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_connector *connector;
 264         struct drm_encoder_helper_funcs *encoder_funcs;
 265         struct drm_crtc *crtc;
 266
 267         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 268                 if (!connector->encoder)
 269                         continue;
 270                 if (connector->status == connector_status_disconnected)
 271                         connector->encoder = NULL;
 272         }
 273
 274         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 275                 encoder_funcs = encoder->helper_private;
 276                 if (!drm_helper_encoder_in_use(encoder)) {
 277                         if (encoder_funcs->disable)
 278                                 (*encoder_funcs->disable)(encoder);
 279                         else
 280                                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 281                 }
 282                 /* disconnector encoder from any connector */
 283                 encoder->crtc = NULL;
 284         }
 285
 286         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 287                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 288                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 289                 if (!crtc->enabled) {
 290                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 291                         crtc->fb = NULL;
 292                 }
 293         }
 294 }
 295 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 296
 297 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 298 {
 299         struct drm_display_mode *mode;
 300
 301         list_for_each_entry(mode, &connector->modes, head) {
 302                 if (drm_mode_width(mode) > width ||
 303                     drm_mode_height(mode) > height)
 304                         continue;
 305                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 306                         return mode;
 307         }
 308         return NULL;
 309 }
 310
 311 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 312 {
 313         bool enable;
 314
 315         if (strict) {
 316                 enable = connector->status == connector_status_connected;
 317         } else {
 318                 enable = connector->status != connector_status_disconnected;
 319         }
 320         return enable;
 321 }
 322
 323 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 324 {
 325         bool any_enabled = false;
 326         struct drm_connector *connector;
 327         int i = 0;
 328
 329         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 330                 enabled[i] = drm_connector_enabled(connector, true);
 331                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
 332                           enabled[i] ? "yes" : "no");
 333                 any_enabled |= enabled[i];
 334                 i++;
 335         }
 336
 337         if (any_enabled)
 338                 return;
 339
 340         i = 0;
 341         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 342                 enabled[i] = drm_connector_enabled(connector, false);
 343                 i++;
 344         }
 345 }
 346
 347 static bool drm_target_preferred(struct drm_device *dev,
 348                                  struct drm_display_mode **modes,
 349                                  bool *enabled, int width, int height)
 350 {
 351         struct drm_connector *connector;
 352         int i = 0;
 353
 354         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 355
 356                 if (enabled[i] == false) {
 357                         i++;
 358                         continue;
 359                 }
 360
 361                 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 362                           connector->base.id);
 363
 364                 modes[i] = drm_has_preferred_mode(connector, width, height);
 365                 /* No preferred modes, pick one off the list */
 366                 if (!modes[i] && !list_empty(&connector->modes)) {
 367                         list_for_each_entry(modes[i], &connector->modes, head)
 368                                 break;
 369                 }
 370                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
 371                           "none");
 372                 i++;
 373         }
 374         return true;
 375 }
 376
 377 static int drm_pick_crtcs(struct drm_device *dev,
 378                           struct drm_crtc **best_crtcs,
 379                           struct drm_display_mode **modes,
 380                           int n, int width, int height)
 381 {
 382         int c, o;
 383         struct drm_connector *connector;
 384         struct drm_connector_helper_funcs *connector_funcs;
 385         struct drm_encoder *encoder;
 386         struct drm_crtc *best_crtc;
 387         int my_score, best_score, score;
 388         struct drm_crtc **crtcs, *crtc;
 389
 390         if (n == dev->mode_config.num_connector)
 391                 return 0;
 392         c = 0;
 393         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 394                 if (c == n)
 395                         break;
 396                 c++;
 397         }
 398
 399         best_crtcs[n] = NULL;
 400         best_crtc = NULL;
 401         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 402         if (modes[n] == NULL)
 403                 return best_score;
 404
 405         crtcs = kmalloc(dev->mode_config.num_connector *
 406                         sizeof(struct drm_crtc *), GFP_KERNEL);
 407         if (!crtcs)
 408                 return best_score;
 409
 410         my_score = 1;
 411         if (connector->status == connector_status_connected)
 412                 my_score++;
 413         if (drm_has_preferred_mode(connector, width, height))
 414                 my_score++;
 415
 416         connector_funcs = connector->helper_private;
 417         encoder = connector_funcs->best_encoder(connector);
 418         if (!encoder)
 419                 goto out;
 420
 421         connector->encoder = encoder;
 422
 423         /* select a crtc for this connector and then attempt to configure
 424            remaining connectors */
 425         c = 0;
 426         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 427
 428                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
 429                         c++;
 430                         continue;
 431                 }
 432
 433                 for (o = 0; o < n; o++)
 434                         if (best_crtcs[o] == crtc)
 435                                 break;
 436
 437                 if (o < n) {
 438                         /* ignore cloning for now */
 439                         c++;
 440                         continue;
 441                 }
 442
 443                 crtcs[n] = crtc;
 444                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 445                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
 446                                                   width, height);
 447                 if (score > best_score) {
 448                         best_crtc = crtc;
 449                         best_score = score;
 450                         memcpy(best_crtcs, crtcs,
 451                                dev->mode_config.num_connector *
 452                                sizeof(struct drm_crtc *));
 453                 }
 454                 c++;
 455         }
 456 out:
 457         kfree(crtcs);
 458         return best_score;
 459 }
 460
 461 static void drm_setup_crtcs(struct drm_device *dev)
 462 {
 463         struct drm_crtc **crtcs;
 464         struct drm_display_mode **modes;
 465         struct drm_encoder *encoder;
 466         struct drm_connector *connector;
 467         bool *enabled;
 468         int width, height;
 469         int i, ret;
 470
 471         DRM_DEBUG_KMS("\n");
 472
 473         width = dev->mode_config.max_width;
 474         height = dev->mode_config.max_height;
 475
 476         /* clean out all the encoder/crtc combos */
 477         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 478                 encoder->crtc = NULL;
 479         }
 480
 481         crtcs = kcalloc(dev->mode_config.num_connector,
 482                         sizeof(struct drm_crtc *), GFP_KERNEL);
 483         modes = kcalloc(dev->mode_config.num_connector,
 484                         sizeof(struct drm_display_mode *), GFP_KERNEL);
 485         enabled = kcalloc(dev->mode_config.num_connector,
 486                           sizeof(bool), GFP_KERNEL);
 487
 488         drm_enable_connectors(dev, enabled);
 489
 490         ret = drm_target_preferred(dev, modes, enabled, width, height);
 491         if (!ret)
 492                 DRM_ERROR("Unable to find initial modes\n");
 493
 494         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
 495
 496         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 497
 498         i = 0;
 499         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 500                 struct drm_display_mode *mode = modes[i];
 501                 struct drm_crtc *crtc = crtcs[i];
 502
 503                 if (connector->encoder == NULL) {
 504                         i++;
 505                         continue;
 506                 }
 507
 508                 if (mode && crtc) {
 509                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
 510                                   mode->name, crtc->base.id);
 511                         crtc->desired_mode = mode;
 512                         connector->encoder->crtc = crtc;
 513                 } else {
 514                         connector->encoder->crtc = NULL;
 515                         connector->encoder = NULL;
 516                 }
 517                 i++;
 518         }
 519
 520         kfree(crtcs);
 521         kfree(modes);
 522         kfree(enabled);
 523 }
 524
 525 /**
 526  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 527  * @encoder: encoder to test
 528  * @crtc: crtc to test
 529  *
 530  * Return false if @encoder can't be driven by @crtc, true otherwise.
 531  */
 532 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 533                                 struct drm_crtc *crtc)
 534 {
 535         struct drm_device *dev;
 536         struct drm_crtc *tmp;
 537         int crtc_mask = 1;
 538
 539         WARN(!crtc, "checking null crtc?");
 540
 541         dev = crtc->dev;
 542
 543         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 544                 if (tmp == crtc)
 545                         break;
 546                 crtc_mask <<= 1;
 547         }
 548
 549         if (encoder->possible_crtcs & crtc_mask)
 550                 return true;
 551         return false;
 552 }
 553
 554 /*
 555  * Check the CRTC we're going to map each output to vs. its current
 556  * CRTC.  If they don't match, we have to disable the output and the CRTC
 557  * since the driver will have to re-route things.
 558  */
 559 static void
 560 drm_crtc_prepare_encoders(struct drm_device *dev)
 561 {
 562         struct drm_encoder_helper_funcs *encoder_funcs;
 563         struct drm_encoder *encoder;
 564
 565         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 566                 encoder_funcs = encoder->helper_private;
 567                 /* Disable unused encoders */
 568                 if (encoder->crtc == NULL)
 569                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 570                 /* Disable encoders whose CRTC is about to change */
 571                 if (encoder_funcs->get_crtc &&
 572                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 573                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 574         }
 575 }
 576
 577 /**
 578  * drm_crtc_set_mode - set a mode
 579  * @crtc: CRTC to program
 580  * @mode: mode to use
 581  * @x: width of mode
 582  * @y: height of mode
 583  *
 584  * LOCKING:
 585  * Caller must hold mode config lock.
 586  *
 587  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 588  * to fixup or reject the mode prior to trying to set it.
 589  *
 590  * RETURNS:
 591  * True if the mode was set successfully, or false otherwise.
 592  */
 593 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 594                               struct drm_display_mode *mode,
 595                               int x, int y,
 596                               struct drm_framebuffer *old_fb)
 597 {
 598         struct drm_device *dev = crtc->dev;
 599         struct drm_display_mode *adjusted_mode, saved_mode;
 600         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 601         struct drm_encoder_helper_funcs *encoder_funcs;
 602         int saved_x, saved_y;
 603         struct drm_encoder *encoder;
 604         bool ret = true;
 605
 606         adjusted_mode = drm_mode_duplicate(dev, mode);
 607
 608         crtc->enabled = drm_helper_crtc_in_use(crtc);
 609
 610         if (!crtc->enabled)
 611                 return true;
 612
 613         saved_mode = crtc->mode;
 614         saved_x = crtc->x;
 615         saved_y = crtc->y;
 616
 617         /* Update crtc values up front so the driver can rely on them for mode
 618          * setting.
 619          */
 620         crtc->mode = *mode;
 621         crtc->x = x;
 622         crtc->y = y;
 623
 624         /* Pass our mode to the connectors and the CRTC to give them a chance to
 625          * adjust it according to limitations or connector properties, and also
 626          * a chance to reject the mode entirely.
 627          */
 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                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 634                                                       adjusted_mode))) {
 635                         goto done;
 636                 }
 637         }
 638
 639         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 640                 goto done;
 641         }
 642
 643         /* Prepare the encoders and CRTCs before setting the mode. */
 644         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 645
 646                 if (encoder->crtc != crtc)
 647                         continue;
 648                 encoder_funcs = encoder->helper_private;
 649                 /* Disable the encoders as the first thing we do. */
 650                 encoder_funcs->prepare(encoder);
 651         }
 652
 653         drm_crtc_prepare_encoders(dev);
 654
 655         crtc_funcs->prepare(crtc);
 656
 657         /* Set up the DPLL and any encoders state that needs to adjust or depend
 658          * on the DPLL.
 659          */
 660         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 661         if (!ret)
 662             goto done;
 663
 664         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 665
 666                 if (encoder->crtc != crtc)
 667                         continue;
 668
 669                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 670                          mode->name, mode->base.id);
 671                 encoder_funcs = encoder->helper_private;
 672                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 673         }
 674
 675         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 676         crtc_funcs->commit(crtc);
 677
 678         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 679
 680                 if (encoder->crtc != crtc)
 681                         continue;
 682
 683                 encoder_funcs = encoder->helper_private;
 684                 encoder_funcs->commit(encoder);
 685
 686         }
 687
 688         /* XXX free adjustedmode */
 689         drm_mode_destroy(dev, adjusted_mode);
 690         /* FIXME: add subpixel order */
 691 done:
 692         if (!ret) {
 693                 crtc->mode = saved_mode;
 694                 crtc->x = saved_x;
 695                 crtc->y = saved_y;
 696         }
 697
 698         return ret;
 699 }
 700 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 701
 702
 703 /**
 704  * drm_crtc_helper_set_config - set a new config from userspace
 705  * @crtc: CRTC to setup
 706  * @crtc_info: user provided configuration
 707  * @new_mode: new mode to set
 708  * @connector_set: set of connectors for the new config
 709  * @fb: new framebuffer
 710  *
 711  * LOCKING:
 712  * Caller must hold mode config lock.
 713  *
 714  * Setup a new configuration, provided by the user in @crtc_info, and enable
 715  * it.
 716  *
 717  * RETURNS:
 718  * Zero. (FIXME)
 719  */
 720 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 721 {
 722         struct drm_device *dev;
 723         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 724         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 725         struct drm_framebuffer *old_fb = NULL;
 726         bool mode_changed = false; /* if true do a full mode set */
 727         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 728         struct drm_connector *save_connectors, *connector;
 729         int count = 0, ro, fail = 0;
 730         struct drm_crtc_helper_funcs *crtc_funcs;
 731         int ret = 0;
 732
 733         DRM_DEBUG_KMS("\n");
 734
 735         if (!set)
 736                 return -EINVAL;
 737
 738         if (!set->crtc)
 739                 return -EINVAL;
 740
 741         if (!set->crtc->helper_private)
 742                 return -EINVAL;
 743
 744         crtc_funcs = set->crtc->helper_private;
 745
 746         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
 747                         " %d (x, y) (%i, %i)\n",
 748                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 749                   (int)set->num_connectors, set->x, set->y);
 750
 751         dev = set->crtc->dev;
 752
 753         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 754          * connector data. */
 755         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 756                              sizeof(struct drm_crtc), GFP_KERNEL);
 757         if (!save_crtcs)
 758                 return -ENOMEM;
 759
 760         save_encoders = kzalloc(dev->mode_config.num_encoder *
 761                                 sizeof(struct drm_encoder), GFP_KERNEL);
 762         if (!save_encoders) {
 763                 kfree(save_crtcs);
 764                 return -ENOMEM;
 765         }
 766
 767         save_connectors = kzalloc(dev->mode_config.num_connector *
 768                                 sizeof(struct drm_connector), GFP_KERNEL);
 769         if (!save_connectors) {
 770                 kfree(save_crtcs);
 771                 kfree(save_encoders);
 772                 return -ENOMEM;
 773         }
 774
 775         /* Copy data. Note that driver private data is not affected.
 776          * Should anything bad happen only the expected state is
 777          * restored, not the drivers personal bookkeeping.
 778          */
 779         count = 0;
 780         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 781                 save_crtcs[count++] = *crtc;
 782         }
 783
 784         count = 0;
 785         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 786                 save_encoders[count++] = *encoder;
 787         }
 788
 789         count = 0;
 790         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 791                 save_connectors[count++] = *connector;
 792         }
 793
 794         /* We should be able to check here if the fb has the same properties
 795          * and then just flip_or_move it */
 796         if (set->crtc->fb != set->fb) {
 797                 /* If we have no fb then treat it as a full mode set */
 798                 if (set->crtc->fb == NULL) {
 799                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 800                         mode_changed = true;
 801                 } else if (set->fb == NULL) {
 802                         mode_changed = true;
 803                 } else if ((set->fb->bits_per_pixel !=
 804                          set->crtc->fb->bits_per_pixel) ||
 805                          set->fb->depth != set->crtc->fb->depth)
 806                         fb_changed = true;
 807                 else
 808                         fb_changed = true;
 809         }
 810
 811         if (set->x != set->crtc->x || set->y != set->crtc->y)
 812                 fb_changed = true;
 813
 814         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 815                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 816                 drm_mode_debug_printmodeline(&set->crtc->mode);
 817                 drm_mode_debug_printmodeline(set->mode);
 818                 mode_changed = true;
 819         }
 820
 821         /* a) traverse passed in connector list and get encoders for them */
 822         count = 0;
 823         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 824                 struct drm_connector_helper_funcs *connector_funcs =
 825                         connector->helper_private;
 826                 new_encoder = connector->encoder;
 827                 for (ro = 0; ro < set->num_connectors; ro++) {
 828                         if (set->connectors[ro] == connector) {
 829                                 new_encoder = connector_funcs->best_encoder(connector);
 830                                 /* if we can't get an encoder for a connector
 831                                    we are setting now - then fail */
 832                                 if (new_encoder == NULL)
 833                                         /* don't break so fail path works correct */
 834                                         fail = 1;
 835                                 break;
 836                         }
 837                 }
 838
 839                 if (new_encoder != connector->encoder) {
 840                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 841                         mode_changed = true;
 842                         /* If the encoder is reused for another connector, then
 843                          * the appropriate crtc will be set later.
 844                          */
 845                         connector->encoder->crtc = NULL;
 846                         connector->encoder = new_encoder;
 847                 }
 848         }
 849
 850         if (fail) {
 851                 ret = -EINVAL;
 852                 goto fail;
 853         }
 854
 855         count = 0;
 856         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 857                 if (!connector->encoder)
 858                         continue;
 859
 860                 if (connector->encoder->crtc == set->crtc)
 861                         new_crtc = NULL;
 862                 else
 863                         new_crtc = connector->encoder->crtc;
 864
 865                 for (ro = 0; ro < set->num_connectors; ro++) {
 866                         if (set->connectors[ro] == connector)
 867                                 new_crtc = set->crtc;
 868                 }
 869
 870                 /* Make sure the new CRTC will work with the encoder */
 871                 if (new_crtc &&
 872                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 873                         ret = -EINVAL;
 874                         goto fail;
 875                 }
 876                 if (new_crtc != connector->encoder->crtc) {
 877                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 878                         mode_changed = true;
 879                         connector->encoder->crtc = new_crtc;
 880                 }
 881                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
 882                           connector->base.id, new_crtc);
 883         }
 884
 885         /* mode_set_base is not a required function */
 886         if (fb_changed && !crtc_funcs->mode_set_base)
 887                 mode_changed = true;
 888
 889         if (mode_changed) {
 890                 old_fb = set->crtc->fb;
 891                 set->crtc->fb = set->fb;
 892                 set->crtc->enabled = (set->mode != NULL);
 893                 if (set->mode != NULL) {
 894                         DRM_DEBUG_KMS("attempting to set mode from"
 895                                         " userspace\n");
 896                         drm_mode_debug_printmodeline(set->mode);
 897                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 898                                                       set->x, set->y,
 899                                                       old_fb)) {
 900                                 DRM_ERROR("failed to set mode on crtc %p\n",
 901                                           set->crtc);
 902                                 ret = -EINVAL;
 903                                 goto fail;
 904                         }
 905                         /* TODO are these needed? */
 906                         set->crtc->desired_x = set->x;
 907                         set->crtc->desired_y = set->y;
 908                         set->crtc->desired_mode = set->mode;
 909                 }
 910                 drm_helper_disable_unused_functions(dev);
 911         } else if (fb_changed) {
 912                 old_fb = set->crtc->fb;
 913                 if (set->crtc->fb != set->fb)
 914                         set->crtc->fb = set->fb;
 915                 ret = crtc_funcs->mode_set_base(set->crtc,
 916                                                 set->x, set->y, old_fb);
 917                 if (ret != 0)
 918                         goto fail;
 919         }
 920
 921         kfree(save_connectors);
 922         kfree(save_encoders);
 923         kfree(save_crtcs);
 924         return 0;
 925
 926 fail:
 927         /* Restore all previous data. */
 928         count = 0;
 929         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 930                 *crtc = save_crtcs[count++];
 931         }
 932
 933         count = 0;
 934         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 935                 *encoder = save_encoders[count++];
 936         }
 937
 938         count = 0;
 939         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 940                 *connector = save_connectors[count++];
 941         }
 942
 943         kfree(save_connectors);
 944         kfree(save_encoders);
 945         kfree(save_crtcs);
 946         return ret;
 947 }
 948 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 949
 950 bool drm_helper_plugged_event(struct drm_device *dev)
 951 {
 952         DRM_DEBUG_KMS("\n");
 953
 954         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
 955                                          dev->mode_config.max_height);
 956
 957         drm_setup_crtcs(dev);
 958
 959         /* alert the driver fb layer */
 960         dev->mode_config.funcs->fb_changed(dev);
 961
 962         /* FIXME: send hotplug event */
 963         return true;
 964 }
 965 /**
 966  * drm_initial_config - setup a sane initial connector configuration
 967  * @dev: DRM device
 968  *
 969  * LOCKING:
 970  * Called at init time, must take mode config lock.
 971  *
 972  * Scan the CRTCs and connectors and try to put together an initial setup.
 973  * At the moment, this is a cloned configuration across all heads with
 974  * a new framebuffer object as the backing store.
 975  *
 976  * RETURNS:
 977  * Zero if everything went ok, nonzero otherwise.
 978  */
 979 bool drm_helper_initial_config(struct drm_device *dev)
 980 {
 981         struct drm_connector *connector;
 982         int count = 0;
 983
 984         count = drm_helper_probe_connector_modes(dev,
 985                                                  dev->mode_config.max_width,
 986                                                  dev->mode_config.max_height);
 987
 988         /*
 989          * None of the available connectors had any modes, so add some
 990          * and try to light them up anyway
 991          */
 992         if (!count) {
 993                 DRM_ERROR("connectors have no modes, using standard modes\n");
 994                 list_for_each_entry(connector,
 995                                     &dev->mode_config.connector_list,
 996                                     head)
 997                         drm_helper_add_std_modes(dev, connector);
 998         }
 999
1000         drm_setup_crtcs(dev);
1001
1002         /* alert the driver fb layer */
1003         dev->mode_config.funcs->fb_changed(dev);
1004
1005         return 0;
1006 }
1007 EXPORT_SYMBOL(drm_helper_initial_config);
1008
1009 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
1010 {
1011         int dpms = DRM_MODE_DPMS_OFF;
1012         struct drm_connector *connector;
1013         struct drm_device *dev = encoder->dev;
1014
1015         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1016                 if (connector->encoder == encoder)
1017                         if (connector->dpms < dpms)
1018                                 dpms = connector->dpms;
1019         return dpms;
1020 }
1021
1022 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
1023 {
1024         int dpms = DRM_MODE_DPMS_OFF;
1025         struct drm_connector *connector;
1026         struct drm_device *dev = crtc->dev;
1027
1028         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1029                 if (connector->encoder && connector->encoder->crtc == crtc)
1030                         if (connector->dpms < dpms)
1031                                 dpms = connector->dpms;
1032         return dpms;
1033 }
1034
1035 /**
1036  * drm_helper_connector_dpms
1037  * @connector affected connector
1038  * @mode DPMS mode
1039  *
1040  * Calls the low-level connector DPMS function, then
1041  * calls appropriate encoder and crtc DPMS functions as well
1042  */
1043 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
1044 {
1045         struct drm_encoder *encoder = connector->encoder;
1046         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
1047         int old_dpms;
1048
1049         if (mode == connector->dpms)
1050                 return;
1051
1052         old_dpms = connector->dpms;
1053         connector->dpms = mode;
1054
1055         /* from off to on, do crtc then encoder */
1056         if (mode < old_dpms) {
1057                 if (crtc) {
1058                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1059                         if (crtc_funcs->dpms)
1060                                 (*crtc_funcs->dpms) (crtc,
1061                                                      drm_helper_choose_crtc_dpms(crtc));
1062                 }
1063                 if (encoder) {
1064                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1065                         if (encoder_funcs->dpms)
1066                                 (*encoder_funcs->dpms) (encoder,
1067                                                         drm_helper_choose_encoder_dpms(encoder));
1068                 }
1069         }
1070
1071         /* from on to off, do encoder then crtc */
1072         if (mode > old_dpms) {
1073                 if (encoder) {
1074                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1075                         if (encoder_funcs->dpms)
1076                                 (*encoder_funcs->dpms) (encoder,
1077                                                         drm_helper_choose_encoder_dpms(encoder));
1078                 }
1079                 if (crtc) {
1080                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1081                         if (crtc_funcs->dpms)
1082                                 (*crtc_funcs->dpms) (crtc,
1083                                                      drm_helper_choose_crtc_dpms(crtc));
1084                 }
1085         }
1086
1087         return;
1088 }
1089 EXPORT_SYMBOL(drm_helper_connector_dpms);
1090
1091 /**
1092  * drm_hotplug_stage_two
1093  * @dev DRM device
1094  * @connector hotpluged connector
1095  *
1096  * LOCKING.
1097  * Caller must hold mode config lock, function might grab struct lock.
1098  *
1099  * Stage two of a hotplug.
1100  *
1101  * RETURNS:
1102  * Zero on success, errno on failure.
1103  */
1104 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1105 {
1106         drm_helper_plugged_event(dev);
1107
1108         return 0;
1109 }
1110 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1111
1112 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1113                                    struct drm_mode_fb_cmd *mode_cmd)
1114 {
1115         fb->width = mode_cmd->width;
1116         fb->height = mode_cmd->height;
1117         fb->pitch = mode_cmd->pitch;
1118         fb->bits_per_pixel = mode_cmd->bpp;
1119         fb->depth = mode_cmd->depth;
1120
1121         return 0;
1122 }
1123 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1124
1125 int drm_helper_resume_force_mode(struct drm_device *dev)
1126 {
1127         struct drm_crtc *crtc;
1128         int ret;
1129
1130         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1131
1132                 if (!crtc->enabled)
1133                         continue;
1134
1135                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1136                                                crtc->x, crtc->y, crtc->fb);
1137
1138                 if (ret == false)
1139                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1140         }
1141         /* disable the unused connectors while restoring the modesetting */
1142         drm_helper_disable_unused_functions(dev);
1143         return 0;
1144 }
1145 EXPORT_SYMBOL(drm_helper_resume_force_mode);