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