drivers/gpu/drm/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  *
   5  * DRM core CRTC related functions
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that copyright
  10  * notice and this permission notice appear in supporting documentation, and
  11  * that the name of the copyright holders not be used in advertising or
  12  * publicity pertaining to distribution of the software without specific,
  13  * written prior permission.  The copyright holders make no representations
  14  * about the suitability of this software for any purpose.  It is provided "as
  15  * is" without express or implied warranty.
  16  *
  17  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23  * OF THIS SOFTWARE.
  24  *
  25  * Authors:
  26  *      Keith Packard
  27  *      Eric Anholt <eric@anholt.net>
  28  *      Dave Airlie <airlied@linux.ie>
  29  *      Jesse Barnes <jesse.barnes@intel.com>
  30  */
  31
  32 #include "drmP.h"
  33 #include "drm_crtc.h"
  34 #include "drm_crtc_helper.h"
  35
  36 /*
  37  * Detailed mode info for 800x600@60Hz
  38  */
  39 static struct drm_display_mode std_modes[] = {
  40         { DRM_MODE("800x600", DRM_MODE_TYPE_DEFAULT, 40000, 800, 840,
  41                    968, 1056, 0, 600, 601, 605, 628, 0,
  42                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
  43 };
  44
  45 static void drm_mode_validate_flag(struct drm_connector *connector,
  46                                    int flags)
  47 {
  48         struct drm_display_mode *mode, *t;
  49
  50         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  51                 return;
  52
  53         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  54                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  55                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  56                         mode->status = MODE_NO_INTERLACE;
  57                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  58                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  59                         mode->status = MODE_NO_DBLESCAN;
  60         }
  61
  62         return;
  63 }
  64
  65 /**
  66  * drm_helper_probe_connector_modes - get complete set of display modes
  67  * @dev: DRM device
  68  * @maxX: max width for modes
  69  * @maxY: max height for modes
  70  *
  71  * LOCKING:
  72  * Caller must hold mode config lock.
  73  *
  74  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  75  * modes on them.  Modes will first be added to the connector's probed_modes
  76  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  77  * put into the normal modes list.
  78  *
  79  * Intended to be used either at bootup time or when major configuration
  80  * changes have occurred.
  81  *
  82  * FIXME: take into account monitor limits
  83  *
  84  * RETURNS:
  85  * Number of modes found on @connector.
  86  */
  87 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  88                                             uint32_t maxX, uint32_t maxY)
  89 {
  90         struct drm_device *dev = connector->dev;
  91         struct drm_display_mode *mode, *t;
  92         struct drm_connector_helper_funcs *connector_funcs =
  93                 connector->helper_private;
  94         int count = 0;
  95         int mode_flags = 0;
  96
  97         DRM_DEBUG("%s\n", drm_get_connector_name(connector));
  98         /* set all modes to the unverified state */
  99         list_for_each_entry_safe(mode, t, &connector->modes, head)
 100                 mode->status = MODE_UNVERIFIED;
 101
 102         connector->status = connector->funcs->detect(connector);
 103
 104         if (connector->status == connector_status_disconnected) {
 105                 DRM_DEBUG("%s is disconnected\n",
 106                           drm_get_connector_name(connector));
 107                 /* TODO set EDID to NULL */
 108                 return 0;
 109         }
 110
 111         count = (*connector_funcs->get_modes)(connector);
 112         if (!count)
 113                 return 0;
 114
 115         drm_mode_connector_list_update(connector);
 116
 117         if (maxX && maxY)
 118                 drm_mode_validate_size(dev, &connector->modes, maxX,
 119                                        maxY, 0);
 120
 121         if (connector->interlace_allowed)
 122                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 123         if (connector->doublescan_allowed)
 124                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 125         drm_mode_validate_flag(connector, mode_flags);
 126
 127         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 128                 if (mode->status == MODE_OK)
 129                         mode->status = connector_funcs->mode_valid(connector,
 130                                                                    mode);
 131         }
 132
 133
 134         drm_mode_prune_invalid(dev, &connector->modes, true);
 135
 136         if (list_empty(&connector->modes))
 137                 return 0;
 138
 139         drm_mode_sort(&connector->modes);
 140
 141         DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
 142         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 143                 mode->vrefresh = drm_mode_vrefresh(mode);
 144
 145                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 146                 drm_mode_debug_printmodeline(mode);
 147         }
 148
 149         return count;
 150 }
 151 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 152
 153 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
 154                                       uint32_t maxY)
 155 {
 156         struct drm_connector *connector;
 157         int count = 0;
 158
 159         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 160                 count += drm_helper_probe_single_connector_modes(connector,
 161                                                                  maxX, maxY);
 162         }
 163
 164         return count;
 165 }
 166 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
 167
 168 static void drm_helper_add_std_modes(struct drm_device *dev,
 169                                      struct drm_connector *connector)
 170 {
 171         struct drm_display_mode *mode, *t;
 172         int i;
 173
 174         for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
 175                 struct drm_display_mode *stdmode;
 176
 177                 /*
 178                  * When no valid EDID modes are available we end up
 179                  * here and bailed in the past, now we add some standard
 180                  * modes and move on.
 181                  */
 182                 stdmode = drm_mode_duplicate(dev, &std_modes[i]);
 183                 drm_mode_probed_add(connector, stdmode);
 184                 drm_mode_list_concat(&connector->probed_modes,
 185                                      &connector->modes);
 186
 187                 DRM_DEBUG("Adding mode %s to %s\n", stdmode->name,
 188                           drm_get_connector_name(connector));
 189         }
 190         drm_mode_sort(&connector->modes);
 191
 192         DRM_DEBUG("Added std modes on %s\n", drm_get_connector_name(connector));
 193         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 194                 mode->vrefresh = drm_mode_vrefresh(mode);
 195
 196                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 197                 drm_mode_debug_printmodeline(mode);
 198         }
 199 }
 200
 201 /**
 202  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 203  * @crtc: CRTC to check
 204  *
 205  * LOCKING:
 206  * Caller must hold mode config lock.
 207  *
 208  * Walk @crtc's DRM device's mode_config and see if it's in use.
 209  *
 210  * RETURNS:
 211  * True if @crtc is part of the mode_config, false otherwise.
 212  */
 213 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 214 {
 215         struct drm_encoder *encoder;
 216         struct drm_device *dev = crtc->dev;
 217         /* FIXME: Locking around list access? */
 218         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 219                 if (encoder->crtc == crtc)
 220                         return true;
 221         return false;
 222 }
 223 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 224
 225 /**
 226  * drm_disable_unused_functions - disable unused objects
 227  * @dev: DRM device
 228  *
 229  * LOCKING:
 230  * Caller must hold mode config lock.
 231  *
 232  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 233  * by calling its dpms function, which should power it off.
 234  */
 235 void drm_helper_disable_unused_functions(struct drm_device *dev)
 236 {
 237         struct drm_encoder *encoder;
 238         struct drm_encoder_helper_funcs *encoder_funcs;
 239         struct drm_crtc *crtc;
 240
 241         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 242                 encoder_funcs = encoder->helper_private;
 243                 if (!encoder->crtc)
 244                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 245         }
 246
 247         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 248                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 249                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 250                 if (!crtc->enabled) {
 251                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 252                         crtc->fb = NULL;
 253                 }
 254         }
 255 }
 256 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 257
 258 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 259 {
 260         struct drm_display_mode *mode;
 261
 262         list_for_each_entry(mode, &connector->modes, head) {
 263                 if (drm_mode_width(mode) > width ||
 264                     drm_mode_height(mode) > height)
 265                         continue;
 266                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 267                         return mode;
 268         }
 269         return NULL;
 270 }
 271
 272 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 273 {
 274         bool enable;
 275
 276         if (strict) {
 277                 enable = connector->status == connector_status_connected;
 278         } else {
 279                 enable = connector->status != connector_status_disconnected;
 280         }
 281         return enable;
 282 }
 283
 284 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 285 {
 286         bool any_enabled = false;
 287         struct drm_connector *connector;
 288         int i = 0;
 289
 290         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 291                 enabled[i] = drm_connector_enabled(connector, true);
 292                 DRM_DEBUG("connector %d enabled? %s\n", connector->base.id,
 293                           enabled[i] ? "yes" : "no");
 294                 any_enabled |= enabled[i];
 295                 i++;
 296         }
 297
 298         if (any_enabled)
 299                 return;
 300
 301         i = 0;
 302         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 303                 enabled[i] = drm_connector_enabled(connector, false);
 304                 i++;
 305         }
 306 }
 307
 308 static bool drm_target_preferred(struct drm_device *dev,
 309                                  struct drm_display_mode **modes,
 310                                  bool *enabled, int width, int height)
 311 {
 312         struct drm_connector *connector;
 313         int i = 0;
 314
 315         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 316
 317                 if (enabled[i] == false) {
 318                         i++;
 319                         continue;
 320                 }
 321
 322                 DRM_DEBUG("looking for preferred mode on connector %d\n",
 323                           connector->base.id);
 324
 325                 modes[i] = drm_has_preferred_mode(connector, width, height);
 326                 /* No preferred modes, pick one off the list */
 327                 if (!modes[i] && !list_empty(&connector->modes)) {
 328                         list_for_each_entry(modes[i], &connector->modes, head)
 329                                 break;
 330                 }
 331                 DRM_DEBUG("found mode %s\n", modes[i] ? modes[i]->name :
 332                           "none");
 333                 i++;
 334         }
 335         return true;
 336 }
 337
 338 static int drm_pick_crtcs(struct drm_device *dev,
 339                           struct drm_crtc **best_crtcs,
 340                           struct drm_display_mode **modes,
 341                           int n, int width, int height)
 342 {
 343         int c, o;
 344         struct drm_connector *connector;
 345         struct drm_connector_helper_funcs *connector_funcs;
 346         struct drm_encoder *encoder;
 347         struct drm_crtc *best_crtc;
 348         int my_score, best_score, score;
 349         struct drm_crtc **crtcs, *crtc;
 350
 351         if (n == dev->mode_config.num_connector)
 352                 return 0;
 353         c = 0;
 354         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 355                 if (c == n)
 356                         break;
 357                 c++;
 358         }
 359
 360         best_crtcs[n] = NULL;
 361         best_crtc = NULL;
 362         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 363         if (modes[n] == NULL)
 364                 return best_score;
 365
 366         crtcs = kmalloc(dev->mode_config.num_connector *
 367                         sizeof(struct drm_crtc *), GFP_KERNEL);
 368         if (!crtcs)
 369                 return best_score;
 370
 371         my_score = 1;
 372         if (connector->status == connector_status_connected)
 373                 my_score++;
 374         if (drm_has_preferred_mode(connector, width, height))
 375                 my_score++;
 376
 377         connector_funcs = connector->helper_private;
 378         encoder = connector_funcs->best_encoder(connector);
 379         if (!encoder)
 380                 goto out;
 381
 382         connector->encoder = encoder;
 383
 384         /* select a crtc for this connector and then attempt to configure
 385            remaining connectors */
 386         c = 0;
 387         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 388
 389                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
 390                         c++;
 391                         continue;
 392                 }
 393
 394                 for (o = 0; o < n; o++)
 395                         if (best_crtcs[o] == crtc)
 396                                 break;
 397
 398                 if (o < n) {
 399                         /* ignore cloning for now */
 400                         c++;
 401                         continue;
 402                 }
 403
 404                 crtcs[n] = crtc;
 405                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 406                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
 407                                                   width, height);
 408                 if (score > best_score) {
 409                         best_crtc = crtc;
 410                         best_score = score;
 411                         memcpy(best_crtcs, crtcs,
 412                                dev->mode_config.num_connector *
 413                                sizeof(struct drm_crtc *));
 414                 }
 415                 c++;
 416         }
 417 out:
 418         kfree(crtcs);
 419         return best_score;
 420 }
 421
 422 static void drm_setup_crtcs(struct drm_device *dev)
 423 {
 424         struct drm_crtc **crtcs;
 425         struct drm_display_mode **modes;
 426         struct drm_encoder *encoder;
 427         struct drm_connector *connector;
 428         bool *enabled;
 429         int width, height;
 430         int i, ret;
 431
 432         DRM_DEBUG("\n");
 433
 434         width = dev->mode_config.max_width;
 435         height = dev->mode_config.max_height;
 436
 437         /* clean out all the encoder/crtc combos */
 438         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 439                 encoder->crtc = NULL;
 440         }
 441
 442         crtcs = kcalloc(dev->mode_config.num_connector,
 443                         sizeof(struct drm_crtc *), GFP_KERNEL);
 444         modes = kcalloc(dev->mode_config.num_connector,
 445                         sizeof(struct drm_display_mode *), GFP_KERNEL);
 446         enabled = kcalloc(dev->mode_config.num_connector,
 447                           sizeof(bool), GFP_KERNEL);
 448
 449         drm_enable_connectors(dev, enabled);
 450
 451         ret = drm_target_preferred(dev, modes, enabled, width, height);
 452         if (!ret)
 453                 DRM_ERROR("Unable to find initial modes\n");
 454
 455         DRM_DEBUG("picking CRTCs for %dx%d config\n", width, height);
 456
 457         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 458
 459         i = 0;
 460         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 461                 struct drm_display_mode *mode = modes[i];
 462                 struct drm_crtc *crtc = crtcs[i];
 463
 464                 if (connector->encoder == NULL) {
 465                         i++;
 466                         continue;
 467                 }
 468
 469                 if (mode && crtc) {
 470                         DRM_DEBUG("desired mode %s set on crtc %d\n",
 471                                   mode->name, crtc->base.id);
 472                         crtc->desired_mode = mode;
 473                         connector->encoder->crtc = crtc;
 474                 } else
 475                         connector->encoder->crtc = NULL;
 476                 i++;
 477         }
 478
 479         kfree(crtcs);
 480         kfree(modes);
 481         kfree(enabled);
 482 }
 483
 484 /**
 485  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 486  * @encoder: encoder to test
 487  * @crtc: crtc to test
 488  *
 489  * Return false if @encoder can't be driven by @crtc, true otherwise.
 490  */
 491 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 492                                 struct drm_crtc *crtc)
 493 {
 494         struct drm_device *dev;
 495         struct drm_crtc *tmp;
 496         int crtc_mask = 1;
 497
 498         WARN(!crtc, "checking null crtc?");
 499
 500         dev = crtc->dev;
 501
 502         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 503                 if (tmp == crtc)
 504                         break;
 505                 crtc_mask <<= 1;
 506         }
 507
 508         if (encoder->possible_crtcs & crtc_mask)
 509                 return true;
 510         return false;
 511 }
 512
 513 /*
 514  * Check the CRTC we're going to map each output to vs. its current
 515  * CRTC.  If they don't match, we have to disable the output and the CRTC
 516  * since the driver will have to re-route things.
 517  */
 518 static void
 519 drm_crtc_prepare_encoders(struct drm_device *dev)
 520 {
 521         struct drm_encoder_helper_funcs *encoder_funcs;
 522         struct drm_encoder *encoder;
 523
 524         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 525                 encoder_funcs = encoder->helper_private;
 526                 /* Disable unused encoders */
 527                 if (encoder->crtc == NULL)
 528                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 529                 /* Disable encoders whose CRTC is about to change */
 530                 if (encoder_funcs->get_crtc &&
 531                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 532                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 533         }
 534 }
 535
 536 /**
 537  * drm_crtc_set_mode - set a mode
 538  * @crtc: CRTC to program
 539  * @mode: mode to use
 540  * @x: width of mode
 541  * @y: height of mode
 542  *
 543  * LOCKING:
 544  * Caller must hold mode config lock.
 545  *
 546  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 547  * to fixup or reject the mode prior to trying to set it.
 548  *
 549  * RETURNS:
 550  * True if the mode was set successfully, or false otherwise.
 551  */
 552 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 553                               struct drm_display_mode *mode,
 554                               int x, int y,
 555                               struct drm_framebuffer *old_fb)
 556 {
 557         struct drm_device *dev = crtc->dev;
 558         struct drm_display_mode *adjusted_mode, saved_mode;
 559         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 560         struct drm_encoder_helper_funcs *encoder_funcs;
 561         int saved_x, saved_y;
 562         struct drm_encoder *encoder;
 563         bool ret = true;
 564
 565         adjusted_mode = drm_mode_duplicate(dev, mode);
 566
 567         crtc->enabled = drm_helper_crtc_in_use(crtc);
 568
 569         if (!crtc->enabled)
 570                 return true;
 571
 572         saved_mode = crtc->mode;
 573         saved_x = crtc->x;
 574         saved_y = crtc->y;
 575
 576         /* Update crtc values up front so the driver can rely on them for mode
 577          * setting.
 578          */
 579         crtc->mode = *mode;
 580         crtc->x = x;
 581         crtc->y = y;
 582
 583         /* Pass our mode to the connectors and the CRTC to give them a chance to
 584          * adjust it according to limitations or connector properties, and also
 585          * a chance to reject the mode entirely.
 586          */
 587         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 588
 589                 if (encoder->crtc != crtc)
 590                         continue;
 591                 encoder_funcs = encoder->helper_private;
 592                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 593                                                       adjusted_mode))) {
 594                         goto done;
 595                 }
 596         }
 597
 598         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 599                 goto done;
 600         }
 601
 602         /* Prepare the encoders and CRTCs before setting the mode. */
 603         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 604
 605                 if (encoder->crtc != crtc)
 606                         continue;
 607                 encoder_funcs = encoder->helper_private;
 608                 /* Disable the encoders as the first thing we do. */
 609                 encoder_funcs->prepare(encoder);
 610         }
 611
 612         drm_crtc_prepare_encoders(dev);
 613
 614         crtc_funcs->prepare(crtc);
 615
 616         /* Set up the DPLL and any encoders state that needs to adjust or depend
 617          * on the DPLL.
 618          */
 619         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 620         if (!ret)
 621             goto done;
 622
 623         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 624
 625                 if (encoder->crtc != crtc)
 626                         continue;
 627
 628                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 629                          mode->name, mode->base.id);
 630                 encoder_funcs = encoder->helper_private;
 631                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 632         }
 633
 634         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 635         crtc_funcs->commit(crtc);
 636
 637         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 638
 639                 if (encoder->crtc != crtc)
 640                         continue;
 641
 642                 encoder_funcs = encoder->helper_private;
 643                 encoder_funcs->commit(encoder);
 644
 645         }
 646
 647         /* XXX free adjustedmode */
 648         drm_mode_destroy(dev, adjusted_mode);
 649         /* FIXME: add subpixel order */
 650 done:
 651         if (!ret) {
 652                 crtc->mode = saved_mode;
 653                 crtc->x = saved_x;
 654                 crtc->y = saved_y;
 655         }
 656
 657         return ret;
 658 }
 659 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 660
 661
 662 /**
 663  * drm_crtc_helper_set_config - set a new config from userspace
 664  * @crtc: CRTC to setup
 665  * @crtc_info: user provided configuration
 666  * @new_mode: new mode to set
 667  * @connector_set: set of connectors for the new config
 668  * @fb: new framebuffer
 669  *
 670  * LOCKING:
 671  * Caller must hold mode config lock.
 672  *
 673  * Setup a new configuration, provided by the user in @crtc_info, and enable
 674  * it.
 675  *
 676  * RETURNS:
 677  * Zero. (FIXME)
 678  */
 679 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 680 {
 681         struct drm_device *dev;
 682         struct drm_crtc **save_crtcs, *new_crtc;
 683         struct drm_encoder **save_encoders, *new_encoder;
 684         struct drm_framebuffer *old_fb = NULL;
 685         bool save_enabled;
 686         bool mode_changed = false;
 687         bool fb_changed = false;
 688         struct drm_connector *connector;
 689         int count = 0, ro, fail = 0;
 690         struct drm_crtc_helper_funcs *crtc_funcs;
 691         int ret = 0;
 692
 693         DRM_DEBUG("\n");
 694
 695         if (!set)
 696                 return -EINVAL;
 697
 698         if (!set->crtc)
 699                 return -EINVAL;
 700
 701         if (!set->crtc->helper_private)
 702                 return -EINVAL;
 703
 704         crtc_funcs = set->crtc->helper_private;
 705
 706         DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %d (x, y) (%i, %i)\n",
 707                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 708                   (int)set->num_connectors, set->x, set->y);
 709
 710         dev = set->crtc->dev;
 711
 712         /* save previous config */
 713         save_enabled = set->crtc->enabled;
 714
 715         /*
 716          * We do mode_config.num_connectors here since we'll look at the
 717          * CRTC and encoder associated with each connector later.
 718          */
 719         save_crtcs = kzalloc(dev->mode_config.num_connector *
 720                              sizeof(struct drm_crtc *), GFP_KERNEL);
 721         if (!save_crtcs)
 722                 return -ENOMEM;
 723
 724         save_encoders = kzalloc(dev->mode_config.num_connector *
 725                                 sizeof(struct drm_encoders *), GFP_KERNEL);
 726         if (!save_encoders) {
 727                 kfree(save_crtcs);
 728                 return -ENOMEM;
 729         }
 730
 731         /* We should be able to check here if the fb has the same properties
 732          * and then just flip_or_move it */
 733         if (set->crtc->fb != set->fb) {
 734                 /* If we have no fb then treat it as a full mode set */
 735                 if (set->crtc->fb == NULL) {
 736                         DRM_DEBUG("crtc has no fb, full mode set\n");
 737                         mode_changed = true;
 738                 } else if ((set->fb->bits_per_pixel !=
 739                          set->crtc->fb->bits_per_pixel) ||
 740                          set->fb->depth != set->crtc->fb->depth)
 741                         fb_changed = true;
 742                 else
 743                         fb_changed = true;
 744         }
 745
 746         if (set->x != set->crtc->x || set->y != set->crtc->y)
 747                 fb_changed = true;
 748
 749         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 750                 DRM_DEBUG("modes are different, full mode set\n");
 751                 drm_mode_debug_printmodeline(&set->crtc->mode);
 752                 drm_mode_debug_printmodeline(set->mode);
 753                 mode_changed = true;
 754         }
 755
 756         /* a) traverse passed in connector list and get encoders for them */
 757         count = 0;
 758         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 759                 struct drm_connector_helper_funcs *connector_funcs =
 760                         connector->helper_private;
 761                 save_encoders[count++] = connector->encoder;
 762                 new_encoder = connector->encoder;
 763                 for (ro = 0; ro < set->num_connectors; ro++) {
 764                         if (set->connectors[ro] == connector) {
 765                                 new_encoder = connector_funcs->best_encoder(connector);
 766                                 /* if we can't get an encoder for a connector
 767                                    we are setting now - then fail */
 768                                 if (new_encoder == NULL)
 769                                         /* don't break so fail path works correct */
 770                                         fail = 1;
 771                                 break;
 772                         }
 773                 }
 774
 775                 if (new_encoder != connector->encoder) {
 776                         DRM_DEBUG("encoder changed, full mode switch\n");
 777                         mode_changed = true;
 778                         connector->encoder = new_encoder;
 779                 }
 780         }
 781
 782         if (fail) {
 783                 ret = -EINVAL;
 784                 goto fail_no_encoder;
 785         }
 786
 787         count = 0;
 788         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 789                 if (!connector->encoder)
 790                         continue;
 791
 792                 save_crtcs[count++] = connector->encoder->crtc;
 793
 794                 if (connector->encoder->crtc == set->crtc)
 795                         new_crtc = NULL;
 796                 else
 797                         new_crtc = connector->encoder->crtc;
 798
 799                 for (ro = 0; ro < set->num_connectors; ro++) {
 800                         if (set->connectors[ro] == connector)
 801                                 new_crtc = set->crtc;
 802                 }
 803
 804                 /* Make sure the new CRTC will work with the encoder */
 805                 if (new_crtc &&
 806                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 807                         ret = -EINVAL;
 808                         goto fail_set_mode;
 809                 }
 810                 if (new_crtc != connector->encoder->crtc) {
 811                         DRM_DEBUG("crtc changed, full mode switch\n");
 812                         mode_changed = true;
 813                         connector->encoder->crtc = new_crtc;
 814                 }
 815                 DRM_DEBUG("setting connector %d crtc to %p\n",
 816                           connector->base.id, new_crtc);
 817         }
 818
 819         /* mode_set_base is not a required function */
 820         if (fb_changed && !crtc_funcs->mode_set_base)
 821                 mode_changed = true;
 822
 823         if (mode_changed) {
 824                 old_fb = set->crtc->fb;
 825                 set->crtc->fb = set->fb;
 826                 set->crtc->enabled = (set->mode != NULL);
 827                 if (set->mode != NULL) {
 828                         DRM_DEBUG("attempting to set mode from userspace\n");
 829                         drm_mode_debug_printmodeline(set->mode);
 830                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 831                                                       set->x, set->y,
 832                                                       old_fb)) {
 833                                 DRM_ERROR("failed to set mode on crtc %p\n",
 834                                           set->crtc);
 835                                 ret = -EINVAL;
 836                                 goto fail_set_mode;
 837                         }
 838                         /* TODO are these needed? */
 839                         set->crtc->desired_x = set->x;
 840                         set->crtc->desired_y = set->y;
 841                         set->crtc->desired_mode = set->mode;
 842                 }
 843                 drm_helper_disable_unused_functions(dev);
 844         } else if (fb_changed) {
 845                 old_fb = set->crtc->fb;
 846                 if (set->crtc->fb != set->fb)
 847                         set->crtc->fb = set->fb;
 848                 ret = crtc_funcs->mode_set_base(set->crtc,
 849                                                 set->x, set->y, old_fb);
 850                 if (ret != 0)
 851                     goto fail_set_mode;
 852         }
 853
 854         kfree(save_encoders);
 855         kfree(save_crtcs);
 856         return 0;
 857
 858 fail_set_mode:
 859         set->crtc->enabled = save_enabled;
 860         set->crtc->fb = old_fb;
 861         count = 0;
 862         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 863                 if (!connector->encoder)
 864                         continue;
 865
 866                 connector->encoder->crtc = save_crtcs[count++];
 867         }
 868 fail_no_encoder:
 869         kfree(save_crtcs);
 870         count = 0;
 871         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 872                 connector->encoder = save_encoders[count++];
 873         }
 874         kfree(save_encoders);
 875         return ret;
 876 }
 877 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 878
 879 bool drm_helper_plugged_event(struct drm_device *dev)
 880 {
 881         DRM_DEBUG("\n");
 882
 883         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
 884                                          dev->mode_config.max_height);
 885
 886         drm_setup_crtcs(dev);
 887
 888         /* alert the driver fb layer */
 889         dev->mode_config.funcs->fb_changed(dev);
 890
 891         /* FIXME: send hotplug event */
 892         return true;
 893 }
 894 /**
 895  * drm_initial_config - setup a sane initial connector configuration
 896  * @dev: DRM device
 897  *
 898  * LOCKING:
 899  * Called at init time, must take mode config lock.
 900  *
 901  * Scan the CRTCs and connectors and try to put together an initial setup.
 902  * At the moment, this is a cloned configuration across all heads with
 903  * a new framebuffer object as the backing store.
 904  *
 905  * RETURNS:
 906  * Zero if everything went ok, nonzero otherwise.
 907  */
 908 bool drm_helper_initial_config(struct drm_device *dev)
 909 {
 910         struct drm_connector *connector;
 911         int count = 0;
 912
 913         count = drm_helper_probe_connector_modes(dev,
 914                                                  dev->mode_config.max_width,
 915                                                  dev->mode_config.max_height);
 916
 917         /*
 918          * None of the available connectors had any modes, so add some
 919          * and try to light them up anyway
 920          */
 921         if (!count) {
 922                 DRM_ERROR("connectors have no modes, using standard modes\n");
 923                 list_for_each_entry(connector,
 924                                     &dev->mode_config.connector_list,
 925                                     head)
 926                         drm_helper_add_std_modes(dev, connector);
 927         }
 928
 929         drm_setup_crtcs(dev);
 930
 931         /* alert the driver fb layer */
 932         dev->mode_config.funcs->fb_changed(dev);
 933
 934         return 0;
 935 }
 936 EXPORT_SYMBOL(drm_helper_initial_config);
 937
 938 /**
 939  * drm_hotplug_stage_two
 940  * @dev DRM device
 941  * @connector hotpluged connector
 942  *
 943  * LOCKING.
 944  * Caller must hold mode config lock, function might grab struct lock.
 945  *
 946  * Stage two of a hotplug.
 947  *
 948  * RETURNS:
 949  * Zero on success, errno on failure.
 950  */
 951 int drm_helper_hotplug_stage_two(struct drm_device *dev)
 952 {
 953         drm_helper_plugged_event(dev);
 954
 955         return 0;
 956 }
 957 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
 958
 959 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 960                                    struct drm_mode_fb_cmd *mode_cmd)
 961 {
 962         fb->width = mode_cmd->width;
 963         fb->height = mode_cmd->height;
 964         fb->pitch = mode_cmd->pitch;
 965         fb->bits_per_pixel = mode_cmd->bpp;
 966         fb->depth = mode_cmd->depth;
 967
 968         return 0;
 969 }
 970 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 971
 972 int drm_helper_resume_force_mode(struct drm_device *dev)
 973 {
 974         struct drm_crtc *crtc;
 975         int ret;
 976
 977         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 978
 979                 if (!crtc->enabled)
 980                         continue;
 981
 982                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 983                                                crtc->x, crtc->y, crtc->fb);
 984
 985                 if (ret == false)
 986                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 987         }
 988         return 0;
 989 }
 990 EXPORT_SYMBOL(drm_helper_resume_force_mode);