drivers/gpu/drm/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <[email protected]>
   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 <[email protected]>
  28  *      Dave Airlie <[email protected]>
  29  *      Jesse Barnes <[email protected]>
  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_single_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("[CONNECTOR:%d:%s]\n", connector->base.id,
  90                         drm_get_connector_name(connector));
  91         /* set all modes to the unverified state */
  92         list_for_each_entry_safe(mode, t, &connector->modes, head)
  93                 mode->status = MODE_UNVERIFIED;
  94
  95         if (connector->force) {
  96                 if (connector->force == DRM_FORCE_ON)
  97                         connector->status = connector_status_connected;
  98                 else
  99                         connector->status = connector_status_disconnected;
 100                 if (connector->funcs->force)
 101                         connector->funcs->force(connector);
 102         } else
 103                 connector->status = connector->funcs->detect(connector);
 104
 105         if (connector->status == connector_status_disconnected) {
 106                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 107                         connector->base.id, drm_get_connector_name(connector));
 108                 drm_mode_connector_update_edid_property(connector, NULL);
 109                 goto prune;
 110         }
 111
 112         count = (*connector_funcs->get_modes)(connector);
 113         if (!count) {
 114                 count = drm_add_modes_noedid(connector, 1024, 768);
 115                 if (!count)
 116                         return 0;
 117         }
 118
 119         drm_mode_connector_list_update(connector);
 120
 121         if (maxX && maxY)
 122                 drm_mode_validate_size(dev, &connector->modes, maxX,
 123                                        maxY, 0);
 124
 125         if (connector->interlace_allowed)
 126                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 127         if (connector->doublescan_allowed)
 128                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 129         drm_mode_validate_flag(connector, mode_flags);
 130
 131         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 132                 if (mode->status == MODE_OK)
 133                         mode->status = connector_funcs->mode_valid(connector,
 134                                                                    mode);
 135         }
 136
 137 prune:
 138         drm_mode_prune_invalid(dev, &connector->modes, true);
 139
 140         if (list_empty(&connector->modes))
 141                 return 0;
 142
 143         drm_mode_sort(&connector->modes);
 144
 145         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 146                         drm_get_connector_name(connector));
 147         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 148                 mode->vrefresh = drm_mode_vrefresh(mode);
 149
 150                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 151                 drm_mode_debug_printmodeline(mode);
 152         }
 153
 154         return count;
 155 }
 156 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 157
 158 /**
 159  * drm_helper_encoder_in_use - check if a given encoder is in use
 160  * @encoder: encoder to check
 161  *
 162  * LOCKING:
 163  * Caller must hold mode config lock.
 164  *
 165  * Walk @encoders's DRM device's mode_config and see if it's in use.
 166  *
 167  * RETURNS:
 168  * True if @encoder is part of the mode_config, false otherwise.
 169  */
 170 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 171 {
 172         struct drm_connector *connector;
 173         struct drm_device *dev = encoder->dev;
 174         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 175                 if (connector->encoder == encoder)
 176                         return true;
 177         return false;
 178 }
 179 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 180
 181 /**
 182  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 183  * @crtc: CRTC to check
 184  *
 185  * LOCKING:
 186  * Caller must hold mode config lock.
 187  *
 188  * Walk @crtc's DRM device's mode_config and see if it's in use.
 189  *
 190  * RETURNS:
 191  * True if @crtc is part of the mode_config, false otherwise.
 192  */
 193 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 194 {
 195         struct drm_encoder *encoder;
 196         struct drm_device *dev = crtc->dev;
 197         /* FIXME: Locking around list access? */
 198         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 199                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 200                         return true;
 201         return false;
 202 }
 203 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 204
 205 static void
 206 drm_encoder_disable(struct drm_encoder *encoder)
 207 {
 208         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 209
 210         if (encoder_funcs->disable)
 211                 (*encoder_funcs->disable)(encoder);
 212         else
 213                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 214 }
 215
 216 /**
 217  * drm_helper_disable_unused_functions - disable unused objects
 218  * @dev: DRM device
 219  *
 220  * LOCKING:
 221  * Caller must hold mode config lock.
 222  *
 223  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 224  * by calling its dpms function, which should power it off.
 225  */
 226 void drm_helper_disable_unused_functions(struct drm_device *dev)
 227 {
 228         struct drm_encoder *encoder;
 229         struct drm_connector *connector;
 230         struct drm_crtc *crtc;
 231
 232         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 233                 if (!connector->encoder)
 234                         continue;
 235                 if (connector->status == connector_status_disconnected)
 236                         connector->encoder = NULL;
 237         }
 238
 239         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 240                 if (!drm_helper_encoder_in_use(encoder)) {
 241                         drm_encoder_disable(encoder);
 242                         /* disconnector encoder from any connector */
 243                         encoder->crtc = NULL;
 244                 }
 245         }
 246
 247         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 248                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 249                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 250                 if (!crtc->enabled) {
 251                         if (crtc_funcs->disable)
 252                                 (*crtc_funcs->disable)(crtc);
 253                         else
 254                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 255                         crtc->fb = NULL;
 256                 }
 257         }
 258 }
 259 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 260
 261 /**
 262  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 263  * @encoder: encoder to test
 264  * @crtc: crtc to test
 265  *
 266  * Return false if @encoder can't be driven by @crtc, true otherwise.
 267  */
 268 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 269                                 struct drm_crtc *crtc)
 270 {
 271         struct drm_device *dev;
 272         struct drm_crtc *tmp;
 273         int crtc_mask = 1;
 274
 275         WARN(!crtc, "checking null crtc?");
 276
 277         dev = crtc->dev;
 278
 279         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 280                 if (tmp == crtc)
 281                         break;
 282                 crtc_mask <<= 1;
 283         }
 284
 285         if (encoder->possible_crtcs & crtc_mask)
 286                 return true;
 287         return false;
 288 }
 289
 290 /*
 291  * Check the CRTC we're going to map each output to vs. its current
 292  * CRTC.  If they don't match, we have to disable the output and the CRTC
 293  * since the driver will have to re-route things.
 294  */
 295 static void
 296 drm_crtc_prepare_encoders(struct drm_device *dev)
 297 {
 298         struct drm_encoder_helper_funcs *encoder_funcs;
 299         struct drm_encoder *encoder;
 300
 301         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 302                 encoder_funcs = encoder->helper_private;
 303                 /* Disable unused encoders */
 304                 if (encoder->crtc == NULL)
 305                         drm_encoder_disable(encoder);
 306                 /* Disable encoders whose CRTC is about to change */
 307                 if (encoder_funcs->get_crtc &&
 308                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 309                         drm_encoder_disable(encoder);
 310         }
 311 }
 312
 313 /**
 314  * drm_crtc_set_mode - set a mode
 315  * @crtc: CRTC to program
 316  * @mode: mode to use
 317  * @x: width of mode
 318  * @y: height of mode
 319  *
 320  * LOCKING:
 321  * Caller must hold mode config lock.
 322  *
 323  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 324  * to fixup or reject the mode prior to trying to set it.
 325  *
 326  * RETURNS:
 327  * True if the mode was set successfully, or false otherwise.
 328  */
 329 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 330                               struct drm_display_mode *mode,
 331                               int x, int y,
 332                               struct drm_framebuffer *old_fb)
 333 {
 334         struct drm_device *dev = crtc->dev;
 335         struct drm_display_mode *adjusted_mode, saved_mode;
 336         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 337         struct drm_encoder_helper_funcs *encoder_funcs;
 338         int saved_x, saved_y;
 339         struct drm_encoder *encoder;
 340         bool ret = true;
 341
 342         adjusted_mode = drm_mode_duplicate(dev, mode);
 343
 344         crtc->enabled = drm_helper_crtc_in_use(crtc);
 345
 346         if (!crtc->enabled)
 347                 return true;
 348
 349         saved_mode = crtc->mode;
 350         saved_x = crtc->x;
 351         saved_y = crtc->y;
 352
 353         /* Update crtc values up front so the driver can rely on them for mode
 354          * setting.
 355          */
 356         crtc->mode = *mode;
 357         crtc->x = x;
 358         crtc->y = y;
 359
 360         /* Pass our mode to the connectors and the CRTC to give them a chance to
 361          * adjust it according to limitations or connector properties, and also
 362          * a chance to reject the mode entirely.
 363          */
 364         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 365
 366                 if (encoder->crtc != crtc)
 367                         continue;
 368                 encoder_funcs = encoder->helper_private;
 369                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 370                                                       adjusted_mode))) {
 371                         goto done;
 372                 }
 373         }
 374
 375         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 376                 goto done;
 377         }
 378         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 379
 380         /* Prepare the encoders and CRTCs before setting the mode. */
 381         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 382
 383                 if (encoder->crtc != crtc)
 384                         continue;
 385                 encoder_funcs = encoder->helper_private;
 386                 /* Disable the encoders as the first thing we do. */
 387                 encoder_funcs->prepare(encoder);
 388         }
 389
 390         drm_crtc_prepare_encoders(dev);
 391
 392         crtc_funcs->prepare(crtc);
 393
 394         /* Set up the DPLL and any encoders state that needs to adjust or depend
 395          * on the DPLL.
 396          */
 397         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 398         if (!ret)
 399             goto done;
 400
 401         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 402
 403                 if (encoder->crtc != crtc)
 404                         continue;
 405
 406                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 407                         encoder->base.id, drm_get_encoder_name(encoder),
 408                         mode->base.id, mode->name);
 409                 encoder_funcs = encoder->helper_private;
 410                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 411         }
 412
 413         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 414         crtc_funcs->commit(crtc);
 415
 416         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 417
 418                 if (encoder->crtc != crtc)
 419                         continue;
 420
 421                 encoder_funcs = encoder->helper_private;
 422                 encoder_funcs->commit(encoder);
 423
 424         }
 425
 426         /* XXX free adjustedmode */
 427         drm_mode_destroy(dev, adjusted_mode);
 428         /* FIXME: add subpixel order */
 429 done:
 430         if (!ret) {
 431                 crtc->mode = saved_mode;
 432                 crtc->x = saved_x;
 433                 crtc->y = saved_y;
 434         }
 435
 436         return ret;
 437 }
 438 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 439
 440
 441 /**
 442  * drm_crtc_helper_set_config - set a new config from userspace
 443  * @crtc: CRTC to setup
 444  * @crtc_info: user provided configuration
 445  * @new_mode: new mode to set
 446  * @connector_set: set of connectors for the new config
 447  * @fb: new framebuffer
 448  *
 449  * LOCKING:
 450  * Caller must hold mode config lock.
 451  *
 452  * Setup a new configuration, provided by the user in @crtc_info, and enable
 453  * it.
 454  *
 455  * RETURNS:
 456  * Zero. (FIXME)
 457  */
 458 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 459 {
 460         struct drm_device *dev;
 461         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 462         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 463         struct drm_framebuffer *old_fb = NULL;
 464         bool mode_changed = false; /* if true do a full mode set */
 465         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 466         struct drm_connector *save_connectors, *connector;
 467         int count = 0, ro, fail = 0;
 468         struct drm_crtc_helper_funcs *crtc_funcs;
 469         int ret = 0;
 470
 471         DRM_DEBUG_KMS("\n");
 472
 473         if (!set)
 474                 return -EINVAL;
 475
 476         if (!set->crtc)
 477                 return -EINVAL;
 478
 479         if (!set->crtc->helper_private)
 480                 return -EINVAL;
 481
 482         crtc_funcs = set->crtc->helper_private;
 483
 484         if (set->fb) {
 485                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 486                                 set->crtc->base.id, set->fb->base.id,
 487                                 (int)set->num_connectors, set->x, set->y);
 488         } else {
 489                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB] #connectors=%d (x y) (%i %i)\n",
 490                                 set->crtc->base.id, (int)set->num_connectors,
 491                                 set->x, set->y);
 492         }
 493
 494         dev = set->crtc->dev;
 495
 496         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 497          * connector data. */
 498         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 499                              sizeof(struct drm_crtc), GFP_KERNEL);
 500         if (!save_crtcs)
 501                 return -ENOMEM;
 502
 503         save_encoders = kzalloc(dev->mode_config.num_encoder *
 504                                 sizeof(struct drm_encoder), GFP_KERNEL);
 505         if (!save_encoders) {
 506                 kfree(save_crtcs);
 507                 return -ENOMEM;
 508         }
 509
 510         save_connectors = kzalloc(dev->mode_config.num_connector *
 511                                 sizeof(struct drm_connector), GFP_KERNEL);
 512         if (!save_connectors) {
 513                 kfree(save_crtcs);
 514                 kfree(save_encoders);
 515                 return -ENOMEM;
 516         }
 517
 518         /* Copy data. Note that driver private data is not affected.
 519          * Should anything bad happen only the expected state is
 520          * restored, not the drivers personal bookkeeping.
 521          */
 522         count = 0;
 523         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 524                 save_crtcs[count++] = *crtc;
 525         }
 526
 527         count = 0;
 528         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 529                 save_encoders[count++] = *encoder;
 530         }
 531
 532         count = 0;
 533         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 534                 save_connectors[count++] = *connector;
 535         }
 536
 537         /* We should be able to check here if the fb has the same properties
 538          * and then just flip_or_move it */
 539         if (set->crtc->fb != set->fb) {
 540                 /* If we have no fb then treat it as a full mode set */
 541                 if (set->crtc->fb == NULL) {
 542                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 543                         mode_changed = true;
 544                 } else if (set->fb == NULL) {
 545                         mode_changed = true;
 546                 } else
 547                         fb_changed = true;
 548         }
 549
 550         if (set->x != set->crtc->x || set->y != set->crtc->y)
 551                 fb_changed = true;
 552
 553         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 554                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 555                 drm_mode_debug_printmodeline(&set->crtc->mode);
 556                 drm_mode_debug_printmodeline(set->mode);
 557                 mode_changed = true;
 558         }
 559
 560         /* a) traverse passed in connector list and get encoders for them */
 561         count = 0;
 562         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 563                 struct drm_connector_helper_funcs *connector_funcs =
 564                         connector->helper_private;
 565                 new_encoder = connector->encoder;
 566                 for (ro = 0; ro < set->num_connectors; ro++) {
 567                         if (set->connectors[ro] == connector) {
 568                                 new_encoder = connector_funcs->best_encoder(connector);
 569                                 /* if we can't get an encoder for a connector
 570                                    we are setting now - then fail */
 571                                 if (new_encoder == NULL)
 572                                         /* don't break so fail path works correct */
 573                                         fail = 1;
 574                                 break;
 575                         }
 576                 }
 577
 578                 if (new_encoder != connector->encoder) {
 579                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 580                         mode_changed = true;
 581                         /* If the encoder is reused for another connector, then
 582                          * the appropriate crtc will be set later.
 583                          */
 584                         if (connector->encoder)
 585                                 connector->encoder->crtc = NULL;
 586                         connector->encoder = new_encoder;
 587                 }
 588         }
 589
 590         if (fail) {
 591                 ret = -EINVAL;
 592                 goto fail;
 593         }
 594
 595         count = 0;
 596         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 597                 if (!connector->encoder)
 598                         continue;
 599
 600                 if (connector->encoder->crtc == set->crtc)
 601                         new_crtc = NULL;
 602                 else
 603                         new_crtc = connector->encoder->crtc;
 604
 605                 for (ro = 0; ro < set->num_connectors; ro++) {
 606                         if (set->connectors[ro] == connector)
 607                                 new_crtc = set->crtc;
 608                 }
 609
 610                 /* Make sure the new CRTC will work with the encoder */
 611                 if (new_crtc &&
 612                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 613                         ret = -EINVAL;
 614                         goto fail;
 615                 }
 616                 if (new_crtc != connector->encoder->crtc) {
 617                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 618                         mode_changed = true;
 619                         connector->encoder->crtc = new_crtc;
 620                 }
 621                 if (new_crtc) {
 622                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 623                                 connector->base.id, drm_get_connector_name(connector),
 624                                 new_crtc->base.id);
 625                 } else {
 626                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 627                                 connector->base.id, drm_get_connector_name(connector));
 628                 }
 629         }
 630
 631         /* mode_set_base is not a required function */
 632         if (fb_changed && !crtc_funcs->mode_set_base)
 633                 mode_changed = true;
 634
 635         if (mode_changed) {
 636                 old_fb = set->crtc->fb;
 637                 set->crtc->fb = set->fb;
 638                 set->crtc->enabled = (set->mode != NULL);
 639                 if (set->mode != NULL) {
 640                         DRM_DEBUG_KMS("attempting to set mode from"
 641                                         " userspace\n");
 642                         drm_mode_debug_printmodeline(set->mode);
 643                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 644                                                       set->x, set->y,
 645                                                       old_fb)) {
 646                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 647                                           set->crtc->base.id);
 648                                 ret = -EINVAL;
 649                                 goto fail;
 650                         }
 651                 }
 652                 drm_helper_disable_unused_functions(dev);
 653         } else if (fb_changed) {
 654                 set->crtc->x = set->x;
 655                 set->crtc->y = set->y;
 656
 657                 old_fb = set->crtc->fb;
 658                 if (set->crtc->fb != set->fb)
 659                         set->crtc->fb = set->fb;
 660                 ret = crtc_funcs->mode_set_base(set->crtc,
 661                                                 set->x, set->y, old_fb);
 662                 if (ret != 0)
 663                         goto fail;
 664         }
 665
 666         kfree(save_connectors);
 667         kfree(save_encoders);
 668         kfree(save_crtcs);
 669         return 0;
 670
 671 fail:
 672         /* Restore all previous data. */
 673         count = 0;
 674         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 675                 *crtc = save_crtcs[count++];
 676         }
 677
 678         count = 0;
 679         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 680                 *encoder = save_encoders[count++];
 681         }
 682
 683         count = 0;
 684         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 685                 *connector = save_connectors[count++];
 686         }
 687
 688         kfree(save_connectors);
 689         kfree(save_encoders);
 690         kfree(save_crtcs);
 691         return ret;
 692 }
 693 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 694
 695 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 696 {
 697         int dpms = DRM_MODE_DPMS_OFF;
 698         struct drm_connector *connector;
 699         struct drm_device *dev = encoder->dev;
 700
 701         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 702                 if (connector->encoder == encoder)
 703                         if (connector->dpms < dpms)
 704                                 dpms = connector->dpms;
 705         return dpms;
 706 }
 707
 708 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 709 {
 710         int dpms = DRM_MODE_DPMS_OFF;
 711         struct drm_connector *connector;
 712         struct drm_device *dev = crtc->dev;
 713
 714         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 715                 if (connector->encoder && connector->encoder->crtc == crtc)
 716                         if (connector->dpms < dpms)
 717                                 dpms = connector->dpms;
 718         return dpms;
 719 }
 720
 721 /**
 722  * drm_helper_connector_dpms
 723  * @connector affected connector
 724  * @mode DPMS mode
 725  *
 726  * Calls the low-level connector DPMS function, then
 727  * calls appropriate encoder and crtc DPMS functions as well
 728  */
 729 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 730 {
 731         struct drm_encoder *encoder = connector->encoder;
 732         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 733         int old_dpms;
 734
 735         if (mode == connector->dpms)
 736                 return;
 737
 738         old_dpms = connector->dpms;
 739         connector->dpms = mode;
 740
 741         /* from off to on, do crtc then encoder */
 742         if (mode < old_dpms) {
 743                 if (crtc) {
 744                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 745                         if (crtc_funcs->dpms)
 746                                 (*crtc_funcs->dpms) (crtc,
 747                                                      drm_helper_choose_crtc_dpms(crtc));
 748                 }
 749                 if (encoder) {
 750                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 751                         if (encoder_funcs->dpms)
 752                                 (*encoder_funcs->dpms) (encoder,
 753                                                         drm_helper_choose_encoder_dpms(encoder));
 754                 }
 755         }
 756
 757         /* from on to off, do encoder then crtc */
 758         if (mode > old_dpms) {
 759                 if (encoder) {
 760                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 761                         if (encoder_funcs->dpms)
 762                                 (*encoder_funcs->dpms) (encoder,
 763                                                         drm_helper_choose_encoder_dpms(encoder));
 764                 }
 765                 if (crtc) {
 766                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 767                         if (crtc_funcs->dpms)
 768                                 (*crtc_funcs->dpms) (crtc,
 769                                                      drm_helper_choose_crtc_dpms(crtc));
 770                 }
 771         }
 772
 773         return;
 774 }
 775 EXPORT_SYMBOL(drm_helper_connector_dpms);
 776
 777 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 778                                    struct drm_mode_fb_cmd *mode_cmd)
 779 {
 780         fb->width = mode_cmd->width;
 781         fb->height = mode_cmd->height;
 782         fb->pitch = mode_cmd->pitch;
 783         fb->bits_per_pixel = mode_cmd->bpp;
 784         fb->depth = mode_cmd->depth;
 785
 786         return 0;
 787 }
 788 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 789
 790 int drm_helper_resume_force_mode(struct drm_device *dev)
 791 {
 792         struct drm_crtc *crtc;
 793         struct drm_encoder *encoder;
 794         struct drm_encoder_helper_funcs *encoder_funcs;
 795         struct drm_crtc_helper_funcs *crtc_funcs;
 796         int ret;
 797
 798         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 799
 800                 if (!crtc->enabled)
 801                         continue;
 802
 803                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 804                                                crtc->x, crtc->y, crtc->fb);
 805
 806                 if (ret == false)
 807                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 808
 809                 /* Turn off outputs that were already powered off */
 810                 if (drm_helper_choose_crtc_dpms(crtc)) {
 811                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 812
 813                                 if(encoder->crtc != crtc)
 814                                         continue;
 815
 816                                 encoder_funcs = encoder->helper_private;
 817                                 if (encoder_funcs->dpms)
 818                                         (*encoder_funcs->dpms) (encoder,
 819                                                                 drm_helper_choose_encoder_dpms(encoder));
 820                         }
 821
 822                         crtc_funcs = crtc->helper_private;
 823                         if (crtc_funcs->dpms)
 824                                 (*crtc_funcs->dpms) (crtc,
 825                                                      drm_helper_choose_crtc_dpms(crtc));
 826                 }
 827         }
 828         /* disable the unused connectors while restoring the modesetting */
 829         drm_helper_disable_unused_functions(dev);
 830         return 0;
 831 }
 832 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 833
 834 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 835 static void output_poll_execute(struct work_struct *work)
 836 {
 837         struct delayed_work *delayed_work = to_delayed_work(work);
 838         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 839         struct drm_connector *connector;
 840         enum drm_connector_status old_status, status;
 841         bool repoll = false, changed = false;
 842
 843         mutex_lock(&dev->mode_config.mutex);
 844         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 845
 846                 /* if this is HPD or polled don't check it -
 847                    TV out for instance */
 848                 if (!connector->polled)
 849                         continue;
 850
 851                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
 852                         repoll = true;
 853
 854                 old_status = connector->status;
 855                 /* if we are connected and don't want to poll for disconnect
 856                    skip it */
 857                 if (old_status == connector_status_connected &&
 858                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 859                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 860                         continue;
 861
 862                 status = connector->funcs->detect(connector);
 863                 if (old_status != status)
 864                         changed = true;
 865         }
 866
 867         mutex_unlock(&dev->mode_config.mutex);
 868
 869         if (changed) {
 870                 /* send a uevent + call fbdev */
 871                 drm_sysfs_hotplug_event(dev);
 872                 if (dev->mode_config.funcs->output_poll_changed)
 873                         dev->mode_config.funcs->output_poll_changed(dev);
 874         }
 875
 876         if (repoll)
 877                 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
 878 }
 879
 880 void drm_kms_helper_poll_disable(struct drm_device *dev)
 881 {
 882         if (!dev->mode_config.poll_enabled)
 883                 return;
 884         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
 885 }
 886 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 887
 888 void drm_kms_helper_poll_enable(struct drm_device *dev)
 889 {
 890         bool poll = false;
 891         struct drm_connector *connector;
 892
 893         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 894                 if (connector->polled)
 895                         poll = true;
 896         }
 897
 898         if (poll)
 899                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
 900 }
 901 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
 902
 903 void drm_kms_helper_poll_init(struct drm_device *dev)
 904 {
 905         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
 906         dev->mode_config.poll_enabled = true;
 907
 908         drm_kms_helper_poll_enable(dev);
 909 }
 910 EXPORT_SYMBOL(drm_kms_helper_poll_init);
 911
 912 void drm_kms_helper_poll_fini(struct drm_device *dev)
 913 {
 914         drm_kms_helper_poll_disable(dev);
 915 }
 916 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
 917
 918 void drm_helper_hpd_irq_event(struct drm_device *dev)
 919 {
 920         if (!dev->mode_config.poll_enabled)
 921                 return;
 922         /* kill timer and schedule immediate execution, this doesn't block */
 923         cancel_delayed_work(&dev->mode_config.output_poll_work);
 924         queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
 925 }
 926 EXPORT_SYMBOL(drm_helper_hpd_irq_event);