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_KMS("%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_KMS("%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_KMS("Probed modes for %s\n",
 142                                 drm_get_connector_name(connector));
 143         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 144                 mode->vrefresh = drm_mode_vrefresh(mode);
 145
 146                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 147                 drm_mode_debug_printmodeline(mode);
 148         }
 149
 150         return count;
 151 }
 152 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 153
 154 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
 155                                       uint32_t maxY)
 156 {
 157         struct drm_connector *connector;
 158         int count = 0;
 159
 160         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 161                 count += drm_helper_probe_single_connector_modes(connector,
 162                                                                  maxX, maxY);
 163         }
 164
 165         return count;
 166 }
 167 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
 168
 169 static void drm_helper_add_std_modes(struct drm_device *dev,
 170                                      struct drm_connector *connector)
 171 {
 172         struct drm_display_mode *mode, *t;
 173         int i;
 174
 175         for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
 176                 struct drm_display_mode *stdmode;
 177
 178                 /*
 179                  * When no valid EDID modes are available we end up
 180                  * here and bailed in the past, now we add some standard
 181                  * modes and move on.
 182                  */
 183                 stdmode = drm_mode_duplicate(dev, &std_modes[i]);
 184                 drm_mode_probed_add(connector, stdmode);
 185                 drm_mode_list_concat(&connector->probed_modes,
 186                                      &connector->modes);
 187
 188                 DRM_DEBUG_KMS("Adding mode %s to %s\n", stdmode->name,
 189                           drm_get_connector_name(connector));
 190         }
 191         drm_mode_sort(&connector->modes);
 192
 193         DRM_DEBUG_KMS("Added std modes on %s\n",
 194                         drm_get_connector_name(connector));
 195         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 196                 mode->vrefresh = drm_mode_vrefresh(mode);
 197
 198                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 199                 drm_mode_debug_printmodeline(mode);
 200         }
 201 }
 202
 203 /**
 204  * drm_helper_encoder_in_use - check if a given encoder is in use
 205  * @encoder: encoder to check
 206  *
 207  * LOCKING:
 208  * Caller must hold mode config lock.
 209  *
 210  * Walk @encoders's DRM device's mode_config and see if it's in use.
 211  *
 212  * RETURNS:
 213  * True if @encoder is part of the mode_config, false otherwise.
 214  */
 215 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 216 {
 217         struct drm_connector *connector;
 218         struct drm_device *dev = encoder->dev;
 219         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 220                 if (connector->encoder == encoder)
 221                         return true;
 222         return false;
 223 }
 224 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 225
 226 /**
 227  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 228  * @crtc: CRTC to check
 229  *
 230  * LOCKING:
 231  * Caller must hold mode config lock.
 232  *
 233  * Walk @crtc's DRM device's mode_config and see if it's in use.
 234  *
 235  * RETURNS:
 236  * True if @crtc is part of the mode_config, false otherwise.
 237  */
 238 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 239 {
 240         struct drm_encoder *encoder;
 241         struct drm_device *dev = crtc->dev;
 242         /* FIXME: Locking around list access? */
 243         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 244                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 245                         return true;
 246         return false;
 247 }
 248 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 249
 250 /**
 251  * drm_disable_unused_functions - disable unused objects
 252  * @dev: DRM device
 253  *
 254  * LOCKING:
 255  * Caller must hold mode config lock.
 256  *
 257  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 258  * by calling its dpms function, which should power it off.
 259  */
 260 void drm_helper_disable_unused_functions(struct drm_device *dev)
 261 {
 262         struct drm_encoder *encoder;
 263         struct drm_encoder_helper_funcs *encoder_funcs;
 264         struct drm_crtc *crtc;
 265
 266         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 267                 encoder_funcs = encoder->helper_private;
 268                 if (!drm_helper_encoder_in_use(encoder))
 269                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 270         }
 271
 272         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 273                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 274                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 275                 if (!crtc->enabled) {
 276                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 277                         crtc->fb = NULL;
 278                 }
 279         }
 280 }
 281 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 282
 283 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 284 {
 285         struct drm_display_mode *mode;
 286
 287         list_for_each_entry(mode, &connector->modes, head) {
 288                 if (drm_mode_width(mode) > width ||
 289                     drm_mode_height(mode) > height)
 290                         continue;
 291                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 292                         return mode;
 293         }
 294         return NULL;
 295 }
 296
 297 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 298 {
 299         bool enable;
 300
 301         if (strict) {
 302                 enable = connector->status == connector_status_connected;
 303         } else {
 304                 enable = connector->status != connector_status_disconnected;
 305         }
 306         return enable;
 307 }
 308
 309 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 310 {
 311         bool any_enabled = false;
 312         struct drm_connector *connector;
 313         int i = 0;
 314
 315         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 316                 enabled[i] = drm_connector_enabled(connector, true);
 317                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
 318                           enabled[i] ? "yes" : "no");
 319                 any_enabled |= enabled[i];
 320                 i++;
 321         }
 322
 323         if (any_enabled)
 324                 return;
 325
 326         i = 0;
 327         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 328                 enabled[i] = drm_connector_enabled(connector, false);
 329                 i++;
 330         }
 331 }
 332
 333 static bool drm_target_preferred(struct drm_device *dev,
 334                                  struct drm_display_mode **modes,
 335                                  bool *enabled, int width, int height)
 336 {
 337         struct drm_connector *connector;
 338         int i = 0;
 339
 340         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 341
 342                 if (enabled[i] == false) {
 343                         i++;
 344                         continue;
 345                 }
 346
 347                 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 348                           connector->base.id);
 349
 350                 modes[i] = drm_has_preferred_mode(connector, width, height);
 351                 /* No preferred modes, pick one off the list */
 352                 if (!modes[i] && !list_empty(&connector->modes)) {
 353                         list_for_each_entry(modes[i], &connector->modes, head)
 354                                 break;
 355                 }
 356                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
 357                           "none");
 358                 i++;
 359         }
 360         return true;
 361 }
 362
 363 static int drm_pick_crtcs(struct drm_device *dev,
 364                           struct drm_crtc **best_crtcs,
 365                           struct drm_display_mode **modes,
 366                           int n, int width, int height)
 367 {
 368         int c, o;
 369         struct drm_connector *connector;
 370         struct drm_connector_helper_funcs *connector_funcs;
 371         struct drm_encoder *encoder;
 372         struct drm_crtc *best_crtc;
 373         int my_score, best_score, score;
 374         struct drm_crtc **crtcs, *crtc;
 375
 376         if (n == dev->mode_config.num_connector)
 377                 return 0;
 378         c = 0;
 379         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 380                 if (c == n)
 381                         break;
 382                 c++;
 383         }
 384
 385         best_crtcs[n] = NULL;
 386         best_crtc = NULL;
 387         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 388         if (modes[n] == NULL)
 389                 return best_score;
 390
 391         crtcs = kmalloc(dev->mode_config.num_connector *
 392                         sizeof(struct drm_crtc *), GFP_KERNEL);
 393         if (!crtcs)
 394                 return best_score;
 395
 396         my_score = 1;
 397         if (connector->status == connector_status_connected)
 398                 my_score++;
 399         if (drm_has_preferred_mode(connector, width, height))
 400                 my_score++;
 401
 402         connector_funcs = connector->helper_private;
 403         encoder = connector_funcs->best_encoder(connector);
 404         if (!encoder)
 405                 goto out;
 406
 407         connector->encoder = encoder;
 408
 409         /* select a crtc for this connector and then attempt to configure
 410            remaining connectors */
 411         c = 0;
 412         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 413
 414                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
 415                         c++;
 416                         continue;
 417                 }
 418
 419                 for (o = 0; o < n; o++)
 420                         if (best_crtcs[o] == crtc)
 421                                 break;
 422
 423                 if (o < n) {
 424                         /* ignore cloning for now */
 425                         c++;
 426                         continue;
 427                 }
 428
 429                 crtcs[n] = crtc;
 430                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 431                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
 432                                                   width, height);
 433                 if (score > best_score) {
 434                         best_crtc = crtc;
 435                         best_score = score;
 436                         memcpy(best_crtcs, crtcs,
 437                                dev->mode_config.num_connector *
 438                                sizeof(struct drm_crtc *));
 439                 }
 440                 c++;
 441         }
 442 out:
 443         kfree(crtcs);
 444         return best_score;
 445 }
 446
 447 static void drm_setup_crtcs(struct drm_device *dev)
 448 {
 449         struct drm_crtc **crtcs;
 450         struct drm_display_mode **modes;
 451         struct drm_encoder *encoder;
 452         struct drm_connector *connector;
 453         bool *enabled;
 454         int width, height;
 455         int i, ret;
 456
 457         DRM_DEBUG_KMS("\n");
 458
 459         width = dev->mode_config.max_width;
 460         height = dev->mode_config.max_height;
 461
 462         /* clean out all the encoder/crtc combos */
 463         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 464                 encoder->crtc = NULL;
 465         }
 466
 467         crtcs = kcalloc(dev->mode_config.num_connector,
 468                         sizeof(struct drm_crtc *), GFP_KERNEL);
 469         modes = kcalloc(dev->mode_config.num_connector,
 470                         sizeof(struct drm_display_mode *), GFP_KERNEL);
 471         enabled = kcalloc(dev->mode_config.num_connector,
 472                           sizeof(bool), GFP_KERNEL);
 473
 474         drm_enable_connectors(dev, enabled);
 475
 476         ret = drm_target_preferred(dev, modes, enabled, width, height);
 477         if (!ret)
 478                 DRM_ERROR("Unable to find initial modes\n");
 479
 480         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
 481
 482         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 483
 484         i = 0;
 485         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 486                 struct drm_display_mode *mode = modes[i];
 487                 struct drm_crtc *crtc = crtcs[i];
 488
 489                 if (connector->encoder == NULL) {
 490                         i++;
 491                         continue;
 492                 }
 493
 494                 if (mode && crtc) {
 495                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
 496                                   mode->name, crtc->base.id);
 497                         crtc->desired_mode = mode;
 498                         connector->encoder->crtc = crtc;
 499                 } else
 500                         connector->encoder->crtc = NULL;
 501                 i++;
 502         }
 503
 504         kfree(crtcs);
 505         kfree(modes);
 506         kfree(enabled);
 507 }
 508
 509 /**
 510  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 511  * @encoder: encoder to test
 512  * @crtc: crtc to test
 513  *
 514  * Return false if @encoder can't be driven by @crtc, true otherwise.
 515  */
 516 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 517                                 struct drm_crtc *crtc)
 518 {
 519         struct drm_device *dev;
 520         struct drm_crtc *tmp;
 521         int crtc_mask = 1;
 522
 523         WARN(!crtc, "checking null crtc?");
 524
 525         dev = crtc->dev;
 526
 527         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 528                 if (tmp == crtc)
 529                         break;
 530                 crtc_mask <<= 1;
 531         }
 532
 533         if (encoder->possible_crtcs & crtc_mask)
 534                 return true;
 535         return false;
 536 }
 537
 538 /*
 539  * Check the CRTC we're going to map each output to vs. its current
 540  * CRTC.  If they don't match, we have to disable the output and the CRTC
 541  * since the driver will have to re-route things.
 542  */
 543 static void
 544 drm_crtc_prepare_encoders(struct drm_device *dev)
 545 {
 546         struct drm_encoder_helper_funcs *encoder_funcs;
 547         struct drm_encoder *encoder;
 548
 549         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 550                 encoder_funcs = encoder->helper_private;
 551                 /* Disable unused encoders */
 552                 if (encoder->crtc == NULL)
 553                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 554                 /* Disable encoders whose CRTC is about to change */
 555                 if (encoder_funcs->get_crtc &&
 556                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 557                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 558         }
 559 }
 560
 561 /**
 562  * drm_crtc_set_mode - set a mode
 563  * @crtc: CRTC to program
 564  * @mode: mode to use
 565  * @x: width of mode
 566  * @y: height of mode
 567  *
 568  * LOCKING:
 569  * Caller must hold mode config lock.
 570  *
 571  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 572  * to fixup or reject the mode prior to trying to set it.
 573  *
 574  * RETURNS:
 575  * True if the mode was set successfully, or false otherwise.
 576  */
 577 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 578                               struct drm_display_mode *mode,
 579                               int x, int y,
 580                               struct drm_framebuffer *old_fb)
 581 {
 582         struct drm_device *dev = crtc->dev;
 583         struct drm_display_mode *adjusted_mode, saved_mode;
 584         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 585         struct drm_encoder_helper_funcs *encoder_funcs;
 586         int saved_x, saved_y;
 587         struct drm_encoder *encoder;
 588         bool ret = true;
 589
 590         adjusted_mode = drm_mode_duplicate(dev, mode);
 591
 592         crtc->enabled = drm_helper_crtc_in_use(crtc);
 593
 594         if (!crtc->enabled)
 595                 return true;
 596
 597         saved_mode = crtc->mode;
 598         saved_x = crtc->x;
 599         saved_y = crtc->y;
 600
 601         /* Update crtc values up front so the driver can rely on them for mode
 602          * setting.
 603          */
 604         crtc->mode = *mode;
 605         crtc->x = x;
 606         crtc->y = y;
 607
 608         /* Pass our mode to the connectors and the CRTC to give them a chance to
 609          * adjust it according to limitations or connector properties, and also
 610          * a chance to reject the mode entirely.
 611          */
 612         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 613
 614                 if (encoder->crtc != crtc)
 615                         continue;
 616                 encoder_funcs = encoder->helper_private;
 617                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 618                                                       adjusted_mode))) {
 619                         goto done;
 620                 }
 621         }
 622
 623         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 624                 goto done;
 625         }
 626
 627         /* Prepare the encoders and CRTCs before setting the mode. */
 628         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 629
 630                 if (encoder->crtc != crtc)
 631                         continue;
 632                 encoder_funcs = encoder->helper_private;
 633                 /* Disable the encoders as the first thing we do. */
 634                 encoder_funcs->prepare(encoder);
 635         }
 636
 637         drm_crtc_prepare_encoders(dev);
 638
 639         crtc_funcs->prepare(crtc);
 640
 641         /* Set up the DPLL and any encoders state that needs to adjust or depend
 642          * on the DPLL.
 643          */
 644         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 645         if (!ret)
 646             goto done;
 647
 648         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 649
 650                 if (encoder->crtc != crtc)
 651                         continue;
 652
 653                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 654                          mode->name, mode->base.id);
 655                 encoder_funcs = encoder->helper_private;
 656                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 657         }
 658
 659         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 660         crtc_funcs->commit(crtc);
 661
 662         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 663
 664                 if (encoder->crtc != crtc)
 665                         continue;
 666
 667                 encoder_funcs = encoder->helper_private;
 668                 encoder_funcs->commit(encoder);
 669
 670         }
 671
 672         /* XXX free adjustedmode */
 673         drm_mode_destroy(dev, adjusted_mode);
 674         /* FIXME: add subpixel order */
 675 done:
 676         if (!ret) {
 677                 crtc->mode = saved_mode;
 678                 crtc->x = saved_x;
 679                 crtc->y = saved_y;
 680         }
 681
 682         return ret;
 683 }
 684 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 685
 686
 687 /**
 688  * drm_crtc_helper_set_config - set a new config from userspace
 689  * @crtc: CRTC to setup
 690  * @crtc_info: user provided configuration
 691  * @new_mode: new mode to set
 692  * @connector_set: set of connectors for the new config
 693  * @fb: new framebuffer
 694  *
 695  * LOCKING:
 696  * Caller must hold mode config lock.
 697  *
 698  * Setup a new configuration, provided by the user in @crtc_info, and enable
 699  * it.
 700  *
 701  * RETURNS:
 702  * Zero. (FIXME)
 703  */
 704 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 705 {
 706         struct drm_device *dev;
 707         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 708         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 709         struct drm_framebuffer *old_fb = NULL;
 710         bool mode_changed = false; /* if true do a full mode set */
 711         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 712         struct drm_connector *save_connectors, *connector;
 713         int count = 0, ro, fail = 0;
 714         struct drm_crtc_helper_funcs *crtc_funcs;
 715         int ret = 0;
 716
 717         DRM_DEBUG_KMS("\n");
 718
 719         if (!set)
 720                 return -EINVAL;
 721
 722         if (!set->crtc)
 723                 return -EINVAL;
 724
 725         if (!set->crtc->helper_private)
 726                 return -EINVAL;
 727
 728         crtc_funcs = set->crtc->helper_private;
 729
 730         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
 731                         " %d (x, y) (%i, %i)\n",
 732                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 733                   (int)set->num_connectors, set->x, set->y);
 734
 735         dev = set->crtc->dev;
 736
 737         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 738          * connector data. */
 739         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 740                              sizeof(struct drm_crtc), GFP_KERNEL);
 741         if (!save_crtcs)
 742                 return -ENOMEM;
 743
 744         save_encoders = kzalloc(dev->mode_config.num_encoder *
 745                                 sizeof(struct drm_encoder), GFP_KERNEL);
 746         if (!save_encoders) {
 747                 kfree(save_crtcs);
 748                 return -ENOMEM;
 749         }
 750
 751         save_connectors = kzalloc(dev->mode_config.num_connector *
 752                                 sizeof(struct drm_connector), GFP_KERNEL);
 753         if (!save_connectors) {
 754                 kfree(save_crtcs);
 755                 kfree(save_encoders);
 756                 return -ENOMEM;
 757         }
 758
 759         /* Copy data. Note that driver private data is not affected.
 760          * Should anything bad happen only the expected state is
 761          * restored, not the drivers personal bookkeeping.
 762          */
 763         count = 0;
 764         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 765                 save_crtcs[count++] = *crtc;
 766         }
 767
 768         count = 0;
 769         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 770                 save_encoders[count++] = *encoder;
 771         }
 772
 773         count = 0;
 774         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 775                 save_connectors[count++] = *connector;
 776         }
 777
 778         /* We should be able to check here if the fb has the same properties
 779          * and then just flip_or_move it */
 780         if (set->crtc->fb != set->fb) {
 781                 /* If we have no fb then treat it as a full mode set */
 782                 if (set->crtc->fb == NULL) {
 783                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 784                         mode_changed = true;
 785                 } else if (set->fb == NULL) {
 786                         mode_changed = true;
 787                 } else if ((set->fb->bits_per_pixel !=
 788                          set->crtc->fb->bits_per_pixel) ||
 789                          set->fb->depth != set->crtc->fb->depth)
 790                         fb_changed = true;
 791                 else
 792                         fb_changed = true;
 793         }
 794
 795         if (set->x != set->crtc->x || set->y != set->crtc->y)
 796                 fb_changed = true;
 797
 798         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 799                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 800                 drm_mode_debug_printmodeline(&set->crtc->mode);
 801                 drm_mode_debug_printmodeline(set->mode);
 802                 mode_changed = true;
 803         }
 804
 805         /* a) traverse passed in connector list and get encoders for them */
 806         count = 0;
 807         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 808                 struct drm_connector_helper_funcs *connector_funcs =
 809                         connector->helper_private;
 810                 new_encoder = connector->encoder;
 811                 for (ro = 0; ro < set->num_connectors; ro++) {
 812                         if (set->connectors[ro] == connector) {
 813                                 new_encoder = connector_funcs->best_encoder(connector);
 814                                 /* if we can't get an encoder for a connector
 815                                    we are setting now - then fail */
 816                                 if (new_encoder == NULL)
 817                                         /* don't break so fail path works correct */
 818                                         fail = 1;
 819                                 break;
 820                         }
 821                 }
 822
 823                 if (new_encoder != connector->encoder) {
 824                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 825                         mode_changed = true;
 826                         /* If the encoder is reused for another connector, then
 827                          * the appropriate crtc will be set later.
 828                          */
 829                         connector->encoder->crtc = NULL;
 830                         connector->encoder = new_encoder;
 831                 }
 832         }
 833
 834         if (fail) {
 835                 ret = -EINVAL;
 836                 goto fail;
 837         }
 838
 839         count = 0;
 840         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 841                 if (!connector->encoder)
 842                         continue;
 843
 844                 if (connector->encoder->crtc == set->crtc)
 845                         new_crtc = NULL;
 846                 else
 847                         new_crtc = connector->encoder->crtc;
 848
 849                 for (ro = 0; ro < set->num_connectors; ro++) {
 850                         if (set->connectors[ro] == connector)
 851                                 new_crtc = set->crtc;
 852                 }
 853
 854                 /* Make sure the new CRTC will work with the encoder */
 855                 if (new_crtc &&
 856                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 857                         ret = -EINVAL;
 858                         goto fail;
 859                 }
 860                 if (new_crtc != connector->encoder->crtc) {
 861                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 862                         mode_changed = true;
 863                         connector->encoder->crtc = new_crtc;
 864                 }
 865                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
 866                           connector->base.id, new_crtc);
 867         }
 868
 869         /* mode_set_base is not a required function */
 870         if (fb_changed && !crtc_funcs->mode_set_base)
 871                 mode_changed = true;
 872
 873         if (mode_changed) {
 874                 old_fb = set->crtc->fb;
 875                 set->crtc->fb = set->fb;
 876                 set->crtc->enabled = (set->mode != NULL);
 877                 if (set->mode != NULL) {
 878                         DRM_DEBUG_KMS("attempting to set mode from"
 879                                         " userspace\n");
 880                         drm_mode_debug_printmodeline(set->mode);
 881                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 882                                                       set->x, set->y,
 883                                                       old_fb)) {
 884                                 DRM_ERROR("failed to set mode on crtc %p\n",
 885                                           set->crtc);
 886                                 ret = -EINVAL;
 887                                 goto fail;
 888                         }
 889                         /* TODO are these needed? */
 890                         set->crtc->desired_x = set->x;
 891                         set->crtc->desired_y = set->y;
 892                         set->crtc->desired_mode = set->mode;
 893                 }
 894                 drm_helper_disable_unused_functions(dev);
 895         } else if (fb_changed) {
 896                 old_fb = set->crtc->fb;
 897                 if (set->crtc->fb != set->fb)
 898                         set->crtc->fb = set->fb;
 899                 ret = crtc_funcs->mode_set_base(set->crtc,
 900                                                 set->x, set->y, old_fb);
 901                 if (ret != 0)
 902                         goto fail;
 903         }
 904
 905         kfree(save_connectors);
 906         kfree(save_encoders);
 907         kfree(save_crtcs);
 908         return 0;
 909
 910 fail:
 911         /* Restore all previous data. */
 912         count = 0;
 913         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 914                 *crtc = save_crtcs[count++];
 915         }
 916
 917         count = 0;
 918         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 919                 *encoder = save_encoders[count++];
 920         }
 921
 922         count = 0;
 923         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 924                 *connector = save_connectors[count++];
 925         }
 926
 927         kfree(save_connectors);
 928         kfree(save_encoders);
 929         kfree(save_crtcs);
 930         return ret;
 931 }
 932 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 933
 934 bool drm_helper_plugged_event(struct drm_device *dev)
 935 {
 936         DRM_DEBUG_KMS("\n");
 937
 938         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
 939                                          dev->mode_config.max_height);
 940
 941         drm_setup_crtcs(dev);
 942
 943         /* alert the driver fb layer */
 944         dev->mode_config.funcs->fb_changed(dev);
 945
 946         /* FIXME: send hotplug event */
 947         return true;
 948 }
 949 /**
 950  * drm_initial_config - setup a sane initial connector configuration
 951  * @dev: DRM device
 952  *
 953  * LOCKING:
 954  * Called at init time, must take mode config lock.
 955  *
 956  * Scan the CRTCs and connectors and try to put together an initial setup.
 957  * At the moment, this is a cloned configuration across all heads with
 958  * a new framebuffer object as the backing store.
 959  *
 960  * RETURNS:
 961  * Zero if everything went ok, nonzero otherwise.
 962  */
 963 bool drm_helper_initial_config(struct drm_device *dev)
 964 {
 965         struct drm_connector *connector;
 966         int count = 0;
 967
 968         count = drm_helper_probe_connector_modes(dev,
 969                                                  dev->mode_config.max_width,
 970                                                  dev->mode_config.max_height);
 971
 972         /*
 973          * None of the available connectors had any modes, so add some
 974          * and try to light them up anyway
 975          */
 976         if (!count) {
 977                 DRM_ERROR("connectors have no modes, using standard modes\n");
 978                 list_for_each_entry(connector,
 979                                     &dev->mode_config.connector_list,
 980                                     head)
 981                         drm_helper_add_std_modes(dev, connector);
 982         }
 983
 984         drm_setup_crtcs(dev);
 985
 986         /* alert the driver fb layer */
 987         dev->mode_config.funcs->fb_changed(dev);
 988
 989         return 0;
 990 }
 991 EXPORT_SYMBOL(drm_helper_initial_config);
 992
 993 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 994 {
 995         int dpms = DRM_MODE_DPMS_OFF;
 996         struct drm_connector *connector;
 997         struct drm_device *dev = encoder->dev;
 998
 999         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1000                 if (connector->encoder == encoder)
1001                         if (connector->dpms < dpms)
1002                                 dpms = connector->dpms;
1003         return dpms;
1004 }
1005
1006 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
1007 {
1008         int dpms = DRM_MODE_DPMS_OFF;
1009         struct drm_connector *connector;
1010         struct drm_device *dev = crtc->dev;
1011
1012         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1013                 if (connector->encoder && connector->encoder->crtc == crtc)
1014                         if (connector->dpms < dpms)
1015                                 dpms = connector->dpms;
1016         return dpms;
1017 }
1018
1019 /**
1020  * drm_helper_connector_dpms
1021  * @connector affected connector
1022  * @mode DPMS mode
1023  *
1024  * Calls the low-level connector DPMS function, then
1025  * calls appropriate encoder and crtc DPMS functions as well
1026  */
1027 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
1028 {
1029         struct drm_encoder *encoder = connector->encoder;
1030         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
1031         int old_dpms;
1032
1033         if (mode == connector->dpms)
1034                 return;
1035
1036         old_dpms = connector->dpms;
1037         connector->dpms = mode;
1038
1039         /* from off to on, do crtc then encoder */
1040         if (mode < old_dpms) {
1041                 if (crtc) {
1042                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1043                         if (crtc_funcs->dpms)
1044                                 (*crtc_funcs->dpms) (crtc,
1045                                                      drm_helper_choose_crtc_dpms(crtc));
1046                 }
1047                 if (encoder) {
1048                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1049                         if (encoder_funcs->dpms)
1050                                 (*encoder_funcs->dpms) (encoder,
1051                                                         drm_helper_choose_encoder_dpms(encoder));
1052                 }
1053         }
1054
1055         /* from on to off, do encoder then crtc */
1056         if (mode > old_dpms) {
1057                 if (encoder) {
1058                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1059                         if (encoder_funcs->dpms)
1060                                 (*encoder_funcs->dpms) (encoder,
1061                                                         drm_helper_choose_encoder_dpms(encoder));
1062                 }
1063                 if (crtc) {
1064                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1065                         if (crtc_funcs->dpms)
1066                                 (*crtc_funcs->dpms) (crtc,
1067                                                      drm_helper_choose_crtc_dpms(crtc));
1068                 }
1069         }
1070
1071         return;
1072 }
1073 EXPORT_SYMBOL(drm_helper_connector_dpms);
1074
1075 /**
1076  * drm_hotplug_stage_two
1077  * @dev DRM device
1078  * @connector hotpluged connector
1079  *
1080  * LOCKING.
1081  * Caller must hold mode config lock, function might grab struct lock.
1082  *
1083  * Stage two of a hotplug.
1084  *
1085  * RETURNS:
1086  * Zero on success, errno on failure.
1087  */
1088 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1089 {
1090         drm_helper_plugged_event(dev);
1091
1092         return 0;
1093 }
1094 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1095
1096 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1097                                    struct drm_mode_fb_cmd *mode_cmd)
1098 {
1099         fb->width = mode_cmd->width;
1100         fb->height = mode_cmd->height;
1101         fb->pitch = mode_cmd->pitch;
1102         fb->bits_per_pixel = mode_cmd->bpp;
1103         fb->depth = mode_cmd->depth;
1104
1105         return 0;
1106 }
1107 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1108
1109 int drm_helper_resume_force_mode(struct drm_device *dev)
1110 {
1111         struct drm_crtc *crtc;
1112         int ret;
1113
1114         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1115
1116                 if (!crtc->enabled)
1117                         continue;
1118
1119                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1120                                                crtc->x, crtc->y, crtc->fb);
1121
1122                 if (ret == false)
1123                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1124         }
1125         /* disable the unused connectors while restoring the modesetting */
1126         drm_helper_disable_unused_functions(dev);
1127         return 0;
1128 }
1129 EXPORT_SYMBOL(drm_helper_resume_force_mode);