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