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 #include "drm_fb_helper.h"
  36
  37 static void drm_mode_validate_flag(struct drm_connector *connector,
  38                                    int flags)
  39 {
  40         struct drm_display_mode *mode, *t;
  41
  42         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  43                 return;
  44
  45         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  46                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  47                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  48                         mode->status = MODE_NO_INTERLACE;
  49                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  50                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  51                         mode->status = MODE_NO_DBLESCAN;
  52         }
  53
  54         return;
  55 }
  56
  57 /**
  58  * drm_helper_probe_connector_modes - get complete set of display modes
  59  * @dev: DRM device
  60  * @maxX: max width for modes
  61  * @maxY: max height for modes
  62  *
  63  * LOCKING:
  64  * Caller must hold mode config lock.
  65  *
  66  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  67  * modes on them.  Modes will first be added to the connector's probed_modes
  68  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  69  * put into the normal modes list.
  70  *
  71  * Intended to be used either at bootup time or when major configuration
  72  * changes have occurred.
  73  *
  74  * FIXME: take into account monitor limits
  75  *
  76  * RETURNS:
  77  * Number of modes found on @connector.
  78  */
  79 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  80                                             uint32_t maxX, uint32_t maxY)
  81 {
  82         struct drm_device *dev = connector->dev;
  83         struct drm_display_mode *mode, *t;
  84         struct drm_connector_helper_funcs *connector_funcs =
  85                 connector->helper_private;
  86         int count = 0;
  87         int mode_flags = 0;
  88
  89         DRM_DEBUG_KMS("%s\n", drm_get_connector_name(connector));
  90         /* set all modes to the unverified state */
  91         list_for_each_entry_safe(mode, t, &connector->modes, head)
  92                 mode->status = MODE_UNVERIFIED;
  93
  94         if (connector->force) {
  95                 if (connector->force == DRM_FORCE_ON)
  96                         connector->status = connector_status_connected;
  97                 else
  98                         connector->status = connector_status_disconnected;
  99                 if (connector->funcs->force)
 100                         connector->funcs->force(connector);
 101         } else
 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                 goto prune;
 108         }
 109
 110         count = (*connector_funcs->get_modes)(connector);
 111         if (!count) {
 112                 count = drm_add_modes_noedid(connector, 800, 600);
 113                 if (!count)
 114                         return 0;
 115         }
 116
 117         drm_mode_connector_list_update(connector);
 118
 119         if (maxX && maxY)
 120                 drm_mode_validate_size(dev, &connector->modes, maxX,
 121                                        maxY, 0);
 122
 123         if (connector->interlace_allowed)
 124                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 125         if (connector->doublescan_allowed)
 126                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 127         drm_mode_validate_flag(connector, mode_flags);
 128
 129         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 130                 if (mode->status == MODE_OK)
 131                         mode->status = connector_funcs->mode_valid(connector,
 132                                                                    mode);
 133         }
 134
 135 prune:
 136         drm_mode_prune_invalid(dev, &connector->modes, true);
 137
 138         if (list_empty(&connector->modes))
 139                 return 0;
 140
 141         drm_mode_sort(&connector->modes);
 142
 143         DRM_DEBUG_KMS("Probed modes for %s\n",
 144                                 drm_get_connector_name(connector));
 145         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 146                 mode->vrefresh = drm_mode_vrefresh(mode);
 147
 148                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 149                 drm_mode_debug_printmodeline(mode);
 150         }
 151
 152         return count;
 153 }
 154 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 155
 156 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
 157                                       uint32_t maxY)
 158 {
 159         struct drm_connector *connector;
 160         int count = 0;
 161
 162         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 163                 count += drm_helper_probe_single_connector_modes(connector,
 164                                                                  maxX, maxY);
 165         }
 166
 167         return count;
 168 }
 169 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
 170
 171 /**
 172  * drm_helper_encoder_in_use - check if a given encoder is in use
 173  * @encoder: encoder to check
 174  *
 175  * LOCKING:
 176  * Caller must hold mode config lock.
 177  *
 178  * Walk @encoders's DRM device's mode_config and see if it's in use.
 179  *
 180  * RETURNS:
 181  * True if @encoder is part of the mode_config, false otherwise.
 182  */
 183 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 184 {
 185         struct drm_connector *connector;
 186         struct drm_device *dev = encoder->dev;
 187         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 188                 if (connector->encoder == encoder)
 189                         return true;
 190         return false;
 191 }
 192 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 193
 194 /**
 195  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 196  * @crtc: CRTC to check
 197  *
 198  * LOCKING:
 199  * Caller must hold mode config lock.
 200  *
 201  * Walk @crtc's DRM device's mode_config and see if it's in use.
 202  *
 203  * RETURNS:
 204  * True if @crtc is part of the mode_config, false otherwise.
 205  */
 206 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 207 {
 208         struct drm_encoder *encoder;
 209         struct drm_device *dev = crtc->dev;
 210         /* FIXME: Locking around list access? */
 211         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 212                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 213                         return true;
 214         return false;
 215 }
 216 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 217
 218 /**
 219  * drm_disable_unused_functions - disable unused objects
 220  * @dev: DRM device
 221  *
 222  * LOCKING:
 223  * Caller must hold mode config lock.
 224  *
 225  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 226  * by calling its dpms function, which should power it off.
 227  */
 228 void drm_helper_disable_unused_functions(struct drm_device *dev)
 229 {
 230         struct drm_encoder *encoder;
 231         struct drm_connector *connector;
 232         struct drm_encoder_helper_funcs *encoder_funcs;
 233         struct drm_crtc *crtc;
 234
 235         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 236                 if (!connector->encoder)
 237                         continue;
 238                 if (connector->status == connector_status_disconnected)
 239                         connector->encoder = NULL;
 240         }
 241
 242         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 243                 encoder_funcs = encoder->helper_private;
 244                 if (!drm_helper_encoder_in_use(encoder)) {
 245                         if (encoder_funcs->disable)
 246                                 (*encoder_funcs->disable)(encoder);
 247                         else
 248                                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 249                         /* disconnector encoder from any connector */
 250                         encoder->crtc = NULL;
 251                 }
 252         }
 253
 254         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 255                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 256                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 257                 if (!crtc->enabled) {
 258                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 259                         crtc->fb = NULL;
 260                 }
 261         }
 262 }
 263 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 264
 265 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 266 {
 267         struct drm_display_mode *mode;
 268
 269         list_for_each_entry(mode, &connector->modes, head) {
 270                 if (drm_mode_width(mode) > width ||
 271                     drm_mode_height(mode) > height)
 272                         continue;
 273                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 274                         return mode;
 275         }
 276         return NULL;
 277 }
 278
 279 static bool drm_has_cmdline_mode(struct drm_connector *connector)
 280 {
 281         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 282         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 283
 284         if (!fb_help_conn)
 285                 return false;
 286
 287         cmdline_mode = &fb_help_conn->cmdline_mode;
 288         return cmdline_mode->specified;
 289 }
 290
 291 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
 292 {
 293         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 294         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 295         struct drm_display_mode *mode = NULL;
 296
 297         if (!fb_help_conn)
 298                 return mode;
 299
 300         cmdline_mode = &fb_help_conn->cmdline_mode;
 301         if (cmdline_mode->specified == false)
 302                 return mode;
 303
 304         /* attempt to find a matching mode in the list of modes
 305          *  we have gotten so far, if not add a CVT mode that conforms
 306          */
 307         if (cmdline_mode->rb || cmdline_mode->margins)
 308                 goto create_mode;
 309
 310         list_for_each_entry(mode, &connector->modes, head) {
 311                 /* check width/height */
 312                 if (mode->hdisplay != cmdline_mode->xres ||
 313                     mode->vdisplay != cmdline_mode->yres)
 314                         continue;
 315
 316                 if (cmdline_mode->refresh_specified) {
 317                         if (mode->vrefresh != cmdline_mode->refresh)
 318                                 continue;
 319                 }
 320
 321                 if (cmdline_mode->interlace) {
 322                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
 323                                 continue;
 324                 }
 325                 return mode;
 326         }
 327
 328 create_mode:
 329         mode = drm_cvt_mode(connector->dev, cmdline_mode->xres,
 330                             cmdline_mode->yres,
 331                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
 332                             cmdline_mode->rb, cmdline_mode->interlace,
 333                             cmdline_mode->margins);
 334         list_add(&mode->head, &connector->modes);
 335         return mode;
 336 }
 337
 338 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 339 {
 340         bool enable;
 341
 342         if (strict) {
 343                 enable = connector->status == connector_status_connected;
 344         } else {
 345                 enable = connector->status != connector_status_disconnected;
 346         }
 347         return enable;
 348 }
 349
 350 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 351 {
 352         bool any_enabled = false;
 353         struct drm_connector *connector;
 354         int i = 0;
 355
 356         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 357                 enabled[i] = drm_connector_enabled(connector, true);
 358                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
 359                           enabled[i] ? "yes" : "no");
 360                 any_enabled |= enabled[i];
 361                 i++;
 362         }
 363
 364         if (any_enabled)
 365                 return;
 366
 367         i = 0;
 368         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 369                 enabled[i] = drm_connector_enabled(connector, false);
 370                 i++;
 371         }
 372 }
 373
 374 static bool drm_target_preferred(struct drm_device *dev,
 375                                  struct drm_display_mode **modes,
 376                                  bool *enabled, int width, int height)
 377 {
 378         struct drm_connector *connector;
 379         int i = 0;
 380
 381         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 382
 383                 if (enabled[i] == false) {
 384                         i++;
 385                         continue;
 386                 }
 387
 388                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
 389                               connector->base.id);
 390
 391                 /* got for command line mode first */
 392                 modes[i] = drm_pick_cmdline_mode(connector, width, height);
 393                 if (!modes[i]) {
 394                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 395                                       connector->base.id);
 396                         modes[i] = drm_has_preferred_mode(connector, width, height);
 397                 }
 398                 /* No preferred modes, pick one off the list */
 399                 if (!modes[i] && !list_empty(&connector->modes)) {
 400                         list_for_each_entry(modes[i], &connector->modes, head)
 401                                 break;
 402                 }
 403                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
 404                           "none");
 405                 i++;
 406         }
 407         return true;
 408 }
 409
 410 static int drm_pick_crtcs(struct drm_device *dev,
 411                           struct drm_crtc **best_crtcs,
 412                           struct drm_display_mode **modes,
 413                           int n, int width, int height)
 414 {
 415         int c, o;
 416         struct drm_connector *connector;
 417         struct drm_connector_helper_funcs *connector_funcs;
 418         struct drm_encoder *encoder;
 419         struct drm_crtc *best_crtc;
 420         int my_score, best_score, score;
 421         struct drm_crtc **crtcs, *crtc;
 422
 423         if (n == dev->mode_config.num_connector)
 424                 return 0;
 425         c = 0;
 426         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 427                 if (c == n)
 428                         break;
 429                 c++;
 430         }
 431
 432         best_crtcs[n] = NULL;
 433         best_crtc = NULL;
 434         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 435         if (modes[n] == NULL)
 436                 return best_score;
 437
 438         crtcs = kmalloc(dev->mode_config.num_connector *
 439                         sizeof(struct drm_crtc *), GFP_KERNEL);
 440         if (!crtcs)
 441                 return best_score;
 442
 443         my_score = 1;
 444         if (connector->status == connector_status_connected)
 445                 my_score++;
 446         if (drm_has_cmdline_mode(connector))
 447                 my_score++;
 448         if (drm_has_preferred_mode(connector, width, height))
 449                 my_score++;
 450
 451         connector_funcs = connector->helper_private;
 452         encoder = connector_funcs->best_encoder(connector);
 453         if (!encoder)
 454                 goto out;
 455
 456         connector->encoder = encoder;
 457
 458         /* select a crtc for this connector and then attempt to configure
 459            remaining connectors */
 460         c = 0;
 461         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 462
 463                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
 464                         c++;
 465                         continue;
 466                 }
 467
 468                 for (o = 0; o < n; o++)
 469                         if (best_crtcs[o] == crtc)
 470                                 break;
 471
 472                 if (o < n) {
 473                         /* ignore cloning for now */
 474                         c++;
 475                         continue;
 476                 }
 477
 478                 crtcs[n] = crtc;
 479                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 480                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
 481                                                   width, height);
 482                 if (score > best_score) {
 483                         best_crtc = crtc;
 484                         best_score = score;
 485                         memcpy(best_crtcs, crtcs,
 486                                dev->mode_config.num_connector *
 487                                sizeof(struct drm_crtc *));
 488                 }
 489                 c++;
 490         }
 491 out:
 492         kfree(crtcs);
 493         return best_score;
 494 }
 495
 496 static void drm_setup_crtcs(struct drm_device *dev)
 497 {
 498         struct drm_crtc **crtcs;
 499         struct drm_display_mode **modes;
 500         struct drm_encoder *encoder;
 501         struct drm_connector *connector;
 502         bool *enabled;
 503         int width, height;
 504         int i, ret;
 505
 506         DRM_DEBUG_KMS("\n");
 507
 508         width = dev->mode_config.max_width;
 509         height = dev->mode_config.max_height;
 510
 511         /* clean out all the encoder/crtc combos */
 512         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 513                 encoder->crtc = NULL;
 514         }
 515
 516         crtcs = kcalloc(dev->mode_config.num_connector,
 517                         sizeof(struct drm_crtc *), GFP_KERNEL);
 518         modes = kcalloc(dev->mode_config.num_connector,
 519                         sizeof(struct drm_display_mode *), GFP_KERNEL);
 520         enabled = kcalloc(dev->mode_config.num_connector,
 521                           sizeof(bool), GFP_KERNEL);
 522
 523         drm_enable_connectors(dev, enabled);
 524
 525         ret = drm_target_preferred(dev, modes, enabled, width, height);
 526         if (!ret)
 527                 DRM_ERROR("Unable to find initial modes\n");
 528
 529         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
 530
 531         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 532
 533         i = 0;
 534         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 535                 struct drm_display_mode *mode = modes[i];
 536                 struct drm_crtc *crtc = crtcs[i];
 537
 538                 if (connector->encoder == NULL) {
 539                         i++;
 540                         continue;
 541                 }
 542
 543                 if (mode && crtc) {
 544                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
 545                                   mode->name, crtc->base.id);
 546                         crtc->desired_mode = mode;
 547                         connector->encoder->crtc = crtc;
 548                 } else {
 549                         connector->encoder->crtc = NULL;
 550                         connector->encoder = NULL;
 551                 }
 552                 i++;
 553         }
 554
 555         kfree(crtcs);
 556         kfree(modes);
 557         kfree(enabled);
 558 }
 559
 560 /**
 561  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 562  * @encoder: encoder to test
 563  * @crtc: crtc to test
 564  *
 565  * Return false if @encoder can't be driven by @crtc, true otherwise.
 566  */
 567 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 568                                 struct drm_crtc *crtc)
 569 {
 570         struct drm_device *dev;
 571         struct drm_crtc *tmp;
 572         int crtc_mask = 1;
 573
 574         WARN(!crtc, "checking null crtc?");
 575
 576         dev = crtc->dev;
 577
 578         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 579                 if (tmp == crtc)
 580                         break;
 581                 crtc_mask <<= 1;
 582         }
 583
 584         if (encoder->possible_crtcs & crtc_mask)
 585                 return true;
 586         return false;
 587 }
 588
 589 /*
 590  * Check the CRTC we're going to map each output to vs. its current
 591  * CRTC.  If they don't match, we have to disable the output and the CRTC
 592  * since the driver will have to re-route things.
 593  */
 594 static void
 595 drm_crtc_prepare_encoders(struct drm_device *dev)
 596 {
 597         struct drm_encoder_helper_funcs *encoder_funcs;
 598         struct drm_encoder *encoder;
 599
 600         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 601                 encoder_funcs = encoder->helper_private;
 602                 /* Disable unused encoders */
 603                 if (encoder->crtc == NULL)
 604                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 605                 /* Disable encoders whose CRTC is about to change */
 606                 if (encoder_funcs->get_crtc &&
 607                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 608                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 609         }
 610 }
 611
 612 /**
 613  * drm_crtc_set_mode - set a mode
 614  * @crtc: CRTC to program
 615  * @mode: mode to use
 616  * @x: width of mode
 617  * @y: height of mode
 618  *
 619  * LOCKING:
 620  * Caller must hold mode config lock.
 621  *
 622  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 623  * to fixup or reject the mode prior to trying to set it.
 624  *
 625  * RETURNS:
 626  * True if the mode was set successfully, or false otherwise.
 627  */
 628 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 629                               struct drm_display_mode *mode,
 630                               int x, int y,
 631                               struct drm_framebuffer *old_fb)
 632 {
 633         struct drm_device *dev = crtc->dev;
 634         struct drm_display_mode *adjusted_mode, saved_mode;
 635         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 636         struct drm_encoder_helper_funcs *encoder_funcs;
 637         int saved_x, saved_y;
 638         struct drm_encoder *encoder;
 639         bool ret = true;
 640
 641         adjusted_mode = drm_mode_duplicate(dev, mode);
 642
 643         crtc->enabled = drm_helper_crtc_in_use(crtc);
 644
 645         if (!crtc->enabled)
 646                 return true;
 647
 648         saved_mode = crtc->mode;
 649         saved_x = crtc->x;
 650         saved_y = crtc->y;
 651
 652         /* Update crtc values up front so the driver can rely on them for mode
 653          * setting.
 654          */
 655         crtc->mode = *mode;
 656         crtc->x = x;
 657         crtc->y = y;
 658
 659         /* Pass our mode to the connectors and the CRTC to give them a chance to
 660          * adjust it according to limitations or connector properties, and also
 661          * a chance to reject the mode entirely.
 662          */
 663         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 664
 665                 if (encoder->crtc != crtc)
 666                         continue;
 667                 encoder_funcs = encoder->helper_private;
 668                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 669                                                       adjusted_mode))) {
 670                         goto done;
 671                 }
 672         }
 673
 674         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 675                 goto done;
 676         }
 677
 678         /* Prepare the encoders and CRTCs before setting the mode. */
 679         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 680
 681                 if (encoder->crtc != crtc)
 682                         continue;
 683                 encoder_funcs = encoder->helper_private;
 684                 /* Disable the encoders as the first thing we do. */
 685                 encoder_funcs->prepare(encoder);
 686         }
 687
 688         drm_crtc_prepare_encoders(dev);
 689
 690         crtc_funcs->prepare(crtc);
 691
 692         /* Set up the DPLL and any encoders state that needs to adjust or depend
 693          * on the DPLL.
 694          */
 695         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 696         if (!ret)
 697             goto done;
 698
 699         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 700
 701                 if (encoder->crtc != crtc)
 702                         continue;
 703
 704                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 705                          mode->name, mode->base.id);
 706                 encoder_funcs = encoder->helper_private;
 707                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 708         }
 709
 710         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 711         crtc_funcs->commit(crtc);
 712
 713         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 714
 715                 if (encoder->crtc != crtc)
 716                         continue;
 717
 718                 encoder_funcs = encoder->helper_private;
 719                 encoder_funcs->commit(encoder);
 720
 721         }
 722
 723         /* XXX free adjustedmode */
 724         drm_mode_destroy(dev, adjusted_mode);
 725         /* FIXME: add subpixel order */
 726 done:
 727         if (!ret) {
 728                 crtc->mode = saved_mode;
 729                 crtc->x = saved_x;
 730                 crtc->y = saved_y;
 731         }
 732
 733         return ret;
 734 }
 735 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 736
 737
 738 /**
 739  * drm_crtc_helper_set_config - set a new config from userspace
 740  * @crtc: CRTC to setup
 741  * @crtc_info: user provided configuration
 742  * @new_mode: new mode to set
 743  * @connector_set: set of connectors for the new config
 744  * @fb: new framebuffer
 745  *
 746  * LOCKING:
 747  * Caller must hold mode config lock.
 748  *
 749  * Setup a new configuration, provided by the user in @crtc_info, and enable
 750  * it.
 751  *
 752  * RETURNS:
 753  * Zero. (FIXME)
 754  */
 755 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 756 {
 757         struct drm_device *dev;
 758         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 759         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 760         struct drm_framebuffer *old_fb = NULL;
 761         bool mode_changed = false; /* if true do a full mode set */
 762         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 763         struct drm_connector *save_connectors, *connector;
 764         int count = 0, ro, fail = 0;
 765         struct drm_crtc_helper_funcs *crtc_funcs;
 766         int ret = 0;
 767
 768         DRM_DEBUG_KMS("\n");
 769
 770         if (!set)
 771                 return -EINVAL;
 772
 773         if (!set->crtc)
 774                 return -EINVAL;
 775
 776         if (!set->crtc->helper_private)
 777                 return -EINVAL;
 778
 779         crtc_funcs = set->crtc->helper_private;
 780
 781         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
 782                         " %d (x, y) (%i, %i)\n",
 783                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 784                   (int)set->num_connectors, set->x, set->y);
 785
 786         dev = set->crtc->dev;
 787
 788         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 789          * connector data. */
 790         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 791                              sizeof(struct drm_crtc), GFP_KERNEL);
 792         if (!save_crtcs)
 793                 return -ENOMEM;
 794
 795         save_encoders = kzalloc(dev->mode_config.num_encoder *
 796                                 sizeof(struct drm_encoder), GFP_KERNEL);
 797         if (!save_encoders) {
 798                 kfree(save_crtcs);
 799                 return -ENOMEM;
 800         }
 801
 802         save_connectors = kzalloc(dev->mode_config.num_connector *
 803                                 sizeof(struct drm_connector), GFP_KERNEL);
 804         if (!save_connectors) {
 805                 kfree(save_crtcs);
 806                 kfree(save_encoders);
 807                 return -ENOMEM;
 808         }
 809
 810         /* Copy data. Note that driver private data is not affected.
 811          * Should anything bad happen only the expected state is
 812          * restored, not the drivers personal bookkeeping.
 813          */
 814         count = 0;
 815         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 816                 save_crtcs[count++] = *crtc;
 817         }
 818
 819         count = 0;
 820         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 821                 save_encoders[count++] = *encoder;
 822         }
 823
 824         count = 0;
 825         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 826                 save_connectors[count++] = *connector;
 827         }
 828
 829         /* We should be able to check here if the fb has the same properties
 830          * and then just flip_or_move it */
 831         if (set->crtc->fb != set->fb) {
 832                 /* If we have no fb then treat it as a full mode set */
 833                 if (set->crtc->fb == NULL) {
 834                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 835                         mode_changed = true;
 836                 } else if (set->fb == NULL) {
 837                         mode_changed = true;
 838                 } else if ((set->fb->bits_per_pixel !=
 839                          set->crtc->fb->bits_per_pixel) ||
 840                          set->fb->depth != set->crtc->fb->depth)
 841                         fb_changed = true;
 842                 else
 843                         fb_changed = true;
 844         }
 845
 846         if (set->x != set->crtc->x || set->y != set->crtc->y)
 847                 fb_changed = true;
 848
 849         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 850                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 851                 drm_mode_debug_printmodeline(&set->crtc->mode);
 852                 drm_mode_debug_printmodeline(set->mode);
 853                 mode_changed = true;
 854         }
 855
 856         /* a) traverse passed in connector list and get encoders for them */
 857         count = 0;
 858         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 859                 struct drm_connector_helper_funcs *connector_funcs =
 860                         connector->helper_private;
 861                 new_encoder = connector->encoder;
 862                 for (ro = 0; ro < set->num_connectors; ro++) {
 863                         if (set->connectors[ro] == connector) {
 864                                 new_encoder = connector_funcs->best_encoder(connector);
 865                                 /* if we can't get an encoder for a connector
 866                                    we are setting now - then fail */
 867                                 if (new_encoder == NULL)
 868                                         /* don't break so fail path works correct */
 869                                         fail = 1;
 870                                 break;
 871                         }
 872                 }
 873
 874                 if (new_encoder != connector->encoder) {
 875                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 876                         mode_changed = true;
 877                         /* If the encoder is reused for another connector, then
 878                          * the appropriate crtc will be set later.
 879                          */
 880                         if (connector->encoder)
 881                                 connector->encoder->crtc = NULL;
 882                         connector->encoder = new_encoder;
 883                 }
 884         }
 885
 886         if (fail) {
 887                 ret = -EINVAL;
 888                 goto fail;
 889         }
 890
 891         count = 0;
 892         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 893                 if (!connector->encoder)
 894                         continue;
 895
 896                 if (connector->encoder->crtc == set->crtc)
 897                         new_crtc = NULL;
 898                 else
 899                         new_crtc = connector->encoder->crtc;
 900
 901                 for (ro = 0; ro < set->num_connectors; ro++) {
 902                         if (set->connectors[ro] == connector)
 903                                 new_crtc = set->crtc;
 904                 }
 905
 906                 /* Make sure the new CRTC will work with the encoder */
 907                 if (new_crtc &&
 908                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 909                         ret = -EINVAL;
 910                         goto fail;
 911                 }
 912                 if (new_crtc != connector->encoder->crtc) {
 913                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 914                         mode_changed = true;
 915                         connector->encoder->crtc = new_crtc;
 916                 }
 917                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
 918                           connector->base.id, new_crtc);
 919         }
 920
 921         /* mode_set_base is not a required function */
 922         if (fb_changed && !crtc_funcs->mode_set_base)
 923                 mode_changed = true;
 924
 925         if (mode_changed) {
 926                 old_fb = set->crtc->fb;
 927                 set->crtc->fb = set->fb;
 928                 set->crtc->enabled = (set->mode != NULL);
 929                 if (set->mode != NULL) {
 930                         DRM_DEBUG_KMS("attempting to set mode from"
 931                                         " userspace\n");
 932                         drm_mode_debug_printmodeline(set->mode);
 933                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 934                                                       set->x, set->y,
 935                                                       old_fb)) {
 936                                 DRM_ERROR("failed to set mode on crtc %p\n",
 937                                           set->crtc);
 938                                 ret = -EINVAL;
 939                                 goto fail;
 940                         }
 941                         /* TODO are these needed? */
 942                         set->crtc->desired_x = set->x;
 943                         set->crtc->desired_y = set->y;
 944                         set->crtc->desired_mode = set->mode;
 945                 }
 946                 drm_helper_disable_unused_functions(dev);
 947         } else if (fb_changed) {
 948                 set->crtc->x = set->x;
 949                 set->crtc->y = set->y;
 950
 951                 old_fb = set->crtc->fb;
 952                 if (set->crtc->fb != set->fb)
 953                         set->crtc->fb = set->fb;
 954                 ret = crtc_funcs->mode_set_base(set->crtc,
 955                                                 set->x, set->y, old_fb);
 956                 if (ret != 0)
 957                         goto fail;
 958         }
 959
 960         kfree(save_connectors);
 961         kfree(save_encoders);
 962         kfree(save_crtcs);
 963         return 0;
 964
 965 fail:
 966         /* Restore all previous data. */
 967         count = 0;
 968         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 969                 *crtc = save_crtcs[count++];
 970         }
 971
 972         count = 0;
 973         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 974                 *encoder = save_encoders[count++];
 975         }
 976
 977         count = 0;
 978         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 979                 *connector = save_connectors[count++];
 980         }
 981
 982         kfree(save_connectors);
 983         kfree(save_encoders);
 984         kfree(save_crtcs);
 985         return ret;
 986 }
 987 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 988
 989 bool drm_helper_plugged_event(struct drm_device *dev)
 990 {
 991         DRM_DEBUG_KMS("\n");
 992
 993         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
 994                                          dev->mode_config.max_height);
 995
 996         drm_setup_crtcs(dev);
 997
 998         /* alert the driver fb layer */
 999         dev->mode_config.funcs->fb_changed(dev);
1000
1001         /* FIXME: send hotplug event */
1002         return true;
1003 }
1004 /**
1005  * drm_initial_config - setup a sane initial connector configuration
1006  * @dev: DRM device
1007  *
1008  * LOCKING:
1009  * Called at init time, must take mode config lock.
1010  *
1011  * Scan the CRTCs and connectors and try to put together an initial setup.
1012  * At the moment, this is a cloned configuration across all heads with
1013  * a new framebuffer object as the backing store.
1014  *
1015  * RETURNS:
1016  * Zero if everything went ok, nonzero otherwise.
1017  */
1018 bool drm_helper_initial_config(struct drm_device *dev)
1019 {
1020         int count = 0;
1021
1022         drm_fb_helper_parse_command_line(dev);
1023
1024         count = drm_helper_probe_connector_modes(dev,
1025                                                  dev->mode_config.max_width,
1026                                                  dev->mode_config.max_height);
1027
1028         /*
1029          * we shouldn't end up with no modes here.
1030          */
1031         WARN(!count, "No connectors reported connected with modes\n");
1032
1033         drm_setup_crtcs(dev);
1034
1035         /* alert the driver fb layer */
1036         dev->mode_config.funcs->fb_changed(dev);
1037
1038         return 0;
1039 }
1040 EXPORT_SYMBOL(drm_helper_initial_config);
1041
1042 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
1043 {
1044         int dpms = DRM_MODE_DPMS_OFF;
1045         struct drm_connector *connector;
1046         struct drm_device *dev = encoder->dev;
1047
1048         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1049                 if (connector->encoder == encoder)
1050                         if (connector->dpms < dpms)
1051                                 dpms = connector->dpms;
1052         return dpms;
1053 }
1054
1055 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
1056 {
1057         int dpms = DRM_MODE_DPMS_OFF;
1058         struct drm_connector *connector;
1059         struct drm_device *dev = crtc->dev;
1060
1061         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1062                 if (connector->encoder && connector->encoder->crtc == crtc)
1063                         if (connector->dpms < dpms)
1064                                 dpms = connector->dpms;
1065         return dpms;
1066 }
1067
1068 /**
1069  * drm_helper_connector_dpms
1070  * @connector affected connector
1071  * @mode DPMS mode
1072  *
1073  * Calls the low-level connector DPMS function, then
1074  * calls appropriate encoder and crtc DPMS functions as well
1075  */
1076 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
1077 {
1078         struct drm_encoder *encoder = connector->encoder;
1079         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
1080         int old_dpms;
1081
1082         if (mode == connector->dpms)
1083                 return;
1084
1085         old_dpms = connector->dpms;
1086         connector->dpms = mode;
1087
1088         /* from off to on, do crtc then encoder */
1089         if (mode < old_dpms) {
1090                 if (crtc) {
1091                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1092                         if (crtc_funcs->dpms)
1093                                 (*crtc_funcs->dpms) (crtc,
1094                                                      drm_helper_choose_crtc_dpms(crtc));
1095                 }
1096                 if (encoder) {
1097                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1098                         if (encoder_funcs->dpms)
1099                                 (*encoder_funcs->dpms) (encoder,
1100                                                         drm_helper_choose_encoder_dpms(encoder));
1101                 }
1102         }
1103
1104         /* from on to off, do encoder then crtc */
1105         if (mode > old_dpms) {
1106                 if (encoder) {
1107                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1108                         if (encoder_funcs->dpms)
1109                                 (*encoder_funcs->dpms) (encoder,
1110                                                         drm_helper_choose_encoder_dpms(encoder));
1111                 }
1112                 if (crtc) {
1113                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1114                         if (crtc_funcs->dpms)
1115                                 (*crtc_funcs->dpms) (crtc,
1116                                                      drm_helper_choose_crtc_dpms(crtc));
1117                 }
1118         }
1119
1120         return;
1121 }
1122 EXPORT_SYMBOL(drm_helper_connector_dpms);
1123
1124 /**
1125  * drm_hotplug_stage_two
1126  * @dev DRM device
1127  * @connector hotpluged connector
1128  *
1129  * LOCKING.
1130  * Caller must hold mode config lock, function might grab struct lock.
1131  *
1132  * Stage two of a hotplug.
1133  *
1134  * RETURNS:
1135  * Zero on success, errno on failure.
1136  */
1137 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1138 {
1139         drm_helper_plugged_event(dev);
1140
1141         return 0;
1142 }
1143 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1144
1145 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1146                                    struct drm_mode_fb_cmd *mode_cmd)
1147 {
1148         fb->width = mode_cmd->width;
1149         fb->height = mode_cmd->height;
1150         fb->pitch = mode_cmd->pitch;
1151         fb->bits_per_pixel = mode_cmd->bpp;
1152         fb->depth = mode_cmd->depth;
1153
1154         return 0;
1155 }
1156 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1157
1158 int drm_helper_resume_force_mode(struct drm_device *dev)
1159 {
1160         struct drm_crtc *crtc;
1161         int ret;
1162
1163         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1164
1165                 if (!crtc->enabled)
1166                         continue;
1167
1168                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1169                                                crtc->x, crtc->y, crtc->fb);
1170
1171                 if (ret == false)
1172                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1173         }
1174         /* disable the unused connectors while restoring the modesetting */
1175         drm_helper_disable_unused_functions(dev);
1176         return 0;
1177 }
1178 EXPORT_SYMBOL(drm_helper_resume_force_mode);