drivers/gpu/drm/radeon/radeon_dp_mst.c

   1 // SPDX-License-Identifier: MIT
   2
   3 #include <drm/drm_debugfs.h>
   4 #include <drm/drm_dp_mst_helper.h>
   5 #include <drm/drm_fb_helper.h>
   6 #include <drm/drm_file.h>
   7 #include <drm/drm_probe_helper.h>
   8
   9 #include "atom.h"
  10 #include "ni_reg.h"
  11 #include "radeon.h"
  12
  13 static struct radeon_encoder *radeon_dp_create_fake_mst_encoder(struct radeon_connector *connector);
  14
  15 static int radeon_atom_set_enc_offset(int id)
  16 {
  17         static const int offsets[] = { EVERGREEN_CRTC0_REGISTER_OFFSET,
  18                                        EVERGREEN_CRTC1_REGISTER_OFFSET,
  19                                        EVERGREEN_CRTC2_REGISTER_OFFSET,
  20                                        EVERGREEN_CRTC3_REGISTER_OFFSET,
  21                                        EVERGREEN_CRTC4_REGISTER_OFFSET,
  22                                        EVERGREEN_CRTC5_REGISTER_OFFSET,
  23                                        0x13830 - 0x7030 };
  24
  25         return offsets[id];
  26 }
  27
  28 static int radeon_dp_mst_set_be_cntl(struct radeon_encoder *primary,
  29                                      struct radeon_encoder_mst *mst_enc,
  30                                      enum radeon_hpd_id hpd, bool enable)
  31 {
  32         struct drm_device *dev = primary->base.dev;
  33         struct radeon_device *rdev = dev->dev_private;
  34         uint32_t reg;
  35         int retries = 0;
  36         uint32_t temp;
  37
  38         reg = RREG32(NI_DIG_BE_CNTL + primary->offset);
  39
  40         /* set MST mode */
  41         reg &= ~NI_DIG_FE_DIG_MODE(7);
  42         reg |= NI_DIG_FE_DIG_MODE(NI_DIG_MODE_DP_MST);
  43
  44         if (enable)
  45                 reg |= NI_DIG_FE_SOURCE_SELECT(1 << mst_enc->fe);
  46         else
  47                 reg &= ~NI_DIG_FE_SOURCE_SELECT(1 << mst_enc->fe);
  48
  49         reg |= NI_DIG_HPD_SELECT(hpd);
  50         DRM_DEBUG_KMS("writing 0x%08x 0x%08x\n", NI_DIG_BE_CNTL + primary->offset, reg);
  51         WREG32(NI_DIG_BE_CNTL + primary->offset, reg);
  52
  53         if (enable) {
  54                 uint32_t offset = radeon_atom_set_enc_offset(mst_enc->fe);
  55
  56                 do {
  57                         temp = RREG32(NI_DIG_FE_CNTL + offset);
  58                 } while ((temp & NI_DIG_SYMCLK_FE_ON) && retries++ < 10000);
  59                 if (retries == 10000)
  60                         DRM_ERROR("timed out waiting for FE %d %d\n", primary->offset, mst_enc->fe);
  61         }
  62         return 0;
  63 }
  64
  65 static int radeon_dp_mst_set_stream_attrib(struct radeon_encoder *primary,
  66                                            int stream_number,
  67                                            int fe,
  68                                            int slots)
  69 {
  70         struct drm_device *dev = primary->base.dev;
  71         struct radeon_device *rdev = dev->dev_private;
  72         u32 temp, val;
  73         int retries  = 0;
  74         int satreg, satidx;
  75
  76         satreg = stream_number >> 1;
  77         satidx = stream_number & 1;
  78
  79         temp = RREG32(NI_DP_MSE_SAT0 + satreg + primary->offset);
  80
  81         val = NI_DP_MSE_SAT_SLOT_COUNT0(slots) | NI_DP_MSE_SAT_SRC0(fe);
  82
  83         val <<= (16 * satidx);
  84
  85         temp &= ~(0xffff << (16 * satidx));
  86
  87         temp |= val;
  88
  89         DRM_DEBUG_KMS("writing 0x%08x 0x%08x\n", NI_DP_MSE_SAT0 + satreg + primary->offset, temp);
  90         WREG32(NI_DP_MSE_SAT0 + satreg + primary->offset, temp);
  91
  92         WREG32(NI_DP_MSE_SAT_UPDATE + primary->offset, 1);
  93
  94         do {
  95                 unsigned value1, value2;
  96                 udelay(10);
  97                 temp = RREG32(NI_DP_MSE_SAT_UPDATE + primary->offset);
  98
  99                 value1 = temp & NI_DP_MSE_SAT_UPDATE_MASK;
 100                 value2 = temp & NI_DP_MSE_16_MTP_KEEPOUT;
 101
 102                 if (!value1 && !value2)
 103                         break;
 104         } while (retries++ < 50);
 105
 106         if (retries == 10000)
 107                 DRM_ERROR("timed out waitin for SAT update %d\n", primary->offset);
 108
 109         /* MTP 16 ? */
 110         return 0;
 111 }
 112
 113 static int radeon_dp_mst_update_stream_attribs(struct radeon_connector *mst_conn,
 114                                                struct radeon_encoder *primary)
 115 {
 116         struct drm_device *dev = mst_conn->base.dev;
 117         struct stream_attribs new_attribs[6];
 118         int i;
 119         int idx = 0;
 120         struct radeon_connector *radeon_connector;
 121         struct drm_connector *connector;
 122
 123         memset(new_attribs, 0, sizeof(new_attribs));
 124         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 125                 struct radeon_encoder *subenc;
 126                 struct radeon_encoder_mst *mst_enc;
 127
 128                 radeon_connector = to_radeon_connector(connector);
 129                 if (!radeon_connector->is_mst_connector)
 130                         continue;
 131
 132                 if (radeon_connector->mst_port != mst_conn)
 133                         continue;
 134
 135                 subenc = radeon_connector->mst_encoder;
 136                 mst_enc = subenc->enc_priv;
 137
 138                 if (!mst_enc->enc_active)
 139                         continue;
 140
 141                 new_attribs[idx].fe = mst_enc->fe;
 142                 new_attribs[idx].slots = drm_dp_mst_get_vcpi_slots(&mst_conn->mst_mgr, mst_enc->port);
 143                 idx++;
 144         }
 145
 146         for (i = 0; i < idx; i++) {
 147                 if (new_attribs[i].fe != mst_conn->cur_stream_attribs[i].fe ||
 148                     new_attribs[i].slots != mst_conn->cur_stream_attribs[i].slots) {
 149                         radeon_dp_mst_set_stream_attrib(primary, i, new_attribs[i].fe, new_attribs[i].slots);
 150                         mst_conn->cur_stream_attribs[i].fe = new_attribs[i].fe;
 151                         mst_conn->cur_stream_attribs[i].slots = new_attribs[i].slots;
 152                 }
 153         }
 154
 155         for (i = idx; i < mst_conn->enabled_attribs; i++) {
 156                 radeon_dp_mst_set_stream_attrib(primary, i, 0, 0);
 157                 mst_conn->cur_stream_attribs[i].fe = 0;
 158                 mst_conn->cur_stream_attribs[i].slots = 0;
 159         }
 160         mst_conn->enabled_attribs = idx;
 161         return 0;
 162 }
 163
 164 static int radeon_dp_mst_set_vcp_size(struct radeon_encoder *mst, s64 avg_time_slots_per_mtp)
 165 {
 166         struct drm_device *dev = mst->base.dev;
 167         struct radeon_device *rdev = dev->dev_private;
 168         struct radeon_encoder_mst *mst_enc = mst->enc_priv;
 169         uint32_t val, temp;
 170         uint32_t offset = radeon_atom_set_enc_offset(mst_enc->fe);
 171         int retries = 0;
 172         uint32_t x = drm_fixp2int(avg_time_slots_per_mtp);
 173         uint32_t y = drm_fixp2int_ceil((avg_time_slots_per_mtp - x) << 26);
 174
 175         val = NI_DP_MSE_RATE_X(x) | NI_DP_MSE_RATE_Y(y);
 176
 177         WREG32(NI_DP_MSE_RATE_CNTL + offset, val);
 178
 179         do {
 180                 temp = RREG32(NI_DP_MSE_RATE_UPDATE + offset);
 181                 udelay(10);
 182         } while ((temp & 0x1) && (retries++ < 10000));
 183
 184         if (retries >= 10000)
 185                 DRM_ERROR("timed out wait for rate cntl %d\n", mst_enc->fe);
 186         return 0;
 187 }
 188
 189 static int radeon_dp_mst_get_ddc_modes(struct drm_connector *connector)
 190 {
 191         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 192         struct radeon_connector *master = radeon_connector->mst_port;
 193         struct edid *edid;
 194         int ret = 0;
 195
 196         edid = drm_dp_mst_get_edid(connector, &master->mst_mgr, radeon_connector->port);
 197         radeon_connector->edid = edid;
 198         DRM_DEBUG_KMS("edid retrieved %p\n", edid);
 199         if (radeon_connector->edid) {
 200                 drm_connector_update_edid_property(&radeon_connector->base, radeon_connector->edid);
 201                 ret = drm_add_edid_modes(&radeon_connector->base, radeon_connector->edid);
 202                 return ret;
 203         }
 204         drm_connector_update_edid_property(&radeon_connector->base, NULL);
 205
 206         return ret;
 207 }
 208
 209 static int radeon_dp_mst_get_modes(struct drm_connector *connector)
 210 {
 211         return radeon_dp_mst_get_ddc_modes(connector);
 212 }
 213
 214 static enum drm_mode_status
 215 radeon_dp_mst_mode_valid(struct drm_connector *connector,
 216                         struct drm_display_mode *mode)
 217 {
 218         /* TODO - validate mode against available PBN for link */
 219         if (mode->clock < 10000)
 220                 return MODE_CLOCK_LOW;
 221
 222         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 223                 return MODE_H_ILLEGAL;
 224
 225         return MODE_OK;
 226 }
 227
 228 static struct
 229 drm_encoder *radeon_mst_best_encoder(struct drm_connector *connector)
 230 {
 231         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 232
 233         return &radeon_connector->mst_encoder->base;
 234 }
 235
 236 static int
 237 radeon_dp_mst_detect(struct drm_connector *connector,
 238                      struct drm_modeset_acquire_ctx *ctx,
 239                      bool force)
 240 {
 241         struct radeon_connector *radeon_connector =
 242                 to_radeon_connector(connector);
 243         struct radeon_connector *master = radeon_connector->mst_port;
 244
 245         return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
 246                                       radeon_connector->port);
 247 }
 248
 249 static const struct drm_connector_helper_funcs radeon_dp_mst_connector_helper_funcs = {
 250         .get_modes = radeon_dp_mst_get_modes,
 251         .mode_valid = radeon_dp_mst_mode_valid,
 252         .best_encoder = radeon_mst_best_encoder,
 253         .detect_ctx = radeon_dp_mst_detect,
 254 };
 255
 256 static void
 257 radeon_dp_mst_connector_destroy(struct drm_connector *connector)
 258 {
 259         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 260         struct radeon_encoder *radeon_encoder = radeon_connector->mst_encoder;
 261
 262         drm_encoder_cleanup(&radeon_encoder->base);
 263         kfree(radeon_encoder);
 264         drm_connector_cleanup(connector);
 265         kfree(radeon_connector);
 266 }
 267
 268 static const struct drm_connector_funcs radeon_dp_mst_connector_funcs = {
 269         .dpms = drm_helper_connector_dpms,
 270         .fill_modes = drm_helper_probe_single_connector_modes,
 271         .destroy = radeon_dp_mst_connector_destroy,
 272 };
 273
 274 static struct drm_connector *radeon_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 275                                                          struct drm_dp_mst_port *port,
 276                                                          const char *pathprop)
 277 {
 278         struct radeon_connector *master = container_of(mgr, struct radeon_connector, mst_mgr);
 279         struct drm_device *dev = master->base.dev;
 280         struct radeon_connector *radeon_connector;
 281         struct drm_connector *connector;
 282
 283         radeon_connector = kzalloc(sizeof(*radeon_connector), GFP_KERNEL);
 284         if (!radeon_connector)
 285                 return NULL;
 286
 287         radeon_connector->is_mst_connector = true;
 288         connector = &radeon_connector->base;
 289         radeon_connector->port = port;
 290         radeon_connector->mst_port = master;
 291         DRM_DEBUG_KMS("\n");
 292
 293         drm_connector_init(dev, connector, &radeon_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
 294         drm_connector_helper_add(connector, &radeon_dp_mst_connector_helper_funcs);
 295         radeon_connector->mst_encoder = radeon_dp_create_fake_mst_encoder(master);
 296
 297         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
 298         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
 299         drm_connector_set_path_property(connector, pathprop);
 300
 301         return connector;
 302 }
 303
 304 static const struct drm_dp_mst_topology_cbs mst_cbs = {
 305         .add_connector = radeon_dp_add_mst_connector,
 306 };
 307
 308 static struct
 309 radeon_connector *radeon_mst_find_connector(struct drm_encoder *encoder)
 310 {
 311         struct drm_device *dev = encoder->dev;
 312         struct drm_connector *connector;
 313
 314         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 315                 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 316                 if (!connector->encoder)
 317                         continue;
 318                 if (!radeon_connector->is_mst_connector)
 319                         continue;
 320
 321                 DRM_DEBUG_KMS("checking %p vs %p\n", connector->encoder, encoder);
 322                 if (connector->encoder == encoder)
 323                         return radeon_connector;
 324         }
 325         return NULL;
 326 }
 327
 328 void radeon_dp_mst_prepare_pll(struct drm_crtc *crtc, struct drm_display_mode *mode)
 329 {
 330         struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
 331         struct drm_device *dev = crtc->dev;
 332         struct radeon_device *rdev = dev->dev_private;
 333         struct radeon_encoder *radeon_encoder = to_radeon_encoder(radeon_crtc->encoder);
 334         struct radeon_encoder_mst *mst_enc = radeon_encoder->enc_priv;
 335         struct radeon_connector *radeon_connector = radeon_mst_find_connector(&radeon_encoder->base);
 336         int dp_clock;
 337         struct radeon_connector_atom_dig *dig_connector = mst_enc->connector->con_priv;
 338
 339         if (radeon_connector) {
 340                 radeon_connector->pixelclock_for_modeset = mode->clock;
 341                 if (radeon_connector->base.display_info.bpc)
 342                         radeon_crtc->bpc = radeon_connector->base.display_info.bpc;
 343                 else
 344                         radeon_crtc->bpc = 8;
 345         }
 346
 347         DRM_DEBUG_KMS("dp_clock %p %d\n", dig_connector, dig_connector->dp_clock);
 348         dp_clock = dig_connector->dp_clock;
 349         radeon_crtc->ss_enabled =
 350                 radeon_atombios_get_asic_ss_info(rdev, &radeon_crtc->ss,
 351                                                  ASIC_INTERNAL_SS_ON_DP,
 352                                                  dp_clock);
 353 }
 354
 355 static void
 356 radeon_mst_encoder_dpms(struct drm_encoder *encoder, int mode)
 357 {
 358         struct drm_device *dev = encoder->dev;
 359         struct radeon_device *rdev = dev->dev_private;
 360         struct radeon_encoder *radeon_encoder, *primary;
 361         struct radeon_encoder_mst *mst_enc;
 362         struct radeon_encoder_atom_dig *dig_enc;
 363         struct radeon_connector *radeon_connector;
 364         struct drm_crtc *crtc;
 365         struct radeon_crtc *radeon_crtc;
 366         int slots;
 367         s64 fixed_pbn, fixed_pbn_per_slot, avg_time_slots_per_mtp;
 368         if (!ASIC_IS_DCE5(rdev)) {
 369                 DRM_ERROR("got mst dpms on non-DCE5\n");
 370                 return;
 371         }
 372
 373         radeon_connector = radeon_mst_find_connector(encoder);
 374         if (!radeon_connector)
 375                 return;
 376
 377         radeon_encoder = to_radeon_encoder(encoder);
 378
 379         mst_enc = radeon_encoder->enc_priv;
 380
 381         primary = mst_enc->primary;
 382
 383         dig_enc = primary->enc_priv;
 384
 385         crtc = encoder->crtc;
 386         DRM_DEBUG_KMS("got connector %d\n", dig_enc->active_mst_links);
 387
 388         switch (mode) {
 389         case DRM_MODE_DPMS_ON:
 390                 dig_enc->active_mst_links++;
 391
 392                 radeon_crtc = to_radeon_crtc(crtc);
 393
 394                 if (dig_enc->active_mst_links == 1) {
 395                         mst_enc->fe = dig_enc->dig_encoder;
 396                         mst_enc->fe_from_be = true;
 397                         atombios_set_mst_encoder_crtc_source(encoder, mst_enc->fe);
 398
 399                         atombios_dig_encoder_setup(&primary->base, ATOM_ENCODER_CMD_SETUP, 0);
 400                         atombios_dig_transmitter_setup2(&primary->base, ATOM_TRANSMITTER_ACTION_ENABLE,
 401                                                         0, 0, dig_enc->dig_encoder);
 402
 403                         if (radeon_dp_needs_link_train(mst_enc->connector) ||
 404                             dig_enc->active_mst_links == 1) {
 405                                 radeon_dp_link_train(&primary->base, &mst_enc->connector->base);
 406                         }
 407
 408                 } else {
 409                         mst_enc->fe = radeon_atom_pick_dig_encoder(encoder, radeon_crtc->crtc_id);
 410                         if (mst_enc->fe == -1)
 411                                 DRM_ERROR("failed to get frontend for dig encoder\n");
 412                         mst_enc->fe_from_be = false;
 413                         atombios_set_mst_encoder_crtc_source(encoder, mst_enc->fe);
 414                 }
 415
 416                 DRM_DEBUG_KMS("dig encoder is %d %d %d\n", dig_enc->dig_encoder,
 417                               dig_enc->linkb, radeon_crtc->crtc_id);
 418
 419                 slots = drm_dp_find_vcpi_slots(&radeon_connector->mst_port->mst_mgr,
 420                                                mst_enc->pbn);
 421                 drm_dp_mst_allocate_vcpi(&radeon_connector->mst_port->mst_mgr,
 422                                          radeon_connector->port,
 423                                          mst_enc->pbn, slots);
 424                 drm_dp_update_payload_part1(&radeon_connector->mst_port->mst_mgr);
 425
 426                 radeon_dp_mst_set_be_cntl(primary, mst_enc,
 427                                           radeon_connector->mst_port->hpd.hpd, true);
 428
 429                 mst_enc->enc_active = true;
 430                 radeon_dp_mst_update_stream_attribs(radeon_connector->mst_port, primary);
 431
 432                 fixed_pbn = drm_int2fixp(mst_enc->pbn);
 433                 fixed_pbn_per_slot = drm_int2fixp(radeon_connector->mst_port->mst_mgr.pbn_div);
 434                 avg_time_slots_per_mtp = drm_fixp_div(fixed_pbn, fixed_pbn_per_slot);
 435                 radeon_dp_mst_set_vcp_size(radeon_encoder, avg_time_slots_per_mtp);
 436
 437                 atombios_dig_encoder_setup2(&primary->base, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0,
 438                                             mst_enc->fe);
 439                 drm_dp_check_act_status(&radeon_connector->mst_port->mst_mgr);
 440
 441                 drm_dp_update_payload_part2(&radeon_connector->mst_port->mst_mgr);
 442
 443                 break;
 444         case DRM_MODE_DPMS_STANDBY:
 445         case DRM_MODE_DPMS_SUSPEND:
 446         case DRM_MODE_DPMS_OFF:
 447                 DRM_ERROR("DPMS OFF %d\n", dig_enc->active_mst_links);
 448
 449                 if (!mst_enc->enc_active)
 450                         return;
 451
 452                 drm_dp_mst_reset_vcpi_slots(&radeon_connector->mst_port->mst_mgr, mst_enc->port);
 453                 drm_dp_update_payload_part1(&radeon_connector->mst_port->mst_mgr);
 454
 455                 drm_dp_check_act_status(&radeon_connector->mst_port->mst_mgr);
 456                 /* and this can also fail */
 457                 drm_dp_update_payload_part2(&radeon_connector->mst_port->mst_mgr);
 458
 459                 drm_dp_mst_deallocate_vcpi(&radeon_connector->mst_port->mst_mgr, mst_enc->port);
 460
 461                 mst_enc->enc_active = false;
 462                 radeon_dp_mst_update_stream_attribs(radeon_connector->mst_port, primary);
 463
 464                 radeon_dp_mst_set_be_cntl(primary, mst_enc,
 465                                           radeon_connector->mst_port->hpd.hpd, false);
 466                 atombios_dig_encoder_setup2(&primary->base, ATOM_ENCODER_CMD_DP_VIDEO_OFF, 0,
 467                                             mst_enc->fe);
 468
 469                 if (!mst_enc->fe_from_be)
 470                         radeon_atom_release_dig_encoder(rdev, mst_enc->fe);
 471
 472                 mst_enc->fe_from_be = false;
 473                 dig_enc->active_mst_links--;
 474                 if (dig_enc->active_mst_links == 0) {
 475                         /* drop link */
 476                 }
 477
 478                 break;
 479         }
 480
 481 }
 482
 483 static bool radeon_mst_mode_fixup(struct drm_encoder *encoder,
 484                                    const struct drm_display_mode *mode,
 485                                    struct drm_display_mode *adjusted_mode)
 486 {
 487         struct radeon_encoder_mst *mst_enc;
 488         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 489         struct radeon_connector_atom_dig *dig_connector;
 490         int bpp = 24;
 491
 492         mst_enc = radeon_encoder->enc_priv;
 493
 494         mst_enc->pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp, false);
 495
 496         mst_enc->primary->active_device = mst_enc->primary->devices & mst_enc->connector->devices;
 497         DRM_DEBUG_KMS("setting active device to %08x from %08x %08x for encoder %d\n",
 498                       mst_enc->primary->active_device, mst_enc->primary->devices,
 499                       mst_enc->connector->devices, mst_enc->primary->base.encoder_type);
 500
 501
 502         drm_mode_set_crtcinfo(adjusted_mode, 0);
 503         dig_connector = mst_enc->connector->con_priv;
 504         dig_connector->dp_lane_count = drm_dp_max_lane_count(dig_connector->dpcd);
 505         dig_connector->dp_clock = drm_dp_max_link_rate(dig_connector->dpcd);
 506         DRM_DEBUG_KMS("dig clock %p %d %d\n", dig_connector,
 507                       dig_connector->dp_lane_count, dig_connector->dp_clock);
 508         return true;
 509 }
 510
 511 static void radeon_mst_encoder_prepare(struct drm_encoder *encoder)
 512 {
 513         struct radeon_connector *radeon_connector;
 514         struct radeon_encoder *radeon_encoder, *primary;
 515         struct radeon_encoder_mst *mst_enc;
 516         struct radeon_encoder_atom_dig *dig_enc;
 517
 518         radeon_connector = radeon_mst_find_connector(encoder);
 519         if (!radeon_connector) {
 520                 DRM_DEBUG_KMS("failed to find connector %p\n", encoder);
 521                 return;
 522         }
 523         radeon_encoder = to_radeon_encoder(encoder);
 524
 525         radeon_mst_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 526
 527         mst_enc = radeon_encoder->enc_priv;
 528
 529         primary = mst_enc->primary;
 530
 531         dig_enc = primary->enc_priv;
 532
 533         mst_enc->port = radeon_connector->port;
 534
 535         if (dig_enc->dig_encoder == -1) {
 536                 dig_enc->dig_encoder = radeon_atom_pick_dig_encoder(&primary->base, -1);
 537                 primary->offset = radeon_atom_set_enc_offset(dig_enc->dig_encoder);
 538                 atombios_set_mst_encoder_crtc_source(encoder, dig_enc->dig_encoder);
 539
 540
 541         }
 542         DRM_DEBUG_KMS("%d %d\n", dig_enc->dig_encoder, primary->offset);
 543 }
 544
 545 static void
 546 radeon_mst_encoder_mode_set(struct drm_encoder *encoder,
 547                              struct drm_display_mode *mode,
 548                              struct drm_display_mode *adjusted_mode)
 549 {
 550         DRM_DEBUG_KMS("\n");
 551 }
 552
 553 static void radeon_mst_encoder_commit(struct drm_encoder *encoder)
 554 {
 555         radeon_mst_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 556         DRM_DEBUG_KMS("\n");
 557 }
 558
 559 static const struct drm_encoder_helper_funcs radeon_mst_helper_funcs = {
 560         .dpms = radeon_mst_encoder_dpms,
 561         .mode_fixup = radeon_mst_mode_fixup,
 562         .prepare = radeon_mst_encoder_prepare,
 563         .mode_set = radeon_mst_encoder_mode_set,
 564         .commit = radeon_mst_encoder_commit,
 565 };
 566
 567 static void radeon_dp_mst_encoder_destroy(struct drm_encoder *encoder)
 568 {
 569         drm_encoder_cleanup(encoder);
 570         kfree(encoder);
 571 }
 572
 573 static const struct drm_encoder_funcs radeon_dp_mst_enc_funcs = {
 574         .destroy = radeon_dp_mst_encoder_destroy,
 575 };
 576
 577 static struct radeon_encoder *
 578 radeon_dp_create_fake_mst_encoder(struct radeon_connector *connector)
 579 {
 580         struct drm_device *dev = connector->base.dev;
 581         struct radeon_device *rdev = dev->dev_private;
 582         struct radeon_encoder *radeon_encoder;
 583         struct radeon_encoder_mst *mst_enc;
 584         struct drm_encoder *encoder;
 585         const struct drm_connector_helper_funcs *connector_funcs = connector->base.helper_private;
 586         struct drm_encoder *enc_master = connector_funcs->best_encoder(&connector->base);
 587
 588         DRM_DEBUG_KMS("enc master is %p\n", enc_master);
 589         radeon_encoder = kzalloc(sizeof(*radeon_encoder), GFP_KERNEL);
 590         if (!radeon_encoder)
 591                 return NULL;
 592
 593         radeon_encoder->enc_priv = kzalloc(sizeof(*mst_enc), GFP_KERNEL);
 594         if (!radeon_encoder->enc_priv) {
 595                 kfree(radeon_encoder);
 596                 return NULL;
 597         }
 598         encoder = &radeon_encoder->base;
 599         switch (rdev->num_crtc) {
 600         case 1:
 601                 encoder->possible_crtcs = 0x1;
 602                 break;
 603         case 2:
 604         default:
 605                 encoder->possible_crtcs = 0x3;
 606                 break;
 607         case 4:
 608                 encoder->possible_crtcs = 0xf;
 609                 break;
 610         case 6:
 611                 encoder->possible_crtcs = 0x3f;
 612                 break;
 613         }
 614
 615         drm_encoder_init(dev, &radeon_encoder->base, &radeon_dp_mst_enc_funcs,
 616                          DRM_MODE_ENCODER_DPMST, NULL);
 617         drm_encoder_helper_add(encoder, &radeon_mst_helper_funcs);
 618
 619         mst_enc = radeon_encoder->enc_priv;
 620         mst_enc->connector = connector;
 621         mst_enc->primary = to_radeon_encoder(enc_master);
 622         radeon_encoder->is_mst_encoder = true;
 623         return radeon_encoder;
 624 }
 625
 626 int
 627 radeon_dp_mst_init(struct radeon_connector *radeon_connector)
 628 {
 629         struct drm_device *dev = radeon_connector->base.dev;
 630
 631         if (!radeon_connector->ddc_bus->has_aux)
 632                 return 0;
 633
 634         radeon_connector->mst_mgr.cbs = &mst_cbs;
 635         return drm_dp_mst_topology_mgr_init(&radeon_connector->mst_mgr, dev,
 636                                             &radeon_connector->ddc_bus->aux, 16, 6,
 637                                             radeon_connector->base.base.id);
 638 }
 639
 640 int
 641 radeon_dp_mst_probe(struct radeon_connector *radeon_connector)
 642 {
 643         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 644         struct drm_device *dev = radeon_connector->base.dev;
 645         struct radeon_device *rdev = dev->dev_private;
 646         int ret;
 647         u8 msg[1];
 648
 649         if (!radeon_mst)
 650                 return 0;
 651
 652         if (!ASIC_IS_DCE5(rdev))
 653                 return 0;
 654
 655         if (dig_connector->dpcd[DP_DPCD_REV] < 0x12)
 656                 return 0;
 657
 658         ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_MSTM_CAP, msg,
 659                                1);
 660         if (ret) {
 661                 if (msg[0] & DP_MST_CAP) {
 662                         DRM_DEBUG_KMS("Sink is MST capable\n");
 663                         dig_connector->is_mst = true;
 664                 } else {
 665                         DRM_DEBUG_KMS("Sink is not MST capable\n");
 666                         dig_connector->is_mst = false;
 667                 }
 668
 669         }
 670         drm_dp_mst_topology_mgr_set_mst(&radeon_connector->mst_mgr,
 671                                         dig_connector->is_mst);
 672         return dig_connector->is_mst;
 673 }
 674
 675 int
 676 radeon_dp_mst_check_status(struct radeon_connector *radeon_connector)
 677 {
 678         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 679         int retry;
 680
 681         if (dig_connector->is_mst) {
 682                 u8 esi[16] = { 0 };
 683                 int dret;
 684                 int ret = 0;
 685                 bool handled;
 686
 687                 dret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux,
 688                                        DP_SINK_COUNT_ESI, esi, 8);
 689 go_again:
 690                 if (dret == 8) {
 691                         DRM_DEBUG_KMS("got esi %3ph\n", esi);
 692                         ret = drm_dp_mst_hpd_irq(&radeon_connector->mst_mgr, esi, &handled);
 693
 694                         if (handled) {
 695                                 for (retry = 0; retry < 3; retry++) {
 696                                         int wret;
 697                                         wret = drm_dp_dpcd_write(&radeon_connector->ddc_bus->aux,
 698                                                                  DP_SINK_COUNT_ESI + 1, &esi[1], 3);
 699                                         if (wret == 3)
 700                                                 break;
 701                                 }
 702
 703                                 dret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux,
 704                                                         DP_SINK_COUNT_ESI, esi, 8);
 705                                 if (dret == 8) {
 706                                         DRM_DEBUG_KMS("got esi2 %3ph\n", esi);
 707                                         goto go_again;
 708                                 }
 709                         } else
 710                                 ret = 0;
 711
 712                         return ret;
 713                 } else {
 714                         DRM_DEBUG_KMS("failed to get ESI - device may have failed %d\n", ret);
 715                         dig_connector->is_mst = false;
 716                         drm_dp_mst_topology_mgr_set_mst(&radeon_connector->mst_mgr,
 717                                                         dig_connector->is_mst);
 718                         /* send a hotplug event */
 719                 }
 720         }
 721         return -EINVAL;
 722 }
 723
 724 #if defined(CONFIG_DEBUG_FS)
 725
 726 static int radeon_debugfs_mst_info(struct seq_file *m, void *data)
 727 {
 728         struct drm_info_node *node = (struct drm_info_node *)m->private;
 729         struct drm_device *dev = node->minor->dev;
 730         struct drm_connector *connector;
 731         struct radeon_connector *radeon_connector;
 732         struct radeon_connector_atom_dig *dig_connector;
 733         int i;
 734
 735         drm_modeset_lock_all(dev);
 736         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 737                 if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
 738                         continue;
 739
 740                 radeon_connector = to_radeon_connector(connector);
 741                 dig_connector = radeon_connector->con_priv;
 742                 if (radeon_connector->is_mst_connector)
 743                         continue;
 744                 if (!dig_connector->is_mst)
 745                         continue;
 746                 drm_dp_mst_dump_topology(m, &radeon_connector->mst_mgr);
 747
 748                 for (i = 0; i < radeon_connector->enabled_attribs; i++)
 749                         seq_printf(m, "attrib %d: %d %d\n", i,
 750                                    radeon_connector->cur_stream_attribs[i].fe,
 751                                    radeon_connector->cur_stream_attribs[i].slots);
 752         }
 753         drm_modeset_unlock_all(dev);
 754         return 0;
 755 }
 756
 757 static struct drm_info_list radeon_debugfs_mst_list[] = {
 758         {"radeon_mst_info", &radeon_debugfs_mst_info, 0, NULL},
 759 };
 760 #endif
 761
 762 int radeon_mst_debugfs_init(struct radeon_device *rdev)
 763 {
 764 #if defined(CONFIG_DEBUG_FS)
 765         return radeon_debugfs_add_files(rdev, radeon_debugfs_mst_list, 1);
 766 #endif
 767         return 0;
 768 }