drivers/gpu/drm/i915/intel_dp_mst.c

   1 /*
   2  * Copyright © 2008 Intel Corporation
   3  *             2014 Red Hat Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  *
  24  */
  25
  26 #include <drm/drmP.h>
  27 #include "i915_drv.h"
  28 #include "intel_drv.h"
  29 #include <drm/drm_atomic_helper.h>
  30 #include <drm/drm_crtc_helper.h>
  31 #include <drm/drm_edid.h>
  32
  33 static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
  34                                         struct intel_crtc_state *pipe_config)
  35 {
  36         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  37         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  38         struct intel_dp *intel_dp = &intel_dig_port->dp;
  39         struct drm_atomic_state *state;
  40         int bpp, i;
  41         int lane_count, slots, rate;
  42         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  43         struct drm_connector *drm_connector;
  44         struct intel_connector *connector, *found = NULL;
  45         struct drm_connector_state *connector_state;
  46         int mst_pbn;
  47
  48         pipe_config->dp_encoder_is_mst = true;
  49         pipe_config->has_pch_encoder = false;
  50         pipe_config->has_dp_encoder = true;
  51         bpp = 24;
  52         /*
  53          * for MST we always configure max link bw - the spec doesn't
  54          * seem to suggest we should do otherwise.
  55          */
  56         lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
  57
  58         rate = intel_dp_max_link_rate(intel_dp);
  59
  60         if (intel_dp->num_sink_rates) {
  61                 intel_dp->link_bw = 0;
  62                 intel_dp->rate_select = intel_dp_rate_select(intel_dp, rate);
  63         } else {
  64                 intel_dp->link_bw = drm_dp_link_rate_to_bw_code(rate);
  65                 intel_dp->rate_select = 0;
  66         }
  67
  68         intel_dp->lane_count = lane_count;
  69
  70         pipe_config->pipe_bpp = 24;
  71         pipe_config->port_clock = rate;
  72
  73         state = pipe_config->base.state;
  74
  75         for_each_connector_in_state(state, drm_connector, connector_state, i) {
  76                 connector = to_intel_connector(drm_connector);
  77
  78                 if (connector_state->best_encoder == &encoder->base) {
  79                         found = connector;
  80                         break;
  81                 }
  82         }
  83
  84         if (!found) {
  85                 DRM_ERROR("can't find connector\n");
  86                 return false;
  87         }
  88
  89         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp);
  90
  91         pipe_config->pbn = mst_pbn;
  92         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  93
  94         intel_link_compute_m_n(bpp, lane_count,
  95                                adjusted_mode->crtc_clock,
  96                                pipe_config->port_clock,
  97                                &pipe_config->dp_m_n);
  98
  99         pipe_config->dp_m_n.tu = slots;
 100         return true;
 101
 102 }
 103
 104 static void intel_mst_disable_dp(struct intel_encoder *encoder)
 105 {
 106         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 107         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 108         struct intel_dp *intel_dp = &intel_dig_port->dp;
 109         int ret;
 110
 111         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 112
 113         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
 114
 115         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 116         if (ret) {
 117                 DRM_ERROR("failed to update payload %d\n", ret);
 118         }
 119 }
 120
 121 static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
 122 {
 123         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 124         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 125         struct intel_dp *intel_dp = &intel_dig_port->dp;
 126
 127         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 128
 129         /* this can fail */
 130         drm_dp_check_act_status(&intel_dp->mst_mgr);
 131         /* and this can also fail */
 132         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 133
 134         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
 135
 136         intel_dp->active_mst_links--;
 137         intel_mst->port = NULL;
 138         if (intel_dp->active_mst_links == 0) {
 139                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 140                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 141         }
 142 }
 143
 144 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 145 {
 146         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 147         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 148         struct intel_dp *intel_dp = &intel_dig_port->dp;
 149         struct drm_device *dev = encoder->base.dev;
 150         struct drm_i915_private *dev_priv = dev->dev_private;
 151         enum port port = intel_dig_port->port;
 152         int ret;
 153         uint32_t temp;
 154         struct intel_connector *found = NULL, *connector;
 155         int slots;
 156         struct drm_crtc *crtc = encoder->base.crtc;
 157         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 158
 159         for_each_intel_connector(dev, connector) {
 160                 if (connector->base.state->best_encoder == &encoder->base) {
 161                         found = connector;
 162                         break;
 163                 }
 164         }
 165
 166         if (!found) {
 167                 DRM_ERROR("can't find connector\n");
 168                 return;
 169         }
 170
 171         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 172         intel_mst->port = found->port;
 173
 174         if (intel_dp->active_mst_links == 0) {
 175                 enum port port = intel_ddi_get_encoder_port(encoder);
 176
 177                 /* FIXME: add support for SKL */
 178                 if (INTEL_INFO(dev)->gen < 9)
 179                         I915_WRITE(PORT_CLK_SEL(port),
 180                                    intel_crtc->config->ddi_pll_sel);
 181
 182                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 183
 184                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 185
 186
 187                 intel_dp_start_link_train(intel_dp);
 188                 intel_dp_complete_link_train(intel_dp);
 189                 intel_dp_stop_link_train(intel_dp);
 190         }
 191
 192         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 193                                        intel_mst->port,
 194                                        intel_crtc->config->pbn, &slots);
 195         if (ret == false) {
 196                 DRM_ERROR("failed to allocate vcpi\n");
 197                 return;
 198         }
 199
 200
 201         intel_dp->active_mst_links++;
 202         temp = I915_READ(DP_TP_STATUS(port));
 203         I915_WRITE(DP_TP_STATUS(port), temp);
 204
 205         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 206 }
 207
 208 static void intel_mst_enable_dp(struct intel_encoder *encoder)
 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 drm_device *dev = intel_dig_port->base.base.dev;
 214         struct drm_i915_private *dev_priv = dev->dev_private;
 215         enum port port = intel_dig_port->port;
 216         int ret;
 217
 218         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 219
 220         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
 221                      1))
 222                 DRM_ERROR("Timed out waiting for ACT sent\n");
 223
 224         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 225
 226         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 227 }
 228
 229 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 230                                       enum pipe *pipe)
 231 {
 232         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 233         *pipe = intel_mst->pipe;
 234         if (intel_mst->port)
 235                 return true;
 236         return false;
 237 }
 238
 239 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 240                                         struct intel_crtc_state *pipe_config)
 241 {
 242         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 243         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 244         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 245         struct drm_device *dev = encoder->base.dev;
 246         struct drm_i915_private *dev_priv = dev->dev_private;
 247         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 248         u32 temp, flags = 0;
 249
 250         pipe_config->has_dp_encoder = true;
 251
 252         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 253         if (temp & TRANS_DDI_PHSYNC)
 254                 flags |= DRM_MODE_FLAG_PHSYNC;
 255         else
 256                 flags |= DRM_MODE_FLAG_NHSYNC;
 257         if (temp & TRANS_DDI_PVSYNC)
 258                 flags |= DRM_MODE_FLAG_PVSYNC;
 259         else
 260                 flags |= DRM_MODE_FLAG_NVSYNC;
 261
 262         switch (temp & TRANS_DDI_BPC_MASK) {
 263         case TRANS_DDI_BPC_6:
 264                 pipe_config->pipe_bpp = 18;
 265                 break;
 266         case TRANS_DDI_BPC_8:
 267                 pipe_config->pipe_bpp = 24;
 268                 break;
 269         case TRANS_DDI_BPC_10:
 270                 pipe_config->pipe_bpp = 30;
 271                 break;
 272         case TRANS_DDI_BPC_12:
 273                 pipe_config->pipe_bpp = 36;
 274                 break;
 275         default:
 276                 break;
 277         }
 278         pipe_config->base.adjusted_mode.flags |= flags;
 279         intel_dp_get_m_n(crtc, pipe_config);
 280
 281         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 282 }
 283
 284 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 285 {
 286         struct intel_connector *intel_connector = to_intel_connector(connector);
 287         struct intel_dp *intel_dp = intel_connector->mst_port;
 288         struct edid *edid;
 289         int ret;
 290
 291         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 292         if (!edid)
 293                 return 0;
 294
 295         ret = intel_connector_update_modes(connector, edid);
 296         kfree(edid);
 297
 298         return ret;
 299 }
 300
 301 static enum drm_connector_status
 302 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 303 {
 304         struct intel_connector *intel_connector = to_intel_connector(connector);
 305         struct intel_dp *intel_dp = intel_connector->mst_port;
 306
 307         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 308 }
 309
 310 static int
 311 intel_dp_mst_set_property(struct drm_connector *connector,
 312                           struct drm_property *property,
 313                           uint64_t val)
 314 {
 315         return 0;
 316 }
 317
 318 static void
 319 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 320 {
 321         struct intel_connector *intel_connector = to_intel_connector(connector);
 322
 323         if (!IS_ERR_OR_NULL(intel_connector->edid))
 324                 kfree(intel_connector->edid);
 325
 326         drm_connector_cleanup(connector);
 327         kfree(connector);
 328 }
 329
 330 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 331         .dpms = intel_connector_dpms,
 332         .detect = intel_dp_mst_detect,
 333         .fill_modes = drm_helper_probe_single_connector_modes,
 334         .set_property = intel_dp_mst_set_property,
 335         .atomic_get_property = intel_connector_atomic_get_property,
 336         .destroy = intel_dp_mst_connector_destroy,
 337         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 338         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 339 };
 340
 341 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 342 {
 343         return intel_dp_mst_get_ddc_modes(connector);
 344 }
 345
 346 static enum drm_mode_status
 347 intel_dp_mst_mode_valid(struct drm_connector *connector,
 348                         struct drm_display_mode *mode)
 349 {
 350         /* TODO - validate mode against available PBN for link */
 351         if (mode->clock < 10000)
 352                 return MODE_CLOCK_LOW;
 353
 354         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 355                 return MODE_H_ILLEGAL;
 356
 357         return MODE_OK;
 358 }
 359
 360 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 361 {
 362         struct intel_connector *intel_connector = to_intel_connector(connector);
 363         struct intel_dp *intel_dp = intel_connector->mst_port;
 364         return &intel_dp->mst_encoders[0]->base.base;
 365 }
 366
 367 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 368         .get_modes = intel_dp_mst_get_modes,
 369         .mode_valid = intel_dp_mst_mode_valid,
 370         .best_encoder = intel_mst_best_encoder,
 371 };
 372
 373 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 374 {
 375         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 376
 377         drm_encoder_cleanup(encoder);
 378         kfree(intel_mst);
 379 }
 380
 381 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 382         .destroy = intel_dp_mst_encoder_destroy,
 383 };
 384
 385 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 386 {
 387         if (connector->encoder) {
 388                 enum pipe pipe;
 389                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 390                         return false;
 391                 return true;
 392         }
 393         return false;
 394 }
 395
 396 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 397 {
 398 #ifdef CONFIG_DRM_I915_FBDEV
 399         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 400         drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
 401 #endif
 402 }
 403
 404 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 405 {
 406 #ifdef CONFIG_DRM_I915_FBDEV
 407         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 408         drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
 409 #endif
 410 }
 411
 412 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)
 413 {
 414         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 415         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 416         struct drm_device *dev = intel_dig_port->base.base.dev;
 417         struct intel_connector *intel_connector;
 418         struct drm_connector *connector;
 419         int i;
 420
 421         intel_connector = intel_connector_alloc();
 422         if (!intel_connector)
 423                 return NULL;
 424
 425         connector = &intel_connector->base;
 426         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 427         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 428
 429         intel_connector->unregister = intel_connector_unregister;
 430         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 431         intel_connector->mst_port = intel_dp;
 432         intel_connector->port = port;
 433
 434         for (i = PIPE_A; i <= PIPE_C; i++) {
 435                 drm_mode_connector_attach_encoder(&intel_connector->base,
 436                                                   &intel_dp->mst_encoders[i]->base.base);
 437         }
 438         intel_dp_add_properties(intel_dp, connector);
 439
 440         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 441         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 442
 443         drm_mode_connector_set_path_property(connector, pathprop);
 444         drm_reinit_primary_mode_group(dev);
 445         mutex_lock(&dev->mode_config.mutex);
 446         intel_connector_add_to_fbdev(intel_connector);
 447         mutex_unlock(&dev->mode_config.mutex);
 448         drm_connector_register(&intel_connector->base);
 449         return connector;
 450 }
 451
 452 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 453                                            struct drm_connector *connector)
 454 {
 455         struct intel_connector *intel_connector = to_intel_connector(connector);
 456         struct drm_device *dev = connector->dev;
 457         /* need to nuke the connector */
 458         mutex_lock(&dev->mode_config.mutex);
 459         intel_connector_dpms(connector, DRM_MODE_DPMS_OFF);
 460         mutex_unlock(&dev->mode_config.mutex);
 461
 462         intel_connector->unregister(intel_connector);
 463
 464         mutex_lock(&dev->mode_config.mutex);
 465         intel_connector_remove_from_fbdev(intel_connector);
 466         drm_connector_cleanup(connector);
 467         mutex_unlock(&dev->mode_config.mutex);
 468
 469         drm_reinit_primary_mode_group(dev);
 470
 471         kfree(intel_connector);
 472         DRM_DEBUG_KMS("\n");
 473 }
 474
 475 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 476 {
 477         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 478         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 479         struct drm_device *dev = intel_dig_port->base.base.dev;
 480
 481         drm_kms_helper_hotplug_event(dev);
 482 }
 483
 484 static struct drm_dp_mst_topology_cbs mst_cbs = {
 485         .add_connector = intel_dp_add_mst_connector,
 486         .destroy_connector = intel_dp_destroy_mst_connector,
 487         .hotplug = intel_dp_mst_hotplug,
 488 };
 489
 490 static struct intel_dp_mst_encoder *
 491 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 492 {
 493         struct intel_dp_mst_encoder *intel_mst;
 494         struct intel_encoder *intel_encoder;
 495         struct drm_device *dev = intel_dig_port->base.base.dev;
 496
 497         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 498
 499         if (!intel_mst)
 500                 return NULL;
 501
 502         intel_mst->pipe = pipe;
 503         intel_encoder = &intel_mst->base;
 504         intel_mst->primary = intel_dig_port;
 505
 506         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 507                          DRM_MODE_ENCODER_DPMST);
 508
 509         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 510         intel_encoder->crtc_mask = 0x7;
 511         intel_encoder->cloneable = 0;
 512
 513         intel_encoder->compute_config = intel_dp_mst_compute_config;
 514         intel_encoder->disable = intel_mst_disable_dp;
 515         intel_encoder->post_disable = intel_mst_post_disable_dp;
 516         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 517         intel_encoder->enable = intel_mst_enable_dp;
 518         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 519         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 520
 521         return intel_mst;
 522
 523 }
 524
 525 static bool
 526 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 527 {
 528         int i;
 529         struct intel_dp *intel_dp = &intel_dig_port->dp;
 530
 531         for (i = PIPE_A; i <= PIPE_C; i++)
 532                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 533         return true;
 534 }
 535
 536 int
 537 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 538 {
 539         struct intel_dp *intel_dp = &intel_dig_port->dp;
 540         struct drm_device *dev = intel_dig_port->base.base.dev;
 541         int ret;
 542
 543         intel_dp->can_mst = true;
 544         intel_dp->mst_mgr.cbs = &mst_cbs;
 545
 546         /* create encoders */
 547         intel_dp_create_fake_mst_encoders(intel_dig_port);
 548         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 549         if (ret) {
 550                 intel_dp->can_mst = false;
 551                 return ret;
 552         }
 553         return 0;
 554 }
 555
 556 void
 557 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 558 {
 559         struct intel_dp *intel_dp = &intel_dig_port->dp;
 560
 561         if (!intel_dp->can_mst)
 562                 return;
 563
 564         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 565         /* encoders will get killed by normal cleanup */
 566 }