drivers/gpu/drm/drm_crtc_helper.c

   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 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  43 {
  44         struct drm_connector *connector, *tmp;
  45         struct list_head panel_list;
  46
  47         INIT_LIST_HEAD(&panel_list);
  48
  49         list_for_each_entry_safe(connector, tmp,
  50                                  &dev->mode_config.connector_list, head) {
  51                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  52                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  53                         list_move_tail(&connector->head, &panel_list);
  54         }
  55
  56         list_splice(&panel_list, &dev->mode_config.connector_list);
  57 }
  58 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  59
  60 static bool drm_kms_helper_poll = true;
  61 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  62
  63 static void drm_mode_validate_flag(struct drm_connector *connector,
  64                                    int flags)
  65 {
  66         struct drm_display_mode *mode;
  67
  68         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  69                 return;
  70
  71         list_for_each_entry(mode, &connector->modes, head) {
  72                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  73                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  74                         mode->status = MODE_NO_INTERLACE;
  75                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  76                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  77                         mode->status = MODE_NO_DBLESCAN;
  78         }
  79
  80         return;
  81 }
  82
  83 /**
  84  * drm_helper_probe_single_connector_modes - get complete set of display modes
  85  * @dev: DRM device
  86  * @maxX: max width for modes
  87  * @maxY: max height for modes
  88  *
  89  * LOCKING:
  90  * Caller must hold mode config lock.
  91  *
  92  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  93  * modes on them.  Modes will first be added to the connector's probed_modes
  94  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  95  * put into the normal modes list.
  96  *
  97  * Intended to be used either at bootup time or when major configuration
  98  * changes have occurred.
  99  *
 100  * FIXME: take into account monitor limits
 101  *
 102  * RETURNS:
 103  * Number of modes found on @connector.
 104  */
 105 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 106                                             uint32_t maxX, uint32_t maxY)
 107 {
 108         struct drm_device *dev = connector->dev;
 109         struct drm_display_mode *mode;
 110         struct drm_connector_helper_funcs *connector_funcs =
 111                 connector->helper_private;
 112         int count = 0;
 113         int mode_flags = 0;
 114
 115         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 116                         drm_get_connector_name(connector));
 117         /* set all modes to the unverified state */
 118         list_for_each_entry(mode, &connector->modes, head)
 119                 mode->status = MODE_UNVERIFIED;
 120
 121         if (connector->force) {
 122                 if (connector->force == DRM_FORCE_ON)
 123                         connector->status = connector_status_connected;
 124                 else
 125                         connector->status = connector_status_disconnected;
 126                 if (connector->funcs->force)
 127                         connector->funcs->force(connector);
 128         } else {
 129                 connector->status = connector->funcs->detect(connector, true);
 130                 drm_kms_helper_poll_enable(dev);
 131         }
 132
 133         if (connector->status == connector_status_disconnected) {
 134                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 135                         connector->base.id, drm_get_connector_name(connector));
 136                 drm_mode_connector_update_edid_property(connector, NULL);
 137                 goto prune;
 138         }
 139
 140 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 141         count = drm_load_edid_firmware(connector);
 142         if (count == 0)
 143 #endif
 144                 count = (*connector_funcs->get_modes)(connector);
 145
 146         if (count == 0 && connector->status == connector_status_connected)
 147                 count = drm_add_modes_noedid(connector, 1024, 768);
 148         if (count == 0)
 149                 goto prune;
 150
 151         drm_mode_connector_list_update(connector);
 152
 153         if (maxX && maxY)
 154                 drm_mode_validate_size(dev, &connector->modes, maxX,
 155                                        maxY, 0);
 156
 157         if (connector->interlace_allowed)
 158                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 159         if (connector->doublescan_allowed)
 160                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 161         drm_mode_validate_flag(connector, mode_flags);
 162
 163         list_for_each_entry(mode, &connector->modes, head) {
 164                 if (mode->status == MODE_OK)
 165                         mode->status = connector_funcs->mode_valid(connector,
 166                                                                    mode);
 167         }
 168
 169 prune:
 170         drm_mode_prune_invalid(dev, &connector->modes, true);
 171
 172         if (list_empty(&connector->modes))
 173                 return 0;
 174
 175         drm_mode_sort(&connector->modes);
 176
 177         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 178                         drm_get_connector_name(connector));
 179         list_for_each_entry(mode, &connector->modes, head) {
 180                 mode->vrefresh = drm_mode_vrefresh(mode);
 181
 182                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 183                 drm_mode_debug_printmodeline(mode);
 184         }
 185
 186         return count;
 187 }
 188 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 189
 190 /**
 191  * drm_helper_encoder_in_use - check if a given encoder is in use
 192  * @encoder: encoder to check
 193  *
 194  * LOCKING:
 195  * Caller must hold mode config lock.
 196  *
 197  * Walk @encoders's DRM device's mode_config and see if it's in use.
 198  *
 199  * RETURNS:
 200  * True if @encoder is part of the mode_config, false otherwise.
 201  */
 202 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 203 {
 204         struct drm_connector *connector;
 205         struct drm_device *dev = encoder->dev;
 206         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 207                 if (connector->encoder == encoder)
 208                         return true;
 209         return false;
 210 }
 211 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 212
 213 /**
 214  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 215  * @crtc: CRTC to check
 216  *
 217  * LOCKING:
 218  * Caller must hold mode config lock.
 219  *
 220  * Walk @crtc's DRM device's mode_config and see if it's in use.
 221  *
 222  * RETURNS:
 223  * True if @crtc is part of the mode_config, false otherwise.
 224  */
 225 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 226 {
 227         struct drm_encoder *encoder;
 228         struct drm_device *dev = crtc->dev;
 229         /* FIXME: Locking around list access? */
 230         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 231                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 232                         return true;
 233         return false;
 234 }
 235 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 236
 237 static void
 238 drm_encoder_disable(struct drm_encoder *encoder)
 239 {
 240         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 241
 242         if (encoder_funcs->disable)
 243                 (*encoder_funcs->disable)(encoder);
 244         else
 245                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 246 }
 247
 248 /**
 249  * drm_helper_disable_unused_functions - disable unused objects
 250  * @dev: DRM device
 251  *
 252  * LOCKING:
 253  * Caller must hold mode config lock.
 254  *
 255  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 256  * by calling its dpms function, which should power it off.
 257  */
 258 void drm_helper_disable_unused_functions(struct drm_device *dev)
 259 {
 260         struct drm_encoder *encoder;
 261         struct drm_connector *connector;
 262         struct drm_crtc *crtc;
 263
 264         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 265                 if (!connector->encoder)
 266                         continue;
 267                 if (connector->status == connector_status_disconnected)
 268                         connector->encoder = NULL;
 269         }
 270
 271         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 272                 if (!drm_helper_encoder_in_use(encoder)) {
 273                         drm_encoder_disable(encoder);
 274                         /* disconnector encoder from any connector */
 275                         encoder->crtc = NULL;
 276                 }
 277         }
 278
 279         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 280                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 281                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 282                 if (!crtc->enabled) {
 283                         if (crtc_funcs->disable)
 284                                 (*crtc_funcs->disable)(crtc);
 285                         else
 286                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 287                         crtc->fb = NULL;
 288                 }
 289         }
 290 }
 291 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 292
 293 /**
 294  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 295  * @encoder: encoder to test
 296  * @crtc: crtc to test
 297  *
 298  * Return false if @encoder can't be driven by @crtc, true otherwise.
 299  */
 300 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 301                                 struct drm_crtc *crtc)
 302 {
 303         struct drm_device *dev;
 304         struct drm_crtc *tmp;
 305         int crtc_mask = 1;
 306
 307         WARN(!crtc, "checking null crtc?\n");
 308
 309         dev = crtc->dev;
 310
 311         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 312                 if (tmp == crtc)
 313                         break;
 314                 crtc_mask <<= 1;
 315         }
 316
 317         if (encoder->possible_crtcs & crtc_mask)
 318                 return true;
 319         return false;
 320 }
 321
 322 /*
 323  * Check the CRTC we're going to map each output to vs. its current
 324  * CRTC.  If they don't match, we have to disable the output and the CRTC
 325  * since the driver will have to re-route things.
 326  */
 327 static void
 328 drm_crtc_prepare_encoders(struct drm_device *dev)
 329 {
 330         struct drm_encoder_helper_funcs *encoder_funcs;
 331         struct drm_encoder *encoder;
 332
 333         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 334                 encoder_funcs = encoder->helper_private;
 335                 /* Disable unused encoders */
 336                 if (encoder->crtc == NULL)
 337                         drm_encoder_disable(encoder);
 338                 /* Disable encoders whose CRTC is about to change */
 339                 if (encoder_funcs->get_crtc &&
 340                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 341                         drm_encoder_disable(encoder);
 342         }
 343 }
 344
 345 /**
 346  * drm_crtc_set_mode - set a mode
 347  * @crtc: CRTC to program
 348  * @mode: mode to use
 349  * @x: width of mode
 350  * @y: height of mode
 351  *
 352  * LOCKING:
 353  * Caller must hold mode config lock.
 354  *
 355  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 356  * to fixup or reject the mode prior to trying to set it.
 357  *
 358  * RETURNS:
 359  * True if the mode was set successfully, or false otherwise.
 360  */
 361 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 362                               struct drm_display_mode *mode,
 363                               int x, int y,
 364                               struct drm_framebuffer *old_fb)
 365 {
 366         struct drm_device *dev = crtc->dev;
 367         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 368         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 369         struct drm_encoder_helper_funcs *encoder_funcs;
 370         int saved_x, saved_y;
 371         struct drm_encoder *encoder;
 372         bool ret = true;
 373
 374         crtc->enabled = drm_helper_crtc_in_use(crtc);
 375         if (!crtc->enabled)
 376                 return true;
 377
 378         adjusted_mode = drm_mode_duplicate(dev, mode);
 379         if (!adjusted_mode)
 380                 return false;
 381
 382         saved_hwmode = crtc->hwmode;
 383         saved_mode = crtc->mode;
 384         saved_x = crtc->x;
 385         saved_y = crtc->y;
 386
 387         /* Update crtc values up front so the driver can rely on them for mode
 388          * setting.
 389          */
 390         crtc->mode = *mode;
 391         crtc->x = x;
 392         crtc->y = y;
 393
 394         /* Pass our mode to the connectors and the CRTC to give them a chance to
 395          * adjust it according to limitations or connector properties, and also
 396          * a chance to reject the mode entirely.
 397          */
 398         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 399
 400                 if (encoder->crtc != crtc)
 401                         continue;
 402                 encoder_funcs = encoder->helper_private;
 403                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 404                                                       adjusted_mode))) {
 405                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 406                         goto done;
 407                 }
 408         }
 409
 410         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 411                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 412                 goto done;
 413         }
 414         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 415
 416         /* Prepare the encoders and CRTCs before setting the mode. */
 417         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 418
 419                 if (encoder->crtc != crtc)
 420                         continue;
 421                 encoder_funcs = encoder->helper_private;
 422                 /* Disable the encoders as the first thing we do. */
 423                 encoder_funcs->prepare(encoder);
 424         }
 425
 426         drm_crtc_prepare_encoders(dev);
 427
 428         crtc_funcs->prepare(crtc);
 429
 430         /* Set up the DPLL and any encoders state that needs to adjust or depend
 431          * on the DPLL.
 432          */
 433         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 434         if (!ret)
 435             goto done;
 436
 437         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 438
 439                 if (encoder->crtc != crtc)
 440                         continue;
 441
 442                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 443                         encoder->base.id, drm_get_encoder_name(encoder),
 444                         mode->base.id, mode->name);
 445                 encoder_funcs = encoder->helper_private;
 446                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 447         }
 448
 449         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 450         crtc_funcs->commit(crtc);
 451
 452         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 453
 454                 if (encoder->crtc != crtc)
 455                         continue;
 456
 457                 encoder_funcs = encoder->helper_private;
 458                 encoder_funcs->commit(encoder);
 459
 460         }
 461
 462         /* Store real post-adjustment hardware mode. */
 463         crtc->hwmode = *adjusted_mode;
 464
 465         /* Calculate and store various constants which
 466          * are later needed by vblank and swap-completion
 467          * timestamping. They are derived from true hwmode.
 468          */
 469         drm_calc_timestamping_constants(crtc);
 470
 471         /* FIXME: add subpixel order */
 472 done:
 473         drm_mode_destroy(dev, adjusted_mode);
 474         if (!ret) {
 475                 crtc->hwmode = saved_hwmode;
 476                 crtc->mode = saved_mode;
 477                 crtc->x = saved_x;
 478                 crtc->y = saved_y;
 479         }
 480
 481         return ret;
 482 }
 483 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 484
 485
 486 static int
 487 drm_crtc_helper_disable(struct drm_crtc *crtc)
 488 {
 489         struct drm_device *dev = crtc->dev;
 490         struct drm_connector *connector;
 491         struct drm_encoder *encoder;
 492
 493         /* Decouple all encoders and their attached connectors from this crtc */
 494         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 495                 if (encoder->crtc != crtc)
 496                         continue;
 497
 498                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 499                         if (connector->encoder != encoder)
 500                                 continue;
 501
 502                         connector->encoder = NULL;
 503                 }
 504         }
 505
 506         drm_helper_disable_unused_functions(dev);
 507         return 0;
 508 }
 509
 510 /**
 511  * drm_crtc_helper_set_config - set a new config from userspace
 512  * @crtc: CRTC to setup
 513  * @crtc_info: user provided configuration
 514  * @new_mode: new mode to set
 515  * @connector_set: set of connectors for the new config
 516  * @fb: new framebuffer
 517  *
 518  * LOCKING:
 519  * Caller must hold mode config lock.
 520  *
 521  * Setup a new configuration, provided by the user in @crtc_info, and enable
 522  * it.
 523  *
 524  * RETURNS:
 525  * Zero. (FIXME)
 526  */
 527 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 528 {
 529         struct drm_device *dev;
 530         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 531         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 532         struct drm_framebuffer *old_fb = NULL;
 533         bool mode_changed = false; /* if true do a full mode set */
 534         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 535         struct drm_connector *save_connectors, *connector;
 536         int count = 0, ro, fail = 0;
 537         struct drm_crtc_helper_funcs *crtc_funcs;
 538         struct drm_mode_set save_set;
 539         int ret;
 540         int i;
 541
 542         DRM_DEBUG_KMS("\n");
 543
 544         if (!set)
 545                 return -EINVAL;
 546
 547         if (!set->crtc)
 548                 return -EINVAL;
 549
 550         if (!set->crtc->helper_private)
 551                 return -EINVAL;
 552
 553         crtc_funcs = set->crtc->helper_private;
 554
 555         if (!set->mode)
 556                 set->fb = NULL;
 557
 558         if (set->fb) {
 559                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 560                                 set->crtc->base.id, set->fb->base.id,
 561                                 (int)set->num_connectors, set->x, set->y);
 562         } else {
 563                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 564                 return drm_crtc_helper_disable(set->crtc);
 565         }
 566
 567         dev = set->crtc->dev;
 568
 569         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 570          * connector data. */
 571         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 572                              sizeof(struct drm_crtc), GFP_KERNEL);
 573         if (!save_crtcs)
 574                 return -ENOMEM;
 575
 576         save_encoders = kzalloc(dev->mode_config.num_encoder *
 577                                 sizeof(struct drm_encoder), GFP_KERNEL);
 578         if (!save_encoders) {
 579                 kfree(save_crtcs);
 580                 return -ENOMEM;
 581         }
 582
 583         save_connectors = kzalloc(dev->mode_config.num_connector *
 584                                 sizeof(struct drm_connector), GFP_KERNEL);
 585         if (!save_connectors) {
 586                 kfree(save_crtcs);
 587                 kfree(save_encoders);
 588                 return -ENOMEM;
 589         }
 590
 591         /* Copy data. Note that driver private data is not affected.
 592          * Should anything bad happen only the expected state is
 593          * restored, not the drivers personal bookkeeping.
 594          */
 595         count = 0;
 596         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 597                 save_crtcs[count++] = *crtc;
 598         }
 599
 600         count = 0;
 601         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 602                 save_encoders[count++] = *encoder;
 603         }
 604
 605         count = 0;
 606         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 607                 save_connectors[count++] = *connector;
 608         }
 609
 610         save_set.crtc = set->crtc;
 611         save_set.mode = &set->crtc->mode;
 612         save_set.x = set->crtc->x;
 613         save_set.y = set->crtc->y;
 614         save_set.fb = set->crtc->fb;
 615
 616         /* We should be able to check here if the fb has the same properties
 617          * and then just flip_or_move it */
 618         if (set->crtc->fb != set->fb) {
 619                 /* If we have no fb then treat it as a full mode set */
 620                 if (set->crtc->fb == NULL) {
 621                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 622                         mode_changed = true;
 623                 } else if (set->fb == NULL) {
 624                         mode_changed = true;
 625                 } else if (set->fb->depth != set->crtc->fb->depth) {
 626                         mode_changed = true;
 627                 } else if (set->fb->bits_per_pixel !=
 628                            set->crtc->fb->bits_per_pixel) {
 629                         mode_changed = true;
 630                 } else
 631                         fb_changed = true;
 632         }
 633
 634         if (set->x != set->crtc->x || set->y != set->crtc->y)
 635                 fb_changed = true;
 636
 637         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 638                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 639                 drm_mode_debug_printmodeline(&set->crtc->mode);
 640                 drm_mode_debug_printmodeline(set->mode);
 641                 mode_changed = true;
 642         }
 643
 644         /* a) traverse passed in connector list and get encoders for them */
 645         count = 0;
 646         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 647                 struct drm_connector_helper_funcs *connector_funcs =
 648                         connector->helper_private;
 649                 new_encoder = connector->encoder;
 650                 for (ro = 0; ro < set->num_connectors; ro++) {
 651                         if (set->connectors[ro] == connector) {
 652                                 new_encoder = connector_funcs->best_encoder(connector);
 653                                 /* if we can't get an encoder for a connector
 654                                    we are setting now - then fail */
 655                                 if (new_encoder == NULL)
 656                                         /* don't break so fail path works correct */
 657                                         fail = 1;
 658                                 break;
 659                         }
 660                 }
 661
 662                 if (new_encoder != connector->encoder) {
 663                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 664                         mode_changed = true;
 665                         /* If the encoder is reused for another connector, then
 666                          * the appropriate crtc will be set later.
 667                          */
 668                         if (connector->encoder)
 669                                 connector->encoder->crtc = NULL;
 670                         connector->encoder = new_encoder;
 671                 }
 672         }
 673
 674         if (fail) {
 675                 ret = -EINVAL;
 676                 goto fail;
 677         }
 678
 679         count = 0;
 680         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 681                 if (!connector->encoder)
 682                         continue;
 683
 684                 if (connector->encoder->crtc == set->crtc)
 685                         new_crtc = NULL;
 686                 else
 687                         new_crtc = connector->encoder->crtc;
 688
 689                 for (ro = 0; ro < set->num_connectors; ro++) {
 690                         if (set->connectors[ro] == connector)
 691                                 new_crtc = set->crtc;
 692                 }
 693
 694                 /* Make sure the new CRTC will work with the encoder */
 695                 if (new_crtc &&
 696                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 697                         ret = -EINVAL;
 698                         goto fail;
 699                 }
 700                 if (new_crtc != connector->encoder->crtc) {
 701                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 702                         mode_changed = true;
 703                         connector->encoder->crtc = new_crtc;
 704                 }
 705                 if (new_crtc) {
 706                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 707                                 connector->base.id, drm_get_connector_name(connector),
 708                                 new_crtc->base.id);
 709                 } else {
 710                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 711                                 connector->base.id, drm_get_connector_name(connector));
 712                 }
 713         }
 714
 715         /* mode_set_base is not a required function */
 716         if (fb_changed && !crtc_funcs->mode_set_base)
 717                 mode_changed = true;
 718
 719         if (mode_changed) {
 720                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 721                 if (set->crtc->enabled) {
 722                         DRM_DEBUG_KMS("attempting to set mode from"
 723                                         " userspace\n");
 724                         drm_mode_debug_printmodeline(set->mode);
 725                         old_fb = set->crtc->fb;
 726                         set->crtc->fb = set->fb;
 727                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 728                                                       set->x, set->y,
 729                                                       old_fb)) {
 730                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 731                                           set->crtc->base.id);
 732                                 set->crtc->fb = old_fb;
 733                                 ret = -EINVAL;
 734                                 goto fail;
 735                         }
 736                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 737                         for (i = 0; i < set->num_connectors; i++) {
 738                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 739                                               drm_get_connector_name(set->connectors[i]));
 740                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 741                         }
 742                 }
 743                 drm_helper_disable_unused_functions(dev);
 744         } else if (fb_changed) {
 745                 set->crtc->x = set->x;
 746                 set->crtc->y = set->y;
 747
 748                 old_fb = set->crtc->fb;
 749                 if (set->crtc->fb != set->fb)
 750                         set->crtc->fb = set->fb;
 751                 ret = crtc_funcs->mode_set_base(set->crtc,
 752                                                 set->x, set->y, old_fb);
 753                 if (ret != 0) {
 754                         set->crtc->fb = old_fb;
 755                         goto fail;
 756                 }
 757         }
 758
 759         kfree(save_connectors);
 760         kfree(save_encoders);
 761         kfree(save_crtcs);
 762         return 0;
 763
 764 fail:
 765         /* Restore all previous data. */
 766         count = 0;
 767         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 768                 *crtc = save_crtcs[count++];
 769         }
 770
 771         count = 0;
 772         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 773                 *encoder = save_encoders[count++];
 774         }
 775
 776         count = 0;
 777         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 778                 *connector = save_connectors[count++];
 779         }
 780
 781         /* Try to restore the config */
 782         if (mode_changed &&
 783             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 784                                       save_set.y, save_set.fb))
 785                 DRM_ERROR("failed to restore config after modeset failure\n");
 786
 787         kfree(save_connectors);
 788         kfree(save_encoders);
 789         kfree(save_crtcs);
 790         return ret;
 791 }
 792 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 793
 794 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 795 {
 796         int dpms = DRM_MODE_DPMS_OFF;
 797         struct drm_connector *connector;
 798         struct drm_device *dev = encoder->dev;
 799
 800         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 801                 if (connector->encoder == encoder)
 802                         if (connector->dpms < dpms)
 803                                 dpms = connector->dpms;
 804         return dpms;
 805 }
 806
 807 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 808 {
 809         int dpms = DRM_MODE_DPMS_OFF;
 810         struct drm_connector *connector;
 811         struct drm_device *dev = crtc->dev;
 812
 813         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 814                 if (connector->encoder && connector->encoder->crtc == crtc)
 815                         if (connector->dpms < dpms)
 816                                 dpms = connector->dpms;
 817         return dpms;
 818 }
 819
 820 /**
 821  * drm_helper_connector_dpms
 822  * @connector affected connector
 823  * @mode DPMS mode
 824  *
 825  * Calls the low-level connector DPMS function, then
 826  * calls appropriate encoder and crtc DPMS functions as well
 827  */
 828 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 829 {
 830         struct drm_encoder *encoder = connector->encoder;
 831         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 832         int old_dpms;
 833
 834         if (mode == connector->dpms)
 835                 return;
 836
 837         old_dpms = connector->dpms;
 838         connector->dpms = mode;
 839
 840         /* from off to on, do crtc then encoder */
 841         if (mode < old_dpms) {
 842                 if (crtc) {
 843                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 844                         if (crtc_funcs->dpms)
 845                                 (*crtc_funcs->dpms) (crtc,
 846                                                      drm_helper_choose_crtc_dpms(crtc));
 847                 }
 848                 if (encoder) {
 849                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 850                         if (encoder_funcs->dpms)
 851                                 (*encoder_funcs->dpms) (encoder,
 852                                                         drm_helper_choose_encoder_dpms(encoder));
 853                 }
 854         }
 855
 856         /* from on to off, do encoder then crtc */
 857         if (mode > old_dpms) {
 858                 if (encoder) {
 859                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 860                         if (encoder_funcs->dpms)
 861                                 (*encoder_funcs->dpms) (encoder,
 862                                                         drm_helper_choose_encoder_dpms(encoder));
 863                 }
 864                 if (crtc) {
 865                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 866                         if (crtc_funcs->dpms)
 867                                 (*crtc_funcs->dpms) (crtc,
 868                                                      drm_helper_choose_crtc_dpms(crtc));
 869                 }
 870         }
 871
 872         return;
 873 }
 874 EXPORT_SYMBOL(drm_helper_connector_dpms);
 875
 876 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 877                                    struct drm_mode_fb_cmd2 *mode_cmd)
 878 {
 879         int i;
 880
 881         fb->width = mode_cmd->width;
 882         fb->height = mode_cmd->height;
 883         for (i = 0; i < 4; i++) {
 884                 fb->pitches[i] = mode_cmd->pitches[i];
 885                 fb->offsets[i] = mode_cmd->offsets[i];
 886         }
 887         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 888                                     &fb->bits_per_pixel);
 889         fb->pixel_format = mode_cmd->pixel_format;
 890
 891         return 0;
 892 }
 893 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 894
 895 int drm_helper_resume_force_mode(struct drm_device *dev)
 896 {
 897         struct drm_crtc *crtc;
 898         struct drm_encoder *encoder;
 899         struct drm_encoder_helper_funcs *encoder_funcs;
 900         struct drm_crtc_helper_funcs *crtc_funcs;
 901         int ret;
 902
 903         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 904
 905                 if (!crtc->enabled)
 906                         continue;
 907
 908                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 909                                                crtc->x, crtc->y, crtc->fb);
 910
 911                 if (ret == false)
 912                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 913
 914                 /* Turn off outputs that were already powered off */
 915                 if (drm_helper_choose_crtc_dpms(crtc)) {
 916                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 917
 918                                 if(encoder->crtc != crtc)
 919                                         continue;
 920
 921                                 encoder_funcs = encoder->helper_private;
 922                                 if (encoder_funcs->dpms)
 923                                         (*encoder_funcs->dpms) (encoder,
 924                                                                 drm_helper_choose_encoder_dpms(encoder));
 925                         }
 926
 927                         crtc_funcs = crtc->helper_private;
 928                         if (crtc_funcs->dpms)
 929                                 (*crtc_funcs->dpms) (crtc,
 930                                                      drm_helper_choose_crtc_dpms(crtc));
 931                 }
 932         }
 933         /* disable the unused connectors while restoring the modesetting */
 934         drm_helper_disable_unused_functions(dev);
 935         return 0;
 936 }
 937 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 938
 939 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 940 static void output_poll_execute(struct work_struct *work)
 941 {
 942         struct delayed_work *delayed_work = to_delayed_work(work);
 943         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 944         struct drm_connector *connector;
 945         enum drm_connector_status old_status;
 946         bool repoll = false, changed = false;
 947
 948         if (!drm_kms_helper_poll)
 949                 return;
 950
 951         mutex_lock(&dev->mode_config.mutex);
 952         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 953
 954                 /* if this is HPD or polled don't check it -
 955                    TV out for instance */
 956                 if (!connector->polled)
 957                         continue;
 958
 959                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
 960                         repoll = true;
 961
 962                 old_status = connector->status;
 963                 /* if we are connected and don't want to poll for disconnect
 964                    skip it */
 965                 if (old_status == connector_status_connected &&
 966                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 967                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 968                         continue;
 969
 970                 connector->status = connector->funcs->detect(connector, false);
 971                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 972                               connector->base.id,
 973                               drm_get_connector_name(connector),
 974                               old_status, connector->status);
 975                 if (old_status != connector->status)
 976                         changed = true;
 977         }
 978
 979         mutex_unlock(&dev->mode_config.mutex);
 980
 981         if (changed) {
 982                 /* send a uevent + call fbdev */
 983                 drm_sysfs_hotplug_event(dev);
 984                 if (dev->mode_config.funcs->output_poll_changed)
 985                         dev->mode_config.funcs->output_poll_changed(dev);
 986         }
 987
 988         if (repoll)
 989                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
 990 }
 991
 992 void drm_kms_helper_poll_disable(struct drm_device *dev)
 993 {
 994         if (!dev->mode_config.poll_enabled)
 995                 return;
 996         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
 997 }
 998 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 999
1000 void drm_kms_helper_poll_enable(struct drm_device *dev)
1001 {
1002         bool poll = false;
1003         struct drm_connector *connector;
1004
1005         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1006                 return;
1007
1008         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1009                 if (connector->polled)
1010                         poll = true;
1011         }
1012
1013         if (poll)
1014                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1015 }
1016 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1017
1018 void drm_kms_helper_poll_init(struct drm_device *dev)
1019 {
1020         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1021         dev->mode_config.poll_enabled = true;
1022
1023         drm_kms_helper_poll_enable(dev);
1024 }
1025 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1026
1027 void drm_kms_helper_poll_fini(struct drm_device *dev)
1028 {
1029         drm_kms_helper_poll_disable(dev);
1030 }
1031 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1032
1033 void drm_helper_hpd_irq_event(struct drm_device *dev)
1034 {
1035         if (!dev->mode_config.poll_enabled)
1036                 return;
1037
1038         /* kill timer and schedule immediate execution, this doesn't block */
1039         cancel_delayed_work(&dev->mode_config.output_poll_work);
1040         if (drm_kms_helper_poll)
1041                 schedule_delayed_work(&dev->mode_config.output_poll_work, 0);
1042 }
1043 EXPORT_SYMBOL(drm_helper_hpd_irq_event);