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 <uapi_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 bool 43 drm_fetch_cmdline_mode_from_kenv(struct drm_connector *connector, 44 struct drm_cmdline_mode *cmdline_mode) 45 { 46 char *tun_var_name, *tun_mode; 47 static const char tun_prefix[] = "drm_mode."; 48 bool res; 49 50 res = false; 51 tun_var_name = kmalloc(sizeof(tun_prefix) + 52 strlen(drm_get_connector_name(connector)), M_TEMP, M_WAITOK); 53 strcpy(tun_var_name, tun_prefix); 54 strcat(tun_var_name, drm_get_connector_name(connector)); 55 tun_mode = kgetenv(tun_var_name); 56 if (tun_mode != NULL) { 57 res = drm_mode_parse_command_line_for_connector(tun_mode, 58 connector, cmdline_mode); 59 kfreeenv(tun_mode); 60 } 61 drm_free(tun_var_name, M_TEMP); 62 return (res); 63 } 64 65 /** 66 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the 67 * connector list 68 * @dev: drm device to operate on 69 * 70 * Some userspace presumes that the first connected connector is the main 71 * display, where it's supposed to display e.g. the login screen. For 72 * laptops, this should be the main panel. Use this function to sort all 73 * (eDP/LVDS) panels to the front of the connector list, instead of 74 * painstakingly trying to initialize them in the right order. 75 */ 76 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) 77 { 78 struct drm_connector *connector, *tmp; 79 struct list_head panel_list; 80 81 INIT_LIST_HEAD(&panel_list); 82 83 list_for_each_entry_safe(connector, tmp, 84 &dev->mode_config.connector_list, head) { 85 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS || 86 connector->connector_type == DRM_MODE_CONNECTOR_eDP) 87 list_move_tail(&connector->head, &panel_list); 88 } 89 90 list_splice(&panel_list, &dev->mode_config.connector_list); 91 } 92 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 93 94 static bool drm_kms_helper_poll = true; 95 96 static void drm_mode_validate_flag(struct drm_connector *connector, 97 int flags) 98 { 99 struct drm_display_mode *mode; 100 101 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE)) 102 return; 103 104 list_for_each_entry(mode, &connector->modes, head) { 105 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && 106 !(flags & DRM_MODE_FLAG_INTERLACE)) 107 mode->status = MODE_NO_INTERLACE; 108 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && 109 !(flags & DRM_MODE_FLAG_DBLSCAN)) 110 mode->status = MODE_NO_DBLESCAN; 111 } 112 113 return; 114 } 115 116 /** 117 * drm_helper_probe_single_connector_modes - get complete set of display modes 118 * @connector: connector to probe 119 * @maxX: max width for modes 120 * @maxY: max height for modes 121 * 122 * LOCKING: 123 * Caller must hold mode config lock. 124 * 125 * Based on the helper callbacks implemented by @connector try to detect all 126 * valid modes. Modes will first be added to the connector's probed_modes list, 127 * then culled (based on validity and the @maxX, @maxY parameters) and put into 128 * the normal modes list. 129 * 130 * Intended to be use as a generic implementation of the ->probe() @connector 131 * callback for drivers that use the crtc helpers for output mode filtering and 132 * detection. 133 * 134 * RETURNS: 135 * Number of modes found on @connector. 136 */ 137 int drm_helper_probe_single_connector_modes(struct drm_connector *connector, 138 uint32_t maxX, uint32_t maxY) 139 { 140 struct drm_device *dev = connector->dev; 141 struct drm_display_mode *mode; 142 struct drm_connector_helper_funcs *connector_funcs = 143 connector->helper_private; 144 int count = 0; 145 int mode_flags = 0; 146 bool verbose_prune = true; 147 148 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, 149 drm_get_connector_name(connector)); 150 /* set all modes to the unverified state */ 151 list_for_each_entry(mode, &connector->modes, head) 152 mode->status = MODE_UNVERIFIED; 153 154 if (connector->force) { 155 if (connector->force == DRM_FORCE_ON) 156 connector->status = connector_status_connected; 157 else 158 connector->status = connector_status_disconnected; 159 if (connector->funcs->force) 160 connector->funcs->force(connector); 161 } else { 162 connector->status = connector->funcs->detect(connector, true); 163 } 164 165 /* Re-enable polling in case the global poll config changed. */ 166 if (drm_kms_helper_poll != dev->mode_config.poll_running) 167 drm_kms_helper_poll_enable(dev); 168 169 dev->mode_config.poll_running = drm_kms_helper_poll; 170 171 if (connector->status == connector_status_disconnected) { 172 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", 173 connector->base.id, drm_get_connector_name(connector)); 174 drm_mode_connector_update_edid_property(connector, NULL); 175 verbose_prune = false; 176 goto prune; 177 } 178 179 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE 180 count = drm_load_edid_firmware(connector); 181 if (count == 0) 182 #endif 183 count = (*connector_funcs->get_modes)(connector); 184 185 if (count == 0 && connector->status == connector_status_connected) 186 count = drm_add_modes_noedid(connector, 1024, 768); 187 if (count == 0) 188 goto prune; 189 190 drm_mode_connector_list_update(connector); 191 192 if (maxX && maxY) 193 drm_mode_validate_size(dev, &connector->modes, maxX, 194 maxY, 0); 195 196 if (connector->interlace_allowed) 197 mode_flags |= DRM_MODE_FLAG_INTERLACE; 198 if (connector->doublescan_allowed) 199 mode_flags |= DRM_MODE_FLAG_DBLSCAN; 200 drm_mode_validate_flag(connector, mode_flags); 201 202 list_for_each_entry(mode, &connector->modes, head) { 203 if (mode->status == MODE_OK) 204 mode->status = connector_funcs->mode_valid(connector, 205 mode); 206 } 207 208 prune: 209 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); 210 211 if (list_empty(&connector->modes)) 212 return 0; 213 214 drm_mode_sort(&connector->modes); 215 216 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, 217 drm_get_connector_name(connector)); 218 list_for_each_entry(mode, &connector->modes, head) { 219 mode->vrefresh = drm_mode_vrefresh(mode); 220 221 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); 222 drm_mode_debug_printmodeline(mode); 223 } 224 225 return count; 226 } 227 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); 228 229 /** 230 * drm_helper_encoder_in_use - check if a given encoder is in use 231 * @encoder: encoder to check 232 * 233 * LOCKING: 234 * Caller must hold mode config lock. 235 * 236 * Walk @encoders's DRM device's mode_config and see if it's in use. 237 * 238 * RETURNS: 239 * True if @encoder is part of the mode_config, false otherwise. 240 */ 241 bool drm_helper_encoder_in_use(struct drm_encoder *encoder) 242 { 243 struct drm_connector *connector; 244 struct drm_device *dev = encoder->dev; 245 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 246 if (connector->encoder == encoder) 247 return true; 248 return false; 249 } 250 EXPORT_SYMBOL(drm_helper_encoder_in_use); 251 252 /** 253 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config 254 * @crtc: CRTC to check 255 * 256 * LOCKING: 257 * Caller must hold mode config lock. 258 * 259 * Walk @crtc's DRM device's mode_config and see if it's in use. 260 * 261 * RETURNS: 262 * True if @crtc is part of the mode_config, false otherwise. 263 */ 264 bool drm_helper_crtc_in_use(struct drm_crtc *crtc) 265 { 266 struct drm_encoder *encoder; 267 struct drm_device *dev = crtc->dev; 268 /* FIXME: Locking around list access? */ 269 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) 270 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) 271 return true; 272 return false; 273 } 274 EXPORT_SYMBOL(drm_helper_crtc_in_use); 275 276 static void 277 drm_encoder_disable(struct drm_encoder *encoder) 278 { 279 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 280 281 if (encoder_funcs->disable) 282 (*encoder_funcs->disable)(encoder); 283 else 284 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); 285 } 286 287 /** 288 * drm_helper_disable_unused_functions - disable unused objects 289 * @dev: DRM device 290 * 291 * LOCKING: 292 * Caller must hold mode config lock. 293 * 294 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled 295 * by calling its dpms function, which should power it off. 296 */ 297 void drm_helper_disable_unused_functions(struct drm_device *dev) 298 { 299 struct drm_encoder *encoder; 300 struct drm_connector *connector; 301 struct drm_crtc *crtc; 302 303 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 304 if (!connector->encoder) 305 continue; 306 if (connector->status == connector_status_disconnected) 307 connector->encoder = NULL; 308 } 309 310 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 311 if (!drm_helper_encoder_in_use(encoder)) { 312 drm_encoder_disable(encoder); 313 /* disconnector encoder from any connector */ 314 encoder->crtc = NULL; 315 } 316 } 317 318 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 319 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 320 crtc->enabled = drm_helper_crtc_in_use(crtc); 321 if (!crtc->enabled) { 322 if (crtc_funcs->disable) 323 (*crtc_funcs->disable)(crtc); 324 else 325 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); 326 crtc->fb = NULL; 327 } 328 } 329 } 330 EXPORT_SYMBOL(drm_helper_disable_unused_functions); 331 332 /** 333 * drm_encoder_crtc_ok - can a given crtc drive a given encoder? 334 * @encoder: encoder to test 335 * @crtc: crtc to test 336 * 337 * Return false if @encoder can't be driven by @crtc, true otherwise. 338 */ 339 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder, 340 struct drm_crtc *crtc) 341 { 342 struct drm_device *dev; 343 struct drm_crtc *tmp; 344 int crtc_mask = 1; 345 346 WARN(!crtc, "checking null crtc?\n"); 347 348 dev = crtc->dev; 349 350 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) { 351 if (tmp == crtc) 352 break; 353 crtc_mask <<= 1; 354 } 355 356 if (encoder->possible_crtcs & crtc_mask) 357 return true; 358 return false; 359 } 360 361 /* 362 * Check the CRTC we're going to map each output to vs. its current 363 * CRTC. If they don't match, we have to disable the output and the CRTC 364 * since the driver will have to re-route things. 365 */ 366 static void 367 drm_crtc_prepare_encoders(struct drm_device *dev) 368 { 369 struct drm_encoder_helper_funcs *encoder_funcs; 370 struct drm_encoder *encoder; 371 372 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 373 encoder_funcs = encoder->helper_private; 374 /* Disable unused encoders */ 375 if (encoder->crtc == NULL) 376 drm_encoder_disable(encoder); 377 /* Disable encoders whose CRTC is about to change */ 378 if (encoder_funcs->get_crtc && 379 encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) 380 drm_encoder_disable(encoder); 381 } 382 } 383 384 /** 385 * drm_crtc_helper_set_mode - internal helper to set a mode 386 * @crtc: CRTC to program 387 * @mode: mode to use 388 * @x: horizontal offset into the surface 389 * @y: vertical offset into the surface 390 * @old_fb: old framebuffer, for cleanup 391 * 392 * LOCKING: 393 * Caller must hold mode config lock. 394 * 395 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance 396 * to fixup or reject the mode prior to trying to set it. This is an internal 397 * helper that drivers could e.g. use to update properties that require the 398 * entire output pipe to be disabled and re-enabled in a new configuration. For 399 * example for changing whether audio is enabled on a hdmi link or for changing 400 * panel fitter or dither attributes. It is also called by the 401 * drm_crtc_helper_set_config() helper function to drive the mode setting 402 * sequence. 403 * 404 * RETURNS: 405 * True if the mode was set successfully, or false otherwise. 406 */ 407 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 408 struct drm_display_mode *mode, 409 int x, int y, 410 struct drm_framebuffer *old_fb) 411 { 412 struct drm_device *dev = crtc->dev; 413 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; 414 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 415 struct drm_encoder_helper_funcs *encoder_funcs; 416 int saved_x, saved_y; 417 struct drm_encoder *encoder; 418 bool ret = true; 419 420 crtc->enabled = drm_helper_crtc_in_use(crtc); 421 if (!crtc->enabled) 422 return true; 423 424 adjusted_mode = drm_mode_duplicate(dev, mode); 425 if (!adjusted_mode) 426 return false; 427 428 saved_hwmode = crtc->hwmode; 429 saved_mode = crtc->mode; 430 saved_x = crtc->x; 431 saved_y = crtc->y; 432 433 /* Update crtc values up front so the driver can rely on them for mode 434 * setting. 435 */ 436 crtc->mode = *mode; 437 crtc->x = x; 438 crtc->y = y; 439 440 /* Pass our mode to the connectors and the CRTC to give them a chance to 441 * adjust it according to limitations or connector properties, and also 442 * a chance to reject the mode entirely. 443 */ 444 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 445 446 if (encoder->crtc != crtc) 447 continue; 448 encoder_funcs = encoder->helper_private; 449 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, 450 adjusted_mode))) { 451 DRM_DEBUG_KMS("Encoder fixup failed\n"); 452 goto done; 453 } 454 } 455 456 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) { 457 DRM_DEBUG_KMS("CRTC fixup failed\n"); 458 goto done; 459 } 460 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id); 461 462 /* Prepare the encoders and CRTCs before setting the mode. */ 463 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 464 465 if (encoder->crtc != crtc) 466 continue; 467 encoder_funcs = encoder->helper_private; 468 /* Disable the encoders as the first thing we do. */ 469 encoder_funcs->prepare(encoder); 470 } 471 472 drm_crtc_prepare_encoders(dev); 473 474 crtc_funcs->prepare(crtc); 475 476 /* Set up the DPLL and any encoders state that needs to adjust or depend 477 * on the DPLL. 478 */ 479 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); 480 if (!ret) 481 goto done; 482 483 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 484 485 if (encoder->crtc != crtc) 486 continue; 487 488 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", 489 encoder->base.id, drm_get_encoder_name(encoder), 490 mode->base.id, mode->name); 491 encoder_funcs = encoder->helper_private; 492 encoder_funcs->mode_set(encoder, mode, adjusted_mode); 493 } 494 495 /* Now enable the clocks, plane, pipe, and connectors that we set up. */ 496 crtc_funcs->commit(crtc); 497 498 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 499 500 if (encoder->crtc != crtc) 501 continue; 502 503 encoder_funcs = encoder->helper_private; 504 encoder_funcs->commit(encoder); 505 506 } 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); 516 517 /* FIXME: add subpixel order */ 518 done: 519 drm_mode_destroy(dev, adjusted_mode); 520 if (!ret) { 521 crtc->hwmode = saved_hwmode; 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 } 551 552 drm_helper_disable_unused_functions(dev); 553 return 0; 554 } 555 556 /** 557 * drm_crtc_helper_set_config - set a new config from userspace 558 * @set: mode set configuration 559 * 560 * LOCKING: 561 * Caller must hold mode config lock. 562 * 563 * Setup a new configuration, provided by the upper layers (either an ioctl call 564 * from userspace or internally e.g. from the fbdev suppport code) in @set, and 565 * enable it. This is the main helper functions for drivers that implement 566 * kernel mode setting with the crtc helper functions and the assorted 567 * ->prepare(), ->modeset() and ->commit() helper callbacks. 568 * 569 * RETURNS: 570 * Returns 0 on success, -ERRNO on failure. 571 */ 572 int drm_crtc_helper_set_config(struct drm_mode_set *set) 573 { 574 struct drm_device *dev; 575 struct drm_crtc *save_crtcs, *new_crtc, *crtc; 576 struct drm_encoder *save_encoders, *new_encoder, *encoder; 577 struct drm_framebuffer *old_fb = NULL; 578 bool mode_changed = false; /* if true do a full mode set */ 579 bool fb_changed = false; /* if true and !mode_changed just do a flip */ 580 struct drm_connector *save_connectors, *connector; 581 int count = 0, ro, fail = 0; 582 struct drm_crtc_helper_funcs *crtc_funcs; 583 struct drm_mode_set save_set; 584 int ret; 585 int i; 586 587 DRM_DEBUG_KMS("\n"); 588 589 if (!set) 590 return -EINVAL; 591 592 if (!set->crtc) 593 return -EINVAL; 594 595 if (!set->crtc->helper_private) 596 return -EINVAL; 597 598 crtc_funcs = set->crtc->helper_private; 599 600 if (!set->mode) 601 set->fb = NULL; 602 603 if (set->fb) { 604 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n", 605 set->crtc->base.id, set->fb->base.id, 606 (int)set->num_connectors, set->x, set->y); 607 } else { 608 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id); 609 return drm_crtc_helper_disable(set->crtc); 610 } 611 612 dev = set->crtc->dev; 613 614 /* Allocate space for the backup of all (non-pointer) crtc, encoder and 615 * connector data. */ 616 save_crtcs = kzalloc(dev->mode_config.num_crtc * 617 sizeof(struct drm_crtc), GFP_KERNEL); 618 if (!save_crtcs) 619 return -ENOMEM; 620 621 save_encoders = kzalloc(dev->mode_config.num_encoder * 622 sizeof(struct drm_encoder), GFP_KERNEL); 623 if (!save_encoders) { 624 kfree(save_crtcs); 625 return -ENOMEM; 626 } 627 628 save_connectors = kzalloc(dev->mode_config.num_connector * 629 sizeof(struct drm_connector), GFP_KERNEL); 630 if (!save_connectors) { 631 kfree(save_crtcs); 632 kfree(save_encoders); 633 return -ENOMEM; 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(crtc, &dev->mode_config.crtc_list, head) { 642 save_crtcs[count++] = *crtc; 643 } 644 645 count = 0; 646 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 647 save_encoders[count++] = *encoder; 648 } 649 650 count = 0; 651 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 652 save_connectors[count++] = *connector; 653 } 654 655 save_set.crtc = set->crtc; 656 save_set.mode = &set->crtc->mode; 657 save_set.x = set->crtc->x; 658 save_set.y = set->crtc->y; 659 save_set.fb = set->crtc->fb; 660 661 /* We should be able to check here if the fb has the same properties 662 * and then just flip_or_move it */ 663 if (set->crtc->fb != set->fb) { 664 /* If we have no fb then treat it as a full mode set */ 665 if (set->crtc->fb == NULL) { 666 DRM_DEBUG_KMS("crtc has no fb, full mode set\n"); 667 mode_changed = true; 668 } else if (set->fb == NULL) { 669 mode_changed = true; 670 } else if (set->fb->depth != set->crtc->fb->depth) { 671 mode_changed = true; 672 } else if (set->fb->bits_per_pixel != 673 set->crtc->fb->bits_per_pixel) { 674 mode_changed = true; 675 } else if (set->fb->pixel_format != 676 set->crtc->fb->pixel_format) { 677 mode_changed = true; 678 } else 679 fb_changed = true; 680 } 681 682 if (set->x != set->crtc->x || set->y != set->crtc->y) 683 fb_changed = true; 684 685 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) { 686 DRM_DEBUG_KMS("modes are different, full mode set\n"); 687 drm_mode_debug_printmodeline(&set->crtc->mode); 688 drm_mode_debug_printmodeline(set->mode); 689 mode_changed = true; 690 } 691 692 /* a) traverse passed in connector list and get encoders for them */ 693 count = 0; 694 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 695 struct drm_connector_helper_funcs *connector_funcs = 696 connector->helper_private; 697 new_encoder = connector->encoder; 698 for (ro = 0; ro < set->num_connectors; ro++) { 699 if (set->connectors[ro] == connector) { 700 new_encoder = connector_funcs->best_encoder(connector); 701 /* if we can't get an encoder for a connector 702 we are setting now - then fail */ 703 if (new_encoder == NULL) 704 /* don't break so fail path works correct */ 705 fail = 1; 706 break; 707 } 708 } 709 710 if (new_encoder != connector->encoder) { 711 DRM_DEBUG_KMS("encoder changed, full mode switch\n"); 712 mode_changed = true; 713 /* If the encoder is reused for another connector, then 714 * the appropriate crtc will be set later. 715 */ 716 if (connector->encoder) 717 connector->encoder->crtc = NULL; 718 connector->encoder = new_encoder; 719 } 720 } 721 722 if (fail) { 723 ret = -EINVAL; 724 goto fail; 725 } 726 727 count = 0; 728 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 729 if (!connector->encoder) 730 continue; 731 732 if (connector->encoder->crtc == set->crtc) 733 new_crtc = NULL; 734 else 735 new_crtc = connector->encoder->crtc; 736 737 for (ro = 0; ro < set->num_connectors; ro++) { 738 if (set->connectors[ro] == connector) 739 new_crtc = set->crtc; 740 } 741 742 /* Make sure the new CRTC will work with the encoder */ 743 if (new_crtc && 744 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) { 745 ret = -EINVAL; 746 goto fail; 747 } 748 if (new_crtc != connector->encoder->crtc) { 749 DRM_DEBUG_KMS("crtc changed, full mode switch\n"); 750 mode_changed = true; 751 connector->encoder->crtc = new_crtc; 752 } 753 if (new_crtc) { 754 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n", 755 connector->base.id, drm_get_connector_name(connector), 756 new_crtc->base.id); 757 } else { 758 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", 759 connector->base.id, drm_get_connector_name(connector)); 760 } 761 } 762 763 /* mode_set_base is not a required function */ 764 if (fb_changed && !crtc_funcs->mode_set_base) 765 mode_changed = true; 766 767 if (mode_changed) { 768 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc); 769 if (set->crtc->enabled) { 770 DRM_DEBUG_KMS("attempting to set mode from" 771 " userspace\n"); 772 drm_mode_debug_printmodeline(set->mode); 773 old_fb = set->crtc->fb; 774 set->crtc->fb = set->fb; 775 if (!drm_crtc_helper_set_mode(set->crtc, set->mode, 776 set->x, set->y, 777 old_fb)) { 778 DRM_ERROR("failed to set mode on [CRTC:%d]\n", 779 set->crtc->base.id); 780 set->crtc->fb = old_fb; 781 ret = -EINVAL; 782 goto fail; 783 } 784 DRM_DEBUG_KMS("Setting connector DPMS state to on\n"); 785 for (i = 0; i < set->num_connectors; i++) { 786 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id, 787 drm_get_connector_name(set->connectors[i])); 788 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON); 789 } 790 } 791 drm_helper_disable_unused_functions(dev); 792 } else if (fb_changed) { 793 set->crtc->x = set->x; 794 set->crtc->y = set->y; 795 796 old_fb = set->crtc->fb; 797 if (set->crtc->fb != set->fb) 798 set->crtc->fb = set->fb; 799 ret = crtc_funcs->mode_set_base(set->crtc, 800 set->x, set->y, old_fb); 801 if (ret != 0) { 802 set->crtc->fb = old_fb; 803 goto fail; 804 } 805 } 806 807 kfree(save_connectors); 808 kfree(save_encoders); 809 kfree(save_crtcs); 810 return 0; 811 812 fail: 813 /* Restore all previous data. */ 814 count = 0; 815 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 816 *crtc = save_crtcs[count++]; 817 } 818 819 count = 0; 820 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 821 *encoder = save_encoders[count++]; 822 } 823 824 count = 0; 825 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 826 *connector = save_connectors[count++]; 827 } 828 829 /* Try to restore the config */ 830 if (mode_changed && 831 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x, 832 save_set.y, save_set.fb)) 833 DRM_ERROR("failed to restore config after modeset failure\n"); 834 835 kfree(save_connectors); 836 kfree(save_encoders); 837 kfree(save_crtcs); 838 return ret; 839 } 840 EXPORT_SYMBOL(drm_crtc_helper_set_config); 841 842 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder) 843 { 844 int dpms = DRM_MODE_DPMS_OFF; 845 struct drm_connector *connector; 846 struct drm_device *dev = encoder->dev; 847 848 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 849 if (connector->encoder == encoder) 850 if (connector->dpms < dpms) 851 dpms = connector->dpms; 852 return dpms; 853 } 854 855 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) 856 { 857 int dpms = DRM_MODE_DPMS_OFF; 858 struct drm_connector *connector; 859 struct drm_device *dev = crtc->dev; 860 861 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 862 if (connector->encoder && connector->encoder->crtc == crtc) 863 if (connector->dpms < dpms) 864 dpms = connector->dpms; 865 return dpms; 866 } 867 868 /** 869 * drm_helper_connector_dpms() - connector dpms helper implementation 870 * @connector: affected connector 871 * @mode: DPMS mode 872 * 873 * This is the main helper function provided by the crtc helper framework for 874 * implementing the DPMS connector attribute. It computes the new desired DPMS 875 * state for all encoders and crtcs in the output mesh and calls the ->dpms() 876 * callback provided by the driver appropriately. 877 */ 878 void drm_helper_connector_dpms(struct drm_connector *connector, int mode) 879 { 880 struct drm_encoder *encoder = connector->encoder; 881 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; 882 int old_dpms; 883 884 if (mode == connector->dpms) 885 return; 886 887 old_dpms = connector->dpms; 888 connector->dpms = mode; 889 890 /* from off to on, do crtc then encoder */ 891 if (mode < old_dpms) { 892 if (crtc) { 893 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 894 if (crtc_funcs->dpms) 895 (*crtc_funcs->dpms) (crtc, 896 drm_helper_choose_crtc_dpms(crtc)); 897 } 898 if (encoder) { 899 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 900 if (encoder_funcs->dpms) 901 (*encoder_funcs->dpms) (encoder, 902 drm_helper_choose_encoder_dpms(encoder)); 903 } 904 } 905 906 /* from on to off, do encoder then crtc */ 907 if (mode > old_dpms) { 908 if (encoder) { 909 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; 910 if (encoder_funcs->dpms) 911 (*encoder_funcs->dpms) (encoder, 912 drm_helper_choose_encoder_dpms(encoder)); 913 } 914 if (crtc) { 915 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; 916 if (crtc_funcs->dpms) 917 (*crtc_funcs->dpms) (crtc, 918 drm_helper_choose_crtc_dpms(crtc)); 919 } 920 } 921 922 return; 923 } 924 EXPORT_SYMBOL(drm_helper_connector_dpms); 925 926 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 927 struct drm_mode_fb_cmd2 *mode_cmd) 928 { 929 int i; 930 931 fb->width = mode_cmd->width; 932 fb->height = mode_cmd->height; 933 for (i = 0; i < 4; i++) { 934 fb->pitches[i] = mode_cmd->pitches[i]; 935 fb->offsets[i] = mode_cmd->offsets[i]; 936 } 937 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, 938 &fb->bits_per_pixel); 939 fb->pixel_format = mode_cmd->pixel_format; 940 941 return 0; 942 } 943 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 944 945 int drm_helper_resume_force_mode(struct drm_device *dev) 946 { 947 struct drm_crtc *crtc; 948 struct drm_encoder *encoder; 949 struct drm_encoder_helper_funcs *encoder_funcs; 950 struct drm_crtc_helper_funcs *crtc_funcs; 951 int ret; 952 953 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 954 955 if (!crtc->enabled) 956 continue; 957 958 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, 959 crtc->x, crtc->y, crtc->fb); 960 961 if (ret == false) 962 DRM_ERROR("failed to set mode on crtc %p\n", crtc); 963 964 /* Turn off outputs that were already powered off */ 965 if (drm_helper_choose_crtc_dpms(crtc)) { 966 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 967 968 if(encoder->crtc != crtc) 969 continue; 970 971 encoder_funcs = encoder->helper_private; 972 if (encoder_funcs->dpms) 973 (*encoder_funcs->dpms) (encoder, 974 drm_helper_choose_encoder_dpms(encoder)); 975 } 976 977 crtc_funcs = crtc->helper_private; 978 if (crtc_funcs->dpms) 979 (*crtc_funcs->dpms) (crtc, 980 drm_helper_choose_crtc_dpms(crtc)); 981 } 982 } 983 /* disable the unused connectors while restoring the modesetting */ 984 drm_helper_disable_unused_functions(dev); 985 return 0; 986 } 987 EXPORT_SYMBOL(drm_helper_resume_force_mode); 988 989 void drm_kms_helper_hotplug_event(struct drm_device *dev) 990 { 991 /* send a uevent + call fbdev */ 992 #if 0 993 drm_sysfs_hotplug_event(dev); 994 #endif 995 if (dev->mode_config.funcs->output_poll_changed) 996 dev->mode_config.funcs->output_poll_changed(dev); 997 } 998 EXPORT_SYMBOL(drm_kms_helper_hotplug_event); 999 1000 #define DRM_OUTPUT_POLL_PERIOD (10*HZ) 1001 static void output_poll_execute(struct work_struct *work) 1002 { 1003 struct delayed_work *delayed_work = to_delayed_work(work); 1004 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); 1005 struct drm_connector *connector; 1006 enum drm_connector_status old_status; 1007 bool repoll = false, changed = false; 1008 1009 if (!drm_kms_helper_poll) 1010 return; 1011 1012 mutex_lock(&dev->mode_config.mutex); 1013 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 1014 1015 /* Ignore forced connectors. */ 1016 if (connector->force) 1017 continue; 1018 1019 /* Ignore HPD capable connectors and connectors where we don't 1020 * want any hotplug detection at all for polling. */ 1021 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) 1022 continue; 1023 1024 repoll = true; 1025 1026 old_status = connector->status; 1027 /* if we are connected and don't want to poll for disconnect 1028 skip it */ 1029 if (old_status == connector_status_connected && 1030 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) 1031 continue; 1032 1033 connector->status = connector->funcs->detect(connector, false); 1034 if (old_status != connector->status) { 1035 const char *old, *new; 1036 1037 old = drm_get_connector_status_name(old_status); 1038 new = drm_get_connector_status_name(connector->status); 1039 1040 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " 1041 "status updated from %s to %s\n", 1042 connector->base.id, 1043 drm_get_connector_name(connector), 1044 old, new); 1045 1046 changed = true; 1047 } 1048 } 1049 1050 mutex_unlock(&dev->mode_config.mutex); 1051 1052 if (changed) 1053 drm_kms_helper_hotplug_event(dev); 1054 1055 if (repoll) 1056 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); 1057 } 1058 1059 void drm_kms_helper_poll_disable(struct drm_device *dev) 1060 { 1061 if (!dev->mode_config.poll_enabled) 1062 return; 1063 cancel_delayed_work_sync(&dev->mode_config.output_poll_work); 1064 } 1065 EXPORT_SYMBOL(drm_kms_helper_poll_disable); 1066 1067 void drm_kms_helper_poll_enable(struct drm_device *dev) 1068 { 1069 bool poll = false; 1070 struct drm_connector *connector; 1071 1072 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) 1073 return; 1074 1075 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 1076 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | 1077 DRM_CONNECTOR_POLL_DISCONNECT)) 1078 poll = true; 1079 } 1080 1081 if (poll) 1082 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); 1083 } 1084 EXPORT_SYMBOL(drm_kms_helper_poll_enable); 1085 1086 void drm_kms_helper_poll_init(struct drm_device *dev) 1087 { 1088 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); 1089 dev->mode_config.poll_enabled = true; 1090 1091 drm_kms_helper_poll_enable(dev); 1092 } 1093 EXPORT_SYMBOL(drm_kms_helper_poll_init); 1094 1095 void drm_kms_helper_poll_fini(struct drm_device *dev) 1096 { 1097 drm_kms_helper_poll_disable(dev); 1098 } 1099 EXPORT_SYMBOL(drm_kms_helper_poll_fini); 1100 1101 void drm_helper_hpd_irq_event(struct drm_device *dev) 1102 { 1103 struct drm_connector *connector; 1104 enum drm_connector_status old_status; 1105 bool changed = false; 1106 1107 if (!dev->mode_config.poll_enabled) 1108 return; 1109 1110 mutex_lock(&dev->mode_config.mutex); 1111 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 1112 1113 /* Only handle HPD capable connectors. */ 1114 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) 1115 continue; 1116 1117 old_status = connector->status; 1118 1119 connector->status = connector->funcs->detect(connector, false); 1120 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", 1121 connector->base.id, 1122 drm_get_connector_name(connector), 1123 drm_get_connector_status_name(old_status), 1124 drm_get_connector_status_name(connector->status)); 1125 if (old_status != connector->status) 1126 changed = true; 1127 } 1128 1129 mutex_unlock(&dev->mode_config.mutex); 1130 1131 if (changed) 1132 drm_kms_helper_hotplug_event(dev); 1133 } 1134 EXPORT_SYMBOL(drm_helper_hpd_irq_event); 1135