1 /* 2 * Copyright (c) 2006-2008 Intel Corporation 3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> 4 * 5 * DRM core CRTC related functions 6 * 7 * Permission to use, copy, modify, distribute, and sell this software and its 8 * documentation for any purpose is hereby granted without fee, provided that 9 * the above copyright notice appear in all copies and that both that copyright 10 * notice and this permission notice appear in supporting documentation, and 11 * that the name of the copyright holders not be used in advertising or 12 * publicity pertaining to distribution of the software without specific, 13 * written prior permission. The copyright holders make no representations 14 * about the suitability of this software for any purpose. It is provided "as 15 * is" without express or implied warranty. 16 * 17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 23 * OF THIS SOFTWARE. 24 * 25 * Authors: 26 * Keith Packard 27 * Eric Anholt <eric@anholt.net> 28 * Dave Airlie <airlied@linux.ie> 29 * Jesse Barnes <jesse.barnes@intel.com> 30 */ 31 32 #include <linux/kernel.h> 33 #include <linux/export.h> 34 #include <linux/moduleparam.h> 35 36 #include <drm/drmP.h> 37 #include <drm/drm_atomic.h> 38 #include <drm/drm_crtc.h> 39 #include <drm/drm_fourcc.h> 40 #include <drm/drm_crtc_helper.h> 41 #include <drm/drm_fb_helper.h> 42 #include <drm/drm_plane_helper.h> 43 #include <drm/drm_atomic_helper.h> 44 #include <drm/drm_edid.h> 45 46 /** 47 * DOC: overview 48 * 49 * The CRTC modeset helper library provides a default set_config implementation 50 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 51 * the same callbacks which drivers can use to e.g. restore the modeset 52 * configuration on resume with drm_helper_resume_force_mode(). 53 * 54 * Note that this helper library doesn't track the current power state of CRTCs 55 * and encoders. It can call callbacks like ->dpms() even though the hardware is 56 * already in the desired state. This deficiency has been fixed in the atomic 57 * helpers. 58 * 59 * The driver callbacks are mostly compatible with the atomic modeset helpers, 60 * except for the handling of the primary plane: Atomic helpers require that the 61 * primary plane is implemented as a real standalone plane and not directly tied 62 * to the CRTC state. For easier transition this library provides functions to 63 * implement the old semantics required by the CRTC helpers using the new plane 64 * and atomic helper callbacks. 65 * 66 * Drivers are strongly urged to convert to the atomic helpers (by way of first 67 * converting to the plane helpers). New drivers must not use these functions 68 * but need to implement the atomic interface instead, potentially using the 69 * atomic helpers for that. 70 * 71 * These legacy modeset helpers use the same function table structures as 72 * all other modesetting helpers. See the documentation for struct 73 * &drm_crtc_helper_funcs, struct &drm_encoder_helper_funcs and struct 74 * &drm_connector_helper_funcs. 75 */ 76 77 /** 78 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the 79 * connector list 80 * @dev: drm device to operate on 81 * 82 * Some userspace presumes that the first connected connector is the main 83 * display, where it's supposed to display e.g. the login screen. For 84 * laptops, this should be the main panel. Use this function to sort all 85 * (eDP/LVDS) panels to the front of the connector list, instead of 86 * painstakingly trying to initialize them in the right order. 87 */ 88 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) 89 { 90 struct drm_connector *connector, *tmp; 91 struct list_head panel_list; 92 93 INIT_LIST_HEAD(&panel_list); 94 95 list_for_each_entry_safe(connector, tmp, 96 &dev->mode_config.connector_list, head) { 97 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS || 98 connector->connector_type == DRM_MODE_CONNECTOR_eDP) 99 list_move_tail(&connector->head, &panel_list); 100 } 101 102 list_splice(&panel_list, &dev->mode_config.connector_list); 103 } 104 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 105 106 /** 107 * drm_helper_encoder_in_use - check if a given encoder is in use 108 * @encoder: encoder to check 109 * 110 * Checks whether @encoder is with the current mode setting output configuration 111 * in use by any connector. This doesn't mean that it is actually enabled since 112 * the DPMS state is tracked separately. 113 * 114 * Returns: 115 * True if @encoder is used, false otherwise. 116 */ 117 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 118 { 119 struct drm_connector *connector; 120 struct drm_device *dev = encoder->dev; 121 122 /* 123 * We can expect this mutex to be locked if we are not panicking. 124 * Locking is currently fubar in the panic handler. 125 */ 126 if (!oops_in_progress) { 127 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 128 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 129 } 130 131 drm_for_each_connector(connector, dev) 132 if (connector->encoder == encoder) 133 return true; 134 return false; 135 } 136 EXPORT_SYMBOL(drm_helper_encoder_in_use); 137 138 /** 139 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 140 * @crtc: CRTC to check 141 * 142 * Checks whether @crtc is with the current mode setting output configuration 143 * in use by any connector. This doesn't mean that it is actually enabled since 144 * the DPMS state is tracked separately. 145 * 146 * Returns: 147 * True if @crtc is used, false otherwise. 148 */ 149 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 150 { 151 struct drm_encoder *encoder; 152 struct drm_device *dev = crtc->dev; 153 154 /* 155 * We can expect this mutex to be locked if we are not panicking. 156 * Locking is currently fubar in the panic handler. 157 */ 158 if (!oops_in_progress) 159 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 160 161 drm_for_each_encoder(encoder, dev) 162 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 163 return true; 164 return false; 165 } 166 EXPORT_SYMBOL(drm_helper_crtc_in_use); 167 168 static void 169 drm_encoder_disable(struct drm_encoder *encoder) 170 { 171 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 172 173 if (!encoder_funcs) 174 return; 175 176 drm_bridge_disable(encoder->bridge); 177 178 if (encoder_funcs->disable) 179 (*encoder_funcs->disable)(encoder); 180 else if (encoder_funcs->dpms) 181 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 182 183 drm_bridge_post_disable(encoder->bridge); 184 } 185 186 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 187 { 188 struct drm_encoder *encoder; 189 struct drm_crtc *crtc; 190 191 drm_warn_on_modeset_not_all_locked(dev); 192 193 drm_for_each_encoder(encoder, dev) { 194 if (!drm_helper_encoder_in_use(encoder)) { 195 drm_encoder_disable(encoder); 196 /* disconnect encoder from any connector */ 197 encoder->crtc = NULL; 198 } 199 } 200 201 drm_for_each_crtc(crtc, dev) { 202 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 203 crtc->enabled = drm_helper_crtc_in_use(crtc); 204 if (!crtc->enabled) { 205 if (crtc_funcs->disable) 206 (*crtc_funcs->disable)(crtc); 207 else 208 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 209 crtc->primary->fb = NULL; 210 } 211 } 212 } 213 214 /** 215 * drm_helper_disable_unused_functions - disable unused objects 216 * @dev: DRM device 217 * 218 * This function walks through the entire mode setting configuration of @dev. It 219 * will remove any CRTC links of unused encoders and encoder links of 220 * disconnected connectors. Then it will disable all unused encoders and CRTCs 221 * either by calling their disable callback if available or by calling their 222 * dpms callback with DRM_MODE_DPMS_OFF. 223 * 224 * NOTE: 225 * 226 * This function is part of the legacy modeset helper library and will cause 227 * major confusion with atomic drivers. This is because atomic helpers guarantee 228 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 229 * on an enabled functions. drm_helper_disable_unused_functions() on the other 230 * hand throws such guarantees into the wind and calls disable hooks 231 * unconditionally on unused functions. 232 */ 233 void drm_helper_disable_unused_functions(struct drm_device *dev) 234 { 235 drm_modeset_lock_all(dev); 236 __drm_helper_disable_unused_functions(dev); 237 drm_modeset_unlock_all(dev); 238 } 239 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 240 241 /* 242 * Check the CRTC we're going to map each output to vs. its current 243 * CRTC. If they don't match, we have to disable the output and the CRTC 244 * since the driver will have to re-route things. 245 */ 246 static void 247 drm_crtc_prepare_encoders(struct drm_device *dev) 248 { 249 const struct drm_encoder_helper_funcs *encoder_funcs; 250 struct drm_encoder *encoder; 251 252 drm_for_each_encoder(encoder, dev) { 253 encoder_funcs = encoder->helper_private; 254 if (!encoder_funcs) 255 continue; 256 257 /* Disable unused encoders */ 258 if (encoder->crtc == NULL) 259 drm_encoder_disable(encoder); 260 /* Disable encoders whose CRTC is about to change */ 261 if (encoder_funcs->get_crtc && 262 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 263 drm_encoder_disable(encoder); 264 } 265 } 266 267 /** 268 * drm_crtc_helper_set_mode - internal helper to set a mode 269 * @crtc: CRTC to program 270 * @mode: mode to use 271 * @x: horizontal offset into the surface 272 * @y: vertical offset into the surface 273 * @old_fb: old framebuffer, for cleanup 274 * 275 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 276 * to fixup or reject the mode prior to trying to set it. This is an internal 277 * helper that drivers could e.g. use to update properties that require the 278 * entire output pipe to be disabled and re-enabled in a new configuration. For 279 * example for changing whether audio is enabled on a hdmi link or for changing 280 * panel fitter or dither attributes. It is also called by the 281 * drm_crtc_helper_set_config() helper function to drive the mode setting 282 * sequence. 283 * 284 * Returns: 285 * True if the mode was set successfully, false otherwise. 286 */ 287 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 288 struct drm_display_mode *mode, 289 int x, int y, 290 struct drm_framebuffer *old_fb) 291 { 292 struct drm_device *dev = crtc->dev; 293 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 294 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 295 const struct drm_encoder_helper_funcs *encoder_funcs; 296 int saved_x, saved_y; 297 bool saved_enabled; 298 struct drm_encoder *encoder; 299 bool ret = true; 300 301 drm_warn_on_modeset_not_all_locked(dev); 302 303 saved_enabled = crtc->enabled; 304 crtc->enabled = drm_helper_crtc_in_use(crtc); 305 if (!crtc->enabled) 306 return true; 307 308 adjusted_mode = drm_mode_duplicate(dev, mode); 309 if (!adjusted_mode) { 310 crtc->enabled = saved_enabled; 311 return false; 312 } 313 314 saved_mode = crtc->mode; 315 saved_hwmode = crtc->hwmode; 316 saved_x = crtc->x; 317 saved_y = crtc->y; 318 319 /* Update crtc values up front so the driver can rely on them for mode 320 * setting. 321 */ 322 crtc->mode = *mode; 323 crtc->x = x; 324 crtc->y = y; 325 326 /* Pass our mode to the connectors and the CRTC to give them a chance to 327 * adjust it according to limitations or connector properties, and also 328 * a chance to reject the mode entirely. 329 */ 330 drm_for_each_encoder(encoder, dev) { 331 332 if (encoder->crtc != crtc) 333 continue; 334 335 encoder_funcs = encoder->helper_private; 336 if (!encoder_funcs) 337 continue; 338 339 ret = drm_bridge_mode_fixup(encoder->bridge, 340 mode, adjusted_mode); 341 if (!ret) { 342 DRM_DEBUG_KMS("Bridge fixup failed\n"); 343 goto done; 344 } 345 346 encoder_funcs = encoder->helper_private; 347 if (encoder_funcs->mode_fixup) { 348 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 349 adjusted_mode))) { 350 DRM_DEBUG_KMS("Encoder fixup failed\n"); 351 goto done; 352 } 353 } 354 } 355 356 if (crtc_funcs->mode_fixup) { 357 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 358 adjusted_mode))) { 359 DRM_DEBUG_KMS("CRTC fixup failed\n"); 360 goto done; 361 } 362 } 363 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 364 365 crtc->hwmode = *adjusted_mode; 366 367 /* Prepare the encoders and CRTCs before setting the mode. */ 368 drm_for_each_encoder(encoder, dev) { 369 370 if (encoder->crtc != crtc) 371 continue; 372 373 encoder_funcs = encoder->helper_private; 374 if (!encoder_funcs) 375 continue; 376 377 drm_bridge_disable(encoder->bridge); 378 379 /* Disable the encoders as the first thing we do. */ 380 if (encoder_funcs->prepare) 381 encoder_funcs->prepare(encoder); 382 383 drm_bridge_post_disable(encoder->bridge); 384 } 385 386 drm_crtc_prepare_encoders(dev); 387 388 crtc_funcs->prepare(crtc); 389 390 /* Set up the DPLL and any encoders state that needs to adjust or depend 391 * on the DPLL. 392 */ 393 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 394 if (!ret) 395 goto done; 396 397 drm_for_each_encoder(encoder, dev) { 398 399 if (encoder->crtc != crtc) 400 continue; 401 402 encoder_funcs = encoder->helper_private; 403 if (!encoder_funcs) 404 continue; 405 406 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 407 encoder->base.id, encoder->name, 408 mode->base.id, mode->name); 409 if (encoder_funcs->mode_set) 410 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 411 412 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode); 413 } 414 415 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 416 crtc_funcs->commit(crtc); 417 418 drm_for_each_encoder(encoder, dev) { 419 420 if (encoder->crtc != crtc) 421 continue; 422 423 encoder_funcs = encoder->helper_private; 424 if (!encoder_funcs) 425 continue; 426 427 drm_bridge_pre_enable(encoder->bridge); 428 429 if (encoder_funcs->commit) 430 encoder_funcs->commit(encoder); 431 432 drm_bridge_enable(encoder->bridge); 433 } 434 435 /* Calculate and store various constants which 436 * are later needed by vblank and swap-completion 437 * timestamping. They are derived from true hwmode. 438 */ 439 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 440 441 /* FIXME: add subpixel order */ 442 done: 443 drm_mode_destroy(dev, adjusted_mode); 444 if (!ret) { 445 crtc->enabled = saved_enabled; 446 crtc->mode = saved_mode; 447 crtc->hwmode = saved_hwmode; 448 crtc->x = saved_x; 449 crtc->y = saved_y; 450 } 451 452 return ret; 453 } 454 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 455 456 static void 457 drm_crtc_helper_disable(struct drm_crtc *crtc) 458 { 459 struct drm_device *dev = crtc->dev; 460 struct drm_connector *connector; 461 struct drm_encoder *encoder; 462 463 /* Decouple all encoders and their attached connectors from this crtc */ 464 drm_for_each_encoder(encoder, dev) { 465 if (encoder->crtc != crtc) 466 continue; 467 468 drm_for_each_connector(connector, dev) { 469 if (connector->encoder != encoder) 470 continue; 471 472 connector->encoder = NULL; 473 474 /* 475 * drm_helper_disable_unused_functions() ought to be 476 * doing this, but since we've decoupled the encoder 477 * from the connector above, the required connection 478 * between them is henceforth no longer available. 479 */ 480 connector->dpms = DRM_MODE_DPMS_OFF; 481 482 /* we keep a reference while the encoder is bound */ 483 drm_connector_unreference(connector); 484 } 485 } 486 487 __drm_helper_disable_unused_functions(dev); 488 } 489 490 /** 491 * drm_crtc_helper_set_config - set a new config from userspace 492 * @set: mode set configuration 493 * 494 * The drm_crtc_helper_set_config() helper function implements the set_config 495 * callback of struct &drm_crtc_funcs for drivers using the legacy CRTC helpers. 496 * 497 * It first tries to locate the best encoder for each connector by calling the 498 * connector ->best_encoder() (struct &drm_connector_helper_funcs) helper 499 * operation. 500 * 501 * After locating the appropriate encoders, the helper function will call the 502 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 503 * or reject it completely in which case an error will be returned to the 504 * application. If the new configuration after mode adjustment is identical to 505 * the current configuration the helper function will return without performing 506 * any other operation. 507 * 508 * If the adjusted mode is identical to the current mode but changes to the 509 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 510 * will call the CRTC ->mode_set_base() (struct &drm_crtc_helper_funcs) helper 511 * operation. 512 * 513 * If the adjusted mode differs from the current mode, or if the 514 * ->mode_set_base() helper operation is not provided, the helper function 515 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 516 * and ->commit() CRTC and encoder helper operations, in that order. 517 * Alternatively it can also use the dpms and disable helper operations. For 518 * details see struct &drm_crtc_helper_funcs and struct 519 * &drm_encoder_helper_funcs. 520 * 521 * This function is deprecated. New drivers must implement atomic modeset 522 * support, for which this function is unsuitable. Instead drivers should use 523 * drm_atomic_helper_set_config(). 524 * 525 * Returns: 526 * Returns 0 on success, negative errno numbers on failure. 527 */ 528 int drm_crtc_helper_set_config(struct drm_mode_set *set) 529 { 530 struct drm_device *dev; 531 struct drm_crtc *new_crtc; 532 struct drm_encoder *save_encoders, *new_encoder, *encoder; 533 bool mode_changed = false; /* if true do a full mode set */ 534 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 535 struct drm_connector *save_connectors, *connector; 536 int count = 0, ro, fail = 0; 537 const struct drm_crtc_helper_funcs *crtc_funcs; 538 struct drm_mode_set save_set; 539 int ret; 540 int i; 541 542 DRM_DEBUG_KMS("\n"); 543 544 BUG_ON(!set); 545 BUG_ON(!set->crtc); 546 BUG_ON(!set->crtc->helper_private); 547 548 /* Enforce sane interface api - has been abused by the fb helper. */ 549 BUG_ON(!set->mode && set->fb); 550 BUG_ON(set->fb && set->num_connectors == 0); 551 552 crtc_funcs = set->crtc->helper_private; 553 554 if (!set->mode) 555 set->fb = NULL; 556 557 if (set->fb) { 558 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 559 set->crtc->base.id, set->crtc->name, 560 set->fb->base.id, 561 (int)set->num_connectors, set->x, set->y); 562 } else { 563 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 564 set->crtc->base.id, set->crtc->name); 565 drm_crtc_helper_disable(set->crtc); 566 return 0; 567 } 568 569 dev = set->crtc->dev; 570 571 drm_warn_on_modeset_not_all_locked(dev); 572 573 /* 574 * Allocate space for the backup of all (non-pointer) encoder and 575 * connector data. 576 */ 577 save_encoders = kzalloc(dev->mode_config.num_encoder * 578 sizeof(struct drm_encoder), GFP_KERNEL); 579 if (!save_encoders) 580 return -ENOMEM; 581 582 save_connectors = kzalloc(dev->mode_config.num_connector * 583 sizeof(struct drm_connector), GFP_KERNEL); 584 if (!save_connectors) { 585 kfree(save_encoders); 586 return -ENOMEM; 587 } 588 589 /* 590 * Copy data. Note that driver private data is not affected. 591 * Should anything bad happen only the expected state is 592 * restored, not the drivers personal bookkeeping. 593 */ 594 count = 0; 595 drm_for_each_encoder(encoder, dev) { 596 save_encoders[count++] = *encoder; 597 } 598 599 count = 0; 600 drm_for_each_connector(connector, dev) { 601 save_connectors[count++] = *connector; 602 } 603 604 save_set.crtc = set->crtc; 605 save_set.mode = &set->crtc->mode; 606 save_set.x = set->crtc->x; 607 save_set.y = set->crtc->y; 608 save_set.fb = set->crtc->primary->fb; 609 610 /* We should be able to check here if the fb has the same properties 611 * and then just flip_or_move it */ 612 if (set->crtc->primary->fb != set->fb) { 613 /* If we have no fb then treat it as a full mode set */ 614 if (set->crtc->primary->fb == NULL) { 615 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 616 mode_changed = true; 617 } else if (set->fb->pixel_format != 618 set->crtc->primary->fb->pixel_format) { 619 mode_changed = true; 620 } else 621 fb_changed = true; 622 } 623 624 if (set->x != set->crtc->x || set->y != set->crtc->y) 625 fb_changed = true; 626 627 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 628 DRM_DEBUG_KMS("modes are different, full mode set\n"); 629 drm_mode_debug_printmodeline(&set->crtc->mode); 630 drm_mode_debug_printmodeline(set->mode); 631 mode_changed = true; 632 } 633 634 /* take a reference on all connectors in set */ 635 for (ro = 0; ro < set->num_connectors; ro++) { 636 drm_connector_reference(set->connectors[ro]); 637 } 638 639 /* a) traverse passed in connector list and get encoders for them */ 640 count = 0; 641 drm_for_each_connector(connector, dev) { 642 const struct drm_connector_helper_funcs *connector_funcs = 643 connector->helper_private; 644 new_encoder = connector->encoder; 645 for (ro = 0; ro < set->num_connectors; ro++) { 646 if (set->connectors[ro] == connector) { 647 new_encoder = connector_funcs->best_encoder(connector); 648 /* if we can't get an encoder for a connector 649 we are setting now - then fail */ 650 if (new_encoder == NULL) 651 /* don't break so fail path works correct */ 652 fail = 1; 653 654 if (connector->dpms != DRM_MODE_DPMS_ON) { 655 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 656 mode_changed = true; 657 } 658 659 break; 660 } 661 } 662 663 if (new_encoder != connector->encoder) { 664 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 665 mode_changed = true; 666 /* If the encoder is reused for another connector, then 667 * the appropriate crtc will be set later. 668 */ 669 if (connector->encoder) 670 connector->encoder->crtc = NULL; 671 connector->encoder = new_encoder; 672 } 673 } 674 675 if (fail) { 676 ret = -EINVAL; 677 goto fail; 678 } 679 680 count = 0; 681 drm_for_each_connector(connector, dev) { 682 if (!connector->encoder) 683 continue; 684 685 if (connector->encoder->crtc == set->crtc) 686 new_crtc = NULL; 687 else 688 new_crtc = connector->encoder->crtc; 689 690 for (ro = 0; ro < set->num_connectors; ro++) { 691 if (set->connectors[ro] == connector) 692 new_crtc = set->crtc; 693 } 694 695 /* Make sure the new CRTC will work with the encoder */ 696 if (new_crtc && 697 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 698 ret = -EINVAL; 699 goto fail; 700 } 701 if (new_crtc != connector->encoder->crtc) { 702 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 703 mode_changed = true; 704 connector->encoder->crtc = new_crtc; 705 } 706 if (new_crtc) { 707 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 708 connector->base.id, connector->name, 709 new_crtc->base.id, new_crtc->name); 710 } else { 711 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 712 connector->base.id, connector->name); 713 } 714 } 715 716 /* mode_set_base is not a required function */ 717 if (fb_changed && !crtc_funcs->mode_set_base) 718 mode_changed = true; 719 720 if (mode_changed) { 721 if (drm_helper_crtc_in_use(set->crtc)) { 722 DRM_DEBUG_KMS("attempting to set mode from" 723 " userspace\n"); 724 drm_mode_debug_printmodeline(set->mode); 725 set->crtc->primary->fb = set->fb; 726 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 727 set->x, set->y, 728 save_set.fb)) { 729 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 730 set->crtc->base.id, set->crtc->name); 731 set->crtc->primary->fb = save_set.fb; 732 ret = -EINVAL; 733 goto fail; 734 } 735 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 736 for (i = 0; i < set->num_connectors; i++) { 737 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 738 set->connectors[i]->name); 739 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 740 } 741 } 742 __drm_helper_disable_unused_functions(dev); 743 } else if (fb_changed) { 744 set->crtc->x = set->x; 745 set->crtc->y = set->y; 746 set->crtc->primary->fb = set->fb; 747 ret = crtc_funcs->mode_set_base(set->crtc, 748 set->x, set->y, save_set.fb); 749 if (ret != 0) { 750 set->crtc->x = save_set.x; 751 set->crtc->y = save_set.y; 752 set->crtc->primary->fb = save_set.fb; 753 goto fail; 754 } 755 } 756 757 /* after fail drop reference on all connectors in save set */ 758 count = 0; 759 drm_for_each_connector(connector, dev) { 760 drm_connector_unreference(&save_connectors[count++]); 761 } 762 763 kfree(save_connectors); 764 kfree(save_encoders); 765 return 0; 766 767 fail: 768 /* Restore all previous data. */ 769 count = 0; 770 drm_for_each_encoder(encoder, dev) { 771 *encoder = save_encoders[count++]; 772 } 773 774 count = 0; 775 drm_for_each_connector(connector, dev) { 776 *connector = save_connectors[count++]; 777 } 778 779 /* after fail drop reference on all connectors in set */ 780 for (ro = 0; ro < set->num_connectors; ro++) { 781 drm_connector_unreference(set->connectors[ro]); 782 } 783 784 /* Try to restore the config */ 785 if (mode_changed && 786 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 787 save_set.y, save_set.fb)) 788 DRM_ERROR("failed to restore config after modeset failure\n"); 789 790 kfree(save_connectors); 791 kfree(save_encoders); 792 return ret; 793 } 794 EXPORT_SYMBOL(drm_crtc_helper_set_config); 795 796 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 797 { 798 int dpms = DRM_MODE_DPMS_OFF; 799 struct drm_connector *connector; 800 struct drm_device *dev = encoder->dev; 801 802 drm_for_each_connector(connector, dev) 803 if (connector->encoder == encoder) 804 if (connector->dpms < dpms) 805 dpms = connector->dpms; 806 return dpms; 807 } 808 809 /* Helper which handles bridge ordering around encoder dpms */ 810 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 811 { 812 struct drm_bridge *bridge = encoder->bridge; 813 const struct drm_encoder_helper_funcs *encoder_funcs; 814 815 encoder_funcs = encoder->helper_private; 816 if (!encoder_funcs) 817 return; 818 819 if (mode == DRM_MODE_DPMS_ON) 820 drm_bridge_pre_enable(bridge); 821 else 822 drm_bridge_disable(bridge); 823 824 if (encoder_funcs->dpms) 825 encoder_funcs->dpms(encoder, mode); 826 827 if (mode == DRM_MODE_DPMS_ON) 828 drm_bridge_enable(bridge); 829 else 830 drm_bridge_post_disable(bridge); 831 } 832 833 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 834 { 835 int dpms = DRM_MODE_DPMS_OFF; 836 struct drm_connector *connector; 837 struct drm_device *dev = crtc->dev; 838 839 drm_for_each_connector(connector, dev) 840 if (connector->encoder && connector->encoder->crtc == crtc) 841 if (connector->dpms < dpms) 842 dpms = connector->dpms; 843 return dpms; 844 } 845 846 /** 847 * drm_helper_connector_dpms() - connector dpms helper implementation 848 * @connector: affected connector 849 * @mode: DPMS mode 850 * 851 * The drm_helper_connector_dpms() helper function implements the ->dpms() 852 * callback of struct &drm_connector_funcs for drivers using the legacy CRTC helpers. 853 * 854 * This is the main helper function provided by the CRTC helper framework for 855 * implementing the DPMS connector attribute. It computes the new desired DPMS 856 * state for all encoders and CRTCs in the output mesh and calls the ->dpms() 857 * callbacks provided by the driver in struct &drm_crtc_helper_funcs and struct 858 * &drm_encoder_helper_funcs appropriately. 859 * 860 * This function is deprecated. New drivers must implement atomic modeset 861 * support, for which this function is unsuitable. Instead drivers should use 862 * drm_atomic_helper_connector_dpms(). 863 * 864 * Returns: 865 * Always returns 0. 866 */ 867 int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 868 { 869 struct drm_encoder *encoder = connector->encoder; 870 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 871 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 872 873 if (mode == connector->dpms) 874 return 0; 875 876 old_dpms = connector->dpms; 877 connector->dpms = mode; 878 879 if (encoder) 880 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 881 882 /* from off to on, do crtc then encoder */ 883 if (mode < old_dpms) { 884 if (crtc) { 885 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 886 if (crtc_funcs->dpms) 887 (*crtc_funcs->dpms) (crtc, 888 drm_helper_choose_crtc_dpms(crtc)); 889 } 890 if (encoder) 891 drm_helper_encoder_dpms(encoder, encoder_dpms); 892 } 893 894 /* from on to off, do encoder then crtc */ 895 if (mode > old_dpms) { 896 if (encoder) 897 drm_helper_encoder_dpms(encoder, encoder_dpms); 898 if (crtc) { 899 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 900 if (crtc_funcs->dpms) 901 (*crtc_funcs->dpms) (crtc, 902 drm_helper_choose_crtc_dpms(crtc)); 903 } 904 } 905 906 return 0; 907 } 908 EXPORT_SYMBOL(drm_helper_connector_dpms); 909 910 /** 911 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata 912 * @fb: drm_framebuffer object to fill out 913 * @mode_cmd: metadata from the userspace fb creation request 914 * 915 * This helper can be used in a drivers fb_create callback to pre-fill the fb's 916 * metadata fields. 917 */ 918 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 919 const struct drm_mode_fb_cmd2 *mode_cmd) 920 { 921 int i; 922 923 fb->width = mode_cmd->width; 924 fb->height = mode_cmd->height; 925 for (i = 0; i < 4; i++) { 926 fb->pitches[i] = mode_cmd->pitches[i]; 927 fb->offsets[i] = mode_cmd->offsets[i]; 928 fb->modifier[i] = mode_cmd->modifier[i]; 929 } 930 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, 931 &fb->bits_per_pixel); 932 fb->pixel_format = mode_cmd->pixel_format; 933 fb->flags = mode_cmd->flags; 934 } 935 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 936 937 /** 938 * drm_helper_resume_force_mode - force-restore mode setting configuration 939 * @dev: drm_device which should be restored 940 * 941 * Drivers which use the mode setting helpers can use this function to 942 * force-restore the mode setting configuration e.g. on resume or when something 943 * else might have trampled over the hw state (like some overzealous old BIOSen 944 * tended to do). 945 * 946 * This helper doesn't provide a error return value since restoring the old 947 * config should never fail due to resource allocation issues since the driver 948 * has successfully set the restored configuration already. Hence this should 949 * boil down to the equivalent of a few dpms on calls, which also don't provide 950 * an error code. 951 * 952 * Drivers where simply restoring an old configuration again might fail (e.g. 953 * due to slight differences in allocating shared resources when the 954 * configuration is restored in a different order than when userspace set it up) 955 * need to use their own restore logic. 956 * 957 * This function is deprecated. New drivers should implement atomic mode- 958 * setting and use the atomic suspend/resume helpers. 959 * 960 * See also: 961 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 962 */ 963 void drm_helper_resume_force_mode(struct drm_device *dev) 964 { 965 struct drm_crtc *crtc; 966 struct drm_encoder *encoder; 967 const struct drm_crtc_helper_funcs *crtc_funcs; 968 int encoder_dpms; 969 bool ret; 970 971 drm_modeset_lock_all(dev); 972 drm_for_each_crtc(crtc, dev) { 973 974 if (!crtc->enabled) 975 continue; 976 977 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 978 crtc->x, crtc->y, crtc->primary->fb); 979 980 /* Restoring the old config should never fail! */ 981 if (ret == false) 982 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 983 984 /* Turn off outputs that were already powered off */ 985 if (drm_helper_choose_crtc_dpms(crtc)) { 986 drm_for_each_encoder(encoder, dev) { 987 988 if(encoder->crtc != crtc) 989 continue; 990 991 encoder_dpms = drm_helper_choose_encoder_dpms( 992 encoder); 993 994 drm_helper_encoder_dpms(encoder, encoder_dpms); 995 } 996 997 crtc_funcs = crtc->helper_private; 998 if (crtc_funcs->dpms) 999 (*crtc_funcs->dpms) (crtc, 1000 drm_helper_choose_crtc_dpms(crtc)); 1001 } 1002 } 1003 1004 /* disable the unused connectors while restoring the modesetting */ 1005 __drm_helper_disable_unused_functions(dev); 1006 drm_modeset_unlock_all(dev); 1007 } 1008 EXPORT_SYMBOL(drm_helper_resume_force_mode); 1009 1010 /** 1011 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers 1012 * @crtc: DRM CRTC 1013 * @mode: DRM display mode which userspace requested 1014 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks 1015 * @x: x offset of the CRTC scanout area on the underlying framebuffer 1016 * @y: y offset of the CRTC scanout area on the underlying framebuffer 1017 * @old_fb: previous framebuffer 1018 * 1019 * This function implements a callback useable as the ->mode_set callback 1020 * required by the CRTC helpers. Besides the atomic plane helper functions for 1021 * the primary plane the driver must also provide the ->mode_set_nofb callback 1022 * to set up the CRTC. 1023 * 1024 * This is a transitional helper useful for converting drivers to the atomic 1025 * interfaces. 1026 */ 1027 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode, 1028 struct drm_display_mode *adjusted_mode, int x, int y, 1029 struct drm_framebuffer *old_fb) 1030 { 1031 struct drm_crtc_state *crtc_state; 1032 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 1033 int ret; 1034 1035 if (crtc->funcs->atomic_duplicate_state) 1036 crtc_state = crtc->funcs->atomic_duplicate_state(crtc); 1037 else { 1038 if (!crtc->state) 1039 drm_atomic_helper_crtc_reset(crtc); 1040 1041 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc); 1042 } 1043 1044 if (!crtc_state) 1045 return -ENOMEM; 1046 1047 crtc_state->planes_changed = true; 1048 crtc_state->mode_changed = true; 1049 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode); 1050 if (ret) 1051 goto out; 1052 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode); 1053 1054 if (crtc_funcs->atomic_check) { 1055 ret = crtc_funcs->atomic_check(crtc, crtc_state); 1056 if (ret) 1057 goto out; 1058 } 1059 1060 swap(crtc->state, crtc_state); 1061 1062 crtc_funcs->mode_set_nofb(crtc); 1063 1064 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb); 1065 1066 out: 1067 if (crtc_state) { 1068 if (crtc->funcs->atomic_destroy_state) 1069 crtc->funcs->atomic_destroy_state(crtc, crtc_state); 1070 else 1071 drm_atomic_helper_crtc_destroy_state(crtc, crtc_state); 1072 } 1073 1074 return ret; 1075 } 1076 EXPORT_SYMBOL(drm_helper_crtc_mode_set); 1077 1078 /** 1079 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers 1080 * @crtc: DRM CRTC 1081 * @x: x offset of the CRTC scanout area on the underlying framebuffer 1082 * @y: y offset of the CRTC scanout area on the underlying framebuffer 1083 * @old_fb: previous framebuffer 1084 * 1085 * This function implements a callback useable as the ->mode_set_base used 1086 * required by the CRTC helpers. The driver must provide the atomic plane helper 1087 * functions for the primary plane. 1088 * 1089 * This is a transitional helper useful for converting drivers to the atomic 1090 * interfaces. 1091 */ 1092 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y, 1093 struct drm_framebuffer *old_fb) 1094 { 1095 struct drm_plane_state *plane_state; 1096 struct drm_plane *plane = crtc->primary; 1097 1098 if (plane->funcs->atomic_duplicate_state) 1099 plane_state = plane->funcs->atomic_duplicate_state(plane); 1100 else { 1101 if (!plane->state) 1102 drm_atomic_helper_plane_reset(plane); 1103 1104 plane_state = drm_atomic_helper_plane_duplicate_state(plane); 1105 } 1106 if (!plane_state) 1107 return -ENOMEM; 1108 plane_state->plane = plane; 1109 1110 plane_state->crtc = crtc; 1111 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb); 1112 plane_state->crtc_x = 0; 1113 plane_state->crtc_y = 0; 1114 plane_state->crtc_h = crtc->mode.vdisplay; 1115 plane_state->crtc_w = crtc->mode.hdisplay; 1116 plane_state->src_x = x << 16; 1117 plane_state->src_y = y << 16; 1118 plane_state->src_h = crtc->mode.vdisplay << 16; 1119 plane_state->src_w = crtc->mode.hdisplay << 16; 1120 1121 return drm_plane_helper_commit(plane, plane_state, old_fb); 1122 } 1123 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base); 1124 1125 /** 1126 * drm_helper_crtc_enable_color_mgmt - enable color management properties 1127 * @crtc: DRM CRTC 1128 * @degamma_lut_size: the size of the degamma lut (before CSC) 1129 * @gamma_lut_size: the size of the gamma lut (after CSC) 1130 * 1131 * This function lets the driver enable the color correction properties on a 1132 * CRTC. This includes 3 degamma, csc and gamma properties that userspace can 1133 * set and 2 size properties to inform the userspace of the lut sizes. 1134 */ 1135 void drm_helper_crtc_enable_color_mgmt(struct drm_crtc *crtc, 1136 int degamma_lut_size, 1137 int gamma_lut_size) 1138 { 1139 struct drm_device *dev = crtc->dev; 1140 struct drm_mode_config *config = &dev->mode_config; 1141 1142 drm_object_attach_property(&crtc->base, 1143 config->degamma_lut_property, 0); 1144 drm_object_attach_property(&crtc->base, 1145 config->ctm_property, 0); 1146 drm_object_attach_property(&crtc->base, 1147 config->gamma_lut_property, 0); 1148 1149 drm_object_attach_property(&crtc->base, 1150 config->degamma_lut_size_property, 1151 degamma_lut_size); 1152 drm_object_attach_property(&crtc->base, 1153 config->gamma_lut_size_property, 1154 gamma_lut_size); 1155 } 1156 EXPORT_SYMBOL(drm_helper_crtc_enable_color_mgmt); 1157