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_framebuffer.h> 48 #include <drm/drm_plane_helper.h> 49 #include <drm/drm_print.h> 50 #include <drm/drm_vblank.h> 51 52 #include "drm_crtc_helper_internal.h" 53 54 /** 55 * DOC: overview 56 * 57 * The CRTC modeset helper library provides a default set_config implementation 58 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 59 * the same callbacks which drivers can use to e.g. restore the modeset 60 * configuration on resume with drm_helper_resume_force_mode(). 61 * 62 * Note that this helper library doesn't track the current power state of CRTCs 63 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even 64 * though the hardware is already in the desired state. This deficiency has been 65 * fixed in the atomic helpers. 66 * 67 * The driver callbacks are mostly compatible with the atomic modeset helpers, 68 * except for the handling of the primary plane: Atomic helpers require that the 69 * primary plane is implemented as a real standalone plane and not directly tied 70 * to the CRTC state. For easier transition this library provides functions to 71 * implement the old semantics required by the CRTC helpers using the new plane 72 * and atomic helper callbacks. 73 * 74 * Drivers are strongly urged to convert to the atomic helpers (by way of first 75 * converting to the plane helpers). New drivers must not use these functions 76 * but need to implement the atomic interface instead, potentially using the 77 * atomic helpers for that. 78 * 79 * These legacy modeset helpers use the same function table structures as 80 * all other modesetting helpers. See the documentation for struct 81 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct 82 * &drm_connector_helper_funcs. 83 */ 84 85 /** 86 * drm_helper_encoder_in_use - check if a given encoder is in use 87 * @encoder: encoder to check 88 * 89 * Checks whether @encoder is with the current mode setting output configuration 90 * in use by any connector. This doesn't mean that it is actually enabled since 91 * the DPMS state is tracked separately. 92 * 93 * Returns: 94 * True if @encoder is used, false otherwise. 95 */ 96 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 97 { 98 struct drm_connector *connector; 99 struct drm_connector_list_iter conn_iter; 100 struct drm_device *dev = encoder->dev; 101 102 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 103 104 /* 105 * We can expect this mutex to be locked if we are not panicking. 106 * Locking is currently fubar in the panic handler. 107 */ 108 if (!oops_in_progress) { 109 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 110 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 111 } 112 113 114 drm_connector_list_iter_begin(dev, &conn_iter); 115 drm_for_each_connector_iter(connector, &conn_iter) { 116 if (connector->encoder == encoder) { 117 drm_connector_list_iter_end(&conn_iter); 118 return true; 119 } 120 } 121 drm_connector_list_iter_end(&conn_iter); 122 return false; 123 } 124 EXPORT_SYMBOL(drm_helper_encoder_in_use); 125 126 /** 127 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 128 * @crtc: CRTC to check 129 * 130 * Checks whether @crtc is with the current mode setting output configuration 131 * in use by any connector. This doesn't mean that it is actually enabled since 132 * the DPMS state is tracked separately. 133 * 134 * Returns: 135 * True if @crtc is used, false otherwise. 136 */ 137 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 138 { 139 struct drm_encoder *encoder; 140 struct drm_device *dev = crtc->dev; 141 142 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 143 144 /* 145 * We can expect this mutex to be locked if we are not panicking. 146 * Locking is currently fubar in the panic handler. 147 */ 148 if (!oops_in_progress) 149 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 150 151 drm_for_each_encoder(encoder, dev) 152 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 153 return true; 154 return false; 155 } 156 EXPORT_SYMBOL(drm_helper_crtc_in_use); 157 158 static void 159 drm_encoder_disable(struct drm_encoder *encoder) 160 { 161 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 162 163 if (!encoder_funcs) 164 return; 165 166 if (encoder_funcs->disable) 167 (*encoder_funcs->disable)(encoder); 168 else if (encoder_funcs->dpms) 169 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 170 } 171 172 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 173 { 174 struct drm_encoder *encoder; 175 struct drm_crtc *crtc; 176 177 drm_warn_on_modeset_not_all_locked(dev); 178 179 drm_for_each_encoder(encoder, dev) { 180 if (!drm_helper_encoder_in_use(encoder)) { 181 drm_encoder_disable(encoder); 182 /* disconnect encoder from any connector */ 183 encoder->crtc = NULL; 184 } 185 } 186 187 drm_for_each_crtc(crtc, dev) { 188 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 189 190 crtc->enabled = drm_helper_crtc_in_use(crtc); 191 if (!crtc->enabled) { 192 if (crtc_funcs->disable) 193 (*crtc_funcs->disable)(crtc); 194 else 195 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 196 crtc->primary->fb = NULL; 197 } 198 } 199 } 200 201 /** 202 * drm_helper_disable_unused_functions - disable unused objects 203 * @dev: DRM device 204 * 205 * This function walks through the entire mode setting configuration of @dev. It 206 * will remove any CRTC links of unused encoders and encoder links of 207 * disconnected connectors. Then it will disable all unused encoders and CRTCs 208 * either by calling their disable callback if available or by calling their 209 * dpms callback with DRM_MODE_DPMS_OFF. 210 * 211 * NOTE: 212 * 213 * This function is part of the legacy modeset helper library and will cause 214 * major confusion with atomic drivers. This is because atomic helpers guarantee 215 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 216 * on an enabled functions. drm_helper_disable_unused_functions() on the other 217 * hand throws such guarantees into the wind and calls disable hooks 218 * unconditionally on unused functions. 219 */ 220 void drm_helper_disable_unused_functions(struct drm_device *dev) 221 { 222 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 223 224 drm_modeset_lock_all(dev); 225 __drm_helper_disable_unused_functions(dev); 226 drm_modeset_unlock_all(dev); 227 } 228 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 229 230 /* 231 * Check the CRTC we're going to map each output to vs. its current 232 * CRTC. If they don't match, we have to disable the output and the CRTC 233 * since the driver will have to re-route things. 234 */ 235 static void 236 drm_crtc_prepare_encoders(struct drm_device *dev) 237 { 238 const struct drm_encoder_helper_funcs *encoder_funcs; 239 struct drm_encoder *encoder; 240 241 drm_for_each_encoder(encoder, dev) { 242 encoder_funcs = encoder->helper_private; 243 if (!encoder_funcs) 244 continue; 245 246 /* Disable unused encoders */ 247 if (encoder->crtc == NULL) 248 drm_encoder_disable(encoder); 249 } 250 } 251 252 /** 253 * drm_crtc_helper_set_mode - internal helper to set a mode 254 * @crtc: CRTC to program 255 * @mode: mode to use 256 * @x: horizontal offset into the surface 257 * @y: vertical offset into the surface 258 * @old_fb: old framebuffer, for cleanup 259 * 260 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 261 * to fixup or reject the mode prior to trying to set it. This is an internal 262 * helper that drivers could e.g. use to update properties that require the 263 * entire output pipe to be disabled and re-enabled in a new configuration. For 264 * example for changing whether audio is enabled on a hdmi link or for changing 265 * panel fitter or dither attributes. It is also called by the 266 * drm_crtc_helper_set_config() helper function to drive the mode setting 267 * sequence. 268 * 269 * Returns: 270 * True if the mode was set successfully, false otherwise. 271 */ 272 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 273 struct drm_display_mode *mode, 274 int x, int y, 275 struct drm_framebuffer *old_fb) 276 { 277 struct drm_device *dev = crtc->dev; 278 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 279 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 280 const struct drm_encoder_helper_funcs *encoder_funcs; 281 int saved_x, saved_y; 282 bool saved_enabled; 283 struct drm_encoder *encoder; 284 bool ret = true; 285 286 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 287 288 drm_warn_on_modeset_not_all_locked(dev); 289 290 saved_enabled = crtc->enabled; 291 crtc->enabled = drm_helper_crtc_in_use(crtc); 292 if (!crtc->enabled) 293 return true; 294 295 adjusted_mode = drm_mode_duplicate(dev, mode); 296 if (!adjusted_mode) { 297 crtc->enabled = saved_enabled; 298 return false; 299 } 300 301 drm_mode_init(&saved_mode, &crtc->mode); 302 drm_mode_init(&saved_hwmode, &crtc->hwmode); 303 saved_x = crtc->x; 304 saved_y = crtc->y; 305 306 /* Update crtc values up front so the driver can rely on them for mode 307 * setting. 308 */ 309 drm_mode_copy(&crtc->mode, mode); 310 crtc->x = x; 311 crtc->y = y; 312 313 /* Pass our mode to the connectors and the CRTC to give them a chance to 314 * adjust it according to limitations or connector properties, and also 315 * a chance to reject the mode entirely. 316 */ 317 drm_for_each_encoder(encoder, dev) { 318 319 if (encoder->crtc != crtc) 320 continue; 321 322 encoder_funcs = encoder->helper_private; 323 if (!encoder_funcs) 324 continue; 325 326 encoder_funcs = encoder->helper_private; 327 if (encoder_funcs->mode_fixup) { 328 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 329 adjusted_mode))) { 330 DRM_DEBUG_KMS("Encoder fixup failed\n"); 331 goto done; 332 } 333 } 334 } 335 336 if (crtc_funcs->mode_fixup) { 337 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 338 adjusted_mode))) { 339 DRM_DEBUG_KMS("CRTC fixup failed\n"); 340 goto done; 341 } 342 } 343 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 344 345 drm_mode_copy(&crtc->hwmode, adjusted_mode); 346 347 /* Prepare the encoders and CRTCs before setting the mode. */ 348 drm_for_each_encoder(encoder, dev) { 349 350 if (encoder->crtc != crtc) 351 continue; 352 353 encoder_funcs = encoder->helper_private; 354 if (!encoder_funcs) 355 continue; 356 357 /* Disable the encoders as the first thing we do. */ 358 if (encoder_funcs->prepare) 359 encoder_funcs->prepare(encoder); 360 } 361 362 drm_crtc_prepare_encoders(dev); 363 364 crtc_funcs->prepare(crtc); 365 366 /* Set up the DPLL and any encoders state that needs to adjust or depend 367 * on the DPLL. 368 */ 369 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 370 if (!ret) 371 goto done; 372 373 drm_for_each_encoder(encoder, dev) { 374 375 if (encoder->crtc != crtc) 376 continue; 377 378 encoder_funcs = encoder->helper_private; 379 if (!encoder_funcs) 380 continue; 381 382 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n", 383 encoder->base.id, encoder->name, mode->name); 384 if (encoder_funcs->mode_set) 385 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 386 } 387 388 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 389 crtc_funcs->commit(crtc); 390 391 drm_for_each_encoder(encoder, dev) { 392 393 if (encoder->crtc != crtc) 394 continue; 395 396 encoder_funcs = encoder->helper_private; 397 if (!encoder_funcs) 398 continue; 399 400 if (encoder_funcs->commit) 401 encoder_funcs->commit(encoder); 402 } 403 404 /* Calculate and store various constants which 405 * are later needed by vblank and swap-completion 406 * timestamping. They are derived from true hwmode. 407 */ 408 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 409 410 /* FIXME: add subpixel order */ 411 done: 412 drm_mode_destroy(dev, adjusted_mode); 413 if (!ret) { 414 crtc->enabled = saved_enabled; 415 drm_mode_copy(&crtc->mode, &saved_mode); 416 drm_mode_copy(&crtc->hwmode, &saved_hwmode); 417 crtc->x = saved_x; 418 crtc->y = saved_y; 419 } 420 421 return ret; 422 } 423 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 424 425 static void 426 drm_crtc_helper_disable(struct drm_crtc *crtc) 427 { 428 struct drm_device *dev = crtc->dev; 429 struct drm_connector *connector; 430 struct drm_encoder *encoder; 431 432 /* Decouple all encoders and their attached connectors from this crtc */ 433 drm_for_each_encoder(encoder, dev) { 434 struct drm_connector_list_iter conn_iter; 435 436 if (encoder->crtc != crtc) 437 continue; 438 439 drm_connector_list_iter_begin(dev, &conn_iter); 440 drm_for_each_connector_iter(connector, &conn_iter) { 441 if (connector->encoder != encoder) 442 continue; 443 444 connector->encoder = NULL; 445 446 /* 447 * drm_helper_disable_unused_functions() ought to be 448 * doing this, but since we've decoupled the encoder 449 * from the connector above, the required connection 450 * between them is henceforth no longer available. 451 */ 452 connector->dpms = DRM_MODE_DPMS_OFF; 453 454 /* we keep a reference while the encoder is bound */ 455 drm_connector_put(connector); 456 } 457 drm_connector_list_iter_end(&conn_iter); 458 } 459 460 __drm_helper_disable_unused_functions(dev); 461 } 462 463 /* 464 * For connectors that support multiple encoders, either the 465 * .atomic_best_encoder() or .best_encoder() operation must be implemented. 466 */ 467 struct drm_encoder * 468 drm_connector_get_single_encoder(struct drm_connector *connector) 469 { 470 struct drm_encoder *encoder; 471 472 WARN_ON(hweight32(connector->possible_encoders) > 1); 473 drm_connector_for_each_possible_encoder(connector, encoder) 474 return encoder; 475 476 return NULL; 477 } 478 479 /** 480 * drm_crtc_helper_set_config - set a new config from userspace 481 * @set: mode set configuration 482 * @ctx: lock acquire context, not used here 483 * 484 * The drm_crtc_helper_set_config() helper function implements the of 485 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 486 * helpers. 487 * 488 * It first tries to locate the best encoder for each connector by calling the 489 * connector @drm_connector_helper_funcs.best_encoder helper operation. 490 * 491 * After locating the appropriate encoders, the helper function will call the 492 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 493 * or reject it completely in which case an error will be returned to the 494 * application. If the new configuration after mode adjustment is identical to 495 * the current configuration the helper function will return without performing 496 * any other operation. 497 * 498 * If the adjusted mode is identical to the current mode but changes to the 499 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 500 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 501 * 502 * If the adjusted mode differs from the current mode, or if the 503 * ->mode_set_base() helper operation is not provided, the helper function 504 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 505 * and ->commit() CRTC and encoder helper operations, in that order. 506 * Alternatively it can also use the dpms and disable helper operations. For 507 * details see &struct drm_crtc_helper_funcs and struct 508 * &drm_encoder_helper_funcs. 509 * 510 * This function is deprecated. New drivers must implement atomic modeset 511 * support, for which this function is unsuitable. Instead drivers should use 512 * drm_atomic_helper_set_config(). 513 * 514 * Returns: 515 * Returns 0 on success, negative errno numbers on failure. 516 */ 517 int drm_crtc_helper_set_config(struct drm_mode_set *set, 518 struct drm_modeset_acquire_ctx *ctx) 519 { 520 struct drm_device *dev; 521 struct drm_crtc **save_encoder_crtcs, *new_crtc; 522 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 523 bool mode_changed = false; /* if true do a full mode set */ 524 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 525 struct drm_connector *connector; 526 struct drm_connector_list_iter conn_iter; 527 int count = 0, ro, fail = 0; 528 const struct drm_crtc_helper_funcs *crtc_funcs; 529 struct drm_mode_set save_set; 530 int ret; 531 int i; 532 533 DRM_DEBUG_KMS("\n"); 534 535 BUG_ON(!set); 536 BUG_ON(!set->crtc); 537 BUG_ON(!set->crtc->helper_private); 538 539 /* Enforce sane interface api - has been abused by the fb helper. */ 540 BUG_ON(!set->mode && set->fb); 541 BUG_ON(set->fb && set->num_connectors == 0); 542 543 crtc_funcs = set->crtc->helper_private; 544 545 dev = set->crtc->dev; 546 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 547 548 if (!set->mode) 549 set->fb = NULL; 550 551 if (set->fb) { 552 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 553 set->crtc->base.id, set->crtc->name, 554 set->fb->base.id, 555 (int)set->num_connectors, set->x, set->y); 556 } else { 557 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 558 set->crtc->base.id, set->crtc->name); 559 drm_crtc_helper_disable(set->crtc); 560 return 0; 561 } 562 563 drm_warn_on_modeset_not_all_locked(dev); 564 565 /* 566 * Allocate space for the backup of all (non-pointer) encoder and 567 * connector data. 568 */ 569 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder, 570 sizeof(struct drm_crtc *), GFP_KERNEL); 571 if (!save_encoder_crtcs) 572 return -ENOMEM; 573 574 save_connector_encoders = kcalloc(dev->mode_config.num_connector, 575 sizeof(struct drm_encoder *), GFP_KERNEL); 576 if (!save_connector_encoders) { 577 kfree(save_encoder_crtcs); 578 return -ENOMEM; 579 } 580 581 /* 582 * Copy data. Note that driver private data is not affected. 583 * Should anything bad happen only the expected state is 584 * restored, not the drivers personal bookkeeping. 585 */ 586 count = 0; 587 drm_for_each_encoder(encoder, dev) { 588 save_encoder_crtcs[count++] = encoder->crtc; 589 } 590 591 count = 0; 592 drm_connector_list_iter_begin(dev, &conn_iter); 593 drm_for_each_connector_iter(connector, &conn_iter) 594 save_connector_encoders[count++] = connector->encoder; 595 drm_connector_list_iter_end(&conn_iter); 596 597 save_set.crtc = set->crtc; 598 save_set.mode = &set->crtc->mode; 599 save_set.x = set->crtc->x; 600 save_set.y = set->crtc->y; 601 save_set.fb = set->crtc->primary->fb; 602 603 /* We should be able to check here if the fb has the same properties 604 * and then just flip_or_move it */ 605 if (set->crtc->primary->fb != set->fb) { 606 /* If we have no fb then treat it as a full mode set */ 607 if (set->crtc->primary->fb == NULL) { 608 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 609 mode_changed = true; 610 } else if (set->fb->format != set->crtc->primary->fb->format) { 611 mode_changed = true; 612 } else 613 fb_changed = true; 614 } 615 616 if (set->x != set->crtc->x || set->y != set->crtc->y) 617 fb_changed = true; 618 619 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 620 DRM_DEBUG_KMS("modes are different, full mode set\n"); 621 drm_mode_debug_printmodeline(&set->crtc->mode); 622 drm_mode_debug_printmodeline(set->mode); 623 mode_changed = true; 624 } 625 626 /* take a reference on all unbound connectors in set, reuse the 627 * already taken reference for bound connectors 628 */ 629 for (ro = 0; ro < set->num_connectors; ro++) { 630 if (set->connectors[ro]->encoder) 631 continue; 632 drm_connector_get(set->connectors[ro]); 633 } 634 635 /* a) traverse passed in connector list and get encoders for them */ 636 count = 0; 637 drm_connector_list_iter_begin(dev, &conn_iter); 638 drm_for_each_connector_iter(connector, &conn_iter) { 639 const struct drm_connector_helper_funcs *connector_funcs = 640 connector->helper_private; 641 new_encoder = connector->encoder; 642 for (ro = 0; ro < set->num_connectors; ro++) { 643 if (set->connectors[ro] == connector) { 644 if (connector_funcs->best_encoder) 645 new_encoder = connector_funcs->best_encoder(connector); 646 else 647 new_encoder = drm_connector_get_single_encoder(connector); 648 649 /* if we can't get an encoder for a connector 650 we are setting now - then fail */ 651 if (new_encoder == NULL) 652 /* don't break so fail path works correct */ 653 fail = 1; 654 655 if (connector->dpms != DRM_MODE_DPMS_ON) { 656 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 657 mode_changed = true; 658 } 659 660 break; 661 } 662 } 663 664 if (new_encoder != connector->encoder) { 665 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 666 mode_changed = true; 667 /* If the encoder is reused for another connector, then 668 * the appropriate crtc will be set later. 669 */ 670 if (connector->encoder) 671 connector->encoder->crtc = NULL; 672 connector->encoder = new_encoder; 673 } 674 } 675 drm_connector_list_iter_end(&conn_iter); 676 677 if (fail) { 678 ret = -EINVAL; 679 goto fail; 680 } 681 682 count = 0; 683 drm_connector_list_iter_begin(dev, &conn_iter); 684 drm_for_each_connector_iter(connector, &conn_iter) { 685 if (!connector->encoder) 686 continue; 687 688 if (connector->encoder->crtc == set->crtc) 689 new_crtc = NULL; 690 else 691 new_crtc = connector->encoder->crtc; 692 693 for (ro = 0; ro < set->num_connectors; ro++) { 694 if (set->connectors[ro] == connector) 695 new_crtc = set->crtc; 696 } 697 698 /* Make sure the new CRTC will work with the encoder */ 699 if (new_crtc && 700 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 701 ret = -EINVAL; 702 drm_connector_list_iter_end(&conn_iter); 703 goto fail; 704 } 705 if (new_crtc != connector->encoder->crtc) { 706 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 707 mode_changed = true; 708 connector->encoder->crtc = new_crtc; 709 } 710 if (new_crtc) { 711 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 712 connector->base.id, connector->name, 713 new_crtc->base.id, new_crtc->name); 714 } else { 715 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 716 connector->base.id, connector->name); 717 } 718 } 719 drm_connector_list_iter_end(&conn_iter); 720 721 /* mode_set_base is not a required function */ 722 if (fb_changed && !crtc_funcs->mode_set_base) 723 mode_changed = true; 724 725 if (mode_changed) { 726 if (drm_helper_crtc_in_use(set->crtc)) { 727 DRM_DEBUG_KMS("attempting to set mode from" 728 " userspace\n"); 729 drm_mode_debug_printmodeline(set->mode); 730 set->crtc->primary->fb = set->fb; 731 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 732 set->x, set->y, 733 save_set.fb)) { 734 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 735 set->crtc->base.id, set->crtc->name); 736 set->crtc->primary->fb = save_set.fb; 737 ret = -EINVAL; 738 goto fail; 739 } 740 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 741 for (i = 0; i < set->num_connectors; i++) { 742 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 743 set->connectors[i]->name); 744 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 745 } 746 } 747 __drm_helper_disable_unused_functions(dev); 748 } else if (fb_changed) { 749 set->crtc->x = set->x; 750 set->crtc->y = set->y; 751 set->crtc->primary->fb = set->fb; 752 ret = crtc_funcs->mode_set_base(set->crtc, 753 set->x, set->y, save_set.fb); 754 if (ret != 0) { 755 set->crtc->x = save_set.x; 756 set->crtc->y = save_set.y; 757 set->crtc->primary->fb = save_set.fb; 758 goto fail; 759 } 760 } 761 762 kfree(save_connector_encoders); 763 kfree(save_encoder_crtcs); 764 return 0; 765 766 fail: 767 /* Restore all previous data. */ 768 count = 0; 769 drm_for_each_encoder(encoder, dev) { 770 encoder->crtc = save_encoder_crtcs[count++]; 771 } 772 773 count = 0; 774 drm_connector_list_iter_begin(dev, &conn_iter); 775 drm_for_each_connector_iter(connector, &conn_iter) 776 connector->encoder = save_connector_encoders[count++]; 777 drm_connector_list_iter_end(&conn_iter); 778 779 /* after fail drop reference on all unbound connectors in set, let 780 * bound connectors keep their reference 781 */ 782 for (ro = 0; ro < set->num_connectors; ro++) { 783 if (set->connectors[ro]->encoder) 784 continue; 785 drm_connector_put(set->connectors[ro]); 786 } 787 788 /* Try to restore the config */ 789 if (mode_changed && 790 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 791 save_set.y, save_set.fb)) 792 DRM_ERROR("failed to restore config after modeset failure\n"); 793 794 kfree(save_connector_encoders); 795 kfree(save_encoder_crtcs); 796 return ret; 797 } 798 EXPORT_SYMBOL(drm_crtc_helper_set_config); 799 800 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 801 { 802 int dpms = DRM_MODE_DPMS_OFF; 803 struct drm_connector *connector; 804 struct drm_connector_list_iter conn_iter; 805 struct drm_device *dev = encoder->dev; 806 807 drm_connector_list_iter_begin(dev, &conn_iter); 808 drm_for_each_connector_iter(connector, &conn_iter) 809 if (connector->encoder == encoder) 810 if (connector->dpms < dpms) 811 dpms = connector->dpms; 812 drm_connector_list_iter_end(&conn_iter); 813 814 return dpms; 815 } 816 817 /* Helper which handles bridge ordering around encoder dpms */ 818 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 819 { 820 const struct drm_encoder_helper_funcs *encoder_funcs; 821 822 encoder_funcs = encoder->helper_private; 823 if (!encoder_funcs) 824 return; 825 826 if (encoder_funcs->dpms) 827 encoder_funcs->dpms(encoder, mode); 828 } 829 830 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 831 { 832 int dpms = DRM_MODE_DPMS_OFF; 833 struct drm_connector *connector; 834 struct drm_connector_list_iter conn_iter; 835 struct drm_device *dev = crtc->dev; 836 837 drm_connector_list_iter_begin(dev, &conn_iter); 838 drm_for_each_connector_iter(connector, &conn_iter) 839 if (connector->encoder && connector->encoder->crtc == crtc) 840 if (connector->dpms < dpms) 841 dpms = connector->dpms; 842 drm_connector_list_iter_end(&conn_iter); 843 844 return dpms; 845 } 846 847 /** 848 * drm_helper_connector_dpms() - connector dpms helper implementation 849 * @connector: affected connector 850 * @mode: DPMS mode 851 * 852 * The drm_helper_connector_dpms() helper function implements the 853 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 854 * helpers. 855 * 856 * This is the main helper function provided by the CRTC helper framework for 857 * implementing the DPMS connector attribute. It computes the new desired DPMS 858 * state for all encoders and CRTCs in the output mesh and calls the 859 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 860 * provided by the driver. 861 * 862 * This function is deprecated. New drivers must implement atomic modeset 863 * support, where DPMS is handled in the DRM core. 864 * 865 * Returns: 866 * Always returns 0. 867 */ 868 int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 869 { 870 struct drm_encoder *encoder = connector->encoder; 871 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 872 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 873 874 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev)); 875 876 if (mode == connector->dpms) 877 return 0; 878 879 old_dpms = connector->dpms; 880 connector->dpms = mode; 881 882 if (encoder) 883 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 884 885 /* from off to on, do crtc then encoder */ 886 if (mode < old_dpms) { 887 if (crtc) { 888 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 889 890 if (crtc_funcs->dpms) 891 (*crtc_funcs->dpms) (crtc, 892 drm_helper_choose_crtc_dpms(crtc)); 893 } 894 if (encoder) 895 drm_helper_encoder_dpms(encoder, encoder_dpms); 896 } 897 898 /* from on to off, do encoder then crtc */ 899 if (mode > old_dpms) { 900 if (encoder) 901 drm_helper_encoder_dpms(encoder, encoder_dpms); 902 if (crtc) { 903 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 904 905 if (crtc_funcs->dpms) 906 (*crtc_funcs->dpms) (crtc, 907 drm_helper_choose_crtc_dpms(crtc)); 908 } 909 } 910 911 return 0; 912 } 913 EXPORT_SYMBOL(drm_helper_connector_dpms); 914 915 /** 916 * drm_helper_resume_force_mode - force-restore mode setting configuration 917 * @dev: drm_device which should be restored 918 * 919 * Drivers which use the mode setting helpers can use this function to 920 * force-restore the mode setting configuration e.g. on resume or when something 921 * else might have trampled over the hw state (like some overzealous old BIOSen 922 * tended to do). 923 * 924 * This helper doesn't provide a error return value since restoring the old 925 * config should never fail due to resource allocation issues since the driver 926 * has successfully set the restored configuration already. Hence this should 927 * boil down to the equivalent of a few dpms on calls, which also don't provide 928 * an error code. 929 * 930 * Drivers where simply restoring an old configuration again might fail (e.g. 931 * due to slight differences in allocating shared resources when the 932 * configuration is restored in a different order than when userspace set it up) 933 * need to use their own restore logic. 934 * 935 * This function is deprecated. New drivers should implement atomic mode- 936 * setting and use the atomic suspend/resume helpers. 937 * 938 * See also: 939 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 940 */ 941 void drm_helper_resume_force_mode(struct drm_device *dev) 942 { 943 struct drm_crtc *crtc; 944 struct drm_encoder *encoder; 945 const struct drm_crtc_helper_funcs *crtc_funcs; 946 int encoder_dpms; 947 bool ret; 948 949 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 950 951 drm_modeset_lock_all(dev); 952 drm_for_each_crtc(crtc, dev) { 953 954 if (!crtc->enabled) 955 continue; 956 957 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 958 crtc->x, crtc->y, crtc->primary->fb); 959 960 /* Restoring the old config should never fail! */ 961 if (ret == false) 962 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 963 964 /* Turn off outputs that were already powered off */ 965 if (drm_helper_choose_crtc_dpms(crtc)) { 966 drm_for_each_encoder(encoder, dev) { 967 968 if(encoder->crtc != crtc) 969 continue; 970 971 encoder_dpms = drm_helper_choose_encoder_dpms( 972 encoder); 973 974 drm_helper_encoder_dpms(encoder, encoder_dpms); 975 } 976 977 crtc_funcs = crtc->helper_private; 978 if (crtc_funcs->dpms) 979 (*crtc_funcs->dpms) (crtc, 980 drm_helper_choose_crtc_dpms(crtc)); 981 } 982 } 983 984 /* disable the unused connectors while restoring the modesetting */ 985 __drm_helper_disable_unused_functions(dev); 986 drm_modeset_unlock_all(dev); 987 } 988 EXPORT_SYMBOL(drm_helper_resume_force_mode); 989 990 /** 991 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs 992 * @dev: DRM device whose CRTCs to turn off 993 * 994 * Drivers may want to call this on unload to ensure that all displays are 995 * unlit and the GPU is in a consistent, low power state. Takes modeset locks. 996 * 997 * Note: This should only be used by non-atomic legacy drivers. For an atomic 998 * version look at drm_atomic_helper_shutdown(). 999 * 1000 * Returns: 1001 * Zero on success, error code on failure. 1002 */ 1003 int drm_helper_force_disable_all(struct drm_device *dev) 1004 { 1005 struct drm_crtc *crtc; 1006 int ret = 0; 1007 1008 drm_modeset_lock_all(dev); 1009 drm_for_each_crtc(crtc, dev) 1010 if (crtc->enabled) { 1011 struct drm_mode_set set = { 1012 .crtc = crtc, 1013 }; 1014 1015 ret = drm_mode_set_config_internal(&set); 1016 if (ret) 1017 goto out; 1018 } 1019 out: 1020 drm_modeset_unlock_all(dev); 1021 return ret; 1022 } 1023 EXPORT_SYMBOL(drm_helper_force_disable_all); 1024