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