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 #include <linux/moduleparam.h>
  34
  35 #include <drm/drmP.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_fourcc.h>
  38 #include <drm/drm_crtc_helper.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_edid.h>
  41
  42 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  43 MODULE_DESCRIPTION("DRM KMS helper");
  44 MODULE_LICENSE("GPL and additional rights");
  45
  46 /**
  47  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  48  *                                              connector list
  49  * @dev: drm device to operate on
  50  *
  51  * Some userspace presumes that the first connected connector is the main
  52  * display, where it's supposed to display e.g. the login screen. For
  53  * laptops, this should be the main panel. Use this function to sort all
  54  * (eDP/LVDS) panels to the front of the connector list, instead of
  55  * painstakingly trying to initialize them in the right order.
  56  */
  57 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  58 {
  59         struct drm_connector *connector, *tmp;
  60         struct list_head panel_list;
  61
  62         INIT_LIST_HEAD(&panel_list);
  63
  64         list_for_each_entry_safe(connector, tmp,
  65                                  &dev->mode_config.connector_list, head) {
  66                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  67                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  68                         list_move_tail(&connector->head, &panel_list);
  69         }
  70
  71         list_splice(&panel_list, &dev->mode_config.connector_list);
  72 }
  73 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  74
  75 /**
  76  * drm_helper_encoder_in_use - check if a given encoder is in use
  77  * @encoder: encoder to check
  78  *
  79  * Checks whether @encoder is with the current mode setting output configuration
  80  * in use by any connector. This doesn't mean that it is actually enabled since
  81  * the DPMS state is tracked separately.
  82  *
  83  * Returns:
  84  * True if @encoder is used, false otherwise.
  85  */
  86 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
  87 {
  88         struct drm_connector *connector;
  89         struct drm_device *dev = encoder->dev;
  90
  91         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
  92         WARN_ON(!mutex_is_locked(&dev->mode_config.connection_mutex));
  93
  94         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  95                 if (connector->encoder == encoder)
  96                         return true;
  97         return false;
  98 }
  99 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 100
 101 /**
 102  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 103  * @crtc: CRTC to check
 104  *
 105  * Checks whether @crtc is with the current mode setting output configuration
 106  * in use by any connector. This doesn't mean that it is actually enabled since
 107  * the DPMS state is tracked separately.
 108  *
 109  * Returns:
 110  * True if @crtc is used, false otherwise.
 111  */
 112 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 113 {
 114         struct drm_encoder *encoder;
 115         struct drm_device *dev = crtc->dev;
 116
 117         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 118         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 119                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 120                         return true;
 121         return false;
 122 }
 123 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 124
 125 static void
 126 drm_encoder_disable(struct drm_encoder *encoder)
 127 {
 128         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 129
 130         if (encoder->bridge)
 131                 encoder->bridge->funcs->disable(encoder->bridge);
 132
 133         if (encoder_funcs->disable)
 134                 (*encoder_funcs->disable)(encoder);
 135         else
 136                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 137
 138         if (encoder->bridge)
 139                 encoder->bridge->funcs->post_disable(encoder->bridge);
 140 }
 141
 142 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
 143 {
 144         struct drm_encoder *encoder;
 145         struct drm_crtc *crtc;
 146
 147         drm_warn_on_modeset_not_all_locked(dev);
 148
 149         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 150                 if (!drm_helper_encoder_in_use(encoder)) {
 151                         drm_encoder_disable(encoder);
 152                         /* disconnect encoder from any connector */
 153                         encoder->crtc = NULL;
 154                 }
 155         }
 156
 157         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 158                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 159                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 160                 if (!crtc->enabled) {
 161                         if (crtc_funcs->disable)
 162                                 (*crtc_funcs->disable)(crtc);
 163                         else
 164                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 165                         crtc->primary->fb = NULL;
 166                 }
 167         }
 168 }
 169
 170 /**
 171  * drm_helper_disable_unused_functions - disable unused objects
 172  * @dev: DRM device
 173  *
 174  * This function walks through the entire mode setting configuration of @dev. It
 175  * will remove any crtc links of unused encoders and encoder links of
 176  * disconnected connectors. Then it will disable all unused encoders and crtcs
 177  * either by calling their disable callback if available or by calling their
 178  * dpms callback with DRM_MODE_DPMS_OFF.
 179  */
 180 void drm_helper_disable_unused_functions(struct drm_device *dev)
 181 {
 182         drm_modeset_lock_all(dev);
 183         __drm_helper_disable_unused_functions(dev);
 184         drm_modeset_unlock_all(dev);
 185 }
 186 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 187
 188 /*
 189  * Check the CRTC we're going to map each output to vs. its current
 190  * CRTC.  If they don't match, we have to disable the output and the CRTC
 191  * since the driver will have to re-route things.
 192  */
 193 static void
 194 drm_crtc_prepare_encoders(struct drm_device *dev)
 195 {
 196         struct drm_encoder_helper_funcs *encoder_funcs;
 197         struct drm_encoder *encoder;
 198
 199         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 200                 encoder_funcs = encoder->helper_private;
 201                 /* Disable unused encoders */
 202                 if (encoder->crtc == NULL)
 203                         drm_encoder_disable(encoder);
 204                 /* Disable encoders whose CRTC is about to change */
 205                 if (encoder_funcs->get_crtc &&
 206                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 207                         drm_encoder_disable(encoder);
 208         }
 209 }
 210
 211 /**
 212  * drm_crtc_helper_set_mode - internal helper to set a mode
 213  * @crtc: CRTC to program
 214  * @mode: mode to use
 215  * @x: horizontal offset into the surface
 216  * @y: vertical offset into the surface
 217  * @old_fb: old framebuffer, for cleanup
 218  *
 219  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 220  * to fixup or reject the mode prior to trying to set it. This is an internal
 221  * helper that drivers could e.g. use to update properties that require the
 222  * entire output pipe to be disabled and re-enabled in a new configuration. For
 223  * example for changing whether audio is enabled on a hdmi link or for changing
 224  * panel fitter or dither attributes. It is also called by the
 225  * drm_crtc_helper_set_config() helper function to drive the mode setting
 226  * sequence.
 227  *
 228  * Returns:
 229  * True if the mode was set successfully, false otherwise.
 230  */
 231 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 232                               struct drm_display_mode *mode,
 233                               int x, int y,
 234                               struct drm_framebuffer *old_fb)
 235 {
 236         struct drm_device *dev = crtc->dev;
 237         struct drm_display_mode *adjusted_mode, saved_mode;
 238         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 239         struct drm_encoder_helper_funcs *encoder_funcs;
 240         int saved_x, saved_y;
 241         bool saved_enabled;
 242         struct drm_encoder *encoder;
 243         bool ret = true;
 244
 245         drm_warn_on_modeset_not_all_locked(dev);
 246
 247         saved_enabled = crtc->enabled;
 248         crtc->enabled = drm_helper_crtc_in_use(crtc);
 249         if (!crtc->enabled)
 250                 return true;
 251
 252         adjusted_mode = drm_mode_duplicate(dev, mode);
 253         if (!adjusted_mode) {
 254                 crtc->enabled = saved_enabled;
 255                 return false;
 256         }
 257
 258         saved_mode = crtc->mode;
 259         saved_x = crtc->x;
 260         saved_y = crtc->y;
 261
 262         /* Update crtc values up front so the driver can rely on them for mode
 263          * setting.
 264          */
 265         crtc->mode = *mode;
 266         crtc->x = x;
 267         crtc->y = y;
 268
 269         /* Pass our mode to the connectors and the CRTC to give them a chance to
 270          * adjust it according to limitations or connector properties, and also
 271          * a chance to reject the mode entirely.
 272          */
 273         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 274
 275                 if (encoder->crtc != crtc)
 276                         continue;
 277
 278                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 279                         ret = encoder->bridge->funcs->mode_fixup(
 280                                         encoder->bridge, mode, adjusted_mode);
 281                         if (!ret) {
 282                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 283                                 goto done;
 284                         }
 285                 }
 286
 287                 encoder_funcs = encoder->helper_private;
 288                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 289                                                       adjusted_mode))) {
 290                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 291                         goto done;
 292                 }
 293         }
 294
 295         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 296                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 297                 goto done;
 298         }
 299         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 300
 301         /* Prepare the encoders and CRTCs before setting the mode. */
 302         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 303
 304                 if (encoder->crtc != crtc)
 305                         continue;
 306
 307                 if (encoder->bridge)
 308                         encoder->bridge->funcs->disable(encoder->bridge);
 309
 310                 encoder_funcs = encoder->helper_private;
 311                 /* Disable the encoders as the first thing we do. */
 312                 encoder_funcs->prepare(encoder);
 313
 314                 if (encoder->bridge)
 315                         encoder->bridge->funcs->post_disable(encoder->bridge);
 316         }
 317
 318         drm_crtc_prepare_encoders(dev);
 319
 320         crtc_funcs->prepare(crtc);
 321
 322         /* Set up the DPLL and any encoders state that needs to adjust or depend
 323          * on the DPLL.
 324          */
 325         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 326         if (!ret)
 327             goto done;
 328
 329         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 330
 331                 if (encoder->crtc != crtc)
 332                         continue;
 333
 334                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 335                         encoder->base.id, encoder->name,
 336                         mode->base.id, mode->name);
 337                 encoder_funcs = encoder->helper_private;
 338                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 339
 340                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 341                         encoder->bridge->funcs->mode_set(encoder->bridge, mode,
 342                                         adjusted_mode);
 343         }
 344
 345         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 346         crtc_funcs->commit(crtc);
 347
 348         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 349
 350                 if (encoder->crtc != crtc)
 351                         continue;
 352
 353                 if (encoder->bridge)
 354                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 355
 356                 encoder_funcs = encoder->helper_private;
 357                 encoder_funcs->commit(encoder);
 358
 359                 if (encoder->bridge)
 360                         encoder->bridge->funcs->enable(encoder->bridge);
 361         }
 362
 363         /* Store real post-adjustment hardware mode. */
 364         crtc->hwmode = *adjusted_mode;
 365
 366         /* Calculate and store various constants which
 367          * are later needed by vblank and swap-completion
 368          * timestamping. They are derived from true hwmode.
 369          */
 370         drm_calc_timestamping_constants(crtc, &crtc->hwmode);
 371
 372         /* FIXME: add subpixel order */
 373 done:
 374         drm_mode_destroy(dev, adjusted_mode);
 375         if (!ret) {
 376                 crtc->enabled = saved_enabled;
 377                 crtc->mode = saved_mode;
 378                 crtc->x = saved_x;
 379                 crtc->y = saved_y;
 380         }
 381
 382         return ret;
 383 }
 384 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 385
 386 static void
 387 drm_crtc_helper_disable(struct drm_crtc *crtc)
 388 {
 389         struct drm_device *dev = crtc->dev;
 390         struct drm_connector *connector;
 391         struct drm_encoder *encoder;
 392
 393         /* Decouple all encoders and their attached connectors from this crtc */
 394         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 395                 if (encoder->crtc != crtc)
 396                         continue;
 397
 398                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 399                         if (connector->encoder != encoder)
 400                                 continue;
 401
 402                         connector->encoder = NULL;
 403
 404                         /*
 405                          * drm_helper_disable_unused_functions() ought to be
 406                          * doing this, but since we've decoupled the encoder
 407                          * from the connector above, the required connection
 408                          * between them is henceforth no longer available.
 409                          */
 410                         connector->dpms = DRM_MODE_DPMS_OFF;
 411                 }
 412         }
 413
 414         __drm_helper_disable_unused_functions(dev);
 415 }
 416
 417 /**
 418  * drm_crtc_helper_set_config - set a new config from userspace
 419  * @set: mode set configuration
 420  *
 421  * Setup a new configuration, provided by the upper layers (either an ioctl call
 422  * from userspace or internally e.g. from the fbdev support code) in @set, and
 423  * enable it. This is the main helper functions for drivers that implement
 424  * kernel mode setting with the crtc helper functions and the assorted
 425  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 426  *
 427  * Returns:
 428  * Returns 0 on success, negative errno numbers on failure.
 429  */
 430 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 431 {
 432         struct drm_device *dev;
 433         struct drm_crtc *new_crtc;
 434         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 435         bool mode_changed = false; /* if true do a full mode set */
 436         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 437         struct drm_connector *save_connectors, *connector;
 438         int count = 0, ro, fail = 0;
 439         struct drm_crtc_helper_funcs *crtc_funcs;
 440         struct drm_mode_set save_set;
 441         int ret;
 442         int i;
 443
 444         DRM_DEBUG_KMS("\n");
 445
 446         BUG_ON(!set);
 447         BUG_ON(!set->crtc);
 448         BUG_ON(!set->crtc->helper_private);
 449
 450         /* Enforce sane interface api - has been abused by the fb helper. */
 451         BUG_ON(!set->mode && set->fb);
 452         BUG_ON(set->fb && set->num_connectors == 0);
 453
 454         crtc_funcs = set->crtc->helper_private;
 455
 456         if (!set->mode)
 457                 set->fb = NULL;
 458
 459         if (set->fb) {
 460                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 461                                 set->crtc->base.id, set->fb->base.id,
 462                                 (int)set->num_connectors, set->x, set->y);
 463         } else {
 464                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 465                 drm_crtc_helper_disable(set->crtc);
 466                 return 0;
 467         }
 468
 469         dev = set->crtc->dev;
 470
 471         drm_warn_on_modeset_not_all_locked(dev);
 472
 473         /*
 474          * Allocate space for the backup of all (non-pointer) encoder and
 475          * connector data.
 476          */
 477         save_encoders = kzalloc(dev->mode_config.num_encoder *
 478                                 sizeof(struct drm_encoder), GFP_KERNEL);
 479         if (!save_encoders)
 480                 return -ENOMEM;
 481
 482         save_connectors = kzalloc(dev->mode_config.num_connector *
 483                                 sizeof(struct drm_connector), GFP_KERNEL);
 484         if (!save_connectors) {
 485                 kfree(save_encoders);
 486                 return -ENOMEM;
 487         }
 488
 489         /*
 490          * Copy data. Note that driver private data is not affected.
 491          * Should anything bad happen only the expected state is
 492          * restored, not the drivers personal bookkeeping.
 493          */
 494         count = 0;
 495         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 496                 save_encoders[count++] = *encoder;
 497         }
 498
 499         count = 0;
 500         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 501                 save_connectors[count++] = *connector;
 502         }
 503
 504         save_set.crtc = set->crtc;
 505         save_set.mode = &set->crtc->mode;
 506         save_set.x = set->crtc->x;
 507         save_set.y = set->crtc->y;
 508         save_set.fb = set->crtc->primary->fb;
 509
 510         /* We should be able to check here if the fb has the same properties
 511          * and then just flip_or_move it */
 512         if (set->crtc->primary->fb != set->fb) {
 513                 /* If we have no fb then treat it as a full mode set */
 514                 if (set->crtc->primary->fb == NULL) {
 515                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 516                         mode_changed = true;
 517                 } else if (set->fb == NULL) {
 518                         mode_changed = true;
 519                 } else if (set->fb->pixel_format !=
 520                            set->crtc->primary->fb->pixel_format) {
 521                         mode_changed = true;
 522                 } else
 523                         fb_changed = true;
 524         }
 525
 526         if (set->x != set->crtc->x || set->y != set->crtc->y)
 527                 fb_changed = true;
 528
 529         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 530                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 531                 drm_mode_debug_printmodeline(&set->crtc->mode);
 532                 drm_mode_debug_printmodeline(set->mode);
 533                 mode_changed = true;
 534         }
 535
 536         /* a) traverse passed in connector list and get encoders for them */
 537         count = 0;
 538         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 539                 struct drm_connector_helper_funcs *connector_funcs =
 540                         connector->helper_private;
 541                 new_encoder = connector->encoder;
 542                 for (ro = 0; ro < set->num_connectors; ro++) {
 543                         if (set->connectors[ro] == connector) {
 544                                 new_encoder = connector_funcs->best_encoder(connector);
 545                                 /* if we can't get an encoder for a connector
 546                                    we are setting now - then fail */
 547                                 if (new_encoder == NULL)
 548                                         /* don't break so fail path works correct */
 549                                         fail = 1;
 550
 551                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 552                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 553                                         mode_changed = true;
 554                                 }
 555
 556                                 break;
 557                         }
 558                 }
 559
 560                 if (new_encoder != connector->encoder) {
 561                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 562                         mode_changed = true;
 563                         /* If the encoder is reused for another connector, then
 564                          * the appropriate crtc will be set later.
 565                          */
 566                         if (connector->encoder)
 567                                 connector->encoder->crtc = NULL;
 568                         connector->encoder = new_encoder;
 569                 }
 570         }
 571
 572         if (fail) {
 573                 ret = -EINVAL;
 574                 goto fail;
 575         }
 576
 577         count = 0;
 578         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 579                 if (!connector->encoder)
 580                         continue;
 581
 582                 if (connector->encoder->crtc == set->crtc)
 583                         new_crtc = NULL;
 584                 else
 585                         new_crtc = connector->encoder->crtc;
 586
 587                 for (ro = 0; ro < set->num_connectors; ro++) {
 588                         if (set->connectors[ro] == connector)
 589                                 new_crtc = set->crtc;
 590                 }
 591
 592                 /* Make sure the new CRTC will work with the encoder */
 593                 if (new_crtc &&
 594                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 595                         ret = -EINVAL;
 596                         goto fail;
 597                 }
 598                 if (new_crtc != connector->encoder->crtc) {
 599                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 600                         mode_changed = true;
 601                         connector->encoder->crtc = new_crtc;
 602                 }
 603                 if (new_crtc) {
 604                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 605                                 connector->base.id, connector->name,
 606                                 new_crtc->base.id);
 607                 } else {
 608                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 609                                 connector->base.id, connector->name);
 610                 }
 611         }
 612
 613         /* mode_set_base is not a required function */
 614         if (fb_changed && !crtc_funcs->mode_set_base)
 615                 mode_changed = true;
 616
 617         if (mode_changed) {
 618                 if (drm_helper_crtc_in_use(set->crtc)) {
 619                         DRM_DEBUG_KMS("attempting to set mode from"
 620                                         " userspace\n");
 621                         drm_mode_debug_printmodeline(set->mode);
 622                         set->crtc->primary->fb = set->fb;
 623                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 624                                                       set->x, set->y,
 625                                                       save_set.fb)) {
 626                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 627                                           set->crtc->base.id);
 628                                 set->crtc->primary->fb = save_set.fb;
 629                                 ret = -EINVAL;
 630                                 goto fail;
 631                         }
 632                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 633                         for (i = 0; i < set->num_connectors; i++) {
 634                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 635                                               set->connectors[i]->name);
 636                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 637                         }
 638                 }
 639                 __drm_helper_disable_unused_functions(dev);
 640         } else if (fb_changed) {
 641                 set->crtc->x = set->x;
 642                 set->crtc->y = set->y;
 643                 set->crtc->primary->fb = set->fb;
 644                 ret = crtc_funcs->mode_set_base(set->crtc,
 645                                                 set->x, set->y, save_set.fb);
 646                 if (ret != 0) {
 647                         set->crtc->x = save_set.x;
 648                         set->crtc->y = save_set.y;
 649                         set->crtc->primary->fb = save_set.fb;
 650                         goto fail;
 651                 }
 652         }
 653
 654         kfree(save_connectors);
 655         kfree(save_encoders);
 656         return 0;
 657
 658 fail:
 659         /* Restore all previous data. */
 660         count = 0;
 661         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 662                 *encoder = save_encoders[count++];
 663         }
 664
 665         count = 0;
 666         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 667                 *connector = save_connectors[count++];
 668         }
 669
 670         /* Try to restore the config */
 671         if (mode_changed &&
 672             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 673                                       save_set.y, save_set.fb))
 674                 DRM_ERROR("failed to restore config after modeset failure\n");
 675
 676         kfree(save_connectors);
 677         kfree(save_encoders);
 678         return ret;
 679 }
 680 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 681
 682 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 683 {
 684         int dpms = DRM_MODE_DPMS_OFF;
 685         struct drm_connector *connector;
 686         struct drm_device *dev = encoder->dev;
 687
 688         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 689                 if (connector->encoder == encoder)
 690                         if (connector->dpms < dpms)
 691                                 dpms = connector->dpms;
 692         return dpms;
 693 }
 694
 695 /* Helper which handles bridge ordering around encoder dpms */
 696 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 697 {
 698         struct drm_bridge *bridge = encoder->bridge;
 699         struct drm_encoder_helper_funcs *encoder_funcs;
 700
 701         if (bridge) {
 702                 if (mode == DRM_MODE_DPMS_ON)
 703                         bridge->funcs->pre_enable(bridge);
 704                 else
 705                         bridge->funcs->disable(bridge);
 706         }
 707
 708         encoder_funcs = encoder->helper_private;
 709         if (encoder_funcs->dpms)
 710                 encoder_funcs->dpms(encoder, mode);
 711
 712         if (bridge) {
 713                 if (mode == DRM_MODE_DPMS_ON)
 714                         bridge->funcs->enable(bridge);
 715                 else
 716                         bridge->funcs->post_disable(bridge);
 717         }
 718 }
 719
 720 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 721 {
 722         int dpms = DRM_MODE_DPMS_OFF;
 723         struct drm_connector *connector;
 724         struct drm_device *dev = crtc->dev;
 725
 726         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 727                 if (connector->encoder && connector->encoder->crtc == crtc)
 728                         if (connector->dpms < dpms)
 729                                 dpms = connector->dpms;
 730         return dpms;
 731 }
 732
 733 /**
 734  * drm_helper_connector_dpms() - connector dpms helper implementation
 735  * @connector: affected connector
 736  * @mode: DPMS mode
 737  *
 738  * This is the main helper function provided by the crtc helper framework for
 739  * implementing the DPMS connector attribute. It computes the new desired DPMS
 740  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 741  * callback provided by the driver appropriately.
 742  */
 743 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 744 {
 745         struct drm_encoder *encoder = connector->encoder;
 746         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 747         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 748
 749         if (mode == connector->dpms)
 750                 return;
 751
 752         old_dpms = connector->dpms;
 753         connector->dpms = mode;
 754
 755         if (encoder)
 756                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 757
 758         /* from off to on, do crtc then encoder */
 759         if (mode < old_dpms) {
 760                 if (crtc) {
 761                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 762                         if (crtc_funcs->dpms)
 763                                 (*crtc_funcs->dpms) (crtc,
 764                                                      drm_helper_choose_crtc_dpms(crtc));
 765                 }
 766                 if (encoder)
 767                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 768         }
 769
 770         /* from on to off, do encoder then crtc */
 771         if (mode > old_dpms) {
 772                 if (encoder)
 773                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 774                 if (crtc) {
 775                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 776                         if (crtc_funcs->dpms)
 777                                 (*crtc_funcs->dpms) (crtc,
 778                                                      drm_helper_choose_crtc_dpms(crtc));
 779                 }
 780         }
 781
 782         return;
 783 }
 784 EXPORT_SYMBOL(drm_helper_connector_dpms);
 785
 786 /**
 787  * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
 788  * @fb: drm_framebuffer object to fill out
 789  * @mode_cmd: metadata from the userspace fb creation request
 790  *
 791  * This helper can be used in a drivers fb_create callback to pre-fill the fb's
 792  * metadata fields.
 793  */
 794 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 795                                     struct drm_mode_fb_cmd2 *mode_cmd)
 796 {
 797         int i;
 798
 799         fb->width = mode_cmd->width;
 800         fb->height = mode_cmd->height;
 801         for (i = 0; i < 4; i++) {
 802                 fb->pitches[i] = mode_cmd->pitches[i];
 803                 fb->offsets[i] = mode_cmd->offsets[i];
 804         }
 805         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 806                                     &fb->bits_per_pixel);
 807         fb->pixel_format = mode_cmd->pixel_format;
 808 }
 809 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 810
 811 /**
 812  * drm_helper_resume_force_mode - force-restore mode setting configuration
 813  * @dev: drm_device which should be restored
 814  *
 815  * Drivers which use the mode setting helpers can use this function to
 816  * force-restore the mode setting configuration e.g. on resume or when something
 817  * else might have trampled over the hw state (like some overzealous old BIOSen
 818  * tended to do).
 819  *
 820  * This helper doesn't provide a error return value since restoring the old
 821  * config should never fail due to resource allocation issues since the driver
 822  * has successfully set the restored configuration already. Hence this should
 823  * boil down to the equivalent of a few dpms on calls, which also don't provide
 824  * an error code.
 825  *
 826  * Drivers where simply restoring an old configuration again might fail (e.g.
 827  * due to slight differences in allocating shared resources when the
 828  * configuration is restored in a different order than when userspace set it up)
 829  * need to use their own restore logic.
 830  */
 831 void drm_helper_resume_force_mode(struct drm_device *dev)
 832 {
 833         struct drm_crtc *crtc;
 834         struct drm_encoder *encoder;
 835         struct drm_crtc_helper_funcs *crtc_funcs;
 836         int encoder_dpms;
 837         bool ret;
 838
 839         drm_modeset_lock_all(dev);
 840         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 841
 842                 if (!crtc->enabled)
 843                         continue;
 844
 845                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 846                                                crtc->x, crtc->y, crtc->primary->fb);
 847
 848                 /* Restoring the old config should never fail! */
 849                 if (ret == false)
 850                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 851
 852                 /* Turn off outputs that were already powered off */
 853                 if (drm_helper_choose_crtc_dpms(crtc)) {
 854                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 855
 856                                 if(encoder->crtc != crtc)
 857                                         continue;
 858
 859                                 encoder_dpms = drm_helper_choose_encoder_dpms(
 860                                                         encoder);
 861
 862                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
 863                         }
 864
 865                         crtc_funcs = crtc->helper_private;
 866                         if (crtc_funcs->dpms)
 867                                 (*crtc_funcs->dpms) (crtc,
 868                                                      drm_helper_choose_crtc_dpms(crtc));
 869                 }
 870         }
 871
 872         /* disable the unused connectors while restoring the modesetting */
 873         __drm_helper_disable_unused_functions(dev);
 874         drm_modeset_unlock_all(dev);
 875 }
 876 EXPORT_SYMBOL(drm_helper_resume_force_mode);