drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

   1 /*
   2  * Copyright 2012-15 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: AMD
  23  *
  24  */
  25
  26 #include <linux/version.h>
  27 #include <drm/drm_atomic_helper.h>
  28 #include <drm/drm_dp_mst_helper.h>
  29 #include <drm/drm_dp_helper.h>
  30 #include "dm_services.h"
  31 #include "amdgpu.h"
  32 #include "amdgpu_dm.h"
  33 #include "amdgpu_dm_mst_types.h"
  34
  35 #include "dc.h"
  36 #include "dm_helpers.h"
  37
  38 #include "dc_link_ddc.h"
  39
  40 #include "i2caux_interface.h"
  41 #if defined(CONFIG_DEBUG_FS)
  42 #include "amdgpu_dm_debugfs.h"
  43 #endif
  44
  45 #if defined(CONFIG_DRM_AMD_DC_DCN)
  46 #include "dc/dcn20/dcn20_resource.h"
  47 #endif
  48
  49 static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
  50                                   struct drm_dp_aux_msg *msg)
  51 {
  52         ssize_t result = 0;
  53         struct aux_payload payload;
  54         enum aux_channel_operation_result operation_result;
  55
  56         if (WARN_ON(msg->size > 16))
  57                 return -E2BIG;
  58
  59         payload.address = msg->address;
  60         payload.data = msg->buffer;
  61         payload.length = msg->size;
  62         payload.reply = &msg->reply;
  63         payload.i2c_over_aux = (msg->request & DP_AUX_NATIVE_WRITE) == 0;
  64         payload.write = (msg->request & DP_AUX_I2C_READ) == 0;
  65         payload.mot = (msg->request & DP_AUX_I2C_MOT) != 0;
  66         payload.defer_delay = 0;
  67
  68         result = dc_link_aux_transfer_raw(TO_DM_AUX(aux)->ddc_service, &payload,
  69                                       &operation_result);
  70
  71         if (payload.write && result >= 0)
  72                 result = msg->size;
  73
  74         if (result < 0)
  75                 switch (operation_result) {
  76                 case AUX_CHANNEL_OPERATION_SUCCEEDED:
  77                         break;
  78                 case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON:
  79                 case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN:
  80                         result = -EIO;
  81                         break;
  82                 case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY:
  83                 case AUX_CHANNEL_OPERATION_FAILED_ENGINE_ACQUIRE:
  84                         result = -EBUSY;
  85                         break;
  86                 case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT:
  87                         result = -ETIMEDOUT;
  88                         break;
  89                 }
  90
  91         return result;
  92 }
  93
  94 static void
  95 dm_dp_mst_connector_destroy(struct drm_connector *connector)
  96 {
  97         struct amdgpu_dm_connector *aconnector =
  98                 to_amdgpu_dm_connector(connector);
  99
 100         if (aconnector->dc_sink) {
 101                 dc_link_remove_remote_sink(aconnector->dc_link,
 102                                            aconnector->dc_sink);
 103                 dc_sink_release(aconnector->dc_sink);
 104         }
 105
 106         kfree(aconnector->edid);
 107
 108         drm_connector_cleanup(connector);
 109         drm_dp_mst_put_port_malloc(aconnector->port);
 110         kfree(aconnector);
 111 }
 112
 113 static int
 114 amdgpu_dm_mst_connector_late_register(struct drm_connector *connector)
 115 {
 116         struct amdgpu_dm_connector *amdgpu_dm_connector =
 117                 to_amdgpu_dm_connector(connector);
 118         int r;
 119
 120         r = drm_dp_mst_connector_late_register(connector,
 121                                                amdgpu_dm_connector->port);
 122         if (r < 0)
 123                 return r;
 124
 125 #if defined(CONFIG_DEBUG_FS)
 126         connector_debugfs_init(amdgpu_dm_connector);
 127 #endif
 128
 129         return 0;
 130 }
 131
 132 static void
 133 amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector)
 134 {
 135         struct amdgpu_dm_connector *amdgpu_dm_connector =
 136                 to_amdgpu_dm_connector(connector);
 137         struct drm_dp_mst_port *port = amdgpu_dm_connector->port;
 138
 139         drm_dp_mst_connector_early_unregister(connector, port);
 140 }
 141
 142 static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
 143         .fill_modes = drm_helper_probe_single_connector_modes,
 144         .destroy = dm_dp_mst_connector_destroy,
 145         .reset = amdgpu_dm_connector_funcs_reset,
 146         .atomic_duplicate_state = amdgpu_dm_connector_atomic_duplicate_state,
 147         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 148         .atomic_set_property = amdgpu_dm_connector_atomic_set_property,
 149         .atomic_get_property = amdgpu_dm_connector_atomic_get_property,
 150         .late_register = amdgpu_dm_mst_connector_late_register,
 151         .early_unregister = amdgpu_dm_mst_connector_early_unregister,
 152 };
 153
 154 #if defined(CONFIG_DRM_AMD_DC_DCN)
 155 static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnector)
 156 {
 157         struct dc_sink *dc_sink = aconnector->dc_sink;
 158         struct drm_dp_mst_port *port = aconnector->port;
 159         u8 dsc_caps[16] = { 0 };
 160
 161         aconnector->dsc_aux = drm_dp_mst_dsc_aux_for_port(port);
 162 #if defined(CONFIG_HP_HOOK_WORKAROUND)
 163         /*
 164          * drm_dp_mst_dsc_aux_for_port() will return NULL for certain configs
 165          * because it only check the dsc/fec caps of the "port variable" and not the dock
 166          *
 167          * This case will return NULL: DSC capabe MST dock connected to a non fec/dsc capable display
 168          *
 169          * Workaround: explicitly check the use case above and use the mst dock's aux as dsc_aux
 170          *
 171          */
 172
 173         if (!aconnector->dsc_aux && !port->parent->port_parent)
 174                 aconnector->dsc_aux = &aconnector->mst_port->dm_dp_aux.aux;
 175 #endif
 176         if (!aconnector->dsc_aux)
 177                 return false;
 178
 179         if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DSC_SUPPORT, dsc_caps, 16) < 0)
 180                 return false;
 181
 182         if (!dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,
 183                                    dsc_caps, NULL,
 184                                    &dc_sink->dsc_caps.dsc_dec_caps))
 185                 return false;
 186
 187         return true;
 188 }
 189 #endif
 190
 191 static int dm_dp_mst_get_modes(struct drm_connector *connector)
 192 {
 193         struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 194         int ret = 0;
 195
 196         if (!aconnector)
 197                 return drm_add_edid_modes(connector, NULL);
 198
 199         if (!aconnector->edid) {
 200                 struct edid *edid;
 201                 edid = drm_dp_mst_get_edid(connector, &aconnector->mst_port->mst_mgr, aconnector->port);
 202
 203                 if (!edid) {
 204                         drm_connector_update_edid_property(
 205                                 &aconnector->base,
 206                                 NULL);
 207                         return ret;
 208                 }
 209
 210                 aconnector->edid = edid;
 211         }
 212
 213         if (aconnector->dc_sink && aconnector->dc_sink->sink_signal == SIGNAL_TYPE_VIRTUAL) {
 214                 dc_sink_release(aconnector->dc_sink);
 215                 aconnector->dc_sink = NULL;
 216         }
 217
 218         if (!aconnector->dc_sink) {
 219                 struct dc_sink *dc_sink;
 220                 struct dc_sink_init_data init_params = {
 221                                 .link = aconnector->dc_link,
 222                                 .sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
 223                 dc_sink = dc_link_add_remote_sink(
 224                         aconnector->dc_link,
 225                         (uint8_t *)aconnector->edid,
 226                         (aconnector->edid->extensions + 1) * EDID_LENGTH,
 227                         &init_params);
 228
 229                 dc_sink->priv = aconnector;
 230                 /* dc_link_add_remote_sink returns a new reference */
 231                 aconnector->dc_sink = dc_sink;
 232
 233                 if (aconnector->dc_sink) {
 234                         amdgpu_dm_update_freesync_caps(
 235                                         connector, aconnector->edid);
 236
 237 #if defined(CONFIG_DRM_AMD_DC_DCN)
 238                         if (!validate_dsc_caps_on_connector(aconnector))
 239                                 memset(&aconnector->dc_sink->dsc_caps,
 240                                        0, sizeof(aconnector->dc_sink->dsc_caps));
 241 #endif
 242                 }
 243         }
 244
 245         drm_connector_update_edid_property(
 246                                         &aconnector->base, aconnector->edid);
 247
 248         ret = drm_add_edid_modes(connector, aconnector->edid);
 249
 250         return ret;
 251 }
 252
 253 static struct drm_encoder *
 254 dm_mst_atomic_best_encoder(struct drm_connector *connector,
 255                            struct drm_connector_state *connector_state)
 256 {
 257         struct drm_device *dev = connector->dev;
 258         struct amdgpu_device *adev = drm_to_adev(dev);
 259         struct amdgpu_crtc *acrtc = to_amdgpu_crtc(connector_state->crtc);
 260
 261         return &adev->dm.mst_encoders[acrtc->crtc_id].base;
 262 }
 263
 264 static int
 265 dm_dp_mst_detect(struct drm_connector *connector,
 266                  struct drm_modeset_acquire_ctx *ctx, bool force)
 267 {
 268         struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 269         struct amdgpu_dm_connector *master = aconnector->mst_port;
 270
 271         return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
 272                                       aconnector->port);
 273 }
 274
 275 static int dm_dp_mst_atomic_check(struct drm_connector *connector,
 276                                 struct drm_atomic_state *state)
 277 {
 278         struct drm_connector_state *new_conn_state =
 279                         drm_atomic_get_new_connector_state(state, connector);
 280         struct drm_connector_state *old_conn_state =
 281                         drm_atomic_get_old_connector_state(state, connector);
 282         struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 283         struct drm_crtc_state *new_crtc_state;
 284         struct drm_dp_mst_topology_mgr *mst_mgr;
 285         struct drm_dp_mst_port *mst_port;
 286
 287         mst_port = aconnector->port;
 288         mst_mgr = &aconnector->mst_port->mst_mgr;
 289
 290         if (!old_conn_state->crtc)
 291                 return 0;
 292
 293         if (new_conn_state->crtc) {
 294                 new_crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
 295                 if (!new_crtc_state ||
 296                     !drm_atomic_crtc_needs_modeset(new_crtc_state) ||
 297                     new_crtc_state->enable)
 298                         return 0;
 299                 }
 300
 301         return drm_dp_atomic_release_vcpi_slots(state,
 302                                                 mst_mgr,
 303                                                 mst_port);
 304 }
 305
 306 static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = {
 307         .get_modes = dm_dp_mst_get_modes,
 308         .mode_valid = amdgpu_dm_connector_mode_valid,
 309         .atomic_best_encoder = dm_mst_atomic_best_encoder,
 310         .detect_ctx = dm_dp_mst_detect,
 311         .atomic_check = dm_dp_mst_atomic_check,
 312 };
 313
 314 static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
 315 {
 316         drm_encoder_cleanup(encoder);
 317         kfree(encoder);
 318 }
 319
 320 static const struct drm_encoder_funcs amdgpu_dm_encoder_funcs = {
 321         .destroy = amdgpu_dm_encoder_destroy,
 322 };
 323
 324 void
 325 dm_dp_create_fake_mst_encoders(struct amdgpu_device *adev)
 326 {
 327         struct drm_device *dev = adev_to_drm(adev);
 328         int i;
 329
 330         for (i = 0; i < adev->dm.display_indexes_num; i++) {
 331                 struct amdgpu_encoder *amdgpu_encoder = &adev->dm.mst_encoders[i];
 332                 struct drm_encoder *encoder = &amdgpu_encoder->base;
 333
 334                 encoder->possible_crtcs = amdgpu_dm_get_encoder_crtc_mask(adev);
 335
 336                 drm_encoder_init(
 337                         dev,
 338                         &amdgpu_encoder->base,
 339                         &amdgpu_dm_encoder_funcs,
 340                         DRM_MODE_ENCODER_DPMST,
 341                         NULL);
 342
 343                 drm_encoder_helper_add(encoder, &amdgpu_dm_encoder_helper_funcs);
 344         }
 345 }
 346
 347 static struct drm_connector *
 348 dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 349                         struct drm_dp_mst_port *port,
 350                         const char *pathprop)
 351 {
 352         struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
 353         struct drm_device *dev = master->base.dev;
 354         struct amdgpu_device *adev = drm_to_adev(dev);
 355         struct amdgpu_dm_connector *aconnector;
 356         struct drm_connector *connector;
 357         int i;
 358
 359         aconnector = kzalloc(sizeof(*aconnector), GFP_KERNEL);
 360         if (!aconnector)
 361                 return NULL;
 362
 363         connector = &aconnector->base;
 364         aconnector->port = port;
 365         aconnector->mst_port = master;
 366
 367         if (drm_connector_init(
 368                 dev,
 369                 connector,
 370                 &dm_dp_mst_connector_funcs,
 371                 DRM_MODE_CONNECTOR_DisplayPort)) {
 372                 kfree(aconnector);
 373                 return NULL;
 374         }
 375         drm_connector_helper_add(connector, &dm_dp_mst_connector_helper_funcs);
 376
 377         amdgpu_dm_connector_init_helper(
 378                 &adev->dm,
 379                 aconnector,
 380                 DRM_MODE_CONNECTOR_DisplayPort,
 381                 master->dc_link,
 382                 master->connector_id);
 383
 384         for (i = 0; i < adev->dm.display_indexes_num; i++) {
 385                 drm_connector_attach_encoder(&aconnector->base,
 386                                              &adev->dm.mst_encoders[i].base);
 387         }
 388
 389         connector->max_bpc_property = master->base.max_bpc_property;
 390         if (connector->max_bpc_property)
 391                 drm_connector_attach_max_bpc_property(connector, 8, 16);
 392
 393         connector->vrr_capable_property = master->base.vrr_capable_property;
 394         if (connector->vrr_capable_property)
 395                 drm_connector_attach_vrr_capable_property(connector);
 396
 397         drm_object_attach_property(
 398                 &connector->base,
 399                 dev->mode_config.path_property,
 400                 0);
 401         drm_object_attach_property(
 402                 &connector->base,
 403                 dev->mode_config.tile_property,
 404                 0);
 405
 406         drm_connector_set_path_property(connector, pathprop);
 407
 408         /*
 409          * Initialize connector state before adding the connectror to drm and
 410          * framebuffer lists
 411          */
 412         amdgpu_dm_connector_funcs_reset(connector);
 413
 414         drm_dp_mst_get_port_malloc(port);
 415
 416         return connector;
 417 }
 418
 419 static const struct drm_dp_mst_topology_cbs dm_mst_cbs = {
 420         .add_connector = dm_dp_add_mst_connector,
 421 };
 422
 423 void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 424                                        struct amdgpu_dm_connector *aconnector,
 425                                        int link_index)
 426 {
 427         aconnector->dm_dp_aux.aux.name =
 428                 kasprintf(GFP_KERNEL, "AMDGPU DM aux hw bus %d",
 429                           link_index);
 430         aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
 431         aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;
 432
 433         drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
 434         drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
 435                                       &aconnector->base);
 436
 437         if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
 438                 return;
 439
 440         aconnector->mst_mgr.cbs = &dm_mst_cbs;
 441         drm_dp_mst_topology_mgr_init(
 442                 &aconnector->mst_mgr,
 443                 adev_to_drm(dm->adev),
 444                 &aconnector->dm_dp_aux.aux,
 445                 16,
 446                 4,
 447                 aconnector->connector_id);
 448
 449         drm_connector_attach_dp_subconnector_property(&aconnector->base);
 450 }
 451
 452 int dm_mst_get_pbn_divider(struct dc_link *link)
 453 {
 454         if (!link)
 455                 return 0;
 456
 457         return dc_link_bandwidth_kbps(link,
 458                         dc_link_get_link_cap(link)) / (8 * 1000 * 54);
 459 }
 460
 461 #if defined(CONFIG_DRM_AMD_DC_DCN)
 462
 463 struct dsc_mst_fairness_params {
 464         struct dc_crtc_timing *timing;
 465         struct dc_sink *sink;
 466         struct dc_dsc_bw_range bw_range;
 467         bool compression_possible;
 468         struct drm_dp_mst_port *port;
 469         enum dsc_clock_force_state clock_force_enable;
 470         uint32_t num_slices_h;
 471         uint32_t num_slices_v;
 472         uint32_t bpp_overwrite;
 473 };
 474
 475 struct dsc_mst_fairness_vars {
 476         int pbn;
 477         bool dsc_enabled;
 478         int bpp_x16;
 479 };
 480
 481 static int kbps_to_peak_pbn(int kbps)
 482 {
 483         u64 peak_kbps = kbps;
 484
 485         peak_kbps *= 1006;
 486         peak_kbps = div_u64(peak_kbps, 1000);
 487         return (int) DIV64_U64_ROUND_UP(peak_kbps * 64, (54 * 8 * 1000));
 488 }
 489
 490 static void set_dsc_configs_from_fairness_vars(struct dsc_mst_fairness_params *params,
 491                 struct dsc_mst_fairness_vars *vars,
 492                 int count)
 493 {
 494         int i;
 495
 496         for (i = 0; i < count; i++) {
 497                 memset(&params[i].timing->dsc_cfg, 0, sizeof(params[i].timing->dsc_cfg));
 498                 if (vars[i].dsc_enabled && dc_dsc_compute_config(
 499                                         params[i].sink->ctx->dc->res_pool->dscs[0],
 500                                         &params[i].sink->dsc_caps.dsc_dec_caps,
 501                                         params[i].sink->ctx->dc->debug.dsc_min_slice_height_override,
 502                                         0,
 503                                         params[i].timing,
 504                                         &params[i].timing->dsc_cfg)) {
 505                         params[i].timing->flags.DSC = 1;
 506
 507                         if (params[i].bpp_overwrite)
 508                                 params[i].timing->dsc_cfg.bits_per_pixel = params[i].bpp_overwrite;
 509                         else
 510                                 params[i].timing->dsc_cfg.bits_per_pixel = vars[i].bpp_x16;
 511
 512                         if (params[i].num_slices_h)
 513                                 params[i].timing->dsc_cfg.num_slices_h = params[i].num_slices_h;
 514
 515                         if (params[i].num_slices_v)
 516                                 params[i].timing->dsc_cfg.num_slices_v = params[i].num_slices_v;
 517                 } else {
 518                         params[i].timing->flags.DSC = 0;
 519                 }
 520         }
 521 }
 522
 523 static int bpp_x16_from_pbn(struct dsc_mst_fairness_params param, int pbn)
 524 {
 525         struct dc_dsc_config dsc_config;
 526         u64 kbps;
 527
 528         kbps = div_u64((u64)pbn * 994 * 8 * 54, 64);
 529         dc_dsc_compute_config(
 530                         param.sink->ctx->dc->res_pool->dscs[0],
 531                         &param.sink->dsc_caps.dsc_dec_caps,
 532                         param.sink->ctx->dc->debug.dsc_min_slice_height_override,
 533                         (int) kbps, param.timing, &dsc_config);
 534
 535         return dsc_config.bits_per_pixel;
 536 }
 537
 538 static void increase_dsc_bpp(struct drm_atomic_state *state,
 539                              struct dc_link *dc_link,
 540                              struct dsc_mst_fairness_params *params,
 541                              struct dsc_mst_fairness_vars *vars,
 542                              int count)
 543 {
 544         int i;
 545         bool bpp_increased[MAX_PIPES];
 546         int initial_slack[MAX_PIPES];
 547         int min_initial_slack;
 548         int next_index;
 549         int remaining_to_increase = 0;
 550         int pbn_per_timeslot;
 551         int link_timeslots_used;
 552         int fair_pbn_alloc;
 553
 554         pbn_per_timeslot = dm_mst_get_pbn_divider(dc_link);
 555
 556         for (i = 0; i < count; i++) {
 557                 if (vars[i].dsc_enabled) {
 558                         initial_slack[i] = kbps_to_peak_pbn(params[i].bw_range.max_kbps) - vars[i].pbn;
 559                         bpp_increased[i] = false;
 560                         remaining_to_increase += 1;
 561                 } else {
 562                         initial_slack[i] = 0;
 563                         bpp_increased[i] = true;
 564                 }
 565         }
 566
 567         while (remaining_to_increase) {
 568                 next_index = -1;
 569                 min_initial_slack = -1;
 570                 for (i = 0; i < count; i++) {
 571                         if (!bpp_increased[i]) {
 572                                 if (min_initial_slack == -1 || min_initial_slack > initial_slack[i]) {
 573                                         min_initial_slack = initial_slack[i];
 574                                         next_index = i;
 575                                 }
 576                         }
 577                 }
 578
 579                 if (next_index == -1)
 580                         break;
 581
 582                 link_timeslots_used = 0;
 583
 584                 for (i = 0; i < count; i++)
 585                         link_timeslots_used += DIV_ROUND_UP(vars[i].pbn, pbn_per_timeslot);
 586
 587                 fair_pbn_alloc = (63 - link_timeslots_used) / remaining_to_increase * pbn_per_timeslot;
 588
 589                 if (initial_slack[next_index] > fair_pbn_alloc) {
 590                         vars[next_index].pbn += fair_pbn_alloc;
 591                         if (drm_dp_atomic_find_vcpi_slots(state,
 592                                                           params[next_index].port->mgr,
 593                                                           params[next_index].port,
 594                                                           vars[next_index].pbn,
 595                                                           pbn_per_timeslot) < 0)
 596                                 return;
 597                         if (!drm_dp_mst_atomic_check(state)) {
 598                                 vars[next_index].bpp_x16 = bpp_x16_from_pbn(params[next_index], vars[next_index].pbn);
 599                         } else {
 600                                 vars[next_index].pbn -= fair_pbn_alloc;
 601                                 if (drm_dp_atomic_find_vcpi_slots(state,
 602                                                                   params[next_index].port->mgr,
 603                                                                   params[next_index].port,
 604                                                                   vars[next_index].pbn,
 605                                                                   pbn_per_timeslot) < 0)
 606                                         return;
 607                         }
 608                 } else {
 609                         vars[next_index].pbn += initial_slack[next_index];
 610                         if (drm_dp_atomic_find_vcpi_slots(state,
 611                                                           params[next_index].port->mgr,
 612                                                           params[next_index].port,
 613                                                           vars[next_index].pbn,
 614                                                           pbn_per_timeslot) < 0)
 615                                 return;
 616                         if (!drm_dp_mst_atomic_check(state)) {
 617                                 vars[next_index].bpp_x16 = params[next_index].bw_range.max_target_bpp_x16;
 618                         } else {
 619                                 vars[next_index].pbn -= initial_slack[next_index];
 620                                 if (drm_dp_atomic_find_vcpi_slots(state,
 621                                                                   params[next_index].port->mgr,
 622                                                                   params[next_index].port,
 623                                                                   vars[next_index].pbn,
 624                                                                   pbn_per_timeslot) < 0)
 625                                         return;
 626                         }
 627                 }
 628
 629                 bpp_increased[next_index] = true;
 630                 remaining_to_increase--;
 631         }
 632 }
 633
 634 static void try_disable_dsc(struct drm_atomic_state *state,
 635                             struct dc_link *dc_link,
 636                             struct dsc_mst_fairness_params *params,
 637                             struct dsc_mst_fairness_vars *vars,
 638                             int count)
 639 {
 640         int i;
 641         bool tried[MAX_PIPES];
 642         int kbps_increase[MAX_PIPES];
 643         int max_kbps_increase;
 644         int next_index;
 645         int remaining_to_try = 0;
 646
 647         for (i = 0; i < count; i++) {
 648                 if (vars[i].dsc_enabled
 649                                 && vars[i].bpp_x16 == params[i].bw_range.max_target_bpp_x16
 650                                 && !params[i].clock_force_enable == DSC_CLK_FORCE_DEFAULT) {
 651                         kbps_increase[i] = params[i].bw_range.stream_kbps - params[i].bw_range.max_kbps;
 652                         tried[i] = false;
 653                         remaining_to_try += 1;
 654                 } else {
 655                         kbps_increase[i] = 0;
 656                         tried[i] = true;
 657                 }
 658         }
 659
 660         while (remaining_to_try) {
 661                 next_index = -1;
 662                 max_kbps_increase = -1;
 663                 for (i = 0; i < count; i++) {
 664                         if (!tried[i]) {
 665                                 if (max_kbps_increase == -1 || max_kbps_increase < kbps_increase[i]) {
 666                                         max_kbps_increase = kbps_increase[i];
 667                                         next_index = i;
 668                                 }
 669                         }
 670                 }
 671
 672                 if (next_index == -1)
 673                         break;
 674
 675                 vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.stream_kbps);
 676                 if (drm_dp_atomic_find_vcpi_slots(state,
 677                                                   params[next_index].port->mgr,
 678                                                   params[next_index].port,
 679                                                   vars[next_index].pbn,
 680                                                   dm_mst_get_pbn_divider(dc_link)) < 0)
 681                         return;
 682
 683                 if (!drm_dp_mst_atomic_check(state)) {
 684                         vars[next_index].dsc_enabled = false;
 685                         vars[next_index].bpp_x16 = 0;
 686                 } else {
 687                         vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.max_kbps);
 688                         if (drm_dp_atomic_find_vcpi_slots(state,
 689                                                           params[next_index].port->mgr,
 690                                                           params[next_index].port,
 691                                                           vars[next_index].pbn,
 692                                                           dm_mst_get_pbn_divider(dc_link)) < 0)
 693                                 return;
 694                 }
 695
 696                 tried[next_index] = true;
 697                 remaining_to_try--;
 698         }
 699 }
 700
 701 static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
 702                                              struct dc_state *dc_state,
 703                                              struct dc_link *dc_link)
 704 {
 705         int i;
 706         struct dc_stream_state *stream;
 707         struct dsc_mst_fairness_params params[MAX_PIPES];
 708         struct dsc_mst_fairness_vars vars[MAX_PIPES];
 709         struct amdgpu_dm_connector *aconnector;
 710         int count = 0;
 711         bool debugfs_overwrite = false;
 712
 713         memset(params, 0, sizeof(params));
 714
 715         /* Set up params */
 716         for (i = 0; i < dc_state->stream_count; i++) {
 717                 struct dc_dsc_policy dsc_policy = {0};
 718
 719                 stream = dc_state->streams[i];
 720
 721                 if (stream->link != dc_link)
 722                         continue;
 723
 724                 stream->timing.flags.DSC = 0;
 725
 726                 params[count].timing = &stream->timing;
 727                 params[count].sink = stream->sink;
 728                 aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
 729                 params[count].port = aconnector->port;
 730                 params[count].clock_force_enable = aconnector->dsc_settings.dsc_force_enable;
 731                 if (params[count].clock_force_enable == DSC_CLK_FORCE_ENABLE)
 732                         debugfs_overwrite = true;
 733                 params[count].num_slices_h = aconnector->dsc_settings.dsc_num_slices_h;
 734                 params[count].num_slices_v = aconnector->dsc_settings.dsc_num_slices_v;
 735                 params[count].bpp_overwrite = aconnector->dsc_settings.dsc_bits_per_pixel;
 736                 params[count].compression_possible = stream->sink->dsc_caps.dsc_dec_caps.is_dsc_supported;
 737                 dc_dsc_get_policy_for_timing(params[count].timing, &dsc_policy);
 738                 if (!dc_dsc_compute_bandwidth_range(
 739                                 stream->sink->ctx->dc->res_pool->dscs[0],
 740                                 stream->sink->ctx->dc->debug.dsc_min_slice_height_override,
 741                                 dsc_policy.min_target_bpp,
 742                                 dsc_policy.max_target_bpp,
 743                                 &stream->sink->dsc_caps.dsc_dec_caps,
 744                                 &stream->timing, &params[count].bw_range))
 745                         params[count].bw_range.stream_kbps = dc_bandwidth_in_kbps_from_timing(&stream->timing);
 746
 747                 count++;
 748         }
 749         /* Try no compression */
 750         for (i = 0; i < count; i++) {
 751                 vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
 752                 vars[i].dsc_enabled = false;
 753                 vars[i].bpp_x16 = 0;
 754                 if (drm_dp_atomic_find_vcpi_slots(state,
 755                                                  params[i].port->mgr,
 756                                                  params[i].port,
 757                                                  vars[i].pbn,
 758                                                  dm_mst_get_pbn_divider(dc_link)) < 0)
 759                         return false;
 760         }
 761         if (!drm_dp_mst_atomic_check(state) && !debugfs_overwrite) {
 762                 set_dsc_configs_from_fairness_vars(params, vars, count);
 763                 return true;
 764         }
 765
 766         /* Try max compression */
 767         for (i = 0; i < count; i++) {
 768                 if (params[i].compression_possible && params[i].clock_force_enable != DSC_CLK_FORCE_DISABLE) {
 769                         vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.min_kbps);
 770                         vars[i].dsc_enabled = true;
 771                         vars[i].bpp_x16 = params[i].bw_range.min_target_bpp_x16;
 772                         if (drm_dp_atomic_find_vcpi_slots(state,
 773                                                           params[i].port->mgr,
 774                                                           params[i].port,
 775                                                           vars[i].pbn,
 776                                                           dm_mst_get_pbn_divider(dc_link)) < 0)
 777                                 return false;
 778                 } else {
 779                         vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
 780                         vars[i].dsc_enabled = false;
 781                         vars[i].bpp_x16 = 0;
 782                         if (drm_dp_atomic_find_vcpi_slots(state,
 783                                                           params[i].port->mgr,
 784                                                           params[i].port,
 785                                                           vars[i].pbn,
 786                                                           dm_mst_get_pbn_divider(dc_link)) < 0)
 787                                 return false;
 788                 }
 789         }
 790         if (drm_dp_mst_atomic_check(state))
 791                 return false;
 792
 793         /* Optimize degree of compression */
 794         increase_dsc_bpp(state, dc_link, params, vars, count);
 795
 796         try_disable_dsc(state, dc_link, params, vars, count);
 797
 798         set_dsc_configs_from_fairness_vars(params, vars, count);
 799
 800         return true;
 801 }
 802
 803 bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
 804                                        struct dc_state *dc_state)
 805 {
 806         int i, j;
 807         struct dc_stream_state *stream;
 808         bool computed_streams[MAX_PIPES];
 809         struct amdgpu_dm_connector *aconnector;
 810
 811         for (i = 0; i < dc_state->stream_count; i++)
 812                 computed_streams[i] = false;
 813
 814         for (i = 0; i < dc_state->stream_count; i++) {
 815                 stream = dc_state->streams[i];
 816
 817                 if (stream->signal != SIGNAL_TYPE_DISPLAY_PORT_MST)
 818                         continue;
 819
 820                 aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
 821
 822                 if (!aconnector || !aconnector->dc_sink)
 823                         continue;
 824
 825                 if (!aconnector->dc_sink->dsc_caps.dsc_dec_caps.is_dsc_supported)
 826                         continue;
 827
 828                 if (computed_streams[i])
 829                         continue;
 830
 831                 mutex_lock(&aconnector->mst_mgr.lock);
 832                 if (!compute_mst_dsc_configs_for_link(state, dc_state, stream->link)) {
 833                         mutex_unlock(&aconnector->mst_mgr.lock);
 834                         return false;
 835                 }
 836                 mutex_unlock(&aconnector->mst_mgr.lock);
 837
 838                 for (j = 0; j < dc_state->stream_count; j++) {
 839                         if (dc_state->streams[j]->link == stream->link)
 840                                 computed_streams[j] = true;
 841                 }
 842         }
 843
 844         for (i = 0; i < dc_state->stream_count; i++) {
 845                 stream = dc_state->streams[i];
 846
 847                 if (stream->timing.flags.DSC == 1)
 848                         dc_stream_add_dsc_to_resource(stream->ctx->dc, dc_state, stream);
 849         }
 850
 851         return true;
 852 }
 853
 854 #endif