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/moduleparam.h> 34 35 #include <drm/drmP.h> 36 #include <drm/drm_crtc.h> 37 #include <drm/drm_crtc_helper.h> 38 #include <drm/drm_fb_helper.h> 39 #include <drm/drm_edid.h> 40 41 MODULE_AUTHOR("David Airlie, Jesse Barnes"); 42 MODULE_DESCRIPTION("DRM KMS helper"); 43 MODULE_LICENSE("GPL and additional rights"); 44 45 /** 46 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the 47 * connector list 48 * @dev: drm device to operate on 49 * 50 * Some userspace presumes that the first connected connector is the main 51 * display, where it's supposed to display e.g. the login screen. For 52 * laptops, this should be the main panel. Use this function to sort all 53 * (eDP/LVDS) panels to the front of the connector list, instead of 54 * painstakingly trying to initialize them in the right order. 55 */ 56 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) 57 { 58 struct drm_connector *connector, *tmp; 59 struct list_head panel_list; 60 61 INIT_LIST_HEAD(&panel_list); 62 63 list_for_each_entry_safe(connector, tmp, 64 &dev->mode_config.connector_list, head) { 65 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS || 66 connector->connector_type == DRM_MODE_CONNECTOR_eDP) 67 list_move_tail(&connector->head, &panel_list); 68 } 69 70 list_splice(&panel_list, &dev->mode_config.connector_list); 71 } 72 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 73 74 /** 75 * drm_helper_encoder_in_use - check if a given encoder is in use 76 * @encoder: encoder to check 77 * 78 * Checks whether @encoder is with the current mode setting output configuration 79 * in use by any connector. This doesn't mean that it is actually enabled since 80 * the DPMS state is tracked separately. 81 * 82 * Returns: 83 * True if @encoder is used, false otherwise. 84 */ 85 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 86 { 87 struct drm_connector *connector; 88 struct drm_device *dev = encoder->dev; 89 90 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 91 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 92 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 93 if (connector->encoder == encoder) 94 return true; 95 return false; 96 } 97 EXPORT_SYMBOL(drm_helper_encoder_in_use); 98 99 /** 100 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 101 * @crtc: CRTC to check 102 * 103 * Checks whether @crtc is with the current mode setting output configuration 104 * in use by any connector. This doesn't mean that it is actually enabled since 105 * the DPMS state is tracked separately. 106 * 107 * Returns: 108 * True if @crtc is used, false otherwise. 109 */ 110 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 111 { 112 struct drm_encoder *encoder; 113 struct drm_device *dev = crtc->dev; 114 115 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 116 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 117 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 118 return true; 119 return false; 120 } 121 EXPORT_SYMBOL(drm_helper_crtc_in_use); 122 123 static void 124 drm_encoder_disable(struct drm_encoder *encoder) 125 { 126 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 127 128 if (encoder->bridge) 129 encoder->bridge->funcs->disable(encoder->bridge); 130 131 if (encoder_funcs->disable) 132 (*encoder_funcs->disable)(encoder); 133 else 134 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 135 136 if (encoder->bridge) 137 encoder->bridge->funcs->post_disable(encoder->bridge); 138 } 139 140 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 141 { 142 struct drm_encoder *encoder; 143 struct drm_crtc *crtc; 144 145 drm_warn_on_modeset_not_all_locked(dev); 146 147 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 148 if (!drm_helper_encoder_in_use(encoder)) { 149 drm_encoder_disable(encoder); 150 /* disconnect encoder from any connector */ 151 encoder->crtc = NULL; 152 } 153 } 154 155 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 156 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 157 crtc->enabled = drm_helper_crtc_in_use(crtc); 158 if (!crtc->enabled) { 159 if (crtc_funcs->disable) 160 (*crtc_funcs->disable)(crtc); 161 else 162 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 163 crtc->primary->fb = NULL; 164 } 165 } 166 } 167 168 /** 169 * drm_helper_disable_unused_functions - disable unused objects 170 * @dev: DRM device 171 * 172 * This function walks through the entire mode setting configuration of @dev. It 173 * will remove any crtc links of unused encoders and encoder links of 174 * disconnected connectors. Then it will disable all unused encoders and crtcs 175 * either by calling their disable callback if available or by calling their 176 * dpms callback with DRM_MODE_DPMS_OFF. 177 */ 178 void drm_helper_disable_unused_functions(struct drm_device *dev) 179 { 180 drm_modeset_lock_all(dev); 181 __drm_helper_disable_unused_functions(dev); 182 drm_modeset_unlock_all(dev); 183 } 184 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 185 186 /* 187 * Check the CRTC we're going to map each output to vs. its current 188 * CRTC. If they don't match, we have to disable the output and the CRTC 189 * since the driver will have to re-route things. 190 */ 191 static void 192 drm_crtc_prepare_encoders(struct drm_device *dev) 193 { 194 struct drm_encoder_helper_funcs *encoder_funcs; 195 struct drm_encoder *encoder; 196 197 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 198 encoder_funcs = encoder->helper_private; 199 /* Disable unused encoders */ 200 if (encoder->crtc == NULL) 201 drm_encoder_disable(encoder); 202 /* Disable encoders whose CRTC is about to change */ 203 if (encoder_funcs->get_crtc && 204 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 205 drm_encoder_disable(encoder); 206 } 207 } 208 209 /** 210 * drm_crtc_helper_set_mode - internal helper to set a mode 211 * @crtc: CRTC to program 212 * @mode: mode to use 213 * @x: horizontal offset into the surface 214 * @y: vertical offset into the surface 215 * @old_fb: old framebuffer, for cleanup 216 * 217 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 218 * to fixup or reject the mode prior to trying to set it. This is an internal 219 * helper that drivers could e.g. use to update properties that require the 220 * entire output pipe to be disabled and re-enabled in a new configuration. For 221 * example for changing whether audio is enabled on a hdmi link or for changing 222 * panel fitter or dither attributes. It is also called by the 223 * drm_crtc_helper_set_config() helper function to drive the mode setting 224 * sequence. 225 * 226 * Returns: 227 * True if the mode was set successfully, false otherwise. 228 */ 229 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 230 struct drm_display_mode *mode, 231 int x, int y, 232 struct drm_framebuffer *old_fb) 233 { 234 struct drm_device *dev = crtc->dev; 235 struct drm_display_mode *adjusted_mode, saved_mode; 236 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 237 struct drm_encoder_helper_funcs *encoder_funcs; 238 int saved_x, saved_y; 239 bool saved_enabled; 240 struct drm_encoder *encoder; 241 bool ret = true; 242 243 drm_warn_on_modeset_not_all_locked(dev); 244 245 saved_enabled = crtc->enabled; 246 crtc->enabled = drm_helper_crtc_in_use(crtc); 247 if (!crtc->enabled) 248 return true; 249 250 adjusted_mode = drm_mode_duplicate(dev, mode); 251 if (!adjusted_mode) { 252 crtc->enabled = saved_enabled; 253 return false; 254 } 255 256 saved_mode = crtc->mode; 257 saved_x = crtc->x; 258 saved_y = crtc->y; 259 260 /* Update crtc values up front so the driver can rely on them for mode 261 * setting. 262 */ 263 crtc->mode = *mode; 264 crtc->x = x; 265 crtc->y = y; 266 267 /* Pass our mode to the connectors and the CRTC to give them a chance to 268 * adjust it according to limitations or connector properties, and also 269 * a chance to reject the mode entirely. 270 */ 271 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 272 273 if (encoder->crtc != crtc) 274 continue; 275 276 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) { 277 ret = encoder->bridge->funcs->mode_fixup( 278 encoder->bridge, mode, adjusted_mode); 279 if (!ret) { 280 DRM_DEBUG_KMS("Bridge fixup failed\n"); 281 goto done; 282 } 283 } 284 285 encoder_funcs = encoder->helper_private; 286 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 287 adjusted_mode))) { 288 DRM_DEBUG_KMS("Encoder fixup failed\n"); 289 goto done; 290 } 291 } 292 293 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) { 294 DRM_DEBUG_KMS("CRTC fixup failed\n"); 295 goto done; 296 } 297 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id); 298 299 /* Prepare the encoders and CRTCs before setting the mode. */ 300 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 301 302 if (encoder->crtc != crtc) 303 continue; 304 305 if (encoder->bridge) 306 encoder->bridge->funcs->disable(encoder->bridge); 307 308 encoder_funcs = encoder->helper_private; 309 /* Disable the encoders as the first thing we do. */ 310 encoder_funcs->prepare(encoder); 311 312 if (encoder->bridge) 313 encoder->bridge->funcs->post_disable(encoder->bridge); 314 } 315 316 drm_crtc_prepare_encoders(dev); 317 318 crtc_funcs->prepare(crtc); 319 320 /* Set up the DPLL and any encoders state that needs to adjust or depend 321 * on the DPLL. 322 */ 323 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 324 if (!ret) 325 goto done; 326 327 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 328 329 if (encoder->crtc != crtc) 330 continue; 331 332 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 333 encoder->base.id, encoder->name, 334 mode->base.id, mode->name); 335 encoder_funcs = encoder->helper_private; 336 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 337 338 if (encoder->bridge && encoder->bridge->funcs->mode_set) 339 encoder->bridge->funcs->mode_set(encoder->bridge, mode, 340 adjusted_mode); 341 } 342 343 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 344 crtc_funcs->commit(crtc); 345 346 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 347 348 if (encoder->crtc != crtc) 349 continue; 350 351 if (encoder->bridge) 352 encoder->bridge->funcs->pre_enable(encoder->bridge); 353 354 encoder_funcs = encoder->helper_private; 355 encoder_funcs->commit(encoder); 356 357 if (encoder->bridge) 358 encoder->bridge->funcs->enable(encoder->bridge); 359 } 360 361 /* Store real post-adjustment hardware mode. */ 362 crtc->hwmode = *adjusted_mode; 363 364 /* Calculate and store various constants which 365 * are later needed by vblank and swap-completion 366 * timestamping. They are derived from true hwmode. 367 */ 368 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 369 370 /* FIXME: add subpixel order */ 371 done: 372 drm_mode_destroy(dev, adjusted_mode); 373 if (!ret) { 374 crtc->enabled = saved_enabled; 375 crtc->mode = saved_mode; 376 crtc->x = saved_x; 377 crtc->y = saved_y; 378 } 379 380 return ret; 381 } 382 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 383 384 static void 385 drm_crtc_helper_disable(struct drm_crtc *crtc) 386 { 387 struct drm_device *dev = crtc->dev; 388 struct drm_connector *connector; 389 struct drm_encoder *encoder; 390 391 /* Decouple all encoders and their attached connectors from this crtc */ 392 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 393 if (encoder->crtc != crtc) 394 continue; 395 396 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 397 if (connector->encoder != encoder) 398 continue; 399 400 connector->encoder = NULL; 401 402 /* 403 * drm_helper_disable_unused_functions() ought to be 404 * doing this, but since we've decoupled the encoder 405 * from the connector above, the required connection 406 * between them is henceforth no longer available. 407 */ 408 connector->dpms = DRM_MODE_DPMS_OFF; 409 } 410 } 411 412 __drm_helper_disable_unused_functions(dev); 413 } 414 415 /** 416 * drm_crtc_helper_set_config - set a new config from userspace 417 * @set: mode set configuration 418 * 419 * Setup a new configuration, provided by the upper layers (either an ioctl call 420 * from userspace or internally e.g. from the fbdev support code) in @set, and 421 * enable it. This is the main helper functions for drivers that implement 422 * kernel mode setting with the crtc helper functions and the assorted 423 * ->prepare(), ->modeset() and ->commit() helper callbacks. 424 * 425 * Returns: 426 * Returns 0 on success, negative errno numbers on failure. 427 */ 428 int drm_crtc_helper_set_config(struct drm_mode_set *set) 429 { 430 struct drm_device *dev; 431 struct drm_crtc *new_crtc; 432 struct drm_encoder *save_encoders, *new_encoder, *encoder; 433 bool mode_changed = false; /* if true do a full mode set */ 434 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 435 struct drm_connector *save_connectors, *connector; 436 int count = 0, ro, fail = 0; 437 struct drm_crtc_helper_funcs *crtc_funcs; 438 struct drm_mode_set save_set; 439 int ret; 440 int i; 441 442 DRM_DEBUG_KMS("\n"); 443 444 BUG_ON(!set); 445 BUG_ON(!set->crtc); 446 BUG_ON(!set->crtc->helper_private); 447 448 /* Enforce sane interface api - has been abused by the fb helper. */ 449 BUG_ON(!set->mode && set->fb); 450 BUG_ON(set->fb && set->num_connectors == 0); 451 452 crtc_funcs = set->crtc->helper_private; 453 454 if (!set->mode) 455 set->fb = NULL; 456 457 if (set->fb) { 458 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n", 459 set->crtc->base.id, set->fb->base.id, 460 (int)set->num_connectors, set->x, set->y); 461 } else { 462 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id); 463 drm_crtc_helper_disable(set->crtc); 464 return 0; 465 } 466 467 dev = set->crtc->dev; 468 469 drm_warn_on_modeset_not_all_locked(dev); 470 471 /* 472 * Allocate space for the backup of all (non-pointer) encoder and 473 * connector data. 474 */ 475 save_encoders = kzalloc(dev->mode_config.num_encoder * 476 sizeof(struct drm_encoder), GFP_KERNEL); 477 if (!save_encoders) 478 return -ENOMEM; 479 480 save_connectors = kzalloc(dev->mode_config.num_connector * 481 sizeof(struct drm_connector), GFP_KERNEL); 482 if (!save_connectors) { 483 kfree(save_encoders); 484 return -ENOMEM; 485 } 486 487 /* 488 * Copy data. Note that driver private data is not affected. 489 * Should anything bad happen only the expected state is 490 * restored, not the drivers personal bookkeeping. 491 */ 492 count = 0; 493 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 494 save_encoders[count++] = *encoder; 495 } 496 497 count = 0; 498 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 499 save_connectors[count++] = *connector; 500 } 501 502 save_set.crtc = set->crtc; 503 save_set.mode = &set->crtc->mode; 504 save_set.x = set->crtc->x; 505 save_set.y = set->crtc->y; 506 save_set.fb = set->crtc->primary->fb; 507 508 /* We should be able to check here if the fb has the same properties 509 * and then just flip_or_move it */ 510 if (set->crtc->primary->fb != set->fb) { 511 /* If we have no fb then treat it as a full mode set */ 512 if (set->crtc->primary->fb == NULL) { 513 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 514 mode_changed = true; 515 } else if (set->fb == NULL) { 516 mode_changed = true; 517 } else if (set->fb->pixel_format != 518 set->crtc->primary->fb->pixel_format) { 519 mode_changed = true; 520 } else 521 fb_changed = true; 522 } 523 524 if (set->x != set->crtc->x || set->y != set->crtc->y) 525 fb_changed = true; 526 527 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) { 528 DRM_DEBUG_KMS("modes are different, full mode set\n"); 529 drm_mode_debug_printmodeline(&set->crtc->mode); 530 drm_mode_debug_printmodeline(set->mode); 531 mode_changed = true; 532 } 533 534 /* a) traverse passed in connector list and get encoders for them */ 535 count = 0; 536 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 537 struct drm_connector_helper_funcs *connector_funcs = 538 connector->helper_private; 539 new_encoder = connector->encoder; 540 for (ro = 0; ro < set->num_connectors; ro++) { 541 if (set->connectors[ro] == connector) { 542 new_encoder = connector_funcs->best_encoder(connector); 543 /* if we can't get an encoder for a connector 544 we are setting now - then fail */ 545 if (new_encoder == NULL) 546 /* don't break so fail path works correct */ 547 fail = 1; 548 549 if (connector->dpms != DRM_MODE_DPMS_ON) { 550 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 551 mode_changed = true; 552 } 553 554 break; 555 } 556 } 557 558 if (new_encoder != connector->encoder) { 559 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 560 mode_changed = true; 561 /* If the encoder is reused for another connector, then 562 * the appropriate crtc will be set later. 563 */ 564 if (connector->encoder) 565 connector->encoder->crtc = NULL; 566 connector->encoder = new_encoder; 567 } 568 } 569 570 if (fail) { 571 ret = -EINVAL; 572 goto fail; 573 } 574 575 count = 0; 576 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 577 if (!connector->encoder) 578 continue; 579 580 if (connector->encoder->crtc == set->crtc) 581 new_crtc = NULL; 582 else 583 new_crtc = connector->encoder->crtc; 584 585 for (ro = 0; ro < set->num_connectors; ro++) { 586 if (set->connectors[ro] == connector) 587 new_crtc = set->crtc; 588 } 589 590 /* Make sure the new CRTC will work with the encoder */ 591 if (new_crtc && 592 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 593 ret = -EINVAL; 594 goto fail; 595 } 596 if (new_crtc != connector->encoder->crtc) { 597 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 598 mode_changed = true; 599 connector->encoder->crtc = new_crtc; 600 } 601 if (new_crtc) { 602 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n", 603 connector->base.id, connector->name, 604 new_crtc->base.id); 605 } else { 606 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 607 connector->base.id, connector->name); 608 } 609 } 610 611 /* mode_set_base is not a required function */ 612 if (fb_changed && !crtc_funcs->mode_set_base) 613 mode_changed = true; 614 615 if (mode_changed) { 616 if (drm_helper_crtc_in_use(set->crtc)) { 617 DRM_DEBUG_KMS("attempting to set mode from" 618 " userspace\n"); 619 drm_mode_debug_printmodeline(set->mode); 620 set->crtc->primary->fb = set->fb; 621 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 622 set->x, set->y, 623 save_set.fb)) { 624 DRM_ERROR("failed to set mode on [CRTC:%d]\n", 625 set->crtc->base.id); 626 set->crtc->primary->fb = save_set.fb; 627 ret = -EINVAL; 628 goto fail; 629 } 630 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 631 for (i = 0; i < set->num_connectors; i++) { 632 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 633 set->connectors[i]->name); 634 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 635 } 636 } 637 __drm_helper_disable_unused_functions(dev); 638 } else if (fb_changed) { 639 set->crtc->x = set->x; 640 set->crtc->y = set->y; 641 set->crtc->primary->fb = set->fb; 642 ret = crtc_funcs->mode_set_base(set->crtc, 643 set->x, set->y, save_set.fb); 644 if (ret != 0) { 645 set->crtc->x = save_set.x; 646 set->crtc->y = save_set.y; 647 set->crtc->primary->fb = save_set.fb; 648 goto fail; 649 } 650 } 651 652 kfree(save_connectors); 653 kfree(save_encoders); 654 return 0; 655 656 fail: 657 /* Restore all previous data. */ 658 count = 0; 659 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 660 *encoder = save_encoders[count++]; 661 } 662 663 count = 0; 664 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 665 *connector = save_connectors[count++]; 666 } 667 668 /* Try to restore the config */ 669 if (mode_changed && 670 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 671 save_set.y, save_set.fb)) 672 DRM_ERROR("failed to restore config after modeset failure\n"); 673 674 kfree(save_connectors); 675 kfree(save_encoders); 676 return ret; 677 } 678 EXPORT_SYMBOL(drm_crtc_helper_set_config); 679 680 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 681 { 682 int dpms = DRM_MODE_DPMS_OFF; 683 struct drm_connector *connector; 684 struct drm_device *dev = encoder->dev; 685 686 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 687 if (connector->encoder == encoder) 688 if (connector->dpms < dpms) 689 dpms = connector->dpms; 690 return dpms; 691 } 692 693 /* Helper which handles bridge ordering around encoder dpms */ 694 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 695 { 696 struct drm_bridge *bridge = encoder->bridge; 697 struct drm_encoder_helper_funcs *encoder_funcs; 698 699 if (bridge) { 700 if (mode == DRM_MODE_DPMS_ON) 701 bridge->funcs->pre_enable(bridge); 702 else 703 bridge->funcs->disable(bridge); 704 } 705 706 encoder_funcs = encoder->helper_private; 707 if (encoder_funcs->dpms) 708 encoder_funcs->dpms(encoder, mode); 709 710 if (bridge) { 711 if (mode == DRM_MODE_DPMS_ON) 712 bridge->funcs->enable(bridge); 713 else 714 bridge->funcs->post_disable(bridge); 715 } 716 } 717 718 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 719 { 720 int dpms = DRM_MODE_DPMS_OFF; 721 struct drm_connector *connector; 722 struct drm_device *dev = crtc->dev; 723 724 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 725 if (connector->encoder && connector->encoder->crtc == crtc) 726 if (connector->dpms < dpms) 727 dpms = connector->dpms; 728 return dpms; 729 } 730 731 /** 732 * drm_helper_connector_dpms() - connector dpms helper implementation 733 * @connector: affected connector 734 * @mode: DPMS mode 735 * 736 * This is the main helper function provided by the crtc helper framework for 737 * implementing the DPMS connector attribute. It computes the new desired DPMS 738 * state for all encoders and crtcs in the output mesh and calls the ->dpms() 739 * callback provided by the driver appropriately. 740 */ 741 void drm_helper_connector_dpms(struct drm_connector *connector, int mode) 742 { 743 struct drm_encoder *encoder = connector->encoder; 744 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 745 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 746 747 if (mode == connector->dpms) 748 return; 749 750 old_dpms = connector->dpms; 751 connector->dpms = mode; 752 753 if (encoder) 754 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 755 756 /* from off to on, do crtc then encoder */ 757 if (mode < old_dpms) { 758 if (crtc) { 759 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 760 if (crtc_funcs->dpms) 761 (*crtc_funcs->dpms) (crtc, 762 drm_helper_choose_crtc_dpms(crtc)); 763 } 764 if (encoder) 765 drm_helper_encoder_dpms(encoder, encoder_dpms); 766 } 767 768 /* from on to off, do encoder then crtc */ 769 if (mode > old_dpms) { 770 if (encoder) 771 drm_helper_encoder_dpms(encoder, encoder_dpms); 772 if (crtc) { 773 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 774 if (crtc_funcs->dpms) 775 (*crtc_funcs->dpms) (crtc, 776 drm_helper_choose_crtc_dpms(crtc)); 777 } 778 } 779 780 return; 781 } 782 EXPORT_SYMBOL(drm_helper_connector_dpms); 783 784 /** 785 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata 786 * @fb: drm_framebuffer object to fill out 787 * @mode_cmd: metadata from the userspace fb creation request 788 * 789 * This helper can be used in a drivers fb_create callback to pre-fill the fb's 790 * metadata fields. 791 */ 792 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 793 struct drm_mode_fb_cmd2 *mode_cmd) 794 { 795 int i; 796 797 fb->width = mode_cmd->width; 798 fb->height = mode_cmd->height; 799 for (i = 0; i < 4; i++) { 800 fb->pitches[i] = mode_cmd->pitches[i]; 801 fb->offsets[i] = mode_cmd->offsets[i]; 802 } 803 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, 804 &fb->bits_per_pixel); 805 fb->pixel_format = mode_cmd->pixel_format; 806 } 807 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 808 809 /** 810 * drm_helper_resume_force_mode - force-restore mode setting configuration 811 * @dev: drm_device which should be restored 812 * 813 * Drivers which use the mode setting helpers can use this function to 814 * force-restore the mode setting configuration e.g. on resume or when something 815 * else might have trampled over the hw state (like some overzealous old BIOSen 816 * tended to do). 817 * 818 * This helper doesn't provide a error return value since restoring the old 819 * config should never fail due to resource allocation issues since the driver 820 * has successfully set the restored configuration already. Hence this should 821 * boil down to the equivalent of a few dpms on calls, which also don't provide 822 * an error code. 823 * 824 * Drivers where simply restoring an old configuration again might fail (e.g. 825 * due to slight differences in allocating shared resources when the 826 * configuration is restored in a different order than when userspace set it up) 827 * need to use their own restore logic. 828 */ 829 void drm_helper_resume_force_mode(struct drm_device *dev) 830 { 831 struct drm_crtc *crtc; 832 struct drm_encoder *encoder; 833 struct drm_crtc_helper_funcs *crtc_funcs; 834 int encoder_dpms; 835 bool ret; 836 837 drm_modeset_lock_all(dev); 838 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 839 840 if (!crtc->enabled) 841 continue; 842 843 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 844 crtc->x, crtc->y, crtc->primary->fb); 845 846 /* Restoring the old config should never fail! */ 847 if (ret == false) 848 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 849 850 /* Turn off outputs that were already powered off */ 851 if (drm_helper_choose_crtc_dpms(crtc)) { 852 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 853 854 if(encoder->crtc != crtc) 855 continue; 856 857 encoder_dpms = drm_helper_choose_encoder_dpms( 858 encoder); 859 860 drm_helper_encoder_dpms(encoder, encoder_dpms); 861 } 862 863 crtc_funcs = crtc->helper_private; 864 if (crtc_funcs->dpms) 865 (*crtc_funcs->dpms) (crtc, 866 drm_helper_choose_crtc_dpms(crtc)); 867 } 868 } 869 870 /* disable the unused connectors while restoring the modesetting */ 871 __drm_helper_disable_unused_functions(dev); 872 drm_modeset_unlock_all(dev); 873 } 874 EXPORT_SYMBOL(drm_helper_resume_force_mode); 875