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