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