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_crtc.h>
  38 #include <drm/drm_fourcc.h>
  39 #include <drm/drm_crtc_helper.h>
  40 #include <drm/drm_fb_helper.h>
  41 #include <drm/drm_plane_helper.h>
  42 #include <drm/drm_edid.h>
  43
  44 /**
  45  * DOC: overview
  46  *
  47  * The CRTC modeset helper library provides a default set_config implementation
  48  * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
  49  * the same callbacks which drivers can use to e.g. restore the modeset
  50  * configuration on resume with drm_helper_resume_force_mode().
  51  *
  52  * The driver callbacks are mostly compatible with the atomic modeset helpers,
  53  * except for the handling of the primary plane: Atomic helpers require that the
  54  * primary plane is implemented as a real standalone plane and not directly tied
  55  * to the CRTC state. For easier transition this library provides functions to
  56  * implement the old semantics required by the CRTC helpers using the new plane
  57  * and atomic helper callbacks.
  58  *
  59  * Drivers are strongly urged to convert to the atomic helpers (by way of first
  60  * converting to the plane helpers). New drivers must not use these functions
  61  * but need to implement the atomic interface instead, potentially using the
  62  * atomic helpers for that.
  63  */
  64 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  65 MODULE_DESCRIPTION("DRM KMS helper");
  66 MODULE_LICENSE("GPL and additional rights");
  67
  68 /**
  69  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  70  *                                              connector list
  71  * @dev: drm device to operate on
  72  *
  73  * Some userspace presumes that the first connected connector is the main
  74  * display, where it's supposed to display e.g. the login screen. For
  75  * laptops, this should be the main panel. Use this function to sort all
  76  * (eDP/LVDS) panels to the front of the connector list, instead of
  77  * painstakingly trying to initialize them in the right order.
  78  */
  79 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  80 {
  81         struct drm_connector *connector, *tmp;
  82         struct list_head panel_list;
  83
  84         INIT_LIST_HEAD(&panel_list);
  85
  86         list_for_each_entry_safe(connector, tmp,
  87                                  &dev->mode_config.connector_list, head) {
  88                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  89                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  90                         list_move_tail(&connector->head, &panel_list);
  91         }
  92
  93         list_splice(&panel_list, &dev->mode_config.connector_list);
  94 }
  95 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  96
  97 /**
  98  * drm_helper_encoder_in_use - check if a given encoder is in use
  99  * @encoder: encoder to check
 100  *
 101  * Checks whether @encoder is with the current mode setting output configuration
 102  * in use by any connector. This doesn't mean that it is actually enabled since
 103  * the DPMS state is tracked separately.
 104  *
 105  * Returns:
 106  * True if @encoder is used, false otherwise.
 107  */
 108 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 109 {
 110         struct drm_connector *connector;
 111         struct drm_device *dev = encoder->dev;
 112
 113         /*
 114          * We can expect this mutex to be locked if we are not panicking.
 115          * Locking is currently fubar in the panic handler.
 116          */
 117         if (!oops_in_progress) {
 118                 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 119                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 120         }
 121
 122         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 123                 if (connector->encoder == encoder)
 124                         return true;
 125         return false;
 126 }
 127 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 128
 129 /**
 130  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 131  * @crtc: CRTC to check
 132  *
 133  * Checks whether @crtc is with the current mode setting output configuration
 134  * in use by any connector. This doesn't mean that it is actually enabled since
 135  * the DPMS state is tracked separately.
 136  *
 137  * Returns:
 138  * True if @crtc is used, false otherwise.
 139  */
 140 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 141 {
 142         struct drm_encoder *encoder;
 143         struct drm_device *dev = crtc->dev;
 144
 145         /*
 146          * We can expect this mutex to be locked if we are not panicking.
 147          * Locking is currently fubar in the panic handler.
 148          */
 149         if (!oops_in_progress)
 150                 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 151
 152         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 153                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 154                         return true;
 155         return false;
 156 }
 157 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 158
 159 static void
 160 drm_encoder_disable(struct drm_encoder *encoder)
 161 {
 162         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 163
 164         if (encoder->bridge)
 165                 encoder->bridge->funcs->disable(encoder->bridge);
 166
 167         if (encoder_funcs->disable)
 168                 (*encoder_funcs->disable)(encoder);
 169         else
 170                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 171
 172         if (encoder->bridge)
 173                 encoder->bridge->funcs->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                 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         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;
 272         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 273         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_x = crtc->x;
 294         saved_y = crtc->y;
 295
 296         /* Update crtc values up front so the driver can rely on them for mode
 297          * setting.
 298          */
 299         crtc->mode = *mode;
 300         crtc->x = x;
 301         crtc->y = y;
 302
 303         /* Pass our mode to the connectors and the CRTC to give them a chance to
 304          * adjust it according to limitations or connector properties, and also
 305          * a chance to reject the mode entirely.
 306          */
 307         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 308
 309                 if (encoder->crtc != crtc)
 310                         continue;
 311
 312                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 313                         ret = encoder->bridge->funcs->mode_fixup(
 314                                         encoder->bridge, mode, adjusted_mode);
 315                         if (!ret) {
 316                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 317                                 goto done;
 318                         }
 319                 }
 320
 321                 encoder_funcs = encoder->helper_private;
 322                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 323                                                       adjusted_mode))) {
 324                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 325                         goto done;
 326                 }
 327         }
 328
 329         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 330                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 331                 goto done;
 332         }
 333         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 334
 335         /* Prepare the encoders and CRTCs before setting the mode. */
 336         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 337
 338                 if (encoder->crtc != crtc)
 339                         continue;
 340
 341                 if (encoder->bridge)
 342                         encoder->bridge->funcs->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                 if (encoder->bridge)
 349                         encoder->bridge->funcs->post_disable(encoder->bridge);
 350         }
 351
 352         drm_crtc_prepare_encoders(dev);
 353
 354         crtc_funcs->prepare(crtc);
 355
 356         /* Set up the DPLL and any encoders state that needs to adjust or depend
 357          * on the DPLL.
 358          */
 359         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 360         if (!ret)
 361             goto done;
 362
 363         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 364
 365                 if (encoder->crtc != crtc)
 366                         continue;
 367
 368                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 369                         encoder->base.id, encoder->name,
 370                         mode->base.id, mode->name);
 371                 encoder_funcs = encoder->helper_private;
 372                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 373
 374                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 375                         encoder->bridge->funcs->mode_set(encoder->bridge, mode,
 376                                         adjusted_mode);
 377         }
 378
 379         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 380         crtc_funcs->commit(crtc);
 381
 382         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 383
 384                 if (encoder->crtc != crtc)
 385                         continue;
 386
 387                 if (encoder->bridge)
 388                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 389
 390                 encoder_funcs = encoder->helper_private;
 391                 encoder_funcs->commit(encoder);
 392
 393                 if (encoder->bridge)
 394                         encoder->bridge->funcs->enable(encoder->bridge);
 395         }
 396
 397         /* Store real post-adjustment hardware mode. */
 398         crtc->hwmode = *adjusted_mode;
 399
 400         /* Calculate and store various constants which
 401          * are later needed by vblank and swap-completion
 402          * timestamping. They are derived from true hwmode.
 403          */
 404         drm_calc_timestamping_constants(crtc, &crtc->hwmode);
 405
 406         /* FIXME: add subpixel order */
 407 done:
 408         drm_mode_destroy(dev, adjusted_mode);
 409         if (!ret) {
 410                 crtc->enabled = saved_enabled;
 411                 crtc->mode = saved_mode;
 412                 crtc->x = saved_x;
 413                 crtc->y = saved_y;
 414         }
 415
 416         return ret;
 417 }
 418 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 419
 420 static void
 421 drm_crtc_helper_disable(struct drm_crtc *crtc)
 422 {
 423         struct drm_device *dev = crtc->dev;
 424         struct drm_connector *connector;
 425         struct drm_encoder *encoder;
 426
 427         /* Decouple all encoders and their attached connectors from this crtc */
 428         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 429                 if (encoder->crtc != crtc)
 430                         continue;
 431
 432                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 433                         if (connector->encoder != encoder)
 434                                 continue;
 435
 436                         connector->encoder = NULL;
 437
 438                         /*
 439                          * drm_helper_disable_unused_functions() ought to be
 440                          * doing this, but since we've decoupled the encoder
 441                          * from the connector above, the required connection
 442                          * between them is henceforth no longer available.
 443                          */
 444                         connector->dpms = DRM_MODE_DPMS_OFF;
 445                 }
 446         }
 447
 448         __drm_helper_disable_unused_functions(dev);
 449 }
 450
 451 /**
 452  * drm_crtc_helper_set_config - set a new config from userspace
 453  * @set: mode set configuration
 454  *
 455  * Setup a new configuration, provided by the upper layers (either an ioctl call
 456  * from userspace or internally e.g. from the fbdev support code) in @set, and
 457  * enable it. This is the main helper functions for drivers that implement
 458  * kernel mode setting with the crtc helper functions and the assorted
 459  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 460  *
 461  * Returns:
 462  * Returns 0 on success, negative errno numbers on failure.
 463  */
 464 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 465 {
 466         struct drm_device *dev;
 467         struct drm_crtc *new_crtc;
 468         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 469         bool mode_changed = false; /* if true do a full mode set */
 470         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 471         struct drm_connector *save_connectors, *connector;
 472         int count = 0, ro, fail = 0;
 473         struct drm_crtc_helper_funcs *crtc_funcs;
 474         struct drm_mode_set save_set;
 475         int ret;
 476         int i;
 477
 478         DRM_DEBUG_KMS("\n");
 479
 480         BUG_ON(!set);
 481         BUG_ON(!set->crtc);
 482         BUG_ON(!set->crtc->helper_private);
 483
 484         /* Enforce sane interface api - has been abused by the fb helper. */
 485         BUG_ON(!set->mode && set->fb);
 486         BUG_ON(set->fb && set->num_connectors == 0);
 487
 488         crtc_funcs = set->crtc->helper_private;
 489
 490         if (!set->mode)
 491                 set->fb = NULL;
 492
 493         if (set->fb) {
 494                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 495                                 set->crtc->base.id, set->fb->base.id,
 496                                 (int)set->num_connectors, set->x, set->y);
 497         } else {
 498                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 499                 drm_crtc_helper_disable(set->crtc);
 500                 return 0;
 501         }
 502
 503         dev = set->crtc->dev;
 504
 505         drm_warn_on_modeset_not_all_locked(dev);
 506
 507         /*
 508          * Allocate space for the backup of all (non-pointer) encoder and
 509          * connector data.
 510          */
 511         save_encoders = kzalloc(dev->mode_config.num_encoder *
 512                                 sizeof(struct drm_encoder), GFP_KERNEL);
 513         if (!save_encoders)
 514                 return -ENOMEM;
 515
 516         save_connectors = kzalloc(dev->mode_config.num_connector *
 517                                 sizeof(struct drm_connector), GFP_KERNEL);
 518         if (!save_connectors) {
 519                 kfree(save_encoders);
 520                 return -ENOMEM;
 521         }
 522
 523         /*
 524          * Copy data. Note that driver private data is not affected.
 525          * Should anything bad happen only the expected state is
 526          * restored, not the drivers personal bookkeeping.
 527          */
 528         count = 0;
 529         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 530                 save_encoders[count++] = *encoder;
 531         }
 532
 533         count = 0;
 534         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 535                 save_connectors[count++] = *connector;
 536         }
 537
 538         save_set.crtc = set->crtc;
 539         save_set.mode = &set->crtc->mode;
 540         save_set.x = set->crtc->x;
 541         save_set.y = set->crtc->y;
 542         save_set.fb = set->crtc->primary->fb;
 543
 544         /* We should be able to check here if the fb has the same properties
 545          * and then just flip_or_move it */
 546         if (set->crtc->primary->fb != set->fb) {
 547                 /* If we have no fb then treat it as a full mode set */
 548                 if (set->crtc->primary->fb == NULL) {
 549                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 550                         mode_changed = true;
 551                 } else if (set->fb == NULL) {
 552                         mode_changed = true;
 553                 } else if (set->fb->pixel_format !=
 554                            set->crtc->primary->fb->pixel_format) {
 555                         mode_changed = true;
 556                 } else
 557                         fb_changed = true;
 558         }
 559
 560         if (set->x != set->crtc->x || set->y != set->crtc->y)
 561                 fb_changed = true;
 562
 563         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 564                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 565                 drm_mode_debug_printmodeline(&set->crtc->mode);
 566                 drm_mode_debug_printmodeline(set->mode);
 567                 mode_changed = true;
 568         }
 569
 570         /* a) traverse passed in connector list and get encoders for them */
 571         count = 0;
 572         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 573                 struct drm_connector_helper_funcs *connector_funcs =
 574                         connector->helper_private;
 575                 new_encoder = connector->encoder;
 576                 for (ro = 0; ro < set->num_connectors; ro++) {
 577                         if (set->connectors[ro] == connector) {
 578                                 new_encoder = connector_funcs->best_encoder(connector);
 579                                 /* if we can't get an encoder for a connector
 580                                    we are setting now - then fail */
 581                                 if (new_encoder == NULL)
 582                                         /* don't break so fail path works correct */
 583                                         fail = 1;
 584
 585                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 586                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 587                                         mode_changed = true;
 588                                 }
 589
 590                                 break;
 591                         }
 592                 }
 593
 594                 if (new_encoder != connector->encoder) {
 595                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 596                         mode_changed = true;
 597                         /* If the encoder is reused for another connector, then
 598                          * the appropriate crtc will be set later.
 599                          */
 600                         if (connector->encoder)
 601                                 connector->encoder->crtc = NULL;
 602                         connector->encoder = new_encoder;
 603                 }
 604         }
 605
 606         if (fail) {
 607                 ret = -EINVAL;
 608                 goto fail;
 609         }
 610
 611         count = 0;
 612         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 613                 if (!connector->encoder)
 614                         continue;
 615
 616                 if (connector->encoder->crtc == set->crtc)
 617                         new_crtc = NULL;
 618                 else
 619                         new_crtc = connector->encoder->crtc;
 620
 621                 for (ro = 0; ro < set->num_connectors; ro++) {
 622                         if (set->connectors[ro] == connector)
 623                                 new_crtc = set->crtc;
 624                 }
 625
 626                 /* Make sure the new CRTC will work with the encoder */
 627                 if (new_crtc &&
 628                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 629                         ret = -EINVAL;
 630                         goto fail;
 631                 }
 632                 if (new_crtc != connector->encoder->crtc) {
 633                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 634                         mode_changed = true;
 635                         connector->encoder->crtc = new_crtc;
 636                 }
 637                 if (new_crtc) {
 638                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 639                                 connector->base.id, connector->name,
 640                                 new_crtc->base.id);
 641                 } else {
 642                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 643                                 connector->base.id, connector->name);
 644                 }
 645         }
 646
 647         /* mode_set_base is not a required function */
 648         if (fb_changed && !crtc_funcs->mode_set_base)
 649                 mode_changed = true;
 650
 651         if (mode_changed) {
 652                 if (drm_helper_crtc_in_use(set->crtc)) {
 653                         DRM_DEBUG_KMS("attempting to set mode from"
 654                                         " userspace\n");
 655                         drm_mode_debug_printmodeline(set->mode);
 656                         set->crtc->primary->fb = set->fb;
 657                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 658                                                       set->x, set->y,
 659                                                       save_set.fb)) {
 660                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 661                                           set->crtc->base.id);
 662                                 set->crtc->primary->fb = save_set.fb;
 663                                 ret = -EINVAL;
 664                                 goto fail;
 665                         }
 666                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 667                         for (i = 0; i < set->num_connectors; i++) {
 668                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 669                                               set->connectors[i]->name);
 670                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 671                         }
 672                 }
 673                 __drm_helper_disable_unused_functions(dev);
 674         } else if (fb_changed) {
 675                 set->crtc->x = set->x;
 676                 set->crtc->y = set->y;
 677                 set->crtc->primary->fb = set->fb;
 678                 ret = crtc_funcs->mode_set_base(set->crtc,
 679                                                 set->x, set->y, save_set.fb);
 680                 if (ret != 0) {
 681                         set->crtc->x = save_set.x;
 682                         set->crtc->y = save_set.y;
 683                         set->crtc->primary->fb = save_set.fb;
 684                         goto fail;
 685                 }
 686         }
 687
 688         kfree(save_connectors);
 689         kfree(save_encoders);
 690         return 0;
 691
 692 fail:
 693         /* Restore all previous data. */
 694         count = 0;
 695         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 696                 *encoder = save_encoders[count++];
 697         }
 698
 699         count = 0;
 700         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 701                 *connector = save_connectors[count++];
 702         }
 703
 704         /* Try to restore the config */
 705         if (mode_changed &&
 706             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 707                                       save_set.y, save_set.fb))
 708                 DRM_ERROR("failed to restore config after modeset failure\n");
 709
 710         kfree(save_connectors);
 711         kfree(save_encoders);
 712         return ret;
 713 }
 714 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 715
 716 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 717 {
 718         int dpms = DRM_MODE_DPMS_OFF;
 719         struct drm_connector *connector;
 720         struct drm_device *dev = encoder->dev;
 721
 722         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 723                 if (connector->encoder == encoder)
 724                         if (connector->dpms < dpms)
 725                                 dpms = connector->dpms;
 726         return dpms;
 727 }
 728
 729 /* Helper which handles bridge ordering around encoder dpms */
 730 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 731 {
 732         struct drm_bridge *bridge = encoder->bridge;
 733         struct drm_encoder_helper_funcs *encoder_funcs;
 734
 735         if (bridge) {
 736                 if (mode == DRM_MODE_DPMS_ON)
 737                         bridge->funcs->pre_enable(bridge);
 738                 else
 739                         bridge->funcs->disable(bridge);
 740         }
 741
 742         encoder_funcs = encoder->helper_private;
 743         if (encoder_funcs->dpms)
 744                 encoder_funcs->dpms(encoder, mode);
 745
 746         if (bridge) {
 747                 if (mode == DRM_MODE_DPMS_ON)
 748                         bridge->funcs->enable(bridge);
 749                 else
 750                         bridge->funcs->post_disable(bridge);
 751         }
 752 }
 753
 754 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 755 {
 756         int dpms = DRM_MODE_DPMS_OFF;
 757         struct drm_connector *connector;
 758         struct drm_device *dev = crtc->dev;
 759
 760         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 761                 if (connector->encoder && connector->encoder->crtc == crtc)
 762                         if (connector->dpms < dpms)
 763                                 dpms = connector->dpms;
 764         return dpms;
 765 }
 766
 767 /**
 768  * drm_helper_connector_dpms() - connector dpms helper implementation
 769  * @connector: affected connector
 770  * @mode: DPMS mode
 771  *
 772  * This is the main helper function provided by the crtc helper framework for
 773  * implementing the DPMS connector attribute. It computes the new desired DPMS
 774  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 775  * callback provided by the driver appropriately.
 776  */
 777 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 778 {
 779         struct drm_encoder *encoder = connector->encoder;
 780         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 781         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 782
 783         if (mode == connector->dpms)
 784                 return;
 785
 786         old_dpms = connector->dpms;
 787         connector->dpms = mode;
 788
 789         if (encoder)
 790                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 791
 792         /* from off to on, do crtc then encoder */
 793         if (mode < old_dpms) {
 794                 if (crtc) {
 795                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 796                         if (crtc_funcs->dpms)
 797                                 (*crtc_funcs->dpms) (crtc,
 798                                                      drm_helper_choose_crtc_dpms(crtc));
 799                 }
 800                 if (encoder)
 801                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 802         }
 803
 804         /* from on to off, do encoder then crtc */
 805         if (mode > old_dpms) {
 806                 if (encoder)
 807                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 808                 if (crtc) {
 809                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 810                         if (crtc_funcs->dpms)
 811                                 (*crtc_funcs->dpms) (crtc,
 812                                                      drm_helper_choose_crtc_dpms(crtc));
 813                 }
 814         }
 815
 816         return;
 817 }
 818 EXPORT_SYMBOL(drm_helper_connector_dpms);
 819
 820 /**
 821  * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
 822  * @fb: drm_framebuffer object to fill out
 823  * @mode_cmd: metadata from the userspace fb creation request
 824  *
 825  * This helper can be used in a drivers fb_create callback to pre-fill the fb's
 826  * metadata fields.
 827  */
 828 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 829                                     struct drm_mode_fb_cmd2 *mode_cmd)
 830 {
 831         int i;
 832
 833         fb->width = mode_cmd->width;
 834         fb->height = mode_cmd->height;
 835         for (i = 0; i < 4; i++) {
 836                 fb->pitches[i] = mode_cmd->pitches[i];
 837                 fb->offsets[i] = mode_cmd->offsets[i];
 838         }
 839         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 840                                     &fb->bits_per_pixel);
 841         fb->pixel_format = mode_cmd->pixel_format;
 842         fb->flags = mode_cmd->flags;
 843 }
 844 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 845
 846 /**
 847  * drm_helper_resume_force_mode - force-restore mode setting configuration
 848  * @dev: drm_device which should be restored
 849  *
 850  * Drivers which use the mode setting helpers can use this function to
 851  * force-restore the mode setting configuration e.g. on resume or when something
 852  * else might have trampled over the hw state (like some overzealous old BIOSen
 853  * tended to do).
 854  *
 855  * This helper doesn't provide a error return value since restoring the old
 856  * config should never fail due to resource allocation issues since the driver
 857  * has successfully set the restored configuration already. Hence this should
 858  * boil down to the equivalent of a few dpms on calls, which also don't provide
 859  * an error code.
 860  *
 861  * Drivers where simply restoring an old configuration again might fail (e.g.
 862  * due to slight differences in allocating shared resources when the
 863  * configuration is restored in a different order than when userspace set it up)
 864  * need to use their own restore logic.
 865  */
 866 void drm_helper_resume_force_mode(struct drm_device *dev)
 867 {
 868         struct drm_crtc *crtc;
 869         struct drm_encoder *encoder;
 870         struct drm_crtc_helper_funcs *crtc_funcs;
 871         int encoder_dpms;
 872         bool ret;
 873
 874         drm_modeset_lock_all(dev);
 875         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 876
 877                 if (!crtc->enabled)
 878                         continue;
 879
 880                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 881                                                crtc->x, crtc->y, crtc->primary->fb);
 882
 883                 /* Restoring the old config should never fail! */
 884                 if (ret == false)
 885                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 886
 887                 /* Turn off outputs that were already powered off */
 888                 if (drm_helper_choose_crtc_dpms(crtc)) {
 889                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 890
 891                                 if(encoder->crtc != crtc)
 892                                         continue;
 893
 894                                 encoder_dpms = drm_helper_choose_encoder_dpms(
 895                                                         encoder);
 896
 897                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
 898                         }
 899
 900                         crtc_funcs = crtc->helper_private;
 901                         if (crtc_funcs->dpms)
 902                                 (*crtc_funcs->dpms) (crtc,
 903                                                      drm_helper_choose_crtc_dpms(crtc));
 904                 }
 905         }
 906
 907         /* disable the unused connectors while restoring the modesetting */
 908         __drm_helper_disable_unused_functions(dev);
 909         drm_modeset_unlock_all(dev);
 910 }
 911 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 912
 913 /**
 914  * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
 915  * @crtc: DRM CRTC
 916  * @mode: DRM display mode which userspace requested
 917  * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
 918  * @x: x offset of the CRTC scanout area on the underlying framebuffer
 919  * @y: y offset of the CRTC scanout area on the underlying framebuffer
 920  * @old_fb: previous framebuffer
 921  *
 922  * This function implements a callback useable as the ->mode_set callback
 923  * required by the crtc helpers. Besides the atomic plane helper functions for
 924  * the primary plane the driver must also provide the ->mode_set_nofb callback
 925  * to set up the crtc.
 926  *
 927  * This is a transitional helper useful for converting drivers to the atomic
 928  * interfaces.
 929  */
 930 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 931                              struct drm_display_mode *adjusted_mode, int x, int y,
 932                              struct drm_framebuffer *old_fb)
 933 {
 934         struct drm_crtc_state *crtc_state;
 935         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 936         int ret;
 937
 938         if (crtc->funcs->atomic_duplicate_state)
 939                 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
 940         else if (crtc->state)
 941                 crtc_state = kmemdup(crtc->state, sizeof(*crtc_state),
 942                                      GFP_KERNEL);
 943         else
 944                 crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL);
 945         if (!crtc_state)
 946                 return -ENOMEM;
 947
 948         crtc_state->enable = true;
 949         crtc_state->planes_changed = true;
 950         crtc_state->mode_changed = true;
 951         drm_mode_copy(&crtc_state->mode, mode);
 952         drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
 953
 954         if (crtc_funcs->atomic_check) {
 955                 ret = crtc_funcs->atomic_check(crtc, crtc_state);
 956                 if (ret) {
 957                         kfree(crtc_state);
 958
 959                         return ret;
 960                 }
 961         }
 962
 963         swap(crtc->state, crtc_state);
 964
 965         crtc_funcs->mode_set_nofb(crtc);
 966
 967         if (crtc_state) {
 968                 if (crtc->funcs->atomic_destroy_state)
 969                         crtc->funcs->atomic_destroy_state(crtc, crtc_state);
 970                 else
 971                         kfree(crtc_state);
 972         }
 973
 974         return drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
 975 }
 976 EXPORT_SYMBOL(drm_helper_crtc_mode_set);
 977
 978 /**
 979  * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
 980  * @crtc: DRM CRTC
 981  * @x: x offset of the CRTC scanout area on the underlying framebuffer
 982  * @y: y offset of the CRTC scanout area on the underlying framebuffer
 983  * @old_fb: previous framebuffer
 984  *
 985  * This function implements a callback useable as the ->mode_set_base used
 986  * required by the crtc helpers. The driver must provide the atomic plane helper
 987  * functions for the primary plane.
 988  *
 989  * This is a transitional helper useful for converting drivers to the atomic
 990  * interfaces.
 991  */
 992 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 993                                   struct drm_framebuffer *old_fb)
 994 {
 995         struct drm_plane_state *plane_state;
 996         struct drm_plane *plane = crtc->primary;
 997
 998         if (plane->funcs->atomic_duplicate_state)
 999                 plane_state = plane->funcs->atomic_duplicate_state(plane);
1000         else if (plane->state)
1001                 plane_state = kmemdup(plane->state, sizeof(*plane_state),
1002                                       GFP_KERNEL);
1003         else
1004                 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL);
1005         if (!plane_state)
1006                 return -ENOMEM;
1007
1008         plane_state->crtc = crtc;
1009         plane_state->fb = crtc->primary->fb;
1010         plane_state->crtc_x = 0;
1011         plane_state->crtc_y = 0;
1012         plane_state->crtc_h = crtc->mode.vdisplay;
1013         plane_state->crtc_w = crtc->mode.hdisplay;
1014         plane_state->src_x = x << 16;
1015         plane_state->src_y = y << 16;
1016         plane_state->src_h = crtc->mode.vdisplay << 16;
1017         plane_state->src_w = crtc->mode.hdisplay << 16;
1018
1019         return drm_plane_helper_commit(plane, plane_state, old_fb);
1020 }
1021 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base);