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_device *dev = encoder->base.dev;
  40         int bpp;
  41         int lane_count, slots;
  42         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  43         struct intel_connector *found = NULL, *intel_connector;
  44         int mst_pbn;
  45
  46         pipe_config->dp_encoder_is_mst = true;
  47         pipe_config->has_pch_encoder = false;
  48         pipe_config->has_dp_encoder = true;
  49         bpp = 24;
  50         /*
  51          * for MST we always configure max link bw - the spec doesn't
  52          * seem to suggest we should do otherwise.
  53          */
  54         lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
  55         intel_dp->link_bw = intel_dp_max_link_bw(intel_dp);
  56         intel_dp->lane_count = lane_count;
  57
  58         pipe_config->pipe_bpp = 24;
  59         pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
  60
  61         list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
  62                 if (intel_connector->new_encoder == encoder) {
  63                         found = intel_connector;
  64                         break;
  65                 }
  66         }
  67
  68         if (!found) {
  69                 DRM_ERROR("can't find connector\n");
  70                 return false;
  71         }
  72
  73         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp);
  74
  75         pipe_config->pbn = mst_pbn;
  76         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  77
  78         intel_link_compute_m_n(bpp, lane_count,
  79                                adjusted_mode->crtc_clock,
  80                                pipe_config->port_clock,
  81                                &pipe_config->dp_m_n);
  82
  83         pipe_config->dp_m_n.tu = slots;
  84         return true;
  85
  86 }
  87
  88 static void intel_mst_disable_dp(struct intel_encoder *encoder)
  89 {
  90         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  91         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  92         struct intel_dp *intel_dp = &intel_dig_port->dp;
  93         int ret;
  94
  95         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
  96
  97         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
  98
  99         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 100         if (ret) {
 101                 DRM_ERROR("failed to update payload %d\n", ret);
 102         }
 103 }
 104
 105 static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
 106 {
 107         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 108         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 109         struct intel_dp *intel_dp = &intel_dig_port->dp;
 110
 111         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 112
 113         /* this can fail */
 114         drm_dp_check_act_status(&intel_dp->mst_mgr);
 115         /* and this can also fail */
 116         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 117
 118         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
 119
 120         intel_dp->active_mst_links--;
 121         intel_mst->port = NULL;
 122         if (intel_dp->active_mst_links == 0) {
 123                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 124                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 125         }
 126 }
 127
 128 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 129 {
 130         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 131         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 132         struct intel_dp *intel_dp = &intel_dig_port->dp;
 133         struct drm_device *dev = encoder->base.dev;
 134         struct drm_i915_private *dev_priv = dev->dev_private;
 135         enum port port = intel_dig_port->port;
 136         int ret;
 137         uint32_t temp;
 138         struct intel_connector *found = NULL, *intel_connector;
 139         int slots;
 140         struct drm_crtc *crtc = encoder->base.crtc;
 141         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 142
 143         list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
 144                 if (intel_connector->new_encoder == encoder) {
 145                         found = intel_connector;
 146                         break;
 147                 }
 148         }
 149
 150         if (!found) {
 151                 DRM_ERROR("can't find connector\n");
 152                 return;
 153         }
 154
 155         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 156         intel_mst->port = found->port;
 157
 158         if (intel_dp->active_mst_links == 0) {
 159                 enum port port = intel_ddi_get_encoder_port(encoder);
 160
 161                 I915_WRITE(PORT_CLK_SEL(port),
 162                            intel_crtc->config->ddi_pll_sel);
 163
 164                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 165
 166                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 167
 168
 169                 intel_dp_start_link_train(intel_dp);
 170                 intel_dp_complete_link_train(intel_dp);
 171                 intel_dp_stop_link_train(intel_dp);
 172         }
 173
 174         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 175                                        intel_mst->port,
 176                                        intel_crtc->config->pbn, &slots);
 177         if (ret == false) {
 178                 DRM_ERROR("failed to allocate vcpi\n");
 179                 return;
 180         }
 181
 182
 183         intel_dp->active_mst_links++;
 184         temp = I915_READ(DP_TP_STATUS(port));
 185         I915_WRITE(DP_TP_STATUS(port), temp);
 186
 187         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 188 }
 189
 190 static void intel_mst_enable_dp(struct intel_encoder *encoder)
 191 {
 192         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 193         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 194         struct intel_dp *intel_dp = &intel_dig_port->dp;
 195         struct drm_device *dev = intel_dig_port->base.base.dev;
 196         struct drm_i915_private *dev_priv = dev->dev_private;
 197         enum port port = intel_dig_port->port;
 198         int ret;
 199
 200         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 201
 202         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
 203                      1))
 204                 DRM_ERROR("Timed out waiting for ACT sent\n");
 205
 206         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 207
 208         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 209 }
 210
 211 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 212                                       enum pipe *pipe)
 213 {
 214         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 215         *pipe = intel_mst->pipe;
 216         if (intel_mst->port)
 217                 return true;
 218         return false;
 219 }
 220
 221 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 222                                         struct intel_crtc_state *pipe_config)
 223 {
 224         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 225         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 226         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 227         struct drm_device *dev = encoder->base.dev;
 228         struct drm_i915_private *dev_priv = dev->dev_private;
 229         enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
 230         u32 temp, flags = 0;
 231
 232         pipe_config->has_dp_encoder = true;
 233
 234         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 235         if (temp & TRANS_DDI_PHSYNC)
 236                 flags |= DRM_MODE_FLAG_PHSYNC;
 237         else
 238                 flags |= DRM_MODE_FLAG_NHSYNC;
 239         if (temp & TRANS_DDI_PVSYNC)
 240                 flags |= DRM_MODE_FLAG_PVSYNC;
 241         else
 242                 flags |= DRM_MODE_FLAG_NVSYNC;
 243
 244         switch (temp & TRANS_DDI_BPC_MASK) {
 245         case TRANS_DDI_BPC_6:
 246                 pipe_config->pipe_bpp = 18;
 247                 break;
 248         case TRANS_DDI_BPC_8:
 249                 pipe_config->pipe_bpp = 24;
 250                 break;
 251         case TRANS_DDI_BPC_10:
 252                 pipe_config->pipe_bpp = 30;
 253                 break;
 254         case TRANS_DDI_BPC_12:
 255                 pipe_config->pipe_bpp = 36;
 256                 break;
 257         default:
 258                 break;
 259         }
 260         pipe_config->base.adjusted_mode.flags |= flags;
 261         intel_dp_get_m_n(crtc, pipe_config);
 262
 263         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 264 }
 265
 266 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 267 {
 268         struct intel_connector *intel_connector = to_intel_connector(connector);
 269         struct intel_dp *intel_dp = intel_connector->mst_port;
 270         struct edid *edid;
 271         int ret;
 272
 273         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 274         if (!edid)
 275                 return 0;
 276
 277         ret = intel_connector_update_modes(connector, edid);
 278         kfree(edid);
 279
 280         return ret;
 281 }
 282
 283 static enum drm_connector_status
 284 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 285 {
 286         struct intel_connector *intel_connector = to_intel_connector(connector);
 287         struct intel_dp *intel_dp = intel_connector->mst_port;
 288
 289         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 290 }
 291
 292 static int
 293 intel_dp_mst_set_property(struct drm_connector *connector,
 294                           struct drm_property *property,
 295                           uint64_t val)
 296 {
 297         return 0;
 298 }
 299
 300 static void
 301 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 302 {
 303         struct intel_connector *intel_connector = to_intel_connector(connector);
 304
 305         if (!IS_ERR_OR_NULL(intel_connector->edid))
 306                 kfree(intel_connector->edid);
 307
 308         drm_connector_cleanup(connector);
 309         kfree(connector);
 310 }
 311
 312 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 313         .dpms = intel_connector_dpms,
 314         .detect = intel_dp_mst_detect,
 315         .fill_modes = drm_helper_probe_single_connector_modes,
 316         .set_property = intel_dp_mst_set_property,
 317         .atomic_get_property = intel_connector_atomic_get_property,
 318         .destroy = intel_dp_mst_connector_destroy,
 319         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 320 };
 321
 322 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 323 {
 324         return intel_dp_mst_get_ddc_modes(connector);
 325 }
 326
 327 static enum drm_mode_status
 328 intel_dp_mst_mode_valid(struct drm_connector *connector,
 329                         struct drm_display_mode *mode)
 330 {
 331         /* TODO - validate mode against available PBN for link */
 332         if (mode->clock < 10000)
 333                 return MODE_CLOCK_LOW;
 334
 335         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 336                 return MODE_H_ILLEGAL;
 337
 338         return MODE_OK;
 339 }
 340
 341 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 342 {
 343         struct intel_connector *intel_connector = to_intel_connector(connector);
 344         struct intel_dp *intel_dp = intel_connector->mst_port;
 345         return &intel_dp->mst_encoders[0]->base.base;
 346 }
 347
 348 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 349         .get_modes = intel_dp_mst_get_modes,
 350         .mode_valid = intel_dp_mst_mode_valid,
 351         .best_encoder = intel_mst_best_encoder,
 352 };
 353
 354 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 355 {
 356         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 357
 358         drm_encoder_cleanup(encoder);
 359         kfree(intel_mst);
 360 }
 361
 362 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 363         .destroy = intel_dp_mst_encoder_destroy,
 364 };
 365
 366 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 367 {
 368         if (connector->encoder) {
 369                 enum pipe pipe;
 370                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 371                         return false;
 372                 return true;
 373         }
 374         return false;
 375 }
 376
 377 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 378 {
 379 #ifdef CONFIG_DRM_I915_FBDEV
 380         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 381         drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
 382 #endif
 383 }
 384
 385 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 386 {
 387 #ifdef CONFIG_DRM_I915_FBDEV
 388         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 389         drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
 390 #endif
 391 }
 392
 393 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)
 394 {
 395         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 396         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 397         struct drm_device *dev = intel_dig_port->base.base.dev;
 398         struct intel_connector *intel_connector;
 399         struct drm_connector *connector;
 400         int i;
 401
 402         intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
 403         if (!intel_connector)
 404                 return NULL;
 405
 406         connector = &intel_connector->base;
 407         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 408         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 409
 410         intel_connector->unregister = intel_connector_unregister;
 411         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 412         intel_connector->mst_port = intel_dp;
 413         intel_connector->port = port;
 414
 415         for (i = PIPE_A; i <= PIPE_C; i++) {
 416                 drm_mode_connector_attach_encoder(&intel_connector->base,
 417                                                   &intel_dp->mst_encoders[i]->base.base);
 418         }
 419         intel_dp_add_properties(intel_dp, connector);
 420
 421         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 422         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 423
 424         drm_mode_connector_set_path_property(connector, pathprop);
 425         drm_reinit_primary_mode_group(dev);
 426         mutex_lock(&dev->mode_config.mutex);
 427         intel_connector_add_to_fbdev(intel_connector);
 428         mutex_unlock(&dev->mode_config.mutex);
 429         drm_connector_register(&intel_connector->base);
 430         return connector;
 431 }
 432
 433 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 434                                            struct drm_connector *connector)
 435 {
 436         struct intel_connector *intel_connector = to_intel_connector(connector);
 437         struct drm_device *dev = connector->dev;
 438         /* need to nuke the connector */
 439         mutex_lock(&dev->mode_config.mutex);
 440         intel_connector_dpms(connector, DRM_MODE_DPMS_OFF);
 441         mutex_unlock(&dev->mode_config.mutex);
 442
 443         intel_connector->unregister(intel_connector);
 444
 445         mutex_lock(&dev->mode_config.mutex);
 446         intel_connector_remove_from_fbdev(intel_connector);
 447         drm_connector_cleanup(connector);
 448         mutex_unlock(&dev->mode_config.mutex);
 449
 450         drm_reinit_primary_mode_group(dev);
 451
 452         kfree(intel_connector);
 453         DRM_DEBUG_KMS("\n");
 454 }
 455
 456 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 457 {
 458         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 459         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 460         struct drm_device *dev = intel_dig_port->base.base.dev;
 461
 462         drm_kms_helper_hotplug_event(dev);
 463 }
 464
 465 static struct drm_dp_mst_topology_cbs mst_cbs = {
 466         .add_connector = intel_dp_add_mst_connector,
 467         .destroy_connector = intel_dp_destroy_mst_connector,
 468         .hotplug = intel_dp_mst_hotplug,
 469 };
 470
 471 static struct intel_dp_mst_encoder *
 472 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 473 {
 474         struct intel_dp_mst_encoder *intel_mst;
 475         struct intel_encoder *intel_encoder;
 476         struct drm_device *dev = intel_dig_port->base.base.dev;
 477
 478         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 479
 480         if (!intel_mst)
 481                 return NULL;
 482
 483         intel_mst->pipe = pipe;
 484         intel_encoder = &intel_mst->base;
 485         intel_mst->primary = intel_dig_port;
 486
 487         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 488                          DRM_MODE_ENCODER_DPMST);
 489
 490         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 491         intel_encoder->crtc_mask = 0x7;
 492         intel_encoder->cloneable = 0;
 493
 494         intel_encoder->compute_config = intel_dp_mst_compute_config;
 495         intel_encoder->disable = intel_mst_disable_dp;
 496         intel_encoder->post_disable = intel_mst_post_disable_dp;
 497         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 498         intel_encoder->enable = intel_mst_enable_dp;
 499         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 500         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 501
 502         return intel_mst;
 503
 504 }
 505
 506 static bool
 507 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 508 {
 509         int i;
 510         struct intel_dp *intel_dp = &intel_dig_port->dp;
 511
 512         for (i = PIPE_A; i <= PIPE_C; i++)
 513                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 514         return true;
 515 }
 516
 517 int
 518 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 519 {
 520         struct intel_dp *intel_dp = &intel_dig_port->dp;
 521         struct drm_device *dev = intel_dig_port->base.base.dev;
 522         int ret;
 523
 524         intel_dp->can_mst = true;
 525         intel_dp->mst_mgr.cbs = &mst_cbs;
 526
 527         /* create encoders */
 528         intel_dp_create_fake_mst_encoders(intel_dig_port);
 529         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 530         if (ret) {
 531                 intel_dp->can_mst = false;
 532                 return ret;
 533         }
 534         return 0;
 535 }
 536
 537 void
 538 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 539 {
 540         struct intel_dp *intel_dp = &intel_dig_port->dp;
 541
 542         if (!intel_dp->can_mst)
 543                 return;
 544
 545         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 546         /* encoders will get killed by normal cleanup */
 547 }