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_fourcc.h> 40#include <drm/drm_crtc_helper.h> 41#include <drm/drm_fb_helper.h> 42#include <drm/drm_plane_helper.h> 43#include <drm/drm_atomic_helper.h> 44#include <drm/drm_edid.h> 45 46/** 47 * DOC: overview 48 * 49 * The CRTC modeset helper library provides a default set_config implementation 50 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using 51 * the same callbacks which drivers can use to e.g. restore the modeset 52 * configuration on resume with drm_helper_resume_force_mode(). 53 * 54 * The driver callbacks are mostly compatible with the atomic modeset helpers, 55 * except for the handling of the primary plane: Atomic helpers require that the 56 * primary plane is implemented as a real standalone plane and not directly tied 57 * to the CRTC state. For easier transition this library provides functions to 58 * implement the old semantics required by the CRTC helpers using the new plane 59 * and atomic helper callbacks. 60 * 61 * Drivers are strongly urged to convert to the atomic helpers (by way of first 62 * converting to the plane helpers). New drivers must not use these functions 63 * but need to implement the atomic interface instead, potentially using the 64 * atomic helpers for that. 65 */ 66MODULE_AUTHOR("David Airlie, Jesse Barnes"); 67MODULE_DESCRIPTION("DRM KMS helper"); 68MODULE_LICENSE("GPL and additional rights"); 69 70/** 71 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the 72 * connector list 73 * @dev: drm device to operate on 74 * 75 * Some userspace presumes that the first connected connector is the main 76 * display, where it's supposed to display e.g. the login screen. For 77 * laptops, this should be the main panel. Use this function to sort all 78 * (eDP/LVDS) panels to the front of the connector list, instead of 79 * painstakingly trying to initialize them in the right order. 80 */ 81void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) 82{ 83 struct drm_connector *connector, *tmp; 84 struct list_head panel_list; 85 86 INIT_LIST_HEAD(&panel_list); 87 88 list_for_each_entry_safe(connector, tmp, 89 &dev->mode_config.connector_list, head) { 90 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS || 91 connector->connector_type == DRM_MODE_CONNECTOR_eDP) 92 list_move_tail(&connector->head, &panel_list); 93 } 94 95 list_splice(&panel_list, &dev->mode_config.connector_list); 96} 97EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 98 99/** 100 * drm_helper_encoder_in_use - check if a given encoder is in use 101 * @encoder: encoder to check 102 * 103 * Checks whether @encoder is with the current mode setting output configuration 104 * in use by any connector. This doesn't mean that it is actually enabled since 105 * the DPMS state is tracked separately. 106 * 107 * Returns: 108 * True if @encoder is used, false otherwise. 109 */ 110bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 111{ 112 struct drm_connector *connector; 113 struct drm_device *dev = encoder->dev; 114 115 /* 116 * We can expect this mutex to be locked if we are not panicking. 117 * Locking is currently fubar in the panic handler. 118 */ 119 if (!oops_in_progress) { 120 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 121 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 122 } 123 124 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 125 if (connector->encoder == encoder) 126 return true; 127 return false; 128} 129EXPORT_SYMBOL(drm_helper_encoder_in_use); 130 131/** 132 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 133 * @crtc: CRTC to check 134 * 135 * Checks whether @crtc is with the current mode setting output configuration 136 * in use by any connector. This doesn't mean that it is actually enabled since 137 * the DPMS state is tracked separately. 138 * 139 * Returns: 140 * True if @crtc is used, false otherwise. 141 */ 142bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 143{ 144 struct drm_encoder *encoder; 145 struct drm_device *dev = crtc->dev; 146 147 /* 148 * We can expect this mutex to be locked if we are not panicking. 149 * Locking is currently fubar in the panic handler. 150 */ 151 if (!oops_in_progress) 152 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 153 154 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 155 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 156 return true; 157 return false; 158} 159EXPORT_SYMBOL(drm_helper_crtc_in_use); 160 161static void 162drm_encoder_disable(struct drm_encoder *encoder) 163{ 164 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 165 166 if (encoder->bridge) 167 encoder->bridge->funcs->disable(encoder->bridge); 168 169 if (encoder_funcs->disable) 170 (*encoder_funcs->disable)(encoder); 171 else 172 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 173 174 if (encoder->bridge) 175 encoder->bridge->funcs->post_disable(encoder->bridge); 176} 177 178static void __drm_helper_disable_unused_functions(struct drm_device *dev) 179{ 180 struct drm_encoder *encoder; 181 struct drm_crtc *crtc; 182 183 drm_warn_on_modeset_not_all_locked(dev); 184 185 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 186 if (!drm_helper_encoder_in_use(encoder)) { 187 drm_encoder_disable(encoder); 188 /* disconnect encoder from any connector */ 189 encoder->crtc = NULL; 190 } 191 } 192 193 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 194 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 195 crtc->enabled = drm_helper_crtc_in_use(crtc); 196 if (!crtc->enabled) { 197 if (crtc_funcs->disable) 198 (*crtc_funcs->disable)(crtc); 199 else 200 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 201 crtc->primary->fb = NULL; 202 } 203 } 204} 205 206/** 207 * drm_helper_disable_unused_functions - disable unused objects 208 * @dev: DRM device 209 * 210 * This function walks through the entire mode setting configuration of @dev. It 211 * will remove any crtc links of unused encoders and encoder links of 212 * disconnected connectors. Then it will disable all unused encoders and crtcs 213 * either by calling their disable callback if available or by calling their 214 * dpms callback with DRM_MODE_DPMS_OFF. 215 */ 216void drm_helper_disable_unused_functions(struct drm_device *dev) 217{ 218 drm_modeset_lock_all(dev); 219 __drm_helper_disable_unused_functions(dev); 220 drm_modeset_unlock_all(dev); 221} 222EXPORT_SYMBOL(drm_helper_disable_unused_functions); 223 224/* 225 * Check the CRTC we're going to map each output to vs. its current 226 * CRTC. If they don't match, we have to disable the output and the CRTC 227 * since the driver will have to re-route things. 228 */ 229static void 230drm_crtc_prepare_encoders(struct drm_device *dev) 231{ 232 const struct drm_encoder_helper_funcs *encoder_funcs; 233 struct drm_encoder *encoder; 234 235 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 236 encoder_funcs = encoder->helper_private; 237 /* Disable unused encoders */ 238 if (encoder->crtc == NULL) 239 drm_encoder_disable(encoder); 240 /* Disable encoders whose CRTC is about to change */ 241 if (encoder_funcs->get_crtc && 242 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 243 drm_encoder_disable(encoder); 244 } 245} 246 247/** 248 * drm_crtc_helper_set_mode - internal helper to set a mode 249 * @crtc: CRTC to program 250 * @mode: mode to use 251 * @x: horizontal offset into the surface 252 * @y: vertical offset into the surface 253 * @old_fb: old framebuffer, for cleanup 254 * 255 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 256 * to fixup or reject the mode prior to trying to set it. This is an internal 257 * helper that drivers could e.g. use to update properties that require the 258 * entire output pipe to be disabled and re-enabled in a new configuration. For 259 * example for changing whether audio is enabled on a hdmi link or for changing 260 * panel fitter or dither attributes. It is also called by the 261 * drm_crtc_helper_set_config() helper function to drive the mode setting 262 * sequence. 263 * 264 * Returns: 265 * True if the mode was set successfully, false otherwise. 266 */ 267bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 268 struct drm_display_mode *mode, 269 int x, int y, 270 struct drm_framebuffer *old_fb) 271{ 272 struct drm_device *dev = crtc->dev; 273 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 274 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 275 const struct drm_encoder_helper_funcs *encoder_funcs; 276 int saved_x, saved_y; 277 bool saved_enabled; 278 struct drm_encoder *encoder; 279 bool ret = true; 280 281 drm_warn_on_modeset_not_all_locked(dev); 282 283 saved_enabled = crtc->enabled; 284 crtc->enabled = drm_helper_crtc_in_use(crtc); 285 if (!crtc->enabled) 286 return true; 287 288 adjusted_mode = drm_mode_duplicate(dev, mode); 289 if (!adjusted_mode) { 290 crtc->enabled = saved_enabled; 291 return false; 292 } 293 294 saved_mode = crtc->mode; 295 saved_hwmode = crtc->hwmode; 296 saved_x = crtc->x; 297 saved_y = crtc->y; 298 299 /* Update crtc values up front so the driver can rely on them for mode 300 * setting. 301 */ 302 crtc->mode = *mode; 303 crtc->x = x; 304 crtc->y = y; 305 306 /* Pass our mode to the connectors and the CRTC to give them a chance to 307 * adjust it according to limitations or connector properties, and also 308 * a chance to reject the mode entirely. 309 */ 310 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 311 312 if (encoder->crtc != crtc) 313 continue; 314 315 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) { 316 ret = encoder->bridge->funcs->mode_fixup( 317 encoder->bridge, mode, adjusted_mode); 318 if (!ret) { 319 DRM_DEBUG_KMS("Bridge fixup failed\n"); 320 goto done; 321 } 322 } 323 324 encoder_funcs = encoder->helper_private; 325 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 326 adjusted_mode))) { 327 DRM_DEBUG_KMS("Encoder fixup failed\n"); 328 goto done; 329 } 330 } 331 332 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) { 333 DRM_DEBUG_KMS("CRTC fixup failed\n"); 334 goto done; 335 } 336 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id); 337 338 crtc->hwmode = *adjusted_mode; 339 340 /* Prepare the encoders and CRTCs before setting the mode. */ 341 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 342 343 if (encoder->crtc != crtc) 344 continue; 345 346 if (encoder->bridge) 347 encoder->bridge->funcs->disable(encoder->bridge); 348 349 encoder_funcs = encoder->helper_private; 350 /* Disable the encoders as the first thing we do. */ 351 encoder_funcs->prepare(encoder); 352 353 if (encoder->bridge) 354 encoder->bridge->funcs->post_disable(encoder->bridge); 355 } 356 357 drm_crtc_prepare_encoders(dev); 358 359 crtc_funcs->prepare(crtc); 360 361 /* Set up the DPLL and any encoders state that needs to adjust or depend 362 * on the DPLL. 363 */ 364 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 365 if (!ret) 366 goto done; 367 368 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 369 370 if (encoder->crtc != crtc) 371 continue; 372 373 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 374 encoder->base.id, encoder->name, 375 mode->base.id, mode->name); 376 encoder_funcs = encoder->helper_private; 377 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 378 379 if (encoder->bridge && encoder->bridge->funcs->mode_set) 380 encoder->bridge->funcs->mode_set(encoder->bridge, mode, 381 adjusted_mode); 382 } 383 384 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 385 crtc_funcs->commit(crtc); 386 387 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 388 389 if (encoder->crtc != crtc) 390 continue; 391 392 if (encoder->bridge) 393 encoder->bridge->funcs->pre_enable(encoder->bridge); 394 395 encoder_funcs = encoder->helper_private; 396 encoder_funcs->commit(encoder); 397 398 if (encoder->bridge) 399 encoder->bridge->funcs->enable(encoder->bridge); 400 } 401 402 /* Calculate and store various constants which 403 * are later needed by vblank and swap-completion 404 * timestamping. They are derived from true hwmode. 405 */ 406 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 407 408 /* FIXME: add subpixel order */ 409done: 410 drm_mode_destroy(dev, adjusted_mode); 411 if (!ret) { 412 crtc->enabled = saved_enabled; 413 crtc->mode = saved_mode; 414 crtc->hwmode = saved_hwmode; 415 crtc->x = saved_x; 416 crtc->y = saved_y; 417 } 418 419 return ret; 420} 421EXPORT_SYMBOL(drm_crtc_helper_set_mode); 422 423static void 424drm_crtc_helper_disable(struct drm_crtc *crtc) 425{ 426 struct drm_device *dev = crtc->dev; 427 struct drm_connector *connector; 428 struct drm_encoder *encoder; 429 430 /* Decouple all encoders and their attached connectors from this crtc */ 431 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 432 if (encoder->crtc != crtc) 433 continue; 434 435 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 436 if (connector->encoder != encoder) 437 continue; 438 439 connector->encoder = NULL; 440 441 /* 442 * drm_helper_disable_unused_functions() ought to be 443 * doing this, but since we've decoupled the encoder 444 * from the connector above, the required connection 445 * between them is henceforth no longer available. 446 */ 447 connector->dpms = DRM_MODE_DPMS_OFF; 448 } 449 } 450 451 __drm_helper_disable_unused_functions(dev); 452} 453 454/** 455 * drm_crtc_helper_set_config - set a new config from userspace 456 * @set: mode set configuration 457 * 458 * Setup a new configuration, provided by the upper layers (either an ioctl call 459 * from userspace or internally e.g. from the fbdev support code) in @set, and 460 * enable it. This is the main helper functions for drivers that implement 461 * kernel mode setting with the crtc helper functions and the assorted 462 * ->prepare(), ->modeset() and ->commit() helper callbacks. 463 * 464 * Returns: 465 * Returns 0 on success, negative errno numbers on failure. 466 */ 467int drm_crtc_helper_set_config(struct drm_mode_set *set) 468{ 469 struct drm_device *dev; 470 struct drm_crtc *new_crtc; 471 struct drm_encoder *save_encoders, *new_encoder, *encoder; 472 bool mode_changed = false; /* if true do a full mode set */ 473 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 474 struct drm_connector *save_connectors, *connector; 475 int count = 0, ro, fail = 0; 476 const struct drm_crtc_helper_funcs *crtc_funcs; 477 struct drm_mode_set save_set; 478 int ret; 479 int i; 480 481 DRM_DEBUG_KMS("\n"); 482 483 BUG_ON(!set); 484 BUG_ON(!set->crtc); 485 BUG_ON(!set->crtc->helper_private); 486 487 /* Enforce sane interface api - has been abused by the fb helper. */ 488 BUG_ON(!set->mode && set->fb); 489 BUG_ON(set->fb && set->num_connectors == 0); 490 491 crtc_funcs = set->crtc->helper_private; 492 493 if (!set->mode) 494 set->fb = NULL; 495 496 if (set->fb) { 497 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n", 498 set->crtc->base.id, set->fb->base.id, 499 (int)set->num_connectors, set->x, set->y); 500 } else { 501 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id); 502 drm_crtc_helper_disable(set->crtc); 503 return 0; 504 } 505 506 dev = set->crtc->dev; 507 508 drm_warn_on_modeset_not_all_locked(dev); 509 510 /* 511 * Allocate space for the backup of all (non-pointer) encoder and 512 * connector data. 513 */ 514 save_encoders = kzalloc(dev->mode_config.num_encoder * 515 sizeof(struct drm_encoder), GFP_KERNEL); 516 if (!save_encoders) 517 return -ENOMEM; 518 519 save_connectors = kzalloc(dev->mode_config.num_connector * 520 sizeof(struct drm_connector), GFP_KERNEL); 521 if (!save_connectors) { 522 kfree(save_encoders); 523 return -ENOMEM; 524 } 525 526 /* 527 * Copy data. Note that driver private data is not affected. 528 * Should anything bad happen only the expected state is 529 * restored, not the drivers personal bookkeeping. 530 */ 531 count = 0; 532 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 533 save_encoders[count++] = *encoder; 534 } 535 536 count = 0; 537 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 538 save_connectors[count++] = *connector; 539 } 540 541 save_set.crtc = set->crtc; 542 save_set.mode = &set->crtc->mode; 543 save_set.x = set->crtc->x; 544 save_set.y = set->crtc->y; 545 save_set.fb = set->crtc->primary->fb; 546 547 /* We should be able to check here if the fb has the same properties 548 * and then just flip_or_move it */ 549 if (set->crtc->primary->fb != set->fb) { 550 /* If we have no fb then treat it as a full mode set */ 551 if (set->crtc->primary->fb == NULL) { 552 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 553 mode_changed = true; 554 } else if (set->fb == NULL) { 555 mode_changed = true; 556 } else if (set->fb->pixel_format != 557 set->crtc->primary->fb->pixel_format) { 558 mode_changed = true; 559 } else 560 fb_changed = true; 561 } 562 563 if (set->x != set->crtc->x || set->y != set->crtc->y) 564 fb_changed = true; 565 566 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) { 567 DRM_DEBUG_KMS("modes are different, full mode set\n"); 568 drm_mode_debug_printmodeline(&set->crtc->mode); 569 drm_mode_debug_printmodeline(set->mode); 570 mode_changed = true; 571 } 572 573 /* a) traverse passed in connector list and get encoders for them */ 574 count = 0; 575 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 576 const struct drm_connector_helper_funcs *connector_funcs = 577 connector->helper_private; 578 new_encoder = connector->encoder; 579 for (ro = 0; ro < set->num_connectors; ro++) { 580 if (set->connectors[ro] == connector) { 581 new_encoder = connector_funcs->best_encoder(connector); 582 /* if we can't get an encoder for a connector 583 we are setting now - then fail */ 584 if (new_encoder == NULL) 585 /* don't break so fail path works correct */ 586 fail = 1; 587 588 if (connector->dpms != DRM_MODE_DPMS_ON) { 589 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 590 mode_changed = true; 591 } 592 593 break; 594 } 595 } 596 597 if (new_encoder != connector->encoder) { 598 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 599 mode_changed = true; 600 /* If the encoder is reused for another connector, then 601 * the appropriate crtc will be set later. 602 */ 603 if (connector->encoder) 604 connector->encoder->crtc = NULL; 605 connector->encoder = new_encoder; 606 } 607 } 608 609 if (fail) { 610 ret = -EINVAL; 611 goto fail; 612 } 613 614 count = 0; 615 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 616 if (!connector->encoder) 617 continue; 618 619 if (connector->encoder->crtc == set->crtc) 620 new_crtc = NULL; 621 else 622 new_crtc = connector->encoder->crtc; 623 624 for (ro = 0; ro < set->num_connectors; ro++) { 625 if (set->connectors[ro] == connector) 626 new_crtc = set->crtc; 627 } 628 629 /* Make sure the new CRTC will work with the encoder */ 630 if (new_crtc && 631 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 632 ret = -EINVAL; 633 goto fail; 634 } 635 if (new_crtc != connector->encoder->crtc) { 636 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 637 mode_changed = true; 638 connector->encoder->crtc = new_crtc; 639 } 640 if (new_crtc) { 641 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n", 642 connector->base.id, connector->name, 643 new_crtc->base.id); 644 } else { 645 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 646 connector->base.id, connector->name); 647 } 648 } 649 650 /* mode_set_base is not a required function */ 651 if (fb_changed && !crtc_funcs->mode_set_base) 652 mode_changed = true; 653 654 if (mode_changed) { 655 if (drm_helper_crtc_in_use(set->crtc)) { 656 DRM_DEBUG_KMS("attempting to set mode from" 657 " userspace\n"); 658 drm_mode_debug_printmodeline(set->mode); 659 set->crtc->primary->fb = set->fb; 660 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 661 set->x, set->y, 662 save_set.fb)) { 663 DRM_ERROR("failed to set mode on [CRTC:%d]\n", 664 set->crtc->base.id); 665 set->crtc->primary->fb = save_set.fb; 666 ret = -EINVAL; 667 goto fail; 668 } 669 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 670 for (i = 0; i < set->num_connectors; i++) { 671 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 672 set->connectors[i]->name); 673 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 674 } 675 } 676 __drm_helper_disable_unused_functions(dev); 677 } else if (fb_changed) { 678 set->crtc->x = set->x; 679 set->crtc->y = set->y; 680 set->crtc->primary->fb = set->fb; 681 ret = crtc_funcs->mode_set_base(set->crtc, 682 set->x, set->y, save_set.fb); 683 if (ret != 0) { 684 set->crtc->x = save_set.x; 685 set->crtc->y = save_set.y; 686 set->crtc->primary->fb = save_set.fb; 687 goto fail; 688 } 689 } 690 691 kfree(save_connectors); 692 kfree(save_encoders); 693 return 0; 694 695fail: 696 /* Restore all previous data. */ 697 count = 0; 698 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 699 *encoder = save_encoders[count++]; 700 } 701 702 count = 0; 703 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 704 *connector = save_connectors[count++]; 705 } 706 707 /* Try to restore the config */ 708 if (mode_changed && 709 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 710 save_set.y, save_set.fb)) 711 DRM_ERROR("failed to restore config after modeset failure\n"); 712 713 kfree(save_connectors); 714 kfree(save_encoders); 715 return ret; 716} 717EXPORT_SYMBOL(drm_crtc_helper_set_config); 718 719static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 720{ 721 int dpms = DRM_MODE_DPMS_OFF; 722 struct drm_connector *connector; 723 struct drm_device *dev = encoder->dev; 724 725 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 726 if (connector->encoder == encoder) 727 if (connector->dpms < dpms) 728 dpms = connector->dpms; 729 return dpms; 730} 731 732/* Helper which handles bridge ordering around encoder dpms */ 733static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 734{ 735 struct drm_bridge *bridge = encoder->bridge; 736 const struct drm_encoder_helper_funcs *encoder_funcs; 737 738 if (bridge) { 739 if (mode == DRM_MODE_DPMS_ON) 740 bridge->funcs->pre_enable(bridge); 741 else 742 bridge->funcs->disable(bridge); 743 } 744 745 encoder_funcs = encoder->helper_private; 746 if (encoder_funcs->dpms) 747 encoder_funcs->dpms(encoder, mode); 748 749 if (bridge) { 750 if (mode == DRM_MODE_DPMS_ON) 751 bridge->funcs->enable(bridge); 752 else 753 bridge->funcs->post_disable(bridge); 754 } 755} 756 757static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 758{ 759 int dpms = DRM_MODE_DPMS_OFF; 760 struct drm_connector *connector; 761 struct drm_device *dev = crtc->dev; 762 763 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 764 if (connector->encoder && connector->encoder->crtc == crtc) 765 if (connector->dpms < dpms) 766 dpms = connector->dpms; 767 return dpms; 768} 769 770/** 771 * drm_helper_connector_dpms() - connector dpms helper implementation 772 * @connector: affected connector 773 * @mode: DPMS mode 774 * 775 * This is the main helper function provided by the crtc helper framework for 776 * implementing the DPMS connector attribute. It computes the new desired DPMS 777 * state for all encoders and crtcs in the output mesh and calls the ->dpms() 778 * callback provided by the driver appropriately. 779 */ 780void drm_helper_connector_dpms(struct drm_connector *connector, int mode) 781{ 782 struct drm_encoder *encoder = connector->encoder; 783 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 784 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 785 786 if (mode == connector->dpms) 787 return; 788 789 old_dpms = connector->dpms; 790 connector->dpms = mode; 791 792 if (encoder) 793 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 794 795 /* from off to on, do crtc then encoder */ 796 if (mode < old_dpms) { 797 if (crtc) { 798 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 799 if (crtc_funcs->dpms) 800 (*crtc_funcs->dpms) (crtc, 801 drm_helper_choose_crtc_dpms(crtc)); 802 } 803 if (encoder) 804 drm_helper_encoder_dpms(encoder, encoder_dpms); 805 } 806 807 /* from on to off, do encoder then crtc */ 808 if (mode > old_dpms) { 809 if (encoder) 810 drm_helper_encoder_dpms(encoder, encoder_dpms); 811 if (crtc) { 812 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 813 if (crtc_funcs->dpms) 814 (*crtc_funcs->dpms) (crtc, 815 drm_helper_choose_crtc_dpms(crtc)); 816 } 817 } 818 819 return; 820} 821EXPORT_SYMBOL(drm_helper_connector_dpms); 822 823/** 824 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata 825 * @fb: drm_framebuffer object to fill out 826 * @mode_cmd: metadata from the userspace fb creation request 827 * 828 * This helper can be used in a drivers fb_create callback to pre-fill the fb's 829 * metadata fields. 830 */ 831void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 832 struct drm_mode_fb_cmd2 *mode_cmd) 833{ 834 int i; 835 836 fb->width = mode_cmd->width; 837 fb->height = mode_cmd->height; 838 for (i = 0; i < 4; i++) { 839 fb->pitches[i] = mode_cmd->pitches[i]; 840 fb->offsets[i] = mode_cmd->offsets[i]; 841 fb->modifier[i] = mode_cmd->modifier[i]; 842 } 843 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, 844 &fb->bits_per_pixel); 845 fb->pixel_format = mode_cmd->pixel_format; 846 fb->flags = mode_cmd->flags; 847} 848EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 849 850/** 851 * drm_helper_resume_force_mode - force-restore mode setting configuration 852 * @dev: drm_device which should be restored 853 * 854 * Drivers which use the mode setting helpers can use this function to 855 * force-restore the mode setting configuration e.g. on resume or when something 856 * else might have trampled over the hw state (like some overzealous old BIOSen 857 * tended to do). 858 * 859 * This helper doesn't provide a error return value since restoring the old 860 * config should never fail due to resource allocation issues since the driver 861 * has successfully set the restored configuration already. Hence this should 862 * boil down to the equivalent of a few dpms on calls, which also don't provide 863 * an error code. 864 * 865 * Drivers where simply restoring an old configuration again might fail (e.g. 866 * due to slight differences in allocating shared resources when the 867 * configuration is restored in a different order than when userspace set it up) 868 * need to use their own restore logic. 869 */ 870void drm_helper_resume_force_mode(struct drm_device *dev) 871{ 872 struct drm_crtc *crtc; 873 struct drm_encoder *encoder; 874 const struct drm_crtc_helper_funcs *crtc_funcs; 875 int encoder_dpms; 876 bool ret; 877 878 drm_modeset_lock_all(dev); 879 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 880 881 if (!crtc->enabled) 882 continue; 883 884 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 885 crtc->x, crtc->y, crtc->primary->fb); 886 887 /* Restoring the old config should never fail! */ 888 if (ret == false) 889 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 890 891 /* Turn off outputs that were already powered off */ 892 if (drm_helper_choose_crtc_dpms(crtc)) { 893 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 894 895 if(encoder->crtc != crtc) 896 continue; 897 898 encoder_dpms = drm_helper_choose_encoder_dpms( 899 encoder); 900 901 drm_helper_encoder_dpms(encoder, encoder_dpms); 902 } 903 904 crtc_funcs = crtc->helper_private; 905 if (crtc_funcs->dpms) 906 (*crtc_funcs->dpms) (crtc, 907 drm_helper_choose_crtc_dpms(crtc)); 908 } 909 } 910 911 /* disable the unused connectors while restoring the modesetting */ 912 __drm_helper_disable_unused_functions(dev); 913 drm_modeset_unlock_all(dev); 914} 915EXPORT_SYMBOL(drm_helper_resume_force_mode); 916 917/** 918 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers 919 * @crtc: DRM CRTC 920 * @mode: DRM display mode which userspace requested 921 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks 922 * @x: x offset of the CRTC scanout area on the underlying framebuffer 923 * @y: y offset of the CRTC scanout area on the underlying framebuffer 924 * @old_fb: previous framebuffer 925 * 926 * This function implements a callback useable as the ->mode_set callback 927 * required by the crtc helpers. Besides the atomic plane helper functions for 928 * the primary plane the driver must also provide the ->mode_set_nofb callback 929 * to set up the crtc. 930 * 931 * This is a transitional helper useful for converting drivers to the atomic 932 * interfaces. 933 */ 934int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode, 935 struct drm_display_mode *adjusted_mode, int x, int y, 936 struct drm_framebuffer *old_fb) 937{ 938 struct drm_crtc_state *crtc_state; 939 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 940 int ret; 941 942 if (crtc->funcs->atomic_duplicate_state) 943 crtc_state = crtc->funcs->atomic_duplicate_state(crtc); 944 else if (crtc->state) 945 crtc_state = kmemdup(crtc->state, sizeof(*crtc_state), 946 GFP_KERNEL); 947 else 948 crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL); 949 if (!crtc_state) 950 return -ENOMEM; 951 crtc_state->crtc = crtc; 952 953 crtc_state->enable = true; 954 crtc_state->planes_changed = true; 955 crtc_state->mode_changed = true; 956 drm_mode_copy(&crtc_state->mode, mode); 957 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode); 958 959 if (crtc_funcs->atomic_check) { 960 ret = crtc_funcs->atomic_check(crtc, crtc_state); 961 if (ret) { 962 kfree(crtc_state); 963 964 return ret; 965 } 966 } 967 968 swap(crtc->state, crtc_state); 969 970 crtc_funcs->mode_set_nofb(crtc); 971 972 if (crtc_state) { 973 if (crtc->funcs->atomic_destroy_state) 974 crtc->funcs->atomic_destroy_state(crtc, crtc_state); 975 else 976 kfree(crtc_state); 977 } 978 979 return drm_helper_crtc_mode_set_base(crtc, x, y, old_fb); 980} 981EXPORT_SYMBOL(drm_helper_crtc_mode_set); 982 983/** 984 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers 985 * @crtc: DRM CRTC 986 * @x: x offset of the CRTC scanout area on the underlying framebuffer 987 * @y: y offset of the CRTC scanout area on the underlying framebuffer 988 * @old_fb: previous framebuffer 989 * 990 * This function implements a callback useable as the ->mode_set_base used 991 * required by the crtc helpers. The driver must provide the atomic plane helper 992 * functions for the primary plane. 993 * 994 * This is a transitional helper useful for converting drivers to the atomic 995 * interfaces. 996 */ 997int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y, 998 struct drm_framebuffer *old_fb) 999{ 1000 struct drm_plane_state *plane_state; 1001 struct drm_plane *plane = crtc->primary; 1002 1003 if (plane->funcs->atomic_duplicate_state) 1004 plane_state = plane->funcs->atomic_duplicate_state(plane); 1005 else if (plane->state) 1006 plane_state = drm_atomic_helper_plane_duplicate_state(plane); 1007 else 1008 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL); 1009 if (!plane_state) 1010 return -ENOMEM; 1011 plane_state->plane = plane; 1012 1013 plane_state->crtc = crtc; 1014 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb); 1015 plane_state->crtc_x = 0; 1016 plane_state->crtc_y = 0; 1017 plane_state->crtc_h = crtc->mode.vdisplay; 1018 plane_state->crtc_w = crtc->mode.hdisplay; 1019 plane_state->src_x = x << 16; 1020 plane_state->src_y = y << 16; 1021 plane_state->src_h = crtc->mode.vdisplay << 16; 1022 plane_state->src_w = crtc->mode.hdisplay << 16; 1023 1024 return drm_plane_helper_commit(plane, plane_state, old_fb); 1025} 1026EXPORT_SYMBOL(drm_helper_crtc_mode_set_base); 1027