1/* $NetBSD: drm_crtc_helper.c,v 1.7 2021/12/18 23:44:57 riastradh Exp $ */ 2 3/* 4 * Copyright (c) 2006-2008 Intel Corporation 5 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> 6 * 7 * DRM core CRTC related functions 8 * 9 * Permission to use, copy, modify, distribute, and sell this software and its 10 * documentation for any purpose is hereby granted without fee, provided that 11 * the above copyright notice appear in all copies and that both that copyright 12 * notice and this permission notice appear in supporting documentation, and 13 * that the name of the copyright holders not be used in advertising or 14 * publicity pertaining to distribution of the software without specific, 15 * written prior permission. The copyright holders make no representations 16 * about the suitability of this software for any purpose. It is provided "as 17 * is" without express or implied warranty. 18 * 19 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 20 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 21 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 22 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 23 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 24 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 25 * OF THIS SOFTWARE. 26 * 27 * Authors: 28 * Keith Packard 29 * Eric Anholt <eric@anholt.net> 30 * Dave Airlie <airlied@linux.ie> 31 * Jesse Barnes <jesse.barnes@intel.com> 32 */ 33 34#include <sys/cdefs.h> 35__KERNEL_RCSID(0, "$NetBSD: drm_crtc_helper.c,v 1.7 2021/12/18 23:44:57 riastradh Exp $"); 36 37#include <linux/export.h> 38#include <linux/kernel.h> 39#include <linux/moduleparam.h> 40 41#include <drm/drm_atomic.h> 42#include <drm/drm_atomic_helper.h> 43#include <drm/drm_atomic_uapi.h> 44#include <drm/drm_bridge.h> 45#include <drm/drm_crtc.h> 46#include <drm/drm_crtc_helper.h> 47#include <drm/drm_drv.h> 48#include <drm/drm_edid.h> 49#include <drm/drm_encoder.h> 50#ifndef __NetBSD__ 51#include <drm/drm_fb_helper.h> 52#endif 53#include <drm/drm_fourcc.h> 54#include <drm/drm_plane_helper.h> 55#include <drm/drm_print.h> 56#include <drm/drm_vblank.h> 57 58#include "drm_crtc_helper_internal.h" 59 60/** 61 * DOC: overview 62 * 63 * The CRTC modeset helper library provides a default set_config implementation 64 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 65 * the same callbacks which drivers can use to e.g. restore the modeset 66 * configuration on resume with drm_helper_resume_force_mode(). 67 * 68 * Note that this helper library doesn't track the current power state of CRTCs 69 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even 70 * though the hardware is already in the desired state. This deficiency has been 71 * fixed in the atomic helpers. 72 * 73 * The driver callbacks are mostly compatible with the atomic modeset helpers, 74 * except for the handling of the primary plane: Atomic helpers require that the 75 * primary plane is implemented as a real standalone plane and not directly tied 76 * to the CRTC state. For easier transition this library provides functions to 77 * implement the old semantics required by the CRTC helpers using the new plane 78 * and atomic helper callbacks. 79 * 80 * Drivers are strongly urged to convert to the atomic helpers (by way of first 81 * converting to the plane helpers). New drivers must not use these functions 82 * but need to implement the atomic interface instead, potentially using the 83 * atomic helpers for that. 84 * 85 * These legacy modeset helpers use the same function table structures as 86 * all other modesetting helpers. See the documentation for struct 87 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct 88 * &drm_connector_helper_funcs. 89 */ 90 91/** 92 * drm_helper_encoder_in_use - check if a given encoder is in use 93 * @encoder: encoder to check 94 * 95 * Checks whether @encoder is with the current mode setting output configuration 96 * in use by any connector. This doesn't mean that it is actually enabled since 97 * the DPMS state is tracked separately. 98 * 99 * Returns: 100 * True if @encoder is used, false otherwise. 101 */ 102bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 103{ 104 struct drm_connector *connector; 105 struct drm_connector_list_iter conn_iter; 106 struct drm_device *dev = encoder->dev; 107 108 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 109 110 /* 111 * We can expect this mutex to be locked if we are not panicking. 112 * Locking is currently fubar in the panic handler. 113 */ 114 if (!oops_in_progress) { 115 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 116 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 117 } 118 119 120 drm_connector_list_iter_begin(dev, &conn_iter); 121 drm_for_each_connector_iter(connector, &conn_iter) { 122 if (connector->encoder == encoder) { 123 drm_connector_list_iter_end(&conn_iter); 124 return true; 125 } 126 } 127 drm_connector_list_iter_end(&conn_iter); 128 return false; 129} 130EXPORT_SYMBOL(drm_helper_encoder_in_use); 131 132/** 133 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 134 * @crtc: CRTC to check 135 * 136 * Checks whether @crtc is with the current mode setting output configuration 137 * in use by any connector. This doesn't mean that it is actually enabled since 138 * the DPMS state is tracked separately. 139 * 140 * Returns: 141 * True if @crtc is used, false otherwise. 142 */ 143bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 144{ 145 struct drm_encoder *encoder; 146 struct drm_device *dev = crtc->dev; 147 148 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 149 150 /* 151 * We can expect this mutex to be locked if we are not panicking. 152 * Locking is currently fubar in the panic handler. 153 */ 154 if (!oops_in_progress) 155 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 156 157 drm_for_each_encoder(encoder, dev) 158 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 159 return true; 160 return false; 161} 162EXPORT_SYMBOL(drm_helper_crtc_in_use); 163 164static void 165drm_encoder_disable(struct drm_encoder *encoder) 166{ 167 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 168 169 if (!encoder_funcs) 170 return; 171 172 if (encoder_funcs->disable) 173 (*encoder_funcs->disable)(encoder); 174 else if (encoder_funcs->dpms) 175 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 176} 177 178static void __drm_helper_disable_unused_functions(struct drm_device *dev) 179{ 180 struct drm_encoder *encoder; 181 struct drm_crtc *crtc; 182 183 drm_warn_on_modeset_not_all_locked(dev); 184 185 drm_for_each_encoder(encoder, dev) { 186 if (!drm_helper_encoder_in_use(encoder)) { 187 drm_encoder_disable(encoder); 188 /* disconnect encoder from any connector */ 189 encoder->crtc = NULL; 190 } 191 } 192 193 drm_for_each_crtc(crtc, dev) { 194 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 195 crtc->enabled = drm_helper_crtc_in_use(crtc); 196 if (!crtc->enabled) { 197 if (crtc_funcs->disable) 198 (*crtc_funcs->disable)(crtc); 199 else 200 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 201 crtc->primary->fb = NULL; 202 } 203 } 204} 205 206/** 207 * drm_helper_disable_unused_functions - disable unused objects 208 * @dev: DRM device 209 * 210 * This function walks through the entire mode setting configuration of @dev. It 211 * will remove any CRTC links of unused encoders and encoder links of 212 * disconnected connectors. Then it will disable all unused encoders and CRTCs 213 * either by calling their disable callback if available or by calling their 214 * dpms callback with DRM_MODE_DPMS_OFF. 215 * 216 * NOTE: 217 * 218 * This function is part of the legacy modeset helper library and will cause 219 * major confusion with atomic drivers. This is because atomic helpers guarantee 220 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 221 * on an enabled functions. drm_helper_disable_unused_functions() on the other 222 * hand throws such guarantees into the wind and calls disable hooks 223 * unconditionally on unused functions. 224 */ 225void drm_helper_disable_unused_functions(struct drm_device *dev) 226{ 227 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 228 229 drm_modeset_lock_all(dev); 230 __drm_helper_disable_unused_functions(dev); 231 drm_modeset_unlock_all(dev); 232} 233EXPORT_SYMBOL(drm_helper_disable_unused_functions); 234 235/* 236 * Check the CRTC we're going to map each output to vs. its current 237 * CRTC. If they don't match, we have to disable the output and the CRTC 238 * since the driver will have to re-route things. 239 */ 240static void 241drm_crtc_prepare_encoders(struct drm_device *dev) 242{ 243 const struct drm_encoder_helper_funcs *encoder_funcs; 244 struct drm_encoder *encoder; 245 246 drm_for_each_encoder(encoder, dev) { 247 encoder_funcs = encoder->helper_private; 248 if (!encoder_funcs) 249 continue; 250 251 /* Disable unused encoders */ 252 if (encoder->crtc == NULL) 253 drm_encoder_disable(encoder); 254 /* Disable encoders whose CRTC is about to change */ 255 if (encoder_funcs->get_crtc && 256 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 257 drm_encoder_disable(encoder); 258 } 259} 260 261/** 262 * drm_crtc_helper_set_mode - internal helper to set a mode 263 * @crtc: CRTC to program 264 * @mode: mode to use 265 * @x: horizontal offset into the surface 266 * @y: vertical offset into the surface 267 * @old_fb: old framebuffer, for cleanup 268 * 269 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 270 * to fixup or reject the mode prior to trying to set it. This is an internal 271 * helper that drivers could e.g. use to update properties that require the 272 * entire output pipe to be disabled and re-enabled in a new configuration. For 273 * example for changing whether audio is enabled on a hdmi link or for changing 274 * panel fitter or dither attributes. It is also called by the 275 * drm_crtc_helper_set_config() helper function to drive the mode setting 276 * sequence. 277 * 278 * Returns: 279 * True if the mode was set successfully, false otherwise. 280 */ 281bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 282 struct drm_display_mode *mode, 283 int x, int y, 284 struct drm_framebuffer *old_fb) 285{ 286 struct drm_device *dev = crtc->dev; 287 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 288 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 289 const struct drm_encoder_helper_funcs *encoder_funcs; 290 int saved_x, saved_y; 291 bool saved_enabled; 292 struct drm_encoder *encoder; 293 bool ret = true; 294 295 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 296 297 drm_warn_on_modeset_not_all_locked(dev); 298 299 saved_enabled = crtc->enabled; 300 crtc->enabled = drm_helper_crtc_in_use(crtc); 301 if (!crtc->enabled) 302 return true; 303 304 adjusted_mode = drm_mode_duplicate(dev, mode); 305 if (!adjusted_mode) { 306 crtc->enabled = saved_enabled; 307 return false; 308 } 309 310 saved_mode = crtc->mode; 311 saved_hwmode = crtc->hwmode; 312 saved_x = crtc->x; 313 saved_y = crtc->y; 314 315 /* Update crtc values up front so the driver can rely on them for mode 316 * setting. 317 */ 318 crtc->mode = *mode; 319 crtc->x = x; 320 crtc->y = y; 321 322 /* Pass our mode to the connectors and the CRTC to give them a chance to 323 * adjust it according to limitations or connector properties, and also 324 * a chance to reject the mode entirely. 325 */ 326 drm_for_each_encoder(encoder, dev) { 327 328 if (encoder->crtc != crtc) 329 continue; 330 331 encoder_funcs = encoder->helper_private; 332 if (!encoder_funcs) 333 continue; 334 335 encoder_funcs = encoder->helper_private; 336 if (encoder_funcs->mode_fixup) { 337 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 338 adjusted_mode))) { 339 DRM_DEBUG_KMS("Encoder fixup failed\n"); 340 goto done; 341 } 342 } 343 } 344 345 if (crtc_funcs->mode_fixup) { 346 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 347 adjusted_mode))) { 348 DRM_DEBUG_KMS("CRTC fixup failed\n"); 349 goto done; 350 } 351 } 352 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 353 354 crtc->hwmode = *adjusted_mode; 355 356 /* Prepare the encoders and CRTCs before setting the mode. */ 357 drm_for_each_encoder(encoder, dev) { 358 359 if (encoder->crtc != crtc) 360 continue; 361 362 encoder_funcs = encoder->helper_private; 363 if (!encoder_funcs) 364 continue; 365 366 /* Disable the encoders as the first thing we do. */ 367 if (encoder_funcs->prepare) 368 encoder_funcs->prepare(encoder); 369 } 370 371 drm_crtc_prepare_encoders(dev); 372 373 crtc_funcs->prepare(crtc); 374 375 /* Set up the DPLL and any encoders state that needs to adjust or depend 376 * on the DPLL. 377 */ 378 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 379 if (!ret) 380 goto done; 381 382 drm_for_each_encoder(encoder, dev) { 383 384 if (encoder->crtc != crtc) 385 continue; 386 387 encoder_funcs = encoder->helper_private; 388 if (!encoder_funcs) 389 continue; 390 391 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n", 392 encoder->base.id, encoder->name, mode->name); 393 if (encoder_funcs->mode_set) 394 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 395 } 396 397 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 398 crtc_funcs->commit(crtc); 399 400 drm_for_each_encoder(encoder, dev) { 401 402 if (encoder->crtc != crtc) 403 continue; 404 405 encoder_funcs = encoder->helper_private; 406 if (!encoder_funcs) 407 continue; 408 409 if (encoder_funcs->commit) 410 encoder_funcs->commit(encoder); 411 } 412 413 /* Calculate and store various constants which 414 * are later needed by vblank and swap-completion 415 * timestamping. They are derived from true hwmode. 416 */ 417 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 418 419 /* FIXME: add subpixel order */ 420done: 421 drm_mode_destroy(dev, adjusted_mode); 422 if (!ret) { 423 crtc->enabled = saved_enabled; 424 crtc->mode = saved_mode; 425 crtc->hwmode = saved_hwmode; 426 crtc->x = saved_x; 427 crtc->y = saved_y; 428 } 429 430 return ret; 431} 432EXPORT_SYMBOL(drm_crtc_helper_set_mode); 433 434static void 435drm_crtc_helper_disable(struct drm_crtc *crtc) 436{ 437 struct drm_device *dev = crtc->dev; 438 struct drm_connector *connector; 439 struct drm_encoder *encoder; 440 441 /* Decouple all encoders and their attached connectors from this crtc */ 442 drm_for_each_encoder(encoder, dev) { 443 struct drm_connector_list_iter conn_iter; 444 445 if (encoder->crtc != crtc) 446 continue; 447 448 drm_connector_list_iter_begin(dev, &conn_iter); 449 drm_for_each_connector_iter(connector, &conn_iter) { 450 if (connector->encoder != encoder) 451 continue; 452 453 connector->encoder = NULL; 454 455 /* 456 * drm_helper_disable_unused_functions() ought to be 457 * doing this, but since we've decoupled the encoder 458 * from the connector above, the required connection 459 * between them is henceforth no longer available. 460 */ 461 connector->dpms = DRM_MODE_DPMS_OFF; 462 463 /* we keep a reference while the encoder is bound */ 464 drm_connector_put(connector); 465 } 466 drm_connector_list_iter_end(&conn_iter); 467 } 468 469 __drm_helper_disable_unused_functions(dev); 470} 471 472/* 473 * For connectors that support multiple encoders, either the 474 * .atomic_best_encoder() or .best_encoder() operation must be implemented. 475 */ 476struct drm_encoder * 477drm_connector_get_single_encoder(struct drm_connector *connector) 478{ 479 struct drm_encoder *encoder; 480 481 WARN_ON(hweight32(connector->possible_encoders) > 1); 482 drm_connector_for_each_possible_encoder(connector, encoder) 483 return encoder; 484 485 return NULL; 486} 487 488/** 489 * drm_crtc_helper_set_config - set a new config from userspace 490 * @set: mode set configuration 491 * @ctx: lock acquire context, not used here 492 * 493 * The drm_crtc_helper_set_config() helper function implements the of 494 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 495 * helpers. 496 * 497 * It first tries to locate the best encoder for each connector by calling the 498 * connector @drm_connector_helper_funcs.best_encoder helper operation. 499 * 500 * After locating the appropriate encoders, the helper function will call the 501 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 502 * or reject it completely in which case an error will be returned to the 503 * application. If the new configuration after mode adjustment is identical to 504 * the current configuration the helper function will return without performing 505 * any other operation. 506 * 507 * If the adjusted mode is identical to the current mode but changes to the 508 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 509 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 510 * 511 * If the adjusted mode differs from the current mode, or if the 512 * ->mode_set_base() helper operation is not provided, the helper function 513 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 514 * and ->commit() CRTC and encoder helper operations, in that order. 515 * Alternatively it can also use the dpms and disable helper operations. For 516 * details see &struct drm_crtc_helper_funcs and struct 517 * &drm_encoder_helper_funcs. 518 * 519 * This function is deprecated. New drivers must implement atomic modeset 520 * support, for which this function is unsuitable. Instead drivers should use 521 * drm_atomic_helper_set_config(). 522 * 523 * Returns: 524 * Returns 0 on success, negative errno numbers on failure. 525 */ 526int drm_crtc_helper_set_config(struct drm_mode_set *set, 527 struct drm_modeset_acquire_ctx *ctx) 528{ 529 struct drm_device *dev; 530 struct drm_crtc **save_encoder_crtcs, *new_crtc; 531 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 532 bool mode_changed = false; /* if true do a full mode set */ 533 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 534 struct drm_connector *connector; 535 struct drm_connector_list_iter conn_iter; 536 int count = 0, ro, fail = 0; 537 const struct drm_crtc_helper_funcs *crtc_funcs; 538 struct drm_mode_set save_set; 539 int ret; 540 int i; 541 542 DRM_DEBUG_KMS("\n"); 543 544 BUG_ON(!set); 545 BUG_ON(!set->crtc); 546 BUG_ON(!set->crtc->helper_private); 547 548 /* Enforce sane interface api - has been abused by the fb helper. */ 549 BUG_ON(!set->mode && set->fb); 550 BUG_ON(set->fb && set->num_connectors == 0); 551 552 crtc_funcs = set->crtc->helper_private; 553 554 dev = set->crtc->dev; 555 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 556 557 if (!set->mode) 558 set->fb = NULL; 559 560 if (set->fb) { 561 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 562 set->crtc->base.id, set->crtc->name, 563 set->fb->base.id, 564 (int)set->num_connectors, set->x, set->y); 565 } else { 566 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 567 set->crtc->base.id, set->crtc->name); 568 drm_crtc_helper_disable(set->crtc); 569 return 0; 570 } 571 572 drm_warn_on_modeset_not_all_locked(dev); 573 574 /* 575 * Allocate space for the backup of all (non-pointer) encoder and 576 * connector data. 577 */ 578 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder, 579 sizeof(struct drm_crtc *), GFP_KERNEL); 580 if (!save_encoder_crtcs) 581 return -ENOMEM; 582 583 save_connector_encoders = kcalloc(dev->mode_config.num_connector, 584 sizeof(struct drm_encoder *), GFP_KERNEL); 585 if (!save_connector_encoders) { 586 kfree(save_encoder_crtcs); 587 return -ENOMEM; 588 } 589 590 /* 591 * Copy data. Note that driver private data is not affected. 592 * Should anything bad happen only the expected state is 593 * restored, not the drivers personal bookkeeping. 594 */ 595 count = 0; 596 drm_for_each_encoder(encoder, dev) { 597 save_encoder_crtcs[count++] = encoder->crtc; 598 } 599 600 count = 0; 601 drm_connector_list_iter_begin(dev, &conn_iter); 602 drm_for_each_connector_iter(connector, &conn_iter) 603 save_connector_encoders[count++] = connector->encoder; 604 drm_connector_list_iter_end(&conn_iter); 605 606 save_set.crtc = set->crtc; 607 save_set.mode = &set->crtc->mode; 608 save_set.x = set->crtc->x; 609 save_set.y = set->crtc->y; 610 save_set.fb = set->crtc->primary->fb; 611 612 /* We should be able to check here if the fb has the same properties 613 * and then just flip_or_move it */ 614 if (set->crtc->primary->fb != set->fb) { 615 /* If we have no fb then treat it as a full mode set */ 616 if (set->crtc->primary->fb == NULL) { 617 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 618 mode_changed = true; 619 } else if (set->fb->format != set->crtc->primary->fb->format) { 620 mode_changed = true; 621 } else 622 fb_changed = true; 623 } 624 625 if (set->x != set->crtc->x || set->y != set->crtc->y) 626 fb_changed = true; 627 628 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 629 DRM_DEBUG_KMS("modes are different, full mode set\n"); 630 drm_mode_debug_printmodeline(&set->crtc->mode); 631 drm_mode_debug_printmodeline(set->mode); 632 mode_changed = true; 633 } 634 635 /* take a reference on all unbound connectors in set, reuse the 636 * already taken reference for bound connectors 637 */ 638 for (ro = 0; ro < set->num_connectors; ro++) { 639 if (set->connectors[ro]->encoder) 640 continue; 641 drm_connector_get(set->connectors[ro]); 642 } 643 644 /* a) traverse passed in connector list and get encoders for them */ 645 count = 0; 646 drm_connector_list_iter_begin(dev, &conn_iter); 647 drm_for_each_connector_iter(connector, &conn_iter) { 648 const struct drm_connector_helper_funcs *connector_funcs = 649 connector->helper_private; 650 new_encoder = connector->encoder; 651 for (ro = 0; ro < set->num_connectors; ro++) { 652 if (set->connectors[ro] == connector) { 653 if (connector_funcs->best_encoder) 654 new_encoder = connector_funcs->best_encoder(connector); 655 else 656 new_encoder = drm_connector_get_single_encoder(connector); 657 658 /* if we can't get an encoder for a connector 659 we are setting now - then fail */ 660 if (new_encoder == NULL) 661 /* don't break so fail path works correct */ 662 fail = 1; 663 664 if (connector->dpms != DRM_MODE_DPMS_ON) { 665 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 666 mode_changed = true; 667 } 668 669 break; 670 } 671 } 672 673 if (new_encoder != connector->encoder) { 674 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 675 mode_changed = true; 676 /* If the encoder is reused for another connector, then 677 * the appropriate crtc will be set later. 678 */ 679 if (connector->encoder) 680 connector->encoder->crtc = NULL; 681 connector->encoder = new_encoder; 682 } 683 } 684 drm_connector_list_iter_end(&conn_iter); 685 686 if (fail) { 687 ret = -EINVAL; 688 goto fail; 689 } 690 691 count = 0; 692 drm_connector_list_iter_begin(dev, &conn_iter); 693 drm_for_each_connector_iter(connector, &conn_iter) { 694 if (!connector->encoder) 695 continue; 696 697 if (connector->encoder->crtc == set->crtc) 698 new_crtc = NULL; 699 else 700 new_crtc = connector->encoder->crtc; 701 702 for (ro = 0; ro < set->num_connectors; ro++) { 703 if (set->connectors[ro] == connector) 704 new_crtc = set->crtc; 705 } 706 707 /* Make sure the new CRTC will work with the encoder */ 708 if (new_crtc && 709 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 710 ret = -EINVAL; 711 drm_connector_list_iter_end(&conn_iter); 712 goto fail; 713 } 714 if (new_crtc != connector->encoder->crtc) { 715 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 716 mode_changed = true; 717 connector->encoder->crtc = new_crtc; 718 } 719 if (new_crtc) { 720 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 721 connector->base.id, connector->name, 722 new_crtc->base.id, new_crtc->name); 723 } else { 724 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 725 connector->base.id, connector->name); 726 } 727 } 728 drm_connector_list_iter_end(&conn_iter); 729 730 /* mode_set_base is not a required function */ 731 if (fb_changed && !crtc_funcs->mode_set_base) 732 mode_changed = true; 733 734 if (mode_changed) { 735 if (drm_helper_crtc_in_use(set->crtc)) { 736 DRM_DEBUG_KMS("attempting to set mode from" 737 " userspace\n"); 738 drm_mode_debug_printmodeline(set->mode); 739 set->crtc->primary->fb = set->fb; 740 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 741 set->x, set->y, 742 save_set.fb)) { 743 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 744 set->crtc->base.id, set->crtc->name); 745 set->crtc->primary->fb = save_set.fb; 746 ret = -EINVAL; 747 goto fail; 748 } 749 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 750 for (i = 0; i < set->num_connectors; i++) { 751 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 752 set->connectors[i]->name); 753 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 754 } 755 } 756 __drm_helper_disable_unused_functions(dev); 757 } else if (fb_changed) { 758 set->crtc->x = set->x; 759 set->crtc->y = set->y; 760 set->crtc->primary->fb = set->fb; 761 ret = crtc_funcs->mode_set_base(set->crtc, 762 set->x, set->y, save_set.fb); 763 if (ret != 0) { 764 set->crtc->x = save_set.x; 765 set->crtc->y = save_set.y; 766 set->crtc->primary->fb = save_set.fb; 767 goto fail; 768 } 769 } 770 771 kfree(save_connector_encoders); 772 kfree(save_encoder_crtcs); 773 return 0; 774 775fail: 776 /* Restore all previous data. */ 777 count = 0; 778 drm_for_each_encoder(encoder, dev) { 779 encoder->crtc = save_encoder_crtcs[count++]; 780 } 781 782 count = 0; 783 drm_connector_list_iter_begin(dev, &conn_iter); 784 drm_for_each_connector_iter(connector, &conn_iter) 785 connector->encoder = save_connector_encoders[count++]; 786 drm_connector_list_iter_end(&conn_iter); 787 788 /* after fail drop reference on all unbound connectors in set, let 789 * bound connectors keep their reference 790 */ 791 for (ro = 0; ro < set->num_connectors; ro++) { 792 if (set->connectors[ro]->encoder) 793 continue; 794 drm_connector_put(set->connectors[ro]); 795 } 796 797 /* Try to restore the config */ 798 if (mode_changed && 799 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 800 save_set.y, save_set.fb)) 801 DRM_ERROR("failed to restore config after modeset failure\n"); 802 803 kfree(save_connector_encoders); 804 kfree(save_encoder_crtcs); 805 return ret; 806} 807EXPORT_SYMBOL(drm_crtc_helper_set_config); 808 809static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 810{ 811 int dpms = DRM_MODE_DPMS_OFF; 812 struct drm_connector *connector; 813 struct drm_connector_list_iter conn_iter; 814 struct drm_device *dev = encoder->dev; 815 816 drm_connector_list_iter_begin(dev, &conn_iter); 817 drm_for_each_connector_iter(connector, &conn_iter) 818 if (connector->encoder == encoder) 819 if (connector->dpms < dpms) 820 dpms = connector->dpms; 821 drm_connector_list_iter_end(&conn_iter); 822 823 return dpms; 824} 825 826/* Helper which handles bridge ordering around encoder dpms */ 827static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 828{ 829 const struct drm_encoder_helper_funcs *encoder_funcs; 830 831 encoder_funcs = encoder->helper_private; 832 if (!encoder_funcs) 833 return; 834 835 if (encoder_funcs->dpms) 836 encoder_funcs->dpms(encoder, mode); 837} 838 839static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 840{ 841 int dpms = DRM_MODE_DPMS_OFF; 842 struct drm_connector *connector; 843 struct drm_connector_list_iter conn_iter; 844 struct drm_device *dev = crtc->dev; 845 846 drm_connector_list_iter_begin(dev, &conn_iter); 847 drm_for_each_connector_iter(connector, &conn_iter) 848 if (connector->encoder && connector->encoder->crtc == crtc) 849 if (connector->dpms < dpms) 850 dpms = connector->dpms; 851 drm_connector_list_iter_end(&conn_iter); 852 853 return dpms; 854} 855 856/** 857 * drm_helper_connector_dpms() - connector dpms helper implementation 858 * @connector: affected connector 859 * @mode: DPMS mode 860 * 861 * The drm_helper_connector_dpms() helper function implements the 862 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 863 * helpers. 864 * 865 * This is the main helper function provided by the CRTC helper framework for 866 * implementing the DPMS connector attribute. It computes the new desired DPMS 867 * state for all encoders and CRTCs in the output mesh and calls the 868 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 869 * provided by the driver. 870 * 871 * This function is deprecated. New drivers must implement atomic modeset 872 * support, where DPMS is handled in the DRM core. 873 * 874 * Returns: 875 * Always returns 0. 876 */ 877int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 878{ 879 struct drm_encoder *encoder = connector->encoder; 880 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 881 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 882 883 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev)); 884 885 if (mode == connector->dpms) 886 return 0; 887 888 old_dpms = connector->dpms; 889 connector->dpms = mode; 890 891 if (encoder) 892 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 893 894 /* from off to on, do crtc then encoder */ 895 if (mode < old_dpms) { 896 if (crtc) { 897 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 898 if (crtc_funcs->dpms) 899 (*crtc_funcs->dpms) (crtc, 900 drm_helper_choose_crtc_dpms(crtc)); 901 } 902 if (encoder) 903 drm_helper_encoder_dpms(encoder, encoder_dpms); 904 } 905 906 /* from on to off, do encoder then crtc */ 907 if (mode > old_dpms) { 908 if (encoder) 909 drm_helper_encoder_dpms(encoder, encoder_dpms); 910 if (crtc) { 911 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 912 if (crtc_funcs->dpms) 913 (*crtc_funcs->dpms) (crtc, 914 drm_helper_choose_crtc_dpms(crtc)); 915 } 916 } 917 918 return 0; 919} 920EXPORT_SYMBOL(drm_helper_connector_dpms); 921 922/** 923 * drm_helper_resume_force_mode - force-restore mode setting configuration 924 * @dev: drm_device which should be restored 925 * 926 * Drivers which use the mode setting helpers can use this function to 927 * force-restore the mode setting configuration e.g. on resume or when something 928 * else might have trampled over the hw state (like some overzealous old BIOSen 929 * tended to do). 930 * 931 * This helper doesn't provide a error return value since restoring the old 932 * config should never fail due to resource allocation issues since the driver 933 * has successfully set the restored configuration already. Hence this should 934 * boil down to the equivalent of a few dpms on calls, which also don't provide 935 * an error code. 936 * 937 * Drivers where simply restoring an old configuration again might fail (e.g. 938 * due to slight differences in allocating shared resources when the 939 * configuration is restored in a different order than when userspace set it up) 940 * need to use their own restore logic. 941 * 942 * This function is deprecated. New drivers should implement atomic mode- 943 * setting and use the atomic suspend/resume helpers. 944 * 945 * See also: 946 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 947 */ 948void drm_helper_resume_force_mode(struct drm_device *dev) 949{ 950 struct drm_crtc *crtc; 951 struct drm_encoder *encoder; 952 const struct drm_crtc_helper_funcs *crtc_funcs; 953 int encoder_dpms; 954 bool ret; 955 956 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 957 958 drm_modeset_lock_all(dev); 959 drm_for_each_crtc(crtc, dev) { 960 961 if (!crtc->enabled) 962 continue; 963 964 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 965 crtc->x, crtc->y, crtc->primary->fb); 966 967 /* Restoring the old config should never fail! */ 968 if (ret == false) 969 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 970 971 /* Turn off outputs that were already powered off */ 972 if (drm_helper_choose_crtc_dpms(crtc)) { 973 drm_for_each_encoder(encoder, dev) { 974 975 if(encoder->crtc != crtc) 976 continue; 977 978 encoder_dpms = drm_helper_choose_encoder_dpms( 979 encoder); 980 981 drm_helper_encoder_dpms(encoder, encoder_dpms); 982 } 983 984 crtc_funcs = crtc->helper_private; 985 if (crtc_funcs->dpms) 986 (*crtc_funcs->dpms) (crtc, 987 drm_helper_choose_crtc_dpms(crtc)); 988 } 989 } 990 991 /* disable the unused connectors while restoring the modesetting */ 992 __drm_helper_disable_unused_functions(dev); 993 drm_modeset_unlock_all(dev); 994} 995EXPORT_SYMBOL(drm_helper_resume_force_mode); 996 997/** 998 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs 999 * @dev: DRM device whose CRTCs to turn off 1000 * 1001 * Drivers may want to call this on unload to ensure that all displays are 1002 * unlit and the GPU is in a consistent, low power state. Takes modeset locks. 1003 * 1004 * Note: This should only be used by non-atomic legacy drivers. For an atomic 1005 * version look at drm_atomic_helper_shutdown(). 1006 * 1007 * Returns: 1008 * Zero on success, error code on failure. 1009 */ 1010int drm_helper_force_disable_all(struct drm_device *dev) 1011{ 1012 struct drm_crtc *crtc; 1013 int ret = 0; 1014 1015 drm_modeset_lock_all(dev); 1016 drm_for_each_crtc(crtc, dev) 1017 if (crtc->enabled) { 1018 struct drm_mode_set set = { 1019 .crtc = crtc, 1020 }; 1021 1022 ret = drm_mode_set_config_internal(&set); 1023 if (ret) 1024 goto out; 1025 } 1026out: 1027 drm_modeset_unlock_all(dev); 1028 return ret; 1029} 1030EXPORT_SYMBOL(drm_helper_force_disable_all); 1031