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 WARN_ON(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 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 121 WARN_ON(!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 WARN_ON(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 WARN_ON(!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 WARN_ON(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 WARN_ON(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 encoder_funcs = encoder->helper_private; 338 if (encoder_funcs->mode_fixup) { 339 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 340 adjusted_mode))) { 341 DRM_DEBUG_KMS("Encoder fixup failed\n"); 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_DEBUG_KMS("CRTC fixup failed\n"); 351 goto done; 352 } 353 } 354 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 355 356 drm_mode_copy(&crtc->hwmode, adjusted_mode); 357 358 /* Prepare the encoders and CRTCs before setting the mode. */ 359 drm_for_each_encoder(encoder, dev) { 360 361 if (encoder->crtc != crtc) 362 continue; 363 364 encoder_funcs = encoder->helper_private; 365 if (!encoder_funcs) 366 continue; 367 368 /* Disable the encoders as the first thing we do. */ 369 if (encoder_funcs->prepare) 370 encoder_funcs->prepare(encoder); 371 } 372 373 drm_crtc_prepare_encoders(dev); 374 375 crtc_funcs->prepare(crtc); 376 377 /* Set up the DPLL and any encoders state that needs to adjust or depend 378 * on the DPLL. 379 */ 380 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 381 if (!ret) 382 goto done; 383 384 drm_for_each_encoder(encoder, dev) { 385 386 if (encoder->crtc != crtc) 387 continue; 388 389 encoder_funcs = encoder->helper_private; 390 if (!encoder_funcs) 391 continue; 392 393 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n", 394 encoder->base.id, encoder->name, mode->name); 395 if (encoder_funcs->mode_set) 396 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 397 } 398 399 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 400 crtc_funcs->commit(crtc); 401 402 drm_for_each_encoder(encoder, dev) { 403 404 if (encoder->crtc != crtc) 405 continue; 406 407 encoder_funcs = encoder->helper_private; 408 if (!encoder_funcs) 409 continue; 410 411 if (encoder_funcs->commit) 412 encoder_funcs->commit(encoder); 413 } 414 415 /* Calculate and store various constants which 416 * are later needed by vblank and swap-completion 417 * timestamping. They are derived from true hwmode. 418 */ 419 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 420 421 /* FIXME: add subpixel order */ 422done: 423 drm_mode_destroy(dev, adjusted_mode); 424 if (!ret) { 425 crtc->enabled = saved_enabled; 426 drm_mode_copy(&crtc->mode, &saved_mode); 427 drm_mode_copy(&crtc->hwmode, &saved_hwmode); 428 crtc->x = saved_x; 429 crtc->y = saved_y; 430 } 431 432 return ret; 433} 434EXPORT_SYMBOL(drm_crtc_helper_set_mode); 435 436/** 437 * drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state 438 * @crtc: CRTC to check 439 * @state: atomic state object 440 * 441 * Provides a default CRTC-state check handler for CRTCs that only have 442 * one primary plane attached to it. 443 * 444 * This is often the case for the CRTC of simple framebuffers. See also 445 * drm_plane_helper_atomic_check() for the respective plane-state check 446 * helper function. 447 * 448 * RETURNS: 449 * Zero on success, or an errno code otherwise. 450 */ 451int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state) 452{ 453 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 454 455 if (!new_crtc_state->enable) 456 return 0; 457 458 return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state); 459} 460EXPORT_SYMBOL(drm_crtc_helper_atomic_check); 461 462static void 463drm_crtc_helper_disable(struct drm_crtc *crtc) 464{ 465 struct drm_device *dev = crtc->dev; 466 struct drm_connector *connector; 467 struct drm_encoder *encoder; 468 469 /* Decouple all encoders and their attached connectors from this crtc */ 470 drm_for_each_encoder(encoder, dev) { 471 struct drm_connector_list_iter conn_iter; 472 473 if (encoder->crtc != crtc) 474 continue; 475 476 drm_connector_list_iter_begin(dev, &conn_iter); 477 drm_for_each_connector_iter(connector, &conn_iter) { 478 if (connector->encoder != encoder) 479 continue; 480 481 connector->encoder = NULL; 482 483 /* 484 * drm_helper_disable_unused_functions() ought to be 485 * doing this, but since we've decoupled the encoder 486 * from the connector above, the required connection 487 * between them is henceforth no longer available. 488 */ 489 connector->dpms = DRM_MODE_DPMS_OFF; 490 491 /* we keep a reference while the encoder is bound */ 492 drm_connector_put(connector); 493 } 494 drm_connector_list_iter_end(&conn_iter); 495 } 496 497 __drm_helper_disable_unused_functions(dev); 498} 499 500/* 501 * For connectors that support multiple encoders, either the 502 * .atomic_best_encoder() or .best_encoder() operation must be implemented. 503 */ 504struct drm_encoder * 505drm_connector_get_single_encoder(struct drm_connector *connector) 506{ 507 struct drm_encoder *encoder; 508 509 WARN_ON(hweight32(connector->possible_encoders) > 1); 510 drm_connector_for_each_possible_encoder(connector, encoder) 511 return encoder; 512 513 return NULL; 514} 515 516/** 517 * drm_crtc_helper_set_config - set a new config from userspace 518 * @set: mode set configuration 519 * @ctx: lock acquire context, not used here 520 * 521 * The drm_crtc_helper_set_config() helper function implements the of 522 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 523 * helpers. 524 * 525 * It first tries to locate the best encoder for each connector by calling the 526 * connector @drm_connector_helper_funcs.best_encoder helper operation. 527 * 528 * After locating the appropriate encoders, the helper function will call the 529 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 530 * or reject it completely in which case an error will be returned to the 531 * application. If the new configuration after mode adjustment is identical to 532 * the current configuration the helper function will return without performing 533 * any other operation. 534 * 535 * If the adjusted mode is identical to the current mode but changes to the 536 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 537 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 538 * 539 * If the adjusted mode differs from the current mode, or if the 540 * ->mode_set_base() helper operation is not provided, the helper function 541 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 542 * and ->commit() CRTC and encoder helper operations, in that order. 543 * Alternatively it can also use the dpms and disable helper operations. For 544 * details see &struct drm_crtc_helper_funcs and struct 545 * &drm_encoder_helper_funcs. 546 * 547 * This function is deprecated. New drivers must implement atomic modeset 548 * support, for which this function is unsuitable. Instead drivers should use 549 * drm_atomic_helper_set_config(). 550 * 551 * Returns: 552 * Returns 0 on success, negative errno numbers on failure. 553 */ 554int drm_crtc_helper_set_config(struct drm_mode_set *set, 555 struct drm_modeset_acquire_ctx *ctx) 556{ 557 struct drm_device *dev; 558 struct drm_crtc **save_encoder_crtcs, *new_crtc; 559 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 560 bool mode_changed = false; /* if true do a full mode set */ 561 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 562 struct drm_connector *connector; 563 struct drm_connector_list_iter conn_iter; 564 int count = 0, ro, fail = 0; 565 const struct drm_crtc_helper_funcs *crtc_funcs; 566 struct drm_mode_set save_set; 567 int ret; 568 int i; 569 570 DRM_DEBUG_KMS("\n"); 571 572 BUG_ON(!set); 573 BUG_ON(!set->crtc); 574 BUG_ON(!set->crtc->helper_private); 575 576 /* Enforce sane interface api - has been abused by the fb helper. */ 577 BUG_ON(!set->mode && set->fb); 578 BUG_ON(set->fb && set->num_connectors == 0); 579 580 crtc_funcs = set->crtc->helper_private; 581 582 dev = set->crtc->dev; 583 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 584 585 if (!set->mode) 586 set->fb = NULL; 587 588 if (set->fb) { 589 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 590 set->crtc->base.id, set->crtc->name, 591 set->fb->base.id, 592 (int)set->num_connectors, set->x, set->y); 593 } else { 594 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 595 set->crtc->base.id, set->crtc->name); 596 drm_crtc_helper_disable(set->crtc); 597 return 0; 598 } 599 600 drm_warn_on_modeset_not_all_locked(dev); 601 602 /* 603 * Allocate space for the backup of all (non-pointer) encoder and 604 * connector data. 605 */ 606 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder, 607 sizeof(struct drm_crtc *), GFP_KERNEL); 608 if (!save_encoder_crtcs) 609 return -ENOMEM; 610 611 save_connector_encoders = kcalloc(dev->mode_config.num_connector, 612 sizeof(struct drm_encoder *), GFP_KERNEL); 613 if (!save_connector_encoders) { 614 kfree(save_encoder_crtcs); 615 return -ENOMEM; 616 } 617 618 /* 619 * Copy data. Note that driver private data is not affected. 620 * Should anything bad happen only the expected state is 621 * restored, not the drivers personal bookkeeping. 622 */ 623 count = 0; 624 drm_for_each_encoder(encoder, dev) { 625 save_encoder_crtcs[count++] = encoder->crtc; 626 } 627 628 count = 0; 629 drm_connector_list_iter_begin(dev, &conn_iter); 630 drm_for_each_connector_iter(connector, &conn_iter) 631 save_connector_encoders[count++] = connector->encoder; 632 drm_connector_list_iter_end(&conn_iter); 633 634 save_set.crtc = set->crtc; 635 save_set.mode = &set->crtc->mode; 636 save_set.x = set->crtc->x; 637 save_set.y = set->crtc->y; 638 save_set.fb = set->crtc->primary->fb; 639 640 /* We should be able to check here if the fb has the same properties 641 * and then just flip_or_move it */ 642 if (set->crtc->primary->fb != set->fb) { 643 /* If we have no fb then treat it as a full mode set */ 644 if (set->crtc->primary->fb == NULL) { 645 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 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_DEBUG_KMS("modes are different, full mode set\n"); 658 drm_mode_debug_printmodeline(&set->crtc->mode); 659 drm_mode_debug_printmodeline(set->mode); 660 mode_changed = true; 661 } 662 663 /* take a reference on all unbound connectors in set, reuse the 664 * already taken reference for bound connectors 665 */ 666 for (ro = 0; ro < set->num_connectors; ro++) { 667 if (set->connectors[ro]->encoder) 668 continue; 669 drm_connector_get(set->connectors[ro]); 670 } 671 672 /* a) traverse passed in connector list and get encoders for them */ 673 count = 0; 674 drm_connector_list_iter_begin(dev, &conn_iter); 675 drm_for_each_connector_iter(connector, &conn_iter) { 676 const struct drm_connector_helper_funcs *connector_funcs = 677 connector->helper_private; 678 new_encoder = connector->encoder; 679 for (ro = 0; ro < set->num_connectors; ro++) { 680 if (set->connectors[ro] == connector) { 681 if (connector_funcs->best_encoder) 682 new_encoder = connector_funcs->best_encoder(connector); 683 else 684 new_encoder = drm_connector_get_single_encoder(connector); 685 686 /* if we can't get an encoder for a connector 687 we are setting now - then fail */ 688 if (new_encoder == NULL) 689 /* don't break so fail path works correct */ 690 fail = 1; 691 692 if (connector->dpms != DRM_MODE_DPMS_ON) { 693 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 694 mode_changed = true; 695 } 696 697 break; 698 } 699 } 700 701 if (new_encoder != connector->encoder) { 702 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 703 mode_changed = true; 704 /* If the encoder is reused for another connector, then 705 * the appropriate crtc will be set later. 706 */ 707 if (connector->encoder) 708 connector->encoder->crtc = NULL; 709 connector->encoder = new_encoder; 710 } 711 } 712 drm_connector_list_iter_end(&conn_iter); 713 714 if (fail) { 715 ret = -EINVAL; 716 goto fail; 717 } 718 719 count = 0; 720 drm_connector_list_iter_begin(dev, &conn_iter); 721 drm_for_each_connector_iter(connector, &conn_iter) { 722 if (!connector->encoder) 723 continue; 724 725 if (connector->encoder->crtc == set->crtc) 726 new_crtc = NULL; 727 else 728 new_crtc = connector->encoder->crtc; 729 730 for (ro = 0; ro < set->num_connectors; ro++) { 731 if (set->connectors[ro] == connector) 732 new_crtc = set->crtc; 733 } 734 735 /* Make sure the new CRTC will work with the encoder */ 736 if (new_crtc && 737 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 738 ret = -EINVAL; 739 drm_connector_list_iter_end(&conn_iter); 740 goto fail; 741 } 742 if (new_crtc != connector->encoder->crtc) { 743 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 744 mode_changed = true; 745 connector->encoder->crtc = new_crtc; 746 } 747 if (new_crtc) { 748 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 749 connector->base.id, connector->name, 750 new_crtc->base.id, new_crtc->name); 751 } else { 752 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 753 connector->base.id, connector->name); 754 } 755 } 756 drm_connector_list_iter_end(&conn_iter); 757 758 /* mode_set_base is not a required function */ 759 if (fb_changed && !crtc_funcs->mode_set_base) 760 mode_changed = true; 761 762 if (mode_changed) { 763 if (drm_helper_crtc_in_use(set->crtc)) { 764 DRM_DEBUG_KMS("attempting to set mode from" 765 " userspace\n"); 766 drm_mode_debug_printmodeline(set->mode); 767 set->crtc->primary->fb = set->fb; 768 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 769 set->x, set->y, 770 save_set.fb)) { 771 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 772 set->crtc->base.id, set->crtc->name); 773 set->crtc->primary->fb = save_set.fb; 774 ret = -EINVAL; 775 goto fail; 776 } 777 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 778 for (i = 0; i < set->num_connectors; i++) { 779 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 780 set->connectors[i]->name); 781 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 782 } 783 } 784 __drm_helper_disable_unused_functions(dev); 785 } else if (fb_changed) { 786 set->crtc->x = set->x; 787 set->crtc->y = set->y; 788 set->crtc->primary->fb = set->fb; 789 ret = crtc_funcs->mode_set_base(set->crtc, 790 set->x, set->y, save_set.fb); 791 if (ret != 0) { 792 set->crtc->x = save_set.x; 793 set->crtc->y = save_set.y; 794 set->crtc->primary->fb = save_set.fb; 795 goto fail; 796 } 797 } 798 799 kfree(save_connector_encoders); 800 kfree(save_encoder_crtcs); 801 return 0; 802 803fail: 804 /* Restore all previous data. */ 805 count = 0; 806 drm_for_each_encoder(encoder, dev) { 807 encoder->crtc = save_encoder_crtcs[count++]; 808 } 809 810 count = 0; 811 drm_connector_list_iter_begin(dev, &conn_iter); 812 drm_for_each_connector_iter(connector, &conn_iter) 813 connector->encoder = save_connector_encoders[count++]; 814 drm_connector_list_iter_end(&conn_iter); 815 816 /* after fail drop reference on all unbound connectors in set, let 817 * bound connectors keep their reference 818 */ 819 for (ro = 0; ro < set->num_connectors; ro++) { 820 if (set->connectors[ro]->encoder) 821 continue; 822 drm_connector_put(set->connectors[ro]); 823 } 824 825 /* Try to restore the config */ 826 if (mode_changed && 827 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 828 save_set.y, save_set.fb)) 829 DRM_ERROR("failed to restore config after modeset failure\n"); 830 831 kfree(save_connector_encoders); 832 kfree(save_encoder_crtcs); 833 return ret; 834} 835EXPORT_SYMBOL(drm_crtc_helper_set_config); 836 837static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 838{ 839 int dpms = DRM_MODE_DPMS_OFF; 840 struct drm_connector *connector; 841 struct drm_connector_list_iter conn_iter; 842 struct drm_device *dev = encoder->dev; 843 844 drm_connector_list_iter_begin(dev, &conn_iter); 845 drm_for_each_connector_iter(connector, &conn_iter) 846 if (connector->encoder == encoder) 847 if (connector->dpms < dpms) 848 dpms = connector->dpms; 849 drm_connector_list_iter_end(&conn_iter); 850 851 return dpms; 852} 853 854/* Helper which handles bridge ordering around encoder dpms */ 855static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 856{ 857 const struct drm_encoder_helper_funcs *encoder_funcs; 858 859 encoder_funcs = encoder->helper_private; 860 if (!encoder_funcs) 861 return; 862 863 if (encoder_funcs->dpms) 864 encoder_funcs->dpms(encoder, mode); 865} 866 867static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 868{ 869 int dpms = DRM_MODE_DPMS_OFF; 870 struct drm_connector *connector; 871 struct drm_connector_list_iter conn_iter; 872 struct drm_device *dev = crtc->dev; 873 874 drm_connector_list_iter_begin(dev, &conn_iter); 875 drm_for_each_connector_iter(connector, &conn_iter) 876 if (connector->encoder && connector->encoder->crtc == crtc) 877 if (connector->dpms < dpms) 878 dpms = connector->dpms; 879 drm_connector_list_iter_end(&conn_iter); 880 881 return dpms; 882} 883 884/** 885 * drm_helper_connector_dpms() - connector dpms helper implementation 886 * @connector: affected connector 887 * @mode: DPMS mode 888 * 889 * The drm_helper_connector_dpms() helper function implements the 890 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 891 * helpers. 892 * 893 * This is the main helper function provided by the CRTC helper framework for 894 * implementing the DPMS connector attribute. It computes the new desired DPMS 895 * state for all encoders and CRTCs in the output mesh and calls the 896 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 897 * provided by the driver. 898 * 899 * This function is deprecated. New drivers must implement atomic modeset 900 * support, where DPMS is handled in the DRM core. 901 * 902 * Returns: 903 * Always returns 0. 904 */ 905int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 906{ 907 struct drm_encoder *encoder = connector->encoder; 908 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 909 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 910 911 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev)); 912 913 if (mode == connector->dpms) 914 return 0; 915 916 old_dpms = connector->dpms; 917 connector->dpms = mode; 918 919 if (encoder) 920 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 921 922 /* from off to on, do crtc then encoder */ 923 if (mode < old_dpms) { 924 if (crtc) { 925 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 926 927 if (crtc_funcs->dpms) 928 (*crtc_funcs->dpms) (crtc, 929 drm_helper_choose_crtc_dpms(crtc)); 930 } 931 if (encoder) 932 drm_helper_encoder_dpms(encoder, encoder_dpms); 933 } 934 935 /* from on to off, do encoder then crtc */ 936 if (mode > old_dpms) { 937 if (encoder) 938 drm_helper_encoder_dpms(encoder, encoder_dpms); 939 if (crtc) { 940 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 941 942 if (crtc_funcs->dpms) 943 (*crtc_funcs->dpms) (crtc, 944 drm_helper_choose_crtc_dpms(crtc)); 945 } 946 } 947 948 return 0; 949} 950EXPORT_SYMBOL(drm_helper_connector_dpms); 951 952/** 953 * drm_helper_resume_force_mode - force-restore mode setting configuration 954 * @dev: drm_device which should be restored 955 * 956 * Drivers which use the mode setting helpers can use this function to 957 * force-restore the mode setting configuration e.g. on resume or when something 958 * else might have trampled over the hw state (like some overzealous old BIOSen 959 * tended to do). 960 * 961 * This helper doesn't provide a error return value since restoring the old 962 * config should never fail due to resource allocation issues since the driver 963 * has successfully set the restored configuration already. Hence this should 964 * boil down to the equivalent of a few dpms on calls, which also don't provide 965 * an error code. 966 * 967 * Drivers where simply restoring an old configuration again might fail (e.g. 968 * due to slight differences in allocating shared resources when the 969 * configuration is restored in a different order than when userspace set it up) 970 * need to use their own restore logic. 971 * 972 * This function is deprecated. New drivers should implement atomic mode- 973 * setting and use the atomic suspend/resume helpers. 974 * 975 * See also: 976 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 977 */ 978void drm_helper_resume_force_mode(struct drm_device *dev) 979{ 980 struct drm_crtc *crtc; 981 struct drm_encoder *encoder; 982 const struct drm_crtc_helper_funcs *crtc_funcs; 983 int encoder_dpms; 984 bool ret; 985 986 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 987 988 drm_modeset_lock_all(dev); 989 drm_for_each_crtc(crtc, dev) { 990 991 if (!crtc->enabled) 992 continue; 993 994 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 995 crtc->x, crtc->y, crtc->primary->fb); 996 997 /* Restoring the old config should never fail! */ 998 if (ret == false) 999 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 1000 1001 /* Turn off outputs that were already powered off */ 1002 if (drm_helper_choose_crtc_dpms(crtc)) { 1003 drm_for_each_encoder(encoder, dev) { 1004 1005 if(encoder->crtc != crtc) 1006 continue; 1007 1008 encoder_dpms = drm_helper_choose_encoder_dpms( 1009 encoder); 1010 1011 drm_helper_encoder_dpms(encoder, encoder_dpms); 1012 } 1013 1014 crtc_funcs = crtc->helper_private; 1015 if (crtc_funcs->dpms) 1016 (*crtc_funcs->dpms) (crtc, 1017 drm_helper_choose_crtc_dpms(crtc)); 1018 } 1019 } 1020 1021 /* disable the unused connectors while restoring the modesetting */ 1022 __drm_helper_disable_unused_functions(dev); 1023 drm_modeset_unlock_all(dev); 1024} 1025EXPORT_SYMBOL(drm_helper_resume_force_mode); 1026 1027/** 1028 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs 1029 * @dev: DRM device whose CRTCs to turn off 1030 * 1031 * Drivers may want to call this on unload to ensure that all displays are 1032 * unlit and the GPU is in a consistent, low power state. Takes modeset locks. 1033 * 1034 * Note: This should only be used by non-atomic legacy drivers. For an atomic 1035 * version look at drm_atomic_helper_shutdown(). 1036 * 1037 * Returns: 1038 * Zero on success, error code on failure. 1039 */ 1040int drm_helper_force_disable_all(struct drm_device *dev) 1041{ 1042 struct drm_crtc *crtc; 1043 int ret = 0; 1044 1045 drm_modeset_lock_all(dev); 1046 drm_for_each_crtc(crtc, dev) 1047 if (crtc->enabled) { 1048 struct drm_mode_set set = { 1049 .crtc = crtc, 1050 }; 1051 1052 ret = drm_mode_set_config_internal(&set); 1053 if (ret) 1054 goto out; 1055 } 1056out: 1057 drm_modeset_unlock_all(dev); 1058 return ret; 1059} 1060EXPORT_SYMBOL(drm_helper_force_disable_all); 1061