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
 336 static void intel_mst_enable_dp(struct intel_encoder *encoder,
 337                                 const struct intel_crtc_state *pipe_config,
 338                                 const struct drm_connector_state *conn_state)
 339 {
 340         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 341         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 342         struct intel_dp *intel_dp = &intel_dig_port->dp;
 343         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 344
 345         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 346
 347         if (intel_de_wait_for_set(dev_priv, intel_dp->regs.dp_tp_status,
 348                                   DP_TP_STATUS_ACT_SENT, 1))
 349                 DRM_ERROR("Timed out waiting for ACT sent\n");
 350
 351         drm_dp_check_act_status(&intel_dp->mst_mgr);
 352
 353         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 354         if (pipe_config->has_audio)
 355                 intel_audio_codec_enable(encoder, pipe_config, conn_state);
 356 }
 357
 358 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 359                                       enum pipe *pipe)
 360 {
 361         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 362         *pipe = intel_mst->pipe;
 363         if (intel_mst->connector)
 364                 return true;
 365         return false;
 366 }
 367
 368 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 369                                         struct intel_crtc_state *pipe_config)
 370 {
 371         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 372         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 373
 374         intel_ddi_get_config(&intel_dig_port->base, pipe_config);
 375 }
 376
 377 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 378 {
 379         struct intel_connector *intel_connector = to_intel_connector(connector);
 380         struct intel_dp *intel_dp = intel_connector->mst_port;
 381         struct edid *edid;
 382         int ret;
 383
 384         if (drm_connector_is_unregistered(connector))
 385                 return intel_connector_update_modes(connector, NULL);
 386
 387         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 388         ret = intel_connector_update_modes(connector, edid);
 389         kfree(edid);
 390
 391         return ret;
 392 }
 393
 394 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 395         .fill_modes = drm_helper_probe_single_connector_modes,
 396         .atomic_get_property = intel_digital_connector_atomic_get_property,
 397         .atomic_set_property = intel_digital_connector_atomic_set_property,
 398         .late_register = intel_connector_register,
 399         .early_unregister = intel_connector_unregister,
 400         .destroy = intel_connector_destroy,
 401         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 402         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
 403 };
 404
 405 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 406 {
 407         return intel_dp_mst_get_ddc_modes(connector);
 408 }
 409
 410 static enum drm_mode_status
 411 intel_dp_mst_mode_valid(struct drm_connector *connector,
 412                         struct drm_display_mode *mode)
 413 {
 414         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 415         struct intel_connector *intel_connector = to_intel_connector(connector);
 416         struct intel_dp *intel_dp = intel_connector->mst_port;
 417         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 418         int max_rate, mode_rate, max_lanes, max_link_clock;
 419
 420         if (drm_connector_is_unregistered(connector))
 421                 return MODE_ERROR;
 422
 423         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 424                 return MODE_NO_DBLESCAN;
 425
 426         max_link_clock = intel_dp_max_link_rate(intel_dp);
 427         max_lanes = intel_dp_max_lane_count(intel_dp);
 428
 429         max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
 430         mode_rate = intel_dp_link_required(mode->clock, 18);
 431
 432         /* TODO - validate mode against available PBN for link */
 433         if (mode->clock < 10000)
 434                 return MODE_CLOCK_LOW;
 435
 436         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 437                 return MODE_H_ILLEGAL;
 438
 439         if (mode_rate > max_rate || mode->clock > max_dotclk)
 440                 return MODE_CLOCK_HIGH;
 441
 442         return intel_mode_valid_max_plane_size(dev_priv, mode);
 443 }
 444
 445 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
 446                                                          struct drm_connector_state *state)
 447 {
 448         struct intel_connector *intel_connector = to_intel_connector(connector);
 449         struct intel_dp *intel_dp = intel_connector->mst_port;
 450         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 451
 452         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 453 }
 454
 455 static int
 456 intel_dp_mst_detect(struct drm_connector *connector,
 457                     struct drm_modeset_acquire_ctx *ctx, bool force)
 458 {
 459         struct intel_connector *intel_connector = to_intel_connector(connector);
 460         struct intel_dp *intel_dp = intel_connector->mst_port;
 461
 462         if (drm_connector_is_unregistered(connector))
 463                 return connector_status_disconnected;
 464
 465         return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
 466                                       intel_connector->port);
 467 }
 468
 469 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 470         .get_modes = intel_dp_mst_get_modes,
 471         .mode_valid = intel_dp_mst_mode_valid,
 472         .atomic_best_encoder = intel_mst_atomic_best_encoder,
 473         .atomic_check = intel_dp_mst_atomic_check,
 474         .detect_ctx = intel_dp_mst_detect,
 475 };
 476
 477 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 478 {
 479         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 480
 481         drm_encoder_cleanup(encoder);
 482         kfree(intel_mst);
 483 }
 484
 485 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 486         .destroy = intel_dp_mst_encoder_destroy,
 487 };
 488
 489 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 490 {
 491         if (connector->encoder && connector->base.state->crtc) {
 492                 enum pipe pipe;
 493                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 494                         return false;
 495                 return true;
 496         }
 497         return false;
 498 }
 499
 500 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)
 501 {
 502         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 503         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 504         struct drm_device *dev = intel_dig_port->base.base.dev;
 505         struct drm_i915_private *dev_priv = to_i915(dev);
 506         struct intel_connector *intel_connector;
 507         struct drm_connector *connector;
 508         enum pipe pipe;
 509         int ret;
 510
 511         intel_connector = intel_connector_alloc();
 512         if (!intel_connector)
 513                 return NULL;
 514
 515         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 516         intel_connector->mst_port = intel_dp;
 517         intel_connector->port = port;
 518         drm_dp_mst_get_port_malloc(port);
 519
 520         connector = &intel_connector->base;
 521         ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
 522                                  DRM_MODE_CONNECTOR_DisplayPort);
 523         if (ret) {
 524                 intel_connector_free(intel_connector);
 525                 return NULL;
 526         }
 527
 528         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 529
 530         for_each_pipe(dev_priv, pipe) {
 531                 struct drm_encoder *enc =
 532                         &intel_dp->mst_encoders[pipe]->base.base;
 533
 534                 ret = drm_connector_attach_encoder(&intel_connector->base, enc);
 535                 if (ret)
 536                         goto err;
 537         }
 538
 539         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 540         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 541
 542         ret = drm_connector_set_path_property(connector, pathprop);
 543         if (ret)
 544                 goto err;
 545
 546         intel_attach_force_audio_property(connector);
 547         intel_attach_broadcast_rgb_property(connector);
 548
 549         /*
 550          * Reuse the prop from the SST connector because we're
 551          * not allowed to create new props after device registration.
 552          */
 553         connector->max_bpc_property =
 554                 intel_dp->attached_connector->base.max_bpc_property;
 555         if (connector->max_bpc_property)
 556                 drm_connector_attach_max_bpc_property(connector, 6, 12);
 557
 558         return connector;
 559
 560 err:
 561         drm_connector_cleanup(connector);
 562         return NULL;
 563 }
 564
 565 static void intel_dp_register_mst_connector(struct drm_connector *connector)
 566 {
 567         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 568
 569         if (dev_priv->fbdev)
 570                 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
 571                                                 connector);
 572
 573         drm_connector_register(connector);
 574 }
 575
 576 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 577                                            struct drm_connector *connector)
 578 {
 579         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 580
 581         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name);
 582         drm_connector_unregister(connector);
 583
 584         if (dev_priv->fbdev)
 585                 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
 586                                                    connector);
 587
 588         drm_connector_put(connector);
 589 }
 590
 591 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 592         .add_connector = intel_dp_add_mst_connector,
 593         .register_connector = intel_dp_register_mst_connector,
 594         .destroy_connector = intel_dp_destroy_mst_connector,
 595 };
 596
 597 static struct intel_dp_mst_encoder *
 598 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 599 {
 600         struct intel_dp_mst_encoder *intel_mst;
 601         struct intel_encoder *intel_encoder;
 602         struct drm_device *dev = intel_dig_port->base.base.dev;
 603
 604         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 605
 606         if (!intel_mst)
 607                 return NULL;
 608
 609         intel_mst->pipe = pipe;
 610         intel_encoder = &intel_mst->base;
 611         intel_mst->primary = intel_dig_port;
 612
 613         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 614                          DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
 615
 616         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 617         intel_encoder->power_domain = intel_dig_port->base.power_domain;
 618         intel_encoder->port = intel_dig_port->base.port;
 619         intel_encoder->cloneable = 0;
 620         /*
 621          * This is wrong, but broken userspace uses the intersection
 622          * of possible_crtcs of all the encoders of a given connector
 623          * to figure out which crtcs can drive said connector. What
 624          * should be used instead is the union of possible_crtcs.
 625          * To keep such userspace functioning we must misconfigure
 626          * this to make sure the intersection is not empty :(
 627          */
 628         intel_encoder->pipe_mask = ~0;
 629
 630         intel_encoder->compute_config = intel_dp_mst_compute_config;
 631         intel_encoder->disable = intel_mst_disable_dp;
 632         intel_encoder->post_disable = intel_mst_post_disable_dp;
 633         intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
 634         intel_encoder->post_pll_disable = intel_mst_post_pll_disable_dp;
 635         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 636         intel_encoder->enable = intel_mst_enable_dp;
 637         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 638         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 639
 640         return intel_mst;
 641
 642 }
 643
 644 static bool
 645 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 646 {
 647         struct intel_dp *intel_dp = &intel_dig_port->dp;
 648         struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
 649         enum pipe pipe;
 650
 651         for_each_pipe(dev_priv, pipe)
 652                 intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(intel_dig_port, pipe);
 653         return true;
 654 }
 655
 656 int
 657 intel_dp_mst_encoder_active_links(struct intel_digital_port *intel_dig_port)
 658 {
 659         return intel_dig_port->dp.active_mst_links;
 660 }
 661
 662 int
 663 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 664 {
 665         struct drm_i915_private *i915 = to_i915(intel_dig_port->base.base.dev);
 666         struct intel_dp *intel_dp = &intel_dig_port->dp;
 667         enum port port = intel_dig_port->base.port;
 668         int ret;
 669
 670         if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
 671                 return 0;
 672
 673         if (INTEL_GEN(i915) < 12 && port == PORT_A)
 674                 return 0;
 675
 676         if (INTEL_GEN(i915) < 11 && port == PORT_E)
 677                 return 0;
 678
 679         intel_dp->mst_mgr.cbs = &mst_cbs;
 680
 681         /* create encoders */
 682         intel_dp_create_fake_mst_encoders(intel_dig_port);
 683         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
 684                                            &intel_dp->aux, 16, 3, conn_base_id);
 685         if (ret)
 686                 return ret;
 687
 688         intel_dp->can_mst = true;
 689
 690         return 0;
 691 }
 692
 693 void
 694 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 695 {
 696         struct intel_dp *intel_dp = &intel_dig_port->dp;
 697
 698         if (!intel_dp->can_mst)
 699                 return;
 700
 701         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 702         /* encoders will get killed by normal cleanup */
 703 }