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 #include "drm_edid.h"
  41
  42 static bool drm_kms_helper_poll = true;
  43 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  44
  45 static void drm_mode_validate_flag(struct drm_connector *connector,
  46                                    int flags)
  47 {
  48         struct drm_display_mode *mode;
  49
  50         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  51                 return;
  52
  53         list_for_each_entry(mode, &connector->modes, head) {
  54                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  55                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  56                         mode->status = MODE_NO_INTERLACE;
  57                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  58                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  59                         mode->status = MODE_NO_DBLESCAN;
  60         }
  61
  62         return;
  63 }
  64
  65 /**
  66  * drm_helper_probe_single_connector_modes - get complete set of display modes
  67  * @dev: DRM device
  68  * @maxX: max width for modes
  69  * @maxY: max height for modes
  70  *
  71  * LOCKING:
  72  * Caller must hold mode config lock.
  73  *
  74  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  75  * modes on them.  Modes will first be added to the connector's probed_modes
  76  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  77  * put into the normal modes list.
  78  *
  79  * Intended to be used either at bootup time or when major configuration
  80  * changes have occurred.
  81  *
  82  * FIXME: take into account monitor limits
  83  *
  84  * RETURNS:
  85  * Number of modes found on @connector.
  86  */
  87 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  88                                             uint32_t maxX, uint32_t maxY)
  89 {
  90         struct drm_device *dev = connector->dev;
  91         struct drm_display_mode *mode;
  92         struct drm_connector_helper_funcs *connector_funcs =
  93                 connector->helper_private;
  94         int count = 0;
  95         int mode_flags = 0;
  96
  97         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
  98                         drm_get_connector_name(connector));
  99         /* set all modes to the unverified state */
 100         list_for_each_entry(mode, &connector->modes, head)
 101                 mode->status = MODE_UNVERIFIED;
 102
 103         if (connector->force) {
 104                 if (connector->force == DRM_FORCE_ON)
 105                         connector->status = connector_status_connected;
 106                 else
 107                         connector->status = connector_status_disconnected;
 108                 if (connector->funcs->force)
 109                         connector->funcs->force(connector);
 110         } else {
 111                 connector->status = connector->funcs->detect(connector, true);
 112                 drm_kms_helper_poll_enable(dev);
 113         }
 114
 115         if (connector->status == connector_status_disconnected) {
 116                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 117                         connector->base.id, drm_get_connector_name(connector));
 118                 drm_mode_connector_update_edid_property(connector, NULL);
 119                 goto prune;
 120         }
 121
 122 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 123         count = drm_load_edid_firmware(connector);
 124         if (count == 0)
 125 #endif
 126                 count = (*connector_funcs->get_modes)(connector);
 127
 128         if (count == 0 && connector->status == connector_status_connected)
 129                 count = drm_add_modes_noedid(connector, 1024, 768);
 130         if (count == 0)
 131                 goto prune;
 132
 133         drm_mode_connector_list_update(connector);
 134
 135         if (maxX && maxY)
 136                 drm_mode_validate_size(dev, &connector->modes, maxX,
 137                                        maxY, 0);
 138
 139         if (connector->interlace_allowed)
 140                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 141         if (connector->doublescan_allowed)
 142                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 143         drm_mode_validate_flag(connector, mode_flags);
 144
 145         list_for_each_entry(mode, &connector->modes, head) {
 146                 if (mode->status == MODE_OK)
 147                         mode->status = connector_funcs->mode_valid(connector,
 148                                                                    mode);
 149         }
 150
 151 prune:
 152         drm_mode_prune_invalid(dev, &connector->modes, true);
 153
 154         if (list_empty(&connector->modes))
 155                 return 0;
 156
 157         drm_mode_sort(&connector->modes);
 158
 159         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 160                         drm_get_connector_name(connector));
 161         list_for_each_entry(mode, &connector->modes, head) {
 162                 mode->vrefresh = drm_mode_vrefresh(mode);
 163
 164                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 165                 drm_mode_debug_printmodeline(mode);
 166         }
 167
 168         return count;
 169 }
 170 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 171
 172 /**
 173  * drm_helper_encoder_in_use - check if a given encoder is in use
 174  * @encoder: encoder to check
 175  *
 176  * LOCKING:
 177  * Caller must hold mode config lock.
 178  *
 179  * Walk @encoders's DRM device's mode_config and see if it's in use.
 180  *
 181  * RETURNS:
 182  * True if @encoder is part of the mode_config, false otherwise.
 183  */
 184 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 185 {
 186         struct drm_connector *connector;
 187         struct drm_device *dev = encoder->dev;
 188         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 189                 if (connector->encoder == encoder)
 190                         return true;
 191         return false;
 192 }
 193 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 194
 195 /**
 196  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 197  * @crtc: CRTC to check
 198  *
 199  * LOCKING:
 200  * Caller must hold mode config lock.
 201  *
 202  * Walk @crtc's DRM device's mode_config and see if it's in use.
 203  *
 204  * RETURNS:
 205  * True if @crtc is part of the mode_config, false otherwise.
 206  */
 207 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 208 {
 209         struct drm_encoder *encoder;
 210         struct drm_device *dev = crtc->dev;
 211         /* FIXME: Locking around list access? */
 212         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 213                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 214                         return true;
 215         return false;
 216 }
 217 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 218
 219 static void
 220 drm_encoder_disable(struct drm_encoder *encoder)
 221 {
 222         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 223
 224         if (encoder_funcs->disable)
 225                 (*encoder_funcs->disable)(encoder);
 226         else
 227                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 228 }
 229
 230 /**
 231  * drm_helper_disable_unused_functions - disable unused objects
 232  * @dev: DRM device
 233  *
 234  * LOCKING:
 235  * Caller must hold mode config lock.
 236  *
 237  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 238  * by calling its dpms function, which should power it off.
 239  */
 240 void drm_helper_disable_unused_functions(struct drm_device *dev)
 241 {
 242         struct drm_encoder *encoder;
 243         struct drm_connector *connector;
 244         struct drm_crtc *crtc;
 245
 246         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 247                 if (!connector->encoder)
 248                         continue;
 249                 if (connector->status == connector_status_disconnected)
 250                         connector->encoder = NULL;
 251         }
 252
 253         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 254                 if (!drm_helper_encoder_in_use(encoder)) {
 255                         drm_encoder_disable(encoder);
 256                         /* disconnector encoder from any connector */
 257                         encoder->crtc = NULL;
 258                 }
 259         }
 260
 261         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 262                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 263                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 264                 if (!crtc->enabled) {
 265                         if (crtc_funcs->disable)
 266                                 (*crtc_funcs->disable)(crtc);
 267                         else
 268                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 269                         crtc->fb = NULL;
 270                 }
 271         }
 272 }
 273 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 274
 275 /**
 276  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 277  * @encoder: encoder to test
 278  * @crtc: crtc to test
 279  *
 280  * Return false if @encoder can't be driven by @crtc, true otherwise.
 281  */
 282 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 283                                 struct drm_crtc *crtc)
 284 {
 285         struct drm_device *dev;
 286         struct drm_crtc *tmp;
 287         int crtc_mask = 1;
 288
 289         WARN(!crtc, "checking null crtc?\n");
 290
 291         dev = crtc->dev;
 292
 293         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 294                 if (tmp == crtc)
 295                         break;
 296                 crtc_mask <<= 1;
 297         }
 298
 299         if (encoder->possible_crtcs & crtc_mask)
 300                 return true;
 301         return false;
 302 }
 303
 304 /*
 305  * Check the CRTC we're going to map each output to vs. its current
 306  * CRTC.  If they don't match, we have to disable the output and the CRTC
 307  * since the driver will have to re-route things.
 308  */
 309 static void
 310 drm_crtc_prepare_encoders(struct drm_device *dev)
 311 {
 312         struct drm_encoder_helper_funcs *encoder_funcs;
 313         struct drm_encoder *encoder;
 314
 315         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 316                 encoder_funcs = encoder->helper_private;
 317                 /* Disable unused encoders */
 318                 if (encoder->crtc == NULL)
 319                         drm_encoder_disable(encoder);
 320                 /* Disable encoders whose CRTC is about to change */
 321                 if (encoder_funcs->get_crtc &&
 322                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 323                         drm_encoder_disable(encoder);
 324         }
 325 }
 326
 327 /**
 328  * drm_crtc_set_mode - set a mode
 329  * @crtc: CRTC to program
 330  * @mode: mode to use
 331  * @x: width of mode
 332  * @y: height of mode
 333  *
 334  * LOCKING:
 335  * Caller must hold mode config lock.
 336  *
 337  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 338  * to fixup or reject the mode prior to trying to set it.
 339  *
 340  * RETURNS:
 341  * True if the mode was set successfully, or false otherwise.
 342  */
 343 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 344                               struct drm_display_mode *mode,
 345                               int x, int y,
 346                               struct drm_framebuffer *old_fb)
 347 {
 348         struct drm_device *dev = crtc->dev;
 349         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 350         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 351         struct drm_encoder_helper_funcs *encoder_funcs;
 352         int saved_x, saved_y;
 353         struct drm_encoder *encoder;
 354         bool ret = true;
 355
 356         crtc->enabled = drm_helper_crtc_in_use(crtc);
 357         if (!crtc->enabled)
 358                 return true;
 359
 360         adjusted_mode = drm_mode_duplicate(dev, mode);
 361         if (!adjusted_mode)
 362                 return false;
 363
 364         saved_hwmode = crtc->hwmode;
 365         saved_mode = crtc->mode;
 366         saved_x = crtc->x;
 367         saved_y = crtc->y;
 368
 369         /* Update crtc values up front so the driver can rely on them for mode
 370          * setting.
 371          */
 372         crtc->mode = *mode;
 373         crtc->x = x;
 374         crtc->y = y;
 375
 376         /* Pass our mode to the connectors and the CRTC to give them a chance to
 377          * adjust it according to limitations or connector properties, and also
 378          * a chance to reject the mode entirely.
 379          */
 380         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 381
 382                 if (encoder->crtc != crtc)
 383                         continue;
 384                 encoder_funcs = encoder->helper_private;
 385                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 386                                                       adjusted_mode))) {
 387                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 388                         goto done;
 389                 }
 390         }
 391
 392         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 393                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 394                 goto done;
 395         }
 396         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 397
 398         /* Prepare the encoders and CRTCs before setting the mode. */
 399         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 400
 401                 if (encoder->crtc != crtc)
 402                         continue;
 403                 encoder_funcs = encoder->helper_private;
 404                 /* Disable the encoders as the first thing we do. */
 405                 encoder_funcs->prepare(encoder);
 406         }
 407
 408         drm_crtc_prepare_encoders(dev);
 409
 410         crtc_funcs->prepare(crtc);
 411
 412         /* Set up the DPLL and any encoders state that needs to adjust or depend
 413          * on the DPLL.
 414          */
 415         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 416         if (!ret)
 417             goto done;
 418
 419         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 420
 421                 if (encoder->crtc != crtc)
 422                         continue;
 423
 424                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 425                         encoder->base.id, drm_get_encoder_name(encoder),
 426                         mode->base.id, mode->name);
 427                 encoder_funcs = encoder->helper_private;
 428                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 429         }
 430
 431         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 432         crtc_funcs->commit(crtc);
 433
 434         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 435
 436                 if (encoder->crtc != crtc)
 437                         continue;
 438
 439                 encoder_funcs = encoder->helper_private;
 440                 encoder_funcs->commit(encoder);
 441
 442         }
 443
 444         /* Store real post-adjustment hardware mode. */
 445         crtc->hwmode = *adjusted_mode;
 446
 447         /* Calculate and store various constants which
 448          * are later needed by vblank and swap-completion
 449          * timestamping. They are derived from true hwmode.
 450          */
 451         drm_calc_timestamping_constants(crtc);
 452
 453         /* FIXME: add subpixel order */
 454 done:
 455         drm_mode_destroy(dev, adjusted_mode);
 456         if (!ret) {
 457                 crtc->hwmode = saved_hwmode;
 458                 crtc->mode = saved_mode;
 459                 crtc->x = saved_x;
 460                 crtc->y = saved_y;
 461         }
 462
 463         return ret;
 464 }
 465 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 466
 467
 468 static int
 469 drm_crtc_helper_disable(struct drm_crtc *crtc)
 470 {
 471         struct drm_device *dev = crtc->dev;
 472         struct drm_connector *connector;
 473         struct drm_encoder *encoder;
 474
 475         /* Decouple all encoders and their attached connectors from this crtc */
 476         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 477                 if (encoder->crtc != crtc)
 478                         continue;
 479
 480                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 481                         if (connector->encoder != encoder)
 482                                 continue;
 483
 484                         connector->encoder = NULL;
 485                 }
 486         }
 487
 488         drm_helper_disable_unused_functions(dev);
 489         return 0;
 490 }
 491
 492 /**
 493  * drm_crtc_helper_set_config - set a new config from userspace
 494  * @crtc: CRTC to setup
 495  * @crtc_info: user provided configuration
 496  * @new_mode: new mode to set
 497  * @connector_set: set of connectors for the new config
 498  * @fb: new framebuffer
 499  *
 500  * LOCKING:
 501  * Caller must hold mode config lock.
 502  *
 503  * Setup a new configuration, provided by the user in @crtc_info, and enable
 504  * it.
 505  *
 506  * RETURNS:
 507  * Zero. (FIXME)
 508  */
 509 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 510 {
 511         struct drm_device *dev;
 512         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 513         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 514         struct drm_framebuffer *old_fb = NULL;
 515         bool mode_changed = false; /* if true do a full mode set */
 516         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 517         struct drm_connector *save_connectors, *connector;
 518         int count = 0, ro, fail = 0;
 519         struct drm_crtc_helper_funcs *crtc_funcs;
 520         struct drm_mode_set save_set;
 521         int ret = 0;
 522         int i;
 523
 524         DRM_DEBUG_KMS("\n");
 525
 526         if (!set)
 527                 return -EINVAL;
 528
 529         if (!set->crtc)
 530                 return -EINVAL;
 531
 532         if (!set->crtc->helper_private)
 533                 return -EINVAL;
 534
 535         crtc_funcs = set->crtc->helper_private;
 536
 537         if (!set->mode)
 538                 set->fb = NULL;
 539
 540         if (set->fb) {
 541                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 542                                 set->crtc->base.id, set->fb->base.id,
 543                                 (int)set->num_connectors, set->x, set->y);
 544         } else {
 545                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 546                 return drm_crtc_helper_disable(set->crtc);
 547         }
 548
 549         dev = set->crtc->dev;
 550
 551         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 552          * connector data. */
 553         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 554                              sizeof(struct drm_crtc), GFP_KERNEL);
 555         if (!save_crtcs)
 556                 return -ENOMEM;
 557
 558         save_encoders = kzalloc(dev->mode_config.num_encoder *
 559                                 sizeof(struct drm_encoder), GFP_KERNEL);
 560         if (!save_encoders) {
 561                 kfree(save_crtcs);
 562                 return -ENOMEM;
 563         }
 564
 565         save_connectors = kzalloc(dev->mode_config.num_connector *
 566                                 sizeof(struct drm_connector), GFP_KERNEL);
 567         if (!save_connectors) {
 568                 kfree(save_crtcs);
 569                 kfree(save_encoders);
 570                 return -ENOMEM;
 571         }
 572
 573         /* Copy data. Note that driver private data is not affected.
 574          * Should anything bad happen only the expected state is
 575          * restored, not the drivers personal bookkeeping.
 576          */
 577         count = 0;
 578         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 579                 save_crtcs[count++] = *crtc;
 580         }
 581
 582         count = 0;
 583         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 584                 save_encoders[count++] = *encoder;
 585         }
 586
 587         count = 0;
 588         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 589                 save_connectors[count++] = *connector;
 590         }
 591
 592         save_set.crtc = set->crtc;
 593         save_set.mode = &set->crtc->mode;
 594         save_set.x = set->crtc->x;
 595         save_set.y = set->crtc->y;
 596         save_set.fb = set->crtc->fb;
 597
 598         /* We should be able to check here if the fb has the same properties
 599          * and then just flip_or_move it */
 600         if (set->crtc->fb != set->fb) {
 601                 /* If we have no fb then treat it as a full mode set */
 602                 if (set->crtc->fb == NULL) {
 603                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 604                         mode_changed = true;
 605                 } else if (set->fb == NULL) {
 606                         mode_changed = true;
 607                 } else if (set->fb->depth != set->crtc->fb->depth) {
 608                         mode_changed = true;
 609                 } else if (set->fb->bits_per_pixel !=
 610                            set->crtc->fb->bits_per_pixel) {
 611                         mode_changed = true;
 612                 } else
 613                         fb_changed = true;
 614         }
 615
 616         if (set->x != set->crtc->x || set->y != set->crtc->y)
 617                 fb_changed = true;
 618
 619         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 620                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 621                 drm_mode_debug_printmodeline(&set->crtc->mode);
 622                 drm_mode_debug_printmodeline(set->mode);
 623                 mode_changed = true;
 624         }
 625
 626         /* a) traverse passed in connector list and get encoders for them */
 627         count = 0;
 628         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 629                 struct drm_connector_helper_funcs *connector_funcs =
 630                         connector->helper_private;
 631                 new_encoder = connector->encoder;
 632                 for (ro = 0; ro < set->num_connectors; ro++) {
 633                         if (set->connectors[ro] == connector) {
 634                                 new_encoder = connector_funcs->best_encoder(connector);
 635                                 /* if we can't get an encoder for a connector
 636                                    we are setting now - then fail */
 637                                 if (new_encoder == NULL)
 638                                         /* don't break so fail path works correct */
 639                                         fail = 1;
 640                                 break;
 641                         }
 642                 }
 643
 644                 if (new_encoder != connector->encoder) {
 645                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 646                         mode_changed = true;
 647                         /* If the encoder is reused for another connector, then
 648                          * the appropriate crtc will be set later.
 649                          */
 650                         if (connector->encoder)
 651                                 connector->encoder->crtc = NULL;
 652                         connector->encoder = new_encoder;
 653                 }
 654         }
 655
 656         if (fail) {
 657                 ret = -EINVAL;
 658                 goto fail;
 659         }
 660
 661         count = 0;
 662         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 663                 if (!connector->encoder)
 664                         continue;
 665
 666                 if (connector->encoder->crtc == set->crtc)
 667                         new_crtc = NULL;
 668                 else
 669                         new_crtc = connector->encoder->crtc;
 670
 671                 for (ro = 0; ro < set->num_connectors; ro++) {
 672                         if (set->connectors[ro] == connector)
 673                                 new_crtc = set->crtc;
 674                 }
 675
 676                 /* Make sure the new CRTC will work with the encoder */
 677                 if (new_crtc &&
 678                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 679                         ret = -EINVAL;
 680                         goto fail;
 681                 }
 682                 if (new_crtc != connector->encoder->crtc) {
 683                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 684                         mode_changed = true;
 685                         connector->encoder->crtc = new_crtc;
 686                 }
 687                 if (new_crtc) {
 688                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 689                                 connector->base.id, drm_get_connector_name(connector),
 690                                 new_crtc->base.id);
 691                 } else {
 692                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 693                                 connector->base.id, drm_get_connector_name(connector));
 694                 }
 695         }
 696
 697         /* mode_set_base is not a required function */
 698         if (fb_changed && !crtc_funcs->mode_set_base)
 699                 mode_changed = true;
 700
 701         if (mode_changed) {
 702                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 703                 if (set->crtc->enabled) {
 704                         DRM_DEBUG_KMS("attempting to set mode from"
 705                                         " userspace\n");
 706                         drm_mode_debug_printmodeline(set->mode);
 707                         old_fb = set->crtc->fb;
 708                         set->crtc->fb = set->fb;
 709                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 710                                                       set->x, set->y,
 711                                                       old_fb)) {
 712                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 713                                           set->crtc->base.id);
 714                                 set->crtc->fb = old_fb;
 715                                 ret = -EINVAL;
 716                                 goto fail;
 717                         }
 718                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 719                         for (i = 0; i < set->num_connectors; i++) {
 720                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 721                                               drm_get_connector_name(set->connectors[i]));
 722                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 723                         }
 724                 }
 725                 drm_helper_disable_unused_functions(dev);
 726         } else if (fb_changed) {
 727                 set->crtc->x = set->x;
 728                 set->crtc->y = set->y;
 729
 730                 old_fb = set->crtc->fb;
 731                 if (set->crtc->fb != set->fb)
 732                         set->crtc->fb = set->fb;
 733                 ret = crtc_funcs->mode_set_base(set->crtc,
 734                                                 set->x, set->y, old_fb);
 735                 if (ret != 0) {
 736                         set->crtc->fb = old_fb;
 737                         goto fail;
 738                 }
 739         }
 740
 741         kfree(save_connectors);
 742         kfree(save_encoders);
 743         kfree(save_crtcs);
 744         return 0;
 745
 746 fail:
 747         /* Restore all previous data. */
 748         count = 0;
 749         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 750                 *crtc = save_crtcs[count++];
 751         }
 752
 753         count = 0;
 754         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 755                 *encoder = save_encoders[count++];
 756         }
 757
 758         count = 0;
 759         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 760                 *connector = save_connectors[count++];
 761         }
 762
 763         /* Try to restore the config */
 764         if (mode_changed &&
 765             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 766                                       save_set.y, save_set.fb))
 767                 DRM_ERROR("failed to restore config after modeset failure\n");
 768
 769         kfree(save_connectors);
 770         kfree(save_encoders);
 771         kfree(save_crtcs);
 772         return ret;
 773 }
 774 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 775
 776 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 777 {
 778         int dpms = DRM_MODE_DPMS_OFF;
 779         struct drm_connector *connector;
 780         struct drm_device *dev = encoder->dev;
 781
 782         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 783                 if (connector->encoder == encoder)
 784                         if (connector->dpms < dpms)
 785                                 dpms = connector->dpms;
 786         return dpms;
 787 }
 788
 789 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 790 {
 791         int dpms = DRM_MODE_DPMS_OFF;
 792         struct drm_connector *connector;
 793         struct drm_device *dev = crtc->dev;
 794
 795         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 796                 if (connector->encoder && connector->encoder->crtc == crtc)
 797                         if (connector->dpms < dpms)
 798                                 dpms = connector->dpms;
 799         return dpms;
 800 }
 801
 802 /**
 803  * drm_helper_connector_dpms
 804  * @connector affected connector
 805  * @mode DPMS mode
 806  *
 807  * Calls the low-level connector DPMS function, then
 808  * calls appropriate encoder and crtc DPMS functions as well
 809  */
 810 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 811 {
 812         struct drm_encoder *encoder = connector->encoder;
 813         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 814         int old_dpms;
 815
 816         if (mode == connector->dpms)
 817                 return;
 818
 819         old_dpms = connector->dpms;
 820         connector->dpms = mode;
 821
 822         /* from off to on, do crtc then encoder */
 823         if (mode < old_dpms) {
 824                 if (crtc) {
 825                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 826                         if (crtc_funcs->dpms)
 827                                 (*crtc_funcs->dpms) (crtc,
 828                                                      drm_helper_choose_crtc_dpms(crtc));
 829                 }
 830                 if (encoder) {
 831                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 832                         if (encoder_funcs->dpms)
 833                                 (*encoder_funcs->dpms) (encoder,
 834                                                         drm_helper_choose_encoder_dpms(encoder));
 835                 }
 836         }
 837
 838         /* from on to off, do encoder then crtc */
 839         if (mode > old_dpms) {
 840                 if (encoder) {
 841                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 842                         if (encoder_funcs->dpms)
 843                                 (*encoder_funcs->dpms) (encoder,
 844                                                         drm_helper_choose_encoder_dpms(encoder));
 845                 }
 846                 if (crtc) {
 847                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 848                         if (crtc_funcs->dpms)
 849                                 (*crtc_funcs->dpms) (crtc,
 850                                                      drm_helper_choose_crtc_dpms(crtc));
 851                 }
 852         }
 853
 854         return;
 855 }
 856 EXPORT_SYMBOL(drm_helper_connector_dpms);
 857
 858 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 859                                    struct drm_mode_fb_cmd2 *mode_cmd)
 860 {
 861         int i;
 862
 863         fb->width = mode_cmd->width;
 864         fb->height = mode_cmd->height;
 865         for (i = 0; i < 4; i++) {
 866                 fb->pitches[i] = mode_cmd->pitches[i];
 867                 fb->offsets[i] = mode_cmd->offsets[i];
 868         }
 869         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 870                                     &fb->bits_per_pixel);
 871         fb->pixel_format = mode_cmd->pixel_format;
 872
 873         return 0;
 874 }
 875 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 876
 877 int drm_helper_resume_force_mode(struct drm_device *dev)
 878 {
 879         struct drm_crtc *crtc;
 880         struct drm_encoder *encoder;
 881         struct drm_encoder_helper_funcs *encoder_funcs;
 882         struct drm_crtc_helper_funcs *crtc_funcs;
 883         int ret;
 884
 885         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 886
 887                 if (!crtc->enabled)
 888                         continue;
 889
 890                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 891                                                crtc->x, crtc->y, crtc->fb);
 892
 893                 if (ret == false)
 894                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 895
 896                 /* Turn off outputs that were already powered off */
 897                 if (drm_helper_choose_crtc_dpms(crtc)) {
 898                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 899
 900                                 if(encoder->crtc != crtc)
 901                                         continue;
 902
 903                                 encoder_funcs = encoder->helper_private;
 904                                 if (encoder_funcs->dpms)
 905                                         (*encoder_funcs->dpms) (encoder,
 906                                                                 drm_helper_choose_encoder_dpms(encoder));
 907                         }
 908
 909                         crtc_funcs = crtc->helper_private;
 910                         if (crtc_funcs->dpms)
 911                                 (*crtc_funcs->dpms) (crtc,
 912                                                      drm_helper_choose_crtc_dpms(crtc));
 913                 }
 914         }
 915         /* disable the unused connectors while restoring the modesetting */
 916         drm_helper_disable_unused_functions(dev);
 917         return 0;
 918 }
 919 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 920
 921 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 922 static void output_poll_execute(struct work_struct *work)
 923 {
 924         struct delayed_work *delayed_work = to_delayed_work(work);
 925         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 926         struct drm_connector *connector;
 927         enum drm_connector_status old_status;
 928         bool repoll = false, changed = false;
 929
 930         if (!drm_kms_helper_poll)
 931                 return;
 932
 933         mutex_lock(&dev->mode_config.mutex);
 934         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 935
 936                 /* if this is HPD or polled don't check it -
 937                    TV out for instance */
 938                 if (!connector->polled)
 939                         continue;
 940
 941                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
 942                         repoll = true;
 943
 944                 old_status = connector->status;
 945                 /* if we are connected and don't want to poll for disconnect
 946                    skip it */
 947                 if (old_status == connector_status_connected &&
 948                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 949                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 950                         continue;
 951
 952                 connector->status = connector->funcs->detect(connector, false);
 953                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 954                               connector->base.id,
 955                               drm_get_connector_name(connector),
 956                               old_status, connector->status);
 957                 if (old_status != connector->status)
 958                         changed = true;
 959         }
 960
 961         mutex_unlock(&dev->mode_config.mutex);
 962
 963         if (changed) {
 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
 970         if (repoll)
 971                 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
 972 }
 973
 974 void drm_kms_helper_poll_disable(struct drm_device *dev)
 975 {
 976         if (!dev->mode_config.poll_enabled)
 977                 return;
 978         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
 979 }
 980 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 981
 982 void drm_kms_helper_poll_enable(struct drm_device *dev)
 983 {
 984         bool poll = false;
 985         struct drm_connector *connector;
 986
 987         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
 988                 return;
 989
 990         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 991                 if (connector->polled)
 992                         poll = true;
 993         }
 994
 995         if (poll)
 996                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
 997 }
 998 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
 999
1000 void drm_kms_helper_poll_init(struct drm_device *dev)
1001 {
1002         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1003         dev->mode_config.poll_enabled = true;
1004
1005         drm_kms_helper_poll_enable(dev);
1006 }
1007 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1008
1009 void drm_kms_helper_poll_fini(struct drm_device *dev)
1010 {
1011         drm_kms_helper_poll_disable(dev);
1012 }
1013 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1014
1015 void drm_helper_hpd_irq_event(struct drm_device *dev)
1016 {
1017         if (!dev->mode_config.poll_enabled)
1018                 return;
1019
1020         /* kill timer and schedule immediate execution, this doesn't block */
1021         cancel_delayed_work(&dev->mode_config.output_poll_work);
1022         if (drm_kms_helper_poll)
1023                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
1024 }
1025 EXPORT_SYMBOL(drm_helper_hpd_irq_event);
1026
1027
1028 /**
1029  * drm_format_num_planes - get the number of planes for format
1030  * @format: pixel format (DRM_FORMAT_*)
1031  *
1032  * RETURNS:
1033  * The number of planes used by the specified pixel format.
1034  */
1035 int drm_format_num_planes(uint32_t format)
1036 {
1037         switch (format) {
1038         case DRM_FORMAT_YUV410:
1039         case DRM_FORMAT_YVU410:
1040         case DRM_FORMAT_YUV411:
1041         case DRM_FORMAT_YVU411:
1042         case DRM_FORMAT_YUV420:
1043         case DRM_FORMAT_YVU420:
1044         case DRM_FORMAT_YUV422:
1045         case DRM_FORMAT_YVU422:
1046         case DRM_FORMAT_YUV444:
1047         case DRM_FORMAT_YVU444:
1048                 return 3;
1049         case DRM_FORMAT_NV12:
1050         case DRM_FORMAT_NV21:
1051         case DRM_FORMAT_NV16:
1052         case DRM_FORMAT_NV61:
1053                 return 2;
1054         default:
1055                 return 1;
1056         }
1057 }
1058 EXPORT_SYMBOL(drm_format_num_planes);