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/export.h> 33 #include <linux/kernel.h> 34 #include <linux/moduleparam.h> 35 36 #include <drm/drm_atomic.h> 37 #include <drm/drm_atomic_helper.h> 38 #include <drm/drm_atomic_uapi.h> 39 #include <drm/drm_bridge.h> 40 #include <drm/drm_crtc.h> 41 #include <drm/drm_crtc_helper.h> 42 #include <drm/drm_drv.h> 43 #include <drm/drm_edid.h> 44 #include <drm/drm_encoder.h> 45 #include <drm/drm_fb_helper.h> 46 #include <drm/drm_fourcc.h> 47 #include <drm/drm_plane_helper.h> 48 #include <drm/drm_print.h> 49 #include <drm/drm_vblank.h> 50 51 #include "drm_crtc_helper_internal.h" 52 53 /** 54 * DOC: overview 55 * 56 * The CRTC modeset helper library provides a default set_config implementation 57 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 58 * the same callbacks which drivers can use to e.g. restore the modeset 59 * configuration on resume with drm_helper_resume_force_mode(). 60 * 61 * Note that this helper library doesn't track the current power state of CRTCs 62 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even 63 * though the hardware is already in the desired state. This deficiency has been 64 * fixed in the atomic helpers. 65 * 66 * The driver callbacks are mostly compatible with the atomic modeset helpers, 67 * except for the handling of the primary plane: Atomic helpers require that the 68 * primary plane is implemented as a real standalone plane and not directly tied 69 * to the CRTC state. For easier transition this library provides functions to 70 * implement the old semantics required by the CRTC helpers using the new plane 71 * and atomic helper callbacks. 72 * 73 * Drivers are strongly urged to convert to the atomic helpers (by way of first 74 * converting to the plane helpers). New drivers must not use these functions 75 * but need to implement the atomic interface instead, potentially using the 76 * atomic helpers for that. 77 * 78 * These legacy modeset helpers use the same function table structures as 79 * all other modesetting helpers. See the documentation for struct 80 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct 81 * &drm_connector_helper_funcs. 82 */ 83 84 /** 85 * drm_helper_encoder_in_use - check if a given encoder is in use 86 * @encoder: encoder to check 87 * 88 * Checks whether @encoder is with the current mode setting output configuration 89 * in use by any connector. This doesn't mean that it is actually enabled since 90 * the DPMS state is tracked separately. 91 * 92 * Returns: 93 * True if @encoder is used, false otherwise. 94 */ 95 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 96 { 97 struct drm_connector *connector; 98 struct drm_connector_list_iter conn_iter; 99 struct drm_device *dev = encoder->dev; 100 101 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 102 103 /* 104 * We can expect this mutex to be locked if we are not panicking. 105 * Locking is currently fubar in the panic handler. 106 */ 107 if (!oops_in_progress) { 108 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 109 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 110 } 111 112 113 drm_connector_list_iter_begin(dev, &conn_iter); 114 drm_for_each_connector_iter(connector, &conn_iter) { 115 if (connector->encoder == encoder) { 116 drm_connector_list_iter_end(&conn_iter); 117 return true; 118 } 119 } 120 drm_connector_list_iter_end(&conn_iter); 121 return false; 122 } 123 EXPORT_SYMBOL(drm_helper_encoder_in_use); 124 125 /** 126 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 127 * @crtc: CRTC to check 128 * 129 * Checks whether @crtc is with the current mode setting output configuration 130 * in use by any connector. This doesn't mean that it is actually enabled since 131 * the DPMS state is tracked separately. 132 * 133 * Returns: 134 * True if @crtc is used, false otherwise. 135 */ 136 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 137 { 138 struct drm_encoder *encoder; 139 struct drm_device *dev = crtc->dev; 140 141 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 142 143 /* 144 * We can expect this mutex to be locked if we are not panicking. 145 * Locking is currently fubar in the panic handler. 146 */ 147 if (!oops_in_progress) 148 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 149 150 drm_for_each_encoder(encoder, dev) 151 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 152 return true; 153 return false; 154 } 155 EXPORT_SYMBOL(drm_helper_crtc_in_use); 156 157 static void 158 drm_encoder_disable(struct drm_encoder *encoder) 159 { 160 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 161 162 if (!encoder_funcs) 163 return; 164 165 if (encoder_funcs->disable) 166 (*encoder_funcs->disable)(encoder); 167 else if (encoder_funcs->dpms) 168 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 169 } 170 171 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 172 { 173 struct drm_encoder *encoder; 174 struct drm_crtc *crtc; 175 176 drm_warn_on_modeset_not_all_locked(dev); 177 178 drm_for_each_encoder(encoder, dev) { 179 if (!drm_helper_encoder_in_use(encoder)) { 180 drm_encoder_disable(encoder); 181 /* disconnect encoder from any connector */ 182 encoder->crtc = NULL; 183 } 184 } 185 186 drm_for_each_crtc(crtc, dev) { 187 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 188 189 crtc->enabled = drm_helper_crtc_in_use(crtc); 190 if (!crtc->enabled) { 191 if (crtc_funcs->disable) 192 (*crtc_funcs->disable)(crtc); 193 else 194 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 195 crtc->primary->fb = NULL; 196 } 197 } 198 } 199 200 /** 201 * drm_helper_disable_unused_functions - disable unused objects 202 * @dev: DRM device 203 * 204 * This function walks through the entire mode setting configuration of @dev. It 205 * will remove any CRTC links of unused encoders and encoder links of 206 * disconnected connectors. Then it will disable all unused encoders and CRTCs 207 * either by calling their disable callback if available or by calling their 208 * dpms callback with DRM_MODE_DPMS_OFF. 209 * 210 * NOTE: 211 * 212 * This function is part of the legacy modeset helper library and will cause 213 * major confusion with atomic drivers. This is because atomic helpers guarantee 214 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 215 * on an enabled functions. drm_helper_disable_unused_functions() on the other 216 * hand throws such guarantees into the wind and calls disable hooks 217 * unconditionally on unused functions. 218 */ 219 void drm_helper_disable_unused_functions(struct drm_device *dev) 220 { 221 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 222 223 drm_modeset_lock_all(dev); 224 __drm_helper_disable_unused_functions(dev); 225 drm_modeset_unlock_all(dev); 226 } 227 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 228 229 /* 230 * Check the CRTC we're going to map each output to vs. its current 231 * CRTC. If they don't match, we have to disable the output and the CRTC 232 * since the driver will have to re-route things. 233 */ 234 static void 235 drm_crtc_prepare_encoders(struct drm_device *dev) 236 { 237 const struct drm_encoder_helper_funcs *encoder_funcs; 238 struct drm_encoder *encoder; 239 240 drm_for_each_encoder(encoder, dev) { 241 encoder_funcs = encoder->helper_private; 242 if (!encoder_funcs) 243 continue; 244 245 /* Disable unused encoders */ 246 if (encoder->crtc == NULL) 247 drm_encoder_disable(encoder); 248 } 249 } 250 251 /** 252 * drm_crtc_helper_set_mode - internal helper to set a mode 253 * @crtc: CRTC to program 254 * @mode: mode to use 255 * @x: horizontal offset into the surface 256 * @y: vertical offset into the surface 257 * @old_fb: old framebuffer, for cleanup 258 * 259 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 260 * to fixup or reject the mode prior to trying to set it. This is an internal 261 * helper that drivers could e.g. use to update properties that require the 262 * entire output pipe to be disabled and re-enabled in a new configuration. For 263 * example for changing whether audio is enabled on a hdmi link or for changing 264 * panel fitter or dither attributes. It is also called by the 265 * drm_crtc_helper_set_config() helper function to drive the mode setting 266 * sequence. 267 * 268 * Returns: 269 * True if the mode was set successfully, false otherwise. 270 */ 271 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 272 struct drm_display_mode *mode, 273 int x, int y, 274 struct drm_framebuffer *old_fb) 275 { 276 struct drm_device *dev = crtc->dev; 277 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 278 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 279 const struct drm_encoder_helper_funcs *encoder_funcs; 280 int saved_x, saved_y; 281 bool saved_enabled; 282 struct drm_encoder *encoder; 283 bool ret = true; 284 285 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 286 287 drm_warn_on_modeset_not_all_locked(dev); 288 289 saved_enabled = crtc->enabled; 290 crtc->enabled = drm_helper_crtc_in_use(crtc); 291 if (!crtc->enabled) 292 return true; 293 294 adjusted_mode = drm_mode_duplicate(dev, mode); 295 if (!adjusted_mode) { 296 crtc->enabled = saved_enabled; 297 return false; 298 } 299 300 drm_mode_init(&saved_mode, &crtc->mode); 301 drm_mode_init(&saved_hwmode, &crtc->hwmode); 302 saved_x = crtc->x; 303 saved_y = crtc->y; 304 305 /* Update crtc values up front so the driver can rely on them for mode 306 * setting. 307 */ 308 drm_mode_copy(&crtc->mode, mode); 309 crtc->x = x; 310 crtc->y = y; 311 312 /* Pass our mode to the connectors and the CRTC to give them a chance to 313 * adjust it according to limitations or connector properties, and also 314 * a chance to reject the mode entirely. 315 */ 316 drm_for_each_encoder(encoder, dev) { 317 318 if (encoder->crtc != crtc) 319 continue; 320 321 encoder_funcs = encoder->helper_private; 322 if (!encoder_funcs) 323 continue; 324 325 encoder_funcs = encoder->helper_private; 326 if (encoder_funcs->mode_fixup) { 327 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 328 adjusted_mode))) { 329 DRM_DEBUG_KMS("Encoder fixup failed\n"); 330 goto done; 331 } 332 } 333 } 334 335 if (crtc_funcs->mode_fixup) { 336 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 337 adjusted_mode))) { 338 DRM_DEBUG_KMS("CRTC fixup failed\n"); 339 goto done; 340 } 341 } 342 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 343 344 drm_mode_copy(&crtc->hwmode, adjusted_mode); 345 346 /* Prepare the encoders and CRTCs before setting the mode. */ 347 drm_for_each_encoder(encoder, dev) { 348 349 if (encoder->crtc != crtc) 350 continue; 351 352 encoder_funcs = encoder->helper_private; 353 if (!encoder_funcs) 354 continue; 355 356 /* Disable the encoders as the first thing we do. */ 357 if (encoder_funcs->prepare) 358 encoder_funcs->prepare(encoder); 359 } 360 361 drm_crtc_prepare_encoders(dev); 362 363 crtc_funcs->prepare(crtc); 364 365 /* Set up the DPLL and any encoders state that needs to adjust or depend 366 * on the DPLL. 367 */ 368 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 369 if (!ret) 370 goto done; 371 372 drm_for_each_encoder(encoder, dev) { 373 374 if (encoder->crtc != crtc) 375 continue; 376 377 encoder_funcs = encoder->helper_private; 378 if (!encoder_funcs) 379 continue; 380 381 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n", 382 encoder->base.id, encoder->name, mode->name); 383 if (encoder_funcs->mode_set) 384 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 385 } 386 387 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 388 crtc_funcs->commit(crtc); 389 390 drm_for_each_encoder(encoder, dev) { 391 392 if (encoder->crtc != crtc) 393 continue; 394 395 encoder_funcs = encoder->helper_private; 396 if (!encoder_funcs) 397 continue; 398 399 if (encoder_funcs->commit) 400 encoder_funcs->commit(encoder); 401 } 402 403 /* Calculate and store various constants which 404 * are later needed by vblank and swap-completion 405 * timestamping. They are derived from true hwmode. 406 */ 407 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 408 409 /* FIXME: add subpixel order */ 410 done: 411 drm_mode_destroy(dev, adjusted_mode); 412 if (!ret) { 413 crtc->enabled = saved_enabled; 414 drm_mode_copy(&crtc->mode, &saved_mode); 415 drm_mode_copy(&crtc->hwmode, &saved_hwmode); 416 crtc->x = saved_x; 417 crtc->y = saved_y; 418 } 419 420 return ret; 421 } 422 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 423 424 static void 425 drm_crtc_helper_disable(struct drm_crtc *crtc) 426 { 427 struct drm_device *dev = crtc->dev; 428 struct drm_connector *connector; 429 struct drm_encoder *encoder; 430 431 /* Decouple all encoders and their attached connectors from this crtc */ 432 drm_for_each_encoder(encoder, dev) { 433 struct drm_connector_list_iter conn_iter; 434 435 if (encoder->crtc != crtc) 436 continue; 437 438 drm_connector_list_iter_begin(dev, &conn_iter); 439 drm_for_each_connector_iter(connector, &conn_iter) { 440 if (connector->encoder != encoder) 441 continue; 442 443 connector->encoder = NULL; 444 445 /* 446 * drm_helper_disable_unused_functions() ought to be 447 * doing this, but since we've decoupled the encoder 448 * from the connector above, the required connection 449 * between them is henceforth no longer available. 450 */ 451 connector->dpms = DRM_MODE_DPMS_OFF; 452 453 /* we keep a reference while the encoder is bound */ 454 drm_connector_put(connector); 455 } 456 drm_connector_list_iter_end(&conn_iter); 457 } 458 459 __drm_helper_disable_unused_functions(dev); 460 } 461 462 /* 463 * For connectors that support multiple encoders, either the 464 * .atomic_best_encoder() or .best_encoder() operation must be implemented. 465 */ 466 struct drm_encoder * 467 drm_connector_get_single_encoder(struct drm_connector *connector) 468 { 469 struct drm_encoder *encoder; 470 471 WARN_ON(hweight32(connector->possible_encoders) > 1); 472 drm_connector_for_each_possible_encoder(connector, encoder) 473 return encoder; 474 475 return NULL; 476 } 477 478 /** 479 * drm_crtc_helper_set_config - set a new config from userspace 480 * @set: mode set configuration 481 * @ctx: lock acquire context, not used here 482 * 483 * The drm_crtc_helper_set_config() helper function implements the of 484 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 485 * helpers. 486 * 487 * It first tries to locate the best encoder for each connector by calling the 488 * connector @drm_connector_helper_funcs.best_encoder helper operation. 489 * 490 * After locating the appropriate encoders, the helper function will call the 491 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 492 * or reject it completely in which case an error will be returned to the 493 * application. If the new configuration after mode adjustment is identical to 494 * the current configuration the helper function will return without performing 495 * any other operation. 496 * 497 * If the adjusted mode is identical to the current mode but changes to the 498 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 499 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 500 * 501 * If the adjusted mode differs from the current mode, or if the 502 * ->mode_set_base() helper operation is not provided, the helper function 503 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 504 * and ->commit() CRTC and encoder helper operations, in that order. 505 * Alternatively it can also use the dpms and disable helper operations. For 506 * details see &struct drm_crtc_helper_funcs and struct 507 * &drm_encoder_helper_funcs. 508 * 509 * This function is deprecated. New drivers must implement atomic modeset 510 * support, for which this function is unsuitable. Instead drivers should use 511 * drm_atomic_helper_set_config(). 512 * 513 * Returns: 514 * Returns 0 on success, negative errno numbers on failure. 515 */ 516 int drm_crtc_helper_set_config(struct drm_mode_set *set, 517 struct drm_modeset_acquire_ctx *ctx) 518 { 519 struct drm_device *dev; 520 struct drm_crtc **save_encoder_crtcs, *new_crtc; 521 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 522 bool mode_changed = false; /* if true do a full mode set */ 523 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 524 struct drm_connector *connector; 525 struct drm_connector_list_iter conn_iter; 526 int count = 0, ro, fail = 0; 527 const struct drm_crtc_helper_funcs *crtc_funcs; 528 struct drm_mode_set save_set; 529 int ret; 530 int i; 531 532 DRM_DEBUG_KMS("\n"); 533 534 BUG_ON(!set); 535 BUG_ON(!set->crtc); 536 BUG_ON(!set->crtc->helper_private); 537 538 /* Enforce sane interface api - has been abused by the fb helper. */ 539 BUG_ON(!set->mode && set->fb); 540 BUG_ON(set->fb && set->num_connectors == 0); 541 542 crtc_funcs = set->crtc->helper_private; 543 544 dev = set->crtc->dev; 545 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 546 547 if (!set->mode) 548 set->fb = NULL; 549 550 if (set->fb) { 551 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 552 set->crtc->base.id, set->crtc->name, 553 set->fb->base.id, 554 (int)set->num_connectors, set->x, set->y); 555 } else { 556 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 557 set->crtc->base.id, set->crtc->name); 558 drm_crtc_helper_disable(set->crtc); 559 return 0; 560 } 561 562 drm_warn_on_modeset_not_all_locked(dev); 563 564 /* 565 * Allocate space for the backup of all (non-pointer) encoder and 566 * connector data. 567 */ 568 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder, 569 sizeof(struct drm_crtc *), GFP_KERNEL); 570 if (!save_encoder_crtcs) 571 return -ENOMEM; 572 573 save_connector_encoders = kcalloc(dev->mode_config.num_connector, 574 sizeof(struct drm_encoder *), GFP_KERNEL); 575 if (!save_connector_encoders) { 576 kfree(save_encoder_crtcs); 577 return -ENOMEM; 578 } 579 580 /* 581 * Copy data. Note that driver private data is not affected. 582 * Should anything bad happen only the expected state is 583 * restored, not the drivers personal bookkeeping. 584 */ 585 count = 0; 586 drm_for_each_encoder(encoder, dev) { 587 save_encoder_crtcs[count++] = encoder->crtc; 588 } 589 590 count = 0; 591 drm_connector_list_iter_begin(dev, &conn_iter); 592 drm_for_each_connector_iter(connector, &conn_iter) 593 save_connector_encoders[count++] = connector->encoder; 594 drm_connector_list_iter_end(&conn_iter); 595 596 save_set.crtc = set->crtc; 597 save_set.mode = &set->crtc->mode; 598 save_set.x = set->crtc->x; 599 save_set.y = set->crtc->y; 600 save_set.fb = set->crtc->primary->fb; 601 602 /* We should be able to check here if the fb has the same properties 603 * and then just flip_or_move it */ 604 if (set->crtc->primary->fb != set->fb) { 605 /* If we have no fb then treat it as a full mode set */ 606 if (set->crtc->primary->fb == NULL) { 607 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 608 mode_changed = true; 609 } else if (set->fb->format != set->crtc->primary->fb->format) { 610 mode_changed = true; 611 } else 612 fb_changed = true; 613 } 614 615 if (set->x != set->crtc->x || set->y != set->crtc->y) 616 fb_changed = true; 617 618 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 619 DRM_DEBUG_KMS("modes are different, full mode set\n"); 620 drm_mode_debug_printmodeline(&set->crtc->mode); 621 drm_mode_debug_printmodeline(set->mode); 622 mode_changed = true; 623 } 624 625 /* take a reference on all unbound connectors in set, reuse the 626 * already taken reference for bound connectors 627 */ 628 for (ro = 0; ro < set->num_connectors; ro++) { 629 if (set->connectors[ro]->encoder) 630 continue; 631 drm_connector_get(set->connectors[ro]); 632 } 633 634 /* a) traverse passed in connector list and get encoders for them */ 635 count = 0; 636 drm_connector_list_iter_begin(dev, &conn_iter); 637 drm_for_each_connector_iter(connector, &conn_iter) { 638 const struct drm_connector_helper_funcs *connector_funcs = 639 connector->helper_private; 640 new_encoder = connector->encoder; 641 for (ro = 0; ro < set->num_connectors; ro++) { 642 if (set->connectors[ro] == connector) { 643 if (connector_funcs->best_encoder) 644 new_encoder = connector_funcs->best_encoder(connector); 645 else 646 new_encoder = drm_connector_get_single_encoder(connector); 647 648 /* 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 drm_connector_list_iter_end(&conn_iter); 675 676 if (fail) { 677 ret = -EINVAL; 678 goto fail; 679 } 680 681 count = 0; 682 drm_connector_list_iter_begin(dev, &conn_iter); 683 drm_for_each_connector_iter(connector, &conn_iter) { 684 if (!connector->encoder) 685 continue; 686 687 if (connector->encoder->crtc == set->crtc) 688 new_crtc = NULL; 689 else 690 new_crtc = connector->encoder->crtc; 691 692 for (ro = 0; ro < set->num_connectors; ro++) { 693 if (set->connectors[ro] == connector) 694 new_crtc = set->crtc; 695 } 696 697 /* Make sure the new CRTC will work with the encoder */ 698 if (new_crtc && 699 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 700 ret = -EINVAL; 701 drm_connector_list_iter_end(&conn_iter); 702 goto fail; 703 } 704 if (new_crtc != connector->encoder->crtc) { 705 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 706 mode_changed = true; 707 connector->encoder->crtc = new_crtc; 708 } 709 if (new_crtc) { 710 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 711 connector->base.id, connector->name, 712 new_crtc->base.id, new_crtc->name); 713 } else { 714 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 715 connector->base.id, connector->name); 716 } 717 } 718 drm_connector_list_iter_end(&conn_iter); 719 720 /* mode_set_base is not a required function */ 721 if (fb_changed && !crtc_funcs->mode_set_base) 722 mode_changed = true; 723 724 if (mode_changed) { 725 if (drm_helper_crtc_in_use(set->crtc)) { 726 DRM_DEBUG_KMS("attempting to set mode from" 727 " userspace\n"); 728 drm_mode_debug_printmodeline(set->mode); 729 set->crtc->primary->fb = set->fb; 730 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 731 set->x, set->y, 732 save_set.fb)) { 733 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 734 set->crtc->base.id, set->crtc->name); 735 set->crtc->primary->fb = save_set.fb; 736 ret = -EINVAL; 737 goto fail; 738 } 739 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 740 for (i = 0; i < set->num_connectors; i++) { 741 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 742 set->connectors[i]->name); 743 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 744 } 745 } 746 __drm_helper_disable_unused_functions(dev); 747 } else if (fb_changed) { 748 set->crtc->x = set->x; 749 set->crtc->y = set->y; 750 set->crtc->primary->fb = set->fb; 751 ret = crtc_funcs->mode_set_base(set->crtc, 752 set->x, set->y, save_set.fb); 753 if (ret != 0) { 754 set->crtc->x = save_set.x; 755 set->crtc->y = save_set.y; 756 set->crtc->primary->fb = save_set.fb; 757 goto fail; 758 } 759 } 760 761 kfree(save_connector_encoders); 762 kfree(save_encoder_crtcs); 763 return 0; 764 765 fail: 766 /* Restore all previous data. */ 767 count = 0; 768 drm_for_each_encoder(encoder, dev) { 769 encoder->crtc = save_encoder_crtcs[count++]; 770 } 771 772 count = 0; 773 drm_connector_list_iter_begin(dev, &conn_iter); 774 drm_for_each_connector_iter(connector, &conn_iter) 775 connector->encoder = save_connector_encoders[count++]; 776 drm_connector_list_iter_end(&conn_iter); 777 778 /* after fail drop reference on all unbound connectors in set, let 779 * bound connectors keep their reference 780 */ 781 for (ro = 0; ro < set->num_connectors; ro++) { 782 if (set->connectors[ro]->encoder) 783 continue; 784 drm_connector_put(set->connectors[ro]); 785 } 786 787 /* Try to restore the config */ 788 if (mode_changed && 789 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 790 save_set.y, save_set.fb)) 791 DRM_ERROR("failed to restore config after modeset failure\n"); 792 793 kfree(save_connector_encoders); 794 kfree(save_encoder_crtcs); 795 return ret; 796 } 797 EXPORT_SYMBOL(drm_crtc_helper_set_config); 798 799 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 800 { 801 int dpms = DRM_MODE_DPMS_OFF; 802 struct drm_connector *connector; 803 struct drm_connector_list_iter conn_iter; 804 struct drm_device *dev = encoder->dev; 805 806 drm_connector_list_iter_begin(dev, &conn_iter); 807 drm_for_each_connector_iter(connector, &conn_iter) 808 if (connector->encoder == encoder) 809 if (connector->dpms < dpms) 810 dpms = connector->dpms; 811 drm_connector_list_iter_end(&conn_iter); 812 813 return dpms; 814 } 815 816 /* Helper which handles bridge ordering around encoder dpms */ 817 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 818 { 819 const struct drm_encoder_helper_funcs *encoder_funcs; 820 821 encoder_funcs = encoder->helper_private; 822 if (!encoder_funcs) 823 return; 824 825 if (encoder_funcs->dpms) 826 encoder_funcs->dpms(encoder, mode); 827 } 828 829 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 830 { 831 int dpms = DRM_MODE_DPMS_OFF; 832 struct drm_connector *connector; 833 struct drm_connector_list_iter conn_iter; 834 struct drm_device *dev = crtc->dev; 835 836 drm_connector_list_iter_begin(dev, &conn_iter); 837 drm_for_each_connector_iter(connector, &conn_iter) 838 if (connector->encoder && connector->encoder->crtc == crtc) 839 if (connector->dpms < dpms) 840 dpms = connector->dpms; 841 drm_connector_list_iter_end(&conn_iter); 842 843 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 852 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 853 * helpers. 854 * 855 * This is the main helper function provided by the CRTC helper framework for 856 * implementing the DPMS connector attribute. It computes the new desired DPMS 857 * state for all encoders and CRTCs in the output mesh and calls the 858 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 859 * provided by the driver. 860 * 861 * This function is deprecated. New drivers must implement atomic modeset 862 * support, where DPMS is handled in the DRM core. 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 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev)); 874 875 if (mode == connector->dpms) 876 return 0; 877 878 old_dpms = connector->dpms; 879 connector->dpms = mode; 880 881 if (encoder) 882 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 883 884 /* from off to on, do crtc then encoder */ 885 if (mode < old_dpms) { 886 if (crtc) { 887 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 888 889 if (crtc_funcs->dpms) 890 (*crtc_funcs->dpms) (crtc, 891 drm_helper_choose_crtc_dpms(crtc)); 892 } 893 if (encoder) 894 drm_helper_encoder_dpms(encoder, encoder_dpms); 895 } 896 897 /* from on to off, do encoder then crtc */ 898 if (mode > old_dpms) { 899 if (encoder) 900 drm_helper_encoder_dpms(encoder, encoder_dpms); 901 if (crtc) { 902 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 903 904 if (crtc_funcs->dpms) 905 (*crtc_funcs->dpms) (crtc, 906 drm_helper_choose_crtc_dpms(crtc)); 907 } 908 } 909 910 return 0; 911 } 912 EXPORT_SYMBOL(drm_helper_connector_dpms); 913 914 /** 915 * drm_helper_resume_force_mode - force-restore mode setting configuration 916 * @dev: drm_device which should be restored 917 * 918 * Drivers which use the mode setting helpers can use this function to 919 * force-restore the mode setting configuration e.g. on resume or when something 920 * else might have trampled over the hw state (like some overzealous old BIOSen 921 * tended to do). 922 * 923 * This helper doesn't provide a error return value since restoring the old 924 * config should never fail due to resource allocation issues since the driver 925 * has successfully set the restored configuration already. Hence this should 926 * boil down to the equivalent of a few dpms on calls, which also don't provide 927 * an error code. 928 * 929 * Drivers where simply restoring an old configuration again might fail (e.g. 930 * due to slight differences in allocating shared resources when the 931 * configuration is restored in a different order than when userspace set it up) 932 * need to use their own restore logic. 933 * 934 * This function is deprecated. New drivers should implement atomic mode- 935 * setting and use the atomic suspend/resume helpers. 936 * 937 * See also: 938 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 939 */ 940 void drm_helper_resume_force_mode(struct drm_device *dev) 941 { 942 struct drm_crtc *crtc; 943 struct drm_encoder *encoder; 944 const struct drm_crtc_helper_funcs *crtc_funcs; 945 int encoder_dpms; 946 bool ret; 947 948 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 949 950 drm_modeset_lock_all(dev); 951 drm_for_each_crtc(crtc, dev) { 952 953 if (!crtc->enabled) 954 continue; 955 956 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 957 crtc->x, crtc->y, crtc->primary->fb); 958 959 /* Restoring the old config should never fail! */ 960 if (ret == false) 961 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 962 963 /* Turn off outputs that were already powered off */ 964 if (drm_helper_choose_crtc_dpms(crtc)) { 965 drm_for_each_encoder(encoder, dev) { 966 967 if(encoder->crtc != crtc) 968 continue; 969 970 encoder_dpms = drm_helper_choose_encoder_dpms( 971 encoder); 972 973 drm_helper_encoder_dpms(encoder, encoder_dpms); 974 } 975 976 crtc_funcs = crtc->helper_private; 977 if (crtc_funcs->dpms) 978 (*crtc_funcs->dpms) (crtc, 979 drm_helper_choose_crtc_dpms(crtc)); 980 } 981 } 982 983 /* disable the unused connectors while restoring the modesetting */ 984 __drm_helper_disable_unused_functions(dev); 985 drm_modeset_unlock_all(dev); 986 } 987 EXPORT_SYMBOL(drm_helper_resume_force_mode); 988 989 /** 990 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs 991 * @dev: DRM device whose CRTCs to turn off 992 * 993 * Drivers may want to call this on unload to ensure that all displays are 994 * unlit and the GPU is in a consistent, low power state. Takes modeset locks. 995 * 996 * Note: This should only be used by non-atomic legacy drivers. For an atomic 997 * version look at drm_atomic_helper_shutdown(). 998 * 999 * Returns: 1000 * Zero on success, error code on failure. 1001 */ 1002 int drm_helper_force_disable_all(struct drm_device *dev) 1003 { 1004 struct drm_crtc *crtc; 1005 int ret = 0; 1006 1007 drm_modeset_lock_all(dev); 1008 drm_for_each_crtc(crtc, dev) 1009 if (crtc->enabled) { 1010 struct drm_mode_set set = { 1011 .crtc = crtc, 1012 }; 1013 1014 ret = drm_mode_set_config_internal(&set); 1015 if (ret) 1016 goto out; 1017 } 1018 out: 1019 drm_modeset_unlock_all(dev); 1020 return ret; 1021 } 1022 EXPORT_SYMBOL(drm_helper_force_disable_all); 1023