drivers/gpu/drm/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <[email protected]>
   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 <[email protected]>
  28  *      Dave Airlie <[email protected]>
  29  *      Jesse Barnes <[email protected]>
  30  */
  31
  32 #include "drmP.h"
  33 #include "drm_crtc.h"
  34 #include "drm_crtc_helper.h"
  35 #include "drm_fb_helper.h"
  36
  37 static void drm_mode_validate_flag(struct drm_connector *connector,
  38                                    int flags)
  39 {
  40         struct drm_display_mode *mode, *t;
  41
  42         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  43                 return;
  44
  45         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  46                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  47                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  48                         mode->status = MODE_NO_INTERLACE;
  49                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  50                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  51                         mode->status = MODE_NO_DBLESCAN;
  52         }
  53
  54         return;
  55 }
  56
  57 /**
  58  * drm_helper_probe_single_connector_modes - get complete set of display modes
  59  * @dev: DRM device
  60  * @maxX: max width for modes
  61  * @maxY: max height for modes
  62  *
  63  * LOCKING:
  64  * Caller must hold mode config lock.
  65  *
  66  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  67  * modes on them.  Modes will first be added to the connector's probed_modes
  68  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  69  * put into the normal modes list.
  70  *
  71  * Intended to be used either at bootup time or when major configuration
  72  * changes have occurred.
  73  *
  74  * FIXME: take into account monitor limits
  75  *
  76  * RETURNS:
  77  * Number of modes found on @connector.
  78  */
  79 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  80                                             uint32_t maxX, uint32_t maxY)
  81 {
  82         struct drm_device *dev = connector->dev;
  83         struct drm_display_mode *mode, *t;
  84         struct drm_connector_helper_funcs *connector_funcs =
  85                 connector->helper_private;
  86         int count = 0;
  87         int mode_flags = 0;
  88
  89         DRM_DEBUG_KMS("%s\n", drm_get_connector_name(connector));
  90         /* set all modes to the unverified state */
  91         list_for_each_entry_safe(mode, t, &connector->modes, head)
  92                 mode->status = MODE_UNVERIFIED;
  93
  94         if (connector->force) {
  95                 if (connector->force == DRM_FORCE_ON)
  96                         connector->status = connector_status_connected;
  97                 else
  98                         connector->status = connector_status_disconnected;
  99                 if (connector->funcs->force)
 100                         connector->funcs->force(connector);
 101         } else
 102                 connector->status = connector->funcs->detect(connector);
 103
 104         if (connector->status == connector_status_disconnected) {
 105                 DRM_DEBUG_KMS("%s is disconnected\n",
 106                           drm_get_connector_name(connector));
 107                 drm_mode_connector_update_edid_property(connector, NULL);
 108                 goto prune;
 109         }
 110
 111         count = (*connector_funcs->get_modes)(connector);
 112         if (!count) {
 113                 count = drm_add_modes_noedid(connector, 1024, 768);
 114                 if (!count)
 115                         return 0;
 116         }
 117
 118         drm_mode_connector_list_update(connector);
 119
 120         if (maxX && maxY)
 121                 drm_mode_validate_size(dev, &connector->modes, maxX,
 122                                        maxY, 0);
 123
 124         if (connector->interlace_allowed)
 125                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 126         if (connector->doublescan_allowed)
 127                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 128         drm_mode_validate_flag(connector, mode_flags);
 129
 130         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 131                 if (mode->status == MODE_OK)
 132                         mode->status = connector_funcs->mode_valid(connector,
 133                                                                    mode);
 134         }
 135
 136 prune:
 137         drm_mode_prune_invalid(dev, &connector->modes, true);
 138
 139         if (list_empty(&connector->modes))
 140                 return 0;
 141
 142         drm_mode_sort(&connector->modes);
 143
 144         DRM_DEBUG_KMS("Probed modes for %s\n",
 145                                 drm_get_connector_name(connector));
 146         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 147                 mode->vrefresh = drm_mode_vrefresh(mode);
 148
 149                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 150                 drm_mode_debug_printmodeline(mode);
 151         }
 152
 153         return count;
 154 }
 155 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 156
 157 /**
 158  * drm_helper_encoder_in_use - check if a given encoder is in use
 159  * @encoder: encoder to check
 160  *
 161  * LOCKING:
 162  * Caller must hold mode config lock.
 163  *
 164  * Walk @encoders's DRM device's mode_config and see if it's in use.
 165  *
 166  * RETURNS:
 167  * True if @encoder is part of the mode_config, false otherwise.
 168  */
 169 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 170 {
 171         struct drm_connector *connector;
 172         struct drm_device *dev = encoder->dev;
 173         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 174                 if (connector->encoder == encoder)
 175                         return true;
 176         return false;
 177 }
 178 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 179
 180 /**
 181  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 182  * @crtc: CRTC to check
 183  *
 184  * LOCKING:
 185  * Caller must hold mode config lock.
 186  *
 187  * Walk @crtc's DRM device's mode_config and see if it's in use.
 188  *
 189  * RETURNS:
 190  * True if @crtc is part of the mode_config, false otherwise.
 191  */
 192 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 193 {
 194         struct drm_encoder *encoder;
 195         struct drm_device *dev = crtc->dev;
 196         /* FIXME: Locking around list access? */
 197         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 198                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 199                         return true;
 200         return false;
 201 }
 202 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 203
 204 /**
 205  * drm_helper_disable_unused_functions - disable unused objects
 206  * @dev: DRM device
 207  *
 208  * LOCKING:
 209  * Caller must hold mode config lock.
 210  *
 211  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 212  * by calling its dpms function, which should power it off.
 213  */
 214 void drm_helper_disable_unused_functions(struct drm_device *dev)
 215 {
 216         struct drm_encoder *encoder;
 217         struct drm_connector *connector;
 218         struct drm_encoder_helper_funcs *encoder_funcs;
 219         struct drm_crtc *crtc;
 220
 221         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 222                 if (!connector->encoder)
 223                         continue;
 224                 if (connector->status == connector_status_disconnected)
 225                         connector->encoder = NULL;
 226         }
 227
 228         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 229                 encoder_funcs = encoder->helper_private;
 230                 if (!drm_helper_encoder_in_use(encoder)) {
 231                         if (encoder_funcs->disable)
 232                                 (*encoder_funcs->disable)(encoder);
 233                         else
 234                                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 235                         /* disconnector encoder from any connector */
 236                         encoder->crtc = NULL;
 237                 }
 238         }
 239
 240         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 241                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 242                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 243                 if (!crtc->enabled) {
 244                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 245                         crtc->fb = NULL;
 246                 }
 247         }
 248 }
 249 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 250
 251 /**
 252  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 253  * @encoder: encoder to test
 254  * @crtc: crtc to test
 255  *
 256  * Return false if @encoder can't be driven by @crtc, true otherwise.
 257  */
 258 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 259                                 struct drm_crtc *crtc)
 260 {
 261         struct drm_device *dev;
 262         struct drm_crtc *tmp;
 263         int crtc_mask = 1;
 264
 265         WARN(!crtc, "checking null crtc?");
 266
 267         dev = crtc->dev;
 268
 269         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 270                 if (tmp == crtc)
 271                         break;
 272                 crtc_mask <<= 1;
 273         }
 274
 275         if (encoder->possible_crtcs & crtc_mask)
 276                 return true;
 277         return false;
 278 }
 279
 280 /*
 281  * Check the CRTC we're going to map each output to vs. its current
 282  * CRTC.  If they don't match, we have to disable the output and the CRTC
 283  * since the driver will have to re-route things.
 284  */
 285 static void
 286 drm_crtc_prepare_encoders(struct drm_device *dev)
 287 {
 288         struct drm_encoder_helper_funcs *encoder_funcs;
 289         struct drm_encoder *encoder;
 290
 291         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 292                 encoder_funcs = encoder->helper_private;
 293                 /* Disable unused encoders */
 294                 if (encoder->crtc == NULL)
 295                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 296                 /* Disable encoders whose CRTC is about to change */
 297                 if (encoder_funcs->get_crtc &&
 298                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 299                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 300         }
 301 }
 302
 303 /**
 304  * drm_crtc_set_mode - set a mode
 305  * @crtc: CRTC to program
 306  * @mode: mode to use
 307  * @x: width of mode
 308  * @y: height of mode
 309  *
 310  * LOCKING:
 311  * Caller must hold mode config lock.
 312  *
 313  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 314  * to fixup or reject the mode prior to trying to set it.
 315  *
 316  * RETURNS:
 317  * True if the mode was set successfully, or false otherwise.
 318  */
 319 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 320                               struct drm_display_mode *mode,
 321                               int x, int y,
 322                               struct drm_framebuffer *old_fb)
 323 {
 324         struct drm_device *dev = crtc->dev;
 325         struct drm_display_mode *adjusted_mode, saved_mode;
 326         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 327         struct drm_encoder_helper_funcs *encoder_funcs;
 328         int saved_x, saved_y;
 329         struct drm_encoder *encoder;
 330         bool ret = true;
 331
 332         adjusted_mode = drm_mode_duplicate(dev, mode);
 333
 334         crtc->enabled = drm_helper_crtc_in_use(crtc);
 335
 336         if (!crtc->enabled)
 337                 return true;
 338
 339         saved_mode = crtc->mode;
 340         saved_x = crtc->x;
 341         saved_y = crtc->y;
 342
 343         /* Update crtc values up front so the driver can rely on them for mode
 344          * setting.
 345          */
 346         crtc->mode = *mode;
 347         crtc->x = x;
 348         crtc->y = y;
 349
 350         /* Pass our mode to the connectors and the CRTC to give them a chance to
 351          * adjust it according to limitations or connector properties, and also
 352          * a chance to reject the mode entirely.
 353          */
 354         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 355
 356                 if (encoder->crtc != crtc)
 357                         continue;
 358                 encoder_funcs = encoder->helper_private;
 359                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 360                                                       adjusted_mode))) {
 361                         goto done;
 362                 }
 363         }
 364
 365         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 366                 goto done;
 367         }
 368
 369         /* Prepare the encoders and CRTCs before setting the mode. */
 370         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 371
 372                 if (encoder->crtc != crtc)
 373                         continue;
 374                 encoder_funcs = encoder->helper_private;
 375                 /* Disable the encoders as the first thing we do. */
 376                 encoder_funcs->prepare(encoder);
 377         }
 378
 379         drm_crtc_prepare_encoders(dev);
 380
 381         crtc_funcs->prepare(crtc);
 382
 383         /* Set up the DPLL and any encoders state that needs to adjust or depend
 384          * on the DPLL.
 385          */
 386         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 387         if (!ret)
 388             goto done;
 389
 390         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 391
 392                 if (encoder->crtc != crtc)
 393                         continue;
 394
 395                 DRM_DEBUG("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 396                          mode->name, mode->base.id);
 397                 encoder_funcs = encoder->helper_private;
 398                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 399         }
 400
 401         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 402         crtc_funcs->commit(crtc);
 403
 404         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 405
 406                 if (encoder->crtc != crtc)
 407                         continue;
 408
 409                 encoder_funcs = encoder->helper_private;
 410                 encoder_funcs->commit(encoder);
 411
 412         }
 413
 414         /* XXX free adjustedmode */
 415         drm_mode_destroy(dev, adjusted_mode);
 416         /* FIXME: add subpixel order */
 417 done:
 418         if (!ret) {
 419                 crtc->mode = saved_mode;
 420                 crtc->x = saved_x;
 421                 crtc->y = saved_y;
 422         }
 423
 424         return ret;
 425 }
 426 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 427
 428
 429 /**
 430  * drm_crtc_helper_set_config - set a new config from userspace
 431  * @crtc: CRTC to setup
 432  * @crtc_info: user provided configuration
 433  * @new_mode: new mode to set
 434  * @connector_set: set of connectors for the new config
 435  * @fb: new framebuffer
 436  *
 437  * LOCKING:
 438  * Caller must hold mode config lock.
 439  *
 440  * Setup a new configuration, provided by the user in @crtc_info, and enable
 441  * it.
 442  *
 443  * RETURNS:
 444  * Zero. (FIXME)
 445  */
 446 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 447 {
 448         struct drm_device *dev;
 449         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 450         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 451         struct drm_framebuffer *old_fb = NULL;
 452         bool mode_changed = false; /* if true do a full mode set */
 453         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 454         struct drm_connector *save_connectors, *connector;
 455         int count = 0, ro, fail = 0;
 456         struct drm_crtc_helper_funcs *crtc_funcs;
 457         int ret = 0;
 458
 459         DRM_DEBUG_KMS("\n");
 460
 461         if (!set)
 462                 return -EINVAL;
 463
 464         if (!set->crtc)
 465                 return -EINVAL;
 466
 467         if (!set->crtc->helper_private)
 468                 return -EINVAL;
 469
 470         crtc_funcs = set->crtc->helper_private;
 471
 472         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
 473                         " %d (x, y) (%i, %i)\n",
 474                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 475                   (int)set->num_connectors, set->x, set->y);
 476
 477         dev = set->crtc->dev;
 478
 479         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 480          * connector data. */
 481         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 482                              sizeof(struct drm_crtc), GFP_KERNEL);
 483         if (!save_crtcs)
 484                 return -ENOMEM;
 485
 486         save_encoders = kzalloc(dev->mode_config.num_encoder *
 487                                 sizeof(struct drm_encoder), GFP_KERNEL);
 488         if (!save_encoders) {
 489                 kfree(save_crtcs);
 490                 return -ENOMEM;
 491         }
 492
 493         save_connectors = kzalloc(dev->mode_config.num_connector *
 494                                 sizeof(struct drm_connector), GFP_KERNEL);
 495         if (!save_connectors) {
 496                 kfree(save_crtcs);
 497                 kfree(save_encoders);
 498                 return -ENOMEM;
 499         }
 500
 501         /* Copy data. Note that driver private data is not affected.
 502          * Should anything bad happen only the expected state is
 503          * restored, not the drivers personal bookkeeping.
 504          */
 505         count = 0;
 506         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 507                 save_crtcs[count++] = *crtc;
 508         }
 509
 510         count = 0;
 511         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 512                 save_encoders[count++] = *encoder;
 513         }
 514
 515         count = 0;
 516         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 517                 save_connectors[count++] = *connector;
 518         }
 519
 520         /* We should be able to check here if the fb has the same properties
 521          * and then just flip_or_move it */
 522         if (set->crtc->fb != set->fb) {
 523                 /* If we have no fb then treat it as a full mode set */
 524                 if (set->crtc->fb == NULL) {
 525                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 526                         mode_changed = true;
 527                 } else if (set->fb == NULL) {
 528                         mode_changed = true;
 529                 } else
 530                         fb_changed = true;
 531         }
 532
 533         if (set->x != set->crtc->x || set->y != set->crtc->y)
 534                 fb_changed = true;
 535
 536         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 537                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 538                 drm_mode_debug_printmodeline(&set->crtc->mode);
 539                 drm_mode_debug_printmodeline(set->mode);
 540                 mode_changed = true;
 541         }
 542
 543         /* a) traverse passed in connector list and get encoders for them */
 544         count = 0;
 545         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 546                 struct drm_connector_helper_funcs *connector_funcs =
 547                         connector->helper_private;
 548                 new_encoder = connector->encoder;
 549                 for (ro = 0; ro < set->num_connectors; ro++) {
 550                         if (set->connectors[ro] == connector) {
 551                                 new_encoder = connector_funcs->best_encoder(connector);
 552                                 /* if we can't get an encoder for a connector
 553                                    we are setting now - then fail */
 554                                 if (new_encoder == NULL)
 555                                         /* don't break so fail path works correct */
 556                                         fail = 1;
 557                                 break;
 558                         }
 559                 }
 560
 561                 if (new_encoder != connector->encoder) {
 562                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 563                         mode_changed = true;
 564                         /* If the encoder is reused for another connector, then
 565                          * the appropriate crtc will be set later.
 566                          */
 567                         if (connector->encoder)
 568                                 connector->encoder->crtc = NULL;
 569                         connector->encoder = new_encoder;
 570                 }
 571         }
 572
 573         if (fail) {
 574                 ret = -EINVAL;
 575                 goto fail;
 576         }
 577
 578         count = 0;
 579         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 580                 if (!connector->encoder)
 581                         continue;
 582
 583                 if (connector->encoder->crtc == set->crtc)
 584                         new_crtc = NULL;
 585                 else
 586                         new_crtc = connector->encoder->crtc;
 587
 588                 for (ro = 0; ro < set->num_connectors; ro++) {
 589                         if (set->connectors[ro] == connector)
 590                                 new_crtc = set->crtc;
 591                 }
 592
 593                 /* Make sure the new CRTC will work with the encoder */
 594                 if (new_crtc &&
 595                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 596                         ret = -EINVAL;
 597                         goto fail;
 598                 }
 599                 if (new_crtc != connector->encoder->crtc) {
 600                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 601                         mode_changed = true;
 602                         connector->encoder->crtc = new_crtc;
 603                 }
 604                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
 605                           connector->base.id, new_crtc);
 606         }
 607
 608         /* mode_set_base is not a required function */
 609         if (fb_changed && !crtc_funcs->mode_set_base)
 610                 mode_changed = true;
 611
 612         if (mode_changed) {
 613                 old_fb = set->crtc->fb;
 614                 set->crtc->fb = set->fb;
 615                 set->crtc->enabled = (set->mode != NULL);
 616                 if (set->mode != NULL) {
 617                         DRM_DEBUG_KMS("attempting to set mode from"
 618                                         " userspace\n");
 619                         drm_mode_debug_printmodeline(set->mode);
 620                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 621                                                       set->x, set->y,
 622                                                       old_fb)) {
 623                                 DRM_ERROR("failed to set mode on crtc %p\n",
 624                                           set->crtc);
 625                                 ret = -EINVAL;
 626                                 goto fail;
 627                         }
 628                 }
 629                 drm_helper_disable_unused_functions(dev);
 630         } else if (fb_changed) {
 631                 set->crtc->x = set->x;
 632                 set->crtc->y = set->y;
 633
 634                 old_fb = set->crtc->fb;
 635                 if (set->crtc->fb != set->fb)
 636                         set->crtc->fb = set->fb;
 637                 ret = crtc_funcs->mode_set_base(set->crtc,
 638                                                 set->x, set->y, old_fb);
 639                 if (ret != 0)
 640                         goto fail;
 641         }
 642
 643         kfree(save_connectors);
 644         kfree(save_encoders);
 645         kfree(save_crtcs);
 646         return 0;
 647
 648 fail:
 649         /* Restore all previous data. */
 650         count = 0;
 651         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 652                 *crtc = save_crtcs[count++];
 653         }
 654
 655         count = 0;
 656         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 657                 *encoder = save_encoders[count++];
 658         }
 659
 660         count = 0;
 661         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 662                 *connector = save_connectors[count++];
 663         }
 664
 665         kfree(save_connectors);
 666         kfree(save_encoders);
 667         kfree(save_crtcs);
 668         return ret;
 669 }
 670 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 671
 672 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 673 {
 674         int dpms = DRM_MODE_DPMS_OFF;
 675         struct drm_connector *connector;
 676         struct drm_device *dev = encoder->dev;
 677
 678         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 679                 if (connector->encoder == encoder)
 680                         if (connector->dpms < dpms)
 681                                 dpms = connector->dpms;
 682         return dpms;
 683 }
 684
 685 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 686 {
 687         int dpms = DRM_MODE_DPMS_OFF;
 688         struct drm_connector *connector;
 689         struct drm_device *dev = crtc->dev;
 690
 691         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 692                 if (connector->encoder && connector->encoder->crtc == crtc)
 693                         if (connector->dpms < dpms)
 694                                 dpms = connector->dpms;
 695         return dpms;
 696 }
 697
 698 /**
 699  * drm_helper_connector_dpms
 700  * @connector affected connector
 701  * @mode DPMS mode
 702  *
 703  * Calls the low-level connector DPMS function, then
 704  * calls appropriate encoder and crtc DPMS functions as well
 705  */
 706 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 707 {
 708         struct drm_encoder *encoder = connector->encoder;
 709         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 710         int old_dpms;
 711
 712         if (mode == connector->dpms)
 713                 return;
 714
 715         old_dpms = connector->dpms;
 716         connector->dpms = mode;
 717
 718         /* from off to on, do crtc then encoder */
 719         if (mode < old_dpms) {
 720                 if (crtc) {
 721                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 722                         if (crtc_funcs->dpms)
 723                                 (*crtc_funcs->dpms) (crtc,
 724                                                      drm_helper_choose_crtc_dpms(crtc));
 725                 }
 726                 if (encoder) {
 727                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 728                         if (encoder_funcs->dpms)
 729                                 (*encoder_funcs->dpms) (encoder,
 730                                                         drm_helper_choose_encoder_dpms(encoder));
 731                 }
 732         }
 733
 734         /* from on to off, do encoder then crtc */
 735         if (mode > old_dpms) {
 736                 if (encoder) {
 737                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 738                         if (encoder_funcs->dpms)
 739                                 (*encoder_funcs->dpms) (encoder,
 740                                                         drm_helper_choose_encoder_dpms(encoder));
 741                 }
 742                 if (crtc) {
 743                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 744                         if (crtc_funcs->dpms)
 745                                 (*crtc_funcs->dpms) (crtc,
 746                                                      drm_helper_choose_crtc_dpms(crtc));
 747                 }
 748         }
 749
 750         return;
 751 }
 752 EXPORT_SYMBOL(drm_helper_connector_dpms);
 753
 754 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 755                                    struct drm_mode_fb_cmd *mode_cmd)
 756 {
 757         fb->width = mode_cmd->width;
 758         fb->height = mode_cmd->height;
 759         fb->pitch = mode_cmd->pitch;
 760         fb->bits_per_pixel = mode_cmd->bpp;
 761         fb->depth = mode_cmd->depth;
 762
 763         return 0;
 764 }
 765 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 766
 767 int drm_helper_resume_force_mode(struct drm_device *dev)
 768 {
 769         struct drm_crtc *crtc;
 770         struct drm_encoder *encoder;
 771         struct drm_encoder_helper_funcs *encoder_funcs;
 772         struct drm_crtc_helper_funcs *crtc_funcs;
 773         int ret;
 774
 775         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 776
 777                 if (!crtc->enabled)
 778                         continue;
 779
 780                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 781                                                crtc->x, crtc->y, crtc->fb);
 782
 783                 if (ret == false)
 784                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 785
 786                 /* Turn off outputs that were already powered off */
 787                 if (drm_helper_choose_crtc_dpms(crtc)) {
 788                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 789
 790                                 if(encoder->crtc != crtc)
 791                                         continue;
 792
 793                                 encoder_funcs = encoder->helper_private;
 794                                 if (encoder_funcs->dpms)
 795                                         (*encoder_funcs->dpms) (encoder,
 796                                                                 drm_helper_choose_encoder_dpms(encoder));
 797
 798                                 crtc_funcs = crtc->helper_private;
 799                                 if (crtc_funcs->dpms)
 800                                         (*crtc_funcs->dpms) (crtc,
 801                                                              drm_helper_choose_crtc_dpms(crtc));
 802                         }
 803                 }
 804         }
 805         /* disable the unused connectors while restoring the modesetting */
 806         drm_helper_disable_unused_functions(dev);
 807         return 0;
 808 }
 809 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 810
 811 static struct slow_work_ops output_poll_ops;
 812
 813 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 814 static void output_poll_execute(struct slow_work *work)
 815 {
 816         struct delayed_slow_work *delayed_work = container_of(work, struct delayed_slow_work, work);
 817         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_slow_work);
 818         struct drm_connector *connector;
 819         enum drm_connector_status old_status, status;
 820         bool repoll = false, changed = false;
 821         int ret;
 822
 823         mutex_lock(&dev->mode_config.mutex);
 824         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 825
 826                 /* if this is HPD or polled don't check it -
 827                    TV out for instance */
 828                 if (!connector->polled)
 829                         continue;
 830
 831                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
 832                         repoll = true;
 833
 834                 old_status = connector->status;
 835                 /* if we are connected and don't want to poll for disconnect
 836                    skip it */
 837                 if (old_status == connector_status_connected &&
 838                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 839                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 840                         continue;
 841
 842                 status = connector->funcs->detect(connector);
 843                 if (old_status != status)
 844                         changed = true;
 845         }
 846
 847         mutex_unlock(&dev->mode_config.mutex);
 848
 849         if (changed) {
 850                 /* send a uevent + call fbdev */
 851                 drm_sysfs_hotplug_event(dev);
 852                 if (dev->mode_config.funcs->output_poll_changed)
 853                         dev->mode_config.funcs->output_poll_changed(dev);
 854         }
 855
 856         if (repoll) {
 857                 ret = delayed_slow_work_enqueue(delayed_work, DRM_OUTPUT_POLL_PERIOD);
 858                 if (ret)
 859                         DRM_ERROR("delayed enqueue failed %d\n", ret);
 860         }
 861 }
 862
 863 void drm_kms_helper_poll_disable(struct drm_device *dev)
 864 {
 865         if (!dev->mode_config.poll_enabled)
 866                 return;
 867         delayed_slow_work_cancel(&dev->mode_config.output_poll_slow_work);
 868 }
 869 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 870
 871 void drm_kms_helper_poll_enable(struct drm_device *dev)
 872 {
 873         bool poll = false;
 874         struct drm_connector *connector;
 875         int ret;
 876
 877         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 878                 if (connector->polled)
 879                         poll = true;
 880         }
 881
 882         if (poll) {
 883                 ret = delayed_slow_work_enqueue(&dev->mode_config.output_poll_slow_work, DRM_OUTPUT_POLL_PERIOD);
 884                 if (ret)
 885                         DRM_ERROR("delayed enqueue failed %d\n", ret);
 886         }
 887 }
 888 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
 889
 890 void drm_kms_helper_poll_init(struct drm_device *dev)
 891 {
 892         slow_work_register_user(THIS_MODULE);
 893         delayed_slow_work_init(&dev->mode_config.output_poll_slow_work,
 894                                &output_poll_ops);
 895         dev->mode_config.poll_enabled = true;
 896
 897         drm_kms_helper_poll_enable(dev);
 898 }
 899 EXPORT_SYMBOL(drm_kms_helper_poll_init);
 900
 901 void drm_kms_helper_poll_fini(struct drm_device *dev)
 902 {
 903         drm_kms_helper_poll_disable(dev);
 904         slow_work_unregister_user(THIS_MODULE);
 905 }
 906 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
 907
 908 void drm_helper_hpd_irq_event(struct drm_device *dev)
 909 {
 910         if (!dev->mode_config.poll_enabled)
 911                 return;
 912         delayed_slow_work_cancel(&dev->mode_config.output_poll_slow_work);
 913         /* schedule a slow work asap */
 914         delayed_slow_work_enqueue(&dev->mode_config.output_poll_slow_work, 0);
 915 }
 916 EXPORT_SYMBOL(drm_helper_hpd_irq_event);
 917
 918 static struct slow_work_ops output_poll_ops = {
 919         .execute = output_poll_execute,
 920 };