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/kernel.h>
  33 #include <linux/export.h>
  34 #include <linux/moduleparam.h>
  35
  36 #include <drm/drmP.h>
  37 #include <drm/drm_atomic.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_fourcc.h>
  40 #include <drm/drm_crtc_helper.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_plane_helper.h>
  43 #include <drm/drm_atomic_helper.h>
  44 #include <drm/drm_edid.h>
  45
  46 /**
  47  * DOC: overview
  48  *
  49  * The CRTC modeset helper library provides a default set_config implementation
  50  * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
  51  * the same callbacks which drivers can use to e.g. restore the modeset
  52  * configuration on resume with drm_helper_resume_force_mode().
  53  *
  54  * The driver callbacks are mostly compatible with the atomic modeset helpers,
  55  * except for the handling of the primary plane: Atomic helpers require that the
  56  * primary plane is implemented as a real standalone plane and not directly tied
  57  * to the CRTC state. For easier transition this library provides functions to
  58  * implement the old semantics required by the CRTC helpers using the new plane
  59  * and atomic helper callbacks.
  60  *
  61  * Drivers are strongly urged to convert to the atomic helpers (by way of first
  62  * converting to the plane helpers). New drivers must not use these functions
  63  * but need to implement the atomic interface instead, potentially using the
  64  * atomic helpers for that.
  65  */
  66 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  67 MODULE_DESCRIPTION("DRM KMS helper");
  68 MODULE_LICENSE("GPL and additional rights");
  69
  70 /**
  71  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  72  *                                              connector list
  73  * @dev: drm device to operate on
  74  *
  75  * Some userspace presumes that the first connected connector is the main
  76  * display, where it's supposed to display e.g. the login screen. For
  77  * laptops, this should be the main panel. Use this function to sort all
  78  * (eDP/LVDS) panels to the front of the connector list, instead of
  79  * painstakingly trying to initialize them in the right order.
  80  */
  81 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  82 {
  83         struct drm_connector *connector, *tmp;
  84         struct list_head panel_list;
  85
  86         INIT_LIST_HEAD(&panel_list);
  87
  88         list_for_each_entry_safe(connector, tmp,
  89                                  &dev->mode_config.connector_list, head) {
  90                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  91                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  92                         list_move_tail(&connector->head, &panel_list);
  93         }
  94
  95         list_splice(&panel_list, &dev->mode_config.connector_list);
  96 }
  97 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  98
  99 /**
 100  * drm_helper_encoder_in_use - check if a given encoder is in use
 101  * @encoder: encoder to check
 102  *
 103  * Checks whether @encoder is with the current mode setting output configuration
 104  * in use by any connector. This doesn't mean that it is actually enabled since
 105  * the DPMS state is tracked separately.
 106  *
 107  * Returns:
 108  * True if @encoder is used, false otherwise.
 109  */
 110 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 111 {
 112         struct drm_connector *connector;
 113         struct drm_device *dev = encoder->dev;
 114
 115         /*
 116          * We can expect this mutex to be locked if we are not panicking.
 117          * Locking is currently fubar in the panic handler.
 118          */
 119         if (!oops_in_progress) {
 120                 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 121                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 122         }
 123
 124         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 125                 if (connector->encoder == encoder)
 126                         return true;
 127         return false;
 128 }
 129 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 130
 131 /**
 132  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 133  * @crtc: CRTC to check
 134  *
 135  * Checks whether @crtc is with the current mode setting output configuration
 136  * in use by any connector. This doesn't mean that it is actually enabled since
 137  * the DPMS state is tracked separately.
 138  *
 139  * Returns:
 140  * True if @crtc is used, false otherwise.
 141  */
 142 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 143 {
 144         struct drm_encoder *encoder;
 145         struct drm_device *dev = crtc->dev;
 146
 147         /*
 148          * We can expect this mutex to be locked if we are not panicking.
 149          * Locking is currently fubar in the panic handler.
 150          */
 151         if (!oops_in_progress)
 152                 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 153
 154         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 155                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 156                         return true;
 157         return false;
 158 }
 159 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 160
 161 static void
 162 drm_encoder_disable(struct drm_encoder *encoder)
 163 {
 164         const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 165
 166         drm_bridge_disable(encoder->bridge);
 167
 168         if (encoder_funcs->disable)
 169                 (*encoder_funcs->disable)(encoder);
 170         else
 171                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 172
 173         drm_bridge_post_disable(encoder->bridge);
 174 }
 175
 176 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
 177 {
 178         struct drm_encoder *encoder;
 179         struct drm_crtc *crtc;
 180
 181         drm_warn_on_modeset_not_all_locked(dev);
 182
 183         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 184                 if (!drm_helper_encoder_in_use(encoder)) {
 185                         drm_encoder_disable(encoder);
 186                         /* disconnect encoder from any connector */
 187                         encoder->crtc = NULL;
 188                 }
 189         }
 190
 191         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 192                 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 193                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 194                 if (!crtc->enabled) {
 195                         if (crtc_funcs->disable)
 196                                 (*crtc_funcs->disable)(crtc);
 197                         else
 198                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 199                         crtc->primary->fb = NULL;
 200                 }
 201         }
 202 }
 203
 204 /**
 205  * drm_helper_disable_unused_functions - disable unused objects
 206  * @dev: DRM device
 207  *
 208  * This function walks through the entire mode setting configuration of @dev. It
 209  * will remove any crtc links of unused encoders and encoder links of
 210  * disconnected connectors. Then it will disable all unused encoders and crtcs
 211  * either by calling their disable callback if available or by calling their
 212  * dpms callback with DRM_MODE_DPMS_OFF.
 213  */
 214 void drm_helper_disable_unused_functions(struct drm_device *dev)
 215 {
 216         drm_modeset_lock_all(dev);
 217         __drm_helper_disable_unused_functions(dev);
 218         drm_modeset_unlock_all(dev);
 219 }
 220 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 221
 222 /*
 223  * Check the CRTC we're going to map each output to vs. its current
 224  * CRTC.  If they don't match, we have to disable the output and the CRTC
 225  * since the driver will have to re-route things.
 226  */
 227 static void
 228 drm_crtc_prepare_encoders(struct drm_device *dev)
 229 {
 230         const struct drm_encoder_helper_funcs *encoder_funcs;
 231         struct drm_encoder *encoder;
 232
 233         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 234                 encoder_funcs = encoder->helper_private;
 235                 /* Disable unused encoders */
 236                 if (encoder->crtc == NULL)
 237                         drm_encoder_disable(encoder);
 238                 /* Disable encoders whose CRTC is about to change */
 239                 if (encoder_funcs->get_crtc &&
 240                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 241                         drm_encoder_disable(encoder);
 242         }
 243 }
 244
 245 /**
 246  * drm_crtc_helper_set_mode - internal helper to set a mode
 247  * @crtc: CRTC to program
 248  * @mode: mode to use
 249  * @x: horizontal offset into the surface
 250  * @y: vertical offset into the surface
 251  * @old_fb: old framebuffer, for cleanup
 252  *
 253  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 254  * to fixup or reject the mode prior to trying to set it. This is an internal
 255  * helper that drivers could e.g. use to update properties that require the
 256  * entire output pipe to be disabled and re-enabled in a new configuration. For
 257  * example for changing whether audio is enabled on a hdmi link or for changing
 258  * panel fitter or dither attributes. It is also called by the
 259  * drm_crtc_helper_set_config() helper function to drive the mode setting
 260  * sequence.
 261  *
 262  * Returns:
 263  * True if the mode was set successfully, false otherwise.
 264  */
 265 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 266                               struct drm_display_mode *mode,
 267                               int x, int y,
 268                               struct drm_framebuffer *old_fb)
 269 {
 270         struct drm_device *dev = crtc->dev;
 271         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 272         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 273         const struct drm_encoder_helper_funcs *encoder_funcs;
 274         int saved_x, saved_y;
 275         bool saved_enabled;
 276         struct drm_encoder *encoder;
 277         bool ret = true;
 278
 279         drm_warn_on_modeset_not_all_locked(dev);
 280
 281         saved_enabled = crtc->enabled;
 282         crtc->enabled = drm_helper_crtc_in_use(crtc);
 283         if (!crtc->enabled)
 284                 return true;
 285
 286         adjusted_mode = drm_mode_duplicate(dev, mode);
 287         if (!adjusted_mode) {
 288                 crtc->enabled = saved_enabled;
 289                 return false;
 290         }
 291
 292         saved_mode = crtc->mode;
 293         saved_hwmode = crtc->hwmode;
 294         saved_x = crtc->x;
 295         saved_y = crtc->y;
 296
 297         /* Update crtc values up front so the driver can rely on them for mode
 298          * setting.
 299          */
 300         crtc->mode = *mode;
 301         crtc->x = x;
 302         crtc->y = y;
 303
 304         /* Pass our mode to the connectors and the CRTC to give them a chance to
 305          * adjust it according to limitations or connector properties, and also
 306          * a chance to reject the mode entirely.
 307          */
 308         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 309
 310                 if (encoder->crtc != crtc)
 311                         continue;
 312
 313                 ret = drm_bridge_mode_fixup(encoder->bridge,
 314                         mode, adjusted_mode);
 315                 if (!ret) {
 316                         DRM_DEBUG_KMS("Bridge fixup failed\n");
 317                         goto done;
 318                 }
 319
 320                 encoder_funcs = encoder->helper_private;
 321                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 322                                                       adjusted_mode))) {
 323                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 324                         goto done;
 325                 }
 326         }
 327
 328         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 329                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 330                 goto done;
 331         }
 332         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 333
 334         crtc->hwmode = *adjusted_mode;
 335
 336         /* Prepare the encoders and CRTCs before setting the mode. */
 337         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 338
 339                 if (encoder->crtc != crtc)
 340                         continue;
 341
 342                 drm_bridge_disable(encoder->bridge);
 343
 344                 encoder_funcs = encoder->helper_private;
 345                 /* Disable the encoders as the first thing we do. */
 346                 encoder_funcs->prepare(encoder);
 347
 348                 drm_bridge_post_disable(encoder->bridge);
 349         }
 350
 351         drm_crtc_prepare_encoders(dev);
 352
 353         crtc_funcs->prepare(crtc);
 354
 355         /* Set up the DPLL and any encoders state that needs to adjust or depend
 356          * on the DPLL.
 357          */
 358         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 359         if (!ret)
 360             goto done;
 361
 362         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 363
 364                 if (encoder->crtc != crtc)
 365                         continue;
 366
 367                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 368                         encoder->base.id, encoder->name,
 369                         mode->base.id, mode->name);
 370                 encoder_funcs = encoder->helper_private;
 371                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 372
 373                 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
 374         }
 375
 376         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 377         crtc_funcs->commit(crtc);
 378
 379         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 380
 381                 if (encoder->crtc != crtc)
 382                         continue;
 383
 384                 drm_bridge_pre_enable(encoder->bridge);
 385
 386                 encoder_funcs = encoder->helper_private;
 387                 encoder_funcs->commit(encoder);
 388
 389                 drm_bridge_enable(encoder->bridge);
 390         }
 391
 392         /* Calculate and store various constants which
 393          * are later needed by vblank and swap-completion
 394          * timestamping. They are derived from true hwmode.
 395          */
 396         drm_calc_timestamping_constants(crtc, &crtc->hwmode);
 397
 398         /* FIXME: add subpixel order */
 399 done:
 400         drm_mode_destroy(dev, adjusted_mode);
 401         if (!ret) {
 402                 crtc->enabled = saved_enabled;
 403                 crtc->mode = saved_mode;
 404                 crtc->hwmode = saved_hwmode;
 405                 crtc->x = saved_x;
 406                 crtc->y = saved_y;
 407         }
 408
 409         return ret;
 410 }
 411 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 412
 413 static void
 414 drm_crtc_helper_disable(struct drm_crtc *crtc)
 415 {
 416         struct drm_device *dev = crtc->dev;
 417         struct drm_connector *connector;
 418         struct drm_encoder *encoder;
 419
 420         /* Decouple all encoders and their attached connectors from this crtc */
 421         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 422                 if (encoder->crtc != crtc)
 423                         continue;
 424
 425                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 426                         if (connector->encoder != encoder)
 427                                 continue;
 428
 429                         connector->encoder = NULL;
 430
 431                         /*
 432                          * drm_helper_disable_unused_functions() ought to be
 433                          * doing this, but since we've decoupled the encoder
 434                          * from the connector above, the required connection
 435                          * between them is henceforth no longer available.
 436                          */
 437                         connector->dpms = DRM_MODE_DPMS_OFF;
 438                 }
 439         }
 440
 441         __drm_helper_disable_unused_functions(dev);
 442 }
 443
 444 /**
 445  * drm_crtc_helper_set_config - set a new config from userspace
 446  * @set: mode set configuration
 447  *
 448  * Setup a new configuration, provided by the upper layers (either an ioctl call
 449  * from userspace or internally e.g. from the fbdev support code) in @set, and
 450  * enable it. This is the main helper functions for drivers that implement
 451  * kernel mode setting with the crtc helper functions and the assorted
 452  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 453  *
 454  * Returns:
 455  * Returns 0 on success, negative errno numbers on failure.
 456  */
 457 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 458 {
 459         struct drm_device *dev;
 460         struct drm_crtc *new_crtc;
 461         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 462         bool mode_changed = false; /* if true do a full mode set */
 463         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 464         struct drm_connector *save_connectors, *connector;
 465         int count = 0, ro, fail = 0;
 466         const struct drm_crtc_helper_funcs *crtc_funcs;
 467         struct drm_mode_set save_set;
 468         int ret;
 469         int i;
 470
 471         DRM_DEBUG_KMS("\n");
 472
 473         BUG_ON(!set);
 474         BUG_ON(!set->crtc);
 475         BUG_ON(!set->crtc->helper_private);
 476
 477         /* Enforce sane interface api - has been abused by the fb helper. */
 478         BUG_ON(!set->mode && set->fb);
 479         BUG_ON(set->fb && set->num_connectors == 0);
 480
 481         crtc_funcs = set->crtc->helper_private;
 482
 483         if (!set->mode)
 484                 set->fb = NULL;
 485
 486         if (set->fb) {
 487                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 488                                 set->crtc->base.id, set->fb->base.id,
 489                                 (int)set->num_connectors, set->x, set->y);
 490         } else {
 491                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 492                 drm_crtc_helper_disable(set->crtc);
 493                 return 0;
 494         }
 495
 496         dev = set->crtc->dev;
 497
 498         drm_warn_on_modeset_not_all_locked(dev);
 499
 500         /*
 501          * Allocate space for the backup of all (non-pointer) encoder and
 502          * connector data.
 503          */
 504         save_encoders = kzalloc(dev->mode_config.num_encoder *
 505                                 sizeof(struct drm_encoder), GFP_KERNEL);
 506         if (!save_encoders)
 507                 return -ENOMEM;
 508
 509         save_connectors = kzalloc(dev->mode_config.num_connector *
 510                                 sizeof(struct drm_connector), GFP_KERNEL);
 511         if (!save_connectors) {
 512                 kfree(save_encoders);
 513                 return -ENOMEM;
 514         }
 515
 516         /*
 517          * Copy data. Note that driver private data is not affected.
 518          * Should anything bad happen only the expected state is
 519          * restored, not the drivers personal bookkeeping.
 520          */
 521         count = 0;
 522         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 523                 save_encoders[count++] = *encoder;
 524         }
 525
 526         count = 0;
 527         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 528                 save_connectors[count++] = *connector;
 529         }
 530
 531         save_set.crtc = set->crtc;
 532         save_set.mode = &set->crtc->mode;
 533         save_set.x = set->crtc->x;
 534         save_set.y = set->crtc->y;
 535         save_set.fb = set->crtc->primary->fb;
 536
 537         /* We should be able to check here if the fb has the same properties
 538          * and then just flip_or_move it */
 539         if (set->crtc->primary->fb != set->fb) {
 540                 /* If we have no fb then treat it as a full mode set */
 541                 if (set->crtc->primary->fb == NULL) {
 542                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 543                         mode_changed = true;
 544                 } else if (set->fb == NULL) {
 545                         mode_changed = true;
 546                 } else if (set->fb->pixel_format !=
 547                            set->crtc->primary->fb->pixel_format) {
 548                         mode_changed = true;
 549                 } else
 550                         fb_changed = true;
 551         }
 552
 553         if (set->x != set->crtc->x || set->y != set->crtc->y)
 554                 fb_changed = true;
 555
 556         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 557                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 558                 drm_mode_debug_printmodeline(&set->crtc->mode);
 559                 drm_mode_debug_printmodeline(set->mode);
 560                 mode_changed = true;
 561         }
 562
 563         /* a) traverse passed in connector list and get encoders for them */
 564         count = 0;
 565         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 566                 const struct drm_connector_helper_funcs *connector_funcs =
 567                         connector->helper_private;
 568                 new_encoder = connector->encoder;
 569                 for (ro = 0; ro < set->num_connectors; ro++) {
 570                         if (set->connectors[ro] == connector) {
 571                                 new_encoder = connector_funcs->best_encoder(connector);
 572                                 /* if we can't get an encoder for a connector
 573                                    we are setting now - then fail */
 574                                 if (new_encoder == NULL)
 575                                         /* don't break so fail path works correct */
 576                                         fail = 1;
 577
 578                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 579                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 580                                         mode_changed = true;
 581                                 }
 582
 583                                 break;
 584                         }
 585                 }
 586
 587                 if (new_encoder != connector->encoder) {
 588                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 589                         mode_changed = true;
 590                         /* If the encoder is reused for another connector, then
 591                          * the appropriate crtc will be set later.
 592                          */
 593                         if (connector->encoder)
 594                                 connector->encoder->crtc = NULL;
 595                         connector->encoder = new_encoder;
 596                 }
 597         }
 598
 599         if (fail) {
 600                 ret = -EINVAL;
 601                 goto fail;
 602         }
 603
 604         count = 0;
 605         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 606                 if (!connector->encoder)
 607                         continue;
 608
 609                 if (connector->encoder->crtc == set->crtc)
 610                         new_crtc = NULL;
 611                 else
 612                         new_crtc = connector->encoder->crtc;
 613
 614                 for (ro = 0; ro < set->num_connectors; ro++) {
 615                         if (set->connectors[ro] == connector)
 616                                 new_crtc = set->crtc;
 617                 }
 618
 619                 /* Make sure the new CRTC will work with the encoder */
 620                 if (new_crtc &&
 621                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 622                         ret = -EINVAL;
 623                         goto fail;
 624                 }
 625                 if (new_crtc != connector->encoder->crtc) {
 626                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 627                         mode_changed = true;
 628                         connector->encoder->crtc = new_crtc;
 629                 }
 630                 if (new_crtc) {
 631                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 632                                 connector->base.id, connector->name,
 633                                 new_crtc->base.id);
 634                 } else {
 635                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 636                                 connector->base.id, connector->name);
 637                 }
 638         }
 639
 640         /* mode_set_base is not a required function */
 641         if (fb_changed && !crtc_funcs->mode_set_base)
 642                 mode_changed = true;
 643
 644         if (mode_changed) {
 645                 if (drm_helper_crtc_in_use(set->crtc)) {
 646                         DRM_DEBUG_KMS("attempting to set mode from"
 647                                         " userspace\n");
 648                         drm_mode_debug_printmodeline(set->mode);
 649                         set->crtc->primary->fb = set->fb;
 650                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 651                                                       set->x, set->y,
 652                                                       save_set.fb)) {
 653                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 654                                           set->crtc->base.id);
 655                                 set->crtc->primary->fb = save_set.fb;
 656                                 ret = -EINVAL;
 657                                 goto fail;
 658                         }
 659                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 660                         for (i = 0; i < set->num_connectors; i++) {
 661                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 662                                               set->connectors[i]->name);
 663                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 664                         }
 665                 }
 666                 __drm_helper_disable_unused_functions(dev);
 667         } else if (fb_changed) {
 668                 set->crtc->x = set->x;
 669                 set->crtc->y = set->y;
 670                 set->crtc->primary->fb = set->fb;
 671                 ret = crtc_funcs->mode_set_base(set->crtc,
 672                                                 set->x, set->y, save_set.fb);
 673                 if (ret != 0) {
 674                         set->crtc->x = save_set.x;
 675                         set->crtc->y = save_set.y;
 676                         set->crtc->primary->fb = save_set.fb;
 677                         goto fail;
 678                 }
 679         }
 680
 681         kfree(save_connectors);
 682         kfree(save_encoders);
 683         return 0;
 684
 685 fail:
 686         /* Restore all previous data. */
 687         count = 0;
 688         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 689                 *encoder = save_encoders[count++];
 690         }
 691
 692         count = 0;
 693         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 694                 *connector = save_connectors[count++];
 695         }
 696
 697         /* Try to restore the config */
 698         if (mode_changed &&
 699             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 700                                       save_set.y, save_set.fb))
 701                 DRM_ERROR("failed to restore config after modeset failure\n");
 702
 703         kfree(save_connectors);
 704         kfree(save_encoders);
 705         return ret;
 706 }
 707 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 708
 709 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 710 {
 711         int dpms = DRM_MODE_DPMS_OFF;
 712         struct drm_connector *connector;
 713         struct drm_device *dev = encoder->dev;
 714
 715         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 716                 if (connector->encoder == encoder)
 717                         if (connector->dpms < dpms)
 718                                 dpms = connector->dpms;
 719         return dpms;
 720 }
 721
 722 /* Helper which handles bridge ordering around encoder dpms */
 723 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 724 {
 725         struct drm_bridge *bridge = encoder->bridge;
 726         const struct drm_encoder_helper_funcs *encoder_funcs;
 727
 728         if (mode == DRM_MODE_DPMS_ON)
 729                 drm_bridge_pre_enable(bridge);
 730         else
 731                 drm_bridge_disable(bridge);
 732
 733         encoder_funcs = encoder->helper_private;
 734         if (encoder_funcs->dpms)
 735                 encoder_funcs->dpms(encoder, mode);
 736
 737         if (mode == DRM_MODE_DPMS_ON)
 738                 drm_bridge_enable(bridge);
 739         else
 740                 drm_bridge_post_disable(bridge);
 741 }
 742
 743 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 744 {
 745         int dpms = DRM_MODE_DPMS_OFF;
 746         struct drm_connector *connector;
 747         struct drm_device *dev = crtc->dev;
 748
 749         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 750                 if (connector->encoder && connector->encoder->crtc == crtc)
 751                         if (connector->dpms < dpms)
 752                                 dpms = connector->dpms;
 753         return dpms;
 754 }
 755
 756 /**
 757  * drm_helper_connector_dpms() - connector dpms helper implementation
 758  * @connector: affected connector
 759  * @mode: DPMS mode
 760  *
 761  * This is the main helper function provided by the crtc helper framework for
 762  * implementing the DPMS connector attribute. It computes the new desired DPMS
 763  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 764  * callback provided by the driver appropriately.
 765  */
 766 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 767 {
 768         struct drm_encoder *encoder = connector->encoder;
 769         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 770         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 771
 772         if (mode == connector->dpms)
 773                 return;
 774
 775         old_dpms = connector->dpms;
 776         connector->dpms = mode;
 777
 778         if (encoder)
 779                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 780
 781         /* from off to on, do crtc then encoder */
 782         if (mode < old_dpms) {
 783                 if (crtc) {
 784                         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 785                         if (crtc_funcs->dpms)
 786                                 (*crtc_funcs->dpms) (crtc,
 787                                                      drm_helper_choose_crtc_dpms(crtc));
 788                 }
 789                 if (encoder)
 790                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 791         }
 792
 793         /* from on to off, do encoder then crtc */
 794         if (mode > old_dpms) {
 795                 if (encoder)
 796                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 797                 if (crtc) {
 798                         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 799                         if (crtc_funcs->dpms)
 800                                 (*crtc_funcs->dpms) (crtc,
 801                                                      drm_helper_choose_crtc_dpms(crtc));
 802                 }
 803         }
 804
 805         return;
 806 }
 807 EXPORT_SYMBOL(drm_helper_connector_dpms);
 808
 809 /**
 810  * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
 811  * @fb: drm_framebuffer object to fill out
 812  * @mode_cmd: metadata from the userspace fb creation request
 813  *
 814  * This helper can be used in a drivers fb_create callback to pre-fill the fb's
 815  * metadata fields.
 816  */
 817 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 818                                     struct drm_mode_fb_cmd2 *mode_cmd)
 819 {
 820         int i;
 821
 822         fb->width = mode_cmd->width;
 823         fb->height = mode_cmd->height;
 824         for (i = 0; i < 4; i++) {
 825                 fb->pitches[i] = mode_cmd->pitches[i];
 826                 fb->offsets[i] = mode_cmd->offsets[i];
 827                 fb->modifier[i] = mode_cmd->modifier[i];
 828         }
 829         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 830                                     &fb->bits_per_pixel);
 831         fb->pixel_format = mode_cmd->pixel_format;
 832         fb->flags = mode_cmd->flags;
 833 }
 834 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 835
 836 /**
 837  * drm_helper_resume_force_mode - force-restore mode setting configuration
 838  * @dev: drm_device which should be restored
 839  *
 840  * Drivers which use the mode setting helpers can use this function to
 841  * force-restore the mode setting configuration e.g. on resume or when something
 842  * else might have trampled over the hw state (like some overzealous old BIOSen
 843  * tended to do).
 844  *
 845  * This helper doesn't provide a error return value since restoring the old
 846  * config should never fail due to resource allocation issues since the driver
 847  * has successfully set the restored configuration already. Hence this should
 848  * boil down to the equivalent of a few dpms on calls, which also don't provide
 849  * an error code.
 850  *
 851  * Drivers where simply restoring an old configuration again might fail (e.g.
 852  * due to slight differences in allocating shared resources when the
 853  * configuration is restored in a different order than when userspace set it up)
 854  * need to use their own restore logic.
 855  */
 856 void drm_helper_resume_force_mode(struct drm_device *dev)
 857 {
 858         struct drm_crtc *crtc;
 859         struct drm_encoder *encoder;
 860         const struct drm_crtc_helper_funcs *crtc_funcs;
 861         int encoder_dpms;
 862         bool ret;
 863
 864         drm_modeset_lock_all(dev);
 865         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 866
 867                 if (!crtc->enabled)
 868                         continue;
 869
 870                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 871                                                crtc->x, crtc->y, crtc->primary->fb);
 872
 873                 /* Restoring the old config should never fail! */
 874                 if (ret == false)
 875                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 876
 877                 /* Turn off outputs that were already powered off */
 878                 if (drm_helper_choose_crtc_dpms(crtc)) {
 879                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 880
 881                                 if(encoder->crtc != crtc)
 882                                         continue;
 883
 884                                 encoder_dpms = drm_helper_choose_encoder_dpms(
 885                                                         encoder);
 886
 887                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
 888                         }
 889
 890                         crtc_funcs = crtc->helper_private;
 891                         if (crtc_funcs->dpms)
 892                                 (*crtc_funcs->dpms) (crtc,
 893                                                      drm_helper_choose_crtc_dpms(crtc));
 894                 }
 895         }
 896
 897         /* disable the unused connectors while restoring the modesetting */
 898         __drm_helper_disable_unused_functions(dev);
 899         drm_modeset_unlock_all(dev);
 900 }
 901 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 902
 903 /**
 904  * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
 905  * @crtc: DRM CRTC
 906  * @mode: DRM display mode which userspace requested
 907  * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
 908  * @x: x offset of the CRTC scanout area on the underlying framebuffer
 909  * @y: y offset of the CRTC scanout area on the underlying framebuffer
 910  * @old_fb: previous framebuffer
 911  *
 912  * This function implements a callback useable as the ->mode_set callback
 913  * required by the crtc helpers. Besides the atomic plane helper functions for
 914  * the primary plane the driver must also provide the ->mode_set_nofb callback
 915  * to set up the crtc.
 916  *
 917  * This is a transitional helper useful for converting drivers to the atomic
 918  * interfaces.
 919  */
 920 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 921                              struct drm_display_mode *adjusted_mode, int x, int y,
 922                              struct drm_framebuffer *old_fb)
 923 {
 924         struct drm_crtc_state *crtc_state;
 925         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 926         int ret;
 927
 928         if (crtc->funcs->atomic_duplicate_state)
 929                 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
 930         else {
 931                 crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL);
 932                 if (!crtc_state)
 933                         return -ENOMEM;
 934                 if (crtc->state)
 935                         __drm_atomic_helper_crtc_duplicate_state(crtc, crtc_state);
 936                 else
 937                         crtc_state->crtc = crtc;
 938         }
 939
 940         crtc_state->planes_changed = true;
 941         crtc_state->mode_changed = true;
 942         ret = drm_atomic_set_mode_for_crtc(crtc_state, mode);
 943         if (ret)
 944                 goto out;
 945         drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
 946
 947         if (crtc_funcs->atomic_check) {
 948                 ret = crtc_funcs->atomic_check(crtc, crtc_state);
 949                 if (ret)
 950                         goto out;
 951         }
 952
 953         swap(crtc->state, crtc_state);
 954
 955         crtc_funcs->mode_set_nofb(crtc);
 956
 957         ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
 958
 959 out:
 960         if (crtc->funcs->atomic_destroy_state)
 961                 crtc->funcs->atomic_destroy_state(crtc, crtc_state);
 962         else {
 963                 __drm_atomic_helper_crtc_destroy_state(crtc, crtc_state);
 964                 kfree(crtc_state);
 965         }
 966
 967         return ret;
 968 }
 969 EXPORT_SYMBOL(drm_helper_crtc_mode_set);
 970
 971 /**
 972  * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
 973  * @crtc: DRM CRTC
 974  * @x: x offset of the CRTC scanout area on the underlying framebuffer
 975  * @y: y offset of the CRTC scanout area on the underlying framebuffer
 976  * @old_fb: previous framebuffer
 977  *
 978  * This function implements a callback useable as the ->mode_set_base used
 979  * required by the crtc helpers. The driver must provide the atomic plane helper
 980  * functions for the primary plane.
 981  *
 982  * This is a transitional helper useful for converting drivers to the atomic
 983  * interfaces.
 984  */
 985 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 986                                   struct drm_framebuffer *old_fb)
 987 {
 988         struct drm_plane_state *plane_state;
 989         struct drm_plane *plane = crtc->primary;
 990
 991         if (plane->funcs->atomic_duplicate_state)
 992                 plane_state = plane->funcs->atomic_duplicate_state(plane);
 993         else if (plane->state)
 994                 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
 995         else
 996                 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL);
 997         if (!plane_state)
 998                 return -ENOMEM;
 999         plane_state->plane = plane;
1000
1001         plane_state->crtc = crtc;
1002         drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb);
1003         plane_state->crtc_x = 0;
1004         plane_state->crtc_y = 0;
1005         plane_state->crtc_h = crtc->mode.vdisplay;
1006         plane_state->crtc_w = crtc->mode.hdisplay;
1007         plane_state->src_x = x << 16;
1008         plane_state->src_y = y << 16;
1009         plane_state->src_h = crtc->mode.vdisplay << 16;
1010         plane_state->src_w = crtc->mode.hdisplay << 16;
1011
1012         return drm_plane_helper_commit(plane, plane_state, old_fb);
1013 }
1014 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base);