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 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 200 {
 201         struct drm_display_mode *mode;
 202
 203         list_for_each_entry(mode, &connector->modes, head) {
 204                 if (drm_mode_width(mode) > width ||
 205                     drm_mode_height(mode) > height)
 206                         continue;
 207                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 208                         return mode;
 209         }
 210         return NULL;
 211 }
 212
 213 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 214 {
 215         bool enable;
 216
 217         if (strict) {
 218                 enable = connector->status == connector_status_connected;
 219         } else {
 220                 enable = connector->status != connector_status_disconnected;
 221         }
 222         return enable;
 223 }
 224
 225 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 226 {
 227         bool any_enabled = false;
 228         struct drm_connector *connector;
 229         int i = 0;
 230
 231         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 232                 any_enabled |= enabled[i] = drm_connector_enabled(connector, true);
 233                 i++;
 234         }
 235
 236         if (!any_enabled) {
 237                 i = 0;
 238                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 239                         enabled[i] = drm_connector_enabled(connector, false);
 240                         i++;
 241                 }
 242         }
 243 }
 244
 245 static bool drm_target_preferred(struct drm_device *dev, struct drm_display_mode **modes,
 246                                  bool *enabled, int width, int height)
 247 {
 248         struct drm_connector *connector;
 249         struct drm_display_mode *preferred;
 250         int i = 0;
 251
 252         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 253
 254                 if (enabled[i] == false) {
 255                         i++;
 256                         continue;
 257                 }
 258
 259                 modes[i] = drm_has_preferred_mode(connector, width, height);
 260                 if (!modes[i]) {
 261                         list_for_each_entry(modes[i], &connector->modes, head)
 262                                 break;
 263                 }
 264                 i++;
 265         }
 266         return true;
 267 }
 268
 269 static int drm_pick_crtcs(struct drm_device *dev,
 270                           struct drm_crtc **best_crtcs,
 271                           struct drm_display_mode **modes,
 272                           int n, int width, int height)
 273 {
 274         int c, o;
 275         struct drm_connector *connector;
 276         struct drm_connector_helper_funcs *connector_funcs;
 277         struct drm_encoder *encoder;
 278         struct drm_crtc *best_crtc;
 279         int my_score, best_score, score;
 280         struct drm_crtc **crtcs, *crtc;
 281
 282         if (n == dev->mode_config.num_connector)
 283                 return 0;
 284         c = 0;
 285         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 286                 if (c == n)
 287                         break;
 288                 c++;
 289         }
 290
 291         best_crtcs[n] = NULL;
 292         best_crtc = NULL;
 293         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 294         if (modes[n] == NULL)
 295                 return best_score;
 296
 297         crtcs = kmalloc(dev->mode_config.num_connector * sizeof(struct drm_crtc *), GFP_KERNEL);
 298         if (!crtcs)
 299                 return best_score;
 300
 301         my_score = 1;
 302         if (connector->status == connector_status_connected)
 303                 my_score++;
 304         if (drm_has_preferred_mode(connector, width, height))
 305                 my_score++;
 306
 307         connector_funcs = connector->helper_private;
 308         encoder = connector_funcs->best_encoder(connector);
 309         if (!encoder)
 310                 goto out;
 311
 312         connector->encoder = encoder;
 313
 314         /* select a crtc for this connector and then attempt to configure
 315            remaining connectors */
 316         c = 0;
 317         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 318
 319                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
 320                         c++;
 321                         continue;
 322                 }
 323
 324                 for (o = 0; o < n; o++)
 325                         if (best_crtcs[o] == crtc)
 326                                 break;
 327
 328                 if (o < n) {
 329                         /* ignore cloning for now */
 330                         c++;
 331                         continue;
 332                 }
 333
 334                 crtcs[n] = crtc;
 335                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 336                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1, width, height);
 337                 if (score > best_score) {
 338                         best_crtc = crtc;
 339                         best_score = score;
 340                         memcpy(best_crtcs, crtcs, dev->mode_config.num_connector * sizeof(struct drm_crtc *));
 341                 }
 342                 c++;
 343         }
 344 out:
 345         kfree(crtcs);
 346         return best_score;
 347 }
 348
 349 static void drm_setup_crtcs(struct drm_device *dev)
 350 {
 351         struct drm_crtc **crtcs;
 352         struct drm_display_mode **modes;
 353         struct drm_encoder *encoder;
 354         struct drm_connector *connector;
 355         bool *enabled;
 356         int width, height;
 357         int i, ret;
 358
 359         width = dev->mode_config.max_width;
 360         height = dev->mode_config.max_height;
 361
 362         /* clean out all the encoder/crtc combos */
 363         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 364                 encoder->crtc = NULL;
 365         }
 366
 367         crtcs = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_crtc *), GFP_KERNEL);
 368         modes = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_display_mode *), GFP_KERNEL);
 369         enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool), GFP_KERNEL);
 370
 371         drm_enable_connectors(dev, enabled);
 372
 373         ret = drm_target_preferred(dev, modes, enabled, width, height);
 374         if (!ret)
 375                 DRM_ERROR("Unable to find initial modes\n");
 376
 377         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 378
 379         i = 0;
 380         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 381                 struct drm_display_mode *mode = modes[i];
 382                 struct drm_crtc *crtc = crtcs[i];
 383
 384                 if (connector->encoder == NULL) {
 385                         i++;
 386                         continue;
 387                 }
 388
 389                 if (mode && crtc) {
 390                         crtc->desired_mode = mode;
 391                         connector->encoder->crtc = crtc;
 392                 } else
 393                         connector->encoder->crtc = NULL;
 394                 i++;
 395         }
 396
 397         kfree(crtcs);
 398         kfree(modes);
 399         kfree(enabled);
 400 }
 401 /**
 402  * drm_crtc_set_mode - set a mode
 403  * @crtc: CRTC to program
 404  * @mode: mode to use
 405  * @x: width of mode
 406  * @y: height of mode
 407  *
 408  * LOCKING:
 409  * Caller must hold mode config lock.
 410  *
 411  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 412  * to fixup or reject the mode prior to trying to set it.
 413  *
 414  * RETURNS:
 415  * True if the mode was set successfully, or false otherwise.
 416  */
 417 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, struct drm_display_mode *mode,
 418                               int x, int y)
 419 {
 420         struct drm_device *dev = crtc->dev;
 421         struct drm_display_mode *adjusted_mode, saved_mode;
 422         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 423         struct drm_encoder_helper_funcs *encoder_funcs;
 424         int saved_x, saved_y;
 425         struct drm_encoder *encoder;
 426         bool ret = true;
 427
 428         adjusted_mode = drm_mode_duplicate(dev, mode);
 429
 430         crtc->enabled = drm_helper_crtc_in_use(crtc);
 431
 432         if (!crtc->enabled)
 433                 return true;
 434
 435         saved_mode = crtc->mode;
 436         saved_x = crtc->x;
 437         saved_y = crtc->y;
 438
 439         /* Update crtc values up front so the driver can rely on them for mode
 440          * setting.
 441          */
 442         crtc->mode = *mode;
 443         crtc->x = x;
 444         crtc->y = y;
 445
 446         if (drm_mode_equal(&saved_mode, &crtc->mode)) {
 447                 if (saved_x != crtc->x || saved_y != crtc->y) {
 448                         crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y);
 449                         goto done;
 450                 }
 451         }
 452
 453         /* Pass our mode to the connectors and the CRTC to give them a chance to
 454          * adjust it according to limitations or connector properties, and also
 455          * a chance to reject the mode entirely.
 456          */
 457         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 458
 459                 if (encoder->crtc != crtc)
 460                         continue;
 461                 encoder_funcs = encoder->helper_private;
 462                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode, adjusted_mode))) {
 463                         goto done;
 464                 }
 465         }
 466
 467         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 468                 goto done;
 469         }
 470
 471         /* Prepare the encoders and CRTCs before setting the mode. */
 472         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 473
 474                 if (encoder->crtc != crtc)
 475                         continue;
 476                 encoder_funcs = encoder->helper_private;
 477                 /* Disable the encoders as the first thing we do. */
 478                 encoder_funcs->prepare(encoder);
 479         }
 480
 481         crtc_funcs->prepare(crtc);
 482
 483         /* Set up the DPLL and any encoders state that needs to adjust or depend
 484          * on the DPLL.
 485          */
 486         crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y);
 487
 488         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 489
 490                 if (encoder->crtc != crtc)
 491                         continue;
 492
 493                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder), mode->name, mode->base.id);
 494                 encoder_funcs = encoder->helper_private;
 495                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 496         }
 497
 498         /* Now, enable the clocks, plane, pipe, and connectors that we set up. */
 499         crtc_funcs->commit(crtc);
 500
 501         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 502
 503                 if (encoder->crtc != crtc)
 504                         continue;
 505
 506                 encoder_funcs = encoder->helper_private;
 507                 encoder_funcs->commit(encoder);
 508
 509         }
 510
 511         /* XXX free adjustedmode */
 512         drm_mode_destroy(dev, adjusted_mode);
 513         /* TODO */
 514 //      if (scrn->pScreen)
 515 //              drm_crtc_set_screen_sub_pixel_order(dev);
 516
 517 done:
 518         if (!ret) {
 519                 crtc->mode = saved_mode;
 520                 crtc->x = saved_x;
 521                 crtc->y = saved_y;
 522         }
 523
 524         return ret;
 525 }
 526 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 527
 528
 529 /**
 530  * drm_crtc_helper_set_config - set a new config from userspace
 531  * @crtc: CRTC to setup
 532  * @crtc_info: user provided configuration
 533  * @new_mode: new mode to set
 534  * @connector_set: set of connectors for the new config
 535  * @fb: new framebuffer
 536  *
 537  * LOCKING:
 538  * Caller must hold mode config lock.
 539  *
 540  * Setup a new configuration, provided by the user in @crtc_info, and enable
 541  * it.
 542  *
 543  * RETURNS:
 544  * Zero. (FIXME)
 545  */
 546 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 547 {
 548         struct drm_device *dev;
 549         struct drm_crtc **save_crtcs, *new_crtc;
 550         struct drm_encoder **save_encoders, *new_encoder;
 551         bool save_enabled;
 552         bool changed = false;
 553         bool flip_or_move = false;
 554         struct drm_connector *connector;
 555         int count = 0, ro, fail = 0;
 556         struct drm_crtc_helper_funcs *crtc_funcs;
 557         int ret = 0;
 558
 559         DRM_DEBUG("\n");
 560
 561         if (!set)
 562                 return -EINVAL;
 563
 564         if (!set->crtc)
 565                 return -EINVAL;
 566
 567         if (!set->crtc->helper_private)
 568                 return -EINVAL;
 569
 570         crtc_funcs = set->crtc->helper_private;
 571
 572         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);
 573
 574         dev = set->crtc->dev;
 575
 576         /* save previous config */
 577         save_enabled = set->crtc->enabled;
 578
 579         /* this is meant to be num_connector not num_crtc */
 580         save_crtcs = kzalloc(dev->mode_config.num_connector * sizeof(struct drm_crtc *), GFP_KERNEL);
 581         if (!save_crtcs)
 582                 return -ENOMEM;
 583
 584         save_encoders = kzalloc(dev->mode_config.num_connector * sizeof(struct drm_encoders *), GFP_KERNEL);
 585         if (!save_encoders) {
 586                 kfree(save_crtcs);
 587                 return -ENOMEM;
 588         }
 589
 590         /* We should be able to check here if the fb has the same properties
 591          * and then just flip_or_move it */
 592         if (set->crtc->fb != set->fb) {
 593                 /* if we have no fb then its a change not a flip */
 594                 if (set->crtc->fb == NULL)
 595                         changed = true;
 596                 else
 597                         flip_or_move = true;
 598         }
 599
 600         if (set->x != set->crtc->x || set->y != set->crtc->y)
 601                 flip_or_move = true;
 602
 603         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 604                 DRM_DEBUG("modes are different\n");
 605                 drm_mode_debug_printmodeline(&set->crtc->mode);
 606                 drm_mode_debug_printmodeline(set->mode);
 607                 changed = true;
 608         }
 609
 610         /* a) traverse passed in connector list and get encoders for them */
 611         count = 0;
 612         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 613                 struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
 614                 save_encoders[count++] = connector->encoder;
 615                 new_encoder = connector->encoder;
 616                 for (ro = 0; ro < set->num_connectors; ro++) {
 617                         if (set->connectors[ro] == connector) {
 618                                 new_encoder = connector_funcs->best_encoder(connector);
 619                                 /* if we can't get an encoder for a connector
 620                                    we are setting now - then fail */
 621                                 if (new_encoder == NULL)
 622                                         /* don't break so fail path works correct */
 623                                         fail = 1;
 624                                 break;
 625                         }
 626                 }
 627
 628                 if (new_encoder != connector->encoder) {
 629                         changed = true;
 630                         connector->encoder = new_encoder;
 631                 }
 632         }
 633
 634         if (fail) {
 635                 ret = -EINVAL;
 636                 goto fail_no_encoder;
 637         }
 638
 639         count = 0;
 640         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 641                 if (!connector->encoder)
 642                         continue;
 643
 644                 save_crtcs[count++] = connector->encoder->crtc;
 645
 646                 if (connector->encoder->crtc == set->crtc)
 647                         new_crtc = NULL;
 648                 else
 649                         new_crtc = connector->encoder->crtc;
 650
 651                 for (ro = 0; ro < set->num_connectors; ro++) {
 652                         if (set->connectors[ro] == connector)
 653                                 new_crtc = set->crtc;
 654                 }
 655                 if (new_crtc != connector->encoder->crtc) {
 656                         changed = true;
 657                         connector->encoder->crtc = new_crtc;
 658                 }
 659         }
 660
 661         /* mode_set_base is not a required function */
 662         if (flip_or_move && !crtc_funcs->mode_set_base)
 663                 changed = true;
 664
 665         if (changed) {
 666                 set->crtc->fb = set->fb;
 667                 set->crtc->enabled = (set->mode != NULL);
 668                 if (set->mode != NULL) {
 669                         DRM_DEBUG("attempting to set mode from userspace\n");
 670                         drm_mode_debug_printmodeline(set->mode);
 671                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode, set->x,
 672                                                       set->y)) {
 673                                 ret = -EINVAL;
 674                                 goto fail_set_mode;
 675                         }
 676                         /* TODO are these needed? */
 677                         set->crtc->desired_x = set->x;
 678                         set->crtc->desired_y = set->y;
 679                         set->crtc->desired_mode = set->mode;
 680                 }
 681                 drm_helper_disable_unused_functions(dev);
 682         } else if (flip_or_move) {
 683                 if (set->crtc->fb != set->fb)
 684                         set->crtc->fb = set->fb;
 685                 crtc_funcs->mode_set_base(set->crtc, set->x, set->y);
 686         }
 687
 688         kfree(save_encoders);
 689         kfree(save_crtcs);
 690         return 0;
 691
 692 fail_set_mode:
 693         set->crtc->enabled = save_enabled;
 694         count = 0;
 695         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 696                 connector->encoder->crtc = save_crtcs[count++];
 697 fail_no_encoder:
 698         kfree(save_crtcs);
 699         count = 0;
 700         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 701                 connector->encoder = save_encoders[count++];
 702         }
 703         kfree(save_encoders);
 704         return ret;
 705
 706
 707 }
 708 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 709
 710 bool drm_helper_plugged_event(struct drm_device *dev)
 711 {
 712         DRM_DEBUG("\n");
 713
 714         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width, dev->mode_config.max_height);
 715
 716         drm_setup_crtcs(dev);
 717
 718         /* alert the driver fb layer */
 719         dev->mode_config.funcs->fb_changed(dev);
 720
 721         drm_helper_disable_unused_functions(dev);
 722
 723         drm_sysfs_hotplug_event(dev);
 724         return true;
 725 }
 726 /**
 727  * drm_initial_config - setup a sane initial connector configuration
 728  * @dev: DRM device
 729  * @can_grow: this configuration is growable
 730  *
 731  * LOCKING:
 732  * Called at init time, must take mode config lock.
 733  *
 734  * Scan the CRTCs and connectors and try to put together an initial setup.
 735  * At the moment, this is a cloned configuration across all heads with
 736  * a new framebuffer object as the backing store.
 737  *
 738  * RETURNS:
 739  * Zero if everything went ok, nonzero otherwise.
 740  */
 741 bool drm_helper_initial_config(struct drm_device *dev, bool can_grow)
 742 {
 743         int ret = false;
 744
 745         drm_helper_plugged_event(dev);
 746         return ret;
 747 }
 748 EXPORT_SYMBOL(drm_helper_initial_config);
 749
 750 /**
 751  * drm_hotplug_stage_two
 752  * @dev DRM device
 753  * @connector hotpluged connector
 754  *
 755  * LOCKING.
 756  * Caller must hold mode config lock, function might grab struct lock.
 757  *
 758  * Stage two of a hotplug.
 759  *
 760  * RETURNS:
 761  * Zero on success, errno on failure.
 762  */
 763 int drm_helper_hotplug_stage_two(struct drm_device *dev)
 764 {
 765         dev->mode_config.hotplug_counter++;
 766
 767         drm_helper_plugged_event(dev);
 768
 769         return 0;
 770 }
 771 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
 772
 773 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 774                                    struct drm_mode_fb_cmd *mode_cmd,
 775                                    void *mm_private)
 776 {
 777         fb->width = mode_cmd->width;
 778         fb->height = mode_cmd->height;
 779         fb->pitch = mode_cmd->pitch;
 780         fb->bits_per_pixel = mode_cmd->bpp;
 781         fb->depth = mode_cmd->depth;
 782         fb->mm_private = mm_private;
 783
 784         return 0;
 785 }
 786 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 787
 788 int drm_helper_resume_force_mode(struct drm_device *dev)
 789 {
 790         struct drm_crtc *crtc;
 791         int ret;
 792
 793         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 794
 795                 if (!crtc->enabled)
 796                         continue;
 797
 798                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, crtc->x,
 799                                                crtc->y);
 800
 801                 if (ret == false)
 802                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 803         }
 804         return 0;
 805 }
 806 EXPORT_SYMBOL(drm_helper_resume_force_mode);