Pileus Git - ~andy/linux/blob - 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         }
 131
 132         /* Re-enable polling in case the global poll config changed. */
 133         if (drm_kms_helper_poll != dev->mode_config.poll_running)
 134                 drm_kms_helper_poll_enable(dev);
 135
 136         dev->mode_config.poll_running = drm_kms_helper_poll;
 137
 138         if (connector->status == connector_status_disconnected) {
 139                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 140                         connector->base.id, drm_get_connector_name(connector));
 141                 drm_mode_connector_update_edid_property(connector, NULL);
 142                 goto prune;
 143         }
 144
 145 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 146         count = drm_load_edid_firmware(connector);
 147         if (count == 0)
 148 #endif
 149                 count = (*connector_funcs->get_modes)(connector);
 150
 151         if (count == 0 && connector->status == connector_status_connected)
 152                 count = drm_add_modes_noedid(connector, 1024, 768);
 153         if (count == 0)
 154                 goto prune;
 155
 156         drm_mode_connector_list_update(connector);
 157
 158         if (maxX && maxY)
 159                 drm_mode_validate_size(dev, &connector->modes, maxX,
 160                                        maxY, 0);
 161
 162         if (connector->interlace_allowed)
 163                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 164         if (connector->doublescan_allowed)
 165                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 166         drm_mode_validate_flag(connector, mode_flags);
 167
 168         list_for_each_entry(mode, &connector->modes, head) {
 169                 if (mode->status == MODE_OK)
 170                         mode->status = connector_funcs->mode_valid(connector,
 171                                                                    mode);
 172         }
 173
 174 prune:
 175         drm_mode_prune_invalid(dev, &connector->modes, true);
 176
 177         if (list_empty(&connector->modes))
 178                 return 0;
 179
 180         drm_mode_sort(&connector->modes);
 181
 182         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 183                         drm_get_connector_name(connector));
 184         list_for_each_entry(mode, &connector->modes, head) {
 185                 mode->vrefresh = drm_mode_vrefresh(mode);
 186
 187                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 188                 drm_mode_debug_printmodeline(mode);
 189         }
 190
 191         return count;
 192 }
 193 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 194
 195 /**
 196  * drm_helper_encoder_in_use - check if a given encoder is in use
 197  * @encoder: encoder to check
 198  *
 199  * LOCKING:
 200  * Caller must hold mode config lock.
 201  *
 202  * Walk @encoders's DRM device's mode_config and see if it's in use.
 203  *
 204  * RETURNS:
 205  * True if @encoder is part of the mode_config, false otherwise.
 206  */
 207 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 208 {
 209         struct drm_connector *connector;
 210         struct drm_device *dev = encoder->dev;
 211         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 212                 if (connector->encoder == encoder)
 213                         return true;
 214         return false;
 215 }
 216 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 217
 218 /**
 219  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 220  * @crtc: CRTC to check
 221  *
 222  * LOCKING:
 223  * Caller must hold mode config lock.
 224  *
 225  * Walk @crtc's DRM device's mode_config and see if it's in use.
 226  *
 227  * RETURNS:
 228  * True if @crtc is part of the mode_config, false otherwise.
 229  */
 230 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 231 {
 232         struct drm_encoder *encoder;
 233         struct drm_device *dev = crtc->dev;
 234         /* FIXME: Locking around list access? */
 235         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 236                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 237                         return true;
 238         return false;
 239 }
 240 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 241
 242 static void
 243 drm_encoder_disable(struct drm_encoder *encoder)
 244 {
 245         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 246
 247         if (encoder_funcs->disable)
 248                 (*encoder_funcs->disable)(encoder);
 249         else
 250                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 251 }
 252
 253 /**
 254  * drm_helper_disable_unused_functions - disable unused objects
 255  * @dev: DRM device
 256  *
 257  * LOCKING:
 258  * Caller must hold mode config lock.
 259  *
 260  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 261  * by calling its dpms function, which should power it off.
 262  */
 263 void drm_helper_disable_unused_functions(struct drm_device *dev)
 264 {
 265         struct drm_encoder *encoder;
 266         struct drm_connector *connector;
 267         struct drm_crtc *crtc;
 268
 269         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 270                 if (!connector->encoder)
 271                         continue;
 272                 if (connector->status == connector_status_disconnected)
 273                         connector->encoder = NULL;
 274         }
 275
 276         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 277                 if (!drm_helper_encoder_in_use(encoder)) {
 278                         drm_encoder_disable(encoder);
 279                         /* disconnector encoder from any connector */
 280                         encoder->crtc = NULL;
 281                 }
 282         }
 283
 284         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 285                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 286                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 287                 if (!crtc->enabled) {
 288                         if (crtc_funcs->disable)
 289                                 (*crtc_funcs->disable)(crtc);
 290                         else
 291                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 292                         crtc->fb = NULL;
 293                 }
 294         }
 295 }
 296 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 297
 298 /**
 299  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 300  * @encoder: encoder to test
 301  * @crtc: crtc to test
 302  *
 303  * Return false if @encoder can't be driven by @crtc, true otherwise.
 304  */
 305 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 306                                 struct drm_crtc *crtc)
 307 {
 308         struct drm_device *dev;
 309         struct drm_crtc *tmp;
 310         int crtc_mask = 1;
 311
 312         WARN(!crtc, "checking null crtc?\n");
 313
 314         dev = crtc->dev;
 315
 316         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 317                 if (tmp == crtc)
 318                         break;
 319                 crtc_mask <<= 1;
 320         }
 321
 322         if (encoder->possible_crtcs & crtc_mask)
 323                 return true;
 324         return false;
 325 }
 326
 327 /*
 328  * Check the CRTC we're going to map each output to vs. its current
 329  * CRTC.  If they don't match, we have to disable the output and the CRTC
 330  * since the driver will have to re-route things.
 331  */
 332 static void
 333 drm_crtc_prepare_encoders(struct drm_device *dev)
 334 {
 335         struct drm_encoder_helper_funcs *encoder_funcs;
 336         struct drm_encoder *encoder;
 337
 338         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 339                 encoder_funcs = encoder->helper_private;
 340                 /* Disable unused encoders */
 341                 if (encoder->crtc == NULL)
 342                         drm_encoder_disable(encoder);
 343                 /* Disable encoders whose CRTC is about to change */
 344                 if (encoder_funcs->get_crtc &&
 345                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 346                         drm_encoder_disable(encoder);
 347         }
 348 }
 349
 350 /**
 351  * drm_crtc_set_mode - set a mode
 352  * @crtc: CRTC to program
 353  * @mode: mode to use
 354  * @x: horizontal offset into the surface
 355  * @y: vertical offset into the surface
 356  *
 357  * LOCKING:
 358  * Caller must hold mode config lock.
 359  *
 360  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 361  * to fixup or reject the mode prior to trying to set it.
 362  *
 363  * RETURNS:
 364  * True if the mode was set successfully, or false otherwise.
 365  */
 366 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 367                               struct drm_display_mode *mode,
 368                               int x, int y,
 369                               struct drm_framebuffer *old_fb)
 370 {
 371         struct drm_device *dev = crtc->dev;
 372         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 373         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 374         struct drm_encoder_helper_funcs *encoder_funcs;
 375         int saved_x, saved_y;
 376         struct drm_encoder *encoder;
 377         bool ret = true;
 378
 379         crtc->enabled = drm_helper_crtc_in_use(crtc);
 380         if (!crtc->enabled)
 381                 return true;
 382
 383         adjusted_mode = drm_mode_duplicate(dev, mode);
 384         if (!adjusted_mode)
 385                 return false;
 386
 387         saved_hwmode = crtc->hwmode;
 388         saved_mode = crtc->mode;
 389         saved_x = crtc->x;
 390         saved_y = crtc->y;
 391
 392         /* Update crtc values up front so the driver can rely on them for mode
 393          * setting.
 394          */
 395         crtc->mode = *mode;
 396         crtc->x = x;
 397         crtc->y = y;
 398
 399         /* Pass our mode to the connectors and the CRTC to give them a chance to
 400          * adjust it according to limitations or connector properties, and also
 401          * a chance to reject the mode entirely.
 402          */
 403         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 404
 405                 if (encoder->crtc != crtc)
 406                         continue;
 407                 encoder_funcs = encoder->helper_private;
 408                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 409                                                       adjusted_mode))) {
 410                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 411                         goto done;
 412                 }
 413         }
 414
 415         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 416                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 417                 goto done;
 418         }
 419         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 420
 421         /* Prepare the encoders and CRTCs before setting the mode. */
 422         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 423
 424                 if (encoder->crtc != crtc)
 425                         continue;
 426                 encoder_funcs = encoder->helper_private;
 427                 /* Disable the encoders as the first thing we do. */
 428                 encoder_funcs->prepare(encoder);
 429         }
 430
 431         drm_crtc_prepare_encoders(dev);
 432
 433         crtc_funcs->prepare(crtc);
 434
 435         /* Set up the DPLL and any encoders state that needs to adjust or depend
 436          * on the DPLL.
 437          */
 438         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 439         if (!ret)
 440             goto done;
 441
 442         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 443
 444                 if (encoder->crtc != crtc)
 445                         continue;
 446
 447                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 448                         encoder->base.id, drm_get_encoder_name(encoder),
 449                         mode->base.id, mode->name);
 450                 encoder_funcs = encoder->helper_private;
 451                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 452         }
 453
 454         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 455         crtc_funcs->commit(crtc);
 456
 457         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 458
 459                 if (encoder->crtc != crtc)
 460                         continue;
 461
 462                 encoder_funcs = encoder->helper_private;
 463                 encoder_funcs->commit(encoder);
 464
 465         }
 466
 467         /* Store real post-adjustment hardware mode. */
 468         crtc->hwmode = *adjusted_mode;
 469
 470         /* Calculate and store various constants which
 471          * are later needed by vblank and swap-completion
 472          * timestamping. They are derived from true hwmode.
 473          */
 474         drm_calc_timestamping_constants(crtc);
 475
 476         /* FIXME: add subpixel order */
 477 done:
 478         drm_mode_destroy(dev, adjusted_mode);
 479         if (!ret) {
 480                 crtc->hwmode = saved_hwmode;
 481                 crtc->mode = saved_mode;
 482                 crtc->x = saved_x;
 483                 crtc->y = saved_y;
 484         }
 485
 486         return ret;
 487 }
 488 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 489
 490
 491 static int
 492 drm_crtc_helper_disable(struct drm_crtc *crtc)
 493 {
 494         struct drm_device *dev = crtc->dev;
 495         struct drm_connector *connector;
 496         struct drm_encoder *encoder;
 497
 498         /* Decouple all encoders and their attached connectors from this crtc */
 499         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 500                 if (encoder->crtc != crtc)
 501                         continue;
 502
 503                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 504                         if (connector->encoder != encoder)
 505                                 continue;
 506
 507                         connector->encoder = NULL;
 508                 }
 509         }
 510
 511         drm_helper_disable_unused_functions(dev);
 512         return 0;
 513 }
 514
 515 /**
 516  * drm_crtc_helper_set_config - set a new config from userspace
 517  * @crtc: CRTC to setup
 518  * @crtc_info: user provided configuration
 519  * @new_mode: new mode to set
 520  * @connector_set: set of connectors for the new config
 521  * @fb: new framebuffer
 522  *
 523  * LOCKING:
 524  * Caller must hold mode config lock.
 525  *
 526  * Setup a new configuration, provided by the user in @crtc_info, and enable
 527  * it.
 528  *
 529  * RETURNS:
 530  * Zero. (FIXME)
 531  */
 532 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 533 {
 534         struct drm_device *dev;
 535         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 536         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 537         struct drm_framebuffer *old_fb = NULL;
 538         bool mode_changed = false; /* if true do a full mode set */
 539         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 540         struct drm_connector *save_connectors, *connector;
 541         int count = 0, ro, fail = 0;
 542         struct drm_crtc_helper_funcs *crtc_funcs;
 543         struct drm_mode_set save_set;
 544         int ret;
 545         int i;
 546
 547         DRM_DEBUG_KMS("\n");
 548
 549         if (!set)
 550                 return -EINVAL;
 551
 552         if (!set->crtc)
 553                 return -EINVAL;
 554
 555         if (!set->crtc->helper_private)
 556                 return -EINVAL;
 557
 558         crtc_funcs = set->crtc->helper_private;
 559
 560         if (!set->mode)
 561                 set->fb = NULL;
 562
 563         if (set->fb) {
 564                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 565                                 set->crtc->base.id, set->fb->base.id,
 566                                 (int)set->num_connectors, set->x, set->y);
 567         } else {
 568                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 569                 return drm_crtc_helper_disable(set->crtc);
 570         }
 571
 572         dev = set->crtc->dev;
 573
 574         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 575          * connector data. */
 576         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 577                              sizeof(struct drm_crtc), GFP_KERNEL);
 578         if (!save_crtcs)
 579                 return -ENOMEM;
 580
 581         save_encoders = kzalloc(dev->mode_config.num_encoder *
 582                                 sizeof(struct drm_encoder), GFP_KERNEL);
 583         if (!save_encoders) {
 584                 kfree(save_crtcs);
 585                 return -ENOMEM;
 586         }
 587
 588         save_connectors = kzalloc(dev->mode_config.num_connector *
 589                                 sizeof(struct drm_connector), GFP_KERNEL);
 590         if (!save_connectors) {
 591                 kfree(save_crtcs);
 592                 kfree(save_encoders);
 593                 return -ENOMEM;
 594         }
 595
 596         /* Copy data. Note that driver private data is not affected.
 597          * Should anything bad happen only the expected state is
 598          * restored, not the drivers personal bookkeeping.
 599          */
 600         count = 0;
 601         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 602                 save_crtcs[count++] = *crtc;
 603         }
 604
 605         count = 0;
 606         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 607                 save_encoders[count++] = *encoder;
 608         }
 609
 610         count = 0;
 611         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 612                 save_connectors[count++] = *connector;
 613         }
 614
 615         save_set.crtc = set->crtc;
 616         save_set.mode = &set->crtc->mode;
 617         save_set.x = set->crtc->x;
 618         save_set.y = set->crtc->y;
 619         save_set.fb = set->crtc->fb;
 620
 621         /* We should be able to check here if the fb has the same properties
 622          * and then just flip_or_move it */
 623         if (set->crtc->fb != set->fb) {
 624                 /* If we have no fb then treat it as a full mode set */
 625                 if (set->crtc->fb == NULL) {
 626                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 627                         mode_changed = true;
 628                 } else if (set->fb == NULL) {
 629                         mode_changed = true;
 630                 } else if (set->fb->depth != set->crtc->fb->depth) {
 631                         mode_changed = true;
 632                 } else if (set->fb->bits_per_pixel !=
 633                            set->crtc->fb->bits_per_pixel) {
 634                         mode_changed = true;
 635                 } else
 636                         fb_changed = true;
 637         }
 638
 639         if (set->x != set->crtc->x || set->y != set->crtc->y)
 640                 fb_changed = true;
 641
 642         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 643                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 644                 drm_mode_debug_printmodeline(&set->crtc->mode);
 645                 drm_mode_debug_printmodeline(set->mode);
 646                 mode_changed = true;
 647         }
 648
 649         /* a) traverse passed in connector list and get encoders for them */
 650         count = 0;
 651         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 652                 struct drm_connector_helper_funcs *connector_funcs =
 653                         connector->helper_private;
 654                 new_encoder = connector->encoder;
 655                 for (ro = 0; ro < set->num_connectors; ro++) {
 656                         if (set->connectors[ro] == connector) {
 657                                 new_encoder = connector_funcs->best_encoder(connector);
 658                                 /* if we can't get an encoder for a connector
 659                                    we are setting now - then fail */
 660                                 if (new_encoder == NULL)
 661                                         /* don't break so fail path works correct */
 662                                         fail = 1;
 663                                 break;
 664                         }
 665                 }
 666
 667                 if (new_encoder != connector->encoder) {
 668                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 669                         mode_changed = true;
 670                         /* If the encoder is reused for another connector, then
 671                          * the appropriate crtc will be set later.
 672                          */
 673                         if (connector->encoder)
 674                                 connector->encoder->crtc = NULL;
 675                         connector->encoder = new_encoder;
 676                 }
 677         }
 678
 679         if (fail) {
 680                 ret = -EINVAL;
 681                 goto fail;
 682         }
 683
 684         count = 0;
 685         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 686                 if (!connector->encoder)
 687                         continue;
 688
 689                 if (connector->encoder->crtc == set->crtc)
 690                         new_crtc = NULL;
 691                 else
 692                         new_crtc = connector->encoder->crtc;
 693
 694                 for (ro = 0; ro < set->num_connectors; ro++) {
 695                         if (set->connectors[ro] == connector)
 696                                 new_crtc = set->crtc;
 697                 }
 698
 699                 /* Make sure the new CRTC will work with the encoder */
 700                 if (new_crtc &&
 701                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 702                         ret = -EINVAL;
 703                         goto fail;
 704                 }
 705                 if (new_crtc != connector->encoder->crtc) {
 706                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 707                         mode_changed = true;
 708                         connector->encoder->crtc = new_crtc;
 709                 }
 710                 if (new_crtc) {
 711                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 712                                 connector->base.id, drm_get_connector_name(connector),
 713                                 new_crtc->base.id);
 714                 } else {
 715                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 716                                 connector->base.id, drm_get_connector_name(connector));
 717                 }
 718         }
 719
 720         /* mode_set_base is not a required function */
 721         if (fb_changed && !crtc_funcs->mode_set_base)
 722                 mode_changed = true;
 723
 724         if (mode_changed) {
 725                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 726                 if (set->crtc->enabled) {
 727                         DRM_DEBUG_KMS("attempting to set mode from"
 728                                         " userspace\n");
 729                         drm_mode_debug_printmodeline(set->mode);
 730                         old_fb = set->crtc->fb;
 731                         set->crtc->fb = set->fb;
 732                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 733                                                       set->x, set->y,
 734                                                       old_fb)) {
 735                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 736                                           set->crtc->base.id);
 737                                 set->crtc->fb = old_fb;
 738                                 ret = -EINVAL;
 739                                 goto fail;
 740                         }
 741                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 742                         for (i = 0; i < set->num_connectors; i++) {
 743                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 744                                               drm_get_connector_name(set->connectors[i]));
 745                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 746                         }
 747                 }
 748                 drm_helper_disable_unused_functions(dev);
 749         } else if (fb_changed) {
 750                 set->crtc->x = set->x;
 751                 set->crtc->y = set->y;
 752
 753                 old_fb = set->crtc->fb;
 754                 if (set->crtc->fb != set->fb)
 755                         set->crtc->fb = set->fb;
 756                 ret = crtc_funcs->mode_set_base(set->crtc,
 757                                                 set->x, set->y, old_fb);
 758                 if (ret != 0) {
 759                         set->crtc->fb = old_fb;
 760                         goto fail;
 761                 }
 762         }
 763
 764         kfree(save_connectors);
 765         kfree(save_encoders);
 766         kfree(save_crtcs);
 767         return 0;
 768
 769 fail:
 770         /* Restore all previous data. */
 771         count = 0;
 772         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 773                 *crtc = save_crtcs[count++];
 774         }
 775
 776         count = 0;
 777         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 778                 *encoder = save_encoders[count++];
 779         }
 780
 781         count = 0;
 782         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 783                 *connector = save_connectors[count++];
 784         }
 785
 786         /* Try to restore the config */
 787         if (mode_changed &&
 788             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 789                                       save_set.y, save_set.fb))
 790                 DRM_ERROR("failed to restore config after modeset failure\n");
 791
 792         kfree(save_connectors);
 793         kfree(save_encoders);
 794         kfree(save_crtcs);
 795         return ret;
 796 }
 797 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 798
 799 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 800 {
 801         int dpms = DRM_MODE_DPMS_OFF;
 802         struct drm_connector *connector;
 803         struct drm_device *dev = encoder->dev;
 804
 805         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 806                 if (connector->encoder == encoder)
 807                         if (connector->dpms < dpms)
 808                                 dpms = connector->dpms;
 809         return dpms;
 810 }
 811
 812 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 813 {
 814         int dpms = DRM_MODE_DPMS_OFF;
 815         struct drm_connector *connector;
 816         struct drm_device *dev = crtc->dev;
 817
 818         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 819                 if (connector->encoder && connector->encoder->crtc == crtc)
 820                         if (connector->dpms < dpms)
 821                                 dpms = connector->dpms;
 822         return dpms;
 823 }
 824
 825 /**
 826  * drm_helper_connector_dpms
 827  * @connector affected connector
 828  * @mode DPMS mode
 829  *
 830  * Calls the low-level connector DPMS function, then
 831  * calls appropriate encoder and crtc DPMS functions as well
 832  */
 833 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 834 {
 835         struct drm_encoder *encoder = connector->encoder;
 836         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 837         int old_dpms;
 838
 839         if (mode == connector->dpms)
 840                 return;
 841
 842         old_dpms = connector->dpms;
 843         connector->dpms = mode;
 844
 845         /* from off to on, do crtc then encoder */
 846         if (mode < old_dpms) {
 847                 if (crtc) {
 848                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 849                         if (crtc_funcs->dpms)
 850                                 (*crtc_funcs->dpms) (crtc,
 851                                                      drm_helper_choose_crtc_dpms(crtc));
 852                 }
 853                 if (encoder) {
 854                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 855                         if (encoder_funcs->dpms)
 856                                 (*encoder_funcs->dpms) (encoder,
 857                                                         drm_helper_choose_encoder_dpms(encoder));
 858                 }
 859         }
 860
 861         /* from on to off, do encoder then crtc */
 862         if (mode > old_dpms) {
 863                 if (encoder) {
 864                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 865                         if (encoder_funcs->dpms)
 866                                 (*encoder_funcs->dpms) (encoder,
 867                                                         drm_helper_choose_encoder_dpms(encoder));
 868                 }
 869                 if (crtc) {
 870                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 871                         if (crtc_funcs->dpms)
 872                                 (*crtc_funcs->dpms) (crtc,
 873                                                      drm_helper_choose_crtc_dpms(crtc));
 874                 }
 875         }
 876
 877         return;
 878 }
 879 EXPORT_SYMBOL(drm_helper_connector_dpms);
 880
 881 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 882                                    struct drm_mode_fb_cmd2 *mode_cmd)
 883 {
 884         int i;
 885
 886         fb->width = mode_cmd->width;
 887         fb->height = mode_cmd->height;
 888         for (i = 0; i < 4; i++) {
 889                 fb->pitches[i] = mode_cmd->pitches[i];
 890                 fb->offsets[i] = mode_cmd->offsets[i];
 891         }
 892         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 893                                     &fb->bits_per_pixel);
 894         fb->pixel_format = mode_cmd->pixel_format;
 895
 896         return 0;
 897 }
 898 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 899
 900 int drm_helper_resume_force_mode(struct drm_device *dev)
 901 {
 902         struct drm_crtc *crtc;
 903         struct drm_encoder *encoder;
 904         struct drm_encoder_helper_funcs *encoder_funcs;
 905         struct drm_crtc_helper_funcs *crtc_funcs;
 906         int ret;
 907
 908         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 909
 910                 if (!crtc->enabled)
 911                         continue;
 912
 913                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 914                                                crtc->x, crtc->y, crtc->fb);
 915
 916                 if (ret == false)
 917                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 918
 919                 /* Turn off outputs that were already powered off */
 920                 if (drm_helper_choose_crtc_dpms(crtc)) {
 921                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 922
 923                                 if(encoder->crtc != crtc)
 924                                         continue;
 925
 926                                 encoder_funcs = encoder->helper_private;
 927                                 if (encoder_funcs->dpms)
 928                                         (*encoder_funcs->dpms) (encoder,
 929                                                                 drm_helper_choose_encoder_dpms(encoder));
 930                         }
 931
 932                         crtc_funcs = crtc->helper_private;
 933                         if (crtc_funcs->dpms)
 934                                 (*crtc_funcs->dpms) (crtc,
 935                                                      drm_helper_choose_crtc_dpms(crtc));
 936                 }
 937         }
 938         /* disable the unused connectors while restoring the modesetting */
 939         drm_helper_disable_unused_functions(dev);
 940         return 0;
 941 }
 942 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 943
 944 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 945 {
 946         /* send a uevent + call fbdev */
 947         drm_sysfs_hotplug_event(dev);
 948         if (dev->mode_config.funcs->output_poll_changed)
 949                 dev->mode_config.funcs->output_poll_changed(dev);
 950 }
 951 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
 952
 953 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 954 static void output_poll_execute(struct work_struct *work)
 955 {
 956         struct delayed_work *delayed_work = to_delayed_work(work);
 957         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 958         struct drm_connector *connector;
 959         enum drm_connector_status old_status;
 960         bool repoll = false, changed = false;
 961
 962         if (!drm_kms_helper_poll)
 963                 return;
 964
 965         mutex_lock(&dev->mode_config.mutex);
 966         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 967
 968                 /* Ignore forced connectors. */
 969                 if (connector->force)
 970                         continue;
 971
 972                 /* Ignore HPD capable connectors and connectors where we don't
 973                  * want any hotplug detection at all for polling. */
 974                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
 975                         continue;
 976
 977                 repoll = true;
 978
 979                 old_status = connector->status;
 980                 /* if we are connected and don't want to poll for disconnect
 981                    skip it */
 982                 if (old_status == connector_status_connected &&
 983                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
 984                         continue;
 985
 986                 connector->status = connector->funcs->detect(connector, false);
 987                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 988                               connector->base.id,
 989                               drm_get_connector_name(connector),
 990                               old_status, connector->status);
 991                 if (old_status != connector->status)
 992                         changed = true;
 993         }
 994
 995         mutex_unlock(&dev->mode_config.mutex);
 996
 997         if (changed)
 998                 drm_kms_helper_hotplug_event(dev);
 999
1000         if (repoll)
1001                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1002 }
1003
1004 void drm_kms_helper_poll_disable(struct drm_device *dev)
1005 {
1006         if (!dev->mode_config.poll_enabled)
1007                 return;
1008         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1009 }
1010 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1011
1012 void drm_kms_helper_poll_enable(struct drm_device *dev)
1013 {
1014         bool poll = false;
1015         struct drm_connector *connector;
1016
1017         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1018                 return;
1019
1020         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1021                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1022                                          DRM_CONNECTOR_POLL_DISCONNECT))
1023                         poll = true;
1024         }
1025
1026         if (poll)
1027                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1028 }
1029 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1030
1031 void drm_kms_helper_poll_init(struct drm_device *dev)
1032 {
1033         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1034         dev->mode_config.poll_enabled = true;
1035
1036         drm_kms_helper_poll_enable(dev);
1037 }
1038 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1039
1040 void drm_kms_helper_poll_fini(struct drm_device *dev)
1041 {
1042         drm_kms_helper_poll_disable(dev);
1043 }
1044 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1045
1046 void drm_helper_hpd_irq_event(struct drm_device *dev)
1047 {
1048         struct drm_connector *connector;
1049         enum drm_connector_status old_status;
1050         bool changed = false;
1051
1052         if (!dev->mode_config.poll_enabled)
1053                 return;
1054
1055         mutex_lock(&dev->mode_config.mutex);
1056         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1057
1058                 /* Only handle HPD capable connectors. */
1059                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1060                         continue;
1061
1062                 old_status = connector->status;
1063
1064                 connector->status = connector->funcs->detect(connector, false);
1065                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
1066                               connector->base.id,
1067                               drm_get_connector_name(connector),
1068                               old_status, connector->status);
1069                 if (old_status != connector->status)
1070                         changed = true;
1071         }
1072
1073         mutex_unlock(&dev->mode_config.mutex);
1074
1075         if (changed)
1076                 drm_kms_helper_hotplug_event(dev);
1077 }
1078 EXPORT_SYMBOL(drm_helper_hpd_irq_event);