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 <linux/export.h>
  33
  34 #include "drmP.h"
  35 #include "drm_crtc.h"
  36 #include "drm_crtc_helper.h"
  37 #include "drm_fb_helper.h"
  38
  39 static bool drm_kms_helper_poll = true;
  40 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  41
  42 static void drm_mode_validate_flag(struct drm_connector *connector,
  43                                    int flags)
  44 {
  45         struct drm_display_mode *mode, *t;
  46
  47         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  48                 return;
  49
  50         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  51                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  52                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  53                         mode->status = MODE_NO_INTERLACE;
  54                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  55                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  56                         mode->status = MODE_NO_DBLESCAN;
  57         }
  58
  59         return;
  60 }
  61
  62 /**
  63  * drm_helper_probe_single_connector_modes - get complete set of display modes
  64  * @dev: DRM device
  65  * @maxX: max width for modes
  66  * @maxY: max height for modes
  67  *
  68  * LOCKING:
  69  * Caller must hold mode config lock.
  70  *
  71  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  72  * modes on them.  Modes will first be added to the connector's probed_modes
  73  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  74  * put into the normal modes list.
  75  *
  76  * Intended to be used either at bootup time or when major configuration
  77  * changes have occurred.
  78  *
  79  * FIXME: take into account monitor limits
  80  *
  81  * RETURNS:
  82  * Number of modes found on @connector.
  83  */
  84 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  85                                             uint32_t maxX, uint32_t maxY)
  86 {
  87         struct drm_device *dev = connector->dev;
  88         struct drm_display_mode *mode, *t;
  89         struct drm_connector_helper_funcs *connector_funcs =
  90                 connector->helper_private;
  91         int count = 0;
  92         int mode_flags = 0;
  93
  94         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
  95                         drm_get_connector_name(connector));
  96         /* set all modes to the unverified state */
  97         list_for_each_entry_safe(mode, t, &connector->modes, head)
  98                 mode->status = MODE_UNVERIFIED;
  99
 100         if (connector->force) {
 101                 if (connector->force == DRM_FORCE_ON)
 102                         connector->status = connector_status_connected;
 103                 else
 104                         connector->status = connector_status_disconnected;
 105                 if (connector->funcs->force)
 106                         connector->funcs->force(connector);
 107         } else {
 108                 connector->status = connector->funcs->detect(connector, true);
 109                 drm_kms_helper_poll_enable(dev);
 110         }
 111
 112         if (connector->status == connector_status_disconnected) {
 113                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 114                         connector->base.id, drm_get_connector_name(connector));
 115                 drm_mode_connector_update_edid_property(connector, NULL);
 116                 goto prune;
 117         }
 118
 119         count = (*connector_funcs->get_modes)(connector);
 120         if (count == 0 && connector->status == connector_status_connected)
 121                 count = drm_add_modes_noedid(connector, 1024, 768);
 122         if (count == 0)
 123                 goto prune;
 124
 125         drm_mode_connector_list_update(connector);
 126
 127         if (maxX && maxY)
 128                 drm_mode_validate_size(dev, &connector->modes, maxX,
 129                                        maxY, 0);
 130
 131         if (connector->interlace_allowed)
 132                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 133         if (connector->doublescan_allowed)
 134                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 135         drm_mode_validate_flag(connector, mode_flags);
 136
 137         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 138                 if (mode->status == MODE_OK)
 139                         mode->status = connector_funcs->mode_valid(connector,
 140                                                                    mode);
 141         }
 142
 143 prune:
 144         drm_mode_prune_invalid(dev, &connector->modes, true);
 145
 146         if (list_empty(&connector->modes))
 147                 return 0;
 148
 149         drm_mode_sort(&connector->modes);
 150
 151         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 152                         drm_get_connector_name(connector));
 153         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 154                 mode->vrefresh = drm_mode_vrefresh(mode);
 155
 156                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 157                 drm_mode_debug_printmodeline(mode);
 158         }
 159
 160         return count;
 161 }
 162 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 163
 164 /**
 165  * drm_helper_encoder_in_use - check if a given encoder is in use
 166  * @encoder: encoder to check
 167  *
 168  * LOCKING:
 169  * Caller must hold mode config lock.
 170  *
 171  * Walk @encoders's DRM device's mode_config and see if it's in use.
 172  *
 173  * RETURNS:
 174  * True if @encoder is part of the mode_config, false otherwise.
 175  */
 176 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 177 {
 178         struct drm_connector *connector;
 179         struct drm_device *dev = encoder->dev;
 180         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 181                 if (connector->encoder == encoder)
 182                         return true;
 183         return false;
 184 }
 185 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 186
 187 /**
 188  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 189  * @crtc: CRTC to check
 190  *
 191  * LOCKING:
 192  * Caller must hold mode config lock.
 193  *
 194  * Walk @crtc's DRM device's mode_config and see if it's in use.
 195  *
 196  * RETURNS:
 197  * True if @crtc is part of the mode_config, false otherwise.
 198  */
 199 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 200 {
 201         struct drm_encoder *encoder;
 202         struct drm_device *dev = crtc->dev;
 203         /* FIXME: Locking around list access? */
 204         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 205                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 206                         return true;
 207         return false;
 208 }
 209 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 210
 211 static void
 212 drm_encoder_disable(struct drm_encoder *encoder)
 213 {
 214         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 215
 216         if (encoder_funcs->disable)
 217                 (*encoder_funcs->disable)(encoder);
 218         else
 219                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 220 }
 221
 222 /**
 223  * drm_helper_disable_unused_functions - disable unused objects
 224  * @dev: DRM device
 225  *
 226  * LOCKING:
 227  * Caller must hold mode config lock.
 228  *
 229  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 230  * by calling its dpms function, which should power it off.
 231  */
 232 void drm_helper_disable_unused_functions(struct drm_device *dev)
 233 {
 234         struct drm_encoder *encoder;
 235         struct drm_connector *connector;
 236         struct drm_crtc *crtc;
 237
 238         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 239                 if (!connector->encoder)
 240                         continue;
 241                 if (connector->status == connector_status_disconnected)
 242                         connector->encoder = NULL;
 243         }
 244
 245         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 246                 if (!drm_helper_encoder_in_use(encoder)) {
 247                         drm_encoder_disable(encoder);
 248                         /* disconnector encoder from any connector */
 249                         encoder->crtc = NULL;
 250                 }
 251         }
 252
 253         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 254                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 255                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 256                 if (!crtc->enabled) {
 257                         if (crtc_funcs->disable)
 258                                 (*crtc_funcs->disable)(crtc);
 259                         else
 260                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 261                         crtc->fb = NULL;
 262                 }
 263         }
 264 }
 265 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 266
 267 /**
 268  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 269  * @encoder: encoder to test
 270  * @crtc: crtc to test
 271  *
 272  * Return false if @encoder can't be driven by @crtc, true otherwise.
 273  */
 274 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 275                                 struct drm_crtc *crtc)
 276 {
 277         struct drm_device *dev;
 278         struct drm_crtc *tmp;
 279         int crtc_mask = 1;
 280
 281         WARN(!crtc, "checking null crtc?\n");
 282
 283         dev = crtc->dev;
 284
 285         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 286                 if (tmp == crtc)
 287                         break;
 288                 crtc_mask <<= 1;
 289         }
 290
 291         if (encoder->possible_crtcs & crtc_mask)
 292                 return true;
 293         return false;
 294 }
 295
 296 /*
 297  * Check the CRTC we're going to map each output to vs. its current
 298  * CRTC.  If they don't match, we have to disable the output and the CRTC
 299  * since the driver will have to re-route things.
 300  */
 301 static void
 302 drm_crtc_prepare_encoders(struct drm_device *dev)
 303 {
 304         struct drm_encoder_helper_funcs *encoder_funcs;
 305         struct drm_encoder *encoder;
 306
 307         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 308                 encoder_funcs = encoder->helper_private;
 309                 /* Disable unused encoders */
 310                 if (encoder->crtc == NULL)
 311                         drm_encoder_disable(encoder);
 312                 /* Disable encoders whose CRTC is about to change */
 313                 if (encoder_funcs->get_crtc &&
 314                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 315                         drm_encoder_disable(encoder);
 316         }
 317 }
 318
 319 /**
 320  * drm_crtc_set_mode - set a mode
 321  * @crtc: CRTC to program
 322  * @mode: mode to use
 323  * @x: width of mode
 324  * @y: height of mode
 325  *
 326  * LOCKING:
 327  * Caller must hold mode config lock.
 328  *
 329  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 330  * to fixup or reject the mode prior to trying to set it.
 331  *
 332  * RETURNS:
 333  * True if the mode was set successfully, or false otherwise.
 334  */
 335 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 336                               struct drm_display_mode *mode,
 337                               int x, int y,
 338                               struct drm_framebuffer *old_fb)
 339 {
 340         struct drm_device *dev = crtc->dev;
 341         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 342         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 343         struct drm_encoder_helper_funcs *encoder_funcs;
 344         int saved_x, saved_y;
 345         struct drm_encoder *encoder;
 346         bool ret = true;
 347
 348         crtc->enabled = drm_helper_crtc_in_use(crtc);
 349         if (!crtc->enabled)
 350                 return true;
 351
 352         adjusted_mode = drm_mode_duplicate(dev, mode);
 353
 354         saved_hwmode = crtc->hwmode;
 355         saved_mode = crtc->mode;
 356         saved_x = crtc->x;
 357         saved_y = crtc->y;
 358
 359         /* Update crtc values up front so the driver can rely on them for mode
 360          * setting.
 361          */
 362         crtc->mode = *mode;
 363         crtc->x = x;
 364         crtc->y = y;
 365
 366         /* Pass our mode to the connectors and the CRTC to give them a chance to
 367          * adjust it according to limitations or connector properties, and also
 368          * a chance to reject the mode entirely.
 369          */
 370         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 371
 372                 if (encoder->crtc != crtc)
 373                         continue;
 374                 encoder_funcs = encoder->helper_private;
 375                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 376                                                       adjusted_mode))) {
 377                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 378                         goto done;
 379                 }
 380         }
 381
 382         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 383                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 384                 goto done;
 385         }
 386         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 387
 388         /* Prepare the encoders and CRTCs before setting the mode. */
 389         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 390
 391                 if (encoder->crtc != crtc)
 392                         continue;
 393                 encoder_funcs = encoder->helper_private;
 394                 /* Disable the encoders as the first thing we do. */
 395                 encoder_funcs->prepare(encoder);
 396         }
 397
 398         drm_crtc_prepare_encoders(dev);
 399
 400         crtc_funcs->prepare(crtc);
 401
 402         /* Set up the DPLL and any encoders state that needs to adjust or depend
 403          * on the DPLL.
 404          */
 405         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 406         if (!ret)
 407             goto done;
 408
 409         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 410
 411                 if (encoder->crtc != crtc)
 412                         continue;
 413
 414                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 415                         encoder->base.id, drm_get_encoder_name(encoder),
 416                         mode->base.id, mode->name);
 417                 encoder_funcs = encoder->helper_private;
 418                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 419         }
 420
 421         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 422         crtc_funcs->commit(crtc);
 423
 424         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 425
 426                 if (encoder->crtc != crtc)
 427                         continue;
 428
 429                 encoder_funcs = encoder->helper_private;
 430                 encoder_funcs->commit(encoder);
 431
 432         }
 433
 434         /* Store real post-adjustment hardware mode. */
 435         crtc->hwmode = *adjusted_mode;
 436
 437         /* Calculate and store various constants which
 438          * are later needed by vblank and swap-completion
 439          * timestamping. They are derived from true hwmode.
 440          */
 441         drm_calc_timestamping_constants(crtc);
 442
 443         /* FIXME: add subpixel order */
 444 done:
 445         drm_mode_destroy(dev, adjusted_mode);
 446         if (!ret) {
 447                 crtc->hwmode = saved_hwmode;
 448                 crtc->mode = saved_mode;
 449                 crtc->x = saved_x;
 450                 crtc->y = saved_y;
 451         }
 452
 453         return ret;
 454 }
 455 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 456
 457
 458 /**
 459  * drm_crtc_helper_set_config - set a new config from userspace
 460  * @crtc: CRTC to setup
 461  * @crtc_info: user provided configuration
 462  * @new_mode: new mode to set
 463  * @connector_set: set of connectors for the new config
 464  * @fb: new framebuffer
 465  *
 466  * LOCKING:
 467  * Caller must hold mode config lock.
 468  *
 469  * Setup a new configuration, provided by the user in @crtc_info, and enable
 470  * it.
 471  *
 472  * RETURNS:
 473  * Zero. (FIXME)
 474  */
 475 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 476 {
 477         struct drm_device *dev;
 478         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 479         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 480         struct drm_framebuffer *old_fb = NULL;
 481         bool mode_changed = false; /* if true do a full mode set */
 482         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 483         struct drm_connector *save_connectors, *connector;
 484         int count = 0, ro, fail = 0;
 485         struct drm_crtc_helper_funcs *crtc_funcs;
 486         int ret = 0;
 487         int i;
 488
 489         DRM_DEBUG_KMS("\n");
 490
 491         if (!set)
 492                 return -EINVAL;
 493
 494         if (!set->crtc)
 495                 return -EINVAL;
 496
 497         if (!set->crtc->helper_private)
 498                 return -EINVAL;
 499
 500         crtc_funcs = set->crtc->helper_private;
 501
 502         if (!set->mode)
 503                 set->fb = NULL;
 504
 505         if (set->fb) {
 506                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 507                                 set->crtc->base.id, set->fb->base.id,
 508                                 (int)set->num_connectors, set->x, set->y);
 509         } else {
 510                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 511                 set->mode = NULL;
 512                 set->num_connectors = 0;
 513         }
 514
 515         dev = set->crtc->dev;
 516
 517         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 518          * connector data. */
 519         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 520                              sizeof(struct drm_crtc), GFP_KERNEL);
 521         if (!save_crtcs)
 522                 return -ENOMEM;
 523
 524         save_encoders = kzalloc(dev->mode_config.num_encoder *
 525                                 sizeof(struct drm_encoder), GFP_KERNEL);
 526         if (!save_encoders) {
 527                 kfree(save_crtcs);
 528                 return -ENOMEM;
 529         }
 530
 531         save_connectors = kzalloc(dev->mode_config.num_connector *
 532                                 sizeof(struct drm_connector), GFP_KERNEL);
 533         if (!save_connectors) {
 534                 kfree(save_crtcs);
 535                 kfree(save_encoders);
 536                 return -ENOMEM;
 537         }
 538
 539         /* Copy data. Note that driver private data is not affected.
 540          * Should anything bad happen only the expected state is
 541          * restored, not the drivers personal bookkeeping.
 542          */
 543         count = 0;
 544         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 545                 save_crtcs[count++] = *crtc;
 546         }
 547
 548         count = 0;
 549         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 550                 save_encoders[count++] = *encoder;
 551         }
 552
 553         count = 0;
 554         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 555                 save_connectors[count++] = *connector;
 556         }
 557
 558         /* We should be able to check here if the fb has the same properties
 559          * and then just flip_or_move it */
 560         if (set->crtc->fb != set->fb) {
 561                 /* If we have no fb then treat it as a full mode set */
 562                 if (set->crtc->fb == NULL) {
 563                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 564                         mode_changed = true;
 565                 } else if (set->fb == NULL) {
 566                         mode_changed = true;
 567                 } else if (set->fb->depth != set->crtc->fb->depth) {
 568                         mode_changed = true;
 569                 } else if (set->fb->bits_per_pixel !=
 570                            set->crtc->fb->bits_per_pixel) {
 571                         mode_changed = true;
 572                 } else
 573                         fb_changed = true;
 574         }
 575
 576         if (set->x != set->crtc->x || set->y != set->crtc->y)
 577                 fb_changed = true;
 578
 579         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 580                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 581                 drm_mode_debug_printmodeline(&set->crtc->mode);
 582                 drm_mode_debug_printmodeline(set->mode);
 583                 mode_changed = true;
 584         }
 585
 586         /* a) traverse passed in connector list and get encoders for them */
 587         count = 0;
 588         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 589                 struct drm_connector_helper_funcs *connector_funcs =
 590                         connector->helper_private;
 591                 new_encoder = connector->encoder;
 592                 for (ro = 0; ro < set->num_connectors; ro++) {
 593                         if (set->connectors[ro] == connector) {
 594                                 new_encoder = connector_funcs->best_encoder(connector);
 595                                 /* if we can't get an encoder for a connector
 596                                    we are setting now - then fail */
 597                                 if (new_encoder == NULL)
 598                                         /* don't break so fail path works correct */
 599                                         fail = 1;
 600                                 break;
 601                         }
 602                 }
 603
 604                 if (new_encoder != connector->encoder) {
 605                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 606                         mode_changed = true;
 607                         /* If the encoder is reused for another connector, then
 608                          * the appropriate crtc will be set later.
 609                          */
 610                         if (connector->encoder)
 611                                 connector->encoder->crtc = NULL;
 612                         connector->encoder = new_encoder;
 613                 }
 614         }
 615
 616         if (fail) {
 617                 ret = -EINVAL;
 618                 goto fail;
 619         }
 620
 621         count = 0;
 622         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 623                 if (!connector->encoder)
 624                         continue;
 625
 626                 if (connector->encoder->crtc == set->crtc)
 627                         new_crtc = NULL;
 628                 else
 629                         new_crtc = connector->encoder->crtc;
 630
 631                 for (ro = 0; ro < set->num_connectors; ro++) {
 632                         if (set->connectors[ro] == connector)
 633                                 new_crtc = set->crtc;
 634                 }
 635
 636                 /* Make sure the new CRTC will work with the encoder */
 637                 if (new_crtc &&
 638                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 639                         ret = -EINVAL;
 640                         goto fail;
 641                 }
 642                 if (new_crtc != connector->encoder->crtc) {
 643                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 644                         mode_changed = true;
 645                         connector->encoder->crtc = new_crtc;
 646                 }
 647                 if (new_crtc) {
 648                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 649                                 connector->base.id, drm_get_connector_name(connector),
 650                                 new_crtc->base.id);
 651                 } else {
 652                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 653                                 connector->base.id, drm_get_connector_name(connector));
 654                 }
 655         }
 656
 657         /* mode_set_base is not a required function */
 658         if (fb_changed && !crtc_funcs->mode_set_base)
 659                 mode_changed = true;
 660
 661         if (mode_changed) {
 662                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 663                 if (set->crtc->enabled) {
 664                         DRM_DEBUG_KMS("attempting to set mode from"
 665                                         " userspace\n");
 666                         drm_mode_debug_printmodeline(set->mode);
 667                         old_fb = set->crtc->fb;
 668                         set->crtc->fb = set->fb;
 669                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 670                                                       set->x, set->y,
 671                                                       old_fb)) {
 672                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 673                                           set->crtc->base.id);
 674                                 set->crtc->fb = old_fb;
 675                                 ret = -EINVAL;
 676                                 goto fail;
 677                         }
 678                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 679                         for (i = 0; i < set->num_connectors; i++) {
 680                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 681                                               drm_get_connector_name(set->connectors[i]));
 682                                 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
 683                         }
 684                 }
 685                 drm_helper_disable_unused_functions(dev);
 686         } else if (fb_changed) {
 687                 set->crtc->x = set->x;
 688                 set->crtc->y = set->y;
 689
 690                 old_fb = set->crtc->fb;
 691                 if (set->crtc->fb != set->fb)
 692                         set->crtc->fb = set->fb;
 693                 ret = crtc_funcs->mode_set_base(set->crtc,
 694                                                 set->x, set->y, old_fb);
 695                 if (ret != 0) {
 696                         set->crtc->fb = old_fb;
 697                         goto fail;
 698                 }
 699         }
 700
 701         kfree(save_connectors);
 702         kfree(save_encoders);
 703         kfree(save_crtcs);
 704         return 0;
 705
 706 fail:
 707         /* Restore all previous data. */
 708         count = 0;
 709         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 710                 *crtc = save_crtcs[count++];
 711         }
 712
 713         count = 0;
 714         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 715                 *encoder = save_encoders[count++];
 716         }
 717
 718         count = 0;
 719         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 720                 *connector = save_connectors[count++];
 721         }
 722
 723         kfree(save_connectors);
 724         kfree(save_encoders);
 725         kfree(save_crtcs);
 726         return ret;
 727 }
 728 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 729
 730 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 731 {
 732         int dpms = DRM_MODE_DPMS_OFF;
 733         struct drm_connector *connector;
 734         struct drm_device *dev = encoder->dev;
 735
 736         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 737                 if (connector->encoder == encoder)
 738                         if (connector->dpms < dpms)
 739                                 dpms = connector->dpms;
 740         return dpms;
 741 }
 742
 743 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 744 {
 745         int dpms = DRM_MODE_DPMS_OFF;
 746         struct drm_connector *connector;
 747         struct drm_device *dev = crtc->dev;
 748
 749         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 750                 if (connector->encoder && connector->encoder->crtc == crtc)
 751                         if (connector->dpms < dpms)
 752                                 dpms = connector->dpms;
 753         return dpms;
 754 }
 755
 756 /**
 757  * drm_helper_connector_dpms
 758  * @connector affected connector
 759  * @mode DPMS mode
 760  *
 761  * Calls the low-level connector DPMS function, then
 762  * calls appropriate encoder and crtc DPMS functions as well
 763  */
 764 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 765 {
 766         struct drm_encoder *encoder = connector->encoder;
 767         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 768         int old_dpms;
 769
 770         if (mode == connector->dpms)
 771                 return;
 772
 773         old_dpms = connector->dpms;
 774         connector->dpms = mode;
 775
 776         /* from off to on, do crtc then encoder */
 777         if (mode < old_dpms) {
 778                 if (crtc) {
 779                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 780                         if (crtc_funcs->dpms)
 781                                 (*crtc_funcs->dpms) (crtc,
 782                                                      drm_helper_choose_crtc_dpms(crtc));
 783                 }
 784                 if (encoder) {
 785                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 786                         if (encoder_funcs->dpms)
 787                                 (*encoder_funcs->dpms) (encoder,
 788                                                         drm_helper_choose_encoder_dpms(encoder));
 789                 }
 790         }
 791
 792         /* from on to off, do encoder then crtc */
 793         if (mode > old_dpms) {
 794                 if (encoder) {
 795                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 796                         if (encoder_funcs->dpms)
 797                                 (*encoder_funcs->dpms) (encoder,
 798                                                         drm_helper_choose_encoder_dpms(encoder));
 799                 }
 800                 if (crtc) {
 801                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 802                         if (crtc_funcs->dpms)
 803                                 (*crtc_funcs->dpms) (crtc,
 804                                                      drm_helper_choose_crtc_dpms(crtc));
 805                 }
 806         }
 807
 808         return;
 809 }
 810 EXPORT_SYMBOL(drm_helper_connector_dpms);
 811
 812 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 813                                    struct drm_mode_fb_cmd *mode_cmd)
 814 {
 815         fb->width = mode_cmd->width;
 816         fb->height = mode_cmd->height;
 817         fb->pitch = mode_cmd->pitch;
 818         fb->bits_per_pixel = mode_cmd->bpp;
 819         fb->depth = mode_cmd->depth;
 820
 821         return 0;
 822 }
 823 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 824
 825 int drm_helper_resume_force_mode(struct drm_device *dev)
 826 {
 827         struct drm_crtc *crtc;
 828         struct drm_encoder *encoder;
 829         struct drm_encoder_helper_funcs *encoder_funcs;
 830         struct drm_crtc_helper_funcs *crtc_funcs;
 831         int ret;
 832
 833         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 834
 835                 if (!crtc->enabled)
 836                         continue;
 837
 838                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 839                                                crtc->x, crtc->y, crtc->fb);
 840
 841                 if (ret == false)
 842                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 843
 844                 /* Turn off outputs that were already powered off */
 845                 if (drm_helper_choose_crtc_dpms(crtc)) {
 846                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 847
 848                                 if(encoder->crtc != crtc)
 849                                         continue;
 850
 851                                 encoder_funcs = encoder->helper_private;
 852                                 if (encoder_funcs->dpms)
 853                                         (*encoder_funcs->dpms) (encoder,
 854                                                                 drm_helper_choose_encoder_dpms(encoder));
 855                         }
 856
 857                         crtc_funcs = crtc->helper_private;
 858                         if (crtc_funcs->dpms)
 859                                 (*crtc_funcs->dpms) (crtc,
 860                                                      drm_helper_choose_crtc_dpms(crtc));
 861                 }
 862         }
 863         /* disable the unused connectors while restoring the modesetting */
 864         drm_helper_disable_unused_functions(dev);
 865         return 0;
 866 }
 867 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 868
 869 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 870 static void output_poll_execute(struct work_struct *work)
 871 {
 872         struct delayed_work *delayed_work = to_delayed_work(work);
 873         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 874         struct drm_connector *connector;
 875         enum drm_connector_status old_status;
 876         bool repoll = false, changed = false;
 877
 878         if (!drm_kms_helper_poll)
 879                 return;
 880
 881         mutex_lock(&dev->mode_config.mutex);
 882         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 883
 884                 /* if this is HPD or polled don't check it -
 885                    TV out for instance */
 886                 if (!connector->polled)
 887                         continue;
 888
 889                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
 890                         repoll = true;
 891
 892                 old_status = connector->status;
 893                 /* if we are connected and don't want to poll for disconnect
 894                    skip it */
 895                 if (old_status == connector_status_connected &&
 896                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 897                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 898                         continue;
 899
 900                 connector->status = connector->funcs->detect(connector, false);
 901                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 902                               connector->base.id,
 903                               drm_get_connector_name(connector),
 904                               old_status, connector->status);
 905                 if (old_status != connector->status)
 906                         changed = true;
 907         }
 908
 909         mutex_unlock(&dev->mode_config.mutex);
 910
 911         if (changed) {
 912                 /* send a uevent + call fbdev */
 913                 drm_sysfs_hotplug_event(dev);
 914                 if (dev->mode_config.funcs->output_poll_changed)
 915                         dev->mode_config.funcs->output_poll_changed(dev);
 916         }
 917
 918         if (repoll)
 919                 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
 920 }
 921
 922 void drm_kms_helper_poll_disable(struct drm_device *dev)
 923 {
 924         if (!dev->mode_config.poll_enabled)
 925                 return;
 926         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
 927 }
 928 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 929
 930 void drm_kms_helper_poll_enable(struct drm_device *dev)
 931 {
 932         bool poll = false;
 933         struct drm_connector *connector;
 934
 935         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
 936                 return;
 937
 938         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 939                 if (connector->polled)
 940                         poll = true;
 941         }
 942
 943         if (poll)
 944                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
 945 }
 946 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
 947
 948 void drm_kms_helper_poll_init(struct drm_device *dev)
 949 {
 950         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
 951         dev->mode_config.poll_enabled = true;
 952
 953         drm_kms_helper_poll_enable(dev);
 954 }
 955 EXPORT_SYMBOL(drm_kms_helper_poll_init);
 956
 957 void drm_kms_helper_poll_fini(struct drm_device *dev)
 958 {
 959         drm_kms_helper_poll_disable(dev);
 960 }
 961 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
 962
 963 void drm_helper_hpd_irq_event(struct drm_device *dev)
 964 {
 965         if (!dev->mode_config.poll_enabled)
 966                 return;
 967
 968         /* kill timer and schedule immediate execution, this doesn't block */
 969         cancel_delayed_work(&dev->mode_config.output_poll_work);
 970         if (drm_kms_helper_poll)
 971                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
 972 }
 973 EXPORT_SYMBOL(drm_helper_hpd_irq_event);