drivers/gpu/drm/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  *
   5  * DRM core CRTC related functions
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that copyright
  10  * notice and this permission notice appear in supporting documentation, and
  11  * that the name of the copyright holders not be used in advertising or
  12  * publicity pertaining to distribution of the software without specific,
  13  * written prior permission.  The copyright holders make no representations
  14  * about the suitability of this software for any purpose.  It is provided "as
  15  * is" without express or implied warranty.
  16  *
  17  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23  * OF THIS SOFTWARE.
  24  *
  25  * Authors:
  26  *      Keith Packard
  27  *      Eric Anholt <eric@anholt.net>
  28  *      Dave Airlie <airlied@linux.ie>
  29  *      Jesse Barnes <jesse.barnes@intel.com>
  30  */
  31
  32 #include <linux/export.h>
  33 #include <linux/moduleparam.h>
  34
  35 #include <drm/drmP.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_fourcc.h>
  38 #include <drm/drm_crtc_helper.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_edid.h>
  41
  42 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  43 MODULE_DESCRIPTION("DRM KMS helper");
  44 MODULE_LICENSE("GPL and additional rights");
  45
  46 /**
  47  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  48  *                                              connector list
  49  * @dev: drm device to operate on
  50  *
  51  * Some userspace presumes that the first connected connector is the main
  52  * display, where it's supposed to display e.g. the login screen. For
  53  * laptops, this should be the main panel. Use this function to sort all
  54  * (eDP/LVDS) panels to the front of the connector list, instead of
  55  * painstakingly trying to initialize them in the right order.
  56  */
  57 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  58 {
  59         struct drm_connector *connector, *tmp;
  60         struct list_head panel_list;
  61
  62         INIT_LIST_HEAD(&panel_list);
  63
  64         list_for_each_entry_safe(connector, tmp,
  65                                  &dev->mode_config.connector_list, head) {
  66                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  67                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  68                         list_move_tail(&connector->head, &panel_list);
  69         }
  70
  71         list_splice(&panel_list, &dev->mode_config.connector_list);
  72 }
  73 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  74
  75 static bool drm_kms_helper_poll = true;
  76 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  77
  78 static void drm_mode_validate_flag(struct drm_connector *connector,
  79                                    int flags)
  80 {
  81         struct drm_display_mode *mode;
  82
  83         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
  84                       DRM_MODE_FLAG_3D_MASK))
  85                 return;
  86
  87         list_for_each_entry(mode, &connector->modes, head) {
  88                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  89                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  90                         mode->status = MODE_NO_INTERLACE;
  91                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  92                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  93                         mode->status = MODE_NO_DBLESCAN;
  94                 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
  95                                 !(flags & DRM_MODE_FLAG_3D_MASK))
  96                         mode->status = MODE_NO_STEREO;
  97         }
  98
  99         return;
 100 }
 101
 102 /**
 103  * drm_helper_probe_single_connector_modes - get complete set of display modes
 104  * @connector: connector to probe
 105  * @maxX: max width for modes
 106  * @maxY: max height for modes
 107  *
 108  * LOCKING:
 109  * Caller must hold mode config lock.
 110  *
 111  * Based on the helper callbacks implemented by @connector try to detect all
 112  * valid modes.  Modes will first be added to the connector's probed_modes list,
 113  * then culled (based on validity and the @maxX, @maxY parameters) and put into
 114  * the normal modes list.
 115  *
 116  * Intended to be use as a generic implementation of the ->fill_modes()
 117  * @connector vfunc for drivers that use the crtc helpers for output mode
 118  * filtering and detection.
 119  *
 120  * RETURNS:
 121  * Number of modes found on @connector.
 122  */
 123 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 124                                             uint32_t maxX, uint32_t maxY)
 125 {
 126         struct drm_device *dev = connector->dev;
 127         struct drm_display_mode *mode;
 128         struct drm_connector_helper_funcs *connector_funcs =
 129                 connector->helper_private;
 130         int count = 0;
 131         int mode_flags = 0;
 132         bool verbose_prune = true;
 133
 134         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 135                         drm_get_connector_name(connector));
 136         /* set all modes to the unverified state */
 137         list_for_each_entry(mode, &connector->modes, head)
 138                 mode->status = MODE_UNVERIFIED;
 139
 140         if (connector->force) {
 141                 if (connector->force == DRM_FORCE_ON)
 142                         connector->status = connector_status_connected;
 143                 else
 144                         connector->status = connector_status_disconnected;
 145                 if (connector->funcs->force)
 146                         connector->funcs->force(connector);
 147         } else {
 148                 connector->status = connector->funcs->detect(connector, true);
 149         }
 150
 151         /* Re-enable polling in case the global poll config changed. */
 152         if (drm_kms_helper_poll != dev->mode_config.poll_running)
 153                 drm_kms_helper_poll_enable(dev);
 154
 155         dev->mode_config.poll_running = drm_kms_helper_poll;
 156
 157         if (connector->status == connector_status_disconnected) {
 158                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 159                         connector->base.id, drm_get_connector_name(connector));
 160                 drm_mode_connector_update_edid_property(connector, NULL);
 161                 verbose_prune = false;
 162                 goto prune;
 163         }
 164
 165 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 166         count = drm_load_edid_firmware(connector);
 167         if (count == 0)
 168 #endif
 169                 count = (*connector_funcs->get_modes)(connector);
 170
 171         if (count == 0 && connector->status == connector_status_connected)
 172                 count = drm_add_modes_noedid(connector, 1024, 768);
 173         if (count == 0)
 174                 goto prune;
 175
 176         drm_mode_connector_list_update(connector);
 177
 178         if (maxX && maxY)
 179                 drm_mode_validate_size(dev, &connector->modes, maxX, maxY);
 180
 181         if (connector->interlace_allowed)
 182                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 183         if (connector->doublescan_allowed)
 184                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 185         if (connector->stereo_allowed)
 186                 mode_flags |= DRM_MODE_FLAG_3D_MASK;
 187         drm_mode_validate_flag(connector, mode_flags);
 188
 189         list_for_each_entry(mode, &connector->modes, head) {
 190                 if (mode->status == MODE_OK)
 191                         mode->status = connector_funcs->mode_valid(connector,
 192                                                                    mode);
 193         }
 194
 195 prune:
 196         drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
 197
 198         if (list_empty(&connector->modes))
 199                 return 0;
 200
 201         list_for_each_entry(mode, &connector->modes, head)
 202                 mode->vrefresh = drm_mode_vrefresh(mode);
 203
 204         drm_mode_sort(&connector->modes);
 205
 206         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 207                         drm_get_connector_name(connector));
 208         list_for_each_entry(mode, &connector->modes, head) {
 209                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 210                 drm_mode_debug_printmodeline(mode);
 211         }
 212
 213         return count;
 214 }
 215 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 216
 217 /**
 218  * drm_helper_encoder_in_use - check if a given encoder is in use
 219  * @encoder: encoder to check
 220  *
 221  * LOCKING:
 222  * Caller must hold mode config lock.
 223  *
 224  * Walk @encoders's DRM device's mode_config and see if it's in use.
 225  *
 226  * RETURNS:
 227  * True if @encoder is part of the mode_config, false otherwise.
 228  */
 229 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 230 {
 231         struct drm_connector *connector;
 232         struct drm_device *dev = encoder->dev;
 233         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 234                 if (connector->encoder == encoder)
 235                         return true;
 236         return false;
 237 }
 238 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 239
 240 /**
 241  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 242  * @crtc: CRTC to check
 243  *
 244  * LOCKING:
 245  * Caller must hold mode config lock.
 246  *
 247  * Walk @crtc's DRM device's mode_config and see if it's in use.
 248  *
 249  * RETURNS:
 250  * True if @crtc is part of the mode_config, false otherwise.
 251  */
 252 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 253 {
 254         struct drm_encoder *encoder;
 255         struct drm_device *dev = crtc->dev;
 256         /* FIXME: Locking around list access? */
 257         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 258                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 259                         return true;
 260         return false;
 261 }
 262 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 263
 264 static void
 265 drm_encoder_disable(struct drm_encoder *encoder)
 266 {
 267         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 268
 269         if (encoder->bridge)
 270                 encoder->bridge->funcs->disable(encoder->bridge);
 271
 272         if (encoder_funcs->disable)
 273                 (*encoder_funcs->disable)(encoder);
 274         else
 275                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 276
 277         if (encoder->bridge)
 278                 encoder->bridge->funcs->post_disable(encoder->bridge);
 279 }
 280
 281 /**
 282  * drm_helper_disable_unused_functions - disable unused objects
 283  * @dev: DRM device
 284  *
 285  * LOCKING:
 286  * Caller must hold mode config lock.
 287  *
 288  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 289  * by calling its dpms function, which should power it off.
 290  */
 291 void drm_helper_disable_unused_functions(struct drm_device *dev)
 292 {
 293         struct drm_encoder *encoder;
 294         struct drm_connector *connector;
 295         struct drm_crtc *crtc;
 296
 297         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 298                 if (!connector->encoder)
 299                         continue;
 300                 if (connector->status == connector_status_disconnected)
 301                         connector->encoder = NULL;
 302         }
 303
 304         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 305                 if (!drm_helper_encoder_in_use(encoder)) {
 306                         drm_encoder_disable(encoder);
 307                         /* disconnector encoder from any connector */
 308                         encoder->crtc = NULL;
 309                 }
 310         }
 311
 312         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 313                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 314                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 315                 if (!crtc->enabled) {
 316                         if (crtc_funcs->disable)
 317                                 (*crtc_funcs->disable)(crtc);
 318                         else
 319                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 320                         crtc->fb = NULL;
 321                 }
 322         }
 323 }
 324 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 325
 326 /*
 327  * Check the CRTC we're going to map each output to vs. its current
 328  * CRTC.  If they don't match, we have to disable the output and the CRTC
 329  * since the driver will have to re-route things.
 330  */
 331 static void
 332 drm_crtc_prepare_encoders(struct drm_device *dev)
 333 {
 334         struct drm_encoder_helper_funcs *encoder_funcs;
 335         struct drm_encoder *encoder;
 336
 337         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 338                 encoder_funcs = encoder->helper_private;
 339                 /* Disable unused encoders */
 340                 if (encoder->crtc == NULL)
 341                         drm_encoder_disable(encoder);
 342                 /* Disable encoders whose CRTC is about to change */
 343                 if (encoder_funcs->get_crtc &&
 344                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 345                         drm_encoder_disable(encoder);
 346         }
 347 }
 348
 349 /**
 350  * drm_crtc_helper_set_mode - internal helper to set a mode
 351  * @crtc: CRTC to program
 352  * @mode: mode to use
 353  * @x: horizontal offset into the surface
 354  * @y: vertical offset into the surface
 355  * @old_fb: old framebuffer, for cleanup
 356  *
 357  * LOCKING:
 358  * Caller must hold mode config lock.
 359  *
 360  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 361  * to fixup or reject the mode prior to trying to set it. This is an internal
 362  * helper that drivers could e.g. use to update properties that require the
 363  * entire output pipe to be disabled and re-enabled in a new configuration. For
 364  * example for changing whether audio is enabled on a hdmi link or for changing
 365  * panel fitter or dither attributes. It is also called by the
 366  * drm_crtc_helper_set_config() helper function to drive the mode setting
 367  * sequence.
 368  *
 369  * RETURNS:
 370  * True if the mode was set successfully, or false otherwise.
 371  */
 372 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 373                               struct drm_display_mode *mode,
 374                               int x, int y,
 375                               struct drm_framebuffer *old_fb)
 376 {
 377         struct drm_device *dev = crtc->dev;
 378         struct drm_display_mode *adjusted_mode, saved_mode;
 379         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 380         struct drm_encoder_helper_funcs *encoder_funcs;
 381         int saved_x, saved_y;
 382         bool saved_enabled;
 383         struct drm_encoder *encoder;
 384         bool ret = true;
 385
 386         saved_enabled = crtc->enabled;
 387         crtc->enabled = drm_helper_crtc_in_use(crtc);
 388         if (!crtc->enabled)
 389                 return true;
 390
 391         adjusted_mode = drm_mode_duplicate(dev, mode);
 392         if (!adjusted_mode) {
 393                 crtc->enabled = saved_enabled;
 394                 return false;
 395         }
 396
 397         saved_mode = crtc->mode;
 398         saved_x = crtc->x;
 399         saved_y = crtc->y;
 400
 401         /* Update crtc values up front so the driver can rely on them for mode
 402          * setting.
 403          */
 404         crtc->mode = *mode;
 405         crtc->x = x;
 406         crtc->y = y;
 407
 408         /* Pass our mode to the connectors and the CRTC to give them a chance to
 409          * adjust it according to limitations or connector properties, and also
 410          * a chance to reject the mode entirely.
 411          */
 412         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 413
 414                 if (encoder->crtc != crtc)
 415                         continue;
 416
 417                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 418                         ret = encoder->bridge->funcs->mode_fixup(
 419                                         encoder->bridge, mode, adjusted_mode);
 420                         if (!ret) {
 421                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 422                                 goto done;
 423                         }
 424                 }
 425
 426                 encoder_funcs = encoder->helper_private;
 427                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 428                                                       adjusted_mode))) {
 429                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 430                         goto done;
 431                 }
 432         }
 433
 434         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 435                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 436                 goto done;
 437         }
 438         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 439
 440         /* Prepare the encoders and CRTCs before setting the mode. */
 441         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 442
 443                 if (encoder->crtc != crtc)
 444                         continue;
 445
 446                 if (encoder->bridge)
 447                         encoder->bridge->funcs->disable(encoder->bridge);
 448
 449                 encoder_funcs = encoder->helper_private;
 450                 /* Disable the encoders as the first thing we do. */
 451                 encoder_funcs->prepare(encoder);
 452
 453                 if (encoder->bridge)
 454                         encoder->bridge->funcs->post_disable(encoder->bridge);
 455         }
 456
 457         drm_crtc_prepare_encoders(dev);
 458
 459         crtc_funcs->prepare(crtc);
 460
 461         /* Set up the DPLL and any encoders state that needs to adjust or depend
 462          * on the DPLL.
 463          */
 464         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 465         if (!ret)
 466             goto done;
 467
 468         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 469
 470                 if (encoder->crtc != crtc)
 471                         continue;
 472
 473                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 474                         encoder->base.id, drm_get_encoder_name(encoder),
 475                         mode->base.id, mode->name);
 476                 encoder_funcs = encoder->helper_private;
 477                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 478
 479                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 480                         encoder->bridge->funcs->mode_set(encoder->bridge, mode,
 481                                         adjusted_mode);
 482         }
 483
 484         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 485         crtc_funcs->commit(crtc);
 486
 487         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 488
 489                 if (encoder->crtc != crtc)
 490                         continue;
 491
 492                 if (encoder->bridge)
 493                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 494
 495                 encoder_funcs = encoder->helper_private;
 496                 encoder_funcs->commit(encoder);
 497
 498                 if (encoder->bridge)
 499                         encoder->bridge->funcs->enable(encoder->bridge);
 500         }
 501
 502         /* Store real post-adjustment hardware mode. */
 503         crtc->hwmode = *adjusted_mode;
 504
 505         /* Calculate and store various constants which
 506          * are later needed by vblank and swap-completion
 507          * timestamping. They are derived from true hwmode.
 508          */
 509         drm_calc_timestamping_constants(crtc, &crtc->hwmode);
 510
 511         /* FIXME: add subpixel order */
 512 done:
 513         drm_mode_destroy(dev, adjusted_mode);
 514         if (!ret) {
 515                 crtc->enabled = saved_enabled;
 516                 crtc->mode = saved_mode;
 517                 crtc->x = saved_x;
 518                 crtc->y = saved_y;
 519         }
 520
 521         return ret;
 522 }
 523 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 524
 525
 526 static int
 527 drm_crtc_helper_disable(struct drm_crtc *crtc)
 528 {
 529         struct drm_device *dev = crtc->dev;
 530         struct drm_connector *connector;
 531         struct drm_encoder *encoder;
 532
 533         /* Decouple all encoders and their attached connectors from this crtc */
 534         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 535                 if (encoder->crtc != crtc)
 536                         continue;
 537
 538                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 539                         if (connector->encoder != encoder)
 540                                 continue;
 541
 542                         connector->encoder = NULL;
 543
 544                         /*
 545                          * drm_helper_disable_unused_functions() ought to be
 546                          * doing this, but since we've decoupled the encoder
 547                          * from the connector above, the required connection
 548                          * between them is henceforth no longer available.
 549                          */
 550                         connector->dpms = DRM_MODE_DPMS_OFF;
 551                 }
 552         }
 553
 554         drm_helper_disable_unused_functions(dev);
 555         return 0;
 556 }
 557
 558 /**
 559  * drm_crtc_helper_set_config - set a new config from userspace
 560  * @set: mode set configuration
 561  *
 562  * LOCKING:
 563  * Caller must hold mode config lock.
 564  *
 565  * Setup a new configuration, provided by the upper layers (either an ioctl call
 566  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 567  * enable it. This is the main helper functions for drivers that implement
 568  * kernel mode setting with the crtc helper functions and the assorted
 569  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 570  *
 571  * RETURNS:
 572  * Returns 0 on success, -ERRNO on failure.
 573  */
 574 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 575 {
 576         struct drm_device *dev;
 577         struct drm_crtc *new_crtc;
 578         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 579         bool mode_changed = false; /* if true do a full mode set */
 580         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 581         struct drm_connector *save_connectors, *connector;
 582         int count = 0, ro, fail = 0;
 583         struct drm_crtc_helper_funcs *crtc_funcs;
 584         struct drm_mode_set save_set;
 585         int ret;
 586         int i;
 587
 588         DRM_DEBUG_KMS("\n");
 589
 590         BUG_ON(!set);
 591         BUG_ON(!set->crtc);
 592         BUG_ON(!set->crtc->helper_private);
 593
 594         /* Enforce sane interface api - has been abused by the fb helper. */
 595         BUG_ON(!set->mode && set->fb);
 596         BUG_ON(set->fb && set->num_connectors == 0);
 597
 598         crtc_funcs = set->crtc->helper_private;
 599
 600         if (!set->mode)
 601                 set->fb = NULL;
 602
 603         if (set->fb) {
 604                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 605                                 set->crtc->base.id, set->fb->base.id,
 606                                 (int)set->num_connectors, set->x, set->y);
 607         } else {
 608                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 609                 return drm_crtc_helper_disable(set->crtc);
 610         }
 611
 612         dev = set->crtc->dev;
 613
 614         /*
 615          * Allocate space for the backup of all (non-pointer) encoder and
 616          * connector data.
 617          */
 618         save_encoders = kzalloc(dev->mode_config.num_encoder *
 619                                 sizeof(struct drm_encoder), GFP_KERNEL);
 620         if (!save_encoders)
 621                 return -ENOMEM;
 622
 623         save_connectors = kzalloc(dev->mode_config.num_connector *
 624                                 sizeof(struct drm_connector), GFP_KERNEL);
 625         if (!save_connectors) {
 626                 kfree(save_encoders);
 627                 return -ENOMEM;
 628         }
 629
 630         /*
 631          * Copy data. Note that driver private data is not affected.
 632          * Should anything bad happen only the expected state is
 633          * restored, not the drivers personal bookkeeping.
 634          */
 635         count = 0;
 636         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 637                 save_encoders[count++] = *encoder;
 638         }
 639
 640         count = 0;
 641         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 642                 save_connectors[count++] = *connector;
 643         }
 644
 645         save_set.crtc = set->crtc;
 646         save_set.mode = &set->crtc->mode;
 647         save_set.x = set->crtc->x;
 648         save_set.y = set->crtc->y;
 649         save_set.fb = set->crtc->fb;
 650
 651         /* We should be able to check here if the fb has the same properties
 652          * and then just flip_or_move it */
 653         if (set->crtc->fb != set->fb) {
 654                 /* If we have no fb then treat it as a full mode set */
 655                 if (set->crtc->fb == NULL) {
 656                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 657                         mode_changed = true;
 658                 } else if (set->fb == NULL) {
 659                         mode_changed = true;
 660                 } else if (set->fb->pixel_format !=
 661                            set->crtc->fb->pixel_format) {
 662                         mode_changed = true;
 663                 } else
 664                         fb_changed = true;
 665         }
 666
 667         if (set->x != set->crtc->x || set->y != set->crtc->y)
 668                 fb_changed = true;
 669
 670         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 671                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 672                 drm_mode_debug_printmodeline(&set->crtc->mode);
 673                 drm_mode_debug_printmodeline(set->mode);
 674                 mode_changed = true;
 675         }
 676
 677         /* a) traverse passed in connector list and get encoders for them */
 678         count = 0;
 679         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 680                 struct drm_connector_helper_funcs *connector_funcs =
 681                         connector->helper_private;
 682                 new_encoder = connector->encoder;
 683                 for (ro = 0; ro < set->num_connectors; ro++) {
 684                         if (set->connectors[ro] == connector) {
 685                                 new_encoder = connector_funcs->best_encoder(connector);
 686                                 /* if we can't get an encoder for a connector
 687                                    we are setting now - then fail */
 688                                 if (new_encoder == NULL)
 689                                         /* don't break so fail path works correct */
 690                                         fail = 1;
 691                                 break;
 692
 693                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 694                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 695                                         mode_changed = true;
 696                                 }
 697                         }
 698                 }
 699
 700                 if (new_encoder != connector->encoder) {
 701                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 702                         mode_changed = true;
 703                         /* If the encoder is reused for another connector, then
 704                          * the appropriate crtc will be set later.
 705                          */
 706                         if (connector->encoder)
 707                                 connector->encoder->crtc = NULL;
 708                         connector->encoder = new_encoder;
 709                 }
 710         }
 711
 712         if (fail) {
 713                 ret = -EINVAL;
 714                 goto fail;
 715         }
 716
 717         count = 0;
 718         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 719                 if (!connector->encoder)
 720                         continue;
 721
 722                 if (connector->encoder->crtc == set->crtc)
 723                         new_crtc = NULL;
 724                 else
 725                         new_crtc = connector->encoder->crtc;
 726
 727                 for (ro = 0; ro < set->num_connectors; ro++) {
 728                         if (set->connectors[ro] == connector)
 729                                 new_crtc = set->crtc;
 730                 }
 731
 732                 /* Make sure the new CRTC will work with the encoder */
 733                 if (new_crtc &&
 734                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 735                         ret = -EINVAL;
 736                         goto fail;
 737                 }
 738                 if (new_crtc != connector->encoder->crtc) {
 739                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 740                         mode_changed = true;
 741                         connector->encoder->crtc = new_crtc;
 742                 }
 743                 if (new_crtc) {
 744                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 745                                 connector->base.id, drm_get_connector_name(connector),
 746                                 new_crtc->base.id);
 747                 } else {
 748                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 749                                 connector->base.id, drm_get_connector_name(connector));
 750                 }
 751         }
 752
 753         /* mode_set_base is not a required function */
 754         if (fb_changed && !crtc_funcs->mode_set_base)
 755                 mode_changed = true;
 756
 757         if (mode_changed) {
 758                 if (drm_helper_crtc_in_use(set->crtc)) {
 759                         DRM_DEBUG_KMS("attempting to set mode from"
 760                                         " userspace\n");
 761                         drm_mode_debug_printmodeline(set->mode);
 762                         set->crtc->fb = set->fb;
 763                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 764                                                       set->x, set->y,
 765                                                       save_set.fb)) {
 766                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 767                                           set->crtc->base.id);
 768                                 set->crtc->fb = save_set.fb;
 769                                 ret = -EINVAL;
 770                                 goto fail;
 771                         }
 772                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 773                         for (i = 0; i < set->num_connectors; i++) {
 774                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 775                                               drm_get_connector_name(set->connectors[i]));
 776                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 777                         }
 778                 }
 779                 drm_helper_disable_unused_functions(dev);
 780         } else if (fb_changed) {
 781                 set->crtc->x = set->x;
 782                 set->crtc->y = set->y;
 783                 set->crtc->fb = set->fb;
 784                 ret = crtc_funcs->mode_set_base(set->crtc,
 785                                                 set->x, set->y, save_set.fb);
 786                 if (ret != 0) {
 787                         set->crtc->x = save_set.x;
 788                         set->crtc->y = save_set.y;
 789                         set->crtc->fb = save_set.fb;
 790                         goto fail;
 791                 }
 792         }
 793
 794         kfree(save_connectors);
 795         kfree(save_encoders);
 796         return 0;
 797
 798 fail:
 799         /* Restore all previous data. */
 800         count = 0;
 801         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 802                 *encoder = save_encoders[count++];
 803         }
 804
 805         count = 0;
 806         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 807                 *connector = save_connectors[count++];
 808         }
 809
 810         /* Try to restore the config */
 811         if (mode_changed &&
 812             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 813                                       save_set.y, save_set.fb))
 814                 DRM_ERROR("failed to restore config after modeset failure\n");
 815
 816         kfree(save_connectors);
 817         kfree(save_encoders);
 818         return ret;
 819 }
 820 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 821
 822 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 823 {
 824         int dpms = DRM_MODE_DPMS_OFF;
 825         struct drm_connector *connector;
 826         struct drm_device *dev = encoder->dev;
 827
 828         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 829                 if (connector->encoder == encoder)
 830                         if (connector->dpms < dpms)
 831                                 dpms = connector->dpms;
 832         return dpms;
 833 }
 834
 835 /* Helper which handles bridge ordering around encoder dpms */
 836 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 837 {
 838         struct drm_bridge *bridge = encoder->bridge;
 839         struct drm_encoder_helper_funcs *encoder_funcs;
 840
 841         if (bridge) {
 842                 if (mode == DRM_MODE_DPMS_ON)
 843                         bridge->funcs->pre_enable(bridge);
 844                 else
 845                         bridge->funcs->disable(bridge);
 846         }
 847
 848         encoder_funcs = encoder->helper_private;
 849         if (encoder_funcs->dpms)
 850                 encoder_funcs->dpms(encoder, mode);
 851
 852         if (bridge) {
 853                 if (mode == DRM_MODE_DPMS_ON)
 854                         bridge->funcs->enable(bridge);
 855                 else
 856                         bridge->funcs->post_disable(bridge);
 857         }
 858 }
 859
 860 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 861 {
 862         int dpms = DRM_MODE_DPMS_OFF;
 863         struct drm_connector *connector;
 864         struct drm_device *dev = crtc->dev;
 865
 866         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 867                 if (connector->encoder && connector->encoder->crtc == crtc)
 868                         if (connector->dpms < dpms)
 869                                 dpms = connector->dpms;
 870         return dpms;
 871 }
 872
 873 /**
 874  * drm_helper_connector_dpms() - connector dpms helper implementation
 875  * @connector: affected connector
 876  * @mode: DPMS mode
 877  *
 878  * This is the main helper function provided by the crtc helper framework for
 879  * implementing the DPMS connector attribute. It computes the new desired DPMS
 880  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 881  * callback provided by the driver appropriately.
 882  */
 883 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 884 {
 885         struct drm_encoder *encoder = connector->encoder;
 886         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 887         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 888
 889         if (mode == connector->dpms)
 890                 return;
 891
 892         old_dpms = connector->dpms;
 893         connector->dpms = mode;
 894
 895         if (encoder)
 896                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 897
 898         /* from off to on, do crtc then encoder */
 899         if (mode < old_dpms) {
 900                 if (crtc) {
 901                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 902                         if (crtc_funcs->dpms)
 903                                 (*crtc_funcs->dpms) (crtc,
 904                                                      drm_helper_choose_crtc_dpms(crtc));
 905                 }
 906                 if (encoder)
 907                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 908         }
 909
 910         /* from on to off, do encoder then crtc */
 911         if (mode > old_dpms) {
 912                 if (encoder)
 913                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 914                 if (crtc) {
 915                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 916                         if (crtc_funcs->dpms)
 917                                 (*crtc_funcs->dpms) (crtc,
 918                                                      drm_helper_choose_crtc_dpms(crtc));
 919                 }
 920         }
 921
 922         return;
 923 }
 924 EXPORT_SYMBOL(drm_helper_connector_dpms);
 925
 926 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 927                                     struct drm_mode_fb_cmd2 *mode_cmd)
 928 {
 929         int i;
 930
 931         fb->width = mode_cmd->width;
 932         fb->height = mode_cmd->height;
 933         for (i = 0; i < 4; i++) {
 934                 fb->pitches[i] = mode_cmd->pitches[i];
 935                 fb->offsets[i] = mode_cmd->offsets[i];
 936         }
 937         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 938                                     &fb->bits_per_pixel);
 939         fb->pixel_format = mode_cmd->pixel_format;
 940 }
 941 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 942
 943 /**
 944  * drm_helper_resume_force_mode - force-restore mode setting configuration
 945  * @dev: drm_device which should be restored
 946  *
 947  * Drivers which use the mode setting helpers can use this function to
 948  * force-restore the mode setting configuration e.g. on resume or when something
 949  * else might have trampled over the hw state (like some overzealous old BIOSen
 950  * tended to do).
 951  */
 952 int drm_helper_resume_force_mode(struct drm_device *dev)
 953 {
 954         struct drm_crtc *crtc;
 955         struct drm_encoder *encoder;
 956         struct drm_crtc_helper_funcs *crtc_funcs;
 957         int ret, encoder_dpms;
 958
 959         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 960
 961                 if (!crtc->enabled)
 962                         continue;
 963
 964                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 965                                                crtc->x, crtc->y, crtc->fb);
 966
 967                 if (ret == false)
 968                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 969
 970                 /* Turn off outputs that were already powered off */
 971                 if (drm_helper_choose_crtc_dpms(crtc)) {
 972                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 973
 974                                 if(encoder->crtc != crtc)
 975                                         continue;
 976
 977                                 encoder_dpms = drm_helper_choose_encoder_dpms(
 978                                                         encoder);
 979
 980                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
 981                         }
 982
 983                         crtc_funcs = crtc->helper_private;
 984                         if (crtc_funcs->dpms)
 985                                 (*crtc_funcs->dpms) (crtc,
 986                                                      drm_helper_choose_crtc_dpms(crtc));
 987                 }
 988         }
 989         /* disable the unused connectors while restoring the modesetting */
 990         drm_helper_disable_unused_functions(dev);
 991         return 0;
 992 }
 993 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 994
 995 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 996 {
 997         /* send a uevent + call fbdev */
 998         drm_sysfs_hotplug_event(dev);
 999         if (dev->mode_config.funcs->output_poll_changed)
1000                 dev->mode_config.funcs->output_poll_changed(dev);
1001 }
1002 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1003
1004 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1005 static void output_poll_execute(struct work_struct *work)
1006 {
1007         struct delayed_work *delayed_work = to_delayed_work(work);
1008         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1009         struct drm_connector *connector;
1010         enum drm_connector_status old_status;
1011         bool repoll = false, changed = false;
1012
1013         if (!drm_kms_helper_poll)
1014                 return;
1015
1016         mutex_lock(&dev->mode_config.mutex);
1017         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1018
1019                 /* Ignore forced connectors. */
1020                 if (connector->force)
1021                         continue;
1022
1023                 /* Ignore HPD capable connectors and connectors where we don't
1024                  * want any hotplug detection at all for polling. */
1025                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1026                         continue;
1027
1028                 repoll = true;
1029
1030                 old_status = connector->status;
1031                 /* if we are connected and don't want to poll for disconnect
1032                    skip it */
1033                 if (old_status == connector_status_connected &&
1034                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1035                         continue;
1036
1037                 connector->status = connector->funcs->detect(connector, false);
1038                 if (old_status != connector->status) {
1039                         const char *old, *new;
1040
1041                         old = drm_get_connector_status_name(old_status);
1042                         new = drm_get_connector_status_name(connector->status);
1043
1044                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1045                                       "status updated from %s to %s\n",
1046                                       connector->base.id,
1047                                       drm_get_connector_name(connector),
1048                                       old, new);
1049
1050                         changed = true;
1051                 }
1052         }
1053
1054         mutex_unlock(&dev->mode_config.mutex);
1055
1056         if (changed)
1057                 drm_kms_helper_hotplug_event(dev);
1058
1059         if (repoll)
1060                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1061 }
1062
1063 void drm_kms_helper_poll_disable(struct drm_device *dev)
1064 {
1065         if (!dev->mode_config.poll_enabled)
1066                 return;
1067         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1068 }
1069 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1070
1071 void drm_kms_helper_poll_enable(struct drm_device *dev)
1072 {
1073         bool poll = false;
1074         struct drm_connector *connector;
1075
1076         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1077                 return;
1078
1079         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1080                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1081                                          DRM_CONNECTOR_POLL_DISCONNECT))
1082                         poll = true;
1083         }
1084
1085         if (poll)
1086                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1087 }
1088 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1089
1090 void drm_kms_helper_poll_init(struct drm_device *dev)
1091 {
1092         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1093         dev->mode_config.poll_enabled = true;
1094
1095         drm_kms_helper_poll_enable(dev);
1096 }
1097 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1098
1099 void drm_kms_helper_poll_fini(struct drm_device *dev)
1100 {
1101         drm_kms_helper_poll_disable(dev);
1102 }
1103 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1104
1105 bool drm_helper_hpd_irq_event(struct drm_device *dev)
1106 {
1107         struct drm_connector *connector;
1108         enum drm_connector_status old_status;
1109         bool changed = false;
1110
1111         if (!dev->mode_config.poll_enabled)
1112                 return false;
1113
1114         mutex_lock(&dev->mode_config.mutex);
1115         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1116
1117                 /* Only handle HPD capable connectors. */
1118                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1119                         continue;
1120
1121                 old_status = connector->status;
1122
1123                 connector->status = connector->funcs->detect(connector, false);
1124                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1125                               connector->base.id,
1126                               drm_get_connector_name(connector),
1127                               drm_get_connector_status_name(old_status),
1128                               drm_get_connector_status_name(connector->status));
1129                 if (old_status != connector->status)
1130                         changed = true;
1131         }
1132
1133         mutex_unlock(&dev->mode_config.mutex);
1134
1135         if (changed)
1136                 drm_kms_helper_hotplug_event(dev);
1137
1138         return changed;
1139 }
1140 EXPORT_SYMBOL(drm_helper_hpd_irq_event);