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drm_crtc_helper.c
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linux-6.19.14/drivers/gpu/drm/drm_crtc_helper.c
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/kernel.h> 34#include <linux/moduleparam.h> 35#include <linux/dynamic_debug.h> 36 37#include <drm/drm_atomic.h> 38#include <drm/drm_atomic_helper.h> 39#include <drm/drm_atomic_uapi.h> 40#include <drm/drm_bridge.h> 41#include <drm/drm_crtc.h> 42#include <drm/drm_crtc_helper.h> 43#include <drm/drm_drv.h> 44#include <drm/drm_edid.h> 45#include <drm/drm_encoder.h> 46#include <drm/drm_fourcc.h> 47#include <drm/drm_framebuffer.h> 48#include <drm/drm_print.h> 49#include <drm/drm_vblank.h> 50 51#include "drm_crtc_helper_internal.h" 52 53DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0, 54 "DRM_UT_CORE", 55 "DRM_UT_DRIVER", 56 "DRM_UT_KMS", 57 "DRM_UT_PRIME", 58 "DRM_UT_ATOMIC", 59 "DRM_UT_VBL", 60 "DRM_UT_STATE", 61 "DRM_UT_LEASE", 62 "DRM_UT_DP", 63 "DRM_UT_DRMRES"); 64 65/** 66 * DOC: overview 67 * 68 * The CRTC modeset helper library provides a default set_config implementation 69 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 70 * the same callbacks which drivers can use to e.g. restore the modeset 71 * configuration on resume with drm_helper_resume_force_mode(). 72 * 73 * Note that this helper library doesn't track the current power state of CRTCs 74 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even 75 * though the hardware is already in the desired state. This deficiency has been 76 * fixed in the atomic helpers. 77 * 78 * The driver callbacks are mostly compatible with the atomic modeset helpers, 79 * except for the handling of the primary plane: Atomic helpers require that the 80 * primary plane is implemented as a real standalone plane and not directly tied 81 * to the CRTC state. For easier transition this library provides functions to 82 * implement the old semantics required by the CRTC helpers using the new plane 83 * and atomic helper callbacks. 84 * 85 * Drivers are strongly urged to convert to the atomic helpers (by way of first 86 * converting to the plane helpers). New drivers must not use these functions 87 * but need to implement the atomic interface instead, potentially using the 88 * atomic helpers for that. 89 * 90 * These legacy modeset helpers use the same function table structures as 91 * all other modesetting helpers. See the documentation for struct 92 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct 93 * &drm_connector_helper_funcs. 94 */ 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 */ 107bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 108{ 109 struct drm_connector *connector; 110 struct drm_connector_list_iter conn_iter; 111 struct drm_device *dev = encoder->dev; 112 113 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev)); 114 115 /* 116 * We can expect this mutex to be locked if we are not panicking. 117 * Locking is currently fubar in the panic handler. 118 */ 119 if (!oops_in_progress) { 120 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex)); 121 drm_WARN_ON(dev, !drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 122 } 123 124 125 drm_connector_list_iter_begin(dev, &conn_iter); 126 drm_for_each_connector_iter(connector, &conn_iter) { 127 if (connector->encoder == encoder) { 128 drm_connector_list_iter_end(&conn_iter); 129 return true; 130 } 131 } 132 drm_connector_list_iter_end(&conn_iter); 133 return false; 134} 135EXPORT_SYMBOL(drm_helper_encoder_in_use); 136 137/** 138 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 139 * @crtc: CRTC to check 140 * 141 * Checks whether @crtc is with the current mode setting output configuration 142 * in use by any connector. This doesn't mean that it is actually enabled since 143 * the DPMS state is tracked separately. 144 * 145 * Returns: 146 * True if @crtc is used, false otherwise. 147 */ 148bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 149{ 150 struct drm_encoder *encoder; 151 struct drm_device *dev = crtc->dev; 152 153 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev)); 154 155 /* 156 * We can expect this mutex to be locked if we are not panicking. 157 * Locking is currently fubar in the panic handler. 158 */ 159 if (!oops_in_progress) 160 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex)); 161 162 drm_for_each_encoder(encoder, dev) 163 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 164 return true; 165 return false; 166} 167EXPORT_SYMBOL(drm_helper_crtc_in_use); 168 169static void 170drm_encoder_disable(struct drm_encoder *encoder) 171{ 172 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 173 174 if (!encoder_funcs) 175 return; 176 177 if (encoder_funcs->disable) 178 (*encoder_funcs->disable)(encoder); 179 else if (encoder_funcs->dpms) 180 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 181} 182 183static void __drm_helper_disable_unused_functions(struct drm_device *dev) 184{ 185 struct drm_encoder *encoder; 186 struct drm_crtc *crtc; 187 188 drm_warn_on_modeset_not_all_locked(dev); 189 190 drm_for_each_encoder(encoder, dev) { 191 if (!drm_helper_encoder_in_use(encoder)) { 192 drm_encoder_disable(encoder); 193 /* disconnect encoder from any connector */ 194 encoder->crtc = NULL; 195 } 196 } 197 198 drm_for_each_crtc(crtc, dev) { 199 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 200 201 crtc->enabled = drm_helper_crtc_in_use(crtc); 202 if (!crtc->enabled) { 203 if (crtc_funcs->disable) 204 (*crtc_funcs->disable)(crtc); 205 else 206 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 207 crtc->primary->fb = NULL; 208 } 209 } 210} 211 212/** 213 * drm_helper_disable_unused_functions - disable unused objects 214 * @dev: DRM device 215 * 216 * This function walks through the entire mode setting configuration of @dev. It 217 * will remove any CRTC links of unused encoders and encoder links of 218 * disconnected connectors. Then it will disable all unused encoders and CRTCs 219 * either by calling their disable callback if available or by calling their 220 * dpms callback with DRM_MODE_DPMS_OFF. 221 * 222 * NOTE: 223 * 224 * This function is part of the legacy modeset helper library and will cause 225 * major confusion with atomic drivers. This is because atomic helpers guarantee 226 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 227 * on an enabled functions. drm_helper_disable_unused_functions() on the other 228 * hand throws such guarantees into the wind and calls disable hooks 229 * unconditionally on unused functions. 230 */ 231void drm_helper_disable_unused_functions(struct drm_device *dev) 232{ 233 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev)); 234 235 drm_modeset_lock_all(dev); 236 __drm_helper_disable_unused_functions(dev); 237 drm_modeset_unlock_all(dev); 238} 239EXPORT_SYMBOL(drm_helper_disable_unused_functions); 240 241/* 242 * Check the CRTC we're going to map each output to vs. its current 243 * CRTC. If they don't match, we have to disable the output and the CRTC 244 * since the driver will have to re-route things. 245 */ 246static void 247drm_crtc_prepare_encoders(struct drm_device *dev) 248{ 249 const struct drm_encoder_helper_funcs *encoder_funcs; 250 struct drm_encoder *encoder; 251 252 drm_for_each_encoder(encoder, dev) { 253 encoder_funcs = encoder->helper_private; 254 if (!encoder_funcs) 255 continue; 256 257 /* Disable unused encoders */ 258 if (encoder->crtc == NULL) 259 drm_encoder_disable(encoder); 260 } 261} 262 263/** 264 * drm_crtc_helper_set_mode - internal helper to set a mode 265 * @crtc: CRTC to program 266 * @mode: mode to use 267 * @x: horizontal offset into the surface 268 * @y: vertical offset into the surface 269 * @old_fb: old framebuffer, for cleanup 270 * 271 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 272 * to fixup or reject the mode prior to trying to set it. This is an internal 273 * helper that drivers could e.g. use to update properties that require the 274 * entire output pipe to be disabled and re-enabled in a new configuration. For 275 * example for changing whether audio is enabled on a hdmi link or for changing 276 * panel fitter or dither attributes. It is also called by the 277 * drm_crtc_helper_set_config() helper function to drive the mode setting 278 * sequence. 279 * 280 * Returns: 281 * True if the mode was set successfully, false otherwise. 282 */ 283bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 284 struct drm_display_mode *mode, 285 int x, int y, 286 struct drm_framebuffer *old_fb) 287{ 288 struct drm_device *dev = crtc->dev; 289 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 290 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 291 const struct drm_encoder_helper_funcs *encoder_funcs; 292 int saved_x, saved_y; 293 bool saved_enabled; 294 struct drm_encoder *encoder; 295 bool ret = true; 296 297 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev)); 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 drm_mode_init(&saved_mode, &crtc->mode); 313 drm_mode_init(&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 drm_mode_copy(&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 encoder_funcs = encoder->helper_private; 334 if (!encoder_funcs) 335 continue; 336 337 if (encoder_funcs->mode_fixup) { 338 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 339 adjusted_mode))) { 340 drm_dbg_kms(dev, "[ENCODER:%d:%s] mode fixup failed\n", 341 encoder->base.id, encoder->name); 342 goto done; 343 } 344 } 345 } 346 347 if (crtc_funcs->mode_fixup) { 348 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 349 adjusted_mode))) { 350 drm_dbg_kms(dev, "[CRTC:%d:%s] mode fixup failed\n", 351 crtc->base.id, crtc->name); 352 goto done; 353 } 354 } 355 drm_dbg_kms(dev, "[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 356 357 drm_mode_copy(&crtc->hwmode, adjusted_mode); 358 359 /* Prepare the encoders and CRTCs before setting the mode. */ 360 drm_for_each_encoder(encoder, dev) { 361 362 if (encoder->crtc != crtc) 363 continue; 364 365 encoder_funcs = encoder->helper_private; 366 if (!encoder_funcs) 367 continue; 368 369 /* Disable the encoders as the first thing we do. */ 370 if (encoder_funcs->prepare) 371 encoder_funcs->prepare(encoder); 372 } 373 374 drm_crtc_prepare_encoders(dev); 375 376 crtc_funcs->prepare(crtc); 377 378 /* Set up the DPLL and any encoders state that needs to adjust or depend 379 * on the DPLL. 380 */ 381 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 382 if (!ret) 383 goto done; 384 385 drm_for_each_encoder(encoder, dev) { 386 387 if (encoder->crtc != crtc) 388 continue; 389 390 encoder_funcs = encoder->helper_private; 391 if (!encoder_funcs) 392 continue; 393 394 drm_dbg_kms(dev, "[ENCODER:%d:%s] set [MODE:%s]\n", 395 encoder->base.id, encoder->name, mode->name); 396 if (encoder_funcs->mode_set) 397 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 398 } 399 400 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 401 crtc_funcs->commit(crtc); 402 403 drm_for_each_encoder(encoder, dev) { 404 405 if (encoder->crtc != crtc) 406 continue; 407 408 encoder_funcs = encoder->helper_private; 409 if (!encoder_funcs) 410 continue; 411 412 if (encoder_funcs->commit) 413 encoder_funcs->commit(encoder); 414 } 415 416 /* Calculate and store various constants which 417 * are later needed by vblank and swap-completion 418 * timestamping. They are derived from true hwmode. 419 */ 420 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 421 422 /* FIXME: add subpixel order */ 423done: 424 drm_mode_destroy(dev, adjusted_mode); 425 if (!ret) { 426 crtc->enabled = saved_enabled; 427 drm_mode_copy(&crtc->mode, &saved_mode); 428 drm_mode_copy(&crtc->hwmode, &saved_hwmode); 429 crtc->x = saved_x; 430 crtc->y = saved_y; 431 } 432 433 return ret; 434} 435EXPORT_SYMBOL(drm_crtc_helper_set_mode); 436 437/** 438 * drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state 439 * @crtc: CRTC to check 440 * @state: atomic state object 441 * 442 * Provides a default CRTC-state check handler for CRTCs that only have 443 * one primary plane attached to it. This is often the case for the CRTC 444 * of simple framebuffers. 445 * 446 * RETURNS: 447 * Zero on success, or an errno code otherwise. 448 */ 449int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state) 450{ 451 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 452 453 if (!new_crtc_state->enable) 454 return 0; 455 456 return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state); 457} 458EXPORT_SYMBOL(drm_crtc_helper_atomic_check); 459 460static void 461drm_crtc_helper_disable(struct drm_crtc *crtc) 462{ 463 struct drm_device *dev = crtc->dev; 464 struct drm_connector *connector; 465 struct drm_encoder *encoder; 466 467 /* Decouple all encoders and their attached connectors from this crtc */ 468 drm_for_each_encoder(encoder, dev) { 469 struct drm_connector_list_iter conn_iter; 470 471 if (encoder->crtc != crtc) 472 continue; 473 474 drm_connector_list_iter_begin(dev, &conn_iter); 475 drm_for_each_connector_iter(connector, &conn_iter) { 476 if (connector->encoder != encoder) 477 continue; 478 479 connector->encoder = NULL; 480 481 /* 482 * drm_helper_disable_unused_functions() ought to be 483 * doing this, but since we've decoupled the encoder 484 * from the connector above, the required connection 485 * between them is henceforth no longer available. 486 */ 487 connector->dpms = DRM_MODE_DPMS_OFF; 488 489 /* we keep a reference while the encoder is bound */ 490 drm_connector_put(connector); 491 } 492 drm_connector_list_iter_end(&conn_iter); 493 } 494 495 __drm_helper_disable_unused_functions(dev); 496} 497 498/* 499 * For connectors that support multiple encoders, either the 500 * .atomic_best_encoder() or .best_encoder() operation must be implemented. 501 */ 502struct drm_encoder * 503drm_connector_get_single_encoder(struct drm_connector *connector) 504{ 505 struct drm_encoder *encoder; 506 507 drm_WARN_ON(connector->dev, hweight32(connector->possible_encoders) > 1); 508 drm_connector_for_each_possible_encoder(connector, encoder) 509 return encoder; 510 511 return NULL; 512} 513 514/** 515 * drm_crtc_helper_set_config - set a new config from userspace 516 * @set: mode set configuration 517 * @ctx: lock acquire context, not used here 518 * 519 * The drm_crtc_helper_set_config() helper function implements the of 520 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 521 * helpers. 522 * 523 * It first tries to locate the best encoder for each connector by calling the 524 * connector @drm_connector_helper_funcs.best_encoder helper operation. 525 * 526 * After locating the appropriate encoders, the helper function will call the 527 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 528 * or reject it completely in which case an error will be returned to the 529 * application. If the new configuration after mode adjustment is identical to 530 * the current configuration the helper function will return without performing 531 * any other operation. 532 * 533 * If the adjusted mode is identical to the current mode but changes to the 534 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 535 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 536 * 537 * If the adjusted mode differs from the current mode, or if the 538 * ->mode_set_base() helper operation is not provided, the helper function 539 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 540 * and ->commit() CRTC and encoder helper operations, in that order. 541 * Alternatively it can also use the dpms and disable helper operations. For 542 * details see &struct drm_crtc_helper_funcs and struct 543 * &drm_encoder_helper_funcs. 544 * 545 * This function is deprecated. New drivers must implement atomic modeset 546 * support, for which this function is unsuitable. Instead drivers should use 547 * drm_atomic_helper_set_config(). 548 * 549 * Returns: 550 * Returns 0 on success, negative errno numbers on failure. 551 */ 552int drm_crtc_helper_set_config(struct drm_mode_set *set, 553 struct drm_modeset_acquire_ctx *ctx) 554{ 555 struct drm_device *dev; 556 struct drm_crtc **save_encoder_crtcs, *new_crtc; 557 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 558 bool mode_changed = false; /* if true do a full mode set */ 559 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 560 struct drm_connector *connector; 561 struct drm_connector_list_iter conn_iter; 562 int count = 0, ro, fail = 0; 563 const struct drm_crtc_helper_funcs *crtc_funcs; 564 struct drm_mode_set save_set; 565 int ret; 566 int i; 567 568 BUG_ON(!set); 569 BUG_ON(!set->crtc); 570 BUG_ON(!set->crtc->helper_private); 571 572 /* Enforce sane interface api - has been abused by the fb helper. */ 573 BUG_ON(!set->mode && set->fb); 574 BUG_ON(set->fb && set->num_connectors == 0); 575 576 crtc_funcs = set->crtc->helper_private; 577 578 dev = set->crtc->dev; 579 580 drm_dbg_kms(dev, "\n"); 581 582 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev)); 583 584 if (!set->mode) 585 set->fb = NULL; 586 587 if (set->fb) { 588 drm_dbg_kms(dev, "[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 589 set->crtc->base.id, set->crtc->name, 590 set->fb->base.id, 591 (int)set->num_connectors, set->x, set->y); 592 } else { 593 drm_dbg_kms(dev, "[CRTC:%d:%s] [NOFB]\n", 594 set->crtc->base.id, set->crtc->name); 595 drm_crtc_helper_disable(set->crtc); 596 return 0; 597 } 598 599 drm_warn_on_modeset_not_all_locked(dev); 600 601 /* 602 * Allocate space for the backup of all (non-pointer) encoder and 603 * connector data. 604 */ 605 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder, 606 sizeof(struct drm_crtc *), GFP_KERNEL); 607 if (!save_encoder_crtcs) 608 return -ENOMEM; 609 610 save_connector_encoders = kcalloc(dev->mode_config.num_connector, 611 sizeof(struct drm_encoder *), GFP_KERNEL); 612 if (!save_connector_encoders) { 613 kfree(save_encoder_crtcs); 614 return -ENOMEM; 615 } 616 617 /* 618 * Copy data. Note that driver private data is not affected. 619 * Should anything bad happen only the expected state is 620 * restored, not the drivers personal bookkeeping. 621 */ 622 count = 0; 623 drm_for_each_encoder(encoder, dev) { 624 save_encoder_crtcs[count++] = encoder->crtc; 625 } 626 627 count = 0; 628 drm_connector_list_iter_begin(dev, &conn_iter); 629 drm_for_each_connector_iter(connector, &conn_iter) 630 save_connector_encoders[count++] = connector->encoder; 631 drm_connector_list_iter_end(&conn_iter); 632 633 save_set.crtc = set->crtc; 634 save_set.mode = &set->crtc->mode; 635 save_set.x = set->crtc->x; 636 save_set.y = set->crtc->y; 637 save_set.fb = set->crtc->primary->fb; 638 639 /* We should be able to check here if the fb has the same properties 640 * and then just flip_or_move it */ 641 if (set->crtc->primary->fb != set->fb) { 642 /* If we have no fb then treat it as a full mode set */ 643 if (set->crtc->primary->fb == NULL) { 644 drm_dbg_kms(dev, "[CRTC:%d:%s] no fb, full mode set\n", 645 set->crtc->base.id, set->crtc->name); 646 mode_changed = true; 647 } else if (set->fb->format != set->crtc->primary->fb->format) { 648 mode_changed = true; 649 } else 650 fb_changed = true; 651 } 652 653 if (set->x != set->crtc->x || set->y != set->crtc->y) 654 fb_changed = true; 655 656 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 657 drm_dbg_kms(dev, "[CRTC:%d:%s] modes are different, full mode set:\n", 658 set->crtc->base.id, set->crtc->name); 659 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(&set->crtc->mode)); 660 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(set->mode)); 661 mode_changed = true; 662 } 663 664 /* take a reference on all unbound connectors in set, reuse the 665 * already taken reference for bound connectors 666 */ 667 for (ro = 0; ro < set->num_connectors; ro++) { 668 if (set->connectors[ro]->encoder) 669 continue; 670 drm_connector_get(set->connectors[ro]); 671 } 672 673 /* a) traverse passed in connector list and get encoders for them */ 674 count = 0; 675 drm_connector_list_iter_begin(dev, &conn_iter); 676 drm_for_each_connector_iter(connector, &conn_iter) { 677 const struct drm_connector_helper_funcs *connector_funcs = 678 connector->helper_private; 679 new_encoder = connector->encoder; 680 for (ro = 0; ro < set->num_connectors; ro++) { 681 if (set->connectors[ro] == connector) { 682 if (connector_funcs->best_encoder) 683 new_encoder = connector_funcs->best_encoder(connector); 684 else 685 new_encoder = drm_connector_get_single_encoder(connector); 686 687 /* if we can't get an encoder for a connector 688 we are setting now - then fail */ 689 if (new_encoder == NULL) 690 /* don't break so fail path works correct */ 691 fail = 1; 692 693 if (connector->dpms != DRM_MODE_DPMS_ON) { 694 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] DPMS not on, full mode switch\n", 695 connector->base.id, connector->name); 696 mode_changed = true; 697 } 698 699 break; 700 } 701 } 702 703 if (new_encoder != connector->encoder) { 704 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] encoder changed, full mode switch\n", 705 connector->base.id, connector->name); 706 mode_changed = true; 707 /* If the encoder is reused for another connector, then 708 * the appropriate crtc will be set later. 709 */ 710 if (connector->encoder) 711 connector->encoder->crtc = NULL; 712 connector->encoder = new_encoder; 713 } 714 } 715 drm_connector_list_iter_end(&conn_iter); 716 717 if (fail) { 718 ret = -EINVAL; 719 goto fail; 720 } 721 722 count = 0; 723 drm_connector_list_iter_begin(dev, &conn_iter); 724 drm_for_each_connector_iter(connector, &conn_iter) { 725 if (!connector->encoder) 726 continue; 727 728 if (connector->encoder->crtc == set->crtc) 729 new_crtc = NULL; 730 else 731 new_crtc = connector->encoder->crtc; 732 733 for (ro = 0; ro < set->num_connectors; ro++) { 734 if (set->connectors[ro] == connector) 735 new_crtc = set->crtc; 736 } 737 738 /* Make sure the new CRTC will work with the encoder */ 739 if (new_crtc && 740 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 741 ret = -EINVAL; 742 drm_connector_list_iter_end(&conn_iter); 743 goto fail; 744 } 745 if (new_crtc != connector->encoder->crtc) { 746 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] CRTC changed, full mode switch\n", 747 connector->base.id, connector->name); 748 mode_changed = true; 749 connector->encoder->crtc = new_crtc; 750 } 751 if (new_crtc) { 752 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 753 connector->base.id, connector->name, 754 new_crtc->base.id, new_crtc->name); 755 } else { 756 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [NOCRTC]\n", 757 connector->base.id, connector->name); 758 } 759 } 760 drm_connector_list_iter_end(&conn_iter); 761 762 /* mode_set_base is not a required function */ 763 if (fb_changed && !crtc_funcs->mode_set_base) 764 mode_changed = true; 765 766 if (mode_changed) { 767 if (drm_helper_crtc_in_use(set->crtc)) { 768 drm_dbg_kms(dev, "[CRTC:%d:%s] attempting to set mode from userspace: " DRM_MODE_FMT "\n", 769 set->crtc->base.id, set->crtc->name, DRM_MODE_ARG(set->mode)); 770 set->crtc->primary->fb = set->fb; 771 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 772 set->x, set->y, 773 save_set.fb)) { 774 drm_err(dev, "[CRTC:%d:%s] failed to set mode\n", 775 set->crtc->base.id, set->crtc->name); 776 set->crtc->primary->fb = save_set.fb; 777 ret = -EINVAL; 778 goto fail; 779 } 780 drm_dbg_kms(dev, "[CRTC:%d:%s] Setting connector DPMS state to on\n", 781 set->crtc->base.id, set->crtc->name); 782 for (i = 0; i < set->num_connectors; i++) { 783 drm_dbg_kms(dev, "\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 784 set->connectors[i]->name); 785 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 786 } 787 } 788 __drm_helper_disable_unused_functions(dev); 789 } else if (fb_changed) { 790 set->crtc->x = set->x; 791 set->crtc->y = set->y; 792 set->crtc->primary->fb = set->fb; 793 ret = crtc_funcs->mode_set_base(set->crtc, 794 set->x, set->y, save_set.fb); 795 if (ret != 0) { 796 set->crtc->x = save_set.x; 797 set->crtc->y = save_set.y; 798 set->crtc->primary->fb = save_set.fb; 799 goto fail; 800 } 801 } 802 803 kfree(save_connector_encoders); 804 kfree(save_encoder_crtcs); 805 return 0; 806 807fail: 808 /* Restore all previous data. */ 809 count = 0; 810 drm_for_each_encoder(encoder, dev) { 811 encoder->crtc = save_encoder_crtcs[count++]; 812 } 813 814 count = 0; 815 drm_connector_list_iter_begin(dev, &conn_iter); 816 drm_for_each_connector_iter(connector, &conn_iter) 817 connector->encoder = save_connector_encoders[count++]; 818 drm_connector_list_iter_end(&conn_iter); 819 820 /* after fail drop reference on all unbound connectors in set, let 821 * bound connectors keep their reference 822 */ 823 for (ro = 0; ro < set->num_connectors; ro++) { 824 if (set->connectors[ro]->encoder) 825 continue; 826 drm_connector_put(set->connectors[ro]); 827 } 828 829 /* Try to restore the config */ 830 if (mode_changed && 831 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 832 save_set.y, save_set.fb)) 833 drm_err(dev, "failed to restore config after modeset failure\n"); 834 835 kfree(save_connector_encoders); 836 kfree(save_encoder_crtcs); 837 return ret; 838} 839EXPORT_SYMBOL(drm_crtc_helper_set_config); 840 841static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 842{ 843 int dpms = DRM_MODE_DPMS_OFF; 844 struct drm_connector *connector; 845 struct drm_connector_list_iter conn_iter; 846 struct drm_device *dev = encoder->dev; 847 848 drm_connector_list_iter_begin(dev, &conn_iter); 849 drm_for_each_connector_iter(connector, &conn_iter) 850 if (connector->encoder == encoder) 851 if (connector->dpms < dpms) 852 dpms = connector->dpms; 853 drm_connector_list_iter_end(&conn_iter); 854 855 return dpms; 856} 857 858/* Helper which handles bridge ordering around encoder dpms */ 859static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 860{ 861 const struct drm_encoder_helper_funcs *encoder_funcs; 862 863 encoder_funcs = encoder->helper_private; 864 if (!encoder_funcs) 865 return; 866 867 if (encoder_funcs->dpms) 868 encoder_funcs->dpms(encoder, mode); 869} 870 871static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 872{ 873 int dpms = DRM_MODE_DPMS_OFF; 874 struct drm_connector *connector; 875 struct drm_connector_list_iter conn_iter; 876 struct drm_device *dev = crtc->dev; 877 878 drm_connector_list_iter_begin(dev, &conn_iter); 879 drm_for_each_connector_iter(connector, &conn_iter) 880 if (connector->encoder && connector->encoder->crtc == crtc) 881 if (connector->dpms < dpms) 882 dpms = connector->dpms; 883 drm_connector_list_iter_end(&conn_iter); 884 885 return dpms; 886} 887 888/** 889 * drm_helper_connector_dpms() - connector dpms helper implementation 890 * @connector: affected connector 891 * @mode: DPMS mode 892 * 893 * The drm_helper_connector_dpms() helper function implements the 894 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 895 * helpers. 896 * 897 * This is the main helper function provided by the CRTC helper framework for 898 * implementing the DPMS connector attribute. It computes the new desired DPMS 899 * state for all encoders and CRTCs in the output mesh and calls the 900 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 901 * provided by the driver. 902 * 903 * This function is deprecated. New drivers must implement atomic modeset 904 * support, where DPMS is handled in the DRM core. 905 * 906 * Returns: 907 * Always returns 0. 908 */ 909int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 910{ 911 struct drm_encoder *encoder = connector->encoder; 912 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 913 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 914 915 drm_WARN_ON(connector->dev, drm_drv_uses_atomic_modeset(connector->dev)); 916 917 if (mode == connector->dpms) 918 return 0; 919 920 old_dpms = connector->dpms; 921 connector->dpms = mode; 922 923 if (encoder) 924 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 925 926 /* from off to on, do crtc then encoder */ 927 if (mode < old_dpms) { 928 if (crtc) { 929 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 930 931 if (crtc_funcs->dpms) 932 (*crtc_funcs->dpms) (crtc, 933 drm_helper_choose_crtc_dpms(crtc)); 934 } 935 if (encoder) 936 drm_helper_encoder_dpms(encoder, encoder_dpms); 937 } 938 939 /* from on to off, do encoder then crtc */ 940 if (mode > old_dpms) { 941 if (encoder) 942 drm_helper_encoder_dpms(encoder, encoder_dpms); 943 if (crtc) { 944 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 945 946 if (crtc_funcs->dpms) 947 (*crtc_funcs->dpms) (crtc, 948 drm_helper_choose_crtc_dpms(crtc)); 949 } 950 } 951 952 return 0; 953} 954EXPORT_SYMBOL(drm_helper_connector_dpms); 955 956/** 957 * drm_helper_resume_force_mode - force-restore mode setting configuration 958 * @dev: drm_device which should be restored 959 * 960 * Drivers which use the mode setting helpers can use this function to 961 * force-restore the mode setting configuration e.g. on resume or when something 962 * else might have trampled over the hw state (like some overzealous old BIOSen 963 * tended to do). 964 * 965 * This helper doesn't provide a error return value since restoring the old 966 * config should never fail due to resource allocation issues since the driver 967 * has successfully set the restored configuration already. Hence this should 968 * boil down to the equivalent of a few dpms on calls, which also don't provide 969 * an error code. 970 * 971 * Drivers where simply restoring an old configuration again might fail (e.g. 972 * due to slight differences in allocating shared resources when the 973 * configuration is restored in a different order than when userspace set it up) 974 * need to use their own restore logic. 975 * 976 * This function is deprecated. New drivers should implement atomic mode- 977 * setting and use the atomic suspend/resume helpers. 978 * 979 * See also: 980 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 981 */ 982void drm_helper_resume_force_mode(struct drm_device *dev) 983{ 984 struct drm_crtc *crtc; 985 struct drm_encoder *encoder; 986 const struct drm_crtc_helper_funcs *crtc_funcs; 987 int encoder_dpms; 988 bool ret; 989 990 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev)); 991 992 drm_modeset_lock_all(dev); 993 drm_for_each_crtc(crtc, dev) { 994 995 if (!crtc->enabled) 996 continue; 997 998 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 999 crtc->x, crtc->y, crtc->primary->fb); 1000 1001 /* Restoring the old config should never fail! */ 1002 if (ret == false) 1003 drm_err(dev, "failed to set mode on crtc %p\n", crtc); 1004 1005 /* Turn off outputs that were already powered off */ 1006 if (drm_helper_choose_crtc_dpms(crtc)) { 1007 drm_for_each_encoder(encoder, dev) { 1008 1009 if(encoder->crtc != crtc) 1010 continue; 1011 1012 encoder_dpms = drm_helper_choose_encoder_dpms( 1013 encoder); 1014 1015 drm_helper_encoder_dpms(encoder, encoder_dpms); 1016 } 1017 1018 crtc_funcs = crtc->helper_private; 1019 if (crtc_funcs->dpms) 1020 (*crtc_funcs->dpms) (crtc, 1021 drm_helper_choose_crtc_dpms(crtc)); 1022 } 1023 } 1024 1025 /* disable the unused connectors while restoring the modesetting */ 1026 __drm_helper_disable_unused_functions(dev); 1027 drm_modeset_unlock_all(dev); 1028} 1029EXPORT_SYMBOL(drm_helper_resume_force_mode); 1030 1031/** 1032 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs 1033 * @dev: DRM device whose CRTCs to turn off 1034 * 1035 * Drivers may want to call this on unload to ensure that all displays are 1036 * unlit and the GPU is in a consistent, low power state. Takes modeset locks. 1037 * 1038 * Note: This should only be used by non-atomic legacy drivers. For an atomic 1039 * version look at drm_atomic_helper_shutdown(). 1040 * 1041 * Returns: 1042 * Zero on success, error code on failure. 1043 */ 1044int drm_helper_force_disable_all(struct drm_device *dev) 1045{ 1046 struct drm_crtc *crtc; 1047 int ret = 0; 1048 1049 drm_modeset_lock_all(dev); 1050 drm_for_each_crtc(crtc, dev) 1051 if (crtc->enabled) { 1052 struct drm_mode_set set = { 1053 .crtc = crtc, 1054 }; 1055 1056 ret = drm_mode_set_config_internal(&set); 1057 if (ret) 1058 goto out; 1059 } 1060out: 1061 drm_modeset_unlock_all(dev); 1062 return ret; 1063} 1064EXPORT_SYMBOL(drm_helper_force_disable_all);
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