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 /**
 460  * drm_crtc_helper_set_config - set a new config from userspace
 461  * @crtc: CRTC to setup
 462  * @crtc_info: user provided configuration
 463  * @new_mode: new mode to set
 464  * @connector_set: set of connectors for the new config
 465  * @fb: new framebuffer
 466  *
 467  * LOCKING:
 468  * Caller must hold mode config lock.
 469  *
 470  * Setup a new configuration, provided by the user in @crtc_info, and enable
 471  * it.
 472  *
 473  * RETURNS:
 474  * Zero. (FIXME)
 475  */
 476 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 477 {
 478         struct drm_device *dev;
 479         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 480         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 481         struct drm_framebuffer *old_fb = NULL;
 482         bool mode_changed = false; /* if true do a full mode set */
 483         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 484         struct drm_connector *save_connectors, *connector;
 485         int count = 0, ro, fail = 0;
 486         struct drm_crtc_helper_funcs *crtc_funcs;
 487         int ret = 0;
 488         int i;
 489
 490         DRM_DEBUG_KMS("\n");
 491
 492         if (!set)
 493                 return -EINVAL;
 494
 495         if (!set->crtc)
 496                 return -EINVAL;
 497
 498         if (!set->crtc->helper_private)
 499                 return -EINVAL;
 500
 501         crtc_funcs = set->crtc->helper_private;
 502
 503         if (!set->mode)
 504                 set->fb = NULL;
 505
 506         if (set->fb) {
 507                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 508                                 set->crtc->base.id, set->fb->base.id,
 509                                 (int)set->num_connectors, set->x, set->y);
 510         } else {
 511                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 512                 set->mode = NULL;
 513                 set->num_connectors = 0;
 514         }
 515
 516         dev = set->crtc->dev;
 517
 518         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 519          * connector data. */
 520         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 521                              sizeof(struct drm_crtc), GFP_KERNEL);
 522         if (!save_crtcs)
 523                 return -ENOMEM;
 524
 525         save_encoders = kzalloc(dev->mode_config.num_encoder *
 526                                 sizeof(struct drm_encoder), GFP_KERNEL);
 527         if (!save_encoders) {
 528                 kfree(save_crtcs);
 529                 return -ENOMEM;
 530         }
 531
 532         save_connectors = kzalloc(dev->mode_config.num_connector *
 533                                 sizeof(struct drm_connector), GFP_KERNEL);
 534         if (!save_connectors) {
 535                 kfree(save_crtcs);
 536                 kfree(save_encoders);
 537                 return -ENOMEM;
 538         }
 539
 540         /* Copy data. Note that driver private data is not affected.
 541          * Should anything bad happen only the expected state is
 542          * restored, not the drivers personal bookkeeping.
 543          */
 544         count = 0;
 545         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 546                 save_crtcs[count++] = *crtc;
 547         }
 548
 549         count = 0;
 550         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 551                 save_encoders[count++] = *encoder;
 552         }
 553
 554         count = 0;
 555         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 556                 save_connectors[count++] = *connector;
 557         }
 558
 559         /* We should be able to check here if the fb has the same properties
 560          * and then just flip_or_move it */
 561         if (set->crtc->fb != set->fb) {
 562                 /* If we have no fb then treat it as a full mode set */
 563                 if (set->crtc->fb == NULL) {
 564                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 565                         mode_changed = true;
 566                 } else if (set->fb == NULL) {
 567                         mode_changed = true;
 568                 } else if (set->fb->depth != set->crtc->fb->depth) {
 569                         mode_changed = true;
 570                 } else if (set->fb->bits_per_pixel !=
 571                            set->crtc->fb->bits_per_pixel) {
 572                         mode_changed = true;
 573                 } else
 574                         fb_changed = true;
 575         }
 576
 577         if (set->x != set->crtc->x || set->y != set->crtc->y)
 578                 fb_changed = true;
 579
 580         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 581                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 582                 drm_mode_debug_printmodeline(&set->crtc->mode);
 583                 drm_mode_debug_printmodeline(set->mode);
 584                 mode_changed = true;
 585         }
 586
 587         /* a) traverse passed in connector list and get encoders for them */
 588         count = 0;
 589         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 590                 struct drm_connector_helper_funcs *connector_funcs =
 591                         connector->helper_private;
 592                 new_encoder = connector->encoder;
 593                 for (ro = 0; ro < set->num_connectors; ro++) {
 594                         if (set->connectors[ro] == connector) {
 595                                 new_encoder = connector_funcs->best_encoder(connector);
 596                                 /* if we can't get an encoder for a connector
 597                                    we are setting now - then fail */
 598                                 if (new_encoder == NULL)
 599                                         /* don't break so fail path works correct */
 600                                         fail = 1;
 601                                 break;
 602                         }
 603                 }
 604
 605                 if (new_encoder != connector->encoder) {
 606                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 607                         mode_changed = true;
 608                         /* If the encoder is reused for another connector, then
 609                          * the appropriate crtc will be set later.
 610                          */
 611                         if (connector->encoder)
 612                                 connector->encoder->crtc = NULL;
 613                         connector->encoder = new_encoder;
 614                 }
 615         }
 616
 617         if (fail) {
 618                 ret = -EINVAL;
 619                 goto fail;
 620         }
 621
 622         count = 0;
 623         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 624                 if (!connector->encoder)
 625                         continue;
 626
 627                 if (connector->encoder->crtc == set->crtc)
 628                         new_crtc = NULL;
 629                 else
 630                         new_crtc = connector->encoder->crtc;
 631
 632                 for (ro = 0; ro < set->num_connectors; ro++) {
 633                         if (set->connectors[ro] == connector)
 634                                 new_crtc = set->crtc;
 635                 }
 636
 637                 /* Make sure the new CRTC will work with the encoder */
 638                 if (new_crtc &&
 639                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 640                         ret = -EINVAL;
 641                         goto fail;
 642                 }
 643                 if (new_crtc != connector->encoder->crtc) {
 644                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 645                         mode_changed = true;
 646                         connector->encoder->crtc = new_crtc;
 647                 }
 648                 if (new_crtc) {
 649                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 650                                 connector->base.id, drm_get_connector_name(connector),
 651                                 new_crtc->base.id);
 652                 } else {
 653                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 654                                 connector->base.id, drm_get_connector_name(connector));
 655                 }
 656         }
 657
 658         /* mode_set_base is not a required function */
 659         if (fb_changed && !crtc_funcs->mode_set_base)
 660                 mode_changed = true;
 661
 662         if (mode_changed) {
 663                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 664                 if (set->crtc->enabled) {
 665                         DRM_DEBUG_KMS("attempting to set mode from"
 666                                         " userspace\n");
 667                         drm_mode_debug_printmodeline(set->mode);
 668                         old_fb = set->crtc->fb;
 669                         set->crtc->fb = set->fb;
 670                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 671                                                       set->x, set->y,
 672                                                       old_fb)) {
 673                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 674                                           set->crtc->base.id);
 675                                 set->crtc->fb = old_fb;
 676                                 ret = -EINVAL;
 677                                 goto fail;
 678                         }
 679                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 680                         for (i = 0; i < set->num_connectors; i++) {
 681                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 682                                               drm_get_connector_name(set->connectors[i]));
 683                                 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
 684                         }
 685                 }
 686                 drm_helper_disable_unused_functions(dev);
 687         } else if (fb_changed) {
 688                 set->crtc->x = set->x;
 689                 set->crtc->y = set->y;
 690
 691                 old_fb = set->crtc->fb;
 692                 if (set->crtc->fb != set->fb)
 693                         set->crtc->fb = set->fb;
 694                 ret = crtc_funcs->mode_set_base(set->crtc,
 695                                                 set->x, set->y, old_fb);
 696                 if (ret != 0) {
 697                         set->crtc->fb = old_fb;
 698                         goto fail;
 699                 }
 700         }
 701
 702         kfree(save_connectors);
 703         kfree(save_encoders);
 704         kfree(save_crtcs);
 705         return 0;
 706
 707 fail:
 708         /* Restore all previous data. */
 709         count = 0;
 710         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 711                 *crtc = save_crtcs[count++];
 712         }
 713
 714         count = 0;
 715         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 716                 *encoder = save_encoders[count++];
 717         }
 718
 719         count = 0;
 720         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 721                 *connector = save_connectors[count++];
 722         }
 723
 724         kfree(save_connectors);
 725         kfree(save_encoders);
 726         kfree(save_crtcs);
 727         return ret;
 728 }
 729 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 730
 731 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 732 {
 733         int dpms = DRM_MODE_DPMS_OFF;
 734         struct drm_connector *connector;
 735         struct drm_device *dev = encoder->dev;
 736
 737         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 738                 if (connector->encoder == encoder)
 739                         if (connector->dpms < dpms)
 740                                 dpms = connector->dpms;
 741         return dpms;
 742 }
 743
 744 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 745 {
 746         int dpms = DRM_MODE_DPMS_OFF;
 747         struct drm_connector *connector;
 748         struct drm_device *dev = crtc->dev;
 749
 750         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 751                 if (connector->encoder && connector->encoder->crtc == crtc)
 752                         if (connector->dpms < dpms)
 753                                 dpms = connector->dpms;
 754         return dpms;
 755 }
 756
 757 /**
 758  * drm_helper_connector_dpms
 759  * @connector affected connector
 760  * @mode DPMS mode
 761  *
 762  * Calls the low-level connector DPMS function, then
 763  * calls appropriate encoder and crtc DPMS functions as well
 764  */
 765 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 766 {
 767         struct drm_encoder *encoder = connector->encoder;
 768         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 769         int old_dpms;
 770
 771         if (mode == connector->dpms)
 772                 return;
 773
 774         old_dpms = connector->dpms;
 775         connector->dpms = mode;
 776
 777         /* from off to on, do crtc then encoder */
 778         if (mode < old_dpms) {
 779                 if (crtc) {
 780                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 781                         if (crtc_funcs->dpms)
 782                                 (*crtc_funcs->dpms) (crtc,
 783                                                      drm_helper_choose_crtc_dpms(crtc));
 784                 }
 785                 if (encoder) {
 786                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 787                         if (encoder_funcs->dpms)
 788                                 (*encoder_funcs->dpms) (encoder,
 789                                                         drm_helper_choose_encoder_dpms(encoder));
 790                 }
 791         }
 792
 793         /* from on to off, do encoder then crtc */
 794         if (mode > old_dpms) {
 795                 if (encoder) {
 796                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 797                         if (encoder_funcs->dpms)
 798                                 (*encoder_funcs->dpms) (encoder,
 799                                                         drm_helper_choose_encoder_dpms(encoder));
 800                 }
 801                 if (crtc) {
 802                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 803                         if (crtc_funcs->dpms)
 804                                 (*crtc_funcs->dpms) (crtc,
 805                                                      drm_helper_choose_crtc_dpms(crtc));
 806                 }
 807         }
 808
 809         return;
 810 }
 811 EXPORT_SYMBOL(drm_helper_connector_dpms);
 812
 813 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 814                                    struct drm_mode_fb_cmd *mode_cmd)
 815 {
 816         fb->width = mode_cmd->width;
 817         fb->height = mode_cmd->height;
 818         fb->pitch = mode_cmd->pitch;
 819         fb->bits_per_pixel = mode_cmd->bpp;
 820         fb->depth = mode_cmd->depth;
 821
 822         return 0;
 823 }
 824 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 825
 826 int drm_helper_resume_force_mode(struct drm_device *dev)
 827 {
 828         struct drm_crtc *crtc;
 829         struct drm_encoder *encoder;
 830         struct drm_encoder_helper_funcs *encoder_funcs;
 831         struct drm_crtc_helper_funcs *crtc_funcs;
 832         int ret;
 833
 834         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 835
 836                 if (!crtc->enabled)
 837                         continue;
 838
 839                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 840                                                crtc->x, crtc->y, crtc->fb);
 841
 842                 if (ret == false)
 843                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 844
 845                 /* Turn off outputs that were already powered off */
 846                 if (drm_helper_choose_crtc_dpms(crtc)) {
 847                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 848
 849                                 if(encoder->crtc != crtc)
 850                                         continue;
 851
 852                                 encoder_funcs = encoder->helper_private;
 853                                 if (encoder_funcs->dpms)
 854                                         (*encoder_funcs->dpms) (encoder,
 855                                                                 drm_helper_choose_encoder_dpms(encoder));
 856                         }
 857
 858                         crtc_funcs = crtc->helper_private;
 859                         if (crtc_funcs->dpms)
 860                                 (*crtc_funcs->dpms) (crtc,
 861                                                      drm_helper_choose_crtc_dpms(crtc));
 862                 }
 863         }
 864         /* disable the unused connectors while restoring the modesetting */
 865         drm_helper_disable_unused_functions(dev);
 866         return 0;
 867 }
 868 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 869
 870 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 871 static void output_poll_execute(struct work_struct *work)
 872 {
 873         struct delayed_work *delayed_work = to_delayed_work(work);
 874         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 875         struct drm_connector *connector;
 876         enum drm_connector_status old_status;
 877         bool repoll = false, changed = false;
 878
 879         if (!drm_kms_helper_poll)
 880                 return;
 881
 882         mutex_lock(&dev->mode_config.mutex);
 883         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 884
 885                 /* if this is HPD or polled don't check it -
 886                    TV out for instance */
 887                 if (!connector->polled)
 888                         continue;
 889
 890                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
 891                         repoll = true;
 892
 893                 old_status = connector->status;
 894                 /* if we are connected and don't want to poll for disconnect
 895                    skip it */
 896                 if (old_status == connector_status_connected &&
 897                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 898                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 899                         continue;
 900
 901                 connector->status = connector->funcs->detect(connector, false);
 902                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 903                               connector->base.id,
 904                               drm_get_connector_name(connector),
 905                               old_status, connector->status);
 906                 if (old_status != connector->status)
 907                         changed = true;
 908         }
 909
 910         mutex_unlock(&dev->mode_config.mutex);
 911
 912         if (changed) {
 913                 /* send a uevent + call fbdev */
 914                 drm_sysfs_hotplug_event(dev);
 915                 if (dev->mode_config.funcs->output_poll_changed)
 916                         dev->mode_config.funcs->output_poll_changed(dev);
 917         }
 918
 919         if (repoll)
 920                 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
 921 }
 922
 923 void drm_kms_helper_poll_disable(struct drm_device *dev)
 924 {
 925         if (!dev->mode_config.poll_enabled)
 926                 return;
 927         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
 928 }
 929 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
 930
 931 void drm_kms_helper_poll_enable(struct drm_device *dev)
 932 {
 933         bool poll = false;
 934         struct drm_connector *connector;
 935
 936         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
 937                 return;
 938
 939         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 940                 if (connector->polled)
 941                         poll = true;
 942         }
 943
 944         if (poll)
 945                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
 946 }
 947 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
 948
 949 void drm_kms_helper_poll_init(struct drm_device *dev)
 950 {
 951         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
 952         dev->mode_config.poll_enabled = true;
 953
 954         drm_kms_helper_poll_enable(dev);
 955 }
 956 EXPORT_SYMBOL(drm_kms_helper_poll_init);
 957
 958 void drm_kms_helper_poll_fini(struct drm_device *dev)
 959 {
 960         drm_kms_helper_poll_disable(dev);
 961 }
 962 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
 963
 964 void drm_helper_hpd_irq_event(struct drm_device *dev)
 965 {
 966         if (!dev->mode_config.poll_enabled)
 967                 return;
 968
 969         /* kill timer and schedule immediate execution, this doesn't block */
 970         cancel_delayed_work(&dev->mode_config.output_poll_work);
 971         if (drm_kms_helper_poll)
 972                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
 973 }
 974 EXPORT_SYMBOL(drm_helper_hpd_irq_event);