drivers/gpu/drm/drm_client_modeset.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2018 Noralf Trønnes
   4  * Copyright (c) 2006-2009 Red Hat Inc.
   5  * Copyright (c) 2006-2008 Intel Corporation
   6  *   Jesse Barnes <[email protected]>
   7  * Copyright (c) 2007 Dave Airlie <[email protected]>
   8  */
   9
  10 #include "drm/drm_modeset_lock.h"
  11 #include <linux/module.h>
  12 #include <linux/mutex.h>
  13 #include <linux/slab.h>
  14 #include <linux/string_helpers.h>
  15
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_client.h>
  18 #include <drm/drm_connector.h>
  19 #include <drm/drm_crtc.h>
  20 #include <drm/drm_device.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_edid.h>
  23 #include <drm/drm_encoder.h>
  24 #include <drm/drm_print.h>
  25
  26 #include "drm_crtc_internal.h"
  27 #include "drm_internal.h"
  28
  29 #define DRM_CLIENT_MAX_CLONED_CONNECTORS        8
  30
  31 struct drm_client_offset {
  32         int x, y;
  33 };
  34
  35 int drm_client_modeset_create(struct drm_client_dev *client)
  36 {
  37         struct drm_device *dev = client->dev;
  38         unsigned int num_crtc = dev->mode_config.num_crtc;
  39         unsigned int max_connector_count = 1;
  40         struct drm_mode_set *modeset;
  41         struct drm_crtc *crtc;
  42         unsigned int i = 0;
  43
  44         /* Add terminating zero entry to enable index less iteration */
  45         client->modesets = kcalloc(num_crtc + 1, sizeof(*client->modesets), GFP_KERNEL);
  46         if (!client->modesets)
  47                 return -ENOMEM;
  48
  49         mutex_init(&client->modeset_mutex);
  50
  51         drm_for_each_crtc(crtc, dev)
  52                 client->modesets[i++].crtc = crtc;
  53
  54         /* Cloning is only supported in the single crtc case. */
  55         if (num_crtc == 1)
  56                 max_connector_count = DRM_CLIENT_MAX_CLONED_CONNECTORS;
  57
  58         for (modeset = client->modesets; modeset->crtc; modeset++) {
  59                 modeset->connectors = kcalloc(max_connector_count,
  60                                               sizeof(*modeset->connectors), GFP_KERNEL);
  61                 if (!modeset->connectors)
  62                         goto err_free;
  63         }
  64
  65         return 0;
  66
  67 err_free:
  68         drm_client_modeset_free(client);
  69
  70         return -ENOMEM;
  71 }
  72
  73 static void drm_client_modeset_release(struct drm_client_dev *client)
  74 {
  75         struct drm_mode_set *modeset;
  76         unsigned int i;
  77
  78         drm_client_for_each_modeset(modeset, client) {
  79                 drm_mode_destroy(client->dev, modeset->mode);
  80                 modeset->mode = NULL;
  81                 modeset->fb = NULL;
  82
  83                 for (i = 0; i < modeset->num_connectors; i++) {
  84                         drm_connector_put(modeset->connectors[i]);
  85                         modeset->connectors[i] = NULL;
  86                 }
  87                 modeset->num_connectors = 0;
  88         }
  89 }
  90
  91 void drm_client_modeset_free(struct drm_client_dev *client)
  92 {
  93         struct drm_mode_set *modeset;
  94
  95         mutex_lock(&client->modeset_mutex);
  96
  97         drm_client_modeset_release(client);
  98
  99         drm_client_for_each_modeset(modeset, client)
 100                 kfree(modeset->connectors);
 101
 102         mutex_unlock(&client->modeset_mutex);
 103
 104         mutex_destroy(&client->modeset_mutex);
 105         kfree(client->modesets);
 106 }
 107
 108 static struct drm_mode_set *
 109 drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
 110 {
 111         struct drm_mode_set *modeset;
 112
 113         drm_client_for_each_modeset(modeset, client)
 114                 if (modeset->crtc == crtc)
 115                         return modeset;
 116
 117         return NULL;
 118 }
 119
 120 static struct drm_display_mode *
 121 drm_connector_get_tiled_mode(struct drm_connector *connector)
 122 {
 123         struct drm_display_mode *mode;
 124
 125         list_for_each_entry(mode, &connector->modes, head) {
 126                 if (mode->hdisplay == connector->tile_h_size &&
 127                     mode->vdisplay == connector->tile_v_size)
 128                         return mode;
 129         }
 130         return NULL;
 131 }
 132
 133 static struct drm_display_mode *
 134 drm_connector_fallback_non_tiled_mode(struct drm_connector *connector)
 135 {
 136         struct drm_display_mode *mode;
 137
 138         list_for_each_entry(mode, &connector->modes, head) {
 139                 if (mode->hdisplay == connector->tile_h_size &&
 140                     mode->vdisplay == connector->tile_v_size)
 141                         continue;
 142                 return mode;
 143         }
 144         return NULL;
 145 }
 146
 147 static struct drm_display_mode *
 148 drm_connector_preferred_mode(struct drm_connector *connector, int width, int height)
 149 {
 150         struct drm_display_mode *mode;
 151
 152         list_for_each_entry(mode, &connector->modes, head) {
 153                 if (mode->hdisplay > width ||
 154                     mode->vdisplay > height)
 155                         continue;
 156                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 157                         return mode;
 158         }
 159         return NULL;
 160 }
 161
 162 static struct drm_display_mode *drm_connector_first_mode(struct drm_connector *connector)
 163 {
 164         return list_first_entry_or_null(&connector->modes,
 165                                         struct drm_display_mode, head);
 166 }
 167
 168 static struct drm_display_mode *drm_connector_pick_cmdline_mode(struct drm_connector *connector)
 169 {
 170         struct drm_cmdline_mode *cmdline_mode;
 171         struct drm_display_mode *mode;
 172         bool prefer_non_interlace;
 173
 174         /*
 175          * Find a user-defined mode. If the user gave us a valid
 176          * mode on the kernel command line, it will show up in this
 177          * list.
 178          */
 179
 180         list_for_each_entry(mode, &connector->modes, head) {
 181                 if (mode->type & DRM_MODE_TYPE_USERDEF)
 182                         return mode;
 183         }
 184
 185         cmdline_mode = &connector->cmdline_mode;
 186         if (cmdline_mode->specified == false)
 187                 return NULL;
 188
 189         /*
 190          * Attempt to find a matching mode in the list of modes we
 191          * have gotten so far.
 192          */
 193
 194         prefer_non_interlace = !cmdline_mode->interlace;
 195 again:
 196         list_for_each_entry(mode, &connector->modes, head) {
 197                 /* check width/height */
 198                 if (mode->hdisplay != cmdline_mode->xres ||
 199                     mode->vdisplay != cmdline_mode->yres)
 200                         continue;
 201
 202                 if (cmdline_mode->refresh_specified) {
 203                         if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
 204                                 continue;
 205                 }
 206
 207                 if (cmdline_mode->interlace) {
 208                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
 209                                 continue;
 210                 } else if (prefer_non_interlace) {
 211                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 212                                 continue;
 213                 }
 214                 return mode;
 215         }
 216
 217         if (prefer_non_interlace) {
 218                 prefer_non_interlace = false;
 219                 goto again;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 226 {
 227         bool enable;
 228
 229         if (connector->display_info.non_desktop)
 230                 return false;
 231
 232         if (strict)
 233                 enable = connector->status == connector_status_connected;
 234         else
 235                 enable = connector->status != connector_status_disconnected;
 236
 237         return enable;
 238 }
 239
 240 static void drm_client_connectors_enabled(struct drm_connector **connectors,
 241                                           unsigned int connector_count,
 242                                           bool *enabled)
 243 {
 244         bool any_enabled = false;
 245         struct drm_connector *connector;
 246         int i = 0;
 247
 248         for (i = 0; i < connector_count; i++) {
 249                 connector = connectors[i];
 250                 enabled[i] = drm_connector_enabled(connector, true);
 251                 drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] enabled? %s\n",
 252                             connector->base.id, connector->name,
 253                             connector->display_info.non_desktop ?
 254                             "non desktop" : str_yes_no(enabled[i]));
 255
 256                 any_enabled |= enabled[i];
 257         }
 258
 259         if (any_enabled)
 260                 return;
 261
 262         for (i = 0; i < connector_count; i++)
 263                 enabled[i] = drm_connector_enabled(connectors[i], false);
 264 }
 265
 266 static bool drm_client_target_cloned(struct drm_device *dev,
 267                                      struct drm_connector **connectors,
 268                                      unsigned int connector_count,
 269                                      struct drm_display_mode **modes,
 270                                      struct drm_client_offset *offsets,
 271                                      bool *enabled, int width, int height)
 272 {
 273         int count, i, j;
 274         bool can_clone = false;
 275         struct drm_display_mode *dmt_mode, *mode;
 276
 277         /* only contemplate cloning in the single crtc case */
 278         if (dev->mode_config.num_crtc > 1)
 279                 return false;
 280
 281         count = 0;
 282         for (i = 0; i < connector_count; i++) {
 283                 if (enabled[i])
 284                         count++;
 285         }
 286
 287         /* only contemplate cloning if more than one connector is enabled */
 288         if (count <= 1)
 289                 return false;
 290
 291         /* check the command line or if nothing common pick 1024x768 */
 292         can_clone = true;
 293         for (i = 0; i < connector_count; i++) {
 294                 if (!enabled[i])
 295                         continue;
 296                 modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
 297                 if (!modes[i]) {
 298                         can_clone = false;
 299                         break;
 300                 }
 301                 for (j = 0; j < i; j++) {
 302                         if (!enabled[j])
 303                                 continue;
 304                         if (!drm_mode_match(modes[j], modes[i],
 305                                             DRM_MODE_MATCH_TIMINGS |
 306                                             DRM_MODE_MATCH_CLOCK |
 307                                             DRM_MODE_MATCH_FLAGS |
 308                                             DRM_MODE_MATCH_3D_FLAGS))
 309                                 can_clone = false;
 310                 }
 311         }
 312
 313         if (can_clone) {
 314                 drm_dbg_kms(dev, "can clone using command line\n");
 315                 return true;
 316         }
 317
 318         /* try and find a 1024x768 mode on each connector */
 319         can_clone = true;
 320         dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
 321
 322         if (!dmt_mode)
 323                 goto fail;
 324
 325         for (i = 0; i < connector_count; i++) {
 326                 if (!enabled[i])
 327                         continue;
 328
 329                 list_for_each_entry(mode, &connectors[i]->modes, head) {
 330                         if (drm_mode_match(mode, dmt_mode,
 331                                            DRM_MODE_MATCH_TIMINGS |
 332                                            DRM_MODE_MATCH_CLOCK |
 333                                            DRM_MODE_MATCH_FLAGS |
 334                                            DRM_MODE_MATCH_3D_FLAGS))
 335                                 modes[i] = mode;
 336                 }
 337                 if (!modes[i])
 338                         can_clone = false;
 339         }
 340         drm_mode_destroy(dev, dmt_mode);
 341
 342         if (can_clone) {
 343                 drm_dbg_kms(dev, "can clone using 1024x768\n");
 344                 return true;
 345         }
 346 fail:
 347         drm_info(dev, "kms: can't enable cloning when we probably wanted to.\n");
 348         return false;
 349 }
 350
 351 static int drm_client_get_tile_offsets(struct drm_device *dev,
 352                                        struct drm_connector **connectors,
 353                                        unsigned int connector_count,
 354                                        struct drm_display_mode **modes,
 355                                        struct drm_client_offset *offsets,
 356                                        int idx,
 357                                        int h_idx, int v_idx)
 358 {
 359         struct drm_connector *connector;
 360         int i;
 361         int hoffset = 0, voffset = 0;
 362
 363         for (i = 0; i < connector_count; i++) {
 364                 connector = connectors[i];
 365                 if (!connector->has_tile)
 366                         continue;
 367
 368                 if (!modes[i] && (h_idx || v_idx)) {
 369                         drm_dbg_kms(dev,
 370                                     "[CONNECTOR:%d:%s] no modes for connector tiled %d\n",
 371                                     connector->base.id, connector->name, i);
 372                         continue;
 373                 }
 374                 if (connector->tile_h_loc < h_idx)
 375                         hoffset += modes[i]->hdisplay;
 376
 377                 if (connector->tile_v_loc < v_idx)
 378                         voffset += modes[i]->vdisplay;
 379         }
 380         offsets[idx].x = hoffset;
 381         offsets[idx].y = voffset;
 382         drm_dbg_kms(dev, "returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
 383         return 0;
 384 }
 385
 386 static bool drm_client_target_preferred(struct drm_device *dev,
 387                                         struct drm_connector **connectors,
 388                                         unsigned int connector_count,
 389                                         struct drm_display_mode **modes,
 390                                         struct drm_client_offset *offsets,
 391                                         bool *enabled, int width, int height)
 392 {
 393         const u64 mask = BIT_ULL(connector_count) - 1;
 394         struct drm_connector *connector;
 395         u64 conn_configured = 0;
 396         int tile_pass = 0;
 397         int num_tiled_conns = 0;
 398         int i;
 399
 400         for (i = 0; i < connector_count; i++) {
 401                 if (connectors[i]->has_tile &&
 402                     connectors[i]->status == connector_status_connected)
 403                         num_tiled_conns++;
 404         }
 405
 406 retry:
 407         for (i = 0; i < connector_count; i++) {
 408                 connector = connectors[i];
 409
 410                 if (conn_configured & BIT_ULL(i))
 411                         continue;
 412
 413                 if (enabled[i] == false) {
 414                         conn_configured |= BIT_ULL(i);
 415                         continue;
 416                 }
 417
 418                 /* first pass over all the untiled connectors */
 419                 if (tile_pass == 0 && connector->has_tile)
 420                         continue;
 421
 422                 if (tile_pass == 1) {
 423                         if (connector->tile_h_loc != 0 ||
 424                             connector->tile_v_loc != 0)
 425                                 continue;
 426
 427                 } else {
 428                         if (connector->tile_h_loc != tile_pass - 1 &&
 429                             connector->tile_v_loc != tile_pass - 1)
 430                         /* if this tile_pass doesn't cover any of the tiles - keep going */
 431                                 continue;
 432
 433                         /*
 434                          * find the tile offsets for this pass - need to find
 435                          * all tiles left and above
 436                          */
 437                         drm_client_get_tile_offsets(dev, connectors, connector_count,
 438                                                     modes, offsets, i,
 439                                                     connector->tile_h_loc, connector->tile_v_loc);
 440                 }
 441                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for cmdline mode\n",
 442                             connector->base.id, connector->name);
 443
 444                 /* got for command line mode first */
 445                 modes[i] = drm_connector_pick_cmdline_mode(connector);
 446                 if (!modes[i]) {
 447                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for preferred mode, tile %d\n",
 448                                     connector->base.id, connector->name,
 449                                     connector->tile_group ? connector->tile_group->id : 0);
 450                         modes[i] = drm_connector_preferred_mode(connector, width, height);
 451                 }
 452                 /* No preferred modes, pick one off the list */
 453                 if (!modes[i])
 454                         modes[i] = drm_connector_first_mode(connector);
 455                 /*
 456                  * In case of tiled mode if all tiles not present fallback to
 457                  * first available non tiled mode.
 458                  * After all tiles are present, try to find the tiled mode
 459                  * for all and if tiled mode not present due to fbcon size
 460                  * limitations, use first non tiled mode only for
 461                  * tile 0,0 and set to no mode for all other tiles.
 462                  */
 463                 if (connector->has_tile) {
 464                         if (num_tiled_conns <
 465                             connector->num_h_tile * connector->num_v_tile ||
 466                             (connector->tile_h_loc == 0 &&
 467                              connector->tile_v_loc == 0 &&
 468                              !drm_connector_get_tiled_mode(connector))) {
 469                                 drm_dbg_kms(dev,
 470                                             "[CONNECTOR:%d:%s] Falling back to non-tiled mode\n",
 471                                             connector->base.id, connector->name);
 472                                 modes[i] = drm_connector_fallback_non_tiled_mode(connector);
 473                         } else {
 474                                 modes[i] = drm_connector_get_tiled_mode(connector);
 475                         }
 476                 }
 477
 478                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Found mode %s\n",
 479                             connector->base.id, connector->name,
 480                             modes[i] ? modes[i]->name : "none");
 481                 conn_configured |= BIT_ULL(i);
 482         }
 483
 484         if ((conn_configured & mask) != mask) {
 485                 tile_pass++;
 486                 goto retry;
 487         }
 488         return true;
 489 }
 490
 491 static bool connector_has_possible_crtc(struct drm_connector *connector,
 492                                         struct drm_crtc *crtc)
 493 {
 494         struct drm_encoder *encoder;
 495
 496         drm_connector_for_each_possible_encoder(connector, encoder) {
 497                 if (encoder->possible_crtcs & drm_crtc_mask(crtc))
 498                         return true;
 499         }
 500
 501         return false;
 502 }
 503
 504 static int drm_client_pick_crtcs(struct drm_client_dev *client,
 505                                  struct drm_connector **connectors,
 506                                  unsigned int connector_count,
 507                                  struct drm_crtc **best_crtcs,
 508                                  struct drm_display_mode **modes,
 509                                  int n, int width, int height)
 510 {
 511         struct drm_device *dev = client->dev;
 512         struct drm_connector *connector;
 513         int my_score, best_score, score;
 514         struct drm_crtc **crtcs, *crtc;
 515         struct drm_mode_set *modeset;
 516         int o;
 517
 518         if (n == connector_count)
 519                 return 0;
 520
 521         connector = connectors[n];
 522
 523         best_crtcs[n] = NULL;
 524         best_score = drm_client_pick_crtcs(client, connectors, connector_count,
 525                                            best_crtcs, modes, n + 1, width, height);
 526         if (modes[n] == NULL)
 527                 return best_score;
 528
 529         crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
 530         if (!crtcs)
 531                 return best_score;
 532
 533         my_score = 1;
 534         if (connector->status == connector_status_connected)
 535                 my_score++;
 536         if (connector->cmdline_mode.specified)
 537                 my_score++;
 538         if (drm_connector_preferred_mode(connector, width, height))
 539                 my_score++;
 540
 541         /*
 542          * select a crtc for this connector and then attempt to configure
 543          * remaining connectors
 544          */
 545         drm_client_for_each_modeset(modeset, client) {
 546                 crtc = modeset->crtc;
 547
 548                 if (!connector_has_possible_crtc(connector, crtc))
 549                         continue;
 550
 551                 for (o = 0; o < n; o++)
 552                         if (best_crtcs[o] == crtc)
 553                                 break;
 554
 555                 if (o < n) {
 556                         /* ignore cloning unless only a single crtc */
 557                         if (dev->mode_config.num_crtc > 1)
 558                                 continue;
 559
 560                         if (!drm_mode_equal(modes[o], modes[n]))
 561                                 continue;
 562                 }
 563
 564                 crtcs[n] = crtc;
 565                 memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
 566                 score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
 567                                                          crtcs, modes, n + 1, width, height);
 568                 if (score > best_score) {
 569                         best_score = score;
 570                         memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
 571                 }
 572         }
 573
 574         kfree(crtcs);
 575         return best_score;
 576 }
 577
 578 /* Try to read the BIOS display configuration and use it for the initial config */
 579 static bool drm_client_firmware_config(struct drm_client_dev *client,
 580                                        struct drm_connector **connectors,
 581                                        unsigned int connector_count,
 582                                        struct drm_crtc **crtcs,
 583                                        struct drm_display_mode **modes,
 584                                        struct drm_client_offset *offsets,
 585                                        bool *enabled, int width, int height)
 586 {
 587         const int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
 588         unsigned long conn_configured, conn_seq, mask;
 589         struct drm_device *dev = client->dev;
 590         int i, j;
 591         bool *save_enabled;
 592         bool fallback = true, ret = true;
 593         int num_connectors_enabled = 0;
 594         int num_connectors_detected = 0;
 595         int num_tiled_conns = 0;
 596         struct drm_modeset_acquire_ctx ctx;
 597
 598         if (!drm_drv_uses_atomic_modeset(dev))
 599                 return false;
 600
 601         if (drm_WARN_ON(dev, count <= 0))
 602                 return false;
 603
 604         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 605         if (!save_enabled)
 606                 return false;
 607
 608         drm_modeset_acquire_init(&ctx, 0);
 609
 610         while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
 611                 drm_modeset_backoff(&ctx);
 612
 613         memcpy(save_enabled, enabled, count);
 614         mask = GENMASK(count - 1, 0);
 615         conn_configured = 0;
 616         for (i = 0; i < count; i++) {
 617                 if (connectors[i]->has_tile &&
 618                     connectors[i]->status == connector_status_connected)
 619                         num_tiled_conns++;
 620         }
 621 retry:
 622         conn_seq = conn_configured;
 623         for (i = 0; i < count; i++) {
 624                 struct drm_connector *connector;
 625                 struct drm_encoder *encoder;
 626                 struct drm_crtc *new_crtc;
 627
 628                 connector = connectors[i];
 629
 630                 if (conn_configured & BIT(i))
 631                         continue;
 632
 633                 if (conn_seq == 0 && !connector->has_tile)
 634                         continue;
 635
 636                 if (connector->status == connector_status_connected)
 637                         num_connectors_detected++;
 638
 639                 if (!enabled[i]) {
 640                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] not enabled, skipping\n",
 641                                     connector->base.id, connector->name);
 642                         conn_configured |= BIT(i);
 643                         continue;
 644                 }
 645
 646                 if (connector->force == DRM_FORCE_OFF) {
 647                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] disabled by user, skipping\n",
 648                                     connector->base.id, connector->name);
 649                         enabled[i] = false;
 650                         continue;
 651                 }
 652
 653                 encoder = connector->state->best_encoder;
 654                 if (!encoder || drm_WARN_ON(dev, !connector->state->crtc)) {
 655                         if (connector->force > DRM_FORCE_OFF)
 656                                 goto bail;
 657
 658                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] has no encoder or crtc, skipping\n",
 659                                     connector->base.id, connector->name);
 660                         enabled[i] = false;
 661                         conn_configured |= BIT(i);
 662                         continue;
 663                 }
 664
 665                 num_connectors_enabled++;
 666
 667                 new_crtc = connector->state->crtc;
 668
 669                 /*
 670                  * Make sure we're not trying to drive multiple connectors
 671                  * with a single CRTC, since our cloning support may not
 672                  * match the BIOS.
 673                  */
 674                 for (j = 0; j < count; j++) {
 675                         if (crtcs[j] == new_crtc) {
 676                                 drm_dbg_kms(dev, "fallback: cloned configuration\n");
 677                                 goto bail;
 678                         }
 679                 }
 680
 681                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for cmdline mode\n",
 682                             connector->base.id, connector->name);
 683
 684                 /* go for command line mode first */
 685                 modes[i] = drm_connector_pick_cmdline_mode(connector);
 686
 687                 /* try for preferred next */
 688                 if (!modes[i]) {
 689                         drm_dbg_kms(dev,
 690                                     "[CONNECTOR:%d:%s] looking for preferred mode, has tile: %s\n",
 691                                     connector->base.id, connector->name,
 692                                     str_yes_no(connector->has_tile));
 693                         modes[i] = drm_connector_preferred_mode(connector, width, height);
 694                 }
 695
 696                 /* No preferred mode marked by the EDID? Are there any modes? */
 697                 if (!modes[i] && !list_empty(&connector->modes)) {
 698                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] using first listed mode\n",
 699                                     connector->base.id, connector->name);
 700                         modes[i] = drm_connector_first_mode(connector);
 701                 }
 702
 703                 /* last resort: use current mode */
 704                 if (!modes[i]) {
 705                         /*
 706                          * IMPORTANT: We want to use the adjusted mode (i.e.
 707                          * after the panel fitter upscaling) as the initial
 708                          * config, not the input mode, which is what crtc->mode
 709                          * usually contains. But since our current
 710                          * code puts a mode derived from the post-pfit timings
 711                          * into crtc->mode this works out correctly.
 712                          *
 713                          * This is crtc->mode and not crtc->state->mode for the
 714                          * fastboot check to work correctly.
 715                          */
 716                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] looking for current mode\n",
 717                                     connector->base.id, connector->name);
 718                         modes[i] = &connector->state->crtc->mode;
 719                 }
 720                 /*
 721                  * In case of tiled modes, if all tiles are not present
 722                  * then fallback to a non tiled mode.
 723                  */
 724                 if (connector->has_tile &&
 725                     num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
 726                         drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Falling back to non-tiled mode\n",
 727                                     connector->base.id, connector->name);
 728                         modes[i] = drm_connector_fallback_non_tiled_mode(connector);
 729                 }
 730                 crtcs[i] = new_crtc;
 731
 732                 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] on [CRTC:%d:%s]: %dx%d%s\n",
 733                             connector->base.id, connector->name,
 734                             connector->state->crtc->base.id,
 735                             connector->state->crtc->name,
 736                             modes[i]->hdisplay, modes[i]->vdisplay,
 737                             modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
 738
 739                 fallback = false;
 740                 conn_configured |= BIT(i);
 741         }
 742
 743         if ((conn_configured & mask) != mask && conn_configured != conn_seq)
 744                 goto retry;
 745
 746         /*
 747          * If the BIOS didn't enable everything it could, fall back to have the
 748          * same user experiencing of lighting up as much as possible like the
 749          * fbdev helper library.
 750          */
 751         if (num_connectors_enabled != num_connectors_detected &&
 752             num_connectors_enabled < dev->mode_config.num_crtc) {
 753                 drm_dbg_kms(dev, "fallback: Not all outputs enabled\n");
 754                 drm_dbg_kms(dev, "Enabled: %i, detected: %i\n",
 755                             num_connectors_enabled, num_connectors_detected);
 756                 fallback = true;
 757         }
 758
 759         if (fallback) {
 760 bail:
 761                 drm_dbg_kms(dev, "Not using firmware configuration\n");
 762                 memcpy(enabled, save_enabled, count);
 763                 ret = false;
 764         }
 765
 766         drm_modeset_drop_locks(&ctx);
 767         drm_modeset_acquire_fini(&ctx);
 768
 769         kfree(save_enabled);
 770         return ret;
 771 }
 772
 773 /**
 774  * drm_client_modeset_probe() - Probe for displays
 775  * @client: DRM client
 776  * @width: Maximum display mode width (optional)
 777  * @height: Maximum display mode height (optional)
 778  *
 779  * This function sets up display pipelines for enabled connectors and stores the
 780  * config in the client's modeset array.
 781  *
 782  * Returns:
 783  * Zero on success or negative error code on failure.
 784  */
 785 int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
 786 {
 787         struct drm_connector *connector, **connectors = NULL;
 788         struct drm_connector_list_iter conn_iter;
 789         struct drm_device *dev = client->dev;
 790         unsigned int total_modes_count = 0;
 791         struct drm_client_offset *offsets;
 792         unsigned int connector_count = 0;
 793         /* points to modes protected by mode_config.mutex */
 794         struct drm_display_mode **modes;
 795         struct drm_crtc **crtcs;
 796         int i, ret = 0;
 797         bool *enabled;
 798
 799         drm_dbg_kms(dev, "\n");
 800
 801         if (!width)
 802                 width = dev->mode_config.max_width;
 803         if (!height)
 804                 height = dev->mode_config.max_height;
 805
 806         drm_connector_list_iter_begin(dev, &conn_iter);
 807         drm_client_for_each_connector_iter(connector, &conn_iter) {
 808                 struct drm_connector **tmp;
 809
 810                 tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
 811                 if (!tmp) {
 812                         ret = -ENOMEM;
 813                         goto free_connectors;
 814                 }
 815
 816                 connectors = tmp;
 817                 drm_connector_get(connector);
 818                 connectors[connector_count++] = connector;
 819         }
 820         drm_connector_list_iter_end(&conn_iter);
 821
 822         if (!connector_count)
 823                 return 0;
 824
 825         crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
 826         modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
 827         offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
 828         enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
 829         if (!crtcs || !modes || !enabled || !offsets) {
 830                 ret = -ENOMEM;
 831                 goto out;
 832         }
 833
 834         mutex_lock(&client->modeset_mutex);
 835
 836         mutex_lock(&dev->mode_config.mutex);
 837         for (i = 0; i < connector_count; i++)
 838                 total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
 839         if (!total_modes_count)
 840                 drm_dbg_kms(dev, "No connectors reported connected with modes\n");
 841         drm_client_connectors_enabled(connectors, connector_count, enabled);
 842
 843         if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
 844                                         modes, offsets, enabled, width, height)) {
 845                 memset(modes, 0, connector_count * sizeof(*modes));
 846                 memset(crtcs, 0, connector_count * sizeof(*crtcs));
 847                 memset(offsets, 0, connector_count * sizeof(*offsets));
 848
 849                 if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
 850                                               offsets, enabled, width, height) &&
 851                     !drm_client_target_preferred(dev, connectors, connector_count, modes,
 852                                                  offsets, enabled, width, height))
 853                         drm_err(dev, "Unable to find initial modes\n");
 854
 855                 drm_dbg_kms(dev, "picking CRTCs for %dx%d config\n",
 856                             width, height);
 857
 858                 drm_client_pick_crtcs(client, connectors, connector_count,
 859                                       crtcs, modes, 0, width, height);
 860         }
 861
 862         drm_client_modeset_release(client);
 863
 864         for (i = 0; i < connector_count; i++) {
 865                 struct drm_display_mode *mode = modes[i];
 866                 struct drm_crtc *crtc = crtcs[i];
 867                 struct drm_client_offset *offset = &offsets[i];
 868
 869                 if (mode && crtc) {
 870                         struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
 871                         struct drm_connector *connector = connectors[i];
 872
 873                         drm_dbg_kms(dev, "[CRTC:%d:%s] desired mode %s set (%d,%d)\n",
 874                                     crtc->base.id, crtc->name,
 875                                     mode->name, offset->x, offset->y);
 876
 877                         if (drm_WARN_ON_ONCE(dev, modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
 878                                              (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
 879                                 ret = -EINVAL;
 880                                 break;
 881                         }
 882
 883                         drm_mode_destroy(dev, modeset->mode);
 884                         modeset->mode = drm_mode_duplicate(dev, mode);
 885                         if (!modeset->mode) {
 886                                 ret = -ENOMEM;
 887                                 break;
 888                         }
 889
 890                         drm_connector_get(connector);
 891                         modeset->connectors[modeset->num_connectors++] = connector;
 892                         modeset->x = offset->x;
 893                         modeset->y = offset->y;
 894                 }
 895         }
 896         mutex_unlock(&dev->mode_config.mutex);
 897
 898         mutex_unlock(&client->modeset_mutex);
 899 out:
 900         kfree(crtcs);
 901         kfree(modes);
 902         kfree(offsets);
 903         kfree(enabled);
 904 free_connectors:
 905         for (i = 0; i < connector_count; i++)
 906                 drm_connector_put(connectors[i]);
 907         kfree(connectors);
 908
 909         return ret;
 910 }
 911 EXPORT_SYMBOL(drm_client_modeset_probe);
 912
 913 /**
 914  * drm_client_rotation() - Check the initial rotation value
 915  * @modeset: DRM modeset
 916  * @rotation: Returned rotation value
 917  *
 918  * This function checks if the primary plane in @modeset can hw rotate
 919  * to match the rotation needed on its connector.
 920  *
 921  * Note: Currently only 0 and 180 degrees are supported.
 922  *
 923  * Return:
 924  * True if the plane can do the rotation, false otherwise.
 925  */
 926 bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
 927 {
 928         struct drm_connector *connector = modeset->connectors[0];
 929         struct drm_plane *plane = modeset->crtc->primary;
 930         struct drm_cmdline_mode *cmdline;
 931         u64 valid_mask = 0;
 932         unsigned int i;
 933
 934         if (!modeset->num_connectors)
 935                 return false;
 936
 937         switch (connector->display_info.panel_orientation) {
 938         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 939                 *rotation = DRM_MODE_ROTATE_180;
 940                 break;
 941         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 942                 *rotation = DRM_MODE_ROTATE_90;
 943                 break;
 944         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 945                 *rotation = DRM_MODE_ROTATE_270;
 946                 break;
 947         default:
 948                 *rotation = DRM_MODE_ROTATE_0;
 949         }
 950
 951         /**
 952          * The panel already defined the default rotation
 953          * through its orientation. Whatever has been provided
 954          * on the command line needs to be added to that.
 955          *
 956          * Unfortunately, the rotations are at different bit
 957          * indices, so the math to add them up are not as
 958          * trivial as they could.
 959          *
 960          * Reflections on the other hand are pretty trivial to deal with, a
 961          * simple XOR between the two handle the addition nicely.
 962          */
 963         cmdline = &connector->cmdline_mode;
 964         if (cmdline->specified && cmdline->rotation_reflection) {
 965                 unsigned int cmdline_rest, panel_rest;
 966                 unsigned int cmdline_rot, panel_rot;
 967                 unsigned int sum_rot, sum_rest;
 968
 969                 panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
 970                 cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
 971                 sum_rot = (panel_rot + cmdline_rot) % 4;
 972
 973                 panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
 974                 cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
 975                 sum_rest = panel_rest ^ cmdline_rest;
 976
 977                 *rotation = (1 << sum_rot) | sum_rest;
 978         }
 979
 980         /*
 981          * TODO: support 90 / 270 degree hardware rotation,
 982          * depending on the hardware this may require the framebuffer
 983          * to be in a specific tiling format.
 984          */
 985         if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
 986              (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
 987             !plane->rotation_property)
 988                 return false;
 989
 990         for (i = 0; i < plane->rotation_property->num_values; i++)
 991                 valid_mask |= (1ULL << plane->rotation_property->values[i]);
 992
 993         if (!(*rotation & valid_mask))
 994                 return false;
 995
 996         return true;
 997 }
 998 EXPORT_SYMBOL(drm_client_rotation);
 999
1000 static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active, bool check)
1001 {
1002         struct drm_device *dev = client->dev;
1003         struct drm_plane *plane;
1004         struct drm_atomic_state *state;
1005         struct drm_modeset_acquire_ctx ctx;
1006         struct drm_mode_set *mode_set;
1007         int ret;
1008
1009         drm_modeset_acquire_init(&ctx, 0);
1010
1011         state = drm_atomic_state_alloc(dev);
1012         if (!state) {
1013                 ret = -ENOMEM;
1014                 goto out_ctx;
1015         }
1016
1017         state->acquire_ctx = &ctx;
1018 retry:
1019         drm_for_each_plane(plane, dev) {
1020                 struct drm_plane_state *plane_state;
1021
1022                 plane_state = drm_atomic_get_plane_state(state, plane);
1023                 if (IS_ERR(plane_state)) {
1024                         ret = PTR_ERR(plane_state);
1025                         goto out_state;
1026                 }
1027
1028                 plane_state->rotation = DRM_MODE_ROTATE_0;
1029
1030                 /* disable non-primary: */
1031                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
1032                         continue;
1033
1034                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
1035                 if (ret != 0)
1036                         goto out_state;
1037         }
1038
1039         drm_client_for_each_modeset(mode_set, client) {
1040                 struct drm_plane *primary = mode_set->crtc->primary;
1041                 unsigned int rotation;
1042
1043                 if (drm_client_rotation(mode_set, &rotation)) {
1044                         struct drm_plane_state *plane_state;
1045
1046                         /* Cannot fail as we've already gotten the plane state above */
1047                         plane_state = drm_atomic_get_new_plane_state(state, primary);
1048                         plane_state->rotation = rotation;
1049                 }
1050
1051                 ret = __drm_atomic_helper_set_config(mode_set, state);
1052                 if (ret != 0)
1053                         goto out_state;
1054
1055                 /*
1056                  * __drm_atomic_helper_set_config() sets active when a
1057                  * mode is set, unconditionally clear it if we force DPMS off
1058                  */
1059                 if (!active) {
1060                         struct drm_crtc *crtc = mode_set->crtc;
1061                         struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1062
1063                         crtc_state->active = false;
1064                 }
1065         }
1066
1067         if (check)
1068                 ret = drm_atomic_check_only(state);
1069         else
1070                 ret = drm_atomic_commit(state);
1071
1072 out_state:
1073         if (ret == -EDEADLK)
1074                 goto backoff;
1075
1076         drm_atomic_state_put(state);
1077 out_ctx:
1078         drm_modeset_drop_locks(&ctx);
1079         drm_modeset_acquire_fini(&ctx);
1080
1081         return ret;
1082
1083 backoff:
1084         drm_atomic_state_clear(state);
1085         drm_modeset_backoff(&ctx);
1086
1087         goto retry;
1088 }
1089
1090 static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
1091 {
1092         struct drm_device *dev = client->dev;
1093         struct drm_mode_set *mode_set;
1094         struct drm_plane *plane;
1095         int ret = 0;
1096
1097         drm_modeset_lock_all(dev);
1098         drm_for_each_plane(plane, dev) {
1099                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
1100                         drm_plane_force_disable(plane);
1101
1102                 if (plane->rotation_property)
1103                         drm_mode_plane_set_obj_prop(plane,
1104                                                     plane->rotation_property,
1105                                                     DRM_MODE_ROTATE_0);
1106         }
1107
1108         drm_client_for_each_modeset(mode_set, client) {
1109                 struct drm_crtc *crtc = mode_set->crtc;
1110
1111                 if (crtc->funcs->cursor_set2) {
1112                         ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1113                         if (ret)
1114                                 goto out;
1115                 } else if (crtc->funcs->cursor_set) {
1116                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1117                         if (ret)
1118                                 goto out;
1119                 }
1120
1121                 ret = drm_mode_set_config_internal(mode_set);
1122                 if (ret)
1123                         goto out;
1124         }
1125 out:
1126         drm_modeset_unlock_all(dev);
1127
1128         return ret;
1129 }
1130
1131 /**
1132  * drm_client_modeset_check() - Check modeset configuration
1133  * @client: DRM client
1134  *
1135  * Check modeset configuration.
1136  *
1137  * Returns:
1138  * Zero on success or negative error code on failure.
1139  */
1140 int drm_client_modeset_check(struct drm_client_dev *client)
1141 {
1142         int ret;
1143
1144         if (!drm_drv_uses_atomic_modeset(client->dev))
1145                 return 0;
1146
1147         mutex_lock(&client->modeset_mutex);
1148         ret = drm_client_modeset_commit_atomic(client, true, true);
1149         mutex_unlock(&client->modeset_mutex);
1150
1151         return ret;
1152 }
1153 EXPORT_SYMBOL(drm_client_modeset_check);
1154
1155 /**
1156  * drm_client_modeset_commit_locked() - Force commit CRTC configuration
1157  * @client: DRM client
1158  *
1159  * Commit modeset configuration to crtcs without checking if there is a DRM
1160  * master. The assumption is that the caller already holds an internal DRM
1161  * master reference acquired with drm_master_internal_acquire().
1162  *
1163  * Returns:
1164  * Zero on success or negative error code on failure.
1165  */
1166 int drm_client_modeset_commit_locked(struct drm_client_dev *client)
1167 {
1168         struct drm_device *dev = client->dev;
1169         int ret;
1170
1171         mutex_lock(&client->modeset_mutex);
1172         if (drm_drv_uses_atomic_modeset(dev))
1173                 ret = drm_client_modeset_commit_atomic(client, true, false);
1174         else
1175                 ret = drm_client_modeset_commit_legacy(client);
1176         mutex_unlock(&client->modeset_mutex);
1177
1178         return ret;
1179 }
1180 EXPORT_SYMBOL(drm_client_modeset_commit_locked);
1181
1182 /**
1183  * drm_client_modeset_commit() - Commit CRTC configuration
1184  * @client: DRM client
1185  *
1186  * Commit modeset configuration to crtcs.
1187  *
1188  * Returns:
1189  * Zero on success or negative error code on failure.
1190  */
1191 int drm_client_modeset_commit(struct drm_client_dev *client)
1192 {
1193         struct drm_device *dev = client->dev;
1194         int ret;
1195
1196         if (!drm_master_internal_acquire(dev))
1197                 return -EBUSY;
1198
1199         ret = drm_client_modeset_commit_locked(client);
1200
1201         drm_master_internal_release(dev);
1202
1203         return ret;
1204 }
1205 EXPORT_SYMBOL(drm_client_modeset_commit);
1206
1207 static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1208 {
1209         struct drm_device *dev = client->dev;
1210         struct drm_connector *connector;
1211         struct drm_mode_set *modeset;
1212         struct drm_modeset_acquire_ctx ctx;
1213         int j;
1214         int ret;
1215
1216         DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
1217         drm_client_for_each_modeset(modeset, client) {
1218                 if (!modeset->crtc->enabled)
1219                         continue;
1220
1221                 for (j = 0; j < modeset->num_connectors; j++) {
1222                         connector = modeset->connectors[j];
1223                         connector->funcs->dpms(connector, dpms_mode);
1224                         drm_object_property_set_value(&connector->base,
1225                                 dev->mode_config.dpms_property, dpms_mode);
1226                 }
1227         }
1228         DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
1229 }
1230
1231 /**
1232  * drm_client_modeset_dpms() - Set DPMS mode
1233  * @client: DRM client
1234  * @mode: DPMS mode
1235  *
1236  * Note: For atomic drivers @mode is reduced to on/off.
1237  *
1238  * Returns:
1239  * Zero on success or negative error code on failure.
1240  */
1241 int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1242 {
1243         struct drm_device *dev = client->dev;
1244         int ret = 0;
1245
1246         if (!drm_master_internal_acquire(dev))
1247                 return -EBUSY;
1248
1249         mutex_lock(&client->modeset_mutex);
1250         if (drm_drv_uses_atomic_modeset(dev))
1251                 ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON, false);
1252         else
1253                 drm_client_modeset_dpms_legacy(client, mode);
1254         mutex_unlock(&client->modeset_mutex);
1255
1256         drm_master_internal_release(dev);
1257
1258         return ret;
1259 }
1260 EXPORT_SYMBOL(drm_client_modeset_dpms);
1261
1262 #ifdef CONFIG_DRM_KUNIT_TEST
1263 #include "tests/drm_client_modeset_test.c"
1264 #endif