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