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_crtc_helper.h>
  30 #include <drm/drm_edid.h>
  31
  32 static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
  33                                         struct intel_crtc_config *pipe_config)
  34 {
  35         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  36         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  37         struct intel_dp *intel_dp = &intel_dig_port->dp;
  38         struct drm_device *dev = encoder->base.dev;
  39         int bpp;
  40         int lane_count, slots;
  41         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
  42         struct intel_connector *found = NULL, *intel_connector;
  43         int mst_pbn;
  44
  45         pipe_config->dp_encoder_is_mst = true;
  46         pipe_config->has_pch_encoder = false;
  47         pipe_config->has_dp_encoder = true;
  48         bpp = 24;
  49         /*
  50          * for MST we always configure max link bw - the spec doesn't
  51          * seem to suggest we should do otherwise.
  52          */
  53         lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
  54         intel_dp->link_bw = intel_dp_max_link_bw(intel_dp);
  55         intel_dp->lane_count = lane_count;
  56
  57         pipe_config->pipe_bpp = 24;
  58         pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
  59
  60         list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
  61                 if (intel_connector->new_encoder == encoder) {
  62                         found = intel_connector;
  63                         break;
  64                 }
  65         }
  66
  67         if (!found) {
  68                 DRM_ERROR("can't find connector\n");
  69                 return false;
  70         }
  71
  72         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp);
  73
  74         pipe_config->pbn = mst_pbn;
  75         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  76
  77         intel_link_compute_m_n(bpp, lane_count,
  78                                adjusted_mode->crtc_clock,
  79                                pipe_config->port_clock,
  80                                &pipe_config->dp_m_n);
  81
  82         pipe_config->dp_m_n.tu = slots;
  83         return true;
  84
  85 }
  86
  87 static void intel_mst_disable_dp(struct intel_encoder *encoder)
  88 {
  89         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  90         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  91         struct intel_dp *intel_dp = &intel_dig_port->dp;
  92         int ret;
  93
  94         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
  95
  96         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
  97
  98         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
  99         if (ret) {
 100                 DRM_ERROR("failed to update payload %d\n", ret);
 101         }
 102 }
 103
 104 static void intel_mst_post_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
 110         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 111
 112         /* this can fail */
 113         drm_dp_check_act_status(&intel_dp->mst_mgr);
 114         /* and this can also fail */
 115         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 116
 117         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
 118
 119         intel_dp->active_mst_links--;
 120         intel_mst->port = NULL;
 121         if (intel_dp->active_mst_links == 0) {
 122                 intel_dig_port->base.post_disable(&intel_dig_port->base);
 123                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 124         }
 125 }
 126
 127 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
 128 {
 129         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 130         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 131         struct intel_dp *intel_dp = &intel_dig_port->dp;
 132         struct drm_device *dev = encoder->base.dev;
 133         struct drm_i915_private *dev_priv = dev->dev_private;
 134         enum port port = intel_dig_port->port;
 135         int ret;
 136         uint32_t temp;
 137         struct intel_connector *found = NULL, *intel_connector;
 138         int slots;
 139         struct drm_crtc *crtc = encoder->base.crtc;
 140         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 141
 142         list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
 143                 if (intel_connector->new_encoder == encoder) {
 144                         found = intel_connector;
 145                         break;
 146                 }
 147         }
 148
 149         if (!found) {
 150                 DRM_ERROR("can't find connector\n");
 151                 return;
 152         }
 153
 154         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 155         intel_mst->port = found->port;
 156
 157         if (intel_dp->active_mst_links == 0) {
 158                 enum port port = intel_ddi_get_encoder_port(encoder);
 159
 160                 I915_WRITE(PORT_CLK_SEL(port), intel_crtc->config.ddi_pll_sel);
 161
 162                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
 163
 164                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
 165
 166
 167                 intel_dp_start_link_train(intel_dp);
 168                 intel_dp_complete_link_train(intel_dp);
 169                 intel_dp_stop_link_train(intel_dp);
 170         }
 171
 172         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 173                                        intel_mst->port, intel_crtc->config.pbn, &slots);
 174         if (ret == false) {
 175                 DRM_ERROR("failed to allocate vcpi\n");
 176                 return;
 177         }
 178
 179
 180         intel_dp->active_mst_links++;
 181         temp = I915_READ(DP_TP_STATUS(port));
 182         I915_WRITE(DP_TP_STATUS(port), temp);
 183
 184         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
 185 }
 186
 187 static void intel_mst_enable_dp(struct intel_encoder *encoder)
 188 {
 189         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 190         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 191         struct intel_dp *intel_dp = &intel_dig_port->dp;
 192         struct drm_device *dev = intel_dig_port->base.base.dev;
 193         struct drm_i915_private *dev_priv = dev->dev_private;
 194         enum port port = intel_dig_port->port;
 195         int ret;
 196
 197         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 198
 199         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
 200                      1))
 201                 DRM_ERROR("Timed out waiting for ACT sent\n");
 202
 203         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
 204
 205         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 206 }
 207
 208 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 209                                       enum pipe *pipe)
 210 {
 211         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 212         *pipe = intel_mst->pipe;
 213         if (intel_mst->port)
 214                 return true;
 215         return false;
 216 }
 217
 218 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 219                                         struct intel_crtc_config *pipe_config)
 220 {
 221         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 222         struct intel_digital_port *intel_dig_port = intel_mst->primary;
 223         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 224         struct drm_device *dev = encoder->base.dev;
 225         struct drm_i915_private *dev_priv = dev->dev_private;
 226         enum transcoder cpu_transcoder = crtc->config.cpu_transcoder;
 227         u32 temp, flags = 0;
 228
 229         pipe_config->has_dp_encoder = true;
 230
 231         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
 232         if (temp & TRANS_DDI_PHSYNC)
 233                 flags |= DRM_MODE_FLAG_PHSYNC;
 234         else
 235                 flags |= DRM_MODE_FLAG_NHSYNC;
 236         if (temp & TRANS_DDI_PVSYNC)
 237                 flags |= DRM_MODE_FLAG_PVSYNC;
 238         else
 239                 flags |= DRM_MODE_FLAG_NVSYNC;
 240
 241         switch (temp & TRANS_DDI_BPC_MASK) {
 242         case TRANS_DDI_BPC_6:
 243                 pipe_config->pipe_bpp = 18;
 244                 break;
 245         case TRANS_DDI_BPC_8:
 246                 pipe_config->pipe_bpp = 24;
 247                 break;
 248         case TRANS_DDI_BPC_10:
 249                 pipe_config->pipe_bpp = 30;
 250                 break;
 251         case TRANS_DDI_BPC_12:
 252                 pipe_config->pipe_bpp = 36;
 253                 break;
 254         default:
 255                 break;
 256         }
 257         pipe_config->adjusted_mode.flags |= flags;
 258         intel_dp_get_m_n(crtc, pipe_config);
 259
 260         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
 261 }
 262
 263 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 264 {
 265         struct intel_connector *intel_connector = to_intel_connector(connector);
 266         struct intel_dp *intel_dp = intel_connector->mst_port;
 267         struct edid *edid;
 268         int ret;
 269
 270         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
 271         if (!edid)
 272                 return 0;
 273
 274         ret = intel_connector_update_modes(connector, edid);
 275         kfree(edid);
 276
 277         return ret;
 278 }
 279
 280 static enum drm_connector_status
 281 intel_dp_mst_detect(struct drm_connector *connector, bool force)
 282 {
 283         struct intel_connector *intel_connector = to_intel_connector(connector);
 284         struct intel_dp *intel_dp = intel_connector->mst_port;
 285
 286         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 287 }
 288
 289 static int
 290 intel_dp_mst_set_property(struct drm_connector *connector,
 291                           struct drm_property *property,
 292                           uint64_t val)
 293 {
 294         return 0;
 295 }
 296
 297 static void
 298 intel_dp_mst_connector_destroy(struct drm_connector *connector)
 299 {
 300         struct intel_connector *intel_connector = to_intel_connector(connector);
 301
 302         if (!IS_ERR_OR_NULL(intel_connector->edid))
 303                 kfree(intel_connector->edid);
 304
 305         drm_connector_cleanup(connector);
 306         kfree(connector);
 307 }
 308
 309 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
 310         .dpms = intel_connector_dpms,
 311         .detect = intel_dp_mst_detect,
 312         .fill_modes = drm_helper_probe_single_connector_modes,
 313         .set_property = intel_dp_mst_set_property,
 314         .destroy = intel_dp_mst_connector_destroy,
 315 };
 316
 317 static int intel_dp_mst_get_modes(struct drm_connector *connector)
 318 {
 319         return intel_dp_mst_get_ddc_modes(connector);
 320 }
 321
 322 static enum drm_mode_status
 323 intel_dp_mst_mode_valid(struct drm_connector *connector,
 324                         struct drm_display_mode *mode)
 325 {
 326         /* TODO - validate mode against available PBN for link */
 327         if (mode->clock < 10000)
 328                 return MODE_CLOCK_LOW;
 329
 330         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 331                 return MODE_H_ILLEGAL;
 332
 333         return MODE_OK;
 334 }
 335
 336 static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
 337 {
 338         struct intel_connector *intel_connector = to_intel_connector(connector);
 339         struct intel_dp *intel_dp = intel_connector->mst_port;
 340         return &intel_dp->mst_encoders[0]->base.base;
 341 }
 342
 343 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
 344         .get_modes = intel_dp_mst_get_modes,
 345         .mode_valid = intel_dp_mst_mode_valid,
 346         .best_encoder = intel_mst_best_encoder,
 347 };
 348
 349 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 350 {
 351         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 352
 353         drm_encoder_cleanup(encoder);
 354         kfree(intel_mst);
 355 }
 356
 357 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
 358         .destroy = intel_dp_mst_encoder_destroy,
 359 };
 360
 361 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 362 {
 363         if (connector->encoder) {
 364                 enum pipe pipe;
 365                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
 366                         return false;
 367                 return true;
 368         }
 369         return false;
 370 }
 371
 372 static void intel_connector_add_to_fbdev(struct intel_connector *connector)
 373 {
 374 #ifdef CONFIG_DRM_I915_FBDEV
 375         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 376         drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
 377 #endif
 378 }
 379
 380 static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
 381 {
 382 #ifdef CONFIG_DRM_I915_FBDEV
 383         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 384         drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
 385 #endif
 386 }
 387
 388 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)
 389 {
 390         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 391         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 392         struct drm_device *dev = intel_dig_port->base.base.dev;
 393         struct intel_connector *intel_connector;
 394         struct drm_connector *connector;
 395         int i;
 396
 397         intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
 398         if (!intel_connector)
 399                 return NULL;
 400
 401         connector = &intel_connector->base;
 402         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 403         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
 404
 405         intel_connector->unregister = intel_connector_unregister;
 406         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
 407         intel_connector->mst_port = intel_dp;
 408         intel_connector->port = port;
 409
 410         for (i = PIPE_A; i <= PIPE_C; i++) {
 411                 drm_mode_connector_attach_encoder(&intel_connector->base,
 412                                                   &intel_dp->mst_encoders[i]->base.base);
 413         }
 414         intel_dp_add_properties(intel_dp, connector);
 415
 416         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 417         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 418
 419         drm_mode_connector_set_path_property(connector, pathprop);
 420         drm_reinit_primary_mode_group(dev);
 421         mutex_lock(&dev->mode_config.mutex);
 422         intel_connector_add_to_fbdev(intel_connector);
 423         mutex_unlock(&dev->mode_config.mutex);
 424         drm_connector_register(&intel_connector->base);
 425         return connector;
 426 }
 427
 428 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 429                                            struct drm_connector *connector)
 430 {
 431         struct intel_connector *intel_connector = to_intel_connector(connector);
 432         struct drm_device *dev = connector->dev;
 433         /* need to nuke the connector */
 434         mutex_lock(&dev->mode_config.mutex);
 435         intel_connector_dpms(connector, DRM_MODE_DPMS_OFF);
 436         mutex_unlock(&dev->mode_config.mutex);
 437
 438         intel_connector->unregister(intel_connector);
 439
 440         mutex_lock(&dev->mode_config.mutex);
 441         intel_connector_remove_from_fbdev(intel_connector);
 442         drm_connector_cleanup(connector);
 443         mutex_unlock(&dev->mode_config.mutex);
 444
 445         drm_reinit_primary_mode_group(dev);
 446
 447         kfree(intel_connector);
 448         DRM_DEBUG_KMS("\n");
 449 }
 450
 451 static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 452 {
 453         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 454         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 455         struct drm_device *dev = intel_dig_port->base.base.dev;
 456
 457         drm_kms_helper_hotplug_event(dev);
 458 }
 459
 460 static struct drm_dp_mst_topology_cbs mst_cbs = {
 461         .add_connector = intel_dp_add_mst_connector,
 462         .destroy_connector = intel_dp_destroy_mst_connector,
 463         .hotplug = intel_dp_mst_hotplug,
 464 };
 465
 466 static struct intel_dp_mst_encoder *
 467 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
 468 {
 469         struct intel_dp_mst_encoder *intel_mst;
 470         struct intel_encoder *intel_encoder;
 471         struct drm_device *dev = intel_dig_port->base.base.dev;
 472
 473         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
 474
 475         if (!intel_mst)
 476                 return NULL;
 477
 478         intel_mst->pipe = pipe;
 479         intel_encoder = &intel_mst->base;
 480         intel_mst->primary = intel_dig_port;
 481
 482         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
 483                          DRM_MODE_ENCODER_DPMST);
 484
 485         intel_encoder->type = INTEL_OUTPUT_DP_MST;
 486         intel_encoder->crtc_mask = 0x7;
 487         intel_encoder->cloneable = 0;
 488
 489         intel_encoder->compute_config = intel_dp_mst_compute_config;
 490         intel_encoder->disable = intel_mst_disable_dp;
 491         intel_encoder->post_disable = intel_mst_post_disable_dp;
 492         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
 493         intel_encoder->enable = intel_mst_enable_dp;
 494         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 495         intel_encoder->get_config = intel_dp_mst_enc_get_config;
 496
 497         return intel_mst;
 498
 499 }
 500
 501 static bool
 502 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
 503 {
 504         int i;
 505         struct intel_dp *intel_dp = &intel_dig_port->dp;
 506
 507         for (i = PIPE_A; i <= PIPE_C; i++)
 508                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
 509         return true;
 510 }
 511
 512 int
 513 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
 514 {
 515         struct intel_dp *intel_dp = &intel_dig_port->dp;
 516         struct drm_device *dev = intel_dig_port->base.base.dev;
 517         int ret;
 518
 519         intel_dp->can_mst = true;
 520         intel_dp->mst_mgr.cbs = &mst_cbs;
 521
 522         /* create encoders */
 523         intel_dp_create_fake_mst_encoders(intel_dig_port);
 524         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
 525         if (ret) {
 526                 intel_dp->can_mst = false;
 527                 return ret;
 528         }
 529         return 0;
 530 }
 531
 532 void
 533 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
 534 {
 535         struct intel_dp *intel_dp = &intel_dig_port->dp;
 536
 537         if (!intel_dp->can_mst)
 538                 return;
 539
 540         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
 541         /* encoders will get killed by normal cleanup */
 542 }