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_plane_helper.h> 50 #include <drm/drm_print.h> 51 #include <drm/drm_vblank.h> 52 53 #include "drm_crtc_helper_internal.h" 54 55 DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0, 56 "DRM_UT_CORE", 57 "DRM_UT_DRIVER", 58 "DRM_UT_KMS", 59 "DRM_UT_PRIME", 60 "DRM_UT_ATOMIC", 61 "DRM_UT_VBL", 62 "DRM_UT_STATE", 63 "DRM_UT_LEASE", 64 "DRM_UT_DP", 65 "DRM_UT_DRMRES"); 66 67 /** 68 * DOC: overview 69 * 70 * The CRTC modeset helper library provides a default set_config implementation 71 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 72 * the same callbacks which drivers can use to e.g. restore the modeset 73 * configuration on resume with drm_helper_resume_force_mode(). 74 * 75 * Note that this helper library doesn't track the current power state of CRTCs 76 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even 77 * though the hardware is already in the desired state. This deficiency has been 78 * fixed in the atomic helpers. 79 * 80 * The driver callbacks are mostly compatible with the atomic modeset helpers, 81 * except for the handling of the primary plane: Atomic helpers require that the 82 * primary plane is implemented as a real standalone plane and not directly tied 83 * to the CRTC state. For easier transition this library provides functions to 84 * implement the old semantics required by the CRTC helpers using the new plane 85 * and atomic helper callbacks. 86 * 87 * Drivers are strongly urged to convert to the atomic helpers (by way of first 88 * converting to the plane helpers). New drivers must not use these functions 89 * but need to implement the atomic interface instead, potentially using the 90 * atomic helpers for that. 91 * 92 * These legacy modeset helpers use the same function table structures as 93 * all other modesetting helpers. See the documentation for struct 94 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct 95 * &drm_connector_helper_funcs. 96 */ 97 98 /** 99 * drm_helper_encoder_in_use - check if a given encoder is in use 100 * @encoder: encoder to check 101 * 102 * Checks whether @encoder is with the current mode setting output configuration 103 * in use by any connector. This doesn't mean that it is actually enabled since 104 * the DPMS state is tracked separately. 105 * 106 * Returns: 107 * True if @encoder is used, false otherwise. 108 */ 109 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 110 { 111 struct drm_connector *connector; 112 struct drm_connector_list_iter conn_iter; 113 struct drm_device *dev = encoder->dev; 114 115 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 116 117 /* 118 * We can expect this mutex to be locked if we are not panicking. 119 * Locking is currently fubar in the panic handler. 120 */ 121 if (!oops_in_progress) { 122 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 123 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 124 } 125 126 127 drm_connector_list_iter_begin(dev, &conn_iter); 128 drm_for_each_connector_iter(connector, &conn_iter) { 129 if (connector->encoder == encoder) { 130 drm_connector_list_iter_end(&conn_iter); 131 return true; 132 } 133 } 134 drm_connector_list_iter_end(&conn_iter); 135 return false; 136 } 137 EXPORT_SYMBOL(drm_helper_encoder_in_use); 138 139 /** 140 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 141 * @crtc: CRTC to check 142 * 143 * Checks whether @crtc is with the current mode setting output configuration 144 * in use by any connector. This doesn't mean that it is actually enabled since 145 * the DPMS state is tracked separately. 146 * 147 * Returns: 148 * True if @crtc is used, false otherwise. 149 */ 150 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 151 { 152 struct drm_encoder *encoder; 153 struct drm_device *dev = crtc->dev; 154 155 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 156 157 /* 158 * We can expect this mutex to be locked if we are not panicking. 159 * Locking is currently fubar in the panic handler. 160 */ 161 if (!oops_in_progress) 162 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 163 164 drm_for_each_encoder(encoder, dev) 165 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 166 return true; 167 return false; 168 } 169 EXPORT_SYMBOL(drm_helper_crtc_in_use); 170 171 static void 172 drm_encoder_disable(struct drm_encoder *encoder) 173 { 174 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 175 176 if (!encoder_funcs) 177 return; 178 179 if (encoder_funcs->disable) 180 (*encoder_funcs->disable)(encoder); 181 else if (encoder_funcs->dpms) 182 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 183 } 184 185 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 186 { 187 struct drm_encoder *encoder; 188 struct drm_crtc *crtc; 189 190 drm_warn_on_modeset_not_all_locked(dev); 191 192 drm_for_each_encoder(encoder, dev) { 193 if (!drm_helper_encoder_in_use(encoder)) { 194 drm_encoder_disable(encoder); 195 /* disconnect encoder from any connector */ 196 encoder->crtc = NULL; 197 } 198 } 199 200 drm_for_each_crtc(crtc, dev) { 201 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 202 203 crtc->enabled = drm_helper_crtc_in_use(crtc); 204 if (!crtc->enabled) { 205 if (crtc_funcs->disable) 206 (*crtc_funcs->disable)(crtc); 207 else 208 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 209 crtc->primary->fb = NULL; 210 } 211 } 212 } 213 214 /** 215 * drm_helper_disable_unused_functions - disable unused objects 216 * @dev: DRM device 217 * 218 * This function walks through the entire mode setting configuration of @dev. It 219 * will remove any CRTC links of unused encoders and encoder links of 220 * disconnected connectors. Then it will disable all unused encoders and CRTCs 221 * either by calling their disable callback if available or by calling their 222 * dpms callback with DRM_MODE_DPMS_OFF. 223 * 224 * NOTE: 225 * 226 * This function is part of the legacy modeset helper library and will cause 227 * major confusion with atomic drivers. This is because atomic helpers guarantee 228 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 229 * on an enabled functions. drm_helper_disable_unused_functions() on the other 230 * hand throws such guarantees into the wind and calls disable hooks 231 * unconditionally on unused functions. 232 */ 233 void drm_helper_disable_unused_functions(struct drm_device *dev) 234 { 235 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 236 237 drm_modeset_lock_all(dev); 238 __drm_helper_disable_unused_functions(dev); 239 drm_modeset_unlock_all(dev); 240 } 241 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 242 243 /* 244 * Check the CRTC we're going to map each output to vs. its current 245 * CRTC. If they don't match, we have to disable the output and the CRTC 246 * since the driver will have to re-route things. 247 */ 248 static void 249 drm_crtc_prepare_encoders(struct drm_device *dev) 250 { 251 const struct drm_encoder_helper_funcs *encoder_funcs; 252 struct drm_encoder *encoder; 253 254 drm_for_each_encoder(encoder, dev) { 255 encoder_funcs = encoder->helper_private; 256 if (!encoder_funcs) 257 continue; 258 259 /* Disable unused encoders */ 260 if (encoder->crtc == NULL) 261 drm_encoder_disable(encoder); 262 } 263 } 264 265 /** 266 * drm_crtc_helper_set_mode - internal helper to set a mode 267 * @crtc: CRTC to program 268 * @mode: mode to use 269 * @x: horizontal offset into the surface 270 * @y: vertical offset into the surface 271 * @old_fb: old framebuffer, for cleanup 272 * 273 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 274 * to fixup or reject the mode prior to trying to set it. This is an internal 275 * helper that drivers could e.g. use to update properties that require the 276 * entire output pipe to be disabled and re-enabled in a new configuration. For 277 * example for changing whether audio is enabled on a hdmi link or for changing 278 * panel fitter or dither attributes. It is also called by the 279 * drm_crtc_helper_set_config() helper function to drive the mode setting 280 * sequence. 281 * 282 * Returns: 283 * True if the mode was set successfully, false otherwise. 284 */ 285 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 286 struct drm_display_mode *mode, 287 int x, int y, 288 struct drm_framebuffer *old_fb) 289 { 290 struct drm_device *dev = crtc->dev; 291 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 292 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 293 const struct drm_encoder_helper_funcs *encoder_funcs; 294 int saved_x, saved_y; 295 bool saved_enabled; 296 struct drm_encoder *encoder; 297 bool ret = true; 298 299 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 300 301 drm_warn_on_modeset_not_all_locked(dev); 302 303 saved_enabled = crtc->enabled; 304 crtc->enabled = drm_helper_crtc_in_use(crtc); 305 if (!crtc->enabled) 306 return true; 307 308 adjusted_mode = drm_mode_duplicate(dev, mode); 309 if (!adjusted_mode) { 310 crtc->enabled = saved_enabled; 311 return false; 312 } 313 314 drm_mode_init(&saved_mode, &crtc->mode); 315 drm_mode_init(&saved_hwmode, &crtc->hwmode); 316 saved_x = crtc->x; 317 saved_y = crtc->y; 318 319 /* Update crtc values up front so the driver can rely on them for mode 320 * setting. 321 */ 322 drm_mode_copy(&crtc->mode, mode); 323 crtc->x = x; 324 crtc->y = y; 325 326 /* Pass our mode to the connectors and the CRTC to give them a chance to 327 * adjust it according to limitations or connector properties, and also 328 * a chance to reject the mode entirely. 329 */ 330 drm_for_each_encoder(encoder, dev) { 331 332 if (encoder->crtc != crtc) 333 continue; 334 335 encoder_funcs = encoder->helper_private; 336 if (!encoder_funcs) 337 continue; 338 339 encoder_funcs = encoder->helper_private; 340 if (encoder_funcs->mode_fixup) { 341 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 342 adjusted_mode))) { 343 DRM_DEBUG_KMS("Encoder fixup failed\n"); 344 goto done; 345 } 346 } 347 } 348 349 if (crtc_funcs->mode_fixup) { 350 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 351 adjusted_mode))) { 352 DRM_DEBUG_KMS("CRTC fixup failed\n"); 353 goto done; 354 } 355 } 356 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 357 358 drm_mode_copy(&crtc->hwmode, adjusted_mode); 359 360 /* Prepare the encoders and CRTCs before setting the mode. */ 361 drm_for_each_encoder(encoder, dev) { 362 363 if (encoder->crtc != crtc) 364 continue; 365 366 encoder_funcs = encoder->helper_private; 367 if (!encoder_funcs) 368 continue; 369 370 /* Disable the encoders as the first thing we do. */ 371 if (encoder_funcs->prepare) 372 encoder_funcs->prepare(encoder); 373 } 374 375 drm_crtc_prepare_encoders(dev); 376 377 crtc_funcs->prepare(crtc); 378 379 /* Set up the DPLL and any encoders state that needs to adjust or depend 380 * on the DPLL. 381 */ 382 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 383 if (!ret) 384 goto done; 385 386 drm_for_each_encoder(encoder, dev) { 387 388 if (encoder->crtc != crtc) 389 continue; 390 391 encoder_funcs = encoder->helper_private; 392 if (!encoder_funcs) 393 continue; 394 395 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n", 396 encoder->base.id, encoder->name, mode->name); 397 if (encoder_funcs->mode_set) 398 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 399 } 400 401 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 402 crtc_funcs->commit(crtc); 403 404 drm_for_each_encoder(encoder, dev) { 405 406 if (encoder->crtc != crtc) 407 continue; 408 409 encoder_funcs = encoder->helper_private; 410 if (!encoder_funcs) 411 continue; 412 413 if (encoder_funcs->commit) 414 encoder_funcs->commit(encoder); 415 } 416 417 /* Calculate and store various constants which 418 * are later needed by vblank and swap-completion 419 * timestamping. They are derived from true hwmode. 420 */ 421 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 422 423 /* FIXME: add subpixel order */ 424 done: 425 drm_mode_destroy(dev, adjusted_mode); 426 if (!ret) { 427 crtc->enabled = saved_enabled; 428 drm_mode_copy(&crtc->mode, &saved_mode); 429 drm_mode_copy(&crtc->hwmode, &saved_hwmode); 430 crtc->x = saved_x; 431 crtc->y = saved_y; 432 } 433 434 return ret; 435 } 436 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 437 438 static void 439 drm_crtc_helper_disable(struct drm_crtc *crtc) 440 { 441 struct drm_device *dev = crtc->dev; 442 struct drm_connector *connector; 443 struct drm_encoder *encoder; 444 445 /* Decouple all encoders and their attached connectors from this crtc */ 446 drm_for_each_encoder(encoder, dev) { 447 struct drm_connector_list_iter conn_iter; 448 449 if (encoder->crtc != crtc) 450 continue; 451 452 drm_connector_list_iter_begin(dev, &conn_iter); 453 drm_for_each_connector_iter(connector, &conn_iter) { 454 if (connector->encoder != encoder) 455 continue; 456 457 connector->encoder = NULL; 458 459 /* 460 * drm_helper_disable_unused_functions() ought to be 461 * doing this, but since we've decoupled the encoder 462 * from the connector above, the required connection 463 * between them is henceforth no longer available. 464 */ 465 connector->dpms = DRM_MODE_DPMS_OFF; 466 467 /* we keep a reference while the encoder is bound */ 468 drm_connector_put(connector); 469 } 470 drm_connector_list_iter_end(&conn_iter); 471 } 472 473 __drm_helper_disable_unused_functions(dev); 474 } 475 476 /* 477 * For connectors that support multiple encoders, either the 478 * .atomic_best_encoder() or .best_encoder() operation must be implemented. 479 */ 480 struct drm_encoder * 481 drm_connector_get_single_encoder(struct drm_connector *connector) 482 { 483 struct drm_encoder *encoder; 484 485 WARN_ON(hweight32(connector->possible_encoders) > 1); 486 drm_connector_for_each_possible_encoder(connector, encoder) 487 return encoder; 488 489 return NULL; 490 } 491 492 /** 493 * drm_crtc_helper_set_config - set a new config from userspace 494 * @set: mode set configuration 495 * @ctx: lock acquire context, not used here 496 * 497 * The drm_crtc_helper_set_config() helper function implements the of 498 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 499 * helpers. 500 * 501 * It first tries to locate the best encoder for each connector by calling the 502 * connector @drm_connector_helper_funcs.best_encoder helper operation. 503 * 504 * After locating the appropriate encoders, the helper function will call the 505 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 506 * or reject it completely in which case an error will be returned to the 507 * application. If the new configuration after mode adjustment is identical to 508 * the current configuration the helper function will return without performing 509 * any other operation. 510 * 511 * If the adjusted mode is identical to the current mode but changes to the 512 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 513 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 514 * 515 * If the adjusted mode differs from the current mode, or if the 516 * ->mode_set_base() helper operation is not provided, the helper function 517 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 518 * and ->commit() CRTC and encoder helper operations, in that order. 519 * Alternatively it can also use the dpms and disable helper operations. For 520 * details see &struct drm_crtc_helper_funcs and struct 521 * &drm_encoder_helper_funcs. 522 * 523 * This function is deprecated. New drivers must implement atomic modeset 524 * support, for which this function is unsuitable. Instead drivers should use 525 * drm_atomic_helper_set_config(). 526 * 527 * Returns: 528 * Returns 0 on success, negative errno numbers on failure. 529 */ 530 int drm_crtc_helper_set_config(struct drm_mode_set *set, 531 struct drm_modeset_acquire_ctx *ctx) 532 { 533 struct drm_device *dev; 534 struct drm_crtc **save_encoder_crtcs, *new_crtc; 535 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 536 bool mode_changed = false; /* if true do a full mode set */ 537 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 538 struct drm_connector *connector; 539 struct drm_connector_list_iter conn_iter; 540 int count = 0, ro, fail = 0; 541 const struct drm_crtc_helper_funcs *crtc_funcs; 542 struct drm_mode_set save_set; 543 int ret; 544 int i; 545 546 DRM_DEBUG_KMS("\n"); 547 548 BUG_ON(!set); 549 BUG_ON(!set->crtc); 550 BUG_ON(!set->crtc->helper_private); 551 552 /* Enforce sane interface api - has been abused by the fb helper. */ 553 BUG_ON(!set->mode && set->fb); 554 BUG_ON(set->fb && set->num_connectors == 0); 555 556 crtc_funcs = set->crtc->helper_private; 557 558 dev = set->crtc->dev; 559 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 560 561 if (!set->mode) 562 set->fb = NULL; 563 564 if (set->fb) { 565 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 566 set->crtc->base.id, set->crtc->name, 567 set->fb->base.id, 568 (int)set->num_connectors, set->x, set->y); 569 } else { 570 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 571 set->crtc->base.id, set->crtc->name); 572 drm_crtc_helper_disable(set->crtc); 573 return 0; 574 } 575 576 drm_warn_on_modeset_not_all_locked(dev); 577 578 /* 579 * Allocate space for the backup of all (non-pointer) encoder and 580 * connector data. 581 */ 582 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder, 583 sizeof(struct drm_crtc *), GFP_KERNEL); 584 if (!save_encoder_crtcs) 585 return -ENOMEM; 586 587 save_connector_encoders = kcalloc(dev->mode_config.num_connector, 588 sizeof(struct drm_encoder *), GFP_KERNEL); 589 if (!save_connector_encoders) { 590 kfree(save_encoder_crtcs); 591 return -ENOMEM; 592 } 593 594 /* 595 * Copy data. Note that driver private data is not affected. 596 * Should anything bad happen only the expected state is 597 * restored, not the drivers personal bookkeeping. 598 */ 599 count = 0; 600 drm_for_each_encoder(encoder, dev) { 601 save_encoder_crtcs[count++] = encoder->crtc; 602 } 603 604 count = 0; 605 drm_connector_list_iter_begin(dev, &conn_iter); 606 drm_for_each_connector_iter(connector, &conn_iter) 607 save_connector_encoders[count++] = connector->encoder; 608 drm_connector_list_iter_end(&conn_iter); 609 610 save_set.crtc = set->crtc; 611 save_set.mode = &set->crtc->mode; 612 save_set.x = set->crtc->x; 613 save_set.y = set->crtc->y; 614 save_set.fb = set->crtc->primary->fb; 615 616 /* We should be able to check here if the fb has the same properties 617 * and then just flip_or_move it */ 618 if (set->crtc->primary->fb != set->fb) { 619 /* If we have no fb then treat it as a full mode set */ 620 if (set->crtc->primary->fb == NULL) { 621 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 622 mode_changed = true; 623 } else if (set->fb->format != set->crtc->primary->fb->format) { 624 mode_changed = true; 625 } else 626 fb_changed = true; 627 } 628 629 if (set->x != set->crtc->x || set->y != set->crtc->y) 630 fb_changed = true; 631 632 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 633 DRM_DEBUG_KMS("modes are different, full mode set\n"); 634 drm_mode_debug_printmodeline(&set->crtc->mode); 635 drm_mode_debug_printmodeline(set->mode); 636 mode_changed = true; 637 } 638 639 /* take a reference on all unbound connectors in set, reuse the 640 * already taken reference for bound connectors 641 */ 642 for (ro = 0; ro < set->num_connectors; ro++) { 643 if (set->connectors[ro]->encoder) 644 continue; 645 drm_connector_get(set->connectors[ro]); 646 } 647 648 /* a) traverse passed in connector list and get encoders for them */ 649 count = 0; 650 drm_connector_list_iter_begin(dev, &conn_iter); 651 drm_for_each_connector_iter(connector, &conn_iter) { 652 const struct drm_connector_helper_funcs *connector_funcs = 653 connector->helper_private; 654 new_encoder = connector->encoder; 655 for (ro = 0; ro < set->num_connectors; ro++) { 656 if (set->connectors[ro] == connector) { 657 if (connector_funcs->best_encoder) 658 new_encoder = connector_funcs->best_encoder(connector); 659 else 660 new_encoder = drm_connector_get_single_encoder(connector); 661 662 /* if we can't get an encoder for a connector 663 we are setting now - then fail */ 664 if (new_encoder == NULL) 665 /* don't break so fail path works correct */ 666 fail = 1; 667 668 if (connector->dpms != DRM_MODE_DPMS_ON) { 669 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 670 mode_changed = true; 671 } 672 673 break; 674 } 675 } 676 677 if (new_encoder != connector->encoder) { 678 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 679 mode_changed = true; 680 /* If the encoder is reused for another connector, then 681 * the appropriate crtc will be set later. 682 */ 683 if (connector->encoder) 684 connector->encoder->crtc = NULL; 685 connector->encoder = new_encoder; 686 } 687 } 688 drm_connector_list_iter_end(&conn_iter); 689 690 if (fail) { 691 ret = -EINVAL; 692 goto fail; 693 } 694 695 count = 0; 696 drm_connector_list_iter_begin(dev, &conn_iter); 697 drm_for_each_connector_iter(connector, &conn_iter) { 698 if (!connector->encoder) 699 continue; 700 701 if (connector->encoder->crtc == set->crtc) 702 new_crtc = NULL; 703 else 704 new_crtc = connector->encoder->crtc; 705 706 for (ro = 0; ro < set->num_connectors; ro++) { 707 if (set->connectors[ro] == connector) 708 new_crtc = set->crtc; 709 } 710 711 /* Make sure the new CRTC will work with the encoder */ 712 if (new_crtc && 713 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 714 ret = -EINVAL; 715 drm_connector_list_iter_end(&conn_iter); 716 goto fail; 717 } 718 if (new_crtc != connector->encoder->crtc) { 719 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 720 mode_changed = true; 721 connector->encoder->crtc = new_crtc; 722 } 723 if (new_crtc) { 724 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 725 connector->base.id, connector->name, 726 new_crtc->base.id, new_crtc->name); 727 } else { 728 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 729 connector->base.id, connector->name); 730 } 731 } 732 drm_connector_list_iter_end(&conn_iter); 733 734 /* mode_set_base is not a required function */ 735 if (fb_changed && !crtc_funcs->mode_set_base) 736 mode_changed = true; 737 738 if (mode_changed) { 739 if (drm_helper_crtc_in_use(set->crtc)) { 740 DRM_DEBUG_KMS("attempting to set mode from" 741 " userspace\n"); 742 drm_mode_debug_printmodeline(set->mode); 743 set->crtc->primary->fb = set->fb; 744 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 745 set->x, set->y, 746 save_set.fb)) { 747 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 748 set->crtc->base.id, set->crtc->name); 749 set->crtc->primary->fb = save_set.fb; 750 ret = -EINVAL; 751 goto fail; 752 } 753 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 754 for (i = 0; i < set->num_connectors; i++) { 755 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 756 set->connectors[i]->name); 757 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 758 } 759 } 760 __drm_helper_disable_unused_functions(dev); 761 } else if (fb_changed) { 762 set->crtc->x = set->x; 763 set->crtc->y = set->y; 764 set->crtc->primary->fb = set->fb; 765 ret = crtc_funcs->mode_set_base(set->crtc, 766 set->x, set->y, save_set.fb); 767 if (ret != 0) { 768 set->crtc->x = save_set.x; 769 set->crtc->y = save_set.y; 770 set->crtc->primary->fb = save_set.fb; 771 goto fail; 772 } 773 } 774 775 kfree(save_connector_encoders); 776 kfree(save_encoder_crtcs); 777 return 0; 778 779 fail: 780 /* Restore all previous data. */ 781 count = 0; 782 drm_for_each_encoder(encoder, dev) { 783 encoder->crtc = save_encoder_crtcs[count++]; 784 } 785 786 count = 0; 787 drm_connector_list_iter_begin(dev, &conn_iter); 788 drm_for_each_connector_iter(connector, &conn_iter) 789 connector->encoder = save_connector_encoders[count++]; 790 drm_connector_list_iter_end(&conn_iter); 791 792 /* after fail drop reference on all unbound connectors in set, let 793 * bound connectors keep their reference 794 */ 795 for (ro = 0; ro < set->num_connectors; ro++) { 796 if (set->connectors[ro]->encoder) 797 continue; 798 drm_connector_put(set->connectors[ro]); 799 } 800 801 /* Try to restore the config */ 802 if (mode_changed && 803 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 804 save_set.y, save_set.fb)) 805 DRM_ERROR("failed to restore config after modeset failure\n"); 806 807 kfree(save_connector_encoders); 808 kfree(save_encoder_crtcs); 809 return ret; 810 } 811 EXPORT_SYMBOL(drm_crtc_helper_set_config); 812 813 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 814 { 815 int dpms = DRM_MODE_DPMS_OFF; 816 struct drm_connector *connector; 817 struct drm_connector_list_iter conn_iter; 818 struct drm_device *dev = encoder->dev; 819 820 drm_connector_list_iter_begin(dev, &conn_iter); 821 drm_for_each_connector_iter(connector, &conn_iter) 822 if (connector->encoder == encoder) 823 if (connector->dpms < dpms) 824 dpms = connector->dpms; 825 drm_connector_list_iter_end(&conn_iter); 826 827 return dpms; 828 } 829 830 /* Helper which handles bridge ordering around encoder dpms */ 831 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 832 { 833 const struct drm_encoder_helper_funcs *encoder_funcs; 834 835 encoder_funcs = encoder->helper_private; 836 if (!encoder_funcs) 837 return; 838 839 if (encoder_funcs->dpms) 840 encoder_funcs->dpms(encoder, mode); 841 } 842 843 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 844 { 845 int dpms = DRM_MODE_DPMS_OFF; 846 struct drm_connector *connector; 847 struct drm_connector_list_iter conn_iter; 848 struct drm_device *dev = crtc->dev; 849 850 drm_connector_list_iter_begin(dev, &conn_iter); 851 drm_for_each_connector_iter(connector, &conn_iter) 852 if (connector->encoder && connector->encoder->crtc == crtc) 853 if (connector->dpms < dpms) 854 dpms = connector->dpms; 855 drm_connector_list_iter_end(&conn_iter); 856 857 return dpms; 858 } 859 860 /** 861 * drm_helper_connector_dpms() - connector dpms helper implementation 862 * @connector: affected connector 863 * @mode: DPMS mode 864 * 865 * The drm_helper_connector_dpms() helper function implements the 866 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 867 * helpers. 868 * 869 * This is the main helper function provided by the CRTC helper framework for 870 * implementing the DPMS connector attribute. It computes the new desired DPMS 871 * state for all encoders and CRTCs in the output mesh and calls the 872 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 873 * provided by the driver. 874 * 875 * This function is deprecated. New drivers must implement atomic modeset 876 * support, where DPMS is handled in the DRM core. 877 * 878 * Returns: 879 * Always returns 0. 880 */ 881 int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 882 { 883 struct drm_encoder *encoder = connector->encoder; 884 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 885 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 886 887 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev)); 888 889 if (mode == connector->dpms) 890 return 0; 891 892 old_dpms = connector->dpms; 893 connector->dpms = mode; 894 895 if (encoder) 896 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 897 898 /* from off to on, do crtc then encoder */ 899 if (mode < old_dpms) { 900 if (crtc) { 901 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 902 903 if (crtc_funcs->dpms) 904 (*crtc_funcs->dpms) (crtc, 905 drm_helper_choose_crtc_dpms(crtc)); 906 } 907 if (encoder) 908 drm_helper_encoder_dpms(encoder, encoder_dpms); 909 } 910 911 /* from on to off, do encoder then crtc */ 912 if (mode > old_dpms) { 913 if (encoder) 914 drm_helper_encoder_dpms(encoder, encoder_dpms); 915 if (crtc) { 916 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 917 918 if (crtc_funcs->dpms) 919 (*crtc_funcs->dpms) (crtc, 920 drm_helper_choose_crtc_dpms(crtc)); 921 } 922 } 923 924 return 0; 925 } 926 EXPORT_SYMBOL(drm_helper_connector_dpms); 927 928 /** 929 * drm_helper_resume_force_mode - force-restore mode setting configuration 930 * @dev: drm_device which should be restored 931 * 932 * Drivers which use the mode setting helpers can use this function to 933 * force-restore the mode setting configuration e.g. on resume or when something 934 * else might have trampled over the hw state (like some overzealous old BIOSen 935 * tended to do). 936 * 937 * This helper doesn't provide a error return value since restoring the old 938 * config should never fail due to resource allocation issues since the driver 939 * has successfully set the restored configuration already. Hence this should 940 * boil down to the equivalent of a few dpms on calls, which also don't provide 941 * an error code. 942 * 943 * Drivers where simply restoring an old configuration again might fail (e.g. 944 * due to slight differences in allocating shared resources when the 945 * configuration is restored in a different order than when userspace set it up) 946 * need to use their own restore logic. 947 * 948 * This function is deprecated. New drivers should implement atomic mode- 949 * setting and use the atomic suspend/resume helpers. 950 * 951 * See also: 952 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 953 */ 954 void drm_helper_resume_force_mode(struct drm_device *dev) 955 { 956 struct drm_crtc *crtc; 957 struct drm_encoder *encoder; 958 const struct drm_crtc_helper_funcs *crtc_funcs; 959 int encoder_dpms; 960 bool ret; 961 962 WARN_ON(drm_drv_uses_atomic_modeset(dev)); 963 964 drm_modeset_lock_all(dev); 965 drm_for_each_crtc(crtc, dev) { 966 967 if (!crtc->enabled) 968 continue; 969 970 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 971 crtc->x, crtc->y, crtc->primary->fb); 972 973 /* Restoring the old config should never fail! */ 974 if (ret == false) 975 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 976 977 /* Turn off outputs that were already powered off */ 978 if (drm_helper_choose_crtc_dpms(crtc)) { 979 drm_for_each_encoder(encoder, dev) { 980 981 if(encoder->crtc != crtc) 982 continue; 983 984 encoder_dpms = drm_helper_choose_encoder_dpms( 985 encoder); 986 987 drm_helper_encoder_dpms(encoder, encoder_dpms); 988 } 989 990 crtc_funcs = crtc->helper_private; 991 if (crtc_funcs->dpms) 992 (*crtc_funcs->dpms) (crtc, 993 drm_helper_choose_crtc_dpms(crtc)); 994 } 995 } 996 997 /* disable the unused connectors while restoring the modesetting */ 998 __drm_helper_disable_unused_functions(dev); 999 drm_modeset_unlock_all(dev); 1000 } 1001 EXPORT_SYMBOL(drm_helper_resume_force_mode); 1002 1003 /** 1004 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs 1005 * @dev: DRM device whose CRTCs to turn off 1006 * 1007 * Drivers may want to call this on unload to ensure that all displays are 1008 * unlit and the GPU is in a consistent, low power state. Takes modeset locks. 1009 * 1010 * Note: This should only be used by non-atomic legacy drivers. For an atomic 1011 * version look at drm_atomic_helper_shutdown(). 1012 * 1013 * Returns: 1014 * Zero on success, error code on failure. 1015 */ 1016 int drm_helper_force_disable_all(struct drm_device *dev) 1017 { 1018 struct drm_crtc *crtc; 1019 int ret = 0; 1020 1021 drm_modeset_lock_all(dev); 1022 drm_for_each_crtc(crtc, dev) 1023 if (crtc->enabled) { 1024 struct drm_mode_set set = { 1025 .crtc = crtc, 1026 }; 1027 1028 ret = drm_mode_set_config_internal(&set); 1029 if (ret) 1030 goto out; 1031 } 1032 out: 1033 drm_modeset_unlock_all(dev); 1034 return ret; 1035 } 1036 EXPORT_SYMBOL(drm_helper_force_disable_all); 1037