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