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