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 bool drm_kms_helper_poll = true;
  38 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  39
  40 static void drm_mode_validate_flag(struct drm_connector *connector,
  41                                    int flags)
  42 {
  43         struct drm_display_mode *mode, *t;
  44
  45         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  46                 return;
  47
  48         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  49                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  50                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  51                         mode->status = MODE_NO_INTERLACE;
  52                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  53                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  54                         mode->status = MODE_NO_DBLESCAN;
  55         }
  56
  57         return;
  58 }
  59
  60 /**
  61  * drm_helper_probe_single_connector_modes - get complete set of display modes
  62  * @dev: DRM device
  63  * @maxX: max width for modes
  64  * @maxY: max height for modes
  65  *
  66  * LOCKING:
  67  * Caller must hold mode config lock.
  68  *
  69  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  70  * modes on them.  Modes will first be added to the connector's probed_modes
  71  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  72  * put into the normal modes list.
  73  *
  74  * Intended to be used either at bootup time or when major configuration
  75  * changes have occurred.
  76  *
  77  * FIXME: take into account monitor limits
  78  *
  79  * RETURNS:
  80  * Number of modes found on @connector.
  81  */
  82 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  83                                             uint32_t maxX, uint32_t maxY)
  84 {
  85         struct drm_device *dev = connector->dev;
  86         struct drm_display_mode *mode, *t;
  87         struct drm_connector_helper_funcs *connector_funcs =
  88                 connector->helper_private;
  89         int count = 0;
  90         int mode_flags = 0;
  91
  92         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
  93                         drm_get_connector_name(connector));
  94         /* set all modes to the unverified state */
  95         list_for_each_entry_safe(mode, t, &connector->modes, head)
  96                 mode->status = MODE_UNVERIFIED;
  97
  98         if (connector->force) {
  99                 if (connector->force == DRM_FORCE_ON)
 100                         connector->status = connector_status_connected;
 101                 else
 102                         connector->status = connector_status_disconnected;
 103                 if (connector->funcs->force)
 104                         connector->funcs->force(connector);
 105         } else {
 106                 connector->status = connector->funcs->detect(connector, true);
 107                 drm_kms_helper_poll_enable(dev);
 108         }
 109
 110         if (connector->status == connector_status_disconnected) {
 111                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 112                         connector->base.id, drm_get_connector_name(connector));
 113                 drm_mode_connector_update_edid_property(connector, NULL);
 114                 goto prune;
 115         }
 116
 117         count = (*connector_funcs->get_modes)(connector);
 118         if (count == 0 && connector->status == connector_status_connected)
 119                 count = drm_add_modes_noedid(connector, 1024, 768);
 120         if (count == 0)
 121                 goto prune;
 122
 123         drm_mode_connector_list_update(connector);
 124
 125         if (maxX && maxY)
 126                 drm_mode_validate_size(dev, &connector->modes, maxX,
 127                                        maxY, 0);
 128
 129         if (connector->interlace_allowed)
 130                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 131         if (connector->doublescan_allowed)
 132                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 133         drm_mode_validate_flag(connector, mode_flags);
 134
 135         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 136                 if (mode->status == MODE_OK)
 137                         mode->status = connector_funcs->mode_valid(connector,
 138                                                                    mode);
 139         }
 140
 141 prune:
 142         drm_mode_prune_invalid(dev, &connector->modes, true);
 143
 144         if (list_empty(&connector->modes))
 145                 return 0;
 146
 147         drm_mode_sort(&connector->modes);
 148
 149         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 150                         drm_get_connector_name(connector));
 151         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 152                 mode->vrefresh = drm_mode_vrefresh(mode);
 153
 154                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 155                 drm_mode_debug_printmodeline(mode);
 156         }
 157
 158         return count;
 159 }
 160 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 161
 162 /**
 163  * drm_helper_encoder_in_use - check if a given encoder is in use
 164  * @encoder: encoder to check
 165  *
 166  * LOCKING:
 167  * Caller must hold mode config lock.
 168  *
 169  * Walk @encoders's DRM device's mode_config and see if it's in use.
 170  *
 171  * RETURNS:
 172  * True if @encoder is part of the mode_config, false otherwise.
 173  */
 174 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 175 {
 176         struct drm_connector *connector;
 177         struct drm_device *dev = encoder->dev;
 178         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 179                 if (connector->encoder == encoder)
 180                         return true;
 181         return false;
 182 }
 183 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 184
 185 /**
 186  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 187  * @crtc: CRTC to check
 188  *
 189  * LOCKING:
 190  * Caller must hold mode config lock.
 191  *
 192  * Walk @crtc's DRM device's mode_config and see if it's in use.
 193  *
 194  * RETURNS:
 195  * True if @crtc is part of the mode_config, false otherwise.
 196  */
 197 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 198 {
 199         struct drm_encoder *encoder;
 200         struct drm_device *dev = crtc->dev;
 201         /* FIXME: Locking around list access? */
 202         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 203                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 204                         return true;
 205         return false;
 206 }
 207 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 208
 209 static void
 210 drm_encoder_disable(struct drm_encoder *encoder)
 211 {
 212         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 213
 214         if (encoder_funcs->disable)
 215                 (*encoder_funcs->disable)(encoder);
 216         else
 217                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 218 }
 219
 220 /**
 221  * drm_helper_disable_unused_functions - disable unused objects
 222  * @dev: DRM device
 223  *
 224  * LOCKING:
 225  * Caller must hold mode config lock.
 226  *
 227  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 228  * by calling its dpms function, which should power it off.
 229  */
 230 void drm_helper_disable_unused_functions(struct drm_device *dev)
 231 {
 232         struct drm_encoder *encoder;
 233         struct drm_connector *connector;
 234         struct drm_crtc *crtc;
 235
 236         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 237                 if (!connector->encoder)
 238                         continue;
 239                 if (connector->status == connector_status_disconnected)
 240                         connector->encoder = NULL;
 241         }
 242
 243         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 244                 if (!drm_helper_encoder_in_use(encoder)) {
 245                         drm_encoder_disable(encoder);
 246                         /* disconnector encoder from any connector */
 247                         encoder->crtc = NULL;
 248                 }
 249         }
 250
 251         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 252                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 253                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 254                 if (!crtc->enabled) {
 255                         if (crtc_funcs->disable)
 256                                 (*crtc_funcs->disable)(crtc);
 257                         else
 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 /**
 266  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 267  * @encoder: encoder to test
 268  * @crtc: crtc to test
 269  *
 270  * Return false if @encoder can't be driven by @crtc, true otherwise.
 271  */
 272 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 273                                 struct drm_crtc *crtc)
 274 {
 275         struct drm_device *dev;
 276         struct drm_crtc *tmp;
 277         int crtc_mask = 1;
 278
 279         WARN(!crtc, "checking null crtc?\n");
 280
 281         dev = crtc->dev;
 282
 283         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 284                 if (tmp == crtc)
 285                         break;
 286                 crtc_mask <<= 1;
 287         }
 288
 289         if (encoder->possible_crtcs & crtc_mask)
 290                 return true;
 291         return false;
 292 }
 293
 294 /*
 295  * Check the CRTC we're going to map each output to vs. its current
 296  * CRTC.  If they don't match, we have to disable the output and the CRTC
 297  * since the driver will have to re-route things.
 298  */
 299 static void
 300 drm_crtc_prepare_encoders(struct drm_device *dev)
 301 {
 302         struct drm_encoder_helper_funcs *encoder_funcs;
 303         struct drm_encoder *encoder;
 304
 305         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 306                 encoder_funcs = encoder->helper_private;
 307                 /* Disable unused encoders */
 308                 if (encoder->crtc == NULL)
 309                         drm_encoder_disable(encoder);
 310                 /* Disable encoders whose CRTC is about to change */
 311                 if (encoder_funcs->get_crtc &&
 312                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 313                         drm_encoder_disable(encoder);
 314         }
 315 }
 316
 317 /**
 318  * drm_crtc_set_mode - set a mode
 319  * @crtc: CRTC to program
 320  * @mode: mode to use
 321  * @x: width of mode
 322  * @y: height of mode
 323  *
 324  * LOCKING:
 325  * Caller must hold mode config lock.
 326  *
 327  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 328  * to fixup or reject the mode prior to trying to set it.
 329  *
 330  * RETURNS:
 331  * True if the mode was set successfully, or false otherwise.
 332  */
 333 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 334                               struct drm_display_mode *mode,
 335                               int x, int y,
 336                               struct drm_framebuffer *old_fb)
 337 {
 338         struct drm_device *dev = crtc->dev;
 339         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 340         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 341         struct drm_encoder_helper_funcs *encoder_funcs;
 342         int saved_x, saved_y;
 343         struct drm_encoder *encoder;
 344         bool ret = true;
 345
 346         crtc->enabled = drm_helper_crtc_in_use(crtc);
 347         if (!crtc->enabled)
 348                 return true;
 349
 350         adjusted_mode = drm_mode_duplicate(dev, mode);
 351
 352         saved_hwmode = crtc->hwmode;
 353         saved_mode = crtc->mode;
 354         saved_x = crtc->x;
 355         saved_y = crtc->y;
 356
 357         /* Update crtc values up front so the driver can rely on them for mode
 358          * setting.
 359          */
 360         crtc->mode = *mode;
 361         crtc->x = x;
 362         crtc->y = y;
 363
 364         /* Pass our mode to the connectors and the CRTC to give them a chance to
 365          * adjust it according to limitations or connector properties, and also
 366          * a chance to reject the mode entirely.
 367          */
 368         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 369
 370                 if (encoder->crtc != crtc)
 371                         continue;
 372                 encoder_funcs = encoder->helper_private;
 373                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 374                                                       adjusted_mode))) {
 375                         goto done;
 376                 }
 377         }
 378
 379         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 380                 goto done;
 381         }
 382         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 383
 384         /* Prepare the encoders and CRTCs before setting the mode. */
 385         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 386
 387                 if (encoder->crtc != crtc)
 388                         continue;
 389                 encoder_funcs = encoder->helper_private;
 390                 /* Disable the encoders as the first thing we do. */
 391                 encoder_funcs->prepare(encoder);
 392         }
 393
 394         drm_crtc_prepare_encoders(dev);
 395
 396         crtc_funcs->prepare(crtc);
 397
 398         /* Set up the DPLL and any encoders state that needs to adjust or depend
 399          * on the DPLL.
 400          */
 401         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 402         if (!ret)
 403             goto done;
 404
 405         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 406
 407                 if (encoder->crtc != crtc)
 408                         continue;
 409
 410                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 411                         encoder->base.id, drm_get_encoder_name(encoder),
 412                         mode->base.id, mode->name);
 413                 encoder_funcs = encoder->helper_private;
 414                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 415         }
 416
 417         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 418         crtc_funcs->commit(crtc);
 419
 420         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 421
 422                 if (encoder->crtc != crtc)
 423                         continue;
 424
 425                 encoder_funcs = encoder->helper_private;
 426                 encoder_funcs->commit(encoder);
 427
 428         }
 429
 430         /* Store real post-adjustment hardware mode. */
 431         crtc->hwmode = *adjusted_mode;
 432
 433         /* Calculate and store various constants which
 434          * are later needed by vblank and swap-completion
 435          * timestamping. They are derived from true hwmode.
 436          */
 437         drm_calc_timestamping_constants(crtc);
 438
 439         /* FIXME: add subpixel order */
 440 done:
 441         drm_mode_destroy(dev, adjusted_mode);
 442         if (!ret) {
 443                 crtc->hwmode = saved_hwmode;
 444                 crtc->mode = saved_mode;
 445                 crtc->x = saved_x;
 446                 crtc->y = saved_y;
 447         }
 448
 449         return ret;
 450 }
 451 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 452
 453
 454 /**
 455  * drm_crtc_helper_set_config - set a new config from userspace
 456  * @crtc: CRTC to setup
 457  * @crtc_info: user provided configuration
 458  * @new_mode: new mode to set
 459  * @connector_set: set of connectors for the new config
 460  * @fb: new framebuffer
 461  *
 462  * LOCKING:
 463  * Caller must hold mode config lock.
 464  *
 465  * Setup a new configuration, provided by the user in @crtc_info, and enable
 466  * it.
 467  *
 468  * RETURNS:
 469  * Zero. (FIXME)
 470  */
 471 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 472 {
 473         struct drm_device *dev;
 474         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 475         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 476         struct drm_framebuffer *old_fb = NULL;
 477         bool mode_changed = false; /* if true do a full mode set */
 478         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 479         struct drm_connector *save_connectors, *connector;
 480         int count = 0, ro, fail = 0;
 481         struct drm_crtc_helper_funcs *crtc_funcs;
 482         int ret = 0;
 483         int i;
 484
 485         DRM_DEBUG_KMS("\n");
 486
 487         if (!set)
 488                 return -EINVAL;
 489
 490         if (!set->crtc)
 491                 return -EINVAL;
 492
 493         if (!set->crtc->helper_private)
 494                 return -EINVAL;
 495
 496         crtc_funcs = set->crtc->helper_private;
 497
 498         if (!set->mode)
 499                 set->fb = NULL;
 500
 501         if (set->fb) {
 502                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 503                                 set->crtc->base.id, set->fb->base.id,
 504                                 (int)set->num_connectors, set->x, set->y);
 505         } else {
 506                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 507                 set->mode = NULL;
 508                 set->num_connectors = 0;
 509         }
 510
 511         dev = set->crtc->dev;
 512
 513         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 514          * connector data. */
 515         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 516                              sizeof(struct drm_crtc), GFP_KERNEL);
 517         if (!save_crtcs)
 518                 return -ENOMEM;
 519
 520         save_encoders = kzalloc(dev->mode_config.num_encoder *
 521                                 sizeof(struct drm_encoder), GFP_KERNEL);
 522         if (!save_encoders) {
 523                 kfree(save_crtcs);
 524                 return -ENOMEM;
 525         }
 526
 527         save_connectors = kzalloc(dev->mode_config.num_connector *
 528                                 sizeof(struct drm_connector), GFP_KERNEL);
 529         if (!save_connectors) {
 530                 kfree(save_crtcs);
 531                 kfree(save_encoders);
 532                 return -ENOMEM;
 533         }
 534
 535         /* Copy data. Note that driver private data is not affected.
 536          * Should anything bad happen only the expected state is
 537          * restored, not the drivers personal bookkeeping.
 538          */
 539         count = 0;
 540         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 541                 save_crtcs[count++] = *crtc;
 542         }
 543
 544         count = 0;
 545         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 546                 save_encoders[count++] = *encoder;
 547         }
 548
 549         count = 0;
 550         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 551                 save_connectors[count++] = *connector;
 552         }
 553
 554         /* We should be able to check here if the fb has the same properties
 555          * and then just flip_or_move it */
 556         if (set->crtc->fb != set->fb) {
 557                 /* If we have no fb then treat it as a full mode set */
 558                 if (set->crtc->fb == NULL) {
 559                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 560                         mode_changed = true;
 561                 } else if (set->fb == NULL) {
 562                         mode_changed = true;
 563                 } else
 564                         fb_changed = true;
 565         }
 566
 567         if (set->x != set->crtc->x || set->y != set->crtc->y)
 568                 fb_changed = true;
 569
 570         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 571                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 572                 drm_mode_debug_printmodeline(&set->crtc->mode);
 573                 drm_mode_debug_printmodeline(set->mode);
 574                 mode_changed = true;
 575         }
 576
 577         /* a) traverse passed in connector list and get encoders for them */
 578         count = 0;
 579         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 580                 struct drm_connector_helper_funcs *connector_funcs =
 581                         connector->helper_private;
 582                 new_encoder = connector->encoder;
 583                 for (ro = 0; ro < set->num_connectors; ro++) {
 584                         if (set->connectors[ro] == connector) {
 585                                 new_encoder = connector_funcs->best_encoder(connector);
 586                                 /* if we can't get an encoder for a connector
 587                                    we are setting now - then fail */
 588                                 if (new_encoder == NULL)
 589                                         /* don't break so fail path works correct */
 590                                         fail = 1;
 591                                 break;
 592                         }
 593                 }
 594
 595                 if (new_encoder != connector->encoder) {
 596                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 597                         mode_changed = true;
 598                         /* If the encoder is reused for another connector, then
 599                          * the appropriate crtc will be set later.
 600                          */
 601                         if (connector->encoder)
 602                                 connector->encoder->crtc = NULL;
 603                         connector->encoder = new_encoder;
 604                 }
 605         }
 606
 607         if (fail) {
 608                 ret = -EINVAL;
 609                 goto fail;
 610         }
 611
 612         count = 0;
 613         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 614                 if (!connector->encoder)
 615                         continue;
 616
 617                 if (connector->encoder->crtc == set->crtc)
 618                         new_crtc = NULL;
 619                 else
 620                         new_crtc = connector->encoder->crtc;
 621
 622                 for (ro = 0; ro < set->num_connectors; ro++) {
 623                         if (set->connectors[ro] == connector)
 624                                 new_crtc = set->crtc;
 625                 }
 626
 627                 /* Make sure the new CRTC will work with the encoder */
 628                 if (new_crtc &&
 629                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 630                         ret = -EINVAL;
 631                         goto fail;
 632                 }
 633                 if (new_crtc != connector->encoder->crtc) {
 634                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 635                         mode_changed = true;
 636                         connector->encoder->crtc = new_crtc;
 637                 }
 638                 if (new_crtc) {
 639                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 640                                 connector->base.id, drm_get_connector_name(connector),
 641                                 new_crtc->base.id);
 642                 } else {
 643                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 644                                 connector->base.id, drm_get_connector_name(connector));
 645                 }
 646         }
 647
 648         /* mode_set_base is not a required function */
 649         if (fb_changed && !crtc_funcs->mode_set_base)
 650                 mode_changed = true;
 651
 652         if (mode_changed) {
 653                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 654                 if (set->crtc->enabled) {
 655                         DRM_DEBUG_KMS("attempting to set mode from"
 656                                         " userspace\n");
 657                         drm_mode_debug_printmodeline(set->mode);
 658                         old_fb = set->crtc->fb;
 659                         set->crtc->fb = set->fb;
 660                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 661                                                       set->x, set->y,
 662                                                       old_fb)) {
 663                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 664                                           set->crtc->base.id);
 665                                 set->crtc->fb = old_fb;
 666                                 ret = -EINVAL;
 667                                 goto fail;
 668                         }
 669                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 670                         for (i = 0; i < set->num_connectors; i++) {
 671                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 672                                               drm_get_connector_name(set->connectors[i]));
 673                                 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
 674                         }
 675                 }
 676                 drm_helper_disable_unused_functions(dev);
 677         } else if (fb_changed) {
 678                 set->crtc->x = set->x;
 679                 set->crtc->y = set->y;
 680
 681                 old_fb = set->crtc->fb;
 682                 if (set->crtc->fb != set->fb)
 683                         set->crtc->fb = set->fb;
 684                 ret = crtc_funcs->mode_set_base(set->crtc,
 685                                                 set->x, set->y, old_fb);
 686                 if (ret != 0) {
 687                         set->crtc->fb = old_fb;
 688                         goto fail;
 689                 }
 690         }
 691
 692         kfree(save_connectors);
 693         kfree(save_encoders);
 694         kfree(save_crtcs);
 695         return 0;
 696
 697 fail:
 698         /* Restore all previous data. */
 699         count = 0;
 700         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 701                 *crtc = save_crtcs[count++];
 702         }
 703
 704         count = 0;
 705         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 706                 *encoder = save_encoders[count++];
 707         }
 708
 709         count = 0;
 710         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 711                 *connector = save_connectors[count++];
 712         }
 713
 714         kfree(save_connectors);
 715         kfree(save_encoders);
 716         kfree(save_crtcs);
 717         return ret;
 718 }
 719 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 720
 721 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 722 {
 723         int dpms = DRM_MODE_DPMS_OFF;
 724         struct drm_connector *connector;
 725         struct drm_device *dev = encoder->dev;
 726
 727         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 728                 if (connector->encoder == encoder)
 729                         if (connector->dpms < dpms)
 730                                 dpms = connector->dpms;
 731         return dpms;
 732 }
 733
 734 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 735 {
 736         int dpms = DRM_MODE_DPMS_OFF;
 737         struct drm_connector *connector;
 738         struct drm_device *dev = crtc->dev;
 739
 740         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 741                 if (connector->encoder && connector->encoder->crtc == crtc)
 742                         if (connector->dpms < dpms)
 743                                 dpms = connector->dpms;
 744         return dpms;
 745 }
 746
 747 /**
 748  * drm_helper_connector_dpms
 749  * @connector affected connector
 750  * @mode DPMS mode
 751  *
 752  * Calls the low-level connector DPMS function, then
 753  * calls appropriate encoder and crtc DPMS functions as well
 754  */
 755 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 756 {
 757         struct drm_encoder *encoder = connector->encoder;
 758         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 759         int old_dpms;
 760
 761         if (mode == connector->dpms)
 762                 return;
 763
 764         old_dpms = connector->dpms;
 765         connector->dpms = mode;
 766
 767         /* from off to on, do crtc then encoder */
 768         if (mode < old_dpms) {
 769                 if (crtc) {
 770                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 771                         if (crtc_funcs->dpms)
 772                                 (*crtc_funcs->dpms) (crtc,
 773                                                      drm_helper_choose_crtc_dpms(crtc));
 774                 }
 775                 if (encoder) {
 776                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 777                         if (encoder_funcs->dpms)
 778                                 (*encoder_funcs->dpms) (encoder,
 779                                                         drm_helper_choose_encoder_dpms(encoder));
 780                 }
 781         }
 782
 783         /* from on to off, do encoder then crtc */
 784         if (mode > old_dpms) {
 785                 if (encoder) {
 786                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 787                         if (encoder_funcs->dpms)
 788                                 (*encoder_funcs->dpms) (encoder,
 789                                                         drm_helper_choose_encoder_dpms(encoder));
 790                 }
 791                 if (crtc) {
 792                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 793                         if (crtc_funcs->dpms)
 794                                 (*crtc_funcs->dpms) (crtc,
 795                                                      drm_helper_choose_crtc_dpms(crtc));
 796                 }
 797         }
 798
 799         return;
 800 }
 801 EXPORT_SYMBOL(drm_helper_connector_dpms);
 802
 803 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 804                                    struct drm_mode_fb_cmd *mode_cmd)
 805 {
 806         fb->width = mode_cmd->width;
 807         fb->height = mode_cmd->height;
 808         fb->pitch = mode_cmd->pitch;
 809         fb->bits_per_pixel = mode_cmd->bpp;
 810         fb->depth = mode_cmd->depth;
 811
 812         return 0;
 813 }
 814 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 815
 816 int drm_helper_resume_force_mode(struct drm_device *dev)
 817 {
 818         struct drm_crtc *crtc;
 819         struct drm_encoder *encoder;
 820         struct drm_encoder_helper_funcs *encoder_funcs;
 821         struct drm_crtc_helper_funcs *crtc_funcs;
 822         int ret;
 823
 824         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 825
 826                 if (!crtc->enabled)
 827                         continue;
 828
 829                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 830                                                crtc->x, crtc->y, crtc->fb);
 831
 832                 if (ret == false)
 833                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 834
 835                 /* Turn off outputs that were already powered off */
 836                 if (drm_helper_choose_crtc_dpms(crtc)) {
 837                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 838
 839                                 if(encoder->crtc != crtc)
 840                                         continue;
 841
 842                                 encoder_funcs = encoder->helper_private;
 843                                 if (encoder_funcs->dpms)
 844                                         (*encoder_funcs->dpms) (encoder,
 845                                                                 drm_helper_choose_encoder_dpms(encoder));
 846                         }
 847
 848                         crtc_funcs = crtc->helper_private;
 849                         if (crtc_funcs->dpms)
 850                                 (*crtc_funcs->dpms) (crtc,
 851                                                      drm_helper_choose_crtc_dpms(crtc));
 852                 }
 853         }
 854         /* disable the unused connectors while restoring the modesetting */
 855         drm_helper_disable_unused_functions(dev);
 856         return 0;
 857 }
 858 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 859
 860 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 861 static void output_poll_execute(struct work_struct *work)
 862 {
 863         struct delayed_work *delayed_work = to_delayed_work(work);
 864         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 865         struct drm_connector *connector;
 866         enum drm_connector_status old_status;
 867         bool repoll = false, changed = false;
 868
 869         if (!drm_kms_helper_poll)
 870                 return;
 871
 872         mutex_lock(&dev->mode_config.mutex);
 873         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 874
 875                 /* if this is HPD or polled don't check it -
 876                    TV out for instance */
 877                 if (!connector->polled)
 878                         continue;
 879
 880                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
 881                         repoll = true;
 882
 883                 old_status = connector->status;
 884                 /* if we are connected and don't want to poll for disconnect
 885                    skip it */
 886                 if (old_status == connector_status_connected &&
 887                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 888                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 889                         continue;
 890
 891                 connector->status = connector->funcs->detect(connector, false);
 892                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 893                               connector->base.id,
 894                               drm_get_connector_name(connector),
 895                               old_status, connector->status);
 896                 if (old_status != connector->status)
 897                         changed = true;
 898         }
 899
 900         mutex_unlock(&dev->mode_config.mutex);
 901
 902         if (changed) {
 903                 /* send a uevent + call fbdev */
 904                 drm_sysfs_hotplug_event(dev);
 905                 if (dev->mode_config.funcs->output_poll_changed)
 906                         dev->mode_config.funcs->output_poll_changed(dev);
 907         }
 908
 909         if (repoll)
 910                 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
 911 }
 912
 913 void drm_kms_helper_poll_disable(struct drm_device *dev)
 914 {
 915         if (!dev->mode_config.poll_enabled)
 916                 return;
 917         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
 918 }
 919 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 920
 921 void drm_kms_helper_poll_enable(struct drm_device *dev)
 922 {
 923         bool poll = false;
 924         struct drm_connector *connector;
 925
 926         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
 927                 return;
 928
 929         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 930                 if (connector->polled)
 931                         poll = true;
 932         }
 933
 934         if (poll)
 935                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
 936 }
 937 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
 938
 939 void drm_kms_helper_poll_init(struct drm_device *dev)
 940 {
 941         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
 942         dev->mode_config.poll_enabled = true;
 943
 944         drm_kms_helper_poll_enable(dev);
 945 }
 946 EXPORT_SYMBOL(drm_kms_helper_poll_init);
 947
 948 void drm_kms_helper_poll_fini(struct drm_device *dev)
 949 {
 950         drm_kms_helper_poll_disable(dev);
 951 }
 952 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
 953
 954 void drm_helper_hpd_irq_event(struct drm_device *dev)
 955 {
 956         if (!dev->mode_config.poll_enabled)
 957                 return;
 958
 959         /* kill timer and schedule immediate execution, this doesn't block */
 960         cancel_delayed_work(&dev->mode_config.output_poll_work);
 961         if (drm_kms_helper_poll)
 962                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
 963 }
 964 EXPORT_SYMBOL(drm_helper_hpd_irq_event);