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_fb_helper.h> 47 #include <drm/drm_fourcc.h> 48 #include <drm/drm_framebuffer.h> 49 #include <drm/drm_print.h> 50 #include <drm/drm_vblank.h> 51 52 #include "drm_crtc_helper_internal.h" 53 54 DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0, 55 "DRM_UT_CORE", 56 "DRM_UT_DRIVER", 57 "DRM_UT_KMS", 58 "DRM_UT_PRIME", 59 "DRM_UT_ATOMIC", 60 "DRM_UT_VBL", 61 "DRM_UT_STATE", 62 "DRM_UT_LEASE", 63 "DRM_UT_DP", 64 "DRM_UT_DRMRES"); 65 66 /** 67 * DOC: overview 68 * 69 * The CRTC modeset helper library provides a default set_config implementation 70 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 71 * the same callbacks which drivers can use to e.g. restore the modeset 72 * configuration on resume with drm_helper_resume_force_mode(). 73 * 74 * Note that this helper library doesn't track the current power state of CRTCs 75 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even 76 * though the hardware is already in the desired state. This deficiency has been 77 * fixed in the atomic helpers. 78 * 79 * The driver callbacks are mostly compatible with the atomic modeset helpers, 80 * except for the handling of the primary plane: Atomic helpers require that the 81 * primary plane is implemented as a real standalone plane and not directly tied 82 * to the CRTC state. For easier transition this library provides functions to 83 * implement the old semantics required by the CRTC helpers using the new plane 84 * and atomic helper callbacks. 85 * 86 * Drivers are strongly urged to convert to the atomic helpers (by way of first 87 * converting to the plane helpers). New drivers must not use these functions 88 * but need to implement the atomic interface instead, potentially using the 89 * atomic helpers for that. 90 * 91 * These legacy modeset helpers use the same function table structures as 92 * all other modesetting helpers. See the documentation for struct 93 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct 94 * &drm_connector_helper_funcs. 95 */ 96 97 /** 98 * drm_helper_encoder_in_use - check if a given encoder is in use 99 * @encoder: encoder to check 100 * 101 * Checks whether @encoder is with the current mode setting output configuration 102 * in use by any connector. This doesn't mean that it is actually enabled since 103 * the DPMS state is tracked separately. 104 * 105 * Returns: 106 * True if @encoder is used, false otherwise. 107 */ 108 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 109 { 110 struct drm_connector *connector; 111 struct drm_connector_list_iter conn_iter; 112 struct drm_device *dev = encoder->dev; 113 114 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 115 116 /* 117 * We can expect this mutex to be locked if we are not panicking. 118 * Locking is currently fubar in the panic handler. 119 */ 120 if (!oops_in_progress) { 121 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 122 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 123 } 124 125 126 drm_connector_list_iter_begin(dev, &conn_iter); 127 drm_for_each_connector_iter(connector, &conn_iter) { 128 if (connector->encoder == encoder) { 129 drm_connector_list_iter_end(&conn_iter); 130 return true; 131 } 132 } 133 drm_connector_list_iter_end(&conn_iter); 134 return false; 135 } 136 EXPORT_SYMBOL(drm_helper_encoder_in_use); 137 138 /** 139 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 140 * @crtc: CRTC to check 141 * 142 * Checks whether @crtc is with the current mode setting output configuration 143 * in use by any connector. This doesn't mean that it is actually enabled since 144 * the DPMS state is tracked separately. 145 * 146 * Returns: 147 * True if @crtc is used, false otherwise. 148 */ 149 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 150 { 151 struct drm_encoder *encoder; 152 struct drm_device *dev = crtc->dev; 153 154 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 155 156 /* 157 * We can expect this mutex to be locked if we are not panicking. 158 * Locking is currently fubar in the panic handler. 159 */ 160 if (!oops_in_progress) 161 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 162 163 drm_for_each_encoder(encoder, dev) 164 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 165 return true; 166 return false; 167 } 168 EXPORT_SYMBOL(drm_helper_crtc_in_use); 169 170 static void 171 drm_encoder_disable(struct drm_encoder *encoder) 172 { 173 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 174 175 if (!encoder_funcs) 176 return; 177 178 if (encoder_funcs->disable) 179 (*encoder_funcs->disable)(encoder); 180 else if (encoder_funcs->dpms) 181 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 182 } 183 184 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 185 { 186 struct drm_encoder *encoder; 187 struct drm_crtc *crtc; 188 189 drm_warn_on_modeset_not_all_locked(dev); 190 191 drm_for_each_encoder(encoder, dev) { 192 if (!drm_helper_encoder_in_use(encoder)) { 193 drm_encoder_disable(encoder); 194 /* disconnect encoder from any connector */ 195 encoder->crtc = NULL; 196 } 197 } 198 199 drm_for_each_crtc(crtc, dev) { 200 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 201 202 crtc->enabled = drm_helper_crtc_in_use(crtc); 203 if (!crtc->enabled) { 204 if (crtc_funcs->disable) 205 (*crtc_funcs->disable)(crtc); 206 else 207 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 208 crtc->primary->fb = NULL; 209 } 210 } 211 } 212 213 /** 214 * drm_helper_disable_unused_functions - disable unused objects 215 * @dev: DRM device 216 * 217 * This function walks through the entire mode setting configuration of @dev. It 218 * will remove any CRTC links of unused encoders and encoder links of 219 * disconnected connectors. Then it will disable all unused encoders and CRTCs 220 * either by calling their disable callback if available or by calling their 221 * dpms callback with DRM_MODE_DPMS_OFF. 222 * 223 * NOTE: 224 * 225 * This function is part of the legacy modeset helper library and will cause 226 * major confusion with atomic drivers. This is because atomic helpers guarantee 227 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 228 * on an enabled functions. drm_helper_disable_unused_functions() on the other 229 * hand throws such guarantees into the wind and calls disable hooks 230 * unconditionally on unused functions. 231 */ 232 void drm_helper_disable_unused_functions(struct drm_device *dev) 233 { 234 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 235 236 drm_modeset_lock_all(dev); 237 __drm_helper_disable_unused_functions(dev); 238 drm_modeset_unlock_all(dev); 239 } 240 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 241 242 /* 243 * Check the CRTC we're going to map each output to vs. its current 244 * CRTC. If they don't match, we have to disable the output and the CRTC 245 * since the driver will have to re-route things. 246 */ 247 static void 248 drm_crtc_prepare_encoders(struct drm_device *dev) 249 { 250 const struct drm_encoder_helper_funcs *encoder_funcs; 251 struct drm_encoder *encoder; 252 253 drm_for_each_encoder(encoder, dev) { 254 encoder_funcs = encoder->helper_private; 255 if (!encoder_funcs) 256 continue; 257 258 /* Disable unused encoders */ 259 if (encoder->crtc == NULL) 260 drm_encoder_disable(encoder); 261 } 262 } 263 264 /** 265 * drm_crtc_helper_set_mode - internal helper to set a mode 266 * @crtc: CRTC to program 267 * @mode: mode to use 268 * @x: horizontal offset into the surface 269 * @y: vertical offset into the surface 270 * @old_fb: old framebuffer, for cleanup 271 * 272 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 273 * to fixup or reject the mode prior to trying to set it. This is an internal 274 * helper that drivers could e.g. use to update properties that require the 275 * entire output pipe to be disabled and re-enabled in a new configuration. For 276 * example for changing whether audio is enabled on a hdmi link or for changing 277 * panel fitter or dither attributes. It is also called by the 278 * drm_crtc_helper_set_config() helper function to drive the mode setting 279 * sequence. 280 * 281 * Returns: 282 * True if the mode was set successfully, false otherwise. 283 */ 284 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 285 struct drm_display_mode *mode, 286 int x, int y, 287 struct drm_framebuffer *old_fb) 288 { 289 struct drm_device *dev = crtc->dev; 290 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 291 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 292 const struct drm_encoder_helper_funcs *encoder_funcs; 293 int saved_x, saved_y; 294 bool saved_enabled; 295 struct drm_encoder *encoder; 296 bool ret = true; 297 298 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 299 300 drm_warn_on_modeset_not_all_locked(dev); 301 302 saved_enabled = crtc->enabled; 303 crtc->enabled = drm_helper_crtc_in_use(crtc); 304 if (!crtc->enabled) 305 return true; 306 307 adjusted_mode = drm_mode_duplicate(dev, mode); 308 if (!adjusted_mode) { 309 crtc->enabled = saved_enabled; 310 return false; 311 } 312 313 drm_mode_init(&saved_mode, &crtc->mode); 314 drm_mode_init(&saved_hwmode, &crtc->hwmode); 315 saved_x = crtc->x; 316 saved_y = crtc->y; 317 318 /* Update crtc values up front so the driver can rely on them for mode 319 * setting. 320 */ 321 drm_mode_copy(&crtc->mode, mode); 322 crtc->x = x; 323 crtc->y = y; 324 325 /* Pass our mode to the connectors and the CRTC to give them a chance to 326 * adjust it according to limitations or connector properties, and also 327 * a chance to reject the mode entirely. 328 */ 329 drm_for_each_encoder(encoder, dev) { 330 331 if (encoder->crtc != crtc) 332 continue; 333 334 encoder_funcs = encoder->helper_private; 335 if (!encoder_funcs) 336 continue; 337 338 encoder_funcs = encoder->helper_private; 339 if (encoder_funcs->mode_fixup) { 340 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 341 adjusted_mode))) { 342 DRM_DEBUG_KMS("Encoder fixup failed\n"); 343 goto done; 344 } 345 } 346 } 347 348 if (crtc_funcs->mode_fixup) { 349 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 350 adjusted_mode))) { 351 DRM_DEBUG_KMS("CRTC fixup failed\n"); 352 goto done; 353 } 354 } 355 DRM_DEBUG_KMS("[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_DEBUG_KMS("[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 */ 423 done: 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 } 435 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 436 437 static void 438 drm_crtc_helper_disable(struct drm_crtc *crtc) 439 { 440 struct drm_device *dev = crtc->dev; 441 struct drm_connector *connector; 442 struct drm_encoder *encoder; 443 444 /* Decouple all encoders and their attached connectors from this crtc */ 445 drm_for_each_encoder(encoder, dev) { 446 struct drm_connector_list_iter conn_iter; 447 448 if (encoder->crtc != crtc) 449 continue; 450 451 drm_connector_list_iter_begin(dev, &conn_iter); 452 drm_for_each_connector_iter(connector, &conn_iter) { 453 if (connector->encoder != encoder) 454 continue; 455 456 connector->encoder = NULL; 457 458 /* 459 * drm_helper_disable_unused_functions() ought to be 460 * doing this, but since we've decoupled the encoder 461 * from the connector above, the required connection 462 * between them is henceforth no longer available. 463 */ 464 connector->dpms = DRM_MODE_DPMS_OFF; 465 466 /* we keep a reference while the encoder is bound */ 467 drm_connector_put(connector); 468 } 469 drm_connector_list_iter_end(&conn_iter); 470 } 471 472 __drm_helper_disable_unused_functions(dev); 473 } 474 475 /* 476 * For connectors that support multiple encoders, either the 477 * .atomic_best_encoder() or .best_encoder() operation must be implemented. 478 */ 479 struct drm_encoder * 480 drm_connector_get_single_encoder(struct drm_connector *connector) 481 { 482 struct drm_encoder *encoder; 483 484 WARN_ON(hweight32(connector->possible_encoders) > 1); 485 drm_connector_for_each_possible_encoder(connector, encoder) 486 return encoder; 487 488 return NULL; 489 } 490 491 /** 492 * drm_crtc_helper_set_config - set a new config from userspace 493 * @set: mode set configuration 494 * @ctx: lock acquire context, not used here 495 * 496 * The drm_crtc_helper_set_config() helper function implements the of 497 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 498 * helpers. 499 * 500 * It first tries to locate the best encoder for each connector by calling the 501 * connector @drm_connector_helper_funcs.best_encoder helper operation. 502 * 503 * After locating the appropriate encoders, the helper function will call the 504 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 505 * or reject it completely in which case an error will be returned to the 506 * application. If the new configuration after mode adjustment is identical to 507 * the current configuration the helper function will return without performing 508 * any other operation. 509 * 510 * If the adjusted mode is identical to the current mode but changes to the 511 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 512 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 513 * 514 * If the adjusted mode differs from the current mode, or if the 515 * ->mode_set_base() helper operation is not provided, the helper function 516 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 517 * and ->commit() CRTC and encoder helper operations, in that order. 518 * Alternatively it can also use the dpms and disable helper operations. For 519 * details see &struct drm_crtc_helper_funcs and struct 520 * &drm_encoder_helper_funcs. 521 * 522 * This function is deprecated. New drivers must implement atomic modeset 523 * support, for which this function is unsuitable. Instead drivers should use 524 * drm_atomic_helper_set_config(). 525 * 526 * Returns: 527 * Returns 0 on success, negative errno numbers on failure. 528 */ 529 int drm_crtc_helper_set_config(struct drm_mode_set *set, 530 struct drm_modeset_acquire_ctx *ctx) 531 { 532 struct drm_device *dev; 533 struct drm_crtc **save_encoder_crtcs, *new_crtc; 534 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 535 bool mode_changed = false; /* if true do a full mode set */ 536 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 537 struct drm_connector *connector; 538 struct drm_connector_list_iter conn_iter; 539 int count = 0, ro, fail = 0; 540 const struct drm_crtc_helper_funcs *crtc_funcs; 541 struct drm_mode_set save_set; 542 int ret; 543 int i; 544 545 DRM_DEBUG_KMS("\n"); 546 547 BUG_ON(!set); 548 BUG_ON(!set->crtc); 549 BUG_ON(!set->crtc->helper_private); 550 551 /* Enforce sane interface api - has been abused by the fb helper. */ 552 BUG_ON(!set->mode && set->fb); 553 BUG_ON(set->fb && set->num_connectors == 0); 554 555 crtc_funcs = set->crtc->helper_private; 556 557 dev = set->crtc->dev; 558 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 559 560 if (!set->mode) 561 set->fb = NULL; 562 563 if (set->fb) { 564 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 565 set->crtc->base.id, set->crtc->name, 566 set->fb->base.id, 567 (int)set->num_connectors, set->x, set->y); 568 } else { 569 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 570 set->crtc->base.id, set->crtc->name); 571 drm_crtc_helper_disable(set->crtc); 572 return 0; 573 } 574 575 drm_warn_on_modeset_not_all_locked(dev); 576 577 /* 578 * Allocate space for the backup of all (non-pointer) encoder and 579 * connector data. 580 */ 581 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder, 582 sizeof(struct drm_crtc *), GFP_KERNEL); 583 if (!save_encoder_crtcs) 584 return -ENOMEM; 585 586 save_connector_encoders = kcalloc(dev->mode_config.num_connector, 587 sizeof(struct drm_encoder *), GFP_KERNEL); 588 if (!save_connector_encoders) { 589 kfree(save_encoder_crtcs); 590 return -ENOMEM; 591 } 592 593 /* 594 * Copy data. Note that driver private data is not affected. 595 * Should anything bad happen only the expected state is 596 * restored, not the drivers personal bookkeeping. 597 */ 598 count = 0; 599 drm_for_each_encoder(encoder, dev) { 600 save_encoder_crtcs[count++] = encoder->crtc; 601 } 602 603 count = 0; 604 drm_connector_list_iter_begin(dev, &conn_iter); 605 drm_for_each_connector_iter(connector, &conn_iter) 606 save_connector_encoders[count++] = connector->encoder; 607 drm_connector_list_iter_end(&conn_iter); 608 609 save_set.crtc = set->crtc; 610 save_set.mode = &set->crtc->mode; 611 save_set.x = set->crtc->x; 612 save_set.y = set->crtc->y; 613 save_set.fb = set->crtc->primary->fb; 614 615 /* We should be able to check here if the fb has the same properties 616 * and then just flip_or_move it */ 617 if (set->crtc->primary->fb != set->fb) { 618 /* If we have no fb then treat it as a full mode set */ 619 if (set->crtc->primary->fb == NULL) { 620 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 621 mode_changed = true; 622 } else if (set->fb->format != set->crtc->primary->fb->format) { 623 mode_changed = true; 624 } else 625 fb_changed = true; 626 } 627 628 if (set->x != set->crtc->x || set->y != set->crtc->y) 629 fb_changed = true; 630 631 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 632 DRM_DEBUG_KMS("modes are different, full mode set\n"); 633 drm_mode_debug_printmodeline(&set->crtc->mode); 634 drm_mode_debug_printmodeline(set->mode); 635 mode_changed = true; 636 } 637 638 /* take a reference on all unbound connectors in set, reuse the 639 * already taken reference for bound connectors 640 */ 641 for (ro = 0; ro < set->num_connectors; ro++) { 642 if (set->connectors[ro]->encoder) 643 continue; 644 drm_connector_get(set->connectors[ro]); 645 } 646 647 /* a) traverse passed in connector list and get encoders for them */ 648 count = 0; 649 drm_connector_list_iter_begin(dev, &conn_iter); 650 drm_for_each_connector_iter(connector, &conn_iter) { 651 const struct drm_connector_helper_funcs *connector_funcs = 652 connector->helper_private; 653 new_encoder = connector->encoder; 654 for (ro = 0; ro < set->num_connectors; ro++) { 655 if (set->connectors[ro] == connector) { 656 if (connector_funcs->best_encoder) 657 new_encoder = connector_funcs->best_encoder(connector); 658 else 659 new_encoder = drm_connector_get_single_encoder(connector); 660 661 /* if we can't get an encoder for a connector 662 we are setting now - then fail */ 663 if (new_encoder == NULL) 664 /* don't break so fail path works correct */ 665 fail = 1; 666 667 if (connector->dpms != DRM_MODE_DPMS_ON) { 668 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 669 mode_changed = true; 670 } 671 672 break; 673 } 674 } 675 676 if (new_encoder != connector->encoder) { 677 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 678 mode_changed = true; 679 /* If the encoder is reused for another connector, then 680 * the appropriate crtc will be set later. 681 */ 682 if (connector->encoder) 683 connector->encoder->crtc = NULL; 684 connector->encoder = new_encoder; 685 } 686 } 687 drm_connector_list_iter_end(&conn_iter); 688 689 if (fail) { 690 ret = -EINVAL; 691 goto fail; 692 } 693 694 count = 0; 695 drm_connector_list_iter_begin(dev, &conn_iter); 696 drm_for_each_connector_iter(connector, &conn_iter) { 697 if (!connector->encoder) 698 continue; 699 700 if (connector->encoder->crtc == set->crtc) 701 new_crtc = NULL; 702 else 703 new_crtc = connector->encoder->crtc; 704 705 for (ro = 0; ro < set->num_connectors; ro++) { 706 if (set->connectors[ro] == connector) 707 new_crtc = set->crtc; 708 } 709 710 /* Make sure the new CRTC will work with the encoder */ 711 if (new_crtc && 712 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 713 ret = -EINVAL; 714 drm_connector_list_iter_end(&conn_iter); 715 goto fail; 716 } 717 if (new_crtc != connector->encoder->crtc) { 718 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 719 mode_changed = true; 720 connector->encoder->crtc = new_crtc; 721 } 722 if (new_crtc) { 723 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 724 connector->base.id, connector->name, 725 new_crtc->base.id, new_crtc->name); 726 } else { 727 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 728 connector->base.id, connector->name); 729 } 730 } 731 drm_connector_list_iter_end(&conn_iter); 732 733 /* mode_set_base is not a required function */ 734 if (fb_changed && !crtc_funcs->mode_set_base) 735 mode_changed = true; 736 737 if (mode_changed) { 738 if (drm_helper_crtc_in_use(set->crtc)) { 739 DRM_DEBUG_KMS("attempting to set mode from" 740 " userspace\n"); 741 drm_mode_debug_printmodeline(set->mode); 742 set->crtc->primary->fb = set->fb; 743 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 744 set->x, set->y, 745 save_set.fb)) { 746 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 747 set->crtc->base.id, set->crtc->name); 748 set->crtc->primary->fb = save_set.fb; 749 ret = -EINVAL; 750 goto fail; 751 } 752 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 753 for (i = 0; i < set->num_connectors; i++) { 754 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 755 set->connectors[i]->name); 756 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 757 } 758 } 759 __drm_helper_disable_unused_functions(dev); 760 } else if (fb_changed) { 761 set->crtc->x = set->x; 762 set->crtc->y = set->y; 763 set->crtc->primary->fb = set->fb; 764 ret = crtc_funcs->mode_set_base(set->crtc, 765 set->x, set->y, save_set.fb); 766 if (ret != 0) { 767 set->crtc->x = save_set.x; 768 set->crtc->y = save_set.y; 769 set->crtc->primary->fb = save_set.fb; 770 goto fail; 771 } 772 } 773 774 kfree(save_connector_encoders); 775 kfree(save_encoder_crtcs); 776 return 0; 777 778 fail: 779 /* Restore all previous data. */ 780 count = 0; 781 drm_for_each_encoder(encoder, dev) { 782 encoder->crtc = save_encoder_crtcs[count++]; 783 } 784 785 count = 0; 786 drm_connector_list_iter_begin(dev, &conn_iter); 787 drm_for_each_connector_iter(connector, &conn_iter) 788 connector->encoder = save_connector_encoders[count++]; 789 drm_connector_list_iter_end(&conn_iter); 790 791 /* after fail drop reference on all unbound connectors in set, let 792 * bound connectors keep their reference 793 */ 794 for (ro = 0; ro < set->num_connectors; ro++) { 795 if (set->connectors[ro]->encoder) 796 continue; 797 drm_connector_put(set->connectors[ro]); 798 } 799 800 /* Try to restore the config */ 801 if (mode_changed && 802 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 803 save_set.y, save_set.fb)) 804 DRM_ERROR("failed to restore config after modeset failure\n"); 805 806 kfree(save_connector_encoders); 807 kfree(save_encoder_crtcs); 808 return ret; 809 } 810 EXPORT_SYMBOL(drm_crtc_helper_set_config); 811 812 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 813 { 814 int dpms = DRM_MODE_DPMS_OFF; 815 struct drm_connector *connector; 816 struct drm_connector_list_iter conn_iter; 817 struct drm_device *dev = encoder->dev; 818 819 drm_connector_list_iter_begin(dev, &conn_iter); 820 drm_for_each_connector_iter(connector, &conn_iter) 821 if (connector->encoder == encoder) 822 if (connector->dpms < dpms) 823 dpms = connector->dpms; 824 drm_connector_list_iter_end(&conn_iter); 825 826 return dpms; 827 } 828 829 /* Helper which handles bridge ordering around encoder dpms */ 830 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 831 { 832 const struct drm_encoder_helper_funcs *encoder_funcs; 833 834 encoder_funcs = encoder->helper_private; 835 if (!encoder_funcs) 836 return; 837 838 if (encoder_funcs->dpms) 839 encoder_funcs->dpms(encoder, mode); 840 } 841 842 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 843 { 844 int dpms = DRM_MODE_DPMS_OFF; 845 struct drm_connector *connector; 846 struct drm_connector_list_iter conn_iter; 847 struct drm_device *dev = crtc->dev; 848 849 drm_connector_list_iter_begin(dev, &conn_iter); 850 drm_for_each_connector_iter(connector, &conn_iter) 851 if (connector->encoder && connector->encoder->crtc == crtc) 852 if (connector->dpms < dpms) 853 dpms = connector->dpms; 854 drm_connector_list_iter_end(&conn_iter); 855 856 return dpms; 857 } 858 859 /** 860 * drm_helper_connector_dpms() - connector dpms helper implementation 861 * @connector: affected connector 862 * @mode: DPMS mode 863 * 864 * The drm_helper_connector_dpms() helper function implements the 865 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 866 * helpers. 867 * 868 * This is the main helper function provided by the CRTC helper framework for 869 * implementing the DPMS connector attribute. It computes the new desired DPMS 870 * state for all encoders and CRTCs in the output mesh and calls the 871 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 872 * provided by the driver. 873 * 874 * This function is deprecated. New drivers must implement atomic modeset 875 * support, where DPMS is handled in the DRM core. 876 * 877 * Returns: 878 * Always returns 0. 879 */ 880 int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 881 { 882 struct drm_encoder *encoder = connector->encoder; 883 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 884 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 885 886 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev)); 887 888 if (mode == connector->dpms) 889 return 0; 890 891 old_dpms = connector->dpms; 892 connector->dpms = mode; 893 894 if (encoder) 895 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 896 897 /* from off to on, do crtc then encoder */ 898 if (mode < old_dpms) { 899 if (crtc) { 900 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 901 902 if (crtc_funcs->dpms) 903 (*crtc_funcs->dpms) (crtc, 904 drm_helper_choose_crtc_dpms(crtc)); 905 } 906 if (encoder) 907 drm_helper_encoder_dpms(encoder, encoder_dpms); 908 } 909 910 /* from on to off, do encoder then crtc */ 911 if (mode > old_dpms) { 912 if (encoder) 913 drm_helper_encoder_dpms(encoder, encoder_dpms); 914 if (crtc) { 915 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 916 917 if (crtc_funcs->dpms) 918 (*crtc_funcs->dpms) (crtc, 919 drm_helper_choose_crtc_dpms(crtc)); 920 } 921 } 922 923 return 0; 924 } 925 EXPORT_SYMBOL(drm_helper_connector_dpms); 926 927 /** 928 * drm_helper_resume_force_mode - force-restore mode setting configuration 929 * @dev: drm_device which should be restored 930 * 931 * Drivers which use the mode setting helpers can use this function to 932 * force-restore the mode setting configuration e.g. on resume or when something 933 * else might have trampled over the hw state (like some overzealous old BIOSen 934 * tended to do). 935 * 936 * This helper doesn't provide a error return value since restoring the old 937 * config should never fail due to resource allocation issues since the driver 938 * has successfully set the restored configuration already. Hence this should 939 * boil down to the equivalent of a few dpms on calls, which also don't provide 940 * an error code. 941 * 942 * Drivers where simply restoring an old configuration again might fail (e.g. 943 * due to slight differences in allocating shared resources when the 944 * configuration is restored in a different order than when userspace set it up) 945 * need to use their own restore logic. 946 * 947 * This function is deprecated. New drivers should implement atomic mode- 948 * setting and use the atomic suspend/resume helpers. 949 * 950 * See also: 951 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 952 */ 953 void drm_helper_resume_force_mode(struct drm_device *dev) 954 { 955 struct drm_crtc *crtc; 956 struct drm_encoder *encoder; 957 const struct drm_crtc_helper_funcs *crtc_funcs; 958 int encoder_dpms; 959 bool ret; 960 961 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 962 963 drm_modeset_lock_all(dev); 964 drm_for_each_crtc(crtc, dev) { 965 966 if (!crtc->enabled) 967 continue; 968 969 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 970 crtc->x, crtc->y, crtc->primary->fb); 971 972 /* Restoring the old config should never fail! */ 973 if (ret == false) 974 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 975 976 /* Turn off outputs that were already powered off */ 977 if (drm_helper_choose_crtc_dpms(crtc)) { 978 drm_for_each_encoder(encoder, dev) { 979 980 if(encoder->crtc != crtc) 981 continue; 982 983 encoder_dpms = drm_helper_choose_encoder_dpms( 984 encoder); 985 986 drm_helper_encoder_dpms(encoder, encoder_dpms); 987 } 988 989 crtc_funcs = crtc->helper_private; 990 if (crtc_funcs->dpms) 991 (*crtc_funcs->dpms) (crtc, 992 drm_helper_choose_crtc_dpms(crtc)); 993 } 994 } 995 996 /* disable the unused connectors while restoring the modesetting */ 997 __drm_helper_disable_unused_functions(dev); 998 drm_modeset_unlock_all(dev); 999 } 1000 EXPORT_SYMBOL(drm_helper_resume_force_mode); 1001 1002 /** 1003 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs 1004 * @dev: DRM device whose CRTCs to turn off 1005 * 1006 * Drivers may want to call this on unload to ensure that all displays are 1007 * unlit and the GPU is in a consistent, low power state. Takes modeset locks. 1008 * 1009 * Note: This should only be used by non-atomic legacy drivers. For an atomic 1010 * version look at drm_atomic_helper_shutdown(). 1011 * 1012 * Returns: 1013 * Zero on success, error code on failure. 1014 */ 1015 int drm_helper_force_disable_all(struct drm_device *dev) 1016 { 1017 struct drm_crtc *crtc; 1018 int ret = 0; 1019 1020 drm_modeset_lock_all(dev); 1021 drm_for_each_crtc(crtc, dev) 1022 if (crtc->enabled) { 1023 struct drm_mode_set set = { 1024 .crtc = crtc, 1025 }; 1026 1027 ret = drm_mode_set_config_internal(&set); 1028 if (ret) 1029 goto out; 1030 } 1031 out: 1032 drm_modeset_unlock_all(dev); 1033 return ret; 1034 } 1035 EXPORT_SYMBOL(drm_helper_force_disable_all); 1036