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