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->uapi.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->hw.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, 0);
  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->hw.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_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                 struct intel_atomic_state *intel_state =
 187                         to_intel_atomic_state(state);
 188                 struct intel_crtc *intel_crtc = to_intel_crtc(new_crtc);
 189                 struct intel_crtc_state *crtc_state =
 190                         intel_atomic_get_new_crtc_state(intel_state,
 191                                                         intel_crtc);
 192
 193                 if (!crtc_state ||
 194                     !drm_atomic_crtc_needs_modeset(&crtc_state->uapi) ||
 195                     crtc_state->uapi.enable)
 196                         return 0;
 197         }
 198
 199         mgr = &enc_to_mst(old_conn_state->best_encoder)->primary->dp.mst_mgr;
 200         ret = drm_dp_atomic_release_vcpi_slots(state, mgr,
 201                                                intel_connector->port);
 202
 203         return ret;
 204 }
 205
 206 static void intel_mst_disable_dp(struct intel_encoder *encoder,
 207                                  const struct intel_crtc_state *old_crtc_state,
 208                                  const struct drm_connector_state *old_conn_state)
 209 {
 210         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 211         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 212         struct intel_dp *intel_dp = &intel_dig_port->dp;
 213         struct intel_connector *connector =
 214                 to_intel_connector(old_conn_state->connector);
 215         int ret;
 216
 217         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 218
 219         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
 220
 221         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 222         if (ret) {
 223                 DRM_DEBUG_KMS("failed to update payload %d\n", ret);
 224         }
 225         if (old_crtc_state->has_audio)
 226                 intel_audio_codec_disable(encoder,
 227                                           old_crtc_state, old_conn_state);
 228 }
 229
 230 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 231                                       const struct intel_crtc_state *old_crtc_state,
 232                                       const struct drm_connector_state *old_conn_state)
 233 {
 234         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 235         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 236         struct intel_dp *intel_dp = &intel_dig_port->dp;
 237         struct intel_connector *connector =
 238                 to_intel_connector(old_conn_state->connector);
 239         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 240         bool last_mst_stream;
 241
 242         intel_dp->active_mst_links--;
 243         last_mst_stream = intel_dp->active_mst_links == 0;
 244
 245         intel_crtc_vblank_off(old_crtc_state);
 246
 247         intel_disable_pipe(old_crtc_state);
 248
 249         intel_ddi_disable_transcoder_func(old_crtc_state);
 250
 251         if (INTEL_GEN(dev_priv) >= 9)
 252                 skylake_scaler_disable(old_crtc_state);
 253         else
 254                 ironlake_pfit_disable(old_crtc_state);
 255
 256         /*
 257          * From TGL spec: "If multi-stream slave transcoder: Configure
 258          * Transcoder Clock Select to direct no clock to the transcoder"
 259          *
 260          * From older GENs spec: "Configure Transcoder Clock Select to direct
 261          * no clock to the transcoder"
 262          */
 263         if (INTEL_GEN(dev_priv) < 12 || !last_mst_stream)
 264                 intel_ddi_disable_pipe_clock(old_crtc_state);
 265
 266         /* this can fail */
 267         drm_dp_check_act_status(&intel_dp->mst_mgr);
 268         /* and this can also fail */
 269         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 270
 271         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
 272
 273         /*
 274          * Power down mst path before disabling the port, otherwise we end
 275          * up getting interrupts from the sink upon detecting link loss.
 276          */
 277         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
 278                                      false);
 279
 280         intel_mst->connector = NULL;
 281         if (last_mst_stream)
 282                 intel_dig_port->base.post_disable(&intel_dig_port->base,
 283                                                   old_crtc_state, NULL);
 284
 285         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 286 }
 287
 288 static void intel_mst_pre_pll_enable_dp(struct intel_encoder *encoder,
 289                                         const struct intel_crtc_state *pipe_config,
 290                                         const struct drm_connector_state *conn_state)
 291 {
 292         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 293         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 294         struct intel_dp *intel_dp = &intel_dig_port->dp;
 295
 296         if (intel_dp->active_mst_links == 0)
 297                 intel_dig_port->base.pre_pll_enable(&intel_dig_port->base,
 298                                                     pipe_config, NULL);
 299 }
 300
 301 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 302                                     const struct intel_crtc_state *pipe_config,
 303                                     const struct drm_connector_state *conn_state)
 304 {
 305         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 306         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 307         struct intel_dp *intel_dp = &intel_dig_port->dp;
 308         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 309         struct intel_connector *connector =
 310                 to_intel_connector(conn_state->connector);
 311         int ret;
 312         u32 temp;
 313         bool first_mst_stream;
 314
 315         /* MST encoders are bound to a crtc, not to a connector,
 316          * force the mapping here for get_hw_state.
 317          */
 318         connector->encoder = encoder;
 319         intel_mst->connector = connector;
 320         first_mst_stream = intel_dp->active_mst_links == 0;
 321
 322         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 323
 324         if (first_mst_stream)
 325                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 326
 327         drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
 328
 329         if (first_mst_stream)
 330                 intel_dig_port->base.pre_enable(&intel_dig_port->base,
 331                                                 pipe_config, NULL);
 332
 333         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 334                                        connector->port,
 335                                        pipe_config->pbn,
 336                                        pipe_config->dp_m_n.tu);
 337         if (!ret)
 338                 DRM_ERROR("failed to allocate vcpi\n");
 339
 340         intel_dp->active_mst_links++;
 341         temp = I915_READ(intel_dp->regs.dp_tp_status);
 342         I915_WRITE(intel_dp->regs.dp_tp_status, temp);
 343
 344         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 345
 346         /*
 347          * Before Gen 12 this is not done as part of
 348          * intel_dig_port->base.pre_enable() and should be done here. For
 349          * Gen 12+ the step in which this should be done is different for the
 350          * first MST stream, so it's done on the DDI for the first stream and
 351          * here for the following ones.
 352          */
 353         if (INTEL_GEN(dev_priv) < 12 || !first_mst_stream)
 354                 intel_ddi_enable_pipe_clock(pipe_config);
 355
 356         intel_ddi_set_dp_msa(pipe_config, conn_state);
 357 }
 358
 359 static void intel_mst_enable_dp(struct intel_encoder *encoder,
 360                                 const struct intel_crtc_state *pipe_config,
 361                                 const struct drm_connector_state *conn_state)
 362 {
 363         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 364         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 365         struct intel_dp *intel_dp = &intel_dig_port->dp;
 366         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 367
 368         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 369
 370         if (intel_de_wait_for_set(dev_priv, intel_dp->regs.dp_tp_status,
 371                                   DP_TP_STATUS_ACT_SENT, 1))
 372                 DRM_ERROR("Timed out waiting for ACT sent\n");
 373
 374         drm_dp_check_act_status(&intel_dp->mst_mgr);
 375
 376         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 377         if (pipe_config->has_audio)
 378                 intel_audio_codec_enable(encoder, pipe_config, conn_state);
 379 }
 380
 381 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 382                                       enum pipe *pipe)
 383 {
 384         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 385         *pipe = intel_mst->pipe;
 386         if (intel_mst->connector)
 387                 return true;
 388         return false;
 389 }
 390
 391 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 392                                         struct intel_crtc_state *pipe_config)
 393 {
 394         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 395         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 396
 397         intel_ddi_get_config(&intel_dig_port->base, pipe_config);
 398 }
 399
 400 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 401 {
 402         struct intel_connector *intel_connector = to_intel_connector(connector);
 403         struct intel_dp *intel_dp = intel_connector->mst_port;
 404         struct edid *edid;
 405         int ret;
 406
 407         if (drm_connector_is_unregistered(connector))
 408                 return intel_connector_update_modes(connector, NULL);
 409
 410         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 411         ret = intel_connector_update_modes(connector, edid);
 412         kfree(edid);
 413
 414         return ret;
 415 }
 416
 417 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 418         .fill_modes = drm_helper_probe_single_connector_modes,
 419         .atomic_get_property = intel_digital_connector_atomic_get_property,
 420         .atomic_set_property = intel_digital_connector_atomic_set_property,
 421         .late_register = intel_connector_register,
 422         .early_unregister = intel_connector_unregister,
 423         .destroy = intel_connector_destroy,
 424         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 425         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
 426 };
 427
 428 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 429 {
 430         return intel_dp_mst_get_ddc_modes(connector);
 431 }
 432
 433 static enum drm_mode_status
 434 intel_dp_mst_mode_valid(struct drm_connector *connector,
 435                         struct drm_display_mode *mode)
 436 {
 437         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 438         struct intel_connector *intel_connector = to_intel_connector(connector);
 439         struct intel_dp *intel_dp = intel_connector->mst_port;
 440         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 441         int max_rate, mode_rate, max_lanes, max_link_clock;
 442
 443         if (drm_connector_is_unregistered(connector))
 444                 return MODE_ERROR;
 445
 446         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 447                 return MODE_NO_DBLESCAN;
 448
 449         max_link_clock = intel_dp_max_link_rate(intel_dp);
 450         max_lanes = intel_dp_max_lane_count(intel_dp);
 451
 452         max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 453         mode_rate = intel_dp_link_required(mode->clock, 18);
 454
 455         /* TODO - validate mode against available PBN for link */
 456         if (mode->clock < 10000)
 457                 return MODE_CLOCK_LOW;
 458
 459         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 460                 return MODE_H_ILLEGAL;
 461
 462         if (mode_rate > max_rate || mode->clock > max_dotclk)
 463                 return MODE_CLOCK_HIGH;
 464
 465         return intel_mode_valid_max_plane_size(dev_priv, mode);
 466 }
 467
 468 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 469                                                          struct drm_connector_state *state)
 470 {
 471         struct intel_connector *intel_connector = to_intel_connector(connector);
 472         struct intel_dp *intel_dp = intel_connector->mst_port;
 473         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 474
 475         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 476 }
 477
 478 static int
 479 intel_dp_mst_detect(struct drm_connector *connector,
 480                     struct drm_modeset_acquire_ctx *ctx, bool force)
 481 {
 482         struct intel_connector *intel_connector = to_intel_connector(connector);
 483         struct intel_dp *intel_dp = intel_connector->mst_port;
 484
 485         if (drm_connector_is_unregistered(connector))
 486                 return connector_status_disconnected;
 487
 488         return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
 489                                       intel_connector->port);
 490 }
 491
 492 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 493         .get_modes = intel_dp_mst_get_modes,
 494         .mode_valid = intel_dp_mst_mode_valid,
 495         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 496         .atomic_check = intel_dp_mst_atomic_check,
 497         .detect_ctx = intel_dp_mst_detect,
 498 };
 499
 500 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 501 {
 502         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 503
 504         drm_encoder_cleanup(encoder);
 505         kfree(intel_mst);
 506 }
 507
 508 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 509         .destroy = intel_dp_mst_encoder_destroy,
 510 };
 511
 512 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 513 {
 514         if (connector->encoder && connector->base.state->crtc) {
 515                 enum pipe pipe;
 516                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 517                         return false;
 518                 return true;
 519         }
 520         return false;
 521 }
 522
 523 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)
 524 {
 525         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 526         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 527         struct drm_device *dev = intel_dig_port->base.base.dev;
 528         struct drm_i915_private *dev_priv = to_i915(dev);
 529         struct intel_connector *intel_connector;
 530         struct drm_connector *connector;
 531         enum pipe pipe;
 532         int ret;
 533
 534         intel_connector = intel_connector_alloc();
 535         if (!intel_connector)
 536                 return NULL;
 537
 538         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 539         intel_connector->mst_port = intel_dp;
 540         intel_connector->port = port;
 541         drm_dp_mst_get_port_malloc(port);
 542
 543         connector = &intel_connector->base;
 544         ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
 545                                  DRM_MODE_CONNECTOR_DisplayPort);
 546         if (ret) {
 547                 intel_connector_free(intel_connector);
 548                 return NULL;
 549         }
 550
 551         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 552
 553         for_each_pipe(dev_priv, pipe) {
 554                 struct drm_encoder *enc =
 555                         &intel_dp->mst_encoders[pipe]->base.base;
 556
 557                 ret = drm_connector_attach_encoder(&intel_connector->base, enc);
 558                 if (ret)
 559                         goto err;
 560         }
 561
 562         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 563         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 564
 565         ret = drm_connector_set_path_property(connector, pathprop);
 566         if (ret)
 567                 goto err;
 568
 569         intel_attach_force_audio_property(connector);
 570         intel_attach_broadcast_rgb_property(connector);
 571
 572         /*
 573          * Reuse the prop from the SST connector because we're
 574          * not allowed to create new props after device registration.
 575          */
 576         connector->max_bpc_property =
 577                 intel_dp->attached_connector->base.max_bpc_property;
 578         if (connector->max_bpc_property)
 579                 drm_connector_attach_max_bpc_property(connector, 6, 12);
 580
 581         return connector;
 582
 583 err:
 584         drm_connector_cleanup(connector);
 585         return NULL;
 586 }
 587
 588 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 589 {
 590         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 591
 592         if (dev_priv->fbdev)
 593                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 594                                                 connector);
 595
 596         drm_connector_register(connector);
 597 }
 598
 599 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 600                                            struct drm_connector *connector)
 601 {
 602         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 603
 604         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name);
 605         drm_connector_unregister(connector);
 606
 607         if (dev_priv->fbdev)
 608                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 609                                                    connector);
 610
 611         drm_connector_put(connector);
 612 }
 613
 614 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 615         .add_connector = intel_dp_add_mst_connector,
 616         .register_connector = intel_dp_register_mst_connector,
 617         .destroy_connector = intel_dp_destroy_mst_connector,
 618 };
 619
 620 static struct intel_dp_mst_encoder *
 621 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 622 {
 623         struct intel_dp_mst_encoder *intel_mst;
 624         struct intel_encoder *intel_encoder;
 625         struct drm_device *dev = intel_dig_port->base.base.dev;
 626
 627         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 628
 629         if (!intel_mst)
 630                 return NULL;
 631
 632         intel_mst->pipe = pipe;
 633         intel_encoder = &intel_mst->base;
 634         intel_mst->primary = intel_dig_port;
 635
 636         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 637                          DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
 638
 639         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 640         intel_encoder->power_domain = intel_dig_port->base.power_domain;
 641         intel_encoder->port = intel_dig_port->base.port;
 642         intel_encoder->cloneable = 0;
 643         /*
 644          * This is wrong, but broken userspace uses the intersection
 645          * of possible_crtcs of all the encoders of a given connector
 646          * to figure out which crtcs can drive said connector. What
 647          * should be used instead is the union of possible_crtcs.
 648          * To keep such userspace functioning we must misconfigure
 649          * this to make sure the intersection is not empty :(
 650          */
 651         intel_encoder->pipe_mask = ~0;
 652
 653         intel_encoder->compute_config = intel_dp_mst_compute_config;
 654         intel_encoder->disable = intel_mst_disable_dp;
 655         intel_encoder->post_disable = intel_mst_post_disable_dp;
 656         intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
 657         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 658         intel_encoder->enable = intel_mst_enable_dp;
 659         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 660         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 661
 662         return intel_mst;
 663
 664 }
 665
 666 static bool
 667 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 668 {
 669         struct intel_dp *intel_dp = &intel_dig_port->dp;
 670         struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
 671         enum pipe pipe;
 672
 673         for_each_pipe(dev_priv, pipe)
 674                 intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(intel_dig_port, pipe);
 675         return true;
 676 }
 677
 678 int
 679 intel_dp_mst_encoder_active_links(struct intel_digital_port *intel_dig_port)
 680 {
 681         return intel_dig_port->dp.active_mst_links;
 682 }
 683
 684 int
 685 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 686 {
 687         struct drm_i915_private *i915 = to_i915(intel_dig_port->base.base.dev);
 688         struct intel_dp *intel_dp = &intel_dig_port->dp;
 689         enum port port = intel_dig_port->base.port;
 690         int ret;
 691
 692         if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
 693                 return 0;
 694
 695         if (INTEL_GEN(i915) < 12 && port == PORT_A)
 696                 return 0;
 697
 698         if (INTEL_GEN(i915) < 11 && port == PORT_E)
 699                 return 0;
 700
 701         intel_dp->mst_mgr.cbs = &mst_cbs;
 702
 703         /* create encoders */
 704         intel_dp_create_fake_mst_encoders(intel_dig_port);
 705         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
 706                                            &intel_dp->aux, 16, 3, conn_base_id);
 707         if (ret)
 708                 return ret;
 709
 710         intel_dp->can_mst = true;
 711
 712         return 0;
 713 }
 714
 715 void
 716 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 717 {
 718         struct intel_dp *intel_dp = &intel_dig_port->dp;
 719
 720         if (!intel_dp->can_mst)
 721                 return;
 722
 723         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 724         /* encoders will get killed by normal cleanup */
 725 }