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