sys/dev/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 #include <linux/moduleparam.h>
  34
  35 #include <drm/drmP.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_crtc_helper.h>
  38 #include <drm/drm_fb_helper.h>
  39 #include <drm/drm_edid.h>
  40
  41 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  42 MODULE_DESCRIPTION("DRM KMS helper");
  43
  44 /**
  45  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  46  *                                              connector list
  47  * @dev: drm device to operate on
  48  *
  49  * Some userspace presumes that the first connected connector is the main
  50  * display, where it's supposed to display e.g. the login screen. For
  51  * laptops, this should be the main panel. Use this function to sort all
  52  * (eDP/LVDS) panels to the front of the connector list, instead of
  53  * painstakingly trying to initialize them in the right order.
  54  */
  55 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  56 {
  57         struct drm_connector *connector, *tmp;
  58         struct list_head panel_list;
  59
  60         INIT_LIST_HEAD(&panel_list);
  61
  62         list_for_each_entry_safe(connector, tmp,
  63                                  &dev->mode_config.connector_list, head) {
  64                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  65                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  66                         list_move_tail(&connector->head, &panel_list);
  67         }
  68
  69         list_splice(&panel_list, &dev->mode_config.connector_list);
  70 }
  71 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  72
  73 /**
  74  * drm_helper_encoder_in_use - check if a given encoder is in use
  75  * @encoder: encoder to check
  76  *
  77  * Checks whether @encoder is with the current mode setting output configuration
  78  * in use by any connector. This doesn't mean that it is actually enabled since
  79  * the DPMS state is tracked separately.
  80  *
  81  * Returns:
  82  * True if @encoder is used, false otherwise.
  83  */
  84 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
  85 {
  86         struct drm_connector *connector;
  87         struct drm_device *dev = encoder->dev;
  88
  89         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
  90         WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
  91         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  92                 if (connector->encoder == encoder)
  93                         return true;
  94         return false;
  95 }
  96 EXPORT_SYMBOL(drm_helper_encoder_in_use);
  97
  98 /**
  99  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 100  * @crtc: CRTC to check
 101  *
 102  * Checks whether @crtc is with the current mode setting output configuration
 103  * in use by any connector. This doesn't mean that it is actually enabled since
 104  * the DPMS state is tracked separately.
 105  *
 106  * Returns:
 107  * True if @crtc is used, false otherwise.
 108  */
 109 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 110 {
 111         struct drm_encoder *encoder;
 112         struct drm_device *dev = crtc->dev;
 113
 114         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 115         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 116                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 117                         return true;
 118         return false;
 119 }
 120 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 121
 122 static void
 123 drm_encoder_disable(struct drm_encoder *encoder)
 124 {
 125         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 126
 127         if (encoder->bridge)
 128                 encoder->bridge->funcs->disable(encoder->bridge);
 129
 130         if (encoder_funcs->disable)
 131                 (*encoder_funcs->disable)(encoder);
 132         else
 133                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 134
 135         if (encoder->bridge)
 136                 encoder->bridge->funcs->post_disable(encoder->bridge);
 137 }
 138
 139 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
 140 {
 141         struct drm_encoder *encoder;
 142         struct drm_crtc *crtc;
 143
 144         drm_warn_on_modeset_not_all_locked(dev);
 145
 146         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 147                 if (!drm_helper_encoder_in_use(encoder)) {
 148                         drm_encoder_disable(encoder);
 149                         /* disconnect encoder from any connector */
 150                         encoder->crtc = NULL;
 151                 }
 152         }
 153
 154         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 155                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 156                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 157                 if (!crtc->enabled) {
 158                         if (crtc_funcs->disable)
 159                                 (*crtc_funcs->disable)(crtc);
 160                         else
 161                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 162                         crtc->primary->fb = NULL;
 163                 }
 164         }
 165 }
 166
 167 /**
 168  * drm_helper_disable_unused_functions - disable unused objects
 169  * @dev: DRM device
 170  *
 171  * This function walks through the entire mode setting configuration of @dev. It
 172  * will remove any crtc links of unused encoders and encoder links of
 173  * disconnected connectors. Then it will disable all unused encoders and crtcs
 174  * either by calling their disable callback if available or by calling their
 175  * dpms callback with DRM_MODE_DPMS_OFF.
 176  */
 177 void drm_helper_disable_unused_functions(struct drm_device *dev)
 178 {
 179         drm_modeset_lock_all(dev);
 180         __drm_helper_disable_unused_functions(dev);
 181         drm_modeset_unlock_all(dev);
 182 }
 183 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 184
 185 /*
 186  * Check the CRTC we're going to map each output to vs. its current
 187  * CRTC.  If they don't match, we have to disable the output and the CRTC
 188  * since the driver will have to re-route things.
 189  */
 190 static void
 191 drm_crtc_prepare_encoders(struct drm_device *dev)
 192 {
 193         struct drm_encoder_helper_funcs *encoder_funcs;
 194         struct drm_encoder *encoder;
 195
 196         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 197                 encoder_funcs = encoder->helper_private;
 198                 /* Disable unused encoders */
 199                 if (encoder->crtc == NULL)
 200                         drm_encoder_disable(encoder);
 201                 /* Disable encoders whose CRTC is about to change */
 202                 if (encoder_funcs->get_crtc &&
 203                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 204                         drm_encoder_disable(encoder);
 205         }
 206 }
 207
 208 /**
 209  * drm_crtc_helper_set_mode - internal helper to set a mode
 210  * @crtc: CRTC to program
 211  * @mode: mode to use
 212  * @x: horizontal offset into the surface
 213  * @y: vertical offset into the surface
 214  * @old_fb: old framebuffer, for cleanup
 215  *
 216  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 217  * to fixup or reject the mode prior to trying to set it. This is an internal
 218  * helper that drivers could e.g. use to update properties that require the
 219  * entire output pipe to be disabled and re-enabled in a new configuration. For
 220  * example for changing whether audio is enabled on a hdmi link or for changing
 221  * panel fitter or dither attributes. It is also called by the
 222  * drm_crtc_helper_set_config() helper function to drive the mode setting
 223  * sequence.
 224  *
 225  * Returns:
 226  * True if the mode was set successfully, false otherwise.
 227  */
 228 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 229                               struct drm_display_mode *mode,
 230                               int x, int y,
 231                               struct drm_framebuffer *old_fb)
 232 {
 233         struct drm_device *dev = crtc->dev;
 234         struct drm_display_mode *adjusted_mode, saved_mode;
 235         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 236         struct drm_encoder_helper_funcs *encoder_funcs;
 237         int saved_x, saved_y;
 238         bool saved_enabled;
 239         struct drm_encoder *encoder;
 240         bool ret = true;
 241
 242         drm_warn_on_modeset_not_all_locked(dev);
 243
 244         saved_enabled = crtc->enabled;
 245         crtc->enabled = drm_helper_crtc_in_use(crtc);
 246         if (!crtc->enabled)
 247                 return true;
 248
 249         adjusted_mode = drm_mode_duplicate(dev, mode);
 250         if (!adjusted_mode) {
 251                 crtc->enabled = saved_enabled;
 252                 return false;
 253         }
 254
 255         saved_mode = crtc->mode;
 256         saved_x = crtc->x;
 257         saved_y = crtc->y;
 258
 259         /* Update crtc values up front so the driver can rely on them for mode
 260          * setting.
 261          */
 262         crtc->mode = *mode;
 263         crtc->x = x;
 264         crtc->y = y;
 265
 266         /* Pass our mode to the connectors and the CRTC to give them a chance to
 267          * adjust it according to limitations or connector properties, and also
 268          * a chance to reject the mode entirely.
 269          */
 270         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 271
 272                 if (encoder->crtc != crtc)
 273                         continue;
 274
 275                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 276                         ret = encoder->bridge->funcs->mode_fixup(
 277                                         encoder->bridge, mode, adjusted_mode);
 278                         if (!ret) {
 279                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 280                                 goto done;
 281                         }
 282                 }
 283
 284                 encoder_funcs = encoder->helper_private;
 285                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 286                                                       adjusted_mode))) {
 287                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 288                         goto done;
 289                 }
 290         }
 291
 292         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 293                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 294                 goto done;
 295         }
 296         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 297
 298         /* Prepare the encoders and CRTCs before setting the mode. */
 299         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 300
 301                 if (encoder->crtc != crtc)
 302                         continue;
 303
 304                 if (encoder->bridge)
 305                         encoder->bridge->funcs->disable(encoder->bridge);
 306
 307                 encoder_funcs = encoder->helper_private;
 308                 /* Disable the encoders as the first thing we do. */
 309                 encoder_funcs->prepare(encoder);
 310
 311                 if (encoder->bridge)
 312                         encoder->bridge->funcs->post_disable(encoder->bridge);
 313         }
 314
 315         drm_crtc_prepare_encoders(dev);
 316
 317         crtc_funcs->prepare(crtc);
 318
 319         /* Set up the DPLL and any encoders state that needs to adjust or depend
 320          * on the DPLL.
 321          */
 322         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 323         if (!ret)
 324             goto done;
 325
 326         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 327
 328                 if (encoder->crtc != crtc)
 329                         continue;
 330
 331                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 332                         encoder->base.id, encoder->name,
 333                         mode->base.id, mode->name);
 334                 encoder_funcs = encoder->helper_private;
 335                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 336
 337                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 338                         encoder->bridge->funcs->mode_set(encoder->bridge, mode,
 339                                         adjusted_mode);
 340         }
 341
 342         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 343         crtc_funcs->commit(crtc);
 344
 345         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 346
 347                 if (encoder->crtc != crtc)
 348                         continue;
 349
 350                 if (encoder->bridge)
 351                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 352
 353                 encoder_funcs = encoder->helper_private;
 354                 encoder_funcs->commit(encoder);
 355
 356                 if (encoder->bridge)
 357                         encoder->bridge->funcs->enable(encoder->bridge);
 358         }
 359
 360         /* Store real post-adjustment hardware mode. */
 361         crtc->hwmode = *adjusted_mode;
 362
 363         /* Calculate and store various constants which
 364          * are later needed by vblank and swap-completion
 365          * timestamping. They are derived from true hwmode.
 366          */
 367         drm_calc_timestamping_constants(crtc, &crtc->hwmode);
 368
 369         /* FIXME: add subpixel order */
 370 done:
 371         drm_mode_destroy(dev, adjusted_mode);
 372         if (!ret) {
 373                 crtc->enabled = saved_enabled;
 374                 crtc->mode = saved_mode;
 375                 crtc->x = saved_x;
 376                 crtc->y = saved_y;
 377         }
 378
 379         return ret;
 380 }
 381 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 382
 383 static void
 384 drm_crtc_helper_disable(struct drm_crtc *crtc)
 385 {
 386         struct drm_device *dev = crtc->dev;
 387         struct drm_connector *connector;
 388         struct drm_encoder *encoder;
 389
 390         /* Decouple all encoders and their attached connectors from this crtc */
 391         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 392                 if (encoder->crtc != crtc)
 393                         continue;
 394
 395                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 396                         if (connector->encoder != encoder)
 397                                 continue;
 398
 399                         connector->encoder = NULL;
 400
 401                         /*
 402                          * drm_helper_disable_unused_functions() ought to be
 403                          * doing this, but since we've decoupled the encoder
 404                          * from the connector above, the required connection
 405                          * between them is henceforth no longer available.
 406                          */
 407                         connector->dpms = DRM_MODE_DPMS_OFF;
 408                 }
 409         }
 410
 411         __drm_helper_disable_unused_functions(dev);
 412 }
 413
 414 /**
 415  * drm_crtc_helper_set_config - set a new config from userspace
 416  * @set: mode set configuration
 417  *
 418  * Setup a new configuration, provided by the upper layers (either an ioctl call
 419  * from userspace or internally e.g. from the fbdev support code) in @set, and
 420  * enable it. This is the main helper functions for drivers that implement
 421  * kernel mode setting with the crtc helper functions and the assorted
 422  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 423  *
 424  * Returns:
 425  * Returns 0 on success, negative errno numbers on failure.
 426  */
 427 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 428 {
 429         struct drm_device *dev;
 430         struct drm_crtc *new_crtc;
 431         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 432         bool mode_changed = false; /* if true do a full mode set */
 433         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 434         struct drm_connector *save_connectors, *connector;
 435         int count = 0, ro, fail = 0;
 436         struct drm_crtc_helper_funcs *crtc_funcs;
 437         struct drm_mode_set save_set;
 438         int ret;
 439         int i;
 440
 441         DRM_DEBUG_KMS("\n");
 442
 443         BUG_ON(!set);
 444         BUG_ON(!set->crtc);
 445         BUG_ON(!set->crtc->helper_private);
 446
 447         /* Enforce sane interface api - has been abused by the fb helper. */
 448         BUG_ON(!set->mode && set->fb);
 449         BUG_ON(set->fb && set->num_connectors == 0);
 450
 451         crtc_funcs = set->crtc->helper_private;
 452
 453         if (!set->mode)
 454                 set->fb = NULL;
 455
 456         if (set->fb) {
 457                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 458                                 set->crtc->base.id, set->fb->base.id,
 459                                 (int)set->num_connectors, set->x, set->y);
 460         } else {
 461                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 462                 drm_crtc_helper_disable(set->crtc);
 463                 return 0;
 464         }
 465
 466         dev = set->crtc->dev;
 467
 468         drm_warn_on_modeset_not_all_locked(dev);
 469
 470         /*
 471          * Allocate space for the backup of all (non-pointer) encoder and
 472          * connector data.
 473          */
 474         save_encoders = kzalloc(dev->mode_config.num_encoder *
 475                                 sizeof(struct drm_encoder), GFP_KERNEL);
 476         if (!save_encoders)
 477                 return -ENOMEM;
 478
 479         save_connectors = kzalloc(dev->mode_config.num_connector *
 480                                 sizeof(struct drm_connector), GFP_KERNEL);
 481         if (!save_connectors) {
 482                 kfree(save_encoders);
 483                 return -ENOMEM;
 484         }
 485
 486         /*
 487          * Copy data. Note that driver private data is not affected.
 488          * Should anything bad happen only the expected state is
 489          * restored, not the drivers personal bookkeeping.
 490          */
 491         count = 0;
 492         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 493                 save_encoders[count++] = *encoder;
 494         }
 495
 496         count = 0;
 497         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 498                 save_connectors[count++] = *connector;
 499         }
 500
 501         save_set.crtc = set->crtc;
 502         save_set.mode = &set->crtc->mode;
 503         save_set.x = set->crtc->x;
 504         save_set.y = set->crtc->y;
 505         save_set.fb = set->crtc->primary->fb;
 506
 507         /* We should be able to check here if the fb has the same properties
 508          * and then just flip_or_move it */
 509         if (set->crtc->primary->fb != set->fb) {
 510                 /* If we have no fb then treat it as a full mode set */
 511                 if (set->crtc->primary->fb == NULL) {
 512                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 513                         mode_changed = true;
 514                 } else if (set->fb == NULL) {
 515                         mode_changed = true;
 516                 } else if (set->fb->pixel_format !=
 517                            set->crtc->primary->fb->pixel_format) {
 518                         mode_changed = true;
 519                 } else
 520                         fb_changed = true;
 521         }
 522
 523         if (set->x != set->crtc->x || set->y != set->crtc->y)
 524                 fb_changed = true;
 525
 526         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 527                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 528                 drm_mode_debug_printmodeline(&set->crtc->mode);
 529                 drm_mode_debug_printmodeline(set->mode);
 530                 mode_changed = true;
 531         }
 532
 533         /* a) traverse passed in connector list and get encoders for them */
 534         count = 0;
 535         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 536                 struct drm_connector_helper_funcs *connector_funcs =
 537                         connector->helper_private;
 538                 new_encoder = connector->encoder;
 539                 for (ro = 0; ro < set->num_connectors; ro++) {
 540                         if (set->connectors[ro] == connector) {
 541                                 new_encoder = connector_funcs->best_encoder(connector);
 542                                 /* if we can't get an encoder for a connector
 543                                    we are setting now - then fail */
 544                                 if (new_encoder == NULL)
 545                                         /* don't break so fail path works correct */
 546                                         fail = 1;
 547
 548                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 549                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 550                                         mode_changed = true;
 551                                 }
 552
 553                                 break;
 554                         }
 555                 }
 556
 557                 if (new_encoder != connector->encoder) {
 558                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 559                         mode_changed = true;
 560                         /* If the encoder is reused for another connector, then
 561                          * the appropriate crtc will be set later.
 562                          */
 563                         if (connector->encoder)
 564                                 connector->encoder->crtc = NULL;
 565                         connector->encoder = new_encoder;
 566                 }
 567         }
 568
 569         if (fail) {
 570                 ret = -EINVAL;
 571                 goto fail;
 572         }
 573
 574         count = 0;
 575         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 576                 if (!connector->encoder)
 577                         continue;
 578
 579                 if (connector->encoder->crtc == set->crtc)
 580                         new_crtc = NULL;
 581                 else
 582                         new_crtc = connector->encoder->crtc;
 583
 584                 for (ro = 0; ro < set->num_connectors; ro++) {
 585                         if (set->connectors[ro] == connector)
 586                                 new_crtc = set->crtc;
 587                 }
 588
 589                 /* Make sure the new CRTC will work with the encoder */
 590                 if (new_crtc &&
 591                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 592                         ret = -EINVAL;
 593                         goto fail;
 594                 }
 595                 if (new_crtc != connector->encoder->crtc) {
 596                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 597                         mode_changed = true;
 598                         connector->encoder->crtc = new_crtc;
 599                 }
 600                 if (new_crtc) {
 601                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 602                                 connector->base.id, connector->name,
 603                                 new_crtc->base.id);
 604                 } else {
 605                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 606                                 connector->base.id, connector->name);
 607                 }
 608         }
 609
 610         /* mode_set_base is not a required function */
 611         if (fb_changed && !crtc_funcs->mode_set_base)
 612                 mode_changed = true;
 613
 614         if (mode_changed) {
 615                 if (drm_helper_crtc_in_use(set->crtc)) {
 616                         DRM_DEBUG_KMS("attempting to set mode from"
 617                                         " userspace\n");
 618                         drm_mode_debug_printmodeline(set->mode);
 619                         set->crtc->primary->fb = set->fb;
 620                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 621                                                       set->x, set->y,
 622                                                       save_set.fb)) {
 623                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 624                                           set->crtc->base.id);
 625                                 set->crtc->primary->fb = save_set.fb;
 626                                 ret = -EINVAL;
 627                                 goto fail;
 628                         }
 629                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 630                         for (i = 0; i < set->num_connectors; i++) {
 631                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 632                                               set->connectors[i]->name);
 633                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 634                         }
 635                 }
 636                 __drm_helper_disable_unused_functions(dev);
 637         } else if (fb_changed) {
 638                 set->crtc->x = set->x;
 639                 set->crtc->y = set->y;
 640                 set->crtc->primary->fb = set->fb;
 641                 ret = crtc_funcs->mode_set_base(set->crtc,
 642                                                 set->x, set->y, save_set.fb);
 643                 if (ret != 0) {
 644                         set->crtc->x = save_set.x;
 645                         set->crtc->y = save_set.y;
 646                         set->crtc->primary->fb = save_set.fb;
 647                         goto fail;
 648                 }
 649         }
 650
 651         kfree(save_connectors);
 652         kfree(save_encoders);
 653         return 0;
 654
 655 fail:
 656         /* Restore all previous data. */
 657         count = 0;
 658         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 659                 *encoder = save_encoders[count++];
 660         }
 661
 662         count = 0;
 663         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 664                 *connector = save_connectors[count++];
 665         }
 666
 667         /* Try to restore the config */
 668         if (mode_changed &&
 669             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 670                                       save_set.y, save_set.fb))
 671                 DRM_ERROR("failed to restore config after modeset failure\n");
 672
 673         kfree(save_connectors);
 674         kfree(save_encoders);
 675         return ret;
 676 }
 677 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 678
 679 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 680 {
 681         int dpms = DRM_MODE_DPMS_OFF;
 682         struct drm_connector *connector;
 683         struct drm_device *dev = encoder->dev;
 684
 685         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 686                 if (connector->encoder == encoder)
 687                         if (connector->dpms < dpms)
 688                                 dpms = connector->dpms;
 689         return dpms;
 690 }
 691
 692 /* Helper which handles bridge ordering around encoder dpms */
 693 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 694 {
 695         struct drm_bridge *bridge = encoder->bridge;
 696         struct drm_encoder_helper_funcs *encoder_funcs;
 697
 698         if (bridge) {
 699                 if (mode == DRM_MODE_DPMS_ON)
 700                         bridge->funcs->pre_enable(bridge);
 701                 else
 702                         bridge->funcs->disable(bridge);
 703         }
 704
 705         encoder_funcs = encoder->helper_private;
 706         if (encoder_funcs->dpms)
 707                 encoder_funcs->dpms(encoder, mode);
 708
 709         if (bridge) {
 710                 if (mode == DRM_MODE_DPMS_ON)
 711                         bridge->funcs->enable(bridge);
 712                 else
 713                         bridge->funcs->post_disable(bridge);
 714         }
 715 }
 716
 717 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 718 {
 719         int dpms = DRM_MODE_DPMS_OFF;
 720         struct drm_connector *connector;
 721         struct drm_device *dev = crtc->dev;
 722
 723         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 724                 if (connector->encoder && connector->encoder->crtc == crtc)
 725                         if (connector->dpms < dpms)
 726                                 dpms = connector->dpms;
 727         return dpms;
 728 }
 729
 730 /**
 731  * drm_helper_connector_dpms() - connector dpms helper implementation
 732  * @connector: affected connector
 733  * @mode: DPMS mode
 734  *
 735  * This is the main helper function provided by the crtc helper framework for
 736  * implementing the DPMS connector attribute. It computes the new desired DPMS
 737  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 738  * callback provided by the driver appropriately.
 739  */
 740 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 741 {
 742         struct drm_encoder *encoder = connector->encoder;
 743         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 744         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 745
 746         if (mode == connector->dpms)
 747                 return;
 748
 749         old_dpms = connector->dpms;
 750         connector->dpms = mode;
 751
 752         if (encoder)
 753                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 754
 755         /* from off to on, do crtc then encoder */
 756         if (mode < old_dpms) {
 757                 if (crtc) {
 758                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 759                         if (crtc_funcs->dpms)
 760                                 (*crtc_funcs->dpms) (crtc,
 761                                                      drm_helper_choose_crtc_dpms(crtc));
 762                 }
 763                 if (encoder)
 764                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 765         }
 766
 767         /* from on to off, do encoder then crtc */
 768         if (mode > old_dpms) {
 769                 if (encoder)
 770                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 771                 if (crtc) {
 772                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 773                         if (crtc_funcs->dpms)
 774                                 (*crtc_funcs->dpms) (crtc,
 775                                                      drm_helper_choose_crtc_dpms(crtc));
 776                 }
 777         }
 778
 779         return;
 780 }
 781 EXPORT_SYMBOL(drm_helper_connector_dpms);
 782
 783 /**
 784  * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
 785  * @fb: drm_framebuffer object to fill out
 786  * @mode_cmd: metadata from the userspace fb creation request
 787  *
 788  * This helper can be used in a drivers fb_create callback to pre-fill the fb's
 789  * metadata fields.
 790  */
 791 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 792                                     struct drm_mode_fb_cmd2 *mode_cmd)
 793 {
 794         int i;
 795
 796         fb->width = mode_cmd->width;
 797         fb->height = mode_cmd->height;
 798         for (i = 0; i < 4; i++) {
 799                 fb->pitches[i] = mode_cmd->pitches[i];
 800                 fb->offsets[i] = mode_cmd->offsets[i];
 801         }
 802         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 803                                     &fb->bits_per_pixel);
 804         fb->pixel_format = mode_cmd->pixel_format;
 805         fb->flags = mode_cmd->flags;
 806 }
 807 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 808
 809 /**
 810  * drm_helper_resume_force_mode - force-restore mode setting configuration
 811  * @dev: drm_device which should be restored
 812  *
 813  * Drivers which use the mode setting helpers can use this function to
 814  * force-restore the mode setting configuration e.g. on resume or when something
 815  * else might have trampled over the hw state (like some overzealous old BIOSen
 816  * tended to do).
 817  *
 818  * This helper doesn't provide a error return value since restoring the old
 819  * config should never fail due to resource allocation issues since the driver
 820  * has successfully set the restored configuration already. Hence this should
 821  * boil down to the equivalent of a few dpms on calls, which also don't provide
 822  * an error code.
 823  *
 824  * Drivers where simply restoring an old configuration again might fail (e.g.
 825  * due to slight differences in allocating shared resources when the
 826  * configuration is restored in a different order than when userspace set it up)
 827  * need to use their own restore logic.
 828  */
 829 void drm_helper_resume_force_mode(struct drm_device *dev)
 830 {
 831         struct drm_crtc *crtc;
 832         struct drm_encoder *encoder;
 833         struct drm_crtc_helper_funcs *crtc_funcs;
 834         int encoder_dpms;
 835         bool ret;
 836
 837         drm_modeset_lock_all(dev);
 838         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 839
 840                 if (!crtc->enabled)
 841                         continue;
 842
 843                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 844                                                crtc->x, crtc->y, crtc->primary->fb);
 845
 846                 /* Restoring the old config should never fail! */
 847                 if (ret == false)
 848                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 849
 850                 /* Turn off outputs that were already powered off */
 851                 if (drm_helper_choose_crtc_dpms(crtc)) {
 852                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 853
 854                                 if(encoder->crtc != crtc)
 855                                         continue;
 856
 857                                 encoder_dpms = drm_helper_choose_encoder_dpms(
 858                                                         encoder);
 859
 860                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
 861                         }
 862
 863                         crtc_funcs = crtc->helper_private;
 864                         if (crtc_funcs->dpms)
 865                                 (*crtc_funcs->dpms) (crtc,
 866                                                      drm_helper_choose_crtc_dpms(crtc));
 867                 }
 868         }
 869
 870         /* disable the unused connectors while restoring the modesetting */
 871         __drm_helper_disable_unused_functions(dev);
 872         drm_modeset_unlock_all(dev);
 873 }
 874 EXPORT_SYMBOL(drm_helper_resume_force_mode);