drivers/gpu/drm/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  *
   5  * DRM core CRTC related functions
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that copyright
  10  * notice and this permission notice appear in supporting documentation, and
  11  * that the name of the copyright holders not be used in advertising or
  12  * publicity pertaining to distribution of the software without specific,
  13  * written prior permission.  The copyright holders make no representations
  14  * about the suitability of this software for any purpose.  It is provided "as
  15  * is" without express or implied warranty.
  16  *
  17  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23  * OF THIS SOFTWARE.
  24  *
  25  * Authors:
  26  *      Keith Packard
  27  *      Eric Anholt <eric@anholt.net>
  28  *      Dave Airlie <airlied@linux.ie>
  29  *      Jesse Barnes <jesse.barnes@intel.com>
  30  */
  31
  32 #include <linux/export.h>
  33 #include <linux/moduleparam.h>
  34
  35 #include <drm/drmP.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_fourcc.h>
  38 #include <drm/drm_crtc_helper.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_edid.h>
  41
  42 /**
  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 CONFIG_DRM_LOAD_EDID_FIRMWARE
 156         count = drm_load_edid_firmware(connector);
 157         if (count == 0)
 158 #endif
 159                 count = (*connector_funcs->get_modes)(connector);
 160
 161         if (count == 0 && connector->status == connector_status_connected)
 162                 count = drm_add_modes_noedid(connector, 1024, 768);
 163         if (count == 0)
 164                 goto prune;
 165
 166         drm_mode_connector_list_update(connector);
 167
 168         if (maxX && maxY)
 169                 drm_mode_validate_size(dev, &connector->modes, maxX,
 170                                        maxY, 0);
 171
 172         if (connector->interlace_allowed)
 173                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 174         if (connector->doublescan_allowed)
 175                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 176         drm_mode_validate_flag(connector, mode_flags);
 177
 178         list_for_each_entry(mode, &connector->modes, head) {
 179                 if (mode->status == MODE_OK)
 180                         mode->status = connector_funcs->mode_valid(connector,
 181                                                                    mode);
 182         }
 183
 184 prune:
 185         drm_mode_prune_invalid(dev, &connector->modes, true);
 186
 187         if (list_empty(&connector->modes))
 188                 return 0;
 189
 190         drm_mode_sort(&connector->modes);
 191
 192         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 193                         drm_get_connector_name(connector));
 194         list_for_each_entry(mode, &connector->modes, head) {
 195                 mode->vrefresh = drm_mode_vrefresh(mode);
 196
 197                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 198                 drm_mode_debug_printmodeline(mode);
 199         }
 200
 201         return count;
 202 }
 203 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 204
 205 /**
 206  * drm_helper_encoder_in_use - check if a given encoder is in use
 207  * @encoder: encoder to check
 208  *
 209  * LOCKING:
 210  * Caller must hold mode config lock.
 211  *
 212  * Walk @encoders's DRM device's mode_config and see if it's in use.
 213  *
 214  * RETURNS:
 215  * True if @encoder is part of the mode_config, false otherwise.
 216  */
 217 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 218 {
 219         struct drm_connector *connector;
 220         struct drm_device *dev = encoder->dev;
 221         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 222                 if (connector->encoder == encoder)
 223                         return true;
 224         return false;
 225 }
 226 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 227
 228 /**
 229  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 230  * @crtc: CRTC to check
 231  *
 232  * LOCKING:
 233  * Caller must hold mode config lock.
 234  *
 235  * Walk @crtc's DRM device's mode_config and see if it's in use.
 236  *
 237  * RETURNS:
 238  * True if @crtc is part of the mode_config, false otherwise.
 239  */
 240 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 241 {
 242         struct drm_encoder *encoder;
 243         struct drm_device *dev = crtc->dev;
 244         /* FIXME: Locking around list access? */
 245         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 246                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 247                         return true;
 248         return false;
 249 }
 250 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 251
 252 static void
 253 drm_encoder_disable(struct drm_encoder *encoder)
 254 {
 255         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 256
 257         if (encoder_funcs->disable)
 258                 (*encoder_funcs->disable)(encoder);
 259         else
 260                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 261 }
 262
 263 /**
 264  * drm_helper_disable_unused_functions - disable unused objects
 265  * @dev: DRM device
 266  *
 267  * LOCKING:
 268  * Caller must hold mode config lock.
 269  *
 270  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 271  * by calling its dpms function, which should power it off.
 272  */
 273 void drm_helper_disable_unused_functions(struct drm_device *dev)
 274 {
 275         struct drm_encoder *encoder;
 276         struct drm_connector *connector;
 277         struct drm_crtc *crtc;
 278
 279         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 280                 if (!connector->encoder)
 281                         continue;
 282                 if (connector->status == connector_status_disconnected)
 283                         connector->encoder = NULL;
 284         }
 285
 286         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 287                 if (!drm_helper_encoder_in_use(encoder)) {
 288                         drm_encoder_disable(encoder);
 289                         /* disconnector encoder from any connector */
 290                         encoder->crtc = NULL;
 291                 }
 292         }
 293
 294         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 295                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 296                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 297                 if (!crtc->enabled) {
 298                         if (crtc_funcs->disable)
 299                                 (*crtc_funcs->disable)(crtc);
 300                         else
 301                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 302                         crtc->fb = NULL;
 303                 }
 304         }
 305 }
 306 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 307
 308 /**
 309  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 310  * @encoder: encoder to test
 311  * @crtc: crtc to test
 312  *
 313  * Return false if @encoder can't be driven by @crtc, true otherwise.
 314  */
 315 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 316                                 struct drm_crtc *crtc)
 317 {
 318         struct drm_device *dev;
 319         struct drm_crtc *tmp;
 320         int crtc_mask = 1;
 321
 322         WARN(!crtc, "checking null crtc?\n");
 323
 324         dev = crtc->dev;
 325
 326         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 327                 if (tmp == crtc)
 328                         break;
 329                 crtc_mask <<= 1;
 330         }
 331
 332         if (encoder->possible_crtcs & crtc_mask)
 333                 return true;
 334         return false;
 335 }
 336
 337 /*
 338  * Check the CRTC we're going to map each output to vs. its current
 339  * CRTC.  If they don't match, we have to disable the output and the CRTC
 340  * since the driver will have to re-route things.
 341  */
 342 static void
 343 drm_crtc_prepare_encoders(struct drm_device *dev)
 344 {
 345         struct drm_encoder_helper_funcs *encoder_funcs;
 346         struct drm_encoder *encoder;
 347
 348         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 349                 encoder_funcs = encoder->helper_private;
 350                 /* Disable unused encoders */
 351                 if (encoder->crtc == NULL)
 352                         drm_encoder_disable(encoder);
 353                 /* Disable encoders whose CRTC is about to change */
 354                 if (encoder_funcs->get_crtc &&
 355                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 356                         drm_encoder_disable(encoder);
 357         }
 358 }
 359
 360 /**
 361  * drm_crtc_helper_set_mode - internal helper to set a mode
 362  * @crtc: CRTC to program
 363  * @mode: mode to use
 364  * @x: horizontal offset into the surface
 365  * @y: vertical offset into the surface
 366  * @old_fb: old framebuffer, for cleanup
 367  *
 368  * LOCKING:
 369  * Caller must hold mode config lock.
 370  *
 371  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 372  * to fixup or reject the mode prior to trying to set it. This is an internal
 373  * helper that drivers could e.g. use to update properties that require the
 374  * entire output pipe to be disabled and re-enabled in a new configuration. For
 375  * example for changing whether audio is enabled on a hdmi link or for changing
 376  * panel fitter or dither attributes. It is also called by the
 377  * drm_crtc_helper_set_config() helper function to drive the mode setting
 378  * sequence.
 379  *
 380  * RETURNS:
 381  * True if the mode was set successfully, or false otherwise.
 382  */
 383 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 384                               struct drm_display_mode *mode,
 385                               int x, int y,
 386                               struct drm_framebuffer *old_fb)
 387 {
 388         struct drm_device *dev = crtc->dev;
 389         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 390         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 391         struct drm_encoder_helper_funcs *encoder_funcs;
 392         int saved_x, saved_y;
 393         struct drm_encoder *encoder;
 394         bool ret = true;
 395
 396         crtc->enabled = drm_helper_crtc_in_use(crtc);
 397         if (!crtc->enabled)
 398                 return true;
 399
 400         adjusted_mode = drm_mode_duplicate(dev, mode);
 401         if (!adjusted_mode)
 402                 return false;
 403
 404         saved_hwmode = crtc->hwmode;
 405         saved_mode = crtc->mode;
 406         saved_x = crtc->x;
 407         saved_y = crtc->y;
 408
 409         /* Update crtc values up front so the driver can rely on them for mode
 410          * setting.
 411          */
 412         crtc->mode = *mode;
 413         crtc->x = x;
 414         crtc->y = y;
 415
 416         /* Pass our mode to the connectors and the CRTC to give them a chance to
 417          * adjust it according to limitations or connector properties, and also
 418          * a chance to reject the mode entirely.
 419          */
 420         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 421
 422                 if (encoder->crtc != crtc)
 423                         continue;
 424                 encoder_funcs = encoder->helper_private;
 425                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 426                                                       adjusted_mode))) {
 427                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 428                         goto done;
 429                 }
 430         }
 431
 432         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 433                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 434                 goto done;
 435         }
 436         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 437
 438         /* Prepare the encoders and CRTCs before setting the mode. */
 439         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 440
 441                 if (encoder->crtc != crtc)
 442                         continue;
 443                 encoder_funcs = encoder->helper_private;
 444                 /* Disable the encoders as the first thing we do. */
 445                 encoder_funcs->prepare(encoder);
 446         }
 447
 448         drm_crtc_prepare_encoders(dev);
 449
 450         crtc_funcs->prepare(crtc);
 451
 452         /* Set up the DPLL and any encoders state that needs to adjust or depend
 453          * on the DPLL.
 454          */
 455         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 456         if (!ret)
 457             goto done;
 458
 459         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 460
 461                 if (encoder->crtc != crtc)
 462                         continue;
 463
 464                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 465                         encoder->base.id, drm_get_encoder_name(encoder),
 466                         mode->base.id, mode->name);
 467                 encoder_funcs = encoder->helper_private;
 468                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 469         }
 470
 471         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 472         crtc_funcs->commit(crtc);
 473
 474         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 475
 476                 if (encoder->crtc != crtc)
 477                         continue;
 478
 479                 encoder_funcs = encoder->helper_private;
 480                 encoder_funcs->commit(encoder);
 481
 482         }
 483
 484         /* Store real post-adjustment hardware mode. */
 485         crtc->hwmode = *adjusted_mode;
 486
 487         /* Calculate and store various constants which
 488          * are later needed by vblank and swap-completion
 489          * timestamping. They are derived from true hwmode.
 490          */
 491         drm_calc_timestamping_constants(crtc);
 492
 493         /* FIXME: add subpixel order */
 494 done:
 495         drm_mode_destroy(dev, adjusted_mode);
 496         if (!ret) {
 497                 crtc->hwmode = saved_hwmode;
 498                 crtc->mode = saved_mode;
 499                 crtc->x = saved_x;
 500                 crtc->y = saved_y;
 501         }
 502
 503         return ret;
 504 }
 505 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 506
 507
 508 static int
 509 drm_crtc_helper_disable(struct drm_crtc *crtc)
 510 {
 511         struct drm_device *dev = crtc->dev;
 512         struct drm_connector *connector;
 513         struct drm_encoder *encoder;
 514
 515         /* Decouple all encoders and their attached connectors from this crtc */
 516         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 517                 if (encoder->crtc != crtc)
 518                         continue;
 519
 520                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 521                         if (connector->encoder != encoder)
 522                                 continue;
 523
 524                         connector->encoder = NULL;
 525                 }
 526         }
 527
 528         drm_helper_disable_unused_functions(dev);
 529         return 0;
 530 }
 531
 532 /**
 533  * drm_crtc_helper_set_config - set a new config from userspace
 534  * @set: mode set configuration
 535  *
 536  * LOCKING:
 537  * Caller must hold mode config lock.
 538  *
 539  * Setup a new configuration, provided by the upper layers (either an ioctl call
 540  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 541  * enable it. This is the main helper functions for drivers that implement
 542  * kernel mode setting with the crtc helper functions and the assorted
 543  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 544  *
 545  * RETURNS:
 546  * Returns 0 on success, -ERRNO on failure.
 547  */
 548 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 549 {
 550         struct drm_device *dev;
 551         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 552         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 553         struct drm_framebuffer *old_fb = NULL;
 554         bool mode_changed = false; /* if true do a full mode set */
 555         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 556         struct drm_connector *save_connectors, *connector;
 557         int count = 0, ro, fail = 0;
 558         struct drm_crtc_helper_funcs *crtc_funcs;
 559         struct drm_mode_set save_set;
 560         int ret;
 561         int i;
 562
 563         DRM_DEBUG_KMS("\n");
 564
 565         if (!set)
 566                 return -EINVAL;
 567
 568         if (!set->crtc)
 569                 return -EINVAL;
 570
 571         if (!set->crtc->helper_private)
 572                 return -EINVAL;
 573
 574         crtc_funcs = set->crtc->helper_private;
 575
 576         if (!set->mode)
 577                 set->fb = NULL;
 578
 579         if (set->fb) {
 580                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 581                                 set->crtc->base.id, set->fb->base.id,
 582                                 (int)set->num_connectors, set->x, set->y);
 583         } else {
 584                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 585                 return drm_crtc_helper_disable(set->crtc);
 586         }
 587
 588         dev = set->crtc->dev;
 589
 590         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 591          * connector data. */
 592         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 593                              sizeof(struct drm_crtc), GFP_KERNEL);
 594         if (!save_crtcs)
 595                 return -ENOMEM;
 596
 597         save_encoders = kzalloc(dev->mode_config.num_encoder *
 598                                 sizeof(struct drm_encoder), GFP_KERNEL);
 599         if (!save_encoders) {
 600                 kfree(save_crtcs);
 601                 return -ENOMEM;
 602         }
 603
 604         save_connectors = kzalloc(dev->mode_config.num_connector *
 605                                 sizeof(struct drm_connector), GFP_KERNEL);
 606         if (!save_connectors) {
 607                 kfree(save_crtcs);
 608                 kfree(save_encoders);
 609                 return -ENOMEM;
 610         }
 611
 612         /* Copy data. Note that driver private data is not affected.
 613          * Should anything bad happen only the expected state is
 614          * restored, not the drivers personal bookkeeping.
 615          */
 616         count = 0;
 617         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 618                 save_crtcs[count++] = *crtc;
 619         }
 620
 621         count = 0;
 622         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 623                 save_encoders[count++] = *encoder;
 624         }
 625
 626         count = 0;
 627         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 628                 save_connectors[count++] = *connector;
 629         }
 630
 631         save_set.crtc = set->crtc;
 632         save_set.mode = &set->crtc->mode;
 633         save_set.x = set->crtc->x;
 634         save_set.y = set->crtc->y;
 635         save_set.fb = set->crtc->fb;
 636
 637         /* We should be able to check here if the fb has the same properties
 638          * and then just flip_or_move it */
 639         if (set->crtc->fb != set->fb) {
 640                 /* If we have no fb then treat it as a full mode set */
 641                 if (set->crtc->fb == NULL) {
 642                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 643                         mode_changed = true;
 644                 } else if (set->fb == NULL) {
 645                         mode_changed = true;
 646                 } else if (set->fb->depth != set->crtc->fb->depth) {
 647                         mode_changed = true;
 648                 } else if (set->fb->bits_per_pixel !=
 649                            set->crtc->fb->bits_per_pixel) {
 650                         mode_changed = true;
 651                 } else
 652                         fb_changed = true;
 653         }
 654
 655         if (set->x != set->crtc->x || set->y != set->crtc->y)
 656                 fb_changed = true;
 657
 658         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 659                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 660                 drm_mode_debug_printmodeline(&set->crtc->mode);
 661                 drm_mode_debug_printmodeline(set->mode);
 662                 mode_changed = true;
 663         }
 664
 665         /* a) traverse passed in connector list and get encoders for them */
 666         count = 0;
 667         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 668                 struct drm_connector_helper_funcs *connector_funcs =
 669                         connector->helper_private;
 670                 new_encoder = connector->encoder;
 671                 for (ro = 0; ro < set->num_connectors; ro++) {
 672                         if (set->connectors[ro] == connector) {
 673                                 new_encoder = connector_funcs->best_encoder(connector);
 674                                 /* if we can't get an encoder for a connector
 675                                    we are setting now - then fail */
 676                                 if (new_encoder == NULL)
 677                                         /* don't break so fail path works correct */
 678                                         fail = 1;
 679                                 break;
 680                         }
 681                 }
 682
 683                 if (new_encoder != connector->encoder) {
 684                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 685                         mode_changed = true;
 686                         /* If the encoder is reused for another connector, then
 687                          * the appropriate crtc will be set later.
 688                          */
 689                         if (connector->encoder)
 690                                 connector->encoder->crtc = NULL;
 691                         connector->encoder = new_encoder;
 692                 }
 693         }
 694
 695         if (fail) {
 696                 ret = -EINVAL;
 697                 goto fail;
 698         }
 699
 700         count = 0;
 701         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 702                 if (!connector->encoder)
 703                         continue;
 704
 705                 if (connector->encoder->crtc == set->crtc)
 706                         new_crtc = NULL;
 707                 else
 708                         new_crtc = connector->encoder->crtc;
 709
 710                 for (ro = 0; ro < set->num_connectors; ro++) {
 711                         if (set->connectors[ro] == connector)
 712                                 new_crtc = set->crtc;
 713                 }
 714
 715                 /* Make sure the new CRTC will work with the encoder */
 716                 if (new_crtc &&
 717                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 718                         ret = -EINVAL;
 719                         goto fail;
 720                 }
 721                 if (new_crtc != connector->encoder->crtc) {
 722                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 723                         mode_changed = true;
 724                         connector->encoder->crtc = new_crtc;
 725                 }
 726                 if (new_crtc) {
 727                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 728                                 connector->base.id, drm_get_connector_name(connector),
 729                                 new_crtc->base.id);
 730                 } else {
 731                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 732                                 connector->base.id, drm_get_connector_name(connector));
 733                 }
 734         }
 735
 736         /* mode_set_base is not a required function */
 737         if (fb_changed && !crtc_funcs->mode_set_base)
 738                 mode_changed = true;
 739
 740         if (mode_changed) {
 741                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 742                 if (set->crtc->enabled) {
 743                         DRM_DEBUG_KMS("attempting to set mode from"
 744                                         " userspace\n");
 745                         drm_mode_debug_printmodeline(set->mode);
 746                         old_fb = set->crtc->fb;
 747                         set->crtc->fb = set->fb;
 748                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 749                                                       set->x, set->y,
 750                                                       old_fb)) {
 751                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 752                                           set->crtc->base.id);
 753                                 set->crtc->fb = old_fb;
 754                                 ret = -EINVAL;
 755                                 goto fail;
 756                         }
 757                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 758                         for (i = 0; i < set->num_connectors; i++) {
 759                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 760                                               drm_get_connector_name(set->connectors[i]));
 761                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 762                         }
 763                 }
 764                 drm_helper_disable_unused_functions(dev);
 765         } else if (fb_changed) {
 766                 set->crtc->x = set->x;
 767                 set->crtc->y = set->y;
 768
 769                 old_fb = set->crtc->fb;
 770                 if (set->crtc->fb != set->fb)
 771                         set->crtc->fb = set->fb;
 772                 ret = crtc_funcs->mode_set_base(set->crtc,
 773                                                 set->x, set->y, old_fb);
 774                 if (ret != 0) {
 775                         set->crtc->fb = old_fb;
 776                         goto fail;
 777                 }
 778         }
 779
 780         kfree(save_connectors);
 781         kfree(save_encoders);
 782         kfree(save_crtcs);
 783         return 0;
 784
 785 fail:
 786         /* Restore all previous data. */
 787         count = 0;
 788         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 789                 *crtc = save_crtcs[count++];
 790         }
 791
 792         count = 0;
 793         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 794                 *encoder = save_encoders[count++];
 795         }
 796
 797         count = 0;
 798         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 799                 *connector = save_connectors[count++];
 800         }
 801
 802         /* Try to restore the config */
 803         if (mode_changed &&
 804             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 805                                       save_set.y, save_set.fb))
 806                 DRM_ERROR("failed to restore config after modeset failure\n");
 807
 808         kfree(save_connectors);
 809         kfree(save_encoders);
 810         kfree(save_crtcs);
 811         return ret;
 812 }
 813 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 814
 815 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 816 {
 817         int dpms = DRM_MODE_DPMS_OFF;
 818         struct drm_connector *connector;
 819         struct drm_device *dev = encoder->dev;
 820
 821         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 822                 if (connector->encoder == encoder)
 823                         if (connector->dpms < dpms)
 824                                 dpms = connector->dpms;
 825         return dpms;
 826 }
 827
 828 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 829 {
 830         int dpms = DRM_MODE_DPMS_OFF;
 831         struct drm_connector *connector;
 832         struct drm_device *dev = crtc->dev;
 833
 834         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 835                 if (connector->encoder && connector->encoder->crtc == crtc)
 836                         if (connector->dpms < dpms)
 837                                 dpms = connector->dpms;
 838         return dpms;
 839 }
 840
 841 /**
 842  * drm_helper_connector_dpms() - connector dpms helper implementation
 843  * @connector: affected connector
 844  * @mode: DPMS mode
 845  *
 846  * This is the main helper function provided by the crtc helper framework for
 847  * implementing the DPMS connector attribute. It computes the new desired DPMS
 848  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 849  * callback provided by the driver appropriately.
 850  */
 851 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 852 {
 853         struct drm_encoder *encoder = connector->encoder;
 854         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 855         int old_dpms;
 856
 857         if (mode == connector->dpms)
 858                 return;
 859
 860         old_dpms = connector->dpms;
 861         connector->dpms = mode;
 862
 863         /* from off to on, do crtc then encoder */
 864         if (mode < old_dpms) {
 865                 if (crtc) {
 866                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 867                         if (crtc_funcs->dpms)
 868                                 (*crtc_funcs->dpms) (crtc,
 869                                                      drm_helper_choose_crtc_dpms(crtc));
 870                 }
 871                 if (encoder) {
 872                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 873                         if (encoder_funcs->dpms)
 874                                 (*encoder_funcs->dpms) (encoder,
 875                                                         drm_helper_choose_encoder_dpms(encoder));
 876                 }
 877         }
 878
 879         /* from on to off, do encoder then crtc */
 880         if (mode > old_dpms) {
 881                 if (encoder) {
 882                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 883                         if (encoder_funcs->dpms)
 884                                 (*encoder_funcs->dpms) (encoder,
 885                                                         drm_helper_choose_encoder_dpms(encoder));
 886                 }
 887                 if (crtc) {
 888                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 889                         if (crtc_funcs->dpms)
 890                                 (*crtc_funcs->dpms) (crtc,
 891                                                      drm_helper_choose_crtc_dpms(crtc));
 892                 }
 893         }
 894
 895         return;
 896 }
 897 EXPORT_SYMBOL(drm_helper_connector_dpms);
 898
 899 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 900                                    struct drm_mode_fb_cmd2 *mode_cmd)
 901 {
 902         int i;
 903
 904         fb->width = mode_cmd->width;
 905         fb->height = mode_cmd->height;
 906         for (i = 0; i < 4; i++) {
 907                 fb->pitches[i] = mode_cmd->pitches[i];
 908                 fb->offsets[i] = mode_cmd->offsets[i];
 909         }
 910         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 911                                     &fb->bits_per_pixel);
 912         fb->pixel_format = mode_cmd->pixel_format;
 913
 914         return 0;
 915 }
 916 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 917
 918 int drm_helper_resume_force_mode(struct drm_device *dev)
 919 {
 920         struct drm_crtc *crtc;
 921         struct drm_encoder *encoder;
 922         struct drm_encoder_helper_funcs *encoder_funcs;
 923         struct drm_crtc_helper_funcs *crtc_funcs;
 924         int ret;
 925
 926         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 927
 928                 if (!crtc->enabled)
 929                         continue;
 930
 931                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 932                                                crtc->x, crtc->y, crtc->fb);
 933
 934                 if (ret == false)
 935                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 936
 937                 /* Turn off outputs that were already powered off */
 938                 if (drm_helper_choose_crtc_dpms(crtc)) {
 939                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 940
 941                                 if(encoder->crtc != crtc)
 942                                         continue;
 943
 944                                 encoder_funcs = encoder->helper_private;
 945                                 if (encoder_funcs->dpms)
 946                                         (*encoder_funcs->dpms) (encoder,
 947                                                                 drm_helper_choose_encoder_dpms(encoder));
 948                         }
 949
 950                         crtc_funcs = crtc->helper_private;
 951                         if (crtc_funcs->dpms)
 952                                 (*crtc_funcs->dpms) (crtc,
 953                                                      drm_helper_choose_crtc_dpms(crtc));
 954                 }
 955         }
 956         /* disable the unused connectors while restoring the modesetting */
 957         drm_helper_disable_unused_functions(dev);
 958         return 0;
 959 }
 960 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 961
 962 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 963 {
 964         /* send a uevent + call fbdev */
 965         drm_sysfs_hotplug_event(dev);
 966         if (dev->mode_config.funcs->output_poll_changed)
 967                 dev->mode_config.funcs->output_poll_changed(dev);
 968 }
 969 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
 970
 971 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 972 static void output_poll_execute(struct work_struct *work)
 973 {
 974         struct delayed_work *delayed_work = to_delayed_work(work);
 975         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 976         struct drm_connector *connector;
 977         enum drm_connector_status old_status;
 978         bool repoll = false, changed = false;
 979
 980         if (!drm_kms_helper_poll)
 981                 return;
 982
 983         mutex_lock(&dev->mode_config.mutex);
 984         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 985
 986                 /* Ignore forced connectors. */
 987                 if (connector->force)
 988                         continue;
 989
 990                 /* Ignore HPD capable connectors and connectors where we don't
 991                  * want any hotplug detection at all for polling. */
 992                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
 993                         continue;
 994
 995                 repoll = true;
 996
 997                 old_status = connector->status;
 998                 /* if we are connected and don't want to poll for disconnect
 999                    skip it */
1000                 if (old_status == connector_status_connected &&
1001                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1002                         continue;
1003
1004                 connector->status = connector->funcs->detect(connector, false);
1005                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
1006                               connector->base.id,
1007                               drm_get_connector_name(connector),
1008                               old_status, connector->status);
1009                 if (old_status != connector->status)
1010                         changed = true;
1011         }
1012
1013         mutex_unlock(&dev->mode_config.mutex);
1014
1015         if (changed)
1016                 drm_kms_helper_hotplug_event(dev);
1017
1018         if (repoll)
1019                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1020 }
1021
1022 void drm_kms_helper_poll_disable(struct drm_device *dev)
1023 {
1024         if (!dev->mode_config.poll_enabled)
1025                 return;
1026         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1027 }
1028 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1029
1030 void drm_kms_helper_poll_enable(struct drm_device *dev)
1031 {
1032         bool poll = false;
1033         struct drm_connector *connector;
1034
1035         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1036                 return;
1037
1038         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1039                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1040                                          DRM_CONNECTOR_POLL_DISCONNECT))
1041                         poll = true;
1042         }
1043
1044         if (poll)
1045                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1046 }
1047 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1048
1049 void drm_kms_helper_poll_init(struct drm_device *dev)
1050 {
1051         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1052         dev->mode_config.poll_enabled = true;
1053
1054         drm_kms_helper_poll_enable(dev);
1055 }
1056 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1057
1058 void drm_kms_helper_poll_fini(struct drm_device *dev)
1059 {
1060         drm_kms_helper_poll_disable(dev);
1061 }
1062 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1063
1064 void drm_helper_hpd_irq_event(struct drm_device *dev)
1065 {
1066         struct drm_connector *connector;
1067         enum drm_connector_status old_status;
1068         bool changed = false;
1069
1070         if (!dev->mode_config.poll_enabled)
1071                 return;
1072
1073         mutex_lock(&dev->mode_config.mutex);
1074         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1075
1076                 /* Only handle HPD capable connectors. */
1077                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1078                         continue;
1079
1080                 old_status = connector->status;
1081
1082                 connector->status = connector->funcs->detect(connector, false);
1083                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
1084                               connector->base.id,
1085                               drm_get_connector_name(connector),
1086                               old_status, connector->status);
1087                 if (old_status != connector->status)
1088                         changed = true;
1089         }
1090
1091         mutex_unlock(&dev->mode_config.mutex);
1092
1093         if (changed)
1094                 drm_kms_helper_hotplug_event(dev);
1095 }
1096 EXPORT_SYMBOL(drm_helper_hpd_irq_event);