drivers/gpu/drm/i915/display/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/drm_atomic_helper.h>
  27 #include <drm/drm_edid.h>
  28 #include <drm/drm_probe_helper.h>
  29
  30 #include "i915_drv.h"
  31 #include "intel_atomic.h"
  32 #include "intel_audio.h"
  33 #include "intel_connector.h"
  34 #include "intel_ddi.h"
  35 #include "intel_display_types.h"
  36 #include "intel_dp.h"
  37 #include "intel_dp_mst.h"
  38 #include "intel_dpio_phy.h"
  39
  40 static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
  41                                             struct intel_crtc_state *crtc_state,
  42                                             struct drm_connector_state *conn_state,
  43                                             struct link_config_limits *limits)
  44 {
  45         struct drm_atomic_state *state = crtc_state->base.state;
  46         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  47         struct intel_dp *intel_dp = &intel_mst->primary->dp;
  48         struct intel_connector *connector =
  49                 to_intel_connector(conn_state->connector);
  50         const struct drm_display_mode *adjusted_mode =
  51                 &crtc_state->base.adjusted_mode;
  52         void *port = connector->port;
  53         bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
  54                                            DP_DPCD_QUIRK_CONSTANT_N);
  55         int bpp, slots = -EINVAL;
  56
  57         crtc_state->lane_count = limits->max_lane_count;
  58         crtc_state->port_clock = limits->max_clock;
  59
  60         for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
  61                 crtc_state->pipe_bpp = bpp;
  62
  63                 crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock,
  64                                                        crtc_state->pipe_bpp,
  65                                                        false);
  66
  67                 slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
  68                                                       port, crtc_state->pbn);
  69                 if (slots == -EDEADLK)
  70                         return slots;
  71                 if (slots >= 0)
  72                         break;
  73         }
  74
  75         if (slots < 0) {
  76                 DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
  77                 return slots;
  78         }
  79
  80         intel_link_compute_m_n(crtc_state->pipe_bpp,
  81                                crtc_state->lane_count,
  82                                adjusted_mode->crtc_clock,
  83                                crtc_state->port_clock,
  84                                &crtc_state->dp_m_n,
  85                                constant_n, crtc_state->fec_enable);
  86         crtc_state->dp_m_n.tu = slots;
  87
  88         return 0;
  89 }
  90
  91 static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
  92                                        struct intel_crtc_state *pipe_config,
  93                                        struct drm_connector_state *conn_state)
  94 {
  95         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
  96         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  97         struct intel_dp *intel_dp = &intel_mst->primary->dp;
  98         struct intel_connector *connector =
  99                 to_intel_connector(conn_state->connector);
 100         struct intel_digital_connector_state *intel_conn_state =
 101                 to_intel_digital_connector_state(conn_state);
 102         const struct drm_display_mode *adjusted_mode =
 103                 &pipe_config->base.adjusted_mode;
 104         void *port = connector->port;
 105         struct link_config_limits limits;
 106         int ret;
 107
 108         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 109                 return -EINVAL;
 110
 111         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 112         pipe_config->has_pch_encoder = false;
 113
 114         if (intel_conn_state->force_audio == HDMI_AUDIO_AUTO)
 115                 pipe_config->has_audio =
 116                         drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, port);
 117         else
 118                 pipe_config->has_audio =
 119                         intel_conn_state->force_audio == HDMI_AUDIO_ON;
 120
 121         /*
 122          * for MST we always configure max link bw - the spec doesn't
 123          * seem to suggest we should do otherwise.
 124          */
 125         limits.min_clock =
 126         limits.max_clock = intel_dp_max_link_rate(intel_dp);
 127
 128         limits.min_lane_count =
 129         limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
 130
 131         limits.min_bpp = intel_dp_min_bpp(pipe_config);
 132         /*
 133          * FIXME: If all the streams can't fit into the link with
 134          * their current pipe_bpp we should reduce pipe_bpp across
 135          * the board until things start to fit. Until then we
 136          * limit to <= 8bpc since that's what was hardcoded for all
 137          * MST streams previously. This hack should be removed once
 138          * we have the proper retry logic in place.
 139          */
 140         limits.max_bpp = min(pipe_config->pipe_bpp, 24);
 141
 142         intel_dp_adjust_compliance_config(intel_dp, pipe_config, &limits);
 143
 144         ret = intel_dp_mst_compute_link_config(encoder, pipe_config,
 145                                                conn_state, &limits);
 146         if (ret)
 147                 return ret;
 148
 149         pipe_config->limited_color_range =
 150                 intel_dp_limited_color_range(pipe_config, conn_state);
 151
 152         if (IS_GEN9_LP(dev_priv))
 153                 pipe_config->lane_lat_optim_mask =
 154                         bxt_ddi_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
 155
 156         intel_ddi_compute_min_voltage_level(dev_priv, pipe_config);
 157
 158         return 0;
 159 }
 160
 161 static int
 162 intel_dp_mst_atomic_check(struct drm_connector *connector,
 163                           struct drm_atomic_state *state)
 164 {
 165         struct drm_connector_state *new_conn_state =
 166                 drm_atomic_get_new_connector_state(state, connector);
 167         struct drm_connector_state *old_conn_state =
 168                 drm_atomic_get_old_connector_state(state, connector);
 169         struct intel_connector *intel_connector =
 170                 to_intel_connector(connector);
 171         struct drm_crtc *new_crtc = new_conn_state->crtc;
 172         struct drm_crtc_state *crtc_state;
 173         struct drm_dp_mst_topology_mgr *mgr;
 174         int ret;
 175
 176         ret = intel_digital_connector_atomic_check(connector, state);
 177         if (ret)
 178                 return ret;
 179
 180         if (!old_conn_state->crtc)
 181                 return 0;
 182
 183         /* We only want to free VCPI if this state disables the CRTC on this
 184          * connector
 185          */
 186         if (new_crtc) {
 187                 crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
 188
 189                 if (!crtc_state ||
 190                     !drm_atomic_crtc_needs_modeset(crtc_state) ||
 191                     crtc_state->enable)
 192                         return 0;
 193         }
 194
 195         mgr = &enc_to_mst(old_conn_state->best_encoder)->primary->dp.mst_mgr;
 196         ret = drm_dp_atomic_release_vcpi_slots(state, mgr,
 197                                                intel_connector->port);
 198
 199         return ret;
 200 }
 201
 202 static void intel_mst_disable_dp(struct intel_encoder *encoder,
 203                                  const struct intel_crtc_state *old_crtc_state,
 204                                  const struct drm_connector_state *old_conn_state)
 205 {
 206         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 207         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 208         struct intel_dp *intel_dp = &intel_dig_port->dp;
 209         struct intel_connector *connector =
 210                 to_intel_connector(old_conn_state->connector);
 211         int ret;
 212
 213         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 214
 215         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
 216
 217         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 218         if (ret) {
 219                 DRM_DEBUG_KMS("failed to update payload %d\n", ret);
 220         }
 221         if (old_crtc_state->has_audio)
 222                 intel_audio_codec_disable(encoder,
 223                                           old_crtc_state, old_conn_state);
 224 }
 225
 226 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 227                                       const struct intel_crtc_state *old_crtc_state,
 228                                       const struct drm_connector_state *old_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 intel_connector *connector =
 234                 to_intel_connector(old_conn_state->connector);
 235
 236         intel_ddi_disable_pipe_clock(old_crtc_state);
 237
 238         /* this can fail */
 239         drm_dp_check_act_status(&intel_dp->mst_mgr);
 240         /* and this can also fail */
 241         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 242
 243         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
 244
 245         /*
 246          * Power down mst path before disabling the port, otherwise we end
 247          * up getting interrupts from the sink upon detecting link loss.
 248          */
 249         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
 250                                      false);
 251
 252         intel_dp->active_mst_links--;
 253
 254         intel_mst->connector = NULL;
 255         if (intel_dp->active_mst_links == 0) {
 256                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 257                 intel_dig_port->base.post_disable(&intel_dig_port->base,
 258                                                   old_crtc_state, NULL);
 259         }
 260
 261         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 262 }
 263
 264 static void intel_mst_pre_pll_enable_dp(struct intel_encoder *encoder,
 265                                         const struct intel_crtc_state *pipe_config,
 266                                         const struct drm_connector_state *conn_state)
 267 {
 268         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 269         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 270         struct intel_dp *intel_dp = &intel_dig_port->dp;
 271
 272         if (intel_dp->active_mst_links == 0)
 273                 intel_dig_port->base.pre_pll_enable(&intel_dig_port->base,
 274                                                     pipe_config, NULL);
 275 }
 276
 277 static void intel_mst_post_pll_disable_dp(struct intel_encoder *encoder,
 278                                           const struct intel_crtc_state *old_crtc_state,
 279                                           const struct drm_connector_state *old_conn_state)
 280 {
 281         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 282         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 283         struct intel_dp *intel_dp = &intel_dig_port->dp;
 284
 285         if (intel_dp->active_mst_links == 0)
 286                 intel_dig_port->base.post_pll_disable(&intel_dig_port->base,
 287                                                       old_crtc_state,
 288                                                       old_conn_state);
 289 }
 290
 291 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 292                                     const struct intel_crtc_state *pipe_config,
 293                                     const struct drm_connector_state *conn_state)
 294 {
 295         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 296         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 297         struct intel_dp *intel_dp = &intel_dig_port->dp;
 298         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 299         struct intel_connector *connector =
 300                 to_intel_connector(conn_state->connector);
 301         int ret;
 302         u32 temp;
 303
 304         /* MST encoders are bound to a crtc, not to a connector,
 305          * force the mapping here for get_hw_state.
 306          */
 307         connector->encoder = encoder;
 308         intel_mst->connector = connector;
 309
 310         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 311
 312         if (intel_dp->active_mst_links == 0)
 313                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 314
 315         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
 316
 317         if (intel_dp->active_mst_links == 0)
 318                 intel_dig_port->base.pre_enable(&intel_dig_port->base,
 319                                                 pipe_config, NULL);
 320
 321         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 322                                        connector->port,
 323                                        pipe_config->pbn,
 324                                        pipe_config->dp_m_n.tu);
 325         if (!ret)
 326                 DRM_ERROR("failed to allocate vcpi\n");
 327
 328         intel_dp->active_mst_links++;
 329         temp = I915_READ(intel_dp->regs.dp_tp_status);
 330         I915_WRITE(intel_dp->regs.dp_tp_status, temp);
 331
 332         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 333
 334         intel_ddi_enable_pipe_clock(pipe_config);
 335
 336         intel_ddi_set_dp_msa(pipe_config, conn_state);
 337 }
 338
 339 static void intel_mst_enable_dp(struct intel_encoder *encoder,
 340                                 const struct intel_crtc_state *pipe_config,
 341                                 const struct drm_connector_state *conn_state)
 342 {
 343         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 344         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 345         struct intel_dp *intel_dp = &intel_dig_port->dp;
 346         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 347
 348         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 349
 350         if (intel_de_wait_for_set(dev_priv, intel_dp->regs.dp_tp_status,
 351                                   DP_TP_STATUS_ACT_SENT, 1))
 352                 DRM_ERROR("Timed out waiting for ACT sent\n");
 353
 354         drm_dp_check_act_status(&intel_dp->mst_mgr);
 355
 356         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 357         if (pipe_config->has_audio)
 358                 intel_audio_codec_enable(encoder, pipe_config, conn_state);
 359 }
 360
 361 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 362                                       enum pipe *pipe)
 363 {
 364         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 365         *pipe = intel_mst->pipe;
 366         if (intel_mst->connector)
 367                 return true;
 368         return false;
 369 }
 370
 371 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 372                                         struct intel_crtc_state *pipe_config)
 373 {
 374         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 375         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 376
 377         intel_ddi_get_config(&intel_dig_port->base, pipe_config);
 378 }
 379
 380 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 381 {
 382         struct intel_connector *intel_connector = to_intel_connector(connector);
 383         struct intel_dp *intel_dp = intel_connector->mst_port;
 384         struct edid *edid;
 385         int ret;
 386
 387         if (drm_connector_is_unregistered(connector))
 388                 return intel_connector_update_modes(connector, NULL);
 389
 390         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 391         ret = intel_connector_update_modes(connector, edid);
 392         kfree(edid);
 393
 394         return ret;
 395 }
 396
 397 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 398         .fill_modes = drm_helper_probe_single_connector_modes,
 399         .atomic_get_property = intel_digital_connector_atomic_get_property,
 400         .atomic_set_property = intel_digital_connector_atomic_set_property,
 401         .late_register = intel_connector_register,
 402         .early_unregister = intel_connector_unregister,
 403         .destroy = intel_connector_destroy,
 404         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 405         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
 406 };
 407
 408 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 409 {
 410         return intel_dp_mst_get_ddc_modes(connector);
 411 }
 412
 413 static enum drm_mode_status
 414 intel_dp_mst_mode_valid(struct drm_connector *connector,
 415                         struct drm_display_mode *mode)
 416 {
 417         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 418         struct intel_connector *intel_connector = to_intel_connector(connector);
 419         struct intel_dp *intel_dp = intel_connector->mst_port;
 420         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 421         int max_rate, mode_rate, max_lanes, max_link_clock;
 422
 423         if (drm_connector_is_unregistered(connector))
 424                 return MODE_ERROR;
 425
 426         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 427                 return MODE_NO_DBLESCAN;
 428
 429         max_link_clock = intel_dp_max_link_rate(intel_dp);
 430         max_lanes = intel_dp_max_lane_count(intel_dp);
 431
 432         max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 433         mode_rate = intel_dp_link_required(mode->clock, 18);
 434
 435         /* TODO - validate mode against available PBN for link */
 436         if (mode->clock < 10000)
 437                 return MODE_CLOCK_LOW;
 438
 439         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 440                 return MODE_H_ILLEGAL;
 441
 442         if (mode_rate > max_rate || mode->clock > max_dotclk)
 443                 return MODE_CLOCK_HIGH;
 444
 445         return intel_mode_valid_max_plane_size(dev_priv, mode);
 446 }
 447
 448 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 449                                                          struct drm_connector_state *state)
 450 {
 451         struct intel_connector *intel_connector = to_intel_connector(connector);
 452         struct intel_dp *intel_dp = intel_connector->mst_port;
 453         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 454
 455         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 456 }
 457
 458 static int
 459 intel_dp_mst_detect(struct drm_connector *connector,
 460                     struct drm_modeset_acquire_ctx *ctx, bool force)
 461 {
 462         struct intel_connector *intel_connector = to_intel_connector(connector);
 463         struct intel_dp *intel_dp = intel_connector->mst_port;
 464
 465         if (drm_connector_is_unregistered(connector))
 466                 return connector_status_disconnected;
 467
 468         return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
 469                                       intel_connector->port);
 470 }
 471
 472 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 473         .get_modes = intel_dp_mst_get_modes,
 474         .mode_valid = intel_dp_mst_mode_valid,
 475         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 476         .atomic_check = intel_dp_mst_atomic_check,
 477         .detect_ctx = intel_dp_mst_detect,
 478 };
 479
 480 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 481 {
 482         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 483
 484         drm_encoder_cleanup(encoder);
 485         kfree(intel_mst);
 486 }
 487
 488 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 489         .destroy = intel_dp_mst_encoder_destroy,
 490 };
 491
 492 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 493 {
 494         if (connector->encoder && connector->base.state->crtc) {
 495                 enum pipe pipe;
 496                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 497                         return false;
 498                 return true;
 499         }
 500         return false;
 501 }
 502
 503 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)
 504 {
 505         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 506         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 507         struct drm_device *dev = intel_dig_port->base.base.dev;
 508         struct drm_i915_private *dev_priv = to_i915(dev);
 509         struct intel_connector *intel_connector;
 510         struct drm_connector *connector;
 511         enum pipe pipe;
 512         int ret;
 513
 514         intel_connector = intel_connector_alloc();
 515         if (!intel_connector)
 516                 return NULL;
 517
 518         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 519         intel_connector->mst_port = intel_dp;
 520         intel_connector->port = port;
 521         drm_dp_mst_get_port_malloc(port);
 522
 523         connector = &intel_connector->base;
 524         ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
 525                                  DRM_MODE_CONNECTOR_DisplayPort);
 526         if (ret) {
 527                 intel_connector_free(intel_connector);
 528                 return NULL;
 529         }
 530
 531         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 532
 533         for_each_pipe(dev_priv, pipe) {
 534                 struct drm_encoder *enc =
 535                         &intel_dp->mst_encoders[pipe]->base.base;
 536
 537                 ret = drm_connector_attach_encoder(&intel_connector->base, enc);
 538                 if (ret)
 539                         goto err;
 540         }
 541
 542         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 543         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 544
 545         ret = drm_connector_set_path_property(connector, pathprop);
 546         if (ret)
 547                 goto err;
 548
 549         intel_attach_force_audio_property(connector);
 550         intel_attach_broadcast_rgb_property(connector);
 551
 552         /*
 553          * Reuse the prop from the SST connector because we're
 554          * not allowed to create new props after device registration.
 555          */
 556         connector->max_bpc_property =
 557                 intel_dp->attached_connector->base.max_bpc_property;
 558         if (connector->max_bpc_property)
 559                 drm_connector_attach_max_bpc_property(connector, 6, 12);
 560
 561         return connector;
 562
 563 err:
 564         drm_connector_cleanup(connector);
 565         return NULL;
 566 }
 567
 568 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 569 {
 570         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 571
 572         if (dev_priv->fbdev)
 573                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 574                                                 connector);
 575
 576         drm_connector_register(connector);
 577 }
 578
 579 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 580                                            struct drm_connector *connector)
 581 {
 582         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 583
 584         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name);
 585         drm_connector_unregister(connector);
 586
 587         if (dev_priv->fbdev)
 588                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 589                                                    connector);
 590
 591         drm_connector_put(connector);
 592 }
 593
 594 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 595         .add_connector = intel_dp_add_mst_connector,
 596         .register_connector = intel_dp_register_mst_connector,
 597         .destroy_connector = intel_dp_destroy_mst_connector,
 598 };
 599
 600 static struct intel_dp_mst_encoder *
 601 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 602 {
 603         struct intel_dp_mst_encoder *intel_mst;
 604         struct intel_encoder *intel_encoder;
 605         struct drm_device *dev = intel_dig_port->base.base.dev;
 606
 607         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 608
 609         if (!intel_mst)
 610                 return NULL;
 611
 612         intel_mst->pipe = pipe;
 613         intel_encoder = &intel_mst->base;
 614         intel_mst->primary = intel_dig_port;
 615
 616         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 617                          DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
 618
 619         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 620         intel_encoder->power_domain = intel_dig_port->base.power_domain;
 621         intel_encoder->port = intel_dig_port->base.port;
 622         intel_encoder->cloneable = 0;
 623         /*
 624          * This is wrong, but broken userspace uses the intersection
 625          * of possible_crtcs of all the encoders of a given connector
 626          * to figure out which crtcs can drive said connector. What
 627          * should be used instead is the union of possible_crtcs.
 628          * To keep such userspace functioning we must misconfigure
 629          * this to make sure the intersection is not empty :(
 630          */
 631         intel_encoder->pipe_mask = ~0;
 632
 633         intel_encoder->compute_config = intel_dp_mst_compute_config;
 634         intel_encoder->disable = intel_mst_disable_dp;
 635         intel_encoder->post_disable = intel_mst_post_disable_dp;
 636         intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
 637         intel_encoder->post_pll_disable = intel_mst_post_pll_disable_dp;
 638         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 639         intel_encoder->enable = intel_mst_enable_dp;
 640         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 641         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 642
 643         return intel_mst;
 644
 645 }
 646
 647 static bool
 648 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 649 {
 650         struct intel_dp *intel_dp = &intel_dig_port->dp;
 651         struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
 652         enum pipe pipe;
 653
 654         for_each_pipe(dev_priv, pipe)
 655                 intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(intel_dig_port, pipe);
 656         return true;
 657 }
 658
 659 int
 660 intel_dp_mst_encoder_active_links(struct intel_digital_port *intel_dig_port)
 661 {
 662         return intel_dig_port->dp.active_mst_links;
 663 }
 664
 665 int
 666 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 667 {
 668         struct drm_i915_private *i915 = to_i915(intel_dig_port->base.base.dev);
 669         struct intel_dp *intel_dp = &intel_dig_port->dp;
 670         enum port port = intel_dig_port->base.port;
 671         int ret;
 672
 673         if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
 674                 return 0;
 675
 676         if (INTEL_GEN(i915) < 12 && port == PORT_A)
 677                 return 0;
 678
 679         if (INTEL_GEN(i915) < 11 && port == PORT_E)
 680                 return 0;
 681
 682         intel_dp->mst_mgr.cbs = &mst_cbs;
 683
 684         /* create encoders */
 685         intel_dp_create_fake_mst_encoders(intel_dig_port);
 686         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
 687                                            &intel_dp->aux, 16, 3, conn_base_id);
 688         if (ret)
 689                 return ret;
 690
 691         intel_dp->can_mst = true;
 692
 693         return 0;
 694 }
 695
 696 void
 697 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 698 {
 699         struct intel_dp *intel_dp = &intel_dig_port->dp;
 700
 701         if (!intel_dp->can_mst)
 702                 return;
 703
 704         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 705         /* encoders will get killed by normal cleanup */
 706 }