1 /* 2 * Copyright (c) 2006-2008 Intel Corporation 3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> 4 * 5 * DRM core CRTC related functions 6 * 7 * Permission to use, copy, modify, distribute, and sell this software and its 8 * documentation for any purpose is hereby granted without fee, provided that 9 * the above copyright notice appear in all copies and that both that copyright 10 * notice and this permission notice appear in supporting documentation, and 11 * that the name of the copyright holders not be used in advertising or 12 * publicity pertaining to distribution of the software without specific, 13 * written prior permission. The copyright holders make no representations 14 * about the suitability of this software for any purpose. It is provided "as 15 * is" without express or implied warranty. 16 * 17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 23 * OF THIS SOFTWARE. 24 * 25 * Authors: 26 * Keith Packard 27 * Eric Anholt <eric@anholt.net> 28 * Dave Airlie <airlied@linux.ie> 29 * Jesse Barnes <jesse.barnes@intel.com> 30 */ 31 32 #include <linux/export.h> 33 #include <linux/moduleparam.h> 34 35 #include <drm/drmP.h> 36 #include <drm/drm_crtc.h> 37 #include <drm/drm_fourcc.h> 38 #include <drm/drm_crtc_helper.h> 39 #include <drm/drm_fb_helper.h> 40 #include <drm/drm_edid.h> 41 42 MODULE_AUTHOR("David Airlie, Jesse Barnes"); 43 MODULE_DESCRIPTION("DRM KMS helper"); 44 MODULE_LICENSE("GPL and additional rights"); 45 46 /** 47 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the 48 * connector list 49 * @dev: drm device to operate on 50 * 51 * Some userspace presumes that the first connected connector is the main 52 * display, where it's supposed to display e.g. the login screen. For 53 * laptops, this should be the main panel. Use this function to sort all 54 * (eDP/LVDS) panels to the front of the connector list, instead of 55 * painstakingly trying to initialize them in the right order. 56 */ 57 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) 58 { 59 struct drm_connector *connector, *tmp; 60 struct list_head panel_list; 61 62 INIT_LIST_HEAD(&panel_list); 63 64 list_for_each_entry_safe(connector, tmp, 65 &dev->mode_config.connector_list, head) { 66 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS || 67 connector->connector_type == DRM_MODE_CONNECTOR_eDP) 68 list_move_tail(&connector->head, &panel_list); 69 } 70 71 list_splice(&panel_list, &dev->mode_config.connector_list); 72 } 73 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 74 75 static bool drm_kms_helper_poll = true; 76 module_param_named(poll, drm_kms_helper_poll, bool, 0600); 77 78 static void drm_mode_validate_flag(struct drm_connector *connector, 79 int flags) 80 { 81 struct drm_display_mode *mode; 82 83 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE | 84 DRM_MODE_FLAG_3D_MASK)) 85 return; 86 87 list_for_each_entry(mode, &connector->modes, head) { 88 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && 89 !(flags & DRM_MODE_FLAG_INTERLACE)) 90 mode->status = MODE_NO_INTERLACE; 91 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && 92 !(flags & DRM_MODE_FLAG_DBLSCAN)) 93 mode->status = MODE_NO_DBLESCAN; 94 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && 95 !(flags & DRM_MODE_FLAG_3D_MASK)) 96 mode->status = MODE_NO_STEREO; 97 } 98 99 return; 100 } 101 102 /** 103 * drm_helper_probe_single_connector_modes - get complete set of display modes 104 * @connector: connector to probe 105 * @maxX: max width for modes 106 * @maxY: max height for modes 107 * 108 * Based on the helper callbacks implemented by @connector try to detect all 109 * valid modes. Modes will first be added to the connector's probed_modes list, 110 * then culled (based on validity and the @maxX, @maxY parameters) and put into 111 * the normal modes list. 112 * 113 * Intended to be use as a generic implementation of the ->fill_modes() 114 * @connector vfunc for drivers that use the crtc helpers for output mode 115 * filtering and detection. 116 * 117 * Returns: 118 * The number of modes found on @connector. 119 */ 120 int drm_helper_probe_single_connector_modes(struct drm_connector *connector, 121 uint32_t maxX, uint32_t maxY) 122 { 123 struct drm_device *dev = connector->dev; 124 struct drm_display_mode *mode; 125 struct drm_connector_helper_funcs *connector_funcs = 126 connector->helper_private; 127 int count = 0; 128 int mode_flags = 0; 129 bool verbose_prune = true; 130 131 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 132 133 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, 134 drm_get_connector_name(connector)); 135 /* set all modes to the unverified state */ 136 list_for_each_entry(mode, &connector->modes, head) 137 mode->status = MODE_UNVERIFIED; 138 139 if (connector->force) { 140 if (connector->force == DRM_FORCE_ON) 141 connector->status = connector_status_connected; 142 else 143 connector->status = connector_status_disconnected; 144 if (connector->funcs->force) 145 connector->funcs->force(connector); 146 } else { 147 connector->status = connector->funcs->detect(connector, true); 148 } 149 150 /* Re-enable polling in case the global poll config changed. */ 151 if (drm_kms_helper_poll != dev->mode_config.poll_running) 152 drm_kms_helper_poll_enable(dev); 153 154 dev->mode_config.poll_running = drm_kms_helper_poll; 155 156 if (connector->status == connector_status_disconnected) { 157 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", 158 connector->base.id, drm_get_connector_name(connector)); 159 drm_mode_connector_update_edid_property(connector, NULL); 160 verbose_prune = false; 161 goto prune; 162 } 163 164 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE 165 count = drm_load_edid_firmware(connector); 166 if (count == 0) 167 #endif 168 count = (*connector_funcs->get_modes)(connector); 169 170 if (count == 0 && connector->status == connector_status_connected) 171 count = drm_add_modes_noedid(connector, 1024, 768); 172 if (count == 0) 173 goto prune; 174 175 drm_mode_connector_list_update(connector); 176 177 if (maxX && maxY) 178 drm_mode_validate_size(dev, &connector->modes, maxX, maxY); 179 180 if (connector->interlace_allowed) 181 mode_flags |= DRM_MODE_FLAG_INTERLACE; 182 if (connector->doublescan_allowed) 183 mode_flags |= DRM_MODE_FLAG_DBLSCAN; 184 if (connector->stereo_allowed) 185 mode_flags |= DRM_MODE_FLAG_3D_MASK; 186 drm_mode_validate_flag(connector, mode_flags); 187 188 list_for_each_entry(mode, &connector->modes, head) { 189 if (mode->status == MODE_OK) 190 mode->status = connector_funcs->mode_valid(connector, 191 mode); 192 } 193 194 prune: 195 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); 196 197 if (list_empty(&connector->modes)) 198 return 0; 199 200 list_for_each_entry(mode, &connector->modes, head) 201 mode->vrefresh = drm_mode_vrefresh(mode); 202 203 drm_mode_sort(&connector->modes); 204 205 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, 206 drm_get_connector_name(connector)); 207 list_for_each_entry(mode, &connector->modes, head) { 208 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); 209 drm_mode_debug_printmodeline(mode); 210 } 211 212 return count; 213 } 214 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); 215 216 /** 217 * drm_helper_encoder_in_use - check if a given encoder is in use 218 * @encoder: encoder to check 219 * 220 * Checks whether @encoder is with the current mode setting output configuration 221 * in use by any connector. This doesn't mean that it is actually enabled since 222 * the DPMS state is tracked separately. 223 * 224 * Returns: 225 * True if @encoder is used, false otherwise. 226 */ 227 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 228 { 229 struct drm_connector *connector; 230 struct drm_device *dev = encoder->dev; 231 232 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 233 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 234 if (connector->encoder == encoder) 235 return true; 236 return false; 237 } 238 EXPORT_SYMBOL(drm_helper_encoder_in_use); 239 240 /** 241 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 242 * @crtc: CRTC to check 243 * 244 * Checks whether @crtc is with the current mode setting output configuration 245 * in use by any connector. This doesn't mean that it is actually enabled since 246 * the DPMS state is tracked separately. 247 * 248 * Returns: 249 * True if @crtc is used, false otherwise. 250 */ 251 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 252 { 253 struct drm_encoder *encoder; 254 struct drm_device *dev = crtc->dev; 255 256 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 257 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 258 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 259 return true; 260 return false; 261 } 262 EXPORT_SYMBOL(drm_helper_crtc_in_use); 263 264 static void 265 drm_encoder_disable(struct drm_encoder *encoder) 266 { 267 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 268 269 if (encoder->bridge) 270 encoder->bridge->funcs->disable(encoder->bridge); 271 272 if (encoder_funcs->disable) 273 (*encoder_funcs->disable)(encoder); 274 else 275 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 276 277 if (encoder->bridge) 278 encoder->bridge->funcs->post_disable(encoder->bridge); 279 } 280 281 static void __drm_helper_disable_unused_functions(struct drm_device *dev) 282 { 283 struct drm_encoder *encoder; 284 struct drm_connector *connector; 285 struct drm_crtc *crtc; 286 287 drm_warn_on_modeset_not_all_locked(dev); 288 289 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 290 if (!connector->encoder) 291 continue; 292 } 293 294 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 295 if (!drm_helper_encoder_in_use(encoder)) { 296 drm_encoder_disable(encoder); 297 /* disconnector encoder from any connector */ 298 encoder->crtc = NULL; 299 } 300 } 301 302 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 303 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 304 crtc->enabled = drm_helper_crtc_in_use(crtc); 305 if (!crtc->enabled) { 306 if (crtc_funcs->disable) 307 (*crtc_funcs->disable)(crtc); 308 else 309 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 310 crtc->primary->fb = NULL; 311 } 312 } 313 } 314 315 /** 316 * drm_helper_disable_unused_functions - disable unused objects 317 * @dev: DRM device 318 * 319 * This function walks through the entire mode setting configuration of @dev. It 320 * will remove any crtc links of unused encoders and encoder links of 321 * disconnected connectors. Then it will disable all unused encoders and crtcs 322 * either by calling their disable callback if available or by calling their 323 * dpms callback with DRM_MODE_DPMS_OFF. 324 */ 325 void drm_helper_disable_unused_functions(struct drm_device *dev) 326 { 327 drm_modeset_lock_all(dev); 328 __drm_helper_disable_unused_functions(dev); 329 drm_modeset_unlock_all(dev); 330 } 331 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 332 333 /* 334 * Check the CRTC we're going to map each output to vs. its current 335 * CRTC. If they don't match, we have to disable the output and the CRTC 336 * since the driver will have to re-route things. 337 */ 338 static void 339 drm_crtc_prepare_encoders(struct drm_device *dev) 340 { 341 struct drm_encoder_helper_funcs *encoder_funcs; 342 struct drm_encoder *encoder; 343 344 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 345 encoder_funcs = encoder->helper_private; 346 /* Disable unused encoders */ 347 if (encoder->crtc == NULL) 348 drm_encoder_disable(encoder); 349 /* Disable encoders whose CRTC is about to change */ 350 if (encoder_funcs->get_crtc && 351 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 352 drm_encoder_disable(encoder); 353 } 354 } 355 356 /** 357 * drm_crtc_helper_set_mode - internal helper to set a mode 358 * @crtc: CRTC to program 359 * @mode: mode to use 360 * @x: horizontal offset into the surface 361 * @y: vertical offset into the surface 362 * @old_fb: old framebuffer, for cleanup 363 * 364 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 365 * to fixup or reject the mode prior to trying to set it. This is an internal 366 * helper that drivers could e.g. use to update properties that require the 367 * entire output pipe to be disabled and re-enabled in a new configuration. For 368 * example for changing whether audio is enabled on a hdmi link or for changing 369 * panel fitter or dither attributes. It is also called by the 370 * drm_crtc_helper_set_config() helper function to drive the mode setting 371 * sequence. 372 * 373 * Returns: 374 * True if the mode was set successfully, false otherwise. 375 */ 376 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 377 struct drm_display_mode *mode, 378 int x, int y, 379 struct drm_framebuffer *old_fb) 380 { 381 struct drm_device *dev = crtc->dev; 382 struct drm_display_mode *adjusted_mode, saved_mode; 383 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 384 struct drm_encoder_helper_funcs *encoder_funcs; 385 int saved_x, saved_y; 386 bool saved_enabled; 387 struct drm_encoder *encoder; 388 bool ret = true; 389 390 drm_warn_on_modeset_not_all_locked(dev); 391 392 saved_enabled = crtc->enabled; 393 crtc->enabled = drm_helper_crtc_in_use(crtc); 394 if (!crtc->enabled) 395 return true; 396 397 adjusted_mode = drm_mode_duplicate(dev, mode); 398 if (!adjusted_mode) { 399 crtc->enabled = saved_enabled; 400 return false; 401 } 402 403 saved_mode = crtc->mode; 404 saved_x = crtc->x; 405 saved_y = crtc->y; 406 407 /* Update crtc values up front so the driver can rely on them for mode 408 * setting. 409 */ 410 crtc->mode = *mode; 411 crtc->x = x; 412 crtc->y = y; 413 414 /* Pass our mode to the connectors and the CRTC to give them a chance to 415 * adjust it according to limitations or connector properties, and also 416 * a chance to reject the mode entirely. 417 */ 418 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 419 420 if (encoder->crtc != crtc) 421 continue; 422 423 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) { 424 ret = encoder->bridge->funcs->mode_fixup( 425 encoder->bridge, mode, adjusted_mode); 426 if (!ret) { 427 DRM_DEBUG_KMS("Bridge fixup failed\n"); 428 goto done; 429 } 430 } 431 432 encoder_funcs = encoder->helper_private; 433 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 434 adjusted_mode))) { 435 DRM_DEBUG_KMS("Encoder fixup failed\n"); 436 goto done; 437 } 438 } 439 440 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) { 441 DRM_DEBUG_KMS("CRTC fixup failed\n"); 442 goto done; 443 } 444 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id); 445 446 /* Prepare the encoders and CRTCs before setting the mode. */ 447 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 448 449 if (encoder->crtc != crtc) 450 continue; 451 452 if (encoder->bridge) 453 encoder->bridge->funcs->disable(encoder->bridge); 454 455 encoder_funcs = encoder->helper_private; 456 /* Disable the encoders as the first thing we do. */ 457 encoder_funcs->prepare(encoder); 458 459 if (encoder->bridge) 460 encoder->bridge->funcs->post_disable(encoder->bridge); 461 } 462 463 drm_crtc_prepare_encoders(dev); 464 465 crtc_funcs->prepare(crtc); 466 467 /* Set up the DPLL and any encoders state that needs to adjust or depend 468 * on the DPLL. 469 */ 470 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 471 if (!ret) 472 goto done; 473 474 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 475 476 if (encoder->crtc != crtc) 477 continue; 478 479 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 480 encoder->base.id, drm_get_encoder_name(encoder), 481 mode->base.id, mode->name); 482 encoder_funcs = encoder->helper_private; 483 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 484 485 if (encoder->bridge && encoder->bridge->funcs->mode_set) 486 encoder->bridge->funcs->mode_set(encoder->bridge, mode, 487 adjusted_mode); 488 } 489 490 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 491 crtc_funcs->commit(crtc); 492 493 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 494 495 if (encoder->crtc != crtc) 496 continue; 497 498 if (encoder->bridge) 499 encoder->bridge->funcs->pre_enable(encoder->bridge); 500 501 encoder_funcs = encoder->helper_private; 502 encoder_funcs->commit(encoder); 503 504 if (encoder->bridge) 505 encoder->bridge->funcs->enable(encoder->bridge); 506 } 507 508 /* Store real post-adjustment hardware mode. */ 509 crtc->hwmode = *adjusted_mode; 510 511 /* Calculate and store various constants which 512 * are later needed by vblank and swap-completion 513 * timestamping. They are derived from true hwmode. 514 */ 515 drm_calc_timestamping_constants(crtc, &crtc->hwmode); 516 517 /* FIXME: add subpixel order */ 518 done: 519 drm_mode_destroy(dev, adjusted_mode); 520 if (!ret) { 521 crtc->enabled = saved_enabled; 522 crtc->mode = saved_mode; 523 crtc->x = saved_x; 524 crtc->y = saved_y; 525 } 526 527 return ret; 528 } 529 EXPORT_SYMBOL(drm_crtc_helper_set_mode); 530 531 532 static int 533 drm_crtc_helper_disable(struct drm_crtc *crtc) 534 { 535 struct drm_device *dev = crtc->dev; 536 struct drm_connector *connector; 537 struct drm_encoder *encoder; 538 539 /* Decouple all encoders and their attached connectors from this crtc */ 540 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 541 if (encoder->crtc != crtc) 542 continue; 543 544 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 545 if (connector->encoder != encoder) 546 continue; 547 548 connector->encoder = NULL; 549 550 /* 551 * drm_helper_disable_unused_functions() ought to be 552 * doing this, but since we've decoupled the encoder 553 * from the connector above, the required connection 554 * between them is henceforth no longer available. 555 */ 556 connector->dpms = DRM_MODE_DPMS_OFF; 557 } 558 } 559 560 __drm_helper_disable_unused_functions(dev); 561 return 0; 562 } 563 564 /** 565 * drm_crtc_helper_set_config - set a new config from userspace 566 * @set: mode set configuration 567 * 568 * Setup a new configuration, provided by the upper layers (either an ioctl call 569 * from userspace or internally e.g. from the fbdev support code) in @set, and 570 * enable it. This is the main helper functions for drivers that implement 571 * kernel mode setting with the crtc helper functions and the assorted 572 * ->prepare(), ->modeset() and ->commit() helper callbacks. 573 * 574 * Returns: 575 * Returns 0 on success, negative errno numbers on failure. 576 */ 577 int drm_crtc_helper_set_config(struct drm_mode_set *set) 578 { 579 struct drm_device *dev; 580 struct drm_crtc *new_crtc; 581 struct drm_encoder *save_encoders, *new_encoder, *encoder; 582 bool mode_changed = false; /* if true do a full mode set */ 583 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 584 struct drm_connector *save_connectors, *connector; 585 int count = 0, ro, fail = 0; 586 struct drm_crtc_helper_funcs *crtc_funcs; 587 struct drm_mode_set save_set; 588 int ret; 589 int i; 590 591 DRM_DEBUG_KMS("\n"); 592 593 BUG_ON(!set); 594 BUG_ON(!set->crtc); 595 BUG_ON(!set->crtc->helper_private); 596 597 /* Enforce sane interface api - has been abused by the fb helper. */ 598 BUG_ON(!set->mode && set->fb); 599 BUG_ON(set->fb && set->num_connectors == 0); 600 601 crtc_funcs = set->crtc->helper_private; 602 603 if (!set->mode) 604 set->fb = NULL; 605 606 if (set->fb) { 607 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n", 608 set->crtc->base.id, set->fb->base.id, 609 (int)set->num_connectors, set->x, set->y); 610 } else { 611 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id); 612 return drm_crtc_helper_disable(set->crtc); 613 } 614 615 dev = set->crtc->dev; 616 617 drm_warn_on_modeset_not_all_locked(dev); 618 619 /* 620 * Allocate space for the backup of all (non-pointer) encoder and 621 * connector data. 622 */ 623 save_encoders = kzalloc(dev->mode_config.num_encoder * 624 sizeof(struct drm_encoder), GFP_KERNEL); 625 if (!save_encoders) 626 return -ENOMEM; 627 628 save_connectors = kzalloc(dev->mode_config.num_connector * 629 sizeof(struct drm_connector), GFP_KERNEL); 630 if (!save_connectors) { 631 kfree(save_encoders); 632 return -ENOMEM; 633 } 634 635 /* 636 * Copy data. Note that driver private data is not affected. 637 * Should anything bad happen only the expected state is 638 * restored, not the drivers personal bookkeeping. 639 */ 640 count = 0; 641 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 642 save_encoders[count++] = *encoder; 643 } 644 645 count = 0; 646 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 647 save_connectors[count++] = *connector; 648 } 649 650 save_set.crtc = set->crtc; 651 save_set.mode = &set->crtc->mode; 652 save_set.x = set->crtc->x; 653 save_set.y = set->crtc->y; 654 save_set.fb = set->crtc->primary->fb; 655 656 /* We should be able to check here if the fb has the same properties 657 * and then just flip_or_move it */ 658 if (set->crtc->primary->fb != set->fb) { 659 /* If we have no fb then treat it as a full mode set */ 660 if (set->crtc->primary->fb == NULL) { 661 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 662 mode_changed = true; 663 } else if (set->fb == NULL) { 664 mode_changed = true; 665 } else if (set->fb->pixel_format != 666 set->crtc->primary->fb->pixel_format) { 667 mode_changed = true; 668 } else 669 fb_changed = true; 670 } 671 672 if (set->x != set->crtc->x || set->y != set->crtc->y) 673 fb_changed = true; 674 675 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) { 676 DRM_DEBUG_KMS("modes are different, full mode set\n"); 677 drm_mode_debug_printmodeline(&set->crtc->mode); 678 drm_mode_debug_printmodeline(set->mode); 679 mode_changed = true; 680 } 681 682 /* a) traverse passed in connector list and get encoders for them */ 683 count = 0; 684 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 685 struct drm_connector_helper_funcs *connector_funcs = 686 connector->helper_private; 687 new_encoder = connector->encoder; 688 for (ro = 0; ro < set->num_connectors; ro++) { 689 if (set->connectors[ro] == connector) { 690 new_encoder = connector_funcs->best_encoder(connector); 691 /* if we can't get an encoder for a connector 692 we are setting now - then fail */ 693 if (new_encoder == NULL) 694 /* don't break so fail path works correct */ 695 fail = 1; 696 697 if (connector->dpms != DRM_MODE_DPMS_ON) { 698 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); 699 mode_changed = true; 700 } 701 702 break; 703 } 704 } 705 706 if (new_encoder != connector->encoder) { 707 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 708 mode_changed = true; 709 /* If the encoder is reused for another connector, then 710 * the appropriate crtc will be set later. 711 */ 712 if (connector->encoder) 713 connector->encoder->crtc = NULL; 714 connector->encoder = new_encoder; 715 } 716 } 717 718 if (fail) { 719 ret = -EINVAL; 720 goto fail; 721 } 722 723 count = 0; 724 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 725 if (!connector->encoder) 726 continue; 727 728 if (connector->encoder->crtc == set->crtc) 729 new_crtc = NULL; 730 else 731 new_crtc = connector->encoder->crtc; 732 733 for (ro = 0; ro < set->num_connectors; ro++) { 734 if (set->connectors[ro] == connector) 735 new_crtc = set->crtc; 736 } 737 738 /* Make sure the new CRTC will work with the encoder */ 739 if (new_crtc && 740 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 741 ret = -EINVAL; 742 goto fail; 743 } 744 if (new_crtc != connector->encoder->crtc) { 745 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 746 mode_changed = true; 747 connector->encoder->crtc = new_crtc; 748 } 749 if (new_crtc) { 750 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n", 751 connector->base.id, drm_get_connector_name(connector), 752 new_crtc->base.id); 753 } else { 754 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 755 connector->base.id, drm_get_connector_name(connector)); 756 } 757 } 758 759 /* mode_set_base is not a required function */ 760 if (fb_changed && !crtc_funcs->mode_set_base) 761 mode_changed = true; 762 763 if (mode_changed) { 764 if (drm_helper_crtc_in_use(set->crtc)) { 765 DRM_DEBUG_KMS("attempting to set mode from" 766 " userspace\n"); 767 drm_mode_debug_printmodeline(set->mode); 768 set->crtc->primary->fb = set->fb; 769 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 770 set->x, set->y, 771 save_set.fb)) { 772 DRM_ERROR("failed to set mode on [CRTC:%d]\n", 773 set->crtc->base.id); 774 set->crtc->primary->fb = save_set.fb; 775 ret = -EINVAL; 776 goto fail; 777 } 778 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 779 for (i = 0; i < set->num_connectors; i++) { 780 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 781 drm_get_connector_name(set->connectors[i])); 782 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 783 } 784 } 785 __drm_helper_disable_unused_functions(dev); 786 } else if (fb_changed) { 787 set->crtc->x = set->x; 788 set->crtc->y = set->y; 789 set->crtc->primary->fb = set->fb; 790 ret = crtc_funcs->mode_set_base(set->crtc, 791 set->x, set->y, save_set.fb); 792 if (ret != 0) { 793 set->crtc->x = save_set.x; 794 set->crtc->y = save_set.y; 795 set->crtc->primary->fb = save_set.fb; 796 goto fail; 797 } 798 } 799 800 kfree(save_connectors); 801 kfree(save_encoders); 802 return 0; 803 804 fail: 805 /* Restore all previous data. */ 806 count = 0; 807 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 808 *encoder = save_encoders[count++]; 809 } 810 811 count = 0; 812 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 813 *connector = save_connectors[count++]; 814 } 815 816 /* Try to restore the config */ 817 if (mode_changed && 818 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 819 save_set.y, save_set.fb)) 820 DRM_ERROR("failed to restore config after modeset failure\n"); 821 822 kfree(save_connectors); 823 kfree(save_encoders); 824 return ret; 825 } 826 EXPORT_SYMBOL(drm_crtc_helper_set_config); 827 828 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 829 { 830 int dpms = DRM_MODE_DPMS_OFF; 831 struct drm_connector *connector; 832 struct drm_device *dev = encoder->dev; 833 834 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 835 if (connector->encoder == encoder) 836 if (connector->dpms < dpms) 837 dpms = connector->dpms; 838 return dpms; 839 } 840 841 /* Helper which handles bridge ordering around encoder dpms */ 842 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) 843 { 844 struct drm_bridge *bridge = encoder->bridge; 845 struct drm_encoder_helper_funcs *encoder_funcs; 846 847 if (bridge) { 848 if (mode == DRM_MODE_DPMS_ON) 849 bridge->funcs->pre_enable(bridge); 850 else 851 bridge->funcs->disable(bridge); 852 } 853 854 encoder_funcs = encoder->helper_private; 855 if (encoder_funcs->dpms) 856 encoder_funcs->dpms(encoder, mode); 857 858 if (bridge) { 859 if (mode == DRM_MODE_DPMS_ON) 860 bridge->funcs->enable(bridge); 861 else 862 bridge->funcs->post_disable(bridge); 863 } 864 } 865 866 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 867 { 868 int dpms = DRM_MODE_DPMS_OFF; 869 struct drm_connector *connector; 870 struct drm_device *dev = crtc->dev; 871 872 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 873 if (connector->encoder && connector->encoder->crtc == crtc) 874 if (connector->dpms < dpms) 875 dpms = connector->dpms; 876 return dpms; 877 } 878 879 /** 880 * drm_helper_connector_dpms() - connector dpms helper implementation 881 * @connector: affected connector 882 * @mode: DPMS mode 883 * 884 * This is the main helper function provided by the crtc helper framework for 885 * implementing the DPMS connector attribute. It computes the new desired DPMS 886 * state for all encoders and crtcs in the output mesh and calls the ->dpms() 887 * callback provided by the driver appropriately. 888 */ 889 void drm_helper_connector_dpms(struct drm_connector *connector, int mode) 890 { 891 struct drm_encoder *encoder = connector->encoder; 892 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 893 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF; 894 895 if (mode == connector->dpms) 896 return; 897 898 old_dpms = connector->dpms; 899 connector->dpms = mode; 900 901 if (encoder) 902 encoder_dpms = drm_helper_choose_encoder_dpms(encoder); 903 904 /* from off to on, do crtc then encoder */ 905 if (mode < old_dpms) { 906 if (crtc) { 907 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 908 if (crtc_funcs->dpms) 909 (*crtc_funcs->dpms) (crtc, 910 drm_helper_choose_crtc_dpms(crtc)); 911 } 912 if (encoder) 913 drm_helper_encoder_dpms(encoder, encoder_dpms); 914 } 915 916 /* from on to off, do encoder then crtc */ 917 if (mode > old_dpms) { 918 if (encoder) 919 drm_helper_encoder_dpms(encoder, encoder_dpms); 920 if (crtc) { 921 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 922 if (crtc_funcs->dpms) 923 (*crtc_funcs->dpms) (crtc, 924 drm_helper_choose_crtc_dpms(crtc)); 925 } 926 } 927 928 return; 929 } 930 EXPORT_SYMBOL(drm_helper_connector_dpms); 931 932 /** 933 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata 934 * @fb: drm_framebuffer object to fill out 935 * @mode_cmd: metadata from the userspace fb creation request 936 * 937 * This helper can be used in a drivers fb_create callback to pre-fill the fb's 938 * metadata fields. 939 */ 940 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 941 struct drm_mode_fb_cmd2 *mode_cmd) 942 { 943 int i; 944 945 fb->width = mode_cmd->width; 946 fb->height = mode_cmd->height; 947 for (i = 0; i < 4; i++) { 948 fb->pitches[i] = mode_cmd->pitches[i]; 949 fb->offsets[i] = mode_cmd->offsets[i]; 950 } 951 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, 952 &fb->bits_per_pixel); 953 fb->pixel_format = mode_cmd->pixel_format; 954 } 955 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 956 957 /** 958 * drm_helper_resume_force_mode - force-restore mode setting configuration 959 * @dev: drm_device which should be restored 960 * 961 * Drivers which use the mode setting helpers can use this function to 962 * force-restore the mode setting configuration e.g. on resume or when something 963 * else might have trampled over the hw state (like some overzealous old BIOSen 964 * tended to do). 965 * 966 * This helper doesn't provide a error return value since restoring the old 967 * config should never fail due to resource allocation issues since the driver 968 * has successfully set the restored configuration already. Hence this should 969 * boil down to the equivalent of a few dpms on calls, which also don't provide 970 * an error code. 971 * 972 * Drivers where simply restoring an old configuration again might fail (e.g. 973 * due to slight differences in allocating shared resources when the 974 * configuration is restored in a different order than when userspace set it up) 975 * need to use their own restore logic. 976 */ 977 void drm_helper_resume_force_mode(struct drm_device *dev) 978 { 979 struct drm_crtc *crtc; 980 struct drm_encoder *encoder; 981 struct drm_crtc_helper_funcs *crtc_funcs; 982 int encoder_dpms; 983 bool ret; 984 985 drm_modeset_lock_all(dev); 986 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 987 988 if (!crtc->enabled) 989 continue; 990 991 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 992 crtc->x, crtc->y, crtc->primary->fb); 993 994 /* Restoring the old config should never fail! */ 995 if (ret == false) 996 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 997 998 /* Turn off outputs that were already powered off */ 999 if (drm_helper_choose_crtc_dpms(crtc)) { 1000 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 1001 1002 if(encoder->crtc != crtc) 1003 continue; 1004 1005 encoder_dpms = drm_helper_choose_encoder_dpms( 1006 encoder); 1007 1008 drm_helper_encoder_dpms(encoder, encoder_dpms); 1009 } 1010 1011 crtc_funcs = crtc->helper_private; 1012 if (crtc_funcs->dpms) 1013 (*crtc_funcs->dpms) (crtc, 1014 drm_helper_choose_crtc_dpms(crtc)); 1015 } 1016 } 1017 1018 /* disable the unused connectors while restoring the modesetting */ 1019 __drm_helper_disable_unused_functions(dev); 1020 drm_modeset_unlock_all(dev); 1021 } 1022 EXPORT_SYMBOL(drm_helper_resume_force_mode); 1023 1024 /** 1025 * drm_kms_helper_hotplug_event - fire off KMS hotplug events 1026 * @dev: drm_device whose connector state changed 1027 * 1028 * This function fires off the uevent for userspace and also calls the 1029 * output_poll_changed function, which is most commonly used to inform the fbdev 1030 * emulation code and allow it to update the fbcon output configuration. 1031 * 1032 * Drivers should call this from their hotplug handling code when a change is 1033 * detected. Note that this function does not do any output detection of its 1034 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the 1035 * driver already. 1036 * 1037 * This function must be called from process context with no mode 1038 * setting locks held. 1039 */ 1040 void drm_kms_helper_hotplug_event(struct drm_device *dev) 1041 { 1042 /* send a uevent + call fbdev */ 1043 drm_sysfs_hotplug_event(dev); 1044 if (dev->mode_config.funcs->output_poll_changed) 1045 dev->mode_config.funcs->output_poll_changed(dev); 1046 } 1047 EXPORT_SYMBOL(drm_kms_helper_hotplug_event); 1048 1049 #define DRM_OUTPUT_POLL_PERIOD (10*HZ) 1050 static void output_poll_execute(struct work_struct *work) 1051 { 1052 struct delayed_work *delayed_work = to_delayed_work(work); 1053 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); 1054 struct drm_connector *connector; 1055 enum drm_connector_status old_status; 1056 bool repoll = false, changed = false; 1057 1058 if (!drm_kms_helper_poll) 1059 return; 1060 1061 mutex_lock(&dev->mode_config.mutex); 1062 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 1063 1064 /* Ignore forced connectors. */ 1065 if (connector->force) 1066 continue; 1067 1068 /* Ignore HPD capable connectors and connectors where we don't 1069 * want any hotplug detection at all for polling. */ 1070 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) 1071 continue; 1072 1073 repoll = true; 1074 1075 old_status = connector->status; 1076 /* if we are connected and don't want to poll for disconnect 1077 skip it */ 1078 if (old_status == connector_status_connected && 1079 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) 1080 continue; 1081 1082 connector->status = connector->funcs->detect(connector, false); 1083 if (old_status != connector->status) { 1084 const char *old, *new; 1085 1086 old = drm_get_connector_status_name(old_status); 1087 new = drm_get_connector_status_name(connector->status); 1088 1089 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " 1090 "status updated from %s to %s\n", 1091 connector->base.id, 1092 drm_get_connector_name(connector), 1093 old, new); 1094 1095 changed = true; 1096 } 1097 } 1098 1099 mutex_unlock(&dev->mode_config.mutex); 1100 1101 if (changed) 1102 drm_kms_helper_hotplug_event(dev); 1103 1104 if (repoll) 1105 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); 1106 } 1107 1108 /** 1109 * drm_kms_helper_poll_disable - disable output polling 1110 * @dev: drm_device 1111 * 1112 * This function disables the output polling work. 1113 * 1114 * Drivers can call this helper from their device suspend implementation. It is 1115 * not an error to call this even when output polling isn't enabled or arlready 1116 * disabled. 1117 */ 1118 void drm_kms_helper_poll_disable(struct drm_device *dev) 1119 { 1120 if (!dev->mode_config.poll_enabled) 1121 return; 1122 cancel_delayed_work_sync(&dev->mode_config.output_poll_work); 1123 } 1124 EXPORT_SYMBOL(drm_kms_helper_poll_disable); 1125 1126 /** 1127 * drm_kms_helper_poll_enable - re-enable output polling. 1128 * @dev: drm_device 1129 * 1130 * This function re-enables the output polling work. 1131 * 1132 * Drivers can call this helper from their device resume implementation. It is 1133 * an error to call this when the output polling support has not yet been set 1134 * up. 1135 */ 1136 void drm_kms_helper_poll_enable(struct drm_device *dev) 1137 { 1138 bool poll = false; 1139 struct drm_connector *connector; 1140 1141 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) 1142 return; 1143 1144 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 1145 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | 1146 DRM_CONNECTOR_POLL_DISCONNECT)) 1147 poll = true; 1148 } 1149 1150 if (poll) 1151 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); 1152 } 1153 EXPORT_SYMBOL(drm_kms_helper_poll_enable); 1154 1155 /** 1156 * drm_kms_helper_poll_init - initialize and enable output polling 1157 * @dev: drm_device 1158 * 1159 * This function intializes and then also enables output polling support for 1160 * @dev. Drivers which do not have reliable hotplug support in hardware can use 1161 * this helper infrastructure to regularly poll such connectors for changes in 1162 * their connection state. 1163 * 1164 * Drivers can control which connectors are polled by setting the 1165 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On 1166 * connectors where probing live outputs can result in visual distortion drivers 1167 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. 1168 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are 1169 * completely ignored by the polling logic. 1170 * 1171 * Note that a connector can be both polled and probed from the hotplug handler, 1172 * in case the hotplug interrupt is known to be unreliable. 1173 */ 1174 void drm_kms_helper_poll_init(struct drm_device *dev) 1175 { 1176 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); 1177 dev->mode_config.poll_enabled = true; 1178 1179 drm_kms_helper_poll_enable(dev); 1180 } 1181 EXPORT_SYMBOL(drm_kms_helper_poll_init); 1182 1183 /** 1184 * drm_kms_helper_poll_fini - disable output polling and clean it up 1185 * @dev: drm_device 1186 */ 1187 void drm_kms_helper_poll_fini(struct drm_device *dev) 1188 { 1189 drm_kms_helper_poll_disable(dev); 1190 } 1191 EXPORT_SYMBOL(drm_kms_helper_poll_fini); 1192 1193 /** 1194 * drm_helper_hpd_irq_event - hotplug processing 1195 * @dev: drm_device 1196 * 1197 * Drivers can use this helper function to run a detect cycle on all connectors 1198 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All 1199 * other connectors are ignored, which is useful to avoid reprobing fixed 1200 * panels. 1201 * 1202 * This helper function is useful for drivers which can't or don't track hotplug 1203 * interrupts for each connector. 1204 * 1205 * Drivers which support hotplug interrupts for each connector individually and 1206 * which have a more fine-grained detect logic should bypass this code and 1207 * directly call drm_kms_helper_hotplug_event() in case the connector state 1208 * changed. 1209 * 1210 * This function must be called from process context with no mode 1211 * setting locks held. 1212 * 1213 * Note that a connector can be both polled and probed from the hotplug handler, 1214 * in case the hotplug interrupt is known to be unreliable. 1215 */ 1216 bool drm_helper_hpd_irq_event(struct drm_device *dev) 1217 { 1218 struct drm_connector *connector; 1219 enum drm_connector_status old_status; 1220 bool changed = false; 1221 1222 if (!dev->mode_config.poll_enabled) 1223 return false; 1224 1225 mutex_lock(&dev->mode_config.mutex); 1226 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 1227 1228 /* Only handle HPD capable connectors. */ 1229 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) 1230 continue; 1231 1232 old_status = connector->status; 1233 1234 connector->status = connector->funcs->detect(connector, false); 1235 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", 1236 connector->base.id, 1237 drm_get_connector_name(connector), 1238 drm_get_connector_status_name(old_status), 1239 drm_get_connector_status_name(connector->status)); 1240 if (old_status != connector->status) 1241 changed = true; 1242 } 1243 1244 mutex_unlock(&dev->mode_config.mutex); 1245 1246 if (changed) 1247 drm_kms_helper_hotplug_event(dev); 1248 1249 return changed; 1250 } 1251 EXPORT_SYMBOL(drm_helper_hpd_irq_event); 1252