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