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/kernel.h> 33 #include <linux/export.h> 34 #include <linux/moduleparam.h> 35 36 #include <drm/drmP.h> 37 #include <drm/drm_atomic.h> 38 #include <drm/drm_crtc.h> 39 #include <drm/drm_encoder.h> 40 #include <drm/drm_fourcc.h> 41 #include <drm/drm_crtc_helper.h> 42 #include <drm/drm_fb_helper.h> 43 #include <drm/drm_plane_helper.h> 44 #include <drm/drm_atomic_helper.h> 45 #include <drm/drm_edid.h> 46 47 /** 48 * DOC: overview 49 * 50 * The CRTC modeset helper library provides a default set_config implementation 51 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 52 * the same callbacks which drivers can use to e.g. restore the modeset 53 * configuration on resume with drm_helper_resume_force_mode(). 54 * 55 * Note that this helper library doesn't track the current power state of CRTCs 56 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even 57 * though the hardware is already in the desired state. This deficiency has been 58 * fixed in the atomic helpers. 59 * 60 * The driver callbacks are mostly compatible with the atomic modeset helpers, 61 * except for the handling of the primary plane: Atomic helpers require that the 62 * primary plane is implemented as a real standalone plane and not directly tied 63 * to the CRTC state. For easier transition this library provides functions to 64 * implement the old semantics required by the CRTC helpers using the new plane 65 * and atomic helper callbacks. 66 * 67 * Drivers are strongly urged to convert to the atomic helpers (by way of first 68 * converting to the plane helpers). New drivers must not use these functions 69 * but need to implement the atomic interface instead, potentially using the 70 * atomic helpers for that. 71 * 72 * These legacy modeset helpers use the same function table structures as 73 * all other modesetting helpers. See the documentation for struct 74 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct 75 * &drm_connector_helper_funcs. 76 */ 77 78 /** 79 * drm_helper_encoder_in_use - check if a given encoder is in use 80 * @encoder: encoder to check 81 * 82 * Checks whether @encoder is with the current mode setting output configuration 83 * in use by any connector. This doesn't mean that it is actually enabled since 84 * the DPMS state is tracked separately. 85 * 86 * Returns: 87 * True if @encoder is used, false otherwise. 88 */ 89 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 90 { 91 struct drm_connector *connector; 92 struct drm_connector_list_iter conn_iter; 93 struct drm_device *dev = encoder->dev; 94 95 /* 96 * We can expect this mutex to be locked if we are not panicking. 97 * Locking is currently fubar in the panic handler. 98 */ 99 if (!oops_in_progress) { 100 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 101 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 102 } 103 104 105 drm_connector_list_iter_begin(dev, &conn_iter); 106 drm_for_each_connector_iter(connector, &conn_iter) { 107 if (connector->encoder == encoder) { 108 drm_connector_list_iter_end(&conn_iter); 109 return true; 110 } 111 } 112 drm_connector_list_iter_end(&conn_iter); 113 return false; 114 } 115 EXPORT_SYMBOL(drm_helper_encoder_in_use); 116 117 /** 118 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 119 * @crtc: CRTC to check 120 * 121 * Checks whether @crtc is with the current mode setting output configuration 122 * in use by any connector. This doesn't mean that it is actually enabled since 123 * the DPMS state is tracked separately. 124 * 125 * Returns: 126 * True if @crtc is used, false otherwise. 127 */ 128 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 129 { 130 struct drm_encoder *encoder; 131 struct drm_device *dev = crtc->dev; 132 133 /* 134 * We can expect this mutex to be locked if we are not panicking. 135 * Locking is currently fubar in the panic handler. 136 */ 137 if (!oops_in_progress) 138 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 139 140 drm_for_each_encoder(encoder, dev) 141 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 142 return true; 143 return false; 144 } 145 EXPORT_SYMBOL(drm_helper_crtc_in_use); 146 147 static void 148 drm_encoder_disable(struct drm_encoder *encoder) 149 { 150 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 151 152 if (!encoder_funcs) 153 return; 154 155 drm_bridge_disable(encoder->bridge); 156 157 if (encoder_funcs->disable) 158 (*encoder_funcs->disable)(encoder); 159 else if (encoder_funcs->dpms) 160 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 161 162 drm_bridge_post_disable(encoder->bridge); 163 } 164 165 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 166 { 167 struct drm_encoder *encoder; 168 struct drm_crtc *crtc; 169 170 drm_warn_on_modeset_not_all_locked(dev); 171 172 drm_for_each_encoder(encoder, dev) { 173 if (!drm_helper_encoder_in_use(encoder)) { 174 drm_encoder_disable(encoder); 175 /* disconnect encoder from any connector */ 176 encoder->crtc = NULL; 177 } 178 } 179 180 drm_for_each_crtc(crtc, dev) { 181 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 182 crtc->enabled = drm_helper_crtc_in_use(crtc); 183 if (!crtc->enabled) { 184 if (crtc_funcs->disable) 185 (*crtc_funcs->disable)(crtc); 186 else 187 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 188 crtc->primary->fb = NULL; 189 } 190 } 191 } 192 193 /** 194 * drm_helper_disable_unused_functions - disable unused objects 195 * @dev: DRM device 196 * 197 * This function walks through the entire mode setting configuration of @dev. It 198 * will remove any CRTC links of unused encoders and encoder links of 199 * disconnected connectors. Then it will disable all unused encoders and CRTCs 200 * either by calling their disable callback if available or by calling their 201 * dpms callback with DRM_MODE_DPMS_OFF. 202 * 203 * NOTE: 204 * 205 * This function is part of the legacy modeset helper library and will cause 206 * major confusion with atomic drivers. This is because atomic helpers guarantee 207 * to never call ->disable() hooks on a disabled function, or ->enable() hooks 208 * on an enabled functions. drm_helper_disable_unused_functions() on the other 209 * hand throws such guarantees into the wind and calls disable hooks 210 * unconditionally on unused functions. 211 */ 212 void drm_helper_disable_unused_functions(struct drm_device *dev) 213 { 214 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) 215 DRM_ERROR("Called for atomic driver, this is not what you want.\n"); 216 217 drm_modeset_lock_all(dev); 218 __drm_helper_disable_unused_functions(dev); 219 drm_modeset_unlock_all(dev); 220 } 221 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 222 223 /* 224 * Check the CRTC we're going to map each output to vs. its current 225 * CRTC. If they don't match, we have to disable the output and the CRTC 226 * since the driver will have to re-route things. 227 */ 228 static void 229 drm_crtc_prepare_encoders(struct drm_device *dev) 230 { 231 const struct drm_encoder_helper_funcs *encoder_funcs; 232 struct drm_encoder *encoder; 233 234 drm_for_each_encoder(encoder, dev) { 235 encoder_funcs = encoder->helper_private; 236 if (!encoder_funcs) 237 continue; 238 239 /* Disable unused encoders */ 240 if (encoder->crtc == NULL) 241 drm_encoder_disable(encoder); 242 /* Disable encoders whose CRTC is about to change */ 243 if (encoder_funcs->get_crtc && 244 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 245 drm_encoder_disable(encoder); 246 } 247 } 248 249 /** 250 * drm_crtc_helper_set_mode - internal helper to set a mode 251 * @crtc: CRTC to program 252 * @mode: mode to use 253 * @x: horizontal offset into the surface 254 * @y: vertical offset into the surface 255 * @old_fb: old framebuffer, for cleanup 256 * 257 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 258 * to fixup or reject the mode prior to trying to set it. This is an internal 259 * helper that drivers could e.g. use to update properties that require the 260 * entire output pipe to be disabled and re-enabled in a new configuration. For 261 * example for changing whether audio is enabled on a hdmi link or for changing 262 * panel fitter or dither attributes. It is also called by the 263 * drm_crtc_helper_set_config() helper function to drive the mode setting 264 * sequence. 265 * 266 * Returns: 267 * True if the mode was set successfully, false otherwise. 268 */ 269 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 270 struct drm_display_mode *mode, 271 int x, int y, 272 struct drm_framebuffer *old_fb) 273 { 274 struct drm_device *dev = crtc->dev; 275 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 276 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 277 const struct drm_encoder_helper_funcs *encoder_funcs; 278 int saved_x, saved_y; 279 bool saved_enabled; 280 struct drm_encoder *encoder; 281 bool ret = true; 282 283 drm_warn_on_modeset_not_all_locked(dev); 284 285 saved_enabled = crtc->enabled; 286 crtc->enabled = drm_helper_crtc_in_use(crtc); 287 if (!crtc->enabled) 288 return true; 289 290 adjusted_mode = drm_mode_duplicate(dev, mode); 291 if (!adjusted_mode) { 292 crtc->enabled = saved_enabled; 293 return false; 294 } 295 296 saved_mode = crtc->mode; 297 saved_hwmode = crtc->hwmode; 298 saved_x = crtc->x; 299 saved_y = crtc->y; 300 301 /* Update crtc values up front so the driver can rely on them for mode 302 * setting. 303 */ 304 crtc->mode = *mode; 305 crtc->x = x; 306 crtc->y = y; 307 308 /* Pass our mode to the connectors and the CRTC to give them a chance to 309 * adjust it according to limitations or connector properties, and also 310 * a chance to reject the mode entirely. 311 */ 312 drm_for_each_encoder(encoder, dev) { 313 314 if (encoder->crtc != crtc) 315 continue; 316 317 encoder_funcs = encoder->helper_private; 318 if (!encoder_funcs) 319 continue; 320 321 ret = drm_bridge_mode_fixup(encoder->bridge, 322 mode, adjusted_mode); 323 if (!ret) { 324 DRM_DEBUG_KMS("Bridge fixup failed\n"); 325 goto done; 326 } 327 328 encoder_funcs = encoder->helper_private; 329 if (encoder_funcs->mode_fixup) { 330 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 331 adjusted_mode))) { 332 DRM_DEBUG_KMS("Encoder fixup failed\n"); 333 goto done; 334 } 335 } 336 } 337 338 if (crtc_funcs->mode_fixup) { 339 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, 340 adjusted_mode))) { 341 DRM_DEBUG_KMS("CRTC fixup failed\n"); 342 goto done; 343 } 344 } 345 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); 346 347 crtc->hwmode = *adjusted_mode; 348 349 /* Prepare the encoders and CRTCs before setting the mode. */ 350 drm_for_each_encoder(encoder, dev) { 351 352 if (encoder->crtc != crtc) 353 continue; 354 355 encoder_funcs = encoder->helper_private; 356 if (!encoder_funcs) 357 continue; 358 359 drm_bridge_disable(encoder->bridge); 360 361 /* Disable the encoders as the first thing we do. */ 362 if (encoder_funcs->prepare) 363 encoder_funcs->prepare(encoder); 364 365 drm_bridge_post_disable(encoder->bridge); 366 } 367 368 drm_crtc_prepare_encoders(dev); 369 370 crtc_funcs->prepare(crtc); 371 372 /* Set up the DPLL and any encoders state that needs to adjust or depend 373 * on the DPLL. 374 */ 375 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 376 if (!ret) 377 goto done; 378 379 drm_for_each_encoder(encoder, dev) { 380 381 if (encoder->crtc != crtc) 382 continue; 383 384 encoder_funcs = encoder->helper_private; 385 if (!encoder_funcs) 386 continue; 387 388 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 389 encoder->base.id, encoder->name, 390 mode->base.id, mode->name); 391 if (encoder_funcs->mode_set) 392 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 393 394 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode); 395 } 396 397 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 398 crtc_funcs->commit(crtc); 399 400 drm_for_each_encoder(encoder, dev) { 401 402 if (encoder->crtc != crtc) 403 continue; 404 405 encoder_funcs = encoder->helper_private; 406 if (!encoder_funcs) 407 continue; 408 409 drm_bridge_pre_enable(encoder->bridge); 410 411 if (encoder_funcs->commit) 412 encoder_funcs->commit(encoder); 413 414 drm_bridge_enable(encoder->bridge); 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 crtc->mode = saved_mode; 429 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 * drm_crtc_helper_set_config - set a new config from userspace 478 * @set: mode set configuration 479 * @ctx: lock acquire context, not used here 480 * 481 * The drm_crtc_helper_set_config() helper function implements the of 482 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC 483 * helpers. 484 * 485 * It first tries to locate the best encoder for each connector by calling the 486 * connector @drm_connector_helper_funcs.best_encoder helper operation. 487 * 488 * After locating the appropriate encoders, the helper function will call the 489 * mode_fixup encoder and CRTC helper operations to adjust the requested mode, 490 * or reject it completely in which case an error will be returned to the 491 * application. If the new configuration after mode adjustment is identical to 492 * the current configuration the helper function will return without performing 493 * any other operation. 494 * 495 * If the adjusted mode is identical to the current mode but changes to the 496 * frame buffer need to be applied, the drm_crtc_helper_set_config() function 497 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation. 498 * 499 * If the adjusted mode differs from the current mode, or if the 500 * ->mode_set_base() helper operation is not provided, the helper function 501 * performs a full mode set sequence by calling the ->prepare(), ->mode_set() 502 * and ->commit() CRTC and encoder helper operations, in that order. 503 * Alternatively it can also use the dpms and disable helper operations. For 504 * details see &struct drm_crtc_helper_funcs and struct 505 * &drm_encoder_helper_funcs. 506 * 507 * This function is deprecated. New drivers must implement atomic modeset 508 * support, for which this function is unsuitable. Instead drivers should use 509 * drm_atomic_helper_set_config(). 510 * 511 * Returns: 512 * Returns 0 on success, negative errno numbers on failure. 513 */ 514 int drm_crtc_helper_set_config(struct drm_mode_set *set, 515 struct drm_modeset_acquire_ctx *ctx) 516 { 517 struct drm_device *dev; 518 struct drm_crtc **save_encoder_crtcs, *new_crtc; 519 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder; 520 bool mode_changed = false; /* if true do a full mode set */ 521 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 522 struct drm_connector *connector; 523 struct drm_connector_list_iter conn_iter; 524 int count = 0, ro, fail = 0; 525 const struct drm_crtc_helper_funcs *crtc_funcs; 526 struct drm_mode_set save_set; 527 int ret; 528 int i; 529 530 DRM_DEBUG_KMS("\n"); 531 532 BUG_ON(!set); 533 BUG_ON(!set->crtc); 534 BUG_ON(!set->crtc->helper_private); 535 536 /* Enforce sane interface api - has been abused by the fb helper. */ 537 BUG_ON(!set->mode && set->fb); 538 BUG_ON(set->fb && set->num_connectors == 0); 539 540 crtc_funcs = set->crtc->helper_private; 541 542 if (!set->mode) 543 set->fb = NULL; 544 545 if (set->fb) { 546 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n", 547 set->crtc->base.id, set->crtc->name, 548 set->fb->base.id, 549 (int)set->num_connectors, set->x, set->y); 550 } else { 551 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n", 552 set->crtc->base.id, set->crtc->name); 553 drm_crtc_helper_disable(set->crtc); 554 return 0; 555 } 556 557 dev = set->crtc->dev; 558 559 drm_warn_on_modeset_not_all_locked(dev); 560 561 /* 562 * Allocate space for the backup of all (non-pointer) encoder and 563 * connector data. 564 */ 565 save_encoder_crtcs = kzalloc(dev->mode_config.num_encoder * 566 sizeof(struct drm_crtc *), GFP_KERNEL); 567 if (!save_encoder_crtcs) 568 return -ENOMEM; 569 570 save_connector_encoders = kzalloc(dev->mode_config.num_connector * 571 sizeof(struct drm_encoder *), GFP_KERNEL); 572 if (!save_connector_encoders) { 573 kfree(save_encoder_crtcs); 574 return -ENOMEM; 575 } 576 577 /* 578 * Copy data. Note that driver private data is not affected. 579 * Should anything bad happen only the expected state is 580 * restored, not the drivers personal bookkeeping. 581 */ 582 count = 0; 583 drm_for_each_encoder(encoder, dev) { 584 save_encoder_crtcs[count++] = encoder->crtc; 585 } 586 587 count = 0; 588 drm_connector_list_iter_begin(dev, &conn_iter); 589 drm_for_each_connector_iter(connector, &conn_iter) 590 save_connector_encoders[count++] = connector->encoder; 591 drm_connector_list_iter_end(&conn_iter); 592 593 save_set.crtc = set->crtc; 594 save_set.mode = &set->crtc->mode; 595 save_set.x = set->crtc->x; 596 save_set.y = set->crtc->y; 597 save_set.fb = set->crtc->primary->fb; 598 599 /* We should be able to check here if the fb has the same properties 600 * and then just flip_or_move it */ 601 if (set->crtc->primary->fb != set->fb) { 602 /* If we have no fb then treat it as a full mode set */ 603 if (set->crtc->primary->fb == NULL) { 604 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 605 mode_changed = true; 606 } else if (set->fb->format != set->crtc->primary->fb->format) { 607 mode_changed = true; 608 } else 609 fb_changed = true; 610 } 611 612 if (set->x != set->crtc->x || set->y != set->crtc->y) 613 fb_changed = true; 614 615 if (!drm_mode_equal(set->mode, &set->crtc->mode)) { 616 DRM_DEBUG_KMS("modes are different, full mode set\n"); 617 drm_mode_debug_printmodeline(&set->crtc->mode); 618 drm_mode_debug_printmodeline(set->mode); 619 mode_changed = true; 620 } 621 622 /* take a reference on all unbound connectors in set, reuse the 623 * already taken reference for bound connectors 624 */ 625 for (ro = 0; ro < set->num_connectors; ro++) { 626 if (set->connectors[ro]->encoder) 627 continue; 628 drm_connector_get(set->connectors[ro]); 629 } 630 631 /* a) traverse passed in connector list and get encoders for them */ 632 count = 0; 633 drm_connector_list_iter_begin(dev, &conn_iter); 634 drm_for_each_connector_iter(connector, &conn_iter) { 635 const struct drm_connector_helper_funcs *connector_funcs = 636 connector->helper_private; 637 new_encoder = connector->encoder; 638 for (ro = 0; ro < set->num_connectors; ro++) { 639 if (set->connectors[ro] == connector) { 640 new_encoder = connector_funcs->best_encoder(connector); 641 /* if we can't get an encoder for a connector 642 we are setting now - then fail */ 643 if (new_encoder == NULL) 644 /* don't break so fail path works correct */ 645 fail = 1; 646 647 if (connector->dpms != DRM_MODE_DPMS_ON) { 648 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 649 mode_changed = true; 650 } 651 652 break; 653 } 654 } 655 656 if (new_encoder != connector->encoder) { 657 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 658 mode_changed = true; 659 /* If the encoder is reused for another connector, then 660 * the appropriate crtc will be set later. 661 */ 662 if (connector->encoder) 663 connector->encoder->crtc = NULL; 664 connector->encoder = new_encoder; 665 } 666 } 667 drm_connector_list_iter_end(&conn_iter); 668 669 if (fail) { 670 ret = -EINVAL; 671 goto fail; 672 } 673 674 count = 0; 675 drm_connector_list_iter_begin(dev, &conn_iter); 676 drm_for_each_connector_iter(connector, &conn_iter) { 677 if (!connector->encoder) 678 continue; 679 680 if (connector->encoder->crtc == set->crtc) 681 new_crtc = NULL; 682 else 683 new_crtc = connector->encoder->crtc; 684 685 for (ro = 0; ro < set->num_connectors; ro++) { 686 if (set->connectors[ro] == connector) 687 new_crtc = set->crtc; 688 } 689 690 /* Make sure the new CRTC will work with the encoder */ 691 if (new_crtc && 692 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 693 ret = -EINVAL; 694 drm_connector_list_iter_end(&conn_iter); 695 goto fail; 696 } 697 if (new_crtc != connector->encoder->crtc) { 698 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 699 mode_changed = true; 700 connector->encoder->crtc = new_crtc; 701 } 702 if (new_crtc) { 703 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n", 704 connector->base.id, connector->name, 705 new_crtc->base.id, new_crtc->name); 706 } else { 707 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 708 connector->base.id, connector->name); 709 } 710 } 711 drm_connector_list_iter_end(&conn_iter); 712 713 /* mode_set_base is not a required function */ 714 if (fb_changed && !crtc_funcs->mode_set_base) 715 mode_changed = true; 716 717 if (mode_changed) { 718 if (drm_helper_crtc_in_use(set->crtc)) { 719 DRM_DEBUG_KMS("attempting to set mode from" 720 " userspace\n"); 721 drm_mode_debug_printmodeline(set->mode); 722 set->crtc->primary->fb = set->fb; 723 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 724 set->x, set->y, 725 save_set.fb)) { 726 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n", 727 set->crtc->base.id, set->crtc->name); 728 set->crtc->primary->fb = save_set.fb; 729 ret = -EINVAL; 730 goto fail; 731 } 732 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 733 for (i = 0; i < set->num_connectors; i++) { 734 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 735 set->connectors[i]->name); 736 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 737 } 738 } 739 __drm_helper_disable_unused_functions(dev); 740 } else if (fb_changed) { 741 set->crtc->x = set->x; 742 set->crtc->y = set->y; 743 set->crtc->primary->fb = set->fb; 744 ret = crtc_funcs->mode_set_base(set->crtc, 745 set->x, set->y, save_set.fb); 746 if (ret != 0) { 747 set->crtc->x = save_set.x; 748 set->crtc->y = save_set.y; 749 set->crtc->primary->fb = save_set.fb; 750 goto fail; 751 } 752 } 753 754 kfree(save_connector_encoders); 755 kfree(save_encoder_crtcs); 756 return 0; 757 758 fail: 759 /* Restore all previous data. */ 760 count = 0; 761 drm_for_each_encoder(encoder, dev) { 762 encoder->crtc = save_encoder_crtcs[count++]; 763 } 764 765 count = 0; 766 drm_connector_list_iter_begin(dev, &conn_iter); 767 drm_for_each_connector_iter(connector, &conn_iter) 768 connector->encoder = save_connector_encoders[count++]; 769 drm_connector_list_iter_end(&conn_iter); 770 771 /* after fail drop reference on all unbound connectors in set, let 772 * bound connectors keep their reference 773 */ 774 for (ro = 0; ro < set->num_connectors; ro++) { 775 if (set->connectors[ro]->encoder) 776 continue; 777 drm_connector_put(set->connectors[ro]); 778 } 779 780 /* Try to restore the config */ 781 if (mode_changed && 782 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 783 save_set.y, save_set.fb)) 784 DRM_ERROR("failed to restore config after modeset failure\n"); 785 786 kfree(save_connector_encoders); 787 kfree(save_encoder_crtcs); 788 return ret; 789 } 790 EXPORT_SYMBOL(drm_crtc_helper_set_config); 791 792 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 793 { 794 int dpms = DRM_MODE_DPMS_OFF; 795 struct drm_connector *connector; 796 struct drm_connector_list_iter conn_iter; 797 struct drm_device *dev = encoder->dev; 798 799 drm_connector_list_iter_begin(dev, &conn_iter); 800 drm_for_each_connector_iter(connector, &conn_iter) 801 if (connector->encoder == encoder) 802 if (connector->dpms < dpms) 803 dpms = connector->dpms; 804 drm_connector_list_iter_end(&conn_iter); 805 806 return dpms; 807 } 808 809 /* Helper which handles bridge ordering around encoder dpms */ 810 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 811 { 812 struct drm_bridge *bridge = encoder->bridge; 813 const struct drm_encoder_helper_funcs *encoder_funcs; 814 815 encoder_funcs = encoder->helper_private; 816 if (!encoder_funcs) 817 return; 818 819 if (mode == DRM_MODE_DPMS_ON) 820 drm_bridge_pre_enable(bridge); 821 else 822 drm_bridge_disable(bridge); 823 824 if (encoder_funcs->dpms) 825 encoder_funcs->dpms(encoder, mode); 826 827 if (mode == DRM_MODE_DPMS_ON) 828 drm_bridge_enable(bridge); 829 else 830 drm_bridge_post_disable(bridge); 831 } 832 833 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 834 { 835 int dpms = DRM_MODE_DPMS_OFF; 836 struct drm_connector *connector; 837 struct drm_connector_list_iter conn_iter; 838 struct drm_device *dev = crtc->dev; 839 840 drm_connector_list_iter_begin(dev, &conn_iter); 841 drm_for_each_connector_iter(connector, &conn_iter) 842 if (connector->encoder && connector->encoder->crtc == crtc) 843 if (connector->dpms < dpms) 844 dpms = connector->dpms; 845 drm_connector_list_iter_end(&conn_iter); 846 847 return dpms; 848 } 849 850 /** 851 * drm_helper_connector_dpms() - connector dpms helper implementation 852 * @connector: affected connector 853 * @mode: DPMS mode 854 * 855 * The drm_helper_connector_dpms() helper function implements the 856 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC 857 * helpers. 858 * 859 * This is the main helper function provided by the CRTC helper framework for 860 * implementing the DPMS connector attribute. It computes the new desired DPMS 861 * state for all encoders and CRTCs in the output mesh and calls the 862 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks 863 * provided by the driver. 864 * 865 * This function is deprecated. New drivers must implement atomic modeset 866 * support, where DPMS is handled in the DRM core. 867 * 868 * Returns: 869 * Always returns 0. 870 */ 871 int drm_helper_connector_dpms(struct drm_connector *connector, int mode) 872 { 873 struct drm_encoder *encoder = connector->encoder; 874 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 875 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 876 877 if (mode == connector->dpms) 878 return 0; 879 880 old_dpms = connector->dpms; 881 connector->dpms = mode; 882 883 if (encoder) 884 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 885 886 /* from off to on, do crtc then encoder */ 887 if (mode < old_dpms) { 888 if (crtc) { 889 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 890 if (crtc_funcs->dpms) 891 (*crtc_funcs->dpms) (crtc, 892 drm_helper_choose_crtc_dpms(crtc)); 893 } 894 if (encoder) 895 drm_helper_encoder_dpms(encoder, encoder_dpms); 896 } 897 898 /* from on to off, do encoder then crtc */ 899 if (mode > old_dpms) { 900 if (encoder) 901 drm_helper_encoder_dpms(encoder, encoder_dpms); 902 if (crtc) { 903 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 904 if (crtc_funcs->dpms) 905 (*crtc_funcs->dpms) (crtc, 906 drm_helper_choose_crtc_dpms(crtc)); 907 } 908 } 909 910 return 0; 911 } 912 EXPORT_SYMBOL(drm_helper_connector_dpms); 913 914 /** 915 * drm_helper_resume_force_mode - force-restore mode setting configuration 916 * @dev: drm_device which should be restored 917 * 918 * Drivers which use the mode setting helpers can use this function to 919 * force-restore the mode setting configuration e.g. on resume or when something 920 * else might have trampled over the hw state (like some overzealous old BIOSen 921 * tended to do). 922 * 923 * This helper doesn't provide a error return value since restoring the old 924 * config should never fail due to resource allocation issues since the driver 925 * has successfully set the restored configuration already. Hence this should 926 * boil down to the equivalent of a few dpms on calls, which also don't provide 927 * an error code. 928 * 929 * Drivers where simply restoring an old configuration again might fail (e.g. 930 * due to slight differences in allocating shared resources when the 931 * configuration is restored in a different order than when userspace set it up) 932 * need to use their own restore logic. 933 * 934 * This function is deprecated. New drivers should implement atomic mode- 935 * setting and use the atomic suspend/resume helpers. 936 * 937 * See also: 938 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() 939 */ 940 void drm_helper_resume_force_mode(struct drm_device *dev) 941 { 942 struct drm_crtc *crtc; 943 struct drm_encoder *encoder; 944 const struct drm_crtc_helper_funcs *crtc_funcs; 945 int encoder_dpms; 946 bool ret; 947 948 drm_modeset_lock_all(dev); 949 drm_for_each_crtc(crtc, dev) { 950 951 if (!crtc->enabled) 952 continue; 953 954 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 955 crtc->x, crtc->y, crtc->primary->fb); 956 957 /* Restoring the old config should never fail! */ 958 if (ret == false) 959 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 960 961 /* Turn off outputs that were already powered off */ 962 if (drm_helper_choose_crtc_dpms(crtc)) { 963 drm_for_each_encoder(encoder, dev) { 964 965 if(encoder->crtc != crtc) 966 continue; 967 968 encoder_dpms = drm_helper_choose_encoder_dpms( 969 encoder); 970 971 drm_helper_encoder_dpms(encoder, encoder_dpms); 972 } 973 974 crtc_funcs = crtc->helper_private; 975 if (crtc_funcs->dpms) 976 (*crtc_funcs->dpms) (crtc, 977 drm_helper_choose_crtc_dpms(crtc)); 978 } 979 } 980 981 /* disable the unused connectors while restoring the modesetting */ 982 __drm_helper_disable_unused_functions(dev); 983 drm_modeset_unlock_all(dev); 984 } 985 EXPORT_SYMBOL(drm_helper_resume_force_mode); 986 987 /** 988 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers 989 * @crtc: DRM CRTC 990 * @mode: DRM display mode which userspace requested 991 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks 992 * @x: x offset of the CRTC scanout area on the underlying framebuffer 993 * @y: y offset of the CRTC scanout area on the underlying framebuffer 994 * @old_fb: previous framebuffer 995 * 996 * This function implements a callback useable as the ->mode_set callback 997 * required by the CRTC helpers. Besides the atomic plane helper functions for 998 * the primary plane the driver must also provide the ->mode_set_nofb callback 999 * to set up the CRTC. 1000 * 1001 * This is a transitional helper useful for converting drivers to the atomic 1002 * interfaces. 1003 */ 1004 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode, 1005 struct drm_display_mode *adjusted_mode, int x, int y, 1006 struct drm_framebuffer *old_fb) 1007 { 1008 struct drm_crtc_state *crtc_state; 1009 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 1010 int ret; 1011 1012 if (crtc->funcs->atomic_duplicate_state) 1013 crtc_state = crtc->funcs->atomic_duplicate_state(crtc); 1014 else { 1015 if (!crtc->state) 1016 drm_atomic_helper_crtc_reset(crtc); 1017 1018 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc); 1019 } 1020 1021 if (!crtc_state) 1022 return -ENOMEM; 1023 1024 crtc_state->planes_changed = true; 1025 crtc_state->mode_changed = true; 1026 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode); 1027 if (ret) 1028 goto out; 1029 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode); 1030 1031 if (crtc_funcs->atomic_check) { 1032 ret = crtc_funcs->atomic_check(crtc, crtc_state); 1033 if (ret) 1034 goto out; 1035 } 1036 1037 swap(crtc->state, crtc_state); 1038 1039 crtc_funcs->mode_set_nofb(crtc); 1040 1041 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb); 1042 1043 out: 1044 if (crtc_state) { 1045 if (crtc->funcs->atomic_destroy_state) 1046 crtc->funcs->atomic_destroy_state(crtc, crtc_state); 1047 else 1048 drm_atomic_helper_crtc_destroy_state(crtc, crtc_state); 1049 } 1050 1051 return ret; 1052 } 1053 EXPORT_SYMBOL(drm_helper_crtc_mode_set); 1054 1055 /** 1056 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers 1057 * @crtc: DRM CRTC 1058 * @x: x offset of the CRTC scanout area on the underlying framebuffer 1059 * @y: y offset of the CRTC scanout area on the underlying framebuffer 1060 * @old_fb: previous framebuffer 1061 * 1062 * This function implements a callback useable as the ->mode_set_base used 1063 * required by the CRTC helpers. The driver must provide the atomic plane helper 1064 * functions for the primary plane. 1065 * 1066 * This is a transitional helper useful for converting drivers to the atomic 1067 * interfaces. 1068 */ 1069 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y, 1070 struct drm_framebuffer *old_fb) 1071 { 1072 struct drm_plane_state *plane_state; 1073 struct drm_plane *plane = crtc->primary; 1074 1075 if (plane->funcs->atomic_duplicate_state) 1076 plane_state = plane->funcs->atomic_duplicate_state(plane); 1077 else { 1078 if (!plane->state) 1079 drm_atomic_helper_plane_reset(plane); 1080 1081 plane_state = drm_atomic_helper_plane_duplicate_state(plane); 1082 } 1083 if (!plane_state) 1084 return -ENOMEM; 1085 plane_state->plane = plane; 1086 1087 plane_state->crtc = crtc; 1088 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb); 1089 plane_state->crtc_x = 0; 1090 plane_state->crtc_y = 0; 1091 plane_state->crtc_h = crtc->mode.vdisplay; 1092 plane_state->crtc_w = crtc->mode.hdisplay; 1093 plane_state->src_x = x << 16; 1094 plane_state->src_y = y << 16; 1095 plane_state->src_h = crtc->mode.vdisplay << 16; 1096 plane_state->src_w = crtc->mode.hdisplay << 16; 1097 1098 return drm_plane_helper_commit(plane, plane_state, old_fb); 1099 } 1100 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base); 1101