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_atomic.h> 37 #include <drm/drm_crtc.h> 38 #include <drm/drm_crtc_helper.h> 39 #include <drm/drm_fb_helper.h> 40 #include <drm/drm_plane_helper.h> 41 #include <drm/drm_atomic_helper.h> 42 #include <drm/drm_edid.h> 43 44 /** 45 * DOC: overview 46 * 47 * The CRTC modeset helper library provides a default set_config implementation 48 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 49 * the same callbacks which drivers can use to e.g. restore the modeset 50 * configuration on resume with drm_helper_resume_force_mode(). 51 * 52 * The driver callbacks are mostly compatible with the atomic modeset helpers, 53 * except for the handling of the primary plane: Atomic helpers require that the 54 * primary plane is implemented as a real standalone plane and not directly tied 55 * to the CRTC state. For easier transition this library provides functions to 56 * implement the old semantics required by the CRTC helpers using the new plane 57 * and atomic helper callbacks. 58 * 59 * Drivers are strongly urged to convert to the atomic helpers (by way of first 60 * converting to the plane helpers). New drivers must not use these functions 61 * but need to implement the atomic interface instead, potentially using the 62 * atomic helpers for that. 63 */ 64 MODULE_AUTHOR("David Airlie, Jesse Barnes"); 65 MODULE_DESCRIPTION("DRM KMS helper"); 66 67 /** 68 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the 69 * connector list 70 * @dev: drm device to operate on 71 * 72 * Some userspace presumes that the first connected connector is the main 73 * display, where it's supposed to display e.g. the login screen. For 74 * laptops, this should be the main panel. Use this function to sort all 75 * (eDP/LVDS) panels to the front of the connector list, instead of 76 * painstakingly trying to initialize them in the right order. 77 */ 78 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) 79 { 80 struct drm_connector *connector, *tmp; 81 struct list_head panel_list; 82 83 INIT_LIST_HEAD(&panel_list); 84 85 list_for_each_entry_safe(connector, tmp, 86 &dev->mode_config.connector_list, head) { 87 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS || 88 connector->connector_type == DRM_MODE_CONNECTOR_eDP) 89 list_move_tail(&connector->head, &panel_list); 90 } 91 92 list_splice(&panel_list, &dev->mode_config.connector_list); 93 } 94 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 95 96 /** 97 * drm_helper_encoder_in_use - check if a given encoder is in use 98 * @encoder: encoder to check 99 * 100 * Checks whether @encoder is with the current mode setting output configuration 101 * in use by any connector. This doesn't mean that it is actually enabled since 102 * the DPMS state is tracked separately. 103 * 104 * Returns: 105 * True if @encoder is used, false otherwise. 106 */ 107 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 108 { 109 struct drm_connector *connector; 110 struct drm_device *dev = encoder->dev; 111 112 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 113 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 114 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 115 if (connector->encoder == encoder) 116 return true; 117 return false; 118 } 119 EXPORT_SYMBOL(drm_helper_encoder_in_use); 120 121 /** 122 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 123 * @crtc: CRTC to check 124 * 125 * Checks whether @crtc is with the current mode setting output configuration 126 * in use by any connector. This doesn't mean that it is actually enabled since 127 * the DPMS state is tracked separately. 128 * 129 * Returns: 130 * True if @crtc is used, false otherwise. 131 */ 132 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 133 { 134 struct drm_encoder *encoder; 135 struct drm_device *dev = crtc->dev; 136 137 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 138 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 139 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 140 return true; 141 return false; 142 } 143 EXPORT_SYMBOL(drm_helper_crtc_in_use); 144 145 static void 146 drm_encoder_disable(struct drm_encoder *encoder) 147 { 148 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 149 150 drm_bridge_disable(encoder->bridge); 151 152 if (encoder_funcs->disable) 153 (*encoder_funcs->disable)(encoder); 154 else 155 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 156 157 drm_bridge_post_disable(encoder->bridge); 158 } 159 160 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 161 { 162 struct drm_encoder *encoder; 163 struct drm_crtc *crtc; 164 165 drm_warn_on_modeset_not_all_locked(dev); 166 167 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 168 if (!drm_helper_encoder_in_use(encoder)) { 169 drm_encoder_disable(encoder); 170 /* disconnect encoder from any connector */ 171 encoder->crtc = NULL; 172 } 173 } 174 175 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 176 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 177 crtc->enabled = drm_helper_crtc_in_use(crtc); 178 if (!crtc->enabled) { 179 if (crtc_funcs->disable) 180 (*crtc_funcs->disable)(crtc); 181 else 182 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 183 crtc->primary->fb = NULL; 184 } 185 } 186 } 187 188 /** 189 * drm_helper_disable_unused_functions - disable unused objects 190 * @dev: DRM device 191 * 192 * This function walks through the entire mode setting configuration of @dev. It 193 * will remove any crtc links of unused encoders and encoder links of 194 * disconnected connectors. Then it will disable all unused encoders and crtcs 195 * either by calling their disable callback if available or by calling their 196 * dpms callback with DRM_MODE_DPMS_OFF. 197 */ 198 void drm_helper_disable_unused_functions(struct drm_device *dev) 199 { 200 drm_modeset_lock_all(dev); 201 __drm_helper_disable_unused_functions(dev); 202 drm_modeset_unlock_all(dev); 203 } 204 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 205 206 /* 207 * Check the CRTC we're going to map each output to vs. its current 208 * CRTC. If they don't match, we have to disable the output and the CRTC 209 * since the driver will have to re-route things. 210 */ 211 static void 212 drm_crtc_prepare_encoders(struct drm_device *dev) 213 { 214 const struct drm_encoder_helper_funcs *encoder_funcs; 215 struct drm_encoder *encoder; 216 217 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 218 encoder_funcs = encoder->helper_private; 219 /* Disable unused encoders */ 220 if (encoder->crtc == NULL) 221 drm_encoder_disable(encoder); 222 /* Disable encoders whose CRTC is about to change */ 223 if (encoder_funcs->get_crtc && 224 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 225 drm_encoder_disable(encoder); 226 } 227 } 228 229 /** 230 * drm_crtc_helper_set_mode - internal helper to set a mode 231 * @crtc: CRTC to program 232 * @mode: mode to use 233 * @x: horizontal offset into the surface 234 * @y: vertical offset into the surface 235 * @old_fb: old framebuffer, for cleanup 236 * 237 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 238 * to fixup or reject the mode prior to trying to set it. This is an internal 239 * helper that drivers could e.g. use to update properties that require the 240 * entire output pipe to be disabled and re-enabled in a new configuration. For 241 * example for changing whether audio is enabled on a hdmi link or for changing 242 * panel fitter or dither attributes. It is also called by the 243 * drm_crtc_helper_set_config() helper function to drive the mode setting 244 * sequence. 245 * 246 * Returns: 247 * True if the mode was set successfully, false otherwise. 248 */ 249 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 250 struct drm_display_mode *mode, 251 int x, int y, 252 struct drm_framebuffer *old_fb) 253 { 254 struct drm_device *dev = crtc->dev; 255 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 256 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 257 const struct drm_encoder_helper_funcs *encoder_funcs; 258 int saved_x, saved_y; 259 bool saved_enabled; 260 struct drm_encoder *encoder; 261 bool ret = true; 262 263 drm_warn_on_modeset_not_all_locked(dev); 264 265 saved_enabled = crtc->enabled; 266 crtc->enabled = drm_helper_crtc_in_use(crtc); 267 if (!crtc->enabled) 268 return true; 269 270 adjusted_mode = drm_mode_duplicate(dev, mode); 271 if (!adjusted_mode) { 272 crtc->enabled = saved_enabled; 273 return false; 274 } 275 276 saved_mode = crtc->mode; 277 saved_hwmode = crtc->hwmode; 278 saved_x = crtc->x; 279 saved_y = crtc->y; 280 281 /* Update crtc values up front so the driver can rely on them for mode 282 * setting. 283 */ 284 crtc->mode = *mode; 285 crtc->x = x; 286 crtc->y = y; 287 288 /* Pass our mode to the connectors and the CRTC to give them a chance to 289 * adjust it according to limitations or connector properties, and also 290 * a chance to reject the mode entirely. 291 */ 292 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 293 294 if (encoder->crtc != crtc) 295 continue; 296 297 ret = drm_bridge_mode_fixup(encoder->bridge, 298 mode, adjusted_mode); 299 if (!ret) { 300 DRM_DEBUG_KMS("Bridge fixup failed\n"); 301 goto done; 302 } 303 304 encoder_funcs = encoder->helper_private; 305 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 306 adjusted_mode))) { 307 DRM_DEBUG_KMS("Encoder fixup failed\n"); 308 goto done; 309 } 310 } 311 312 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) { 313 DRM_DEBUG_KMS("CRTC fixup failed\n"); 314 goto done; 315 } 316 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id); 317 318 crtc->hwmode = *adjusted_mode; 319 320 /* Prepare the encoders and CRTCs before setting the mode. */ 321 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 322 323 if (encoder->crtc != crtc) 324 continue; 325 326 drm_bridge_disable(encoder->bridge); 327 328 encoder_funcs = encoder->helper_private; 329 /* Disable the encoders as the first thing we do. */ 330 encoder_funcs->prepare(encoder); 331 332 drm_bridge_post_disable(encoder->bridge); 333 } 334 335 drm_crtc_prepare_encoders(dev); 336 337 crtc_funcs->prepare(crtc); 338 339 /* Set up the DPLL and any encoders state that needs to adjust or depend 340 * on the DPLL. 341 */ 342 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 343 if (!ret) 344 goto done; 345 346 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 347 348 if (encoder->crtc != crtc) 349 continue; 350 351 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 352 encoder->base.id, encoder->name, 353 mode->base.id, mode->name); 354 encoder_funcs = encoder->helper_private; 355 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 356 357 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode); 358 } 359 360 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 361 crtc_funcs->commit(crtc); 362 363 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 364 365 if (encoder->crtc != crtc) 366 continue; 367 368 drm_bridge_pre_enable(encoder->bridge); 369 370 encoder_funcs = encoder->helper_private; 371 encoder_funcs->commit(encoder); 372 373 drm_bridge_enable(encoder->bridge); 374 } 375 376 /* Calculate and store various constants which 377 * are later needed by vblank and swap-completion 378 * timestamping. They are derived from true hwmode. 379 */ 380 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 381 382 /* FIXME: add subpixel order */ 383 done: 384 drm_mode_destroy(dev, adjusted_mode); 385 if (!ret) { 386 crtc->enabled = saved_enabled; 387 crtc->mode = saved_mode; 388 crtc->hwmode = saved_hwmode; 389 crtc->x = saved_x; 390 crtc->y = saved_y; 391 } 392 393 return ret; 394 } 395 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 396 397 static void 398 drm_crtc_helper_disable(struct drm_crtc *crtc) 399 { 400 struct drm_device *dev = crtc->dev; 401 struct drm_connector *connector; 402 struct drm_encoder *encoder; 403 404 /* Decouple all encoders and their attached connectors from this crtc */ 405 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 406 if (encoder->crtc != crtc) 407 continue; 408 409 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 410 if (connector->encoder != encoder) 411 continue; 412 413 connector->encoder = NULL; 414 415 /* 416 * drm_helper_disable_unused_functions() ought to be 417 * doing this, but since we've decoupled the encoder 418 * from the connector above, the required connection 419 * between them is henceforth no longer available. 420 */ 421 connector->dpms = DRM_MODE_DPMS_OFF; 422 } 423 } 424 425 __drm_helper_disable_unused_functions(dev); 426 } 427 428 /** 429 * drm_crtc_helper_set_config - set a new config from userspace 430 * @set: mode set configuration 431 * 432 * Setup a new configuration, provided by the upper layers (either an ioctl call 433 * from userspace or internally e.g. from the fbdev support code) in @set, and 434 * enable it. This is the main helper functions for drivers that implement 435 * kernel mode setting with the crtc helper functions and the assorted 436 * ->prepare(), ->modeset() and ->commit() helper callbacks. 437 * 438 * Returns: 439 * Returns 0 on success, negative errno numbers on failure. 440 */ 441 int drm_crtc_helper_set_config(struct drm_mode_set *set) 442 { 443 struct drm_device *dev; 444 struct drm_crtc *new_crtc; 445 struct drm_encoder *save_encoders, *new_encoder, *encoder; 446 bool mode_changed = false; /* if true do a full mode set */ 447 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 448 struct drm_connector *save_connectors, *connector; 449 int count = 0, ro, fail = 0; 450 const struct drm_crtc_helper_funcs *crtc_funcs; 451 struct drm_mode_set save_set; 452 int ret; 453 int i; 454 455 DRM_DEBUG_KMS("\n"); 456 457 BUG_ON(!set); 458 BUG_ON(!set->crtc); 459 BUG_ON(!set->crtc->helper_private); 460 461 /* Enforce sane interface api - has been abused by the fb helper. */ 462 BUG_ON(!set->mode && set->fb); 463 BUG_ON(set->fb && set->num_connectors == 0); 464 465 crtc_funcs = set->crtc->helper_private; 466 467 if (!set->mode) 468 set->fb = NULL; 469 470 if (set->fb) { 471 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n", 472 set->crtc->base.id, set->fb->base.id, 473 (int)set->num_connectors, set->x, set->y); 474 } else { 475 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id); 476 drm_crtc_helper_disable(set->crtc); 477 return 0; 478 } 479 480 dev = set->crtc->dev; 481 482 drm_warn_on_modeset_not_all_locked(dev); 483 484 /* 485 * Allocate space for the backup of all (non-pointer) encoder and 486 * connector data. 487 */ 488 save_encoders = kzalloc(dev->mode_config.num_encoder * 489 sizeof(struct drm_encoder), GFP_KERNEL); 490 if (!save_encoders) 491 return -ENOMEM; 492 493 save_connectors = kzalloc(dev->mode_config.num_connector * 494 sizeof(struct drm_connector), GFP_KERNEL); 495 if (!save_connectors) { 496 kfree(save_encoders); 497 return -ENOMEM; 498 } 499 500 /* 501 * Copy data. Note that driver private data is not affected. 502 * Should anything bad happen only the expected state is 503 * restored, not the drivers personal bookkeeping. 504 */ 505 count = 0; 506 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 507 save_encoders[count++] = *encoder; 508 } 509 510 count = 0; 511 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 512 save_connectors[count++] = *connector; 513 } 514 515 save_set.crtc = set->crtc; 516 save_set.mode = &set->crtc->mode; 517 save_set.x = set->crtc->x; 518 save_set.y = set->crtc->y; 519 save_set.fb = set->crtc->primary->fb; 520 521 /* We should be able to check here if the fb has the same properties 522 * and then just flip_or_move it */ 523 if (set->crtc->primary->fb != set->fb) { 524 /* If we have no fb then treat it as a full mode set */ 525 if (set->crtc->primary->fb == NULL) { 526 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 527 mode_changed = true; 528 } else if (set->fb == NULL) { 529 mode_changed = true; 530 } else if (set->fb->pixel_format != 531 set->crtc->primary->fb->pixel_format) { 532 mode_changed = true; 533 } else 534 fb_changed = true; 535 } 536 537 if (set->x != set->crtc->x || set->y != set->crtc->y) 538 fb_changed = true; 539 540 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) { 541 DRM_DEBUG_KMS("modes are different, full mode set\n"); 542 drm_mode_debug_printmodeline(&set->crtc->mode); 543 drm_mode_debug_printmodeline(set->mode); 544 mode_changed = true; 545 } 546 547 /* a) traverse passed in connector list and get encoders for them */ 548 count = 0; 549 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 550 const struct drm_connector_helper_funcs *connector_funcs = 551 connector->helper_private; 552 new_encoder = connector->encoder; 553 for (ro = 0; ro < set->num_connectors; ro++) { 554 if (set->connectors[ro] == connector) { 555 new_encoder = connector_funcs->best_encoder(connector); 556 /* if we can't get an encoder for a connector 557 we are setting now - then fail */ 558 if (new_encoder == NULL) 559 /* don't break so fail path works correct */ 560 fail = 1; 561 562 if (connector->dpms != DRM_MODE_DPMS_ON) { 563 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 564 mode_changed = true; 565 } 566 567 break; 568 } 569 } 570 571 if (new_encoder != connector->encoder) { 572 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 573 mode_changed = true; 574 /* If the encoder is reused for another connector, then 575 * the appropriate crtc will be set later. 576 */ 577 if (connector->encoder) 578 connector->encoder->crtc = NULL; 579 connector->encoder = new_encoder; 580 } 581 } 582 583 if (fail) { 584 ret = -EINVAL; 585 goto fail; 586 } 587 588 count = 0; 589 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 590 if (!connector->encoder) 591 continue; 592 593 if (connector->encoder->crtc == set->crtc) 594 new_crtc = NULL; 595 else 596 new_crtc = connector->encoder->crtc; 597 598 for (ro = 0; ro < set->num_connectors; ro++) { 599 if (set->connectors[ro] == connector) 600 new_crtc = set->crtc; 601 } 602 603 /* Make sure the new CRTC will work with the encoder */ 604 if (new_crtc && 605 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 606 ret = -EINVAL; 607 goto fail; 608 } 609 if (new_crtc != connector->encoder->crtc) { 610 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 611 mode_changed = true; 612 connector->encoder->crtc = new_crtc; 613 } 614 if (new_crtc) { 615 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n", 616 connector->base.id, connector->name, 617 new_crtc->base.id); 618 } else { 619 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 620 connector->base.id, connector->name); 621 } 622 } 623 624 /* mode_set_base is not a required function */ 625 if (fb_changed && !crtc_funcs->mode_set_base) 626 mode_changed = true; 627 628 if (mode_changed) { 629 if (drm_helper_crtc_in_use(set->crtc)) { 630 DRM_DEBUG_KMS("attempting to set mode from" 631 " userspace\n"); 632 drm_mode_debug_printmodeline(set->mode); 633 set->crtc->primary->fb = set->fb; 634 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 635 set->x, set->y, 636 save_set.fb)) { 637 DRM_ERROR("failed to set mode on [CRTC:%d]\n", 638 set->crtc->base.id); 639 set->crtc->primary->fb = save_set.fb; 640 ret = -EINVAL; 641 goto fail; 642 } 643 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 644 for (i = 0; i < set->num_connectors; i++) { 645 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 646 set->connectors[i]->name); 647 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 648 } 649 } 650 __drm_helper_disable_unused_functions(dev); 651 } else if (fb_changed) { 652 set->crtc->x = set->x; 653 set->crtc->y = set->y; 654 set->crtc->primary->fb = set->fb; 655 ret = crtc_funcs->mode_set_base(set->crtc, 656 set->x, set->y, save_set.fb); 657 if (ret != 0) { 658 set->crtc->x = save_set.x; 659 set->crtc->y = save_set.y; 660 set->crtc->primary->fb = save_set.fb; 661 goto fail; 662 } 663 } 664 665 kfree(save_connectors); 666 kfree(save_encoders); 667 return 0; 668 669 fail: 670 /* Restore all previous data. */ 671 count = 0; 672 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 673 *encoder = save_encoders[count++]; 674 } 675 676 count = 0; 677 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 678 *connector = save_connectors[count++]; 679 } 680 681 /* Try to restore the config */ 682 if (mode_changed && 683 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 684 save_set.y, save_set.fb)) 685 DRM_ERROR("failed to restore config after modeset failure\n"); 686 687 kfree(save_connectors); 688 kfree(save_encoders); 689 return ret; 690 } 691 EXPORT_SYMBOL(drm_crtc_helper_set_config); 692 693 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 694 { 695 int dpms = DRM_MODE_DPMS_OFF; 696 struct drm_connector *connector; 697 struct drm_device *dev = encoder->dev; 698 699 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 700 if (connector->encoder == encoder) 701 if (connector->dpms < dpms) 702 dpms = connector->dpms; 703 return dpms; 704 } 705 706 /* Helper which handles bridge ordering around encoder dpms */ 707 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 708 { 709 struct drm_bridge *bridge = encoder->bridge; 710 const struct drm_encoder_helper_funcs *encoder_funcs; 711 712 if (mode == DRM_MODE_DPMS_ON) 713 drm_bridge_pre_enable(bridge); 714 else 715 drm_bridge_disable(bridge); 716 717 encoder_funcs = encoder->helper_private; 718 if (encoder_funcs->dpms) 719 encoder_funcs->dpms(encoder, mode); 720 721 if (mode == DRM_MODE_DPMS_ON) 722 drm_bridge_enable(bridge); 723 else 724 drm_bridge_post_disable(bridge); 725 } 726 727 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 728 { 729 int dpms = DRM_MODE_DPMS_OFF; 730 struct drm_connector *connector; 731 struct drm_device *dev = crtc->dev; 732 733 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 734 if (connector->encoder && connector->encoder->crtc == crtc) 735 if (connector->dpms < dpms) 736 dpms = connector->dpms; 737 return dpms; 738 } 739 740 /** 741 * drm_helper_connector_dpms() - connector dpms helper implementation 742 * @connector: affected connector 743 * @mode: DPMS mode 744 * 745 * This is the main helper function provided by the crtc helper framework for 746 * implementing the DPMS connector attribute. It computes the new desired DPMS 747 * state for all encoders and crtcs in the output mesh and calls the ->dpms() 748 * callback provided by the driver appropriately. 749 */ 750 void drm_helper_connector_dpms(struct drm_connector *connector, int mode) 751 { 752 struct drm_encoder *encoder = connector->encoder; 753 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 754 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 755 756 if (mode == connector->dpms) 757 return; 758 759 old_dpms = connector->dpms; 760 connector->dpms = mode; 761 762 if (encoder) 763 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 764 765 /* from off to on, do crtc then encoder */ 766 if (mode < old_dpms) { 767 if (crtc) { 768 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 769 if (crtc_funcs->dpms) 770 (*crtc_funcs->dpms) (crtc, 771 drm_helper_choose_crtc_dpms(crtc)); 772 } 773 if (encoder) 774 drm_helper_encoder_dpms(encoder, encoder_dpms); 775 } 776 777 /* from on to off, do encoder then crtc */ 778 if (mode > old_dpms) { 779 if (encoder) 780 drm_helper_encoder_dpms(encoder, encoder_dpms); 781 if (crtc) { 782 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 783 if (crtc_funcs->dpms) 784 (*crtc_funcs->dpms) (crtc, 785 drm_helper_choose_crtc_dpms(crtc)); 786 } 787 } 788 789 return; 790 } 791 EXPORT_SYMBOL(drm_helper_connector_dpms); 792 793 /** 794 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata 795 * @fb: drm_framebuffer object to fill out 796 * @mode_cmd: metadata from the userspace fb creation request 797 * 798 * This helper can be used in a drivers fb_create callback to pre-fill the fb's 799 * metadata fields. 800 */ 801 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 802 struct drm_mode_fb_cmd2 *mode_cmd) 803 { 804 int i; 805 806 fb->width = mode_cmd->width; 807 fb->height = mode_cmd->height; 808 for (i = 0; i < 4; i++) { 809 fb->pitches[i] = mode_cmd->pitches[i]; 810 fb->offsets[i] = mode_cmd->offsets[i]; 811 fb->modifier[i] = mode_cmd->modifier[i]; 812 } 813 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, 814 &fb->bits_per_pixel); 815 fb->pixel_format = mode_cmd->pixel_format; 816 fb->flags = mode_cmd->flags; 817 } 818 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 819 820 /** 821 * drm_helper_resume_force_mode - force-restore mode setting configuration 822 * @dev: drm_device which should be restored 823 * 824 * Drivers which use the mode setting helpers can use this function to 825 * force-restore the mode setting configuration e.g. on resume or when something 826 * else might have trampled over the hw state (like some overzealous old BIOSen 827 * tended to do). 828 * 829 * This helper doesn't provide a error return value since restoring the old 830 * config should never fail due to resource allocation issues since the driver 831 * has successfully set the restored configuration already. Hence this should 832 * boil down to the equivalent of a few dpms on calls, which also don't provide 833 * an error code. 834 * 835 * Drivers where simply restoring an old configuration again might fail (e.g. 836 * due to slight differences in allocating shared resources when the 837 * configuration is restored in a different order than when userspace set it up) 838 * need to use their own restore logic. 839 */ 840 void drm_helper_resume_force_mode(struct drm_device *dev) 841 { 842 struct drm_crtc *crtc; 843 struct drm_encoder *encoder; 844 const struct drm_crtc_helper_funcs *crtc_funcs; 845 int encoder_dpms; 846 bool ret; 847 848 drm_modeset_lock_all(dev); 849 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 850 851 if (!crtc->enabled) 852 continue; 853 854 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 855 crtc->x, crtc->y, crtc->primary->fb); 856 857 /* Restoring the old config should never fail! */ 858 if (ret == false) 859 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 860 861 /* Turn off outputs that were already powered off */ 862 if (drm_helper_choose_crtc_dpms(crtc)) { 863 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 864 865 if(encoder->crtc != crtc) 866 continue; 867 868 encoder_dpms = drm_helper_choose_encoder_dpms( 869 encoder); 870 871 drm_helper_encoder_dpms(encoder, encoder_dpms); 872 } 873 874 crtc_funcs = crtc->helper_private; 875 if (crtc_funcs->dpms) 876 (*crtc_funcs->dpms) (crtc, 877 drm_helper_choose_crtc_dpms(crtc)); 878 } 879 } 880 881 /* disable the unused connectors while restoring the modesetting */ 882 __drm_helper_disable_unused_functions(dev); 883 drm_modeset_unlock_all(dev); 884 } 885 EXPORT_SYMBOL(drm_helper_resume_force_mode); 886 887 /** 888 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers 889 * @crtc: DRM CRTC 890 * @mode: DRM display mode which userspace requested 891 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks 892 * @x: x offset of the CRTC scanout area on the underlying framebuffer 893 * @y: y offset of the CRTC scanout area on the underlying framebuffer 894 * @old_fb: previous framebuffer 895 * 896 * This function implements a callback useable as the ->mode_set callback 897 * required by the crtc helpers. Besides the atomic plane helper functions for 898 * the primary plane the driver must also provide the ->mode_set_nofb callback 899 * to set up the crtc. 900 * 901 * This is a transitional helper useful for converting drivers to the atomic 902 * interfaces. 903 */ 904 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode, 905 struct drm_display_mode *adjusted_mode, int x, int y, 906 struct drm_framebuffer *old_fb) 907 { 908 struct drm_crtc_state *crtc_state; 909 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 910 int ret; 911 912 if (crtc->funcs->atomic_duplicate_state) 913 crtc_state = crtc->funcs->atomic_duplicate_state(crtc); 914 else { 915 crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL); 916 if (!crtc_state) 917 return -ENOMEM; 918 if (crtc->state) 919 __drm_atomic_helper_crtc_duplicate_state(crtc, crtc_state); 920 else 921 crtc_state->crtc = crtc; 922 } 923 924 crtc_state->planes_changed = true; 925 crtc_state->mode_changed = true; 926 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode); 927 if (ret) 928 goto out; 929 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode); 930 931 if (crtc_funcs->atomic_check) { 932 ret = crtc_funcs->atomic_check(crtc, crtc_state); 933 if (ret) 934 goto out; 935 } 936 937 swap(crtc->state, crtc_state); 938 939 crtc_funcs->mode_set_nofb(crtc); 940 941 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb); 942 943 out: 944 if (crtc->funcs->atomic_destroy_state) 945 crtc->funcs->atomic_destroy_state(crtc, crtc_state); 946 else { 947 __drm_atomic_helper_crtc_destroy_state(crtc, crtc_state); 948 kfree(crtc_state); 949 } 950 951 return ret; 952 } 953 EXPORT_SYMBOL(drm_helper_crtc_mode_set); 954 955 /** 956 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers 957 * @crtc: DRM CRTC 958 * @x: x offset of the CRTC scanout area on the underlying framebuffer 959 * @y: y offset of the CRTC scanout area on the underlying framebuffer 960 * @old_fb: previous framebuffer 961 * 962 * This function implements a callback useable as the ->mode_set_base used 963 * required by the crtc helpers. The driver must provide the atomic plane helper 964 * functions for the primary plane. 965 * 966 * This is a transitional helper useful for converting drivers to the atomic 967 * interfaces. 968 */ 969 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y, 970 struct drm_framebuffer *old_fb) 971 { 972 struct drm_plane_state *plane_state; 973 struct drm_plane *plane = crtc->primary; 974 975 if (plane->funcs->atomic_duplicate_state) 976 plane_state = plane->funcs->atomic_duplicate_state(plane); 977 else if (plane->state) 978 plane_state = drm_atomic_helper_plane_duplicate_state(plane); 979 else 980 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL); 981 if (!plane_state) 982 return -ENOMEM; 983 plane_state->plane = plane; 984 985 plane_state->crtc = crtc; 986 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb); 987 plane_state->crtc_x = 0; 988 plane_state->crtc_y = 0; 989 plane_state->crtc_h = crtc->mode.vdisplay; 990 plane_state->crtc_w = crtc->mode.hdisplay; 991 plane_state->src_x = x << 16; 992 plane_state->src_y = y << 16; 993 plane_state->src_h = crtc->mode.vdisplay << 16; 994 plane_state->src_w = crtc->mode.hdisplay << 16; 995 996 return drm_plane_helper_commit(plane, plane_state, old_fb); 997 } 998 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base); 999