linux-core/drm_crtc_helper.c

   1 /* (c) 2006-2007 Intel Corporation
   2  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   3  *
   4  * DRM core CRTC related functions
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that copyright
   9  * notice and this permission notice appear in supporting documentation, and
  10  * that the name of the copyright holders not be used in advertising or
  11  * publicity pertaining to distribution of the software without specific,
  12  * written prior permission.  The copyright holders make no representations
  13  * about the suitability of this software for any purpose.  It is provided "as
  14  * is" without express or implied warranty.
  15  *
  16  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  *
  24  * Authors:
  25  *      Keith Packard
  26  *      Eric Anholt <eric@anholt.net>
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30
  31 #include "drmP.h"
  32 #include "drm_crtc.h"
  33 #include "drm_crtc_helper.h"
  34
  35 /*
  36  * Detailed mode info for a standard 640x480@60Hz monitor
  37  */
  38 static struct drm_display_mode std_mode[] = {
  39         { DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 25200, 640, 656,
  40                    752, 800, 0, 480, 490, 492, 525, 0,
  41                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */
  42 };
  43
  44 /**
  45  * drm_helper_probe_connector_modes - get complete set of display modes
  46  * @dev: DRM device
  47  * @maxX: max width for modes
  48  * @maxY: max height for modes
  49  *
  50  * LOCKING:
  51  * Caller must hold mode config lock.
  52  *
  53  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  54  * modes on them.  Modes will first be added to the connector's probed_modes
  55  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  56  * put into the normal modes list.
  57  *
  58  * Intended to be used either at bootup time or when major configuration
  59  * changes have occurred.
  60  *
  61  * FIXME: take into account monitor limits
  62  */
  63 void drm_helper_probe_single_connector_modes(struct drm_connector *connector, uint32_t maxX, uint32_t maxY)
  64 {
  65         struct drm_device *dev = connector->dev;
  66         struct drm_display_mode *mode, *t;
  67         struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
  68         int ret;
  69
  70         DRM_DEBUG("%s\n", drm_get_connector_name(connector));
  71         /* set all modes to the unverified state */
  72         list_for_each_entry_safe(mode, t, &connector->modes, head)
  73                 mode->status = MODE_UNVERIFIED;
  74
  75         connector->status = (*connector->funcs->detect)(connector);
  76
  77         if (connector->status == connector_status_disconnected) {
  78                 DRM_DEBUG("%s is disconnected\n", drm_get_connector_name(connector));
  79                 /* TODO set EDID to NULL */
  80                 return;
  81         }
  82
  83         ret = (*connector_funcs->get_modes)(connector);
  84
  85         if (ret) {
  86                 drm_mode_connector_list_update(connector);
  87         }
  88
  89         if (maxX && maxY)
  90                 drm_mode_validate_size(dev, &connector->modes, maxX,
  91                                        maxY, 0);
  92         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  93                 if (mode->status == MODE_OK)
  94                         mode->status = (*connector_funcs->mode_valid)(connector,mode);
  95         }
  96
  97
  98         drm_mode_prune_invalid(dev, &connector->modes, true);
  99
 100         if (list_empty(&connector->modes)) {
 101                 struct drm_display_mode *stdmode;
 102
 103                 DRM_DEBUG("No valid modes on %s\n", drm_get_connector_name(connector));
 104
 105                 /* Should we do this here ???
 106                  * When no valid EDID modes are available we end up
 107                  * here and bailed in the past, now we add a standard
 108                  * 640x480@60Hz mode and carry on.
 109                  */
 110                 stdmode = drm_mode_duplicate(dev, &std_mode[0]);
 111                 drm_mode_probed_add(connector, stdmode);
 112                 drm_mode_list_concat(&connector->probed_modes,
 113                                      &connector->modes);
 114
 115                 DRM_DEBUG("Adding standard 640x480 @ 60Hz to %s\n",
 116                           drm_get_connector_name(connector));
 117         }
 118
 119         drm_mode_sort(&connector->modes);
 120
 121         DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
 122         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 123                 mode->vrefresh = drm_mode_vrefresh(mode);
 124
 125                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 126                 drm_mode_debug_printmodeline(mode);
 127         }
 128 }
 129 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 130
 131 void drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX, uint32_t maxY)
 132 {
 133         struct drm_connector *connector;
 134
 135         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 136                 drm_helper_probe_single_connector_modes(connector, maxX, maxY);
 137         }
 138 }
 139 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
 140
 141
 142 /**
 143  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 144  * @crtc: CRTC to check
 145  *
 146  * LOCKING:
 147  * Caller must hold mode config lock.
 148  *
 149  * Walk @crtc's DRM device's mode_config and see if it's in use.
 150  *
 151  * RETURNS:
 152  * True if @crtc is part of the mode_config, false otherwise.
 153  */
 154 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 155 {
 156         struct drm_encoder *encoder;
 157         struct drm_device *dev = crtc->dev;
 158         /* FIXME: Locking around list access? */
 159         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 160                 if (encoder->crtc == crtc)
 161                         return true;
 162         return false;
 163 }
 164 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 165
 166 /**
 167  * drm_disable_unused_functions - disable unused objects
 168  * @dev: DRM device
 169  *
 170  * LOCKING:
 171  * Caller must hold mode config lock.
 172  *
 173  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 174  * by calling its dpms function, which should power it off.
 175  */
 176 void drm_helper_disable_unused_functions(struct drm_device *dev)
 177 {
 178         struct drm_encoder *encoder;
 179         struct drm_encoder_helper_funcs *encoder_funcs;
 180         struct drm_crtc *crtc;
 181
 182         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 183                 encoder_funcs = encoder->helper_private;
 184                 if (!encoder->crtc)
 185                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 186         }
 187
 188         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 189                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 190                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 191                 if (!crtc->enabled) {
 192                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 193                         crtc->fb = NULL;
 194                 }
 195         }
 196 }
 197 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 198
 199 /**
 200  * drm_pick_crtcs - pick crtcs for connector devices
 201  * @dev: DRM device
 202  *
 203  * LOCKING:
 204  * Caller must hold mode config lock.
 205  */
 206 void drm_pick_crtcs (struct drm_device *dev)
 207 {
 208         int c, o, assigned;
 209         struct drm_connector *connector, *connector_equal;
 210         struct drm_encoder *encoder, *encoder_equal;
 211         struct drm_crtc   *crtc;
 212         struct drm_display_mode *des_mode = NULL, *modes, *modes_equal;
 213         struct drm_connector_helper_funcs *connector_funcs;
 214         int found;
 215
 216         DRM_DEBUG("\n");
 217         /* clean out all the encoder/crtc combos */
 218         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 219                 encoder->crtc = NULL;
 220         }
 221
 222         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 223                 connector_funcs = connector->helper_private;
 224                 connector->encoder = NULL;
 225
 226                 /* Don't hook up connectors that are disconnected ??
 227                  *
 228                  * This is debateable. Do we want fixed /dev/fbX or
 229                  * dynamic on hotplug (need mode code for that though) ?
 230                  *
 231                  * If we don't hook up connectors now, then we only create
 232                  * /dev/fbX for the connector that's enabled, that's good as
 233                  * the users console will be on that connector.
 234                  *
 235                  * If we do hook up connectors that are disconnected now, then
 236                  * the user may end up having to muck about with the fbcon
 237                  * map flags to assign his console to the enabled connector. Ugh.
 238                  */
 239                 if (connector->status != connector_status_connected)
 240                         continue;
 241
 242                 if (list_empty(&connector->modes))
 243                         continue;
 244
 245                 des_mode = NULL;
 246                 found = 0;
 247                 list_for_each_entry(des_mode, &connector->modes, head) {
 248                         if (des_mode->type & DRM_MODE_TYPE_PREFERRED) {
 249                                 found = 1;
 250                                 break;
 251                         }
 252                 }
 253
 254                 /* No preferred mode, let's just select the first available */
 255                 if (!found) {
 256                         des_mode = NULL;
 257                         list_for_each_entry(des_mode, &connector->modes, head) {
 258                                 break;
 259                         }
 260                 }
 261
 262                 encoder = connector_funcs->best_encoder(connector);
 263                 if (!encoder)
 264                         continue;
 265
 266                 connector->encoder = encoder;
 267
 268                 c = -1;
 269                 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 270                         assigned = 0;
 271
 272                         c++;
 273                         if ((encoder->possible_crtcs & (1 << c)) == 0)
 274                                 continue;
 275
 276                         list_for_each_entry(encoder_equal, &dev->mode_config.encoder_list, head) {
 277                                 if (encoder->base.id == encoder_equal->base.id)
 278                                         continue;
 279
 280                                 /* Find out if crtc has been assigned before */
 281                                 if (encoder_equal->crtc == crtc)
 282                                         assigned = 1;
 283                         }
 284
 285 #if 1 /* continue for now */
 286                         if (assigned)
 287                                 continue;
 288 #endif
 289
 290                         o = -1;
 291                         list_for_each_entry(connector_equal, &dev->mode_config.connector_list, head) {
 292                                 o++;
 293                                 if (connector->base.id == connector_equal->base.id)
 294                                         continue;
 295
 296                                 encoder_equal = connector_equal->encoder;
 297
 298                                 if (!encoder_equal)
 299                                         continue;
 300
 301                                 list_for_each_entry(modes, &connector->modes, head) {
 302                                         list_for_each_entry(modes_equal, &connector_equal->modes, head) {
 303                                                 if (drm_mode_equal (modes, modes_equal)) {
 304                                                         if ((encoder->possible_clones & encoder_equal->possible_clones) && (connector_equal->encoder->crtc == crtc)) {
 305                                                                 printk("Cloning %s (0x%x) to %s (0x%x)\n",drm_get_connector_name(connector),encoder->possible_clones,drm_get_connector_name(connector_equal),encoder_equal->possible_clones);
 306                                                                 des_mode = modes;
 307                                                                 assigned = 0;
 308                                                                 goto clone;
 309                                                         }
 310                                                 }
 311                                         }
 312                                 }
 313                         }
 314
 315 clone:
 316                         /* crtc has been assigned skip it */
 317                         if (assigned)
 318                                 continue;
 319
 320                         /* Found a CRTC to attach to, do it ! */
 321                         encoder->crtc = crtc;
 322                         encoder->crtc->desired_mode = des_mode;
 323                         connector->initial_x = 0;
 324                         connector->initial_y = 0;
 325                         DRM_DEBUG("Desired mode for CRTC %d is 0x%x:%s\n",c,des_mode->base.id, des_mode->name);
 326                         break;
 327                 }
 328         }
 329 }
 330 EXPORT_SYMBOL(drm_pick_crtcs);
 331
 332 /**
 333  * drm_crtc_set_mode - set a mode
 334  * @crtc: CRTC to program
 335  * @mode: mode to use
 336  * @x: width of mode
 337  * @y: height of mode
 338  *
 339  * LOCKING:
 340  * Caller must hold mode config lock.
 341  *
 342  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 343  * to fixup or reject the mode prior to trying to set it.
 344  *
 345  * RETURNS:
 346  * True if the mode was set successfully, or false otherwise.
 347  */
 348 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, struct drm_display_mode *mode,
 349                               int x, int y)
 350 {
 351         struct drm_device *dev = crtc->dev;
 352         struct drm_display_mode *adjusted_mode, saved_mode;
 353         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 354         struct drm_encoder_helper_funcs *encoder_funcs;
 355         int saved_x, saved_y;
 356         struct drm_encoder *encoder;
 357         bool ret = true;
 358
 359         adjusted_mode = drm_mode_duplicate(dev, mode);
 360
 361         crtc->enabled = drm_helper_crtc_in_use(crtc);
 362
 363         if (!crtc->enabled)
 364                 return true;
 365
 366         saved_mode = crtc->mode;
 367         saved_x = crtc->x;
 368         saved_y = crtc->y;
 369
 370         /* Update crtc values up front so the driver can rely on them for mode
 371          * setting.
 372          */
 373         crtc->mode = *mode;
 374         crtc->x = x;
 375         crtc->y = y;
 376
 377         if (drm_mode_equal(&saved_mode, &crtc->mode)) {
 378                 if (saved_x != crtc->x || saved_y != crtc->y) {
 379                         crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y);
 380                         goto done;
 381                 }
 382         }
 383
 384         /* Pass our mode to the connectors and the CRTC to give them a chance to
 385          * adjust it according to limitations or connector properties, and also
 386          * a chance to reject the mode entirely.
 387          */
 388         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 389
 390                 if (encoder->crtc != crtc)
 391                         continue;
 392                 encoder_funcs = encoder->helper_private;
 393                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, adjusted_mode))) {
 394                         goto done;
 395                 }
 396         }
 397
 398         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 399                 goto done;
 400         }
 401
 402         /* Prepare the encoders and CRTCs before setting the mode. */
 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                 /* Disable the encoders as the first thing we do. */
 409                 encoder_funcs->prepare(encoder);
 410         }
 411
 412         crtc_funcs->prepare(crtc);
 413
 414         /* Set up the DPLL and any encoders state that needs to adjust or depend
 415          * on the DPLL.
 416          */
 417         crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y);
 418
 419         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 420
 421                 if (encoder->crtc != crtc)
 422                         continue;
 423
 424                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder), mode->name, mode->base.id);
 425                 encoder_funcs = encoder->helper_private;
 426                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 427         }
 428
 429         /* Now, enable the clocks, plane, pipe, and connectors that we set up. */
 430         crtc_funcs->commit(crtc);
 431
 432         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 433
 434                 if (encoder->crtc != crtc)
 435                         continue;
 436
 437                 encoder_funcs = encoder->helper_private;
 438                 encoder_funcs->commit(encoder);
 439
 440         }
 441
 442         /* XXX free adjustedmode */
 443         drm_mode_destroy(dev, adjusted_mode);
 444         /* TODO */
 445 //      if (scrn->pScreen)
 446 //              drm_crtc_set_screen_sub_pixel_order(dev);
 447
 448 done:
 449         if (!ret) {
 450                 crtc->mode = saved_mode;
 451                 crtc->x = saved_x;
 452                 crtc->y = saved_y;
 453         }
 454
 455         return ret;
 456 }
 457 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 458
 459
 460 /**
 461  * drm_crtc_helper_set_config - set a new config from userspace
 462  * @crtc: CRTC to setup
 463  * @crtc_info: user provided configuration
 464  * @new_mode: new mode to set
 465  * @connector_set: set of connectors for the new config
 466  * @fb: new framebuffer
 467  *
 468  * LOCKING:
 469  * Caller must hold mode config lock.
 470  *
 471  * Setup a new configuration, provided by the user in @crtc_info, and enable
 472  * it.
 473  *
 474  * RETURNS:
 475  * Zero. (FIXME)
 476  */
 477 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 478 {
 479         struct drm_device *dev;
 480         struct drm_crtc **save_crtcs, *new_crtc;
 481         struct drm_encoder **save_encoders, *new_encoder;
 482         bool save_enabled;
 483         bool changed = false;
 484         bool flip_or_move = false;
 485         struct drm_connector *connector;
 486         int count = 0, ro, fail = 0;
 487         struct drm_crtc_helper_funcs *crtc_funcs;
 488         int ret = 0;
 489
 490         DRM_DEBUG("\n");
 491
 492         if (!set)
 493                 return -EINVAL;
 494
 495         if (!set->crtc)
 496                 return -EINVAL;
 497
 498         if (!set->crtc->helper_private)
 499                 return -EINVAL;
 500
 501         crtc_funcs = set->crtc->helper_private;
 502
 503         DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %i (x, y) (%i, %i)\n", set->crtc, set->crtc->base.id, set->fb, set->connectors, set->num_connectors, set->x, set->y);
 504
 505         dev = set->crtc->dev;
 506
 507         /* save previous config */
 508         save_enabled = set->crtc->enabled;
 509
 510         /* this is meant to be num_connector not num_crtc */
 511         save_crtcs = kzalloc(dev->mode_config.num_connector * sizeof(struct drm_crtc *), GFP_KERNEL);
 512         if (!save_crtcs)
 513                 return -ENOMEM;
 514
 515         save_encoders = kzalloc(dev->mode_config.num_connector * sizeof(struct drm_encoders *), GFP_KERNEL);
 516         if (!save_encoders) {
 517                 kfree(save_crtcs);
 518                 return -ENOMEM;
 519         }
 520
 521         /* We should be able to check here if the fb has the same properties
 522          * and then just flip_or_move it */
 523         if (set->crtc->fb != set->fb) {
 524                 /* if we have no fb then its a change not a flip */
 525                 if (set->crtc->fb == NULL)
 526                         changed = true;
 527                 else
 528                         flip_or_move = true;
 529         }
 530
 531         if (set->x != set->crtc->x || set->y != set->crtc->y)
 532                 flip_or_move = true;
 533
 534         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 535                 DRM_DEBUG("modes are different\n");
 536                 drm_mode_debug_printmodeline(&set->crtc->mode);
 537                 drm_mode_debug_printmodeline(set->mode);
 538                 changed = true;
 539         }
 540
 541         /* a) traverse passed in connector list and get encoders for them */
 542         count = 0;
 543         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 544                 struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
 545                 save_encoders[count++] = connector->encoder;
 546                 new_encoder = connector->encoder;
 547                 for (ro = 0; ro < set->num_connectors; ro++) {
 548                         if (set->connectors[ro] == connector) {
 549                                 new_encoder = connector_funcs->best_encoder(connector);
 550                                 /* if we can't get an encoder for a connector
 551                                    we are setting now - then fail */
 552                                 if (new_encoder == NULL)
 553                                         /* don't break so fail path works correct */
 554                                         fail = 1;
 555                                 break;
 556                         }
 557                 }
 558
 559                 if (new_encoder != connector->encoder) {
 560                         changed = true;
 561                         connector->encoder = new_encoder;
 562                 }
 563         }
 564
 565         if (fail) {
 566                 ret = -EINVAL;
 567                 goto fail_no_encoder;
 568         }
 569
 570         count = 0;
 571         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 572                 if (!connector->encoder)
 573                         continue;
 574
 575                 save_crtcs[count++] = connector->encoder->crtc;
 576
 577                 if (connector->encoder->crtc == set->crtc)
 578                         new_crtc = NULL;
 579                 else
 580                         new_crtc = connector->encoder->crtc;
 581
 582                 for (ro = 0; ro < set->num_connectors; ro++) {
 583                         if (set->connectors[ro] == connector)
 584                                 new_crtc = set->crtc;
 585                 }
 586                 if (new_crtc != connector->encoder->crtc) {
 587                         changed = true;
 588                         connector->encoder->crtc = new_crtc;
 589                 }
 590         }
 591
 592         /* mode_set_base is not a required function */
 593         if (flip_or_move && !crtc_funcs->mode_set_base)
 594                 changed = true;
 595
 596         if (changed) {
 597                 set->crtc->fb = set->fb;
 598                 set->crtc->enabled = (set->mode != NULL);
 599                 if (set->mode != NULL) {
 600                         DRM_DEBUG("attempting to set mode from userspace\n");
 601                         drm_mode_debug_printmodeline(set->mode);
 602                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode, set->x,
 603                                                       set->y)) {
 604                                 ret = -EINVAL;
 605                                 goto fail_set_mode;
 606                         }
 607                         /* TODO are these needed? */
 608                         set->crtc->desired_x = set->x;
 609                         set->crtc->desired_y = set->y;
 610                         set->crtc->desired_mode = set->mode;
 611                 }
 612                 drm_helper_disable_unused_functions(dev);
 613         } else if (flip_or_move) {
 614                 if (set->crtc->fb != set->fb)
 615                         set->crtc->fb = set->fb;
 616                 crtc_funcs->mode_set_base(set->crtc, set->x, set->y);
 617         }
 618
 619         kfree(save_encoders);
 620         kfree(save_crtcs);
 621         return 0;
 622
 623 fail_set_mode:
 624         set->crtc->enabled = save_enabled;
 625         count = 0;
 626         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 627                 connector->encoder->crtc = save_crtcs[count++];
 628 fail_no_encoder:
 629         kfree(save_crtcs);
 630         count = 0;
 631         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 632                 connector->encoder = save_encoders[count++];
 633         }
 634         kfree(save_encoders);
 635         return ret;
 636
 637
 638 }
 639 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 640
 641 bool drm_helper_plugged_event(struct drm_device *dev)
 642 {
 643         DRM_DEBUG("\n");
 644
 645         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width, dev->mode_config.max_height);
 646
 647         drm_pick_crtcs(dev);
 648
 649         /* alert the driver fb layer */
 650         dev->mode_config.funcs->fb_changed(dev);
 651
 652         drm_helper_disable_unused_functions(dev);
 653
 654         drm_sysfs_hotplug_event(dev);
 655         return true;
 656 }
 657 /**
 658  * drm_initial_config - setup a sane initial connector configuration
 659  * @dev: DRM device
 660  * @can_grow: this configuration is growable
 661  *
 662  * LOCKING:
 663  * Called at init time, must take mode config lock.
 664  *
 665  * Scan the CRTCs and connectors and try to put together an initial setup.
 666  * At the moment, this is a cloned configuration across all heads with
 667  * a new framebuffer object as the backing store.
 668  *
 669  * RETURNS:
 670  * Zero if everything went ok, nonzero otherwise.
 671  */
 672 bool drm_helper_initial_config(struct drm_device *dev, bool can_grow)
 673 {
 674         int ret = false;
 675
 676         drm_helper_plugged_event(dev);
 677         return ret;
 678 }
 679 EXPORT_SYMBOL(drm_helper_initial_config);
 680
 681 /**
 682  * drm_hotplug_stage_two
 683  * @dev DRM device
 684  * @connector hotpluged connector
 685  *
 686  * LOCKING.
 687  * Caller must hold mode config lock, function might grab struct lock.
 688  *
 689  * Stage two of a hotplug.
 690  *
 691  * RETURNS:
 692  * Zero on success, errno on failure.
 693  */
 694 int drm_helper_hotplug_stage_two(struct drm_device *dev)
 695 {
 696         dev->mode_config.hotplug_counter++;
 697
 698         drm_helper_plugged_event(dev);
 699
 700         return 0;
 701 }
 702 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
 703
 704 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 705                                    struct drm_mode_fb_cmd *mode_cmd)
 706 {
 707         fb->width = mode_cmd->width;
 708         fb->height = mode_cmd->height;
 709         fb->pitch = mode_cmd->pitch;
 710         fb->bits_per_pixel = mode_cmd->bpp;
 711         fb->depth = mode_cmd->depth;
 712         fb->mm_handle = mode_cmd->handle;
 713
 714         return 0;
 715 }
 716 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 717
 718