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