 return intel_connector_update_modes(connector, NULL);
 316         }
 317
 318         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 319         ret = intel_connector_update_modes(connector, edid);
 320         kfree(edid);
 321
 322         return ret;
 323 }
 324
 325 static enum drm_connector_status
 326 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 327 {
 328         struct intel_connector *intel_connector = to_intel_connector(connector);
 329         struct intel_dp *intel_dp = intel_connector->mst_port;
 330
 331         if (!intel_dp)
 332                 return connector_status_disconnected;
 333         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 334 }
 335
 336 static void
 337 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 338 {
 339         struct intel_connector *intel_connector = to_intel_connector(connector);
 340
 341         if (!IS_ERR_OR_NULL(intel_connector->edid))
 342                 kfree(intel_connector->edid);
 343
 344         drm_connector_cleanup(connector);
 345         kfree(connector);
 346 }
 347
 348 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 349         .dpms = drm_atomic_helper_connector_dpms,
 350         .detect = intel_dp_mst_detect,
 351         .fill_modes = drm_helper_probe_single_connector_modes,
 352         .set_property = drm_atomic_helper_connector_set_property,
 353         .late_register = intel_connector_register,
 354         .early_unregister = intel_connector_unregister,
 355         .destroy = intel_dp_mst_connector_destroy,
 356         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 357         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 358 };
 359
 360 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 361 {
 362         return intel_dp_mst_get_ddc_modes(connector);
 363 }
 364
 365 static enum drm_mode_status
 366 intel_dp_mst_mode_valid(struct drm_connector *connector,
 367                         struct drm_display_mode *mode)
 368 {
 369         struct intel_connector *intel_connector = to_intel_connector(connector);
 370         struct intel_dp *intel_dp = intel_connector->mst_port;
 371         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 372         int bpp = 24; /* MST uses fixed bpp */
 373         int max_rate, mode_rate, max_lanes, max_link_clock;
 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 void intel_connector_add_to_fbdev(struct intel_connector *connector)
 447 {
 448 #ifdef CONFIG_DRM_FBDEV_EMULATION
 449         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 450
 451         if (dev_priv->fbdev)
 452                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 453                                                 &connector->base);
 454 #endif
 455 }
 456
 457 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 458 {
 459 #ifdef CONFIG_DRM_FBDEV_EMULATION
 460         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 461
 462         if (dev_priv->fbdev)
 463                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 464                                                    &connector->base);
 465 #endif
 466 }
 467
 468 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)
 469 {
 470         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 471         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 472         struct drm_device *dev = intel_dig_port->base.base.dev;
 473         struct intel_connector *intel_connector;
 474         struct drm_connector *connector;
 475         int i;
 476
 477         intel_connector = intel_connector_alloc();
 478         if (!intel_connector)
 479                 return NULL;
 480
 481         connector = &intel_connector->base;
 482         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 483         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 484
 485         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 486         intel_connector->mst_port = intel_dp;
 487         intel_connector->port = port;
 488
 489         for (i = PIPE_A; i <= PIPE_C; i++) {
 490                 drm_mode_connector_attach_encoder(&intel_connector->base,
 491                                                   &intel_dp->mst_encoders[i]->base.base);
 492         }
 493
 494         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 495         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 496
 497         drm_mode_connector_set_path_property(connector, pathprop);
 498         return connector;
 499 }
 500
 501 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 502 {
 503         struct intel_connector *intel_connector = to_intel_connector(connector);
 504         struct drm_device *dev = connector->dev;
 505
 506         drm_modeset_lock_all(dev);
 507         intel_connector_add_to_fbdev(intel_connector);
 508         drm_modeset_unlock_all(dev);
 509
 510         drm_connector_register(&intel_connector->base);
 511 }
 512
 513 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 514                                            struct drm_connector *connector)
 515 {
 516         struct intel_connector *intel_connector = to_intel_connector(connector);
 517         struct drm_device *dev = connector->dev;
 518
 519         drm_connector_unregister(connector);
 520
 521         /* need to nuke the connector */
 522         drm_modeset_lock_all(dev);
 523         intel_connector_remove_from_fbdev(intel_connector);
 524         intel_connector->mst_port = NULL;
 525         drm_modeset_unlock_all(dev);
 526
 527         drm_connector_unreference(&intel_connector->base);
 528         DRM_DEBUG_KMS("\n");
 529 }
 530
 531 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 532 {
 533         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 534         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 535         struct drm_device *dev = intel_dig_port->base.base.dev;
 536
 537         drm_kms_helper_hotplug_event(dev);
 538 }
 539
 540 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 541         .add_connector = intel_dp_add_mst_connector,
 542         .register_connector = intel_dp_register_mst_connector,
 543         .destroy_connector = intel_dp_destroy_mst_connector,
 544         .hotplug = intel_dp_mst_hotplug,
 545 };
 546
 547 static struct intel_dp_mst_encoder *
 548 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 549 {
 550         struct intel_dp_mst_encoder *intel_mst;
 551         struct intel_encoder *intel_encoder;
 552         struct drm_device *dev = intel_dig_port->base.base.dev;
 553
 554         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 555
 556         if (!intel_mst)
 557                 return NULL;
 558
 559         intel_mst->pipe = pipe;
 560         intel_encoder = &intel_mst->base;
 561         intel_mst->primary = intel_dig_port;
 562
 563         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 564                          DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
 565
 566         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 567         intel_encoder->power_domain = intel_dig_port->base.power_domain;
 568         intel_encoder->port = intel_dig_port->port;
 569         intel_encoder->crtc_mask = 0x7;
 570         intel_encoder->cloneable = 0;
 571
 572         intel_encoder->compute_config = intel_dp_mst_compute_config;
 573         intel_encoder->disable = intel_mst_disable_dp;
 574         intel_encoder->post_disable = intel_mst_post_disable_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         int i;
 588         struct intel_dp *intel_dp = &intel_dig_port->dp;
 589
 590         for (i = PIPE_A; i <= PIPE_C; i++)
 591                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 592         return true;
 593 }
 594
 595 int
 596 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 597 {
 598         struct intel_dp *intel_dp = &intel_dig_port->dp;
 599         struct drm_device *dev = intel_dig_port->base.base.dev;
 600         int ret;
 601
 602         intel_dp->can_mst = true;
 603         intel_dp->mst_mgr.cbs = &mst_cbs;
 604
 605         /* create encoders */
 606         intel_dp_create_fake_mst_encoders(intel_dig_port);
 607         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev,
 608                                            &intel_dp->aux, 16, 3, conn_base_id);
 609         if (ret) {
 610                 intel_dp->can_mst = false;
 611                 return ret;
 612         }
 613         return 0;
 614 }
 615
 616 void
 617 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 618 {
 619         struct intel_dp *intel_dp = &intel_dig_port->dp;
 620
 621         if (!intel_dp->can_mst)
 622                 return;
 623
 624         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 625         /* encoders will get killed by normal cleanup */
 626 }