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