sys/dev/drm2/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 <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <dev/drm2/drmP.h>
  36 #include <dev/drm2/drm_crtc.h>
  37 #include <dev/drm2/drm_fourcc.h>
  38 #include <dev/drm2/drm_crtc_helper.h>
  39 #include <dev/drm2/drm_fb_helper.h>
  40 #include <dev/drm2/drm_edid.h>
  41
  42 /**
  43  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  44  *                                              connector list
  45  * @dev: drm device to operate on
  46  *
  47  * Some userspace presumes that the first connected connector is the main
  48  * display, where it's supposed to display e.g. the login screen. For
  49  * laptops, this should be the main panel. Use this function to sort all
  50  * (eDP/LVDS) panels to the front of the connector list, instead of
  51  * painstakingly trying to initialize them in the right order.
  52  */
  53 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  54 {
  55         struct drm_connector *connector, *tmp;
  56         struct list_head panel_list;
  57
  58         INIT_LIST_HEAD(&panel_list);
  59
  60         list_for_each_entry_safe(connector, tmp,
  61                                  &dev->mode_config.connector_list, head) {
  62                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  63                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  64                         list_move_tail(&connector->head, &panel_list);
  65         }
  66
  67         list_splice(&panel_list, &dev->mode_config.connector_list);
  68 }
  69 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  70
  71 static bool drm_kms_helper_poll = true;
  72 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  73
  74 static void drm_mode_validate_flag(struct drm_connector *connector,
  75                                    int flags)
  76 {
  77         struct drm_display_mode *mode;
  78
  79         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  80                 return;
  81
  82         list_for_each_entry(mode, &connector->modes, head) {
  83                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  84                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  85                         mode->status = MODE_NO_INTERLACE;
  86                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  87                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  88                         mode->status = MODE_NO_DBLESCAN;
  89         }
  90
  91         return;
  92 }
  93
  94 /**
  95  * drm_helper_probe_single_connector_modes - get complete set of display modes
  96  * @connector: connector to probe
  97  * @maxX: max width for modes
  98  * @maxY: max height for modes
  99  *
 100  * LOCKING:
 101  * Caller must hold mode config lock.
 102  *
 103  * Based on the helper callbacks implemented by @connector try to detect all
 104  * valid modes.  Modes will first be added to the connector's probed_modes list,
 105  * then culled (based on validity and the @maxX, @maxY parameters) and put into
 106  * the normal modes list.
 107  *
 108  * Intended to be use as a generic implementation of the ->probe() @connector
 109  * callback for drivers that use the crtc helpers for output mode filtering and
 110  * detection.
 111  *
 112  * RETURNS:
 113  * Number of modes found on @connector.
 114  */
 115 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 116                                             uint32_t maxX, uint32_t maxY)
 117 {
 118         struct drm_device *dev = connector->dev;
 119         struct drm_display_mode *mode;
 120         struct drm_connector_helper_funcs *connector_funcs =
 121                 connector->helper_private;
 122         int count = 0;
 123         int mode_flags = 0;
 124
 125         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 126                         drm_get_connector_name(connector));
 127         /* set all modes to the unverified state */
 128         list_for_each_entry(mode, &connector->modes, head)
 129                 mode->status = MODE_UNVERIFIED;
 130
 131         if (connector->force) {
 132                 if (connector->force == DRM_FORCE_ON)
 133                         connector->status = connector_status_connected;
 134                 else
 135                         connector->status = connector_status_disconnected;
 136                 if (connector->funcs->force)
 137                         connector->funcs->force(connector);
 138         } else {
 139                 connector->status = connector->funcs->detect(connector, true);
 140         }
 141
 142         /* Re-enable polling in case the global poll config changed. */
 143         if (drm_kms_helper_poll != dev->mode_config.poll_running)
 144                 drm_kms_helper_poll_enable(dev);
 145
 146         dev->mode_config.poll_running = drm_kms_helper_poll;
 147
 148         if (connector->status == connector_status_disconnected) {
 149                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 150                         connector->base.id, drm_get_connector_name(connector));
 151                 drm_mode_connector_update_edid_property(connector, NULL);
 152                 goto prune;
 153         }
 154
 155 #ifdef FREEBSD_NOTYET
 156 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 157         count = drm_load_edid_firmware(connector);
 158         if (count == 0)
 159 #endif
 160 #endif /* FREEBSD_NOTYET */
 161                 count = (*connector_funcs->get_modes)(connector);
 162
 163         if (count == 0 && connector->status == connector_status_connected)
 164                 count = drm_add_modes_noedid(connector, 1024, 768);
 165         if (count == 0)
 166                 goto prune;
 167
 168         drm_mode_connector_list_update(connector);
 169
 170         if (maxX && maxY)
 171                 drm_mode_validate_size(dev, &connector->modes, maxX,
 172                                        maxY, 0);
 173
 174         if (connector->interlace_allowed)
 175                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 176         if (connector->doublescan_allowed)
 177                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 178         drm_mode_validate_flag(connector, mode_flags);
 179
 180         list_for_each_entry(mode, &connector->modes, head) {
 181                 if (mode->status == MODE_OK)
 182                         mode->status = connector_funcs->mode_valid(connector,
 183                                                                    mode);
 184         }
 185
 186 prune:
 187         drm_mode_prune_invalid(dev, &connector->modes, true);
 188
 189         if (list_empty(&connector->modes))
 190                 return 0;
 191
 192         list_for_each_entry(mode, &connector->modes, head)
 193                 mode->vrefresh = drm_mode_vrefresh(mode);
 194
 195         drm_mode_sort(&connector->modes);
 196
 197         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 198                         drm_get_connector_name(connector));
 199         list_for_each_entry(mode, &connector->modes, head) {
 200                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 201                 drm_mode_debug_printmodeline(mode);
 202         }
 203
 204         return count;
 205 }
 206 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 207
 208 /**
 209  * drm_helper_encoder_in_use - check if a given encoder is in use
 210  * @encoder: encoder to check
 211  *
 212  * LOCKING:
 213  * Caller must hold mode config lock.
 214  *
 215  * Walk @encoders's DRM device's mode_config and see if it's in use.
 216  *
 217  * RETURNS:
 218  * True if @encoder is part of the mode_config, false otherwise.
 219  */
 220 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 221 {
 222         struct drm_connector *connector;
 223         struct drm_device *dev = encoder->dev;
 224         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 225                 if (connector->encoder == encoder)
 226                         return true;
 227         return false;
 228 }
 229 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 230
 231 /**
 232  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 233  * @crtc: CRTC to check
 234  *
 235  * LOCKING:
 236  * Caller must hold mode config lock.
 237  *
 238  * Walk @crtc's DRM device's mode_config and see if it's in use.
 239  *
 240  * RETURNS:
 241  * True if @crtc is part of the mode_config, false otherwise.
 242  */
 243 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 244 {
 245         struct drm_encoder *encoder;
 246         struct drm_device *dev = crtc->dev;
 247         /* FIXME: Locking around list access? */
 248         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 249                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 250                         return true;
 251         return false;
 252 }
 253 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 254
 255 static void
 256 drm_encoder_disable(struct drm_encoder *encoder)
 257 {
 258         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 259
 260         if (encoder_funcs->disable)
 261                 (*encoder_funcs->disable)(encoder);
 262         else
 263                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 264 }
 265
 266 /**
 267  * drm_helper_disable_unused_functions - disable unused objects
 268  * @dev: DRM device
 269  *
 270  * LOCKING:
 271  * Caller must hold mode config lock.
 272  *
 273  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 274  * by calling its dpms function, which should power it off.
 275  */
 276 void drm_helper_disable_unused_functions(struct drm_device *dev)
 277 {
 278         struct drm_encoder *encoder;
 279         struct drm_connector *connector;
 280         struct drm_crtc *crtc;
 281
 282         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 283                 if (!connector->encoder)
 284                         continue;
 285                 if (connector->status == connector_status_disconnected)
 286                         connector->encoder = NULL;
 287         }
 288
 289         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 290                 if (!drm_helper_encoder_in_use(encoder)) {
 291                         drm_encoder_disable(encoder);
 292                         /* disconnector encoder from any connector */
 293                         encoder->crtc = NULL;
 294                 }
 295         }
 296
 297         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 298                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 299                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 300                 if (!crtc->enabled) {
 301                         if (crtc_funcs->disable)
 302                                 (*crtc_funcs->disable)(crtc);
 303                         else
 304                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 305                         crtc->fb = NULL;
 306                 }
 307         }
 308 }
 309 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 310
 311 /**
 312  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 313  * @encoder: encoder to test
 314  * @crtc: crtc to test
 315  *
 316  * Return false if @encoder can't be driven by @crtc, true otherwise.
 317  */
 318 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 319                                 struct drm_crtc *crtc)
 320 {
 321         struct drm_device *dev;
 322         struct drm_crtc *tmp;
 323         int crtc_mask = 1;
 324
 325         if (crtc == NULL)
 326                 printf("checking null crtc?\n");
 327
 328         dev = crtc->dev;
 329
 330         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 331                 if (tmp == crtc)
 332                         break;
 333                 crtc_mask <<= 1;
 334         }
 335
 336         if (encoder->possible_crtcs & crtc_mask)
 337                 return true;
 338         return false;
 339 }
 340
 341 /*
 342  * Check the CRTC we're going to map each output to vs. its current
 343  * CRTC.  If they don't match, we have to disable the output and the CRTC
 344  * since the driver will have to re-route things.
 345  */
 346 static void
 347 drm_crtc_prepare_encoders(struct drm_device *dev)
 348 {
 349         struct drm_encoder_helper_funcs *encoder_funcs;
 350         struct drm_encoder *encoder;
 351
 352         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 353                 encoder_funcs = encoder->helper_private;
 354                 /* Disable unused encoders */
 355                 if (encoder->crtc == NULL)
 356                         drm_encoder_disable(encoder);
 357                 /* Disable encoders whose CRTC is about to change */
 358                 if (encoder_funcs->get_crtc &&
 359                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 360                         drm_encoder_disable(encoder);
 361         }
 362 }
 363
 364 /**
 365  * drm_crtc_helper_set_mode - internal helper to set a mode
 366  * @crtc: CRTC to program
 367  * @mode: mode to use
 368  * @x: horizontal offset into the surface
 369  * @y: vertical offset into the surface
 370  * @old_fb: old framebuffer, for cleanup
 371  *
 372  * LOCKING:
 373  * Caller must hold mode config lock.
 374  *
 375  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 376  * to fixup or reject the mode prior to trying to set it. This is an internal
 377  * helper that drivers could e.g. use to update properties that require the
 378  * entire output pipe to be disabled and re-enabled in a new configuration. For
 379  * example for changing whether audio is enabled on a hdmi link or for changing
 380  * panel fitter or dither attributes. It is also called by the
 381  * drm_crtc_helper_set_config() helper function to drive the mode setting
 382  * sequence.
 383  *
 384  * RETURNS:
 385  * True if the mode was set successfully, or false otherwise.
 386  */
 387 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 388                               struct drm_display_mode *mode,
 389                               int x, int y,
 390                               struct drm_framebuffer *old_fb)
 391 {
 392         struct drm_device *dev = crtc->dev;
 393         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 394         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 395         struct drm_encoder_helper_funcs *encoder_funcs;
 396         int saved_x, saved_y;
 397         struct drm_encoder *encoder;
 398         bool ret = true;
 399
 400         crtc->enabled = drm_helper_crtc_in_use(crtc);
 401         if (!crtc->enabled)
 402                 return true;
 403
 404         adjusted_mode = drm_mode_duplicate(dev, mode);
 405         if (!adjusted_mode)
 406                 return false;
 407
 408         saved_hwmode = crtc->hwmode;
 409         saved_mode = crtc->mode;
 410         saved_x = crtc->x;
 411         saved_y = crtc->y;
 412
 413         /* Update crtc values up front so the driver can rely on them for mode
 414          * setting.
 415          */
 416         crtc->mode = *mode;
 417         crtc->x = x;
 418         crtc->y = y;
 419
 420         /* Pass our mode to the connectors and the CRTC to give them a chance to
 421          * adjust it according to limitations or connector properties, and also
 422          * a chance to reject the mode entirely.
 423          */
 424         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 425
 426                 if (encoder->crtc != crtc)
 427                         continue;
 428                 encoder_funcs = encoder->helper_private;
 429                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 430                                                       adjusted_mode))) {
 431                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 432                         goto done;
 433                 }
 434         }
 435
 436         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 437                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 438                 goto done;
 439         }
 440         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 441
 442         /* Prepare the encoders and CRTCs before setting the mode. */
 443         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 444
 445                 if (encoder->crtc != crtc)
 446                         continue;
 447                 encoder_funcs = encoder->helper_private;
 448                 /* Disable the encoders as the first thing we do. */
 449                 encoder_funcs->prepare(encoder);
 450         }
 451
 452         drm_crtc_prepare_encoders(dev);
 453
 454         crtc_funcs->prepare(crtc);
 455
 456         /* Set up the DPLL and any encoders state that needs to adjust or depend
 457          * on the DPLL.
 458          */
 459         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 460         if (!ret)
 461             goto done;
 462
 463         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 464
 465                 if (encoder->crtc != crtc)
 466                         continue;
 467
 468                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 469                         encoder->base.id, drm_get_encoder_name(encoder),
 470                         mode->base.id, mode->name);
 471                 encoder_funcs = encoder->helper_private;
 472                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 473         }
 474
 475         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 476         crtc_funcs->commit(crtc);
 477
 478         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 479
 480                 if (encoder->crtc != crtc)
 481                         continue;
 482
 483                 encoder_funcs = encoder->helper_private;
 484                 encoder_funcs->commit(encoder);
 485
 486         }
 487
 488         /* Store real post-adjustment hardware mode. */
 489         crtc->hwmode = *adjusted_mode;
 490
 491         /* Calculate and store various constants which
 492          * are later needed by vblank and swap-completion
 493          * timestamping. They are derived from true hwmode.
 494          */
 495         drm_calc_timestamping_constants(crtc);
 496
 497         /* FIXME: add subpixel order */
 498 done:
 499         drm_mode_destroy(dev, adjusted_mode);
 500         if (!ret) {
 501                 crtc->hwmode = saved_hwmode;
 502                 crtc->mode = saved_mode;
 503                 crtc->x = saved_x;
 504                 crtc->y = saved_y;
 505         }
 506
 507         return ret;
 508 }
 509 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 510
 511
 512 static int
 513 drm_crtc_helper_disable(struct drm_crtc *crtc)
 514 {
 515         struct drm_device *dev = crtc->dev;
 516         struct drm_connector *connector;
 517         struct drm_encoder *encoder;
 518
 519         /* Decouple all encoders and their attached connectors from this crtc */
 520         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 521                 if (encoder->crtc != crtc)
 522                         continue;
 523
 524                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 525                         if (connector->encoder != encoder)
 526                                 continue;
 527
 528                         connector->encoder = NULL;
 529                 }
 530         }
 531
 532         drm_helper_disable_unused_functions(dev);
 533         return 0;
 534 }
 535
 536 /**
 537  * drm_crtc_helper_set_config - set a new config from userspace
 538  * @set: mode set configuration
 539  *
 540  * LOCKING:
 541  * Caller must hold mode config lock.
 542  *
 543  * Setup a new configuration, provided by the upper layers (either an ioctl call
 544  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 545  * enable it. This is the main helper functions for drivers that implement
 546  * kernel mode setting with the crtc helper functions and the assorted
 547  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 548  *
 549  * RETURNS:
 550  * Returns 0 on success, -ERRNO on failure.
 551  */
 552 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 553 {
 554         struct drm_device *dev;
 555         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 556         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 557         struct drm_framebuffer *old_fb = NULL;
 558         bool mode_changed = false; /* if true do a full mode set */
 559         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 560         struct drm_connector *save_connectors, *connector;
 561         int count = 0, ro, fail = 0;
 562         struct drm_crtc_helper_funcs *crtc_funcs;
 563         struct drm_mode_set save_set;
 564         int ret;
 565         int i;
 566
 567         DRM_DEBUG_KMS("\n");
 568
 569         if (!set)
 570                 return -EINVAL;
 571
 572         if (!set->crtc)
 573                 return -EINVAL;
 574
 575         if (!set->crtc->helper_private)
 576                 return -EINVAL;
 577
 578         crtc_funcs = set->crtc->helper_private;
 579
 580         if (!set->mode)
 581                 set->fb = NULL;
 582
 583         if (set->fb) {
 584                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 585                                 set->crtc->base.id, set->fb->base.id,
 586                                 (int)set->num_connectors, set->x, set->y);
 587         } else {
 588                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 589                 return drm_crtc_helper_disable(set->crtc);
 590         }
 591
 592         dev = set->crtc->dev;
 593
 594         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 595          * connector data. */
 596         save_crtcs = malloc(dev->mode_config.num_crtc *
 597                              sizeof(struct drm_crtc), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 598         if (!save_crtcs)
 599                 return -ENOMEM;
 600
 601         save_encoders = malloc(dev->mode_config.num_encoder *
 602                                 sizeof(struct drm_encoder), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 603         if (!save_encoders) {
 604                 free(save_crtcs, DRM_MEM_KMS);
 605                 return -ENOMEM;
 606         }
 607
 608         save_connectors = malloc(dev->mode_config.num_connector *
 609                                 sizeof(struct drm_connector), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 610         if (!save_connectors) {
 611                 free(save_crtcs, DRM_MEM_KMS);
 612                 free(save_encoders, DRM_MEM_KMS);
 613                 return -ENOMEM;
 614         }
 615
 616         /* Copy data. Note that driver private data is not affected.
 617          * Should anything bad happen only the expected state is
 618          * restored, not the drivers personal bookkeeping.
 619          */
 620         count = 0;
 621         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 622                 save_crtcs[count++] = *crtc;
 623         }
 624
 625         count = 0;
 626         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 627                 save_encoders[count++] = *encoder;
 628         }
 629
 630         count = 0;
 631         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 632                 save_connectors[count++] = *connector;
 633         }
 634
 635         save_set.crtc = set->crtc;
 636         save_set.mode = &set->crtc->mode;
 637         save_set.x = set->crtc->x;
 638         save_set.y = set->crtc->y;
 639         save_set.fb = set->crtc->fb;
 640
 641         /* We should be able to check here if the fb has the same properties
 642          * and then just flip_or_move it */
 643         if (set->crtc->fb != set->fb) {
 644                 /* If we have no fb then treat it as a full mode set */
 645                 if (set->crtc->fb == NULL) {
 646                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 647                         mode_changed = true;
 648                 } else if (set->fb == NULL) {
 649                         mode_changed = true;
 650                 } else if (set->fb->depth != set->crtc->fb->depth) {
 651                         mode_changed = true;
 652                 } else if (set->fb->bits_per_pixel !=
 653                            set->crtc->fb->bits_per_pixel) {
 654                         mode_changed = true;
 655                 } else
 656                         fb_changed = true;
 657         }
 658
 659         if (set->x != set->crtc->x || set->y != set->crtc->y)
 660                 fb_changed = true;
 661
 662         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 663                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 664                 drm_mode_debug_printmodeline(&set->crtc->mode);
 665                 drm_mode_debug_printmodeline(set->mode);
 666                 mode_changed = true;
 667         }
 668
 669         /* a) traverse passed in connector list and get encoders for them */
 670         count = 0;
 671         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 672                 struct drm_connector_helper_funcs *connector_funcs =
 673                         connector->helper_private;
 674                 new_encoder = connector->encoder;
 675                 for (ro = 0; ro < set->num_connectors; ro++) {
 676                         if (set->connectors[ro] == connector) {
 677                                 new_encoder = connector_funcs->best_encoder(connector);
 678                                 /* if we can't get an encoder for a connector
 679                                    we are setting now - then fail */
 680                                 if (new_encoder == NULL)
 681                                         /* don't break so fail path works correct */
 682                                         fail = 1;
 683                                 break;
 684                         }
 685                 }
 686
 687                 if (new_encoder != connector->encoder) {
 688                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 689                         mode_changed = true;
 690                         /* If the encoder is reused for another connector, then
 691                          * the appropriate crtc will be set later.
 692                          */
 693                         if (connector->encoder)
 694                                 connector->encoder->crtc = NULL;
 695                         connector->encoder = new_encoder;
 696                 }
 697         }
 698
 699         if (fail) {
 700                 ret = -EINVAL;
 701                 goto fail;
 702         }
 703
 704         count = 0;
 705         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 706                 if (!connector->encoder)
 707                         continue;
 708
 709                 if (connector->encoder->crtc == set->crtc)
 710                         new_crtc = NULL;
 711                 else
 712                         new_crtc = connector->encoder->crtc;
 713
 714                 for (ro = 0; ro < set->num_connectors; ro++) {
 715                         if (set->connectors[ro] == connector)
 716                                 new_crtc = set->crtc;
 717                 }
 718
 719                 /* Make sure the new CRTC will work with the encoder */
 720                 if (new_crtc &&
 721                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 722                         ret = -EINVAL;
 723                         goto fail;
 724                 }
 725                 if (new_crtc != connector->encoder->crtc) {
 726                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 727                         mode_changed = true;
 728                         connector->encoder->crtc = new_crtc;
 729                 }
 730                 if (new_crtc) {
 731                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 732                                 connector->base.id, drm_get_connector_name(connector),
 733                                 new_crtc->base.id);
 734                 } else {
 735                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 736                                 connector->base.id, drm_get_connector_name(connector));
 737                 }
 738         }
 739
 740         /* mode_set_base is not a required function */
 741         if (fb_changed && !crtc_funcs->mode_set_base)
 742                 mode_changed = true;
 743
 744         if (mode_changed) {
 745                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 746                 if (set->crtc->enabled) {
 747                         DRM_DEBUG_KMS("attempting to set mode from"
 748                                         " userspace\n");
 749                         drm_mode_debug_printmodeline(set->mode);
 750                         old_fb = set->crtc->fb;
 751                         set->crtc->fb = set->fb;
 752                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 753                                                       set->x, set->y,
 754                                                       old_fb)) {
 755                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 756                                           set->crtc->base.id);
 757                                 set->crtc->fb = old_fb;
 758                                 ret = -EINVAL;
 759                                 goto fail;
 760                         }
 761                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 762                         for (i = 0; i < set->num_connectors; i++) {
 763                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 764                                               drm_get_connector_name(set->connectors[i]));
 765                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 766                         }
 767                 }
 768                 drm_helper_disable_unused_functions(dev);
 769         } else if (fb_changed) {
 770                 set->crtc->x = set->x;
 771                 set->crtc->y = set->y;
 772
 773                 old_fb = set->crtc->fb;
 774                 if (set->crtc->fb != set->fb)
 775                         set->crtc->fb = set->fb;
 776                 ret = crtc_funcs->mode_set_base(set->crtc,
 777                                                 set->x, set->y, old_fb);
 778                 if (ret != 0) {
 779                         set->crtc->fb = old_fb;
 780                         goto fail;
 781                 }
 782         }
 783
 784         free(save_connectors, DRM_MEM_KMS);
 785         free(save_encoders, DRM_MEM_KMS);
 786         free(save_crtcs, DRM_MEM_KMS);
 787         return 0;
 788
 789 fail:
 790         /* Restore all previous data. */
 791         count = 0;
 792         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 793                 *crtc = save_crtcs[count++];
 794         }
 795
 796         count = 0;
 797         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 798                 *encoder = save_encoders[count++];
 799         }
 800
 801         count = 0;
 802         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 803                 *connector = save_connectors[count++];
 804         }
 805
 806         /* Try to restore the config */
 807         if (mode_changed &&
 808             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 809                                       save_set.y, save_set.fb))
 810                 DRM_ERROR("failed to restore config after modeset failure\n");
 811
 812         free(save_connectors, DRM_MEM_KMS);
 813         free(save_encoders, DRM_MEM_KMS);
 814         free(save_crtcs, DRM_MEM_KMS);
 815         return ret;
 816 }
 817 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 818
 819 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 820 {
 821         int dpms = DRM_MODE_DPMS_OFF;
 822         struct drm_connector *connector;
 823         struct drm_device *dev = encoder->dev;
 824
 825         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 826                 if (connector->encoder == encoder)
 827                         if (connector->dpms < dpms)
 828                                 dpms = connector->dpms;
 829         return dpms;
 830 }
 831
 832 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 833 {
 834         int dpms = DRM_MODE_DPMS_OFF;
 835         struct drm_connector *connector;
 836         struct drm_device *dev = crtc->dev;
 837
 838         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 839                 if (connector->encoder && connector->encoder->crtc == crtc)
 840                         if (connector->dpms < dpms)
 841                                 dpms = connector->dpms;
 842         return dpms;
 843 }
 844
 845 /**
 846  * drm_helper_connector_dpms() - connector dpms helper implementation
 847  * @connector: affected connector
 848  * @mode: DPMS mode
 849  *
 850  * This is the main helper function provided by the crtc helper framework for
 851  * implementing the DPMS connector attribute. It computes the new desired DPMS
 852  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 853  * callback provided by the driver appropriately.
 854  */
 855 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 856 {
 857         struct drm_encoder *encoder = connector->encoder;
 858         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 859         int old_dpms;
 860
 861         if (mode == connector->dpms)
 862                 return;
 863
 864         old_dpms = connector->dpms;
 865         connector->dpms = mode;
 866
 867         /* from off to on, do crtc then encoder */
 868         if (mode < old_dpms) {
 869                 if (crtc) {
 870                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 871                         if (crtc_funcs->dpms)
 872                                 (*crtc_funcs->dpms) (crtc,
 873                                                      drm_helper_choose_crtc_dpms(crtc));
 874                 }
 875                 if (encoder) {
 876                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 877                         if (encoder_funcs->dpms)
 878                                 (*encoder_funcs->dpms) (encoder,
 879                                                         drm_helper_choose_encoder_dpms(encoder));
 880                 }
 881         }
 882
 883         /* from on to off, do encoder then crtc */
 884         if (mode > old_dpms) {
 885                 if (encoder) {
 886                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 887                         if (encoder_funcs->dpms)
 888                                 (*encoder_funcs->dpms) (encoder,
 889                                                         drm_helper_choose_encoder_dpms(encoder));
 890                 }
 891                 if (crtc) {
 892                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 893                         if (crtc_funcs->dpms)
 894                                 (*crtc_funcs->dpms) (crtc,
 895                                                      drm_helper_choose_crtc_dpms(crtc));
 896                 }
 897         }
 898
 899         return;
 900 }
 901 EXPORT_SYMBOL(drm_helper_connector_dpms);
 902
 903 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 904                                    struct drm_mode_fb_cmd2 *mode_cmd)
 905 {
 906         int i;
 907
 908         fb->width = mode_cmd->width;
 909         fb->height = mode_cmd->height;
 910         for (i = 0; i < 4; i++) {
 911                 fb->pitches[i] = mode_cmd->pitches[i];
 912                 fb->offsets[i] = mode_cmd->offsets[i];
 913         }
 914         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 915                                     &fb->bits_per_pixel);
 916         fb->pixel_format = mode_cmd->pixel_format;
 917
 918         return 0;
 919 }
 920 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 921
 922 int drm_helper_resume_force_mode(struct drm_device *dev)
 923 {
 924         struct drm_crtc *crtc;
 925         struct drm_encoder *encoder;
 926         struct drm_encoder_helper_funcs *encoder_funcs;
 927         struct drm_crtc_helper_funcs *crtc_funcs;
 928         int ret;
 929
 930         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 931
 932                 if (!crtc->enabled)
 933                         continue;
 934
 935                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 936                                                crtc->x, crtc->y, crtc->fb);
 937
 938                 if (ret == false)
 939                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 940
 941                 /* Turn off outputs that were already powered off */
 942                 if (drm_helper_choose_crtc_dpms(crtc)) {
 943                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 944
 945                                 if(encoder->crtc != crtc)
 946                                         continue;
 947
 948                                 encoder_funcs = encoder->helper_private;
 949                                 if (encoder_funcs->dpms)
 950                                         (*encoder_funcs->dpms) (encoder,
 951                                                                 drm_helper_choose_encoder_dpms(encoder));
 952                         }
 953
 954                         crtc_funcs = crtc->helper_private;
 955                         if (crtc_funcs->dpms)
 956                                 (*crtc_funcs->dpms) (crtc,
 957                                                      drm_helper_choose_crtc_dpms(crtc));
 958                 }
 959         }
 960         /* disable the unused connectors while restoring the modesetting */
 961         drm_helper_disable_unused_functions(dev);
 962         return 0;
 963 }
 964 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 965
 966 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 967 {
 968         /* send a uevent + call fbdev */
 969 #ifdef FREEBSD_NOTYET
 970         drm_sysfs_hotplug_event(dev);
 971 #endif /* FREEBSD_NOTYET */
 972         if (dev->mode_config.funcs->output_poll_changed)
 973                 dev->mode_config.funcs->output_poll_changed(dev);
 974 }
 975 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
 976
 977 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 978 static void output_poll_execute(void *ctx, int pending)
 979 {
 980         struct drm_device *dev = ctx;
 981         struct drm_connector *connector;
 982         enum drm_connector_status old_status;
 983         bool repoll = false, changed = false;
 984
 985         if (!drm_kms_helper_poll)
 986                 return;
 987
 988         sx_xlock(&dev->mode_config.mutex);
 989         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 990
 991                 /* Ignore forced connectors. */
 992                 if (connector->force)
 993                         continue;
 994
 995                 /* Ignore HPD capable connectors and connectors where we don't
 996                  * want any hotplug detection at all for polling. */
 997                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
 998                         continue;
 999
1000                 repoll = true;
1001
1002                 old_status = connector->status;
1003                 /* if we are connected and don't want to poll for disconnect
1004                    skip it */
1005                 if (old_status == connector_status_connected &&
1006                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1007                         continue;
1008
1009                 connector->status = connector->funcs->detect(connector, false);
1010                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
1011                               connector->base.id,
1012                               drm_get_connector_name(connector),
1013                               old_status, connector->status);
1014                 if (old_status != connector->status)
1015                         changed = true;
1016         }
1017
1018         sx_xunlock(&dev->mode_config.mutex);
1019
1020         if (changed)
1021                 drm_kms_helper_hotplug_event(dev);
1022
1023         if (repoll)
1024                 taskqueue_enqueue_timeout(taskqueue_thread,
1025                     &dev->mode_config.output_poll_work,
1026                     DRM_OUTPUT_POLL_PERIOD);
1027 }
1028
1029 void drm_kms_helper_poll_disable(struct drm_device *dev)
1030 {
1031         if (!dev->mode_config.poll_enabled)
1032                 return;
1033         taskqueue_cancel_timeout(taskqueue_thread,
1034             &dev->mode_config.output_poll_work, NULL);
1035 }
1036 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1037
1038 void drm_kms_helper_poll_enable(struct drm_device *dev)
1039 {
1040         bool poll = false;
1041         struct drm_connector *connector;
1042
1043         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1044                 return;
1045
1046         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1047                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1048                                          DRM_CONNECTOR_POLL_DISCONNECT))
1049                         poll = true;
1050         }
1051
1052         if (poll)
1053                 taskqueue_enqueue_timeout(taskqueue_thread,
1054                     &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1055 }
1056 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1057
1058 void drm_kms_helper_poll_init(struct drm_device *dev)
1059 {
1060         TIMEOUT_TASK_INIT(taskqueue_thread, &dev->mode_config.output_poll_work,
1061             0, output_poll_execute, dev);
1062         dev->mode_config.poll_enabled = true;
1063
1064         drm_kms_helper_poll_enable(dev);
1065 }
1066 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1067
1068 void drm_kms_helper_poll_fini(struct drm_device *dev)
1069 {
1070         drm_kms_helper_poll_disable(dev);
1071 }
1072 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1073
1074 void drm_helper_hpd_irq_event(struct drm_device *dev)
1075 {
1076         struct drm_connector *connector;
1077         enum drm_connector_status old_status;
1078         bool changed = false;
1079
1080         if (!dev->mode_config.poll_enabled)
1081                 return;
1082
1083         sx_xlock(&dev->mode_config.mutex);
1084         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1085
1086                 /* Only handle HPD capable connectors. */
1087                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1088                         continue;
1089
1090                 old_status = connector->status;
1091
1092                 connector->status = connector->funcs->detect(connector, false);
1093                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
1094                               connector->base.id,
1095                               drm_get_connector_name(connector),
1096                               old_status, connector->status);
1097                 if (old_status != connector->status)
1098                         changed = true;
1099         }
1100
1101         sx_xunlock(&dev->mode_config.mutex);
1102
1103         if (changed)
1104                 drm_kms_helper_hotplug_event(dev);
1105 }
1106 EXPORT_SYMBOL(drm_helper_hpd_irq_event);