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 <uapi_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 0 127 if (!oops_in_progress) { 128 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 129 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 130 } 131 #endif 132 133 drm_for_each_connector(connector, dev) 134 if (connector->encoder == encoder) 135 return true; 136 return false; 137 } 138 EXPORT_SYMBOL(drm_helper_encoder_in_use); 139 140 /** 141 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 142 * @crtc: CRTC to check 143 * 144 * Checks whether @crtc is with the current mode setting output configuration 145 * in use by any connector. This doesn't mean that it is actually enabled since 146 * the DPMS state is tracked separately. 147 * 148 * Returns: 149 * True if @crtc is used, false otherwise. 150 */ 151 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 152 { 153 struct drm_encoder *encoder; 154 struct drm_device *dev = crtc->dev; 155 156 /* 157 * We can expect this mutex to be locked if we are not panicking. 158 * Locking is currently fubar in the panic handler. 159 */ 160 #if 0 161 if (!oops_in_progress) 162 #endif 163 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 164 165 drm_for_each_encoder(encoder, dev) 166 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 167 return true; 168 return false; 169 } 170 EXPORT_SYMBOL(drm_helper_crtc_in_use); 171 172 static void 173 drm_encoder_disable(struct drm_encoder *encoder) 174 { 175 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 176 177 drm_bridge_disable(encoder->bridge); 178 179 if (encoder_funcs->disable) 180 (*encoder_funcs->disable)(encoder); 181 else 182 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 183 184 drm_bridge_post_disable(encoder->bridge); 185 } 186 187 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 188 { 189 struct drm_encoder *encoder; 190 struct drm_crtc *crtc; 191 192 drm_warn_on_modeset_not_all_locked(dev); 193 194 drm_for_each_encoder(encoder, dev) { 195 if (!drm_helper_encoder_in_use(encoder)) { 196 drm_encoder_disable(encoder); 197 /* disconnect encoder from any connector */ 198 encoder->crtc = NULL; 199 } 200 } 201 202 drm_for_each_crtc(crtc, dev) { 203 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 204 crtc->enabled = drm_helper_crtc_in_use(crtc); 205 if (!crtc->enabled) { 206 if (crtc_funcs->disable) 207 (*crtc_funcs->disable)(crtc); 208 else 209 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 210 crtc->primary->fb = NULL; 211 } 212 } 213 } 214 215 /** 216 * drm_helper_disable_unused_functions - disable unused objects 217 * @dev: DRM device 218 * 219 * This function walks through the entire mode setting configuration of @dev. It 220 * will remove any CRTC links of unused encoders and encoder links of 221 * disconnected connectors. Then it will disable all unused encoders and CRTCs 222 * either by calling their disable callback if available or by calling their 223 * dpms callback with DRM_MODE_DPMS_OFF. 224 * 225 * NOTE: 226 * 227 * This function is part of the legacy modeset helper library and will cause 228 * major confusion with atomic drivers. This is because atomic helpers guarantee 229 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 230 * on an enabled functions. drm_helper_disable_unused_functions() on the other 231 * hand throws such guarantees into the wind and calls disable hooks 232 * unconditionally on unused functions. 233 */ 234 void drm_helper_disable_unused_functions(struct drm_device *dev) 235 { 236 drm_modeset_lock_all(dev); 237 __drm_helper_disable_unused_functions(dev); 238 drm_modeset_unlock_all(dev); 239 } 240 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 241 242 /* 243 * Check the CRTC we're going to map each output to vs. its current 244 * CRTC. If they don't match, we have to disable the output and the CRTC 245 * since the driver will have to re-route things. 246 */ 247 static void 248 drm_crtc_prepare_encoders(struct drm_device *dev) 249 { 250 const struct drm_encoder_helper_funcs *encoder_funcs; 251 struct drm_encoder *encoder; 252 253 drm_for_each_encoder(encoder, dev) { 254 encoder_funcs = encoder->helper_private; 255 /* Disable unused encoders */ 256 if (encoder->crtc == NULL) 257 drm_encoder_disable(encoder); 258 /* Disable encoders whose CRTC is about to change */ 259 if (encoder_funcs->get_crtc && 260 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 261 drm_encoder_disable(encoder); 262 } 263 } 264 265 /** 266 * drm_crtc_helper_set_mode - internal helper to set a mode 267 * @crtc: CRTC to program 268 * @mode: mode to use 269 * @x: horizontal offset into the surface 270 * @y: vertical offset into the surface 271 * @old_fb: old framebuffer, for cleanup 272 * 273 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 274 * to fixup or reject the mode prior to trying to set it. This is an internal 275 * helper that drivers could e.g. use to update properties that require the 276 * entire output pipe to be disabled and re-enabled in a new configuration. For 277 * example for changing whether audio is enabled on a hdmi link or for changing 278 * panel fitter or dither attributes. It is also called by the 279 * drm_crtc_helper_set_config() helper function to drive the mode setting 280 * sequence. 281 * 282 * Returns: 283 * True if the mode was set successfully, false otherwise. 284 */ 285 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 286 struct drm_display_mode *mode, 287 int x, int y, 288 struct drm_framebuffer *old_fb) 289 { 290 struct drm_device *dev = crtc->dev; 291 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 292 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 293 const struct drm_encoder_helper_funcs *encoder_funcs; 294 int saved_x, saved_y; 295 bool saved_enabled; 296 struct drm_encoder *encoder; 297 bool ret = true; 298 299 drm_warn_on_modeset_not_all_locked(dev); 300 301 saved_enabled = crtc->enabled; 302 crtc->enabled = drm_helper_crtc_in_use(crtc); 303 if (!crtc->enabled) 304 return true; 305 306 adjusted_mode = drm_mode_duplicate(dev, mode); 307 if (!adjusted_mode) { 308 crtc->enabled = saved_enabled; 309 return false; 310 } 311 312 saved_mode = crtc->mode; 313 saved_hwmode = crtc->hwmode; 314 saved_x = crtc->x; 315 saved_y = crtc->y; 316 317 /* Update crtc values up front so the driver can rely on them for mode 318 * setting. 319 */ 320 crtc->mode = *mode; 321 crtc->x = x; 322 crtc->y = y; 323 324 /* Pass our mode to the connectors and the CRTC to give them a chance to 325 * adjust it according to limitations or connector properties, and also 326 * a chance to reject the mode entirely. 327 */ 328 drm_for_each_encoder(encoder, dev) { 329 330 if (encoder->crtc != crtc) 331 continue; 332 333 ret = drm_bridge_mode_fixup(encoder->bridge, 334 mode, adjusted_mode); 335 if (!ret) { 336 DRM_DEBUG_KMS("Bridge fixup failed\n"); 337 goto done; 338 } 339 340 encoder_funcs = encoder->helper_private; 341 if (encoder_funcs->mode_fixup) { 342 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 343 adjusted_mode))) { 344 DRM_DEBUG_KMS("Encoder fixup failed\n"); 345 goto done; 346 } 347 } 348 } 349 350 if (crtc_funcs->mode_fixup) { 351 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 352 adjusted_mode))) { 353 DRM_DEBUG_KMS("CRTC fixup failed\n"); 354 goto done; 355 } 356 } 357 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 358 359 crtc->hwmode = *adjusted_mode; 360 361 /* Prepare the encoders and CRTCs before setting the mode. */ 362 drm_for_each_encoder(encoder, dev) { 363 364 if (encoder->crtc != crtc) 365 continue; 366 367 drm_bridge_disable(encoder->bridge); 368 369 encoder_funcs = encoder->helper_private; 370 /* Disable the encoders as the first thing we do. */ 371 encoder_funcs->prepare(encoder); 372 373 drm_bridge_post_disable(encoder->bridge); 374 } 375 376 drm_crtc_prepare_encoders(dev); 377 378 crtc_funcs->prepare(crtc); 379 380 /* Set up the DPLL and any encoders state that needs to adjust or depend 381 * on the DPLL. 382 */ 383 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 384 if (!ret) 385 goto done; 386 387 drm_for_each_encoder(encoder, dev) { 388 389 if (encoder->crtc != crtc) 390 continue; 391 392 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 393 encoder->base.id, encoder->name, 394 mode->base.id, mode->name); 395 encoder_funcs = encoder->helper_private; 396 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 397 398 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode); 399 } 400 401 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 402 crtc_funcs->commit(crtc); 403 404 drm_for_each_encoder(encoder, dev) { 405 406 if (encoder->crtc != crtc) 407 continue; 408 409 drm_bridge_pre_enable(encoder->bridge); 410 411 encoder_funcs = encoder->helper_private; 412 encoder_funcs->commit(encoder); 413 414 drm_bridge_enable(encoder->bridge); 415 } 416 417 /* Calculate and store various constants which 418 * are later needed by vblank and swap-completion 419 * timestamping. They are derived from true hwmode. 420 */ 421 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 422 423 /* FIXME: add subpixel order */ 424 done: 425 drm_mode_destroy(dev, adjusted_mode); 426 if (!ret) { 427 crtc->enabled = saved_enabled; 428 crtc->mode = saved_mode; 429 crtc->hwmode = saved_hwmode; 430 crtc->x = saved_x; 431 crtc->y = saved_y; 432 } 433 434 return ret; 435 } 436 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 437 438 static void 439 drm_crtc_helper_disable(struct drm_crtc *crtc) 440 { 441 struct drm_device *dev = crtc->dev; 442 struct drm_connector *connector; 443 struct drm_encoder *encoder; 444 445 /* Decouple all encoders and their attached connectors from this crtc */ 446 drm_for_each_encoder(encoder, dev) { 447 if (encoder->crtc != crtc) 448 continue; 449 450 drm_for_each_connector(connector, dev) { 451 if (connector->encoder != encoder) 452 continue; 453 454 connector->encoder = NULL; 455 456 /* 457 * drm_helper_disable_unused_functions() ought to be 458 * doing this, but since we've decoupled the encoder 459 * from the connector above, the required connection 460 * between them is henceforth no longer available. 461 */ 462 connector->dpms = DRM_MODE_DPMS_OFF; 463 } 464 } 465 466 __drm_helper_disable_unused_functions(dev); 467 } 468 469 /** 470 * drm_crtc_helper_set_config - set a new config from userspace 471 * @set: mode set configuration 472 * 473 * The drm_crtc_helper_set_config() helper function implements the set_config 474 * callback of struct &drm_crtc_funcs for drivers using the legacy CRTC helpers. 475 * 476 * It first tries to locate the best encoder for each connector by calling the 477 * connector ->best_encoder() (struct &drm_connector_helper_funcs) helper 478 * operation. 479 * 480 * After locating the appropriate encoders, the helper function will call the 481 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 482 * or reject it completely in which case an error will be returned to the 483 * application. If the new configuration after mode adjustment is identical to 484 * the current configuration the helper function will return without performing 485 * any other operation. 486 * 487 * If the adjusted mode is identical to the current mode but changes to the 488 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 489 * will call the CRTC ->mode_set_base() (struct &drm_crtc_helper_funcs) helper 490 * operation. 491 * 492 * If the adjusted mode differs from the current mode, or if the 493 * ->mode_set_base() helper operation is not provided, the helper function 494 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 495 * and ->commit() CRTC and encoder helper operations, in that order. 496 * Alternatively it can also use the dpms and disable helper operations. For 497 * details see struct &drm_crtc_helper_funcs and struct 498 * &drm_encoder_helper_funcs. 499 * 500 * This function is deprecated. New drivers must implement atomic modeset 501 * support, for which this function is unsuitable. Instead drivers should use 502 * drm_atomic_helper_set_config(). 503 * 504 * Returns: 505 * Returns 0 on success, negative errno numbers on failure. 506 */ 507 int drm_crtc_helper_set_config(struct drm_mode_set *set) 508 { 509 struct drm_device *dev; 510 struct drm_crtc *new_crtc; 511 struct drm_encoder *save_encoders, *new_encoder, *encoder; 512 bool mode_changed = false; /* if true do a full mode set */ 513 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 514 struct drm_connector *save_connectors, *connector; 515 int count = 0, ro, fail = 0; 516 const struct drm_crtc_helper_funcs *crtc_funcs; 517 struct drm_mode_set save_set; 518 int ret; 519 int i; 520 521 DRM_DEBUG_KMS("\n"); 522 523 BUG_ON(!set); 524 BUG_ON(!set->crtc); 525 BUG_ON(!set->crtc->helper_private); 526 527 /* Enforce sane interface api - has been abused by the fb helper. */ 528 BUG_ON(!set->mode && set->fb); 529 BUG_ON(set->fb && set->num_connectors == 0); 530 531 crtc_funcs = set->crtc->helper_private; 532 533 if (!set->mode) 534 set->fb = NULL; 535 536 if (set->fb) { 537 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 538 set->crtc->base.id, set->crtc->name, 539 set->fb->base.id, 540 (int)set->num_connectors, set->x, set->y); 541 } else { 542 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 543 set->crtc->base.id, set->crtc->name); 544 drm_crtc_helper_disable(set->crtc); 545 return 0; 546 } 547 548 dev = set->crtc->dev; 549 550 drm_warn_on_modeset_not_all_locked(dev); 551 552 /* 553 * Allocate space for the backup of all (non-pointer) encoder and 554 * connector data. 555 */ 556 save_encoders = kzalloc(dev->mode_config.num_encoder * 557 sizeof(struct drm_encoder), GFP_KERNEL); 558 if (!save_encoders) 559 return -ENOMEM; 560 561 save_connectors = kzalloc(dev->mode_config.num_connector * 562 sizeof(struct drm_connector), GFP_KERNEL); 563 if (!save_connectors) { 564 kfree(save_encoders); 565 return -ENOMEM; 566 } 567 568 /* 569 * Copy data. Note that driver private data is not affected. 570 * Should anything bad happen only the expected state is 571 * restored, not the drivers personal bookkeeping. 572 */ 573 count = 0; 574 drm_for_each_encoder(encoder, dev) { 575 save_encoders[count++] = *encoder; 576 } 577 578 count = 0; 579 drm_for_each_connector(connector, dev) { 580 save_connectors[count++] = *connector; 581 } 582 583 save_set.crtc = set->crtc; 584 save_set.mode = &set->crtc->mode; 585 save_set.x = set->crtc->x; 586 save_set.y = set->crtc->y; 587 save_set.fb = set->crtc->primary->fb; 588 589 /* We should be able to check here if the fb has the same properties 590 * and then just flip_or_move it */ 591 if (set->crtc->primary->fb != set->fb) { 592 /* If we have no fb then treat it as a full mode set */ 593 if (set->crtc->primary->fb == NULL) { 594 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 595 mode_changed = true; 596 } else if (set->fb->pixel_format != 597 set->crtc->primary->fb->pixel_format) { 598 mode_changed = true; 599 } else 600 fb_changed = true; 601 } 602 603 if (set->x != set->crtc->x || set->y != set->crtc->y) 604 fb_changed = true; 605 606 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 607 DRM_DEBUG_KMS("modes are different, full mode set\n"); 608 drm_mode_debug_printmodeline(&set->crtc->mode); 609 drm_mode_debug_printmodeline(set->mode); 610 mode_changed = true; 611 } 612 613 /* a) traverse passed in connector list and get encoders for them */ 614 count = 0; 615 drm_for_each_connector(connector, dev) { 616 const struct drm_connector_helper_funcs *connector_funcs = 617 connector->helper_private; 618 new_encoder = connector->encoder; 619 for (ro = 0; ro < set->num_connectors; ro++) { 620 if (set->connectors[ro] == connector) { 621 new_encoder = connector_funcs->best_encoder(connector); 622 /* if we can't get an encoder for a connector 623 we are setting now - then fail */ 624 if (new_encoder == NULL) 625 /* don't break so fail path works correct */ 626 fail = 1; 627 628 if (connector->dpms != DRM_MODE_DPMS_ON) { 629 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 630 mode_changed = true; 631 } 632 633 break; 634 } 635 } 636 637 if (new_encoder != connector->encoder) { 638 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 639 mode_changed = true; 640 /* If the encoder is reused for another connector, then 641 * the appropriate crtc will be set later. 642 */ 643 if (connector->encoder) 644 connector->encoder->crtc = NULL; 645 connector->encoder = new_encoder; 646 } 647 } 648 649 if (fail) { 650 ret = -EINVAL; 651 goto fail; 652 } 653 654 count = 0; 655 drm_for_each_connector(connector, dev) { 656 if (!connector->encoder) 657 continue; 658 659 if (connector->encoder->crtc == set->crtc) 660 new_crtc = NULL; 661 else 662 new_crtc = connector->encoder->crtc; 663 664 for (ro = 0; ro < set->num_connectors; ro++) { 665 if (set->connectors[ro] == connector) 666 new_crtc = set->crtc; 667 } 668 669 /* Make sure the new CRTC will work with the encoder */ 670 if (new_crtc && 671 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 672 ret = -EINVAL; 673 goto fail; 674 } 675 if (new_crtc != connector->encoder->crtc) { 676 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 677 mode_changed = true; 678 connector->encoder->crtc = new_crtc; 679 } 680 if (new_crtc) { 681 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 682 connector->base.id, connector->name, 683 new_crtc->base.id, new_crtc->name); 684 } else { 685 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 686 connector->base.id, connector->name); 687 } 688 } 689 690 /* mode_set_base is not a required function */ 691 if (fb_changed && !crtc_funcs->mode_set_base) 692 mode_changed = true; 693 694 if (mode_changed) { 695 if (drm_helper_crtc_in_use(set->crtc)) { 696 DRM_DEBUG_KMS("attempting to set mode from" 697 " userspace\n"); 698 drm_mode_debug_printmodeline(set->mode); 699 set->crtc->primary->fb = set->fb; 700 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 701 set->x, set->y, 702 save_set.fb)) { 703 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 704 set->crtc->base.id, set->crtc->name); 705 set->crtc->primary->fb = save_set.fb; 706 ret = -EINVAL; 707 goto fail; 708 } 709 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 710 for (i = 0; i < set->num_connectors; i++) { 711 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 712 set->connectors[i]->name); 713 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 714 } 715 } 716 __drm_helper_disable_unused_functions(dev); 717 } else if (fb_changed) { 718 set->crtc->x = set->x; 719 set->crtc->y = set->y; 720 set->crtc->primary->fb = set->fb; 721 ret = crtc_funcs->mode_set_base(set->crtc, 722 set->x, set->y, save_set.fb); 723 if (ret != 0) { 724 set->crtc->x = save_set.x; 725 set->crtc->y = save_set.y; 726 set->crtc->primary->fb = save_set.fb; 727 goto fail; 728 } 729 } 730 731 kfree(save_connectors); 732 kfree(save_encoders); 733 return 0; 734 735 fail: 736 /* Restore all previous data. */ 737 count = 0; 738 drm_for_each_encoder(encoder, dev) { 739 *encoder = save_encoders[count++]; 740 } 741 742 count = 0; 743 drm_for_each_connector(connector, dev) { 744 *connector = save_connectors[count++]; 745 } 746 747 /* Try to restore the config */ 748 if (mode_changed && 749 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 750 save_set.y, save_set.fb)) 751 DRM_ERROR("failed to restore config after modeset failure\n"); 752 753 kfree(save_connectors); 754 kfree(save_encoders); 755 return ret; 756 } 757 EXPORT_SYMBOL(drm_crtc_helper_set_config); 758 759 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 760 { 761 int dpms = DRM_MODE_DPMS_OFF; 762 struct drm_connector *connector; 763 struct drm_device *dev = encoder->dev; 764 765 drm_for_each_connector(connector, dev) 766 if (connector->encoder == encoder) 767 if (connector->dpms < dpms) 768 dpms = connector->dpms; 769 return dpms; 770 } 771 772 /* Helper which handles bridge ordering around encoder dpms */ 773 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 774 { 775 struct drm_bridge *bridge = encoder->bridge; 776 const struct drm_encoder_helper_funcs *encoder_funcs; 777 778 if (mode == DRM_MODE_DPMS_ON) 779 drm_bridge_pre_enable(bridge); 780 else 781 drm_bridge_disable(bridge); 782 783 encoder_funcs = encoder->helper_private; 784 if (encoder_funcs->dpms) 785 encoder_funcs->dpms(encoder, mode); 786 787 if (mode == DRM_MODE_DPMS_ON) 788 drm_bridge_enable(bridge); 789 else 790 drm_bridge_post_disable(bridge); 791 } 792 793 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 794 { 795 int dpms = DRM_MODE_DPMS_OFF; 796 struct drm_connector *connector; 797 struct drm_device *dev = crtc->dev; 798 799 drm_for_each_connector(connector, dev) 800 if (connector->encoder && connector->encoder->crtc == crtc) 801 if (connector->dpms < dpms) 802 dpms = connector->dpms; 803 return dpms; 804 } 805 806 /** 807 * drm_helper_connector_dpms() - connector dpms helper implementation 808 * @connector: affected connector 809 * @mode: DPMS mode 810 * 811 * The drm_helper_connector_dpms() helper function implements the ->dpms() 812 * callback of struct &drm_connector_funcs for drivers using the legacy CRTC helpers. 813 * 814 * This is the main helper function provided by the CRTC helper framework for 815 * implementing the DPMS connector attribute. It computes the new desired DPMS 816 * state for all encoders and CRTCs in the output mesh and calls the ->dpms() 817 * callbacks provided by the driver in struct &drm_crtc_helper_funcs and struct 818 * &drm_encoder_helper_funcs appropriately. 819 * 820 * This function is deprecated. New drivers must implement atomic modeset 821 * support, for which this function is unsuitable. Instead drivers should use 822 * drm_atomic_helper_connector_dpms(). 823 * 824 * Returns: 825 * Always returns 0. 826 */ 827 int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 828 { 829 struct drm_encoder *encoder = connector->encoder; 830 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 831 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 832 833 if (mode == connector->dpms) 834 return 0; 835 836 old_dpms = connector->dpms; 837 connector->dpms = mode; 838 839 if (encoder) 840 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 841 842 /* from off to on, do crtc then encoder */ 843 if (mode < old_dpms) { 844 if (crtc) { 845 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 846 if (crtc_funcs->dpms) 847 (*crtc_funcs->dpms) (crtc, 848 drm_helper_choose_crtc_dpms(crtc)); 849 } 850 if (encoder) 851 drm_helper_encoder_dpms(encoder, encoder_dpms); 852 } 853 854 /* from on to off, do encoder then crtc */ 855 if (mode > old_dpms) { 856 if (encoder) 857 drm_helper_encoder_dpms(encoder, encoder_dpms); 858 if (crtc) { 859 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 860 if (crtc_funcs->dpms) 861 (*crtc_funcs->dpms) (crtc, 862 drm_helper_choose_crtc_dpms(crtc)); 863 } 864 } 865 866 return 0; 867 } 868 EXPORT_SYMBOL(drm_helper_connector_dpms); 869 870 /** 871 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata 872 * @fb: drm_framebuffer object to fill out 873 * @mode_cmd: metadata from the userspace fb creation request 874 * 875 * This helper can be used in a drivers fb_create callback to pre-fill the fb's 876 * metadata fields. 877 */ 878 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 879 const struct drm_mode_fb_cmd2 *mode_cmd) 880 { 881 int i; 882 883 fb->width = mode_cmd->width; 884 fb->height = mode_cmd->height; 885 for (i = 0; i < 4; i++) { 886 fb->pitches[i] = mode_cmd->pitches[i]; 887 fb->offsets[i] = mode_cmd->offsets[i]; 888 fb->modifier[i] = mode_cmd->modifier[i]; 889 } 890 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, 891 &fb->bits_per_pixel); 892 fb->pixel_format = mode_cmd->pixel_format; 893 fb->flags = mode_cmd->flags; 894 } 895 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 896 897 /** 898 * drm_helper_resume_force_mode - force-restore mode setting configuration 899 * @dev: drm_device which should be restored 900 * 901 * Drivers which use the mode setting helpers can use this function to 902 * force-restore the mode setting configuration e.g. on resume or when something 903 * else might have trampled over the hw state (like some overzealous old BIOSen 904 * tended to do). 905 * 906 * This helper doesn't provide a error return value since restoring the old 907 * config should never fail due to resource allocation issues since the driver 908 * has successfully set the restored configuration already. Hence this should 909 * boil down to the equivalent of a few dpms on calls, which also don't provide 910 * an error code. 911 * 912 * Drivers where simply restoring an old configuration again might fail (e.g. 913 * due to slight differences in allocating shared resources when the 914 * configuration is restored in a different order than when userspace set it up) 915 * need to use their own restore logic. 916 * 917 * This function is deprecated. New drivers should implement atomic mode- 918 * setting and use the atomic suspend/resume helpers. 919 * 920 * See also: 921 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 922 */ 923 void drm_helper_resume_force_mode(struct drm_device *dev) 924 { 925 struct drm_crtc *crtc; 926 struct drm_encoder *encoder; 927 const struct drm_crtc_helper_funcs *crtc_funcs; 928 int encoder_dpms; 929 bool ret; 930 931 drm_modeset_lock_all(dev); 932 drm_for_each_crtc(crtc, dev) { 933 934 if (!crtc->enabled) 935 continue; 936 937 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 938 crtc->x, crtc->y, crtc->primary->fb); 939 940 /* Restoring the old config should never fail! */ 941 if (ret == false) 942 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 943 944 /* Turn off outputs that were already powered off */ 945 if (drm_helper_choose_crtc_dpms(crtc)) { 946 drm_for_each_encoder(encoder, dev) { 947 948 if(encoder->crtc != crtc) 949 continue; 950 951 encoder_dpms = drm_helper_choose_encoder_dpms( 952 encoder); 953 954 drm_helper_encoder_dpms(encoder, encoder_dpms); 955 } 956 957 crtc_funcs = crtc->helper_private; 958 if (crtc_funcs->dpms) 959 (*crtc_funcs->dpms) (crtc, 960 drm_helper_choose_crtc_dpms(crtc)); 961 } 962 } 963 964 /* disable the unused connectors while restoring the modesetting */ 965 __drm_helper_disable_unused_functions(dev); 966 drm_modeset_unlock_all(dev); 967 } 968 EXPORT_SYMBOL(drm_helper_resume_force_mode); 969 970 /** 971 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers 972 * @crtc: DRM CRTC 973 * @mode: DRM display mode which userspace requested 974 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks 975 * @x: x offset of the CRTC scanout area on the underlying framebuffer 976 * @y: y offset of the CRTC scanout area on the underlying framebuffer 977 * @old_fb: previous framebuffer 978 * 979 * This function implements a callback useable as the ->mode_set callback 980 * required by the CRTC helpers. Besides the atomic plane helper functions for 981 * the primary plane the driver must also provide the ->mode_set_nofb callback 982 * to set up the CRTC. 983 * 984 * This is a transitional helper useful for converting drivers to the atomic 985 * interfaces. 986 */ 987 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode, 988 struct drm_display_mode *adjusted_mode, int x, int y, 989 struct drm_framebuffer *old_fb) 990 { 991 struct drm_crtc_state *crtc_state; 992 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 993 int ret; 994 995 if (crtc->funcs->atomic_duplicate_state) 996 crtc_state = crtc->funcs->atomic_duplicate_state(crtc); 997 else { 998 if (!crtc->state) 999 drm_atomic_helper_crtc_reset(crtc); 1000 1001 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc); 1002 } 1003 1004 if (!crtc_state) 1005 return -ENOMEM; 1006 1007 crtc_state->planes_changed = true; 1008 crtc_state->mode_changed = true; 1009 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode); 1010 if (ret) 1011 goto out; 1012 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode); 1013 1014 if (crtc_funcs->atomic_check) { 1015 ret = crtc_funcs->atomic_check(crtc, crtc_state); 1016 if (ret) 1017 goto out; 1018 } 1019 1020 swap(crtc->state, crtc_state); 1021 1022 crtc_funcs->mode_set_nofb(crtc); 1023 1024 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb); 1025 1026 out: 1027 if (crtc_state) { 1028 if (crtc->funcs->atomic_destroy_state) 1029 crtc->funcs->atomic_destroy_state(crtc, crtc_state); 1030 else 1031 drm_atomic_helper_crtc_destroy_state(crtc, crtc_state); 1032 } 1033 1034 return ret; 1035 } 1036 EXPORT_SYMBOL(drm_helper_crtc_mode_set); 1037 1038 /** 1039 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers 1040 * @crtc: DRM CRTC 1041 * @x: x offset of the CRTC scanout area on the underlying framebuffer 1042 * @y: y offset of the CRTC scanout area on the underlying framebuffer 1043 * @old_fb: previous framebuffer 1044 * 1045 * This function implements a callback useable as the ->mode_set_base used 1046 * required by the CRTC helpers. The driver must provide the atomic plane helper 1047 * functions for the primary plane. 1048 * 1049 * This is a transitional helper useful for converting drivers to the atomic 1050 * interfaces. 1051 */ 1052 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y, 1053 struct drm_framebuffer *old_fb) 1054 { 1055 struct drm_plane_state *plane_state; 1056 struct drm_plane *plane = crtc->primary; 1057 1058 if (plane->funcs->atomic_duplicate_state) 1059 plane_state = plane->funcs->atomic_duplicate_state(plane); 1060 else if (plane->state) 1061 plane_state = drm_atomic_helper_plane_duplicate_state(plane); 1062 else 1063 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL); 1064 if (!plane_state) 1065 return -ENOMEM; 1066 plane_state->plane = plane; 1067 1068 plane_state->crtc = crtc; 1069 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb); 1070 plane_state->crtc_x = 0; 1071 plane_state->crtc_y = 0; 1072 plane_state->crtc_h = crtc->mode.vdisplay; 1073 plane_state->crtc_w = crtc->mode.hdisplay; 1074 plane_state->src_x = x << 16; 1075 plane_state->src_y = y << 16; 1076 plane_state->src_h = crtc->mode.vdisplay << 16; 1077 plane_state->src_w = crtc->mode.hdisplay << 16; 1078 1079 return drm_plane_helper_commit(plane, plane_state, old_fb); 1080 } 1081 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base); 1082 1083 /** 1084 * drm_helper_crtc_enable_color_mgmt - enable color management properties 1085 * @crtc: DRM CRTC 1086 * @degamma_lut_size: the size of the degamma lut (before CSC) 1087 * @gamma_lut_size: the size of the gamma lut (after CSC) 1088 * 1089 * This function lets the driver enable the color correction properties on a 1090 * CRTC. This includes 3 degamma, csc and gamma properties that userspace can 1091 * set and 2 size properties to inform the userspace of the lut sizes. 1092 */ 1093 void drm_helper_crtc_enable_color_mgmt(struct drm_crtc *crtc, 1094 int degamma_lut_size, 1095 int gamma_lut_size) 1096 { 1097 struct drm_device *dev = crtc->dev; 1098 struct drm_mode_config *config = &dev->mode_config; 1099 1100 drm_object_attach_property(&crtc->base, 1101 config->degamma_lut_property, 0); 1102 drm_object_attach_property(&crtc->base, 1103 config->ctm_property, 0); 1104 drm_object_attach_property(&crtc->base, 1105 config->gamma_lut_property, 0); 1106 1107 drm_object_attach_property(&crtc->base, 1108 config->degamma_lut_size_property, 1109 degamma_lut_size); 1110 drm_object_attach_property(&crtc->base, 1111 config->gamma_lut_size_property, 1112 gamma_lut_size); 1113 } 1114 EXPORT_SYMBOL(drm_helper_crtc_enable_color_mgmt); 1115