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 /**
  43  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  44  *                                              connector list
  45  * @dev: drm device to operate on
  46  *
  47  * Some userspace presumes that the first connected connector is the main
  48  * display, where it's supposed to display e.g. the login screen. For
  49  * laptops, this should be the main panel. Use this function to sort all
  50  * (eDP/LVDS) panels to the front of the connector list, instead of
  51  * painstakingly trying to initialize them in the right order.
  52  */
  53 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  54 {
  55         struct drm_connector *connector, *tmp;
  56         struct list_head panel_list;
  57
  58         INIT_LIST_HEAD(&panel_list);
  59
  60         list_for_each_entry_safe(connector, tmp,
  61                                  &dev->mode_config.connector_list, head) {
  62                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  63                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  64                         list_move_tail(&connector->head, &panel_list);
  65         }
  66
  67         list_splice(&panel_list, &dev->mode_config.connector_list);
  68 }
  69 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  70
  71 static bool drm_kms_helper_poll = true;
  72 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  73
  74 static void drm_mode_validate_flag(struct drm_connector *connector,
  75                                    int flags)
  76 {
  77         struct drm_display_mode *mode;
  78
  79         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
  80                       DRM_MODE_FLAG_3D_MASK))
  81                 return;
  82
  83         list_for_each_entry(mode, &connector->modes, head) {
  84                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  85                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  86                         mode->status = MODE_NO_INTERLACE;
  87                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  88                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  89                         mode->status = MODE_NO_DBLESCAN;
  90                 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
  91                                 !(flags & DRM_MODE_FLAG_3D_MASK))
  92                         mode->status = MODE_NO_STEREO;
  93         }
  94
  95         return;
  96 }
  97
  98 /**
  99  * drm_helper_probe_single_connector_modes - get complete set of display modes
 100  * @connector: connector to probe
 101  * @maxX: max width for modes
 102  * @maxY: max height for modes
 103  *
 104  * LOCKING:
 105  * Caller must hold mode config lock.
 106  *
 107  * Based on the helper callbacks implemented by @connector try to detect all
 108  * valid modes.  Modes will first be added to the connector's probed_modes list,
 109  * then culled (based on validity and the @maxX, @maxY parameters) and put into
 110  * the normal modes list.
 111  *
 112  * Intended to be use as a generic implementation of the ->fill_modes()
 113  * @connector vfunc for drivers that use the crtc helpers for output mode
 114  * filtering and detection.
 115  *
 116  * RETURNS:
 117  * Number of modes found on @connector.
 118  */
 119 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 120                                             uint32_t maxX, uint32_t maxY)
 121 {
 122         struct drm_device *dev = connector->dev;
 123         struct drm_display_mode *mode;
 124         struct drm_connector_helper_funcs *connector_funcs =
 125                 connector->helper_private;
 126         int count = 0;
 127         int mode_flags = 0;
 128         bool verbose_prune = true;
 129
 130         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 131                         drm_get_connector_name(connector));
 132         /* set all modes to the unverified state */
 133         list_for_each_entry(mode, &connector->modes, head)
 134                 mode->status = MODE_UNVERIFIED;
 135
 136         if (connector->force) {
 137                 if (connector->force == DRM_FORCE_ON)
 138                         connector->status = connector_status_connected;
 139                 else
 140                         connector->status = connector_status_disconnected;
 141                 if (connector->funcs->force)
 142                         connector->funcs->force(connector);
 143         } else {
 144                 connector->status = connector->funcs->detect(connector, true);
 145         }
 146
 147         /* Re-enable polling in case the global poll config changed. */
 148         if (drm_kms_helper_poll != dev->mode_config.poll_running)
 149                 drm_kms_helper_poll_enable(dev);
 150
 151         dev->mode_config.poll_running = drm_kms_helper_poll;
 152
 153         if (connector->status == connector_status_disconnected) {
 154                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 155                         connector->base.id, drm_get_connector_name(connector));
 156                 drm_mode_connector_update_edid_property(connector, NULL);
 157                 verbose_prune = false;
 158                 goto prune;
 159         }
 160
 161 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 162         count = drm_load_edid_firmware(connector);
 163         if (count == 0)
 164 #endif
 165                 count = (*connector_funcs->get_modes)(connector);
 166
 167         if (count == 0 && connector->status == connector_status_connected)
 168                 count = drm_add_modes_noedid(connector, 1024, 768);
 169         if (count == 0)
 170                 goto prune;
 171
 172         drm_mode_connector_list_update(connector);
 173
 174         if (maxX && maxY)
 175                 drm_mode_validate_size(dev, &connector->modes, maxX,
 176                                        maxY, 0);
 177
 178         if (connector->interlace_allowed)
 179                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 180         if (connector->doublescan_allowed)
 181                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 182         if (connector->stereo_allowed)
 183                 mode_flags |= DRM_MODE_FLAG_3D_MASK;
 184         drm_mode_validate_flag(connector, mode_flags);
 185
 186         list_for_each_entry(mode, &connector->modes, head) {
 187                 if (mode->status == MODE_OK)
 188                         mode->status = connector_funcs->mode_valid(connector,
 189                                                                    mode);
 190         }
 191
 192 prune:
 193         drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
 194
 195         if (list_empty(&connector->modes))
 196                 return 0;
 197
 198         list_for_each_entry(mode, &connector->modes, head)
 199                 mode->vrefresh = drm_mode_vrefresh(mode);
 200
 201         drm_mode_sort(&connector->modes);
 202
 203         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 204                         drm_get_connector_name(connector));
 205         list_for_each_entry(mode, &connector->modes, head) {
 206                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 207                 drm_mode_debug_printmodeline(mode);
 208         }
 209
 210         return count;
 211 }
 212 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 213
 214 /**
 215  * drm_helper_encoder_in_use - check if a given encoder is in use
 216  * @encoder: encoder to check
 217  *
 218  * LOCKING:
 219  * Caller must hold mode config lock.
 220  *
 221  * Walk @encoders's DRM device's mode_config and see if it's in use.
 222  *
 223  * RETURNS:
 224  * True if @encoder is part of the mode_config, false otherwise.
 225  */
 226 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 227 {
 228         struct drm_connector *connector;
 229         struct drm_device *dev = encoder->dev;
 230         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 231                 if (connector->encoder == encoder)
 232                         return true;
 233         return false;
 234 }
 235 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 236
 237 /**
 238  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 239  * @crtc: CRTC to check
 240  *
 241  * LOCKING:
 242  * Caller must hold mode config lock.
 243  *
 244  * Walk @crtc's DRM device's mode_config and see if it's in use.
 245  *
 246  * RETURNS:
 247  * True if @crtc is part of the mode_config, false otherwise.
 248  */
 249 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 250 {
 251         struct drm_encoder *encoder;
 252         struct drm_device *dev = crtc->dev;
 253         /* FIXME: Locking around list access? */
 254         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 255                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 256                         return true;
 257         return false;
 258 }
 259 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 260
 261 static void
 262 drm_encoder_disable(struct drm_encoder *encoder)
 263 {
 264         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 265
 266         if (encoder->bridge)
 267                 encoder->bridge->funcs->disable(encoder->bridge);
 268
 269         if (encoder_funcs->disable)
 270                 (*encoder_funcs->disable)(encoder);
 271         else
 272                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 273
 274         if (encoder->bridge)
 275                 encoder->bridge->funcs->post_disable(encoder->bridge);
 276 }
 277
 278 /**
 279  * drm_helper_disable_unused_functions - disable unused objects
 280  * @dev: DRM device
 281  *
 282  * LOCKING:
 283  * Caller must hold mode config lock.
 284  *
 285  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 286  * by calling its dpms function, which should power it off.
 287  */
 288 void drm_helper_disable_unused_functions(struct drm_device *dev)
 289 {
 290         struct drm_encoder *encoder;
 291         struct drm_connector *connector;
 292         struct drm_crtc *crtc;
 293
 294         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 295                 if (!connector->encoder)
 296                         continue;
 297                 if (connector->status == connector_status_disconnected)
 298                         connector->encoder = NULL;
 299         }
 300
 301         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 302                 if (!drm_helper_encoder_in_use(encoder)) {
 303                         drm_encoder_disable(encoder);
 304                         /* disconnector encoder from any connector */
 305                         encoder->crtc = NULL;
 306                 }
 307         }
 308
 309         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 310                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 311                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 312                 if (!crtc->enabled) {
 313                         if (crtc_funcs->disable)
 314                                 (*crtc_funcs->disable)(crtc);
 315                         else
 316                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 317                         crtc->fb = NULL;
 318                 }
 319         }
 320 }
 321 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 322
 323 /**
 324  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 325  * @encoder: encoder to test
 326  * @crtc: crtc to test
 327  *
 328  * Return false if @encoder can't be driven by @crtc, true otherwise.
 329  */
 330 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 331                                 struct drm_crtc *crtc)
 332 {
 333         struct drm_device *dev;
 334         struct drm_crtc *tmp;
 335         int crtc_mask = 1;
 336
 337         WARN(!crtc, "checking null crtc?\n");
 338
 339         dev = crtc->dev;
 340
 341         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 342                 if (tmp == crtc)
 343                         break;
 344                 crtc_mask <<= 1;
 345         }
 346
 347         if (encoder->possible_crtcs & crtc_mask)
 348                 return true;
 349         return false;
 350 }
 351
 352 /*
 353  * Check the CRTC we're going to map each output to vs. its current
 354  * CRTC.  If they don't match, we have to disable the output and the CRTC
 355  * since the driver will have to re-route things.
 356  */
 357 static void
 358 drm_crtc_prepare_encoders(struct drm_device *dev)
 359 {
 360         struct drm_encoder_helper_funcs *encoder_funcs;
 361         struct drm_encoder *encoder;
 362
 363         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 364                 encoder_funcs = encoder->helper_private;
 365                 /* Disable unused encoders */
 366                 if (encoder->crtc == NULL)
 367                         drm_encoder_disable(encoder);
 368                 /* Disable encoders whose CRTC is about to change */
 369                 if (encoder_funcs->get_crtc &&
 370                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 371                         drm_encoder_disable(encoder);
 372         }
 373 }
 374
 375 /**
 376  * drm_crtc_helper_set_mode - internal helper to set a mode
 377  * @crtc: CRTC to program
 378  * @mode: mode to use
 379  * @x: horizontal offset into the surface
 380  * @y: vertical offset into the surface
 381  * @old_fb: old framebuffer, for cleanup
 382  *
 383  * LOCKING:
 384  * Caller must hold mode config lock.
 385  *
 386  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 387  * to fixup or reject the mode prior to trying to set it. This is an internal
 388  * helper that drivers could e.g. use to update properties that require the
 389  * entire output pipe to be disabled and re-enabled in a new configuration. For
 390  * example for changing whether audio is enabled on a hdmi link or for changing
 391  * panel fitter or dither attributes. It is also called by the
 392  * drm_crtc_helper_set_config() helper function to drive the mode setting
 393  * sequence.
 394  *
 395  * RETURNS:
 396  * True if the mode was set successfully, or false otherwise.
 397  */
 398 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 399                               struct drm_display_mode *mode,
 400                               int x, int y,
 401                               struct drm_framebuffer *old_fb)
 402 {
 403         struct drm_device *dev = crtc->dev;
 404         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 405         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 406         struct drm_encoder_helper_funcs *encoder_funcs;
 407         int saved_x, saved_y;
 408         struct drm_encoder *encoder;
 409         bool ret = true;
 410
 411         crtc->enabled = drm_helper_crtc_in_use(crtc);
 412         if (!crtc->enabled)
 413                 return true;
 414
 415         adjusted_mode = drm_mode_duplicate(dev, mode);
 416         if (!adjusted_mode)
 417                 return false;
 418
 419         saved_hwmode = crtc->hwmode;
 420         saved_mode = crtc->mode;
 421         saved_x = crtc->x;
 422         saved_y = crtc->y;
 423
 424         /* Update crtc values up front so the driver can rely on them for mode
 425          * setting.
 426          */
 427         crtc->mode = *mode;
 428         crtc->x = x;
 429         crtc->y = y;
 430
 431         /* Pass our mode to the connectors and the CRTC to give them a chance to
 432          * adjust it according to limitations or connector properties, and also
 433          * a chance to reject the mode entirely.
 434          */
 435         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 436
 437                 if (encoder->crtc != crtc)
 438                         continue;
 439
 440                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 441                         ret = encoder->bridge->funcs->mode_fixup(
 442                                         encoder->bridge, mode, adjusted_mode);
 443                         if (!ret) {
 444                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 445                                 goto done;
 446                         }
 447                 }
 448
 449                 encoder_funcs = encoder->helper_private;
 450                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 451                                                       adjusted_mode))) {
 452                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 453                         goto done;
 454                 }
 455         }
 456
 457         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 458                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 459                 goto done;
 460         }
 461         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 462
 463         /* Prepare the encoders and CRTCs before setting the mode. */
 464         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 465
 466                 if (encoder->crtc != crtc)
 467                         continue;
 468
 469                 if (encoder->bridge)
 470                         encoder->bridge->funcs->disable(encoder->bridge);
 471
 472                 encoder_funcs = encoder->helper_private;
 473                 /* Disable the encoders as the first thing we do. */
 474                 encoder_funcs->prepare(encoder);
 475
 476                 if (encoder->bridge)
 477                         encoder->bridge->funcs->post_disable(encoder->bridge);
 478         }
 479
 480         drm_crtc_prepare_encoders(dev);
 481
 482         crtc_funcs->prepare(crtc);
 483
 484         /* Set up the DPLL and any encoders state that needs to adjust or depend
 485          * on the DPLL.
 486          */
 487         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 488         if (!ret)
 489             goto done;
 490
 491         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 492
 493                 if (encoder->crtc != crtc)
 494                         continue;
 495
 496                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 497                         encoder->base.id, drm_get_encoder_name(encoder),
 498                         mode->base.id, mode->name);
 499                 encoder_funcs = encoder->helper_private;
 500                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 501
 502                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 503                         encoder->bridge->funcs->mode_set(encoder->bridge, mode,
 504                                         adjusted_mode);
 505         }
 506
 507         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 508         crtc_funcs->commit(crtc);
 509
 510         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 511
 512                 if (encoder->crtc != crtc)
 513                         continue;
 514
 515                 if (encoder->bridge)
 516                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 517
 518                 encoder_funcs = encoder->helper_private;
 519                 encoder_funcs->commit(encoder);
 520
 521                 if (encoder->bridge)
 522                         encoder->bridge->funcs->enable(encoder->bridge);
 523         }
 524
 525         /* Store real post-adjustment hardware mode. */
 526         crtc->hwmode = *adjusted_mode;
 527
 528         /* Calculate and store various constants which
 529          * are later needed by vblank and swap-completion
 530          * timestamping. They are derived from true hwmode.
 531          */
 532         drm_calc_timestamping_constants(crtc);
 533
 534         /* FIXME: add subpixel order */
 535 done:
 536         drm_mode_destroy(dev, adjusted_mode);
 537         if (!ret) {
 538                 crtc->hwmode = saved_hwmode;
 539                 crtc->mode = saved_mode;
 540                 crtc->x = saved_x;
 541                 crtc->y = saved_y;
 542         }
 543
 544         return ret;
 545 }
 546 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 547
 548
 549 static int
 550 drm_crtc_helper_disable(struct drm_crtc *crtc)
 551 {
 552         struct drm_device *dev = crtc->dev;
 553         struct drm_connector *connector;
 554         struct drm_encoder *encoder;
 555
 556         /* Decouple all encoders and their attached connectors from this crtc */
 557         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 558                 if (encoder->crtc != crtc)
 559                         continue;
 560
 561                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 562                         if (connector->encoder != encoder)
 563                                 continue;
 564
 565                         connector->encoder = NULL;
 566                 }
 567         }
 568
 569         drm_helper_disable_unused_functions(dev);
 570         return 0;
 571 }
 572
 573 /**
 574  * drm_crtc_helper_set_config - set a new config from userspace
 575  * @set: mode set configuration
 576  *
 577  * LOCKING:
 578  * Caller must hold mode config lock.
 579  *
 580  * Setup a new configuration, provided by the upper layers (either an ioctl call
 581  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 582  * enable it. This is the main helper functions for drivers that implement
 583  * kernel mode setting with the crtc helper functions and the assorted
 584  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 585  *
 586  * RETURNS:
 587  * Returns 0 on success, -ERRNO on failure.
 588  */
 589 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 590 {
 591         struct drm_device *dev;
 592         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 593         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 594         struct drm_framebuffer *old_fb = NULL;
 595         bool mode_changed = false; /* if true do a full mode set */
 596         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 597         struct drm_connector *save_connectors, *connector;
 598         int count = 0, ro, fail = 0;
 599         struct drm_crtc_helper_funcs *crtc_funcs;
 600         struct drm_mode_set save_set;
 601         int ret;
 602         int i;
 603
 604         DRM_DEBUG_KMS("\n");
 605
 606         BUG_ON(!set);
 607         BUG_ON(!set->crtc);
 608         BUG_ON(!set->crtc->helper_private);
 609
 610         /* Enforce sane interface api - has been abused by the fb helper. */
 611         BUG_ON(!set->mode && set->fb);
 612         BUG_ON(set->fb && set->num_connectors == 0);
 613
 614         crtc_funcs = set->crtc->helper_private;
 615
 616         if (!set->mode)
 617                 set->fb = NULL;
 618
 619         if (set->fb) {
 620                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 621                                 set->crtc->base.id, set->fb->base.id,
 622                                 (int)set->num_connectors, set->x, set->y);
 623         } else {
 624                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 625                 return drm_crtc_helper_disable(set->crtc);
 626         }
 627
 628         dev = set->crtc->dev;
 629
 630         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 631          * connector data. */
 632         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 633                              sizeof(struct drm_crtc), GFP_KERNEL);
 634         if (!save_crtcs)
 635                 return -ENOMEM;
 636
 637         save_encoders = kzalloc(dev->mode_config.num_encoder *
 638                                 sizeof(struct drm_encoder), GFP_KERNEL);
 639         if (!save_encoders) {
 640                 kfree(save_crtcs);
 641                 return -ENOMEM;
 642         }
 643
 644         save_connectors = kzalloc(dev->mode_config.num_connector *
 645                                 sizeof(struct drm_connector), GFP_KERNEL);
 646         if (!save_connectors) {
 647                 kfree(save_crtcs);
 648                 kfree(save_encoders);
 649                 return -ENOMEM;
 650         }
 651
 652         /* Copy data. Note that driver private data is not affected.
 653          * Should anything bad happen only the expected state is
 654          * restored, not the drivers personal bookkeeping.
 655          */
 656         count = 0;
 657         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 658                 save_crtcs[count++] = *crtc;
 659         }
 660
 661         count = 0;
 662         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 663                 save_encoders[count++] = *encoder;
 664         }
 665
 666         count = 0;
 667         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 668                 save_connectors[count++] = *connector;
 669         }
 670
 671         save_set.crtc = set->crtc;
 672         save_set.mode = &set->crtc->mode;
 673         save_set.x = set->crtc->x;
 674         save_set.y = set->crtc->y;
 675         save_set.fb = set->crtc->fb;
 676
 677         /* We should be able to check here if the fb has the same properties
 678          * and then just flip_or_move it */
 679         if (set->crtc->fb != set->fb) {
 680                 /* If we have no fb then treat it as a full mode set */
 681                 if (set->crtc->fb == NULL) {
 682                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 683                         mode_changed = true;
 684                 } else if (set->fb == NULL) {
 685                         mode_changed = true;
 686                 } else if (set->fb->pixel_format !=
 687                            set->crtc->fb->pixel_format) {
 688                         mode_changed = true;
 689                 } else
 690                         fb_changed = true;
 691         }
 692
 693         if (set->x != set->crtc->x || set->y != set->crtc->y)
 694                 fb_changed = true;
 695
 696         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 697                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 698                 drm_mode_debug_printmodeline(&set->crtc->mode);
 699                 drm_mode_debug_printmodeline(set->mode);
 700                 mode_changed = true;
 701         }
 702
 703         /* a) traverse passed in connector list and get encoders for them */
 704         count = 0;
 705         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 706                 struct drm_connector_helper_funcs *connector_funcs =
 707                         connector->helper_private;
 708                 new_encoder = connector->encoder;
 709                 for (ro = 0; ro < set->num_connectors; ro++) {
 710                         if (set->connectors[ro] == connector) {
 711                                 new_encoder = connector_funcs->best_encoder(connector);
 712                                 /* if we can't get an encoder for a connector
 713                                    we are setting now - then fail */
 714                                 if (new_encoder == NULL)
 715                                         /* don't break so fail path works correct */
 716                                         fail = 1;
 717                                 break;
 718
 719                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 720                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 721                                         mode_changed = true;
 722                                 }
 723                         }
 724                 }
 725
 726                 if (new_encoder != connector->encoder) {
 727                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 728                         mode_changed = true;
 729                         /* If the encoder is reused for another connector, then
 730                          * the appropriate crtc will be set later.
 731                          */
 732                         if (connector->encoder)
 733                                 connector->encoder->crtc = NULL;
 734                         connector->encoder = new_encoder;
 735                 }
 736         }
 737
 738         if (fail) {
 739                 ret = -EINVAL;
 740                 goto fail;
 741         }
 742
 743         count = 0;
 744         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 745                 if (!connector->encoder)
 746                         continue;
 747
 748                 if (connector->encoder->crtc == set->crtc)
 749                         new_crtc = NULL;
 750                 else
 751                         new_crtc = connector->encoder->crtc;
 752
 753                 for (ro = 0; ro < set->num_connectors; ro++) {
 754                         if (set->connectors[ro] == connector)
 755                                 new_crtc = set->crtc;
 756                 }
 757
 758                 /* Make sure the new CRTC will work with the encoder */
 759                 if (new_crtc &&
 760                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 761                         ret = -EINVAL;
 762                         goto fail;
 763                 }
 764                 if (new_crtc != connector->encoder->crtc) {
 765                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 766                         mode_changed = true;
 767                         connector->encoder->crtc = new_crtc;
 768                 }
 769                 if (new_crtc) {
 770                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 771                                 connector->base.id, drm_get_connector_name(connector),
 772                                 new_crtc->base.id);
 773                 } else {
 774                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 775                                 connector->base.id, drm_get_connector_name(connector));
 776                 }
 777         }
 778
 779         /* mode_set_base is not a required function */
 780         if (fb_changed && !crtc_funcs->mode_set_base)
 781                 mode_changed = true;
 782
 783         if (mode_changed) {
 784                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 785                 if (set->crtc->enabled) {
 786                         DRM_DEBUG_KMS("attempting to set mode from"
 787                                         " userspace\n");
 788                         drm_mode_debug_printmodeline(set->mode);
 789                         old_fb = set->crtc->fb;
 790                         set->crtc->fb = set->fb;
 791                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 792                                                       set->x, set->y,
 793                                                       old_fb)) {
 794                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 795                                           set->crtc->base.id);
 796                                 set->crtc->fb = old_fb;
 797                                 ret = -EINVAL;
 798                                 goto fail;
 799                         }
 800                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 801                         for (i = 0; i < set->num_connectors; i++) {
 802                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 803                                               drm_get_connector_name(set->connectors[i]));
 804                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 805                         }
 806                 }
 807                 drm_helper_disable_unused_functions(dev);
 808         } else if (fb_changed) {
 809                 set->crtc->x = set->x;
 810                 set->crtc->y = set->y;
 811
 812                 old_fb = set->crtc->fb;
 813                 if (set->crtc->fb != set->fb)
 814                         set->crtc->fb = set->fb;
 815                 ret = crtc_funcs->mode_set_base(set->crtc,
 816                                                 set->x, set->y, old_fb);
 817                 if (ret != 0) {
 818                         set->crtc->fb = old_fb;
 819                         goto fail;
 820                 }
 821         }
 822
 823         kfree(save_connectors);
 824         kfree(save_encoders);
 825         kfree(save_crtcs);
 826         return 0;
 827
 828 fail:
 829         /* Restore all previous data. */
 830         count = 0;
 831         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 832                 *crtc = save_crtcs[count++];
 833         }
 834
 835         count = 0;
 836         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 837                 *encoder = save_encoders[count++];
 838         }
 839
 840         count = 0;
 841         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 842                 *connector = save_connectors[count++];
 843         }
 844
 845         /* Try to restore the config */
 846         if (mode_changed &&
 847             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 848                                       save_set.y, save_set.fb))
 849                 DRM_ERROR("failed to restore config after modeset failure\n");
 850
 851         kfree(save_connectors);
 852         kfree(save_encoders);
 853         kfree(save_crtcs);
 854         return ret;
 855 }
 856 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 857
 858 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 859 {
 860         int dpms = DRM_MODE_DPMS_OFF;
 861         struct drm_connector *connector;
 862         struct drm_device *dev = encoder->dev;
 863
 864         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 865                 if (connector->encoder == encoder)
 866                         if (connector->dpms < dpms)
 867                                 dpms = connector->dpms;
 868         return dpms;
 869 }
 870
 871 /* Helper which handles bridge ordering around encoder dpms */
 872 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 873 {
 874         struct drm_bridge *bridge = encoder->bridge;
 875         struct drm_encoder_helper_funcs *encoder_funcs;
 876
 877         if (bridge) {
 878                 if (mode == DRM_MODE_DPMS_ON)
 879                         bridge->funcs->pre_enable(bridge);
 880                 else
 881                         bridge->funcs->disable(bridge);
 882         }
 883
 884         encoder_funcs = encoder->helper_private;
 885         if (encoder_funcs->dpms)
 886                 encoder_funcs->dpms(encoder, mode);
 887
 888         if (bridge) {
 889                 if (mode == DRM_MODE_DPMS_ON)
 890                         bridge->funcs->enable(bridge);
 891                 else
 892                         bridge->funcs->post_disable(bridge);
 893         }
 894 }
 895
 896 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 897 {
 898         int dpms = DRM_MODE_DPMS_OFF;
 899         struct drm_connector *connector;
 900         struct drm_device *dev = crtc->dev;
 901
 902         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 903                 if (connector->encoder && connector->encoder->crtc == crtc)
 904                         if (connector->dpms < dpms)
 905                                 dpms = connector->dpms;
 906         return dpms;
 907 }
 908
 909 /**
 910  * drm_helper_connector_dpms() - connector dpms helper implementation
 911  * @connector: affected connector
 912  * @mode: DPMS mode
 913  *
 914  * This is the main helper function provided by the crtc helper framework for
 915  * implementing the DPMS connector attribute. It computes the new desired DPMS
 916  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 917  * callback provided by the driver appropriately.
 918  */
 919 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 920 {
 921         struct drm_encoder *encoder = connector->encoder;
 922         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 923         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 924
 925         if (mode == connector->dpms)
 926                 return;
 927
 928         old_dpms = connector->dpms;
 929         connector->dpms = mode;
 930
 931         if (encoder)
 932                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 933
 934         /* from off to on, do crtc then encoder */
 935         if (mode < old_dpms) {
 936                 if (crtc) {
 937                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 938                         if (crtc_funcs->dpms)
 939                                 (*crtc_funcs->dpms) (crtc,
 940                                                      drm_helper_choose_crtc_dpms(crtc));
 941                 }
 942                 if (encoder)
 943                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 944         }
 945
 946         /* from on to off, do encoder then crtc */
 947         if (mode > old_dpms) {
 948                 if (encoder)
 949                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 950                 if (crtc) {
 951                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 952                         if (crtc_funcs->dpms)
 953                                 (*crtc_funcs->dpms) (crtc,
 954                                                      drm_helper_choose_crtc_dpms(crtc));
 955                 }
 956         }
 957
 958         return;
 959 }
 960 EXPORT_SYMBOL(drm_helper_connector_dpms);
 961
 962 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 963                                    struct drm_mode_fb_cmd2 *mode_cmd)
 964 {
 965         int i;
 966
 967         fb->width = mode_cmd->width;
 968         fb->height = mode_cmd->height;
 969         for (i = 0; i < 4; i++) {
 970                 fb->pitches[i] = mode_cmd->pitches[i];
 971                 fb->offsets[i] = mode_cmd->offsets[i];
 972         }
 973         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 974                                     &fb->bits_per_pixel);
 975         fb->pixel_format = mode_cmd->pixel_format;
 976
 977         return 0;
 978 }
 979 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 980
 981 int drm_helper_resume_force_mode(struct drm_device *dev)
 982 {
 983         struct drm_crtc *crtc;
 984         struct drm_encoder *encoder;
 985         struct drm_crtc_helper_funcs *crtc_funcs;
 986         int ret, encoder_dpms;
 987
 988         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 989
 990                 if (!crtc->enabled)
 991                         continue;
 992
 993                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 994                                                crtc->x, crtc->y, crtc->fb);
 995
 996                 if (ret == false)
 997                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 998
 999                 /* Turn off outputs that were already powered off */
1000                 if (drm_helper_choose_crtc_dpms(crtc)) {
1001                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1002
1003                                 if(encoder->crtc != crtc)
1004                                         continue;
1005
1006                                 encoder_dpms = drm_helper_choose_encoder_dpms(
1007                                                         encoder);
1008
1009                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
1010                         }
1011
1012                         crtc_funcs = crtc->helper_private;
1013                         if (crtc_funcs->dpms)
1014                                 (*crtc_funcs->dpms) (crtc,
1015                                                      drm_helper_choose_crtc_dpms(crtc));
1016                 }
1017         }
1018         /* disable the unused connectors while restoring the modesetting */
1019         drm_helper_disable_unused_functions(dev);
1020         return 0;
1021 }
1022 EXPORT_SYMBOL(drm_helper_resume_force_mode);
1023
1024 void drm_kms_helper_hotplug_event(struct drm_device *dev)
1025 {
1026         /* send a uevent + call fbdev */
1027         drm_sysfs_hotplug_event(dev);
1028         if (dev->mode_config.funcs->output_poll_changed)
1029                 dev->mode_config.funcs->output_poll_changed(dev);
1030 }
1031 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1032
1033 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1034 static void output_poll_execute(struct work_struct *work)
1035 {
1036         struct delayed_work *delayed_work = to_delayed_work(work);
1037         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1038         struct drm_connector *connector;
1039         enum drm_connector_status old_status;
1040         bool repoll = false, changed = false;
1041
1042         if (!drm_kms_helper_poll)
1043                 return;
1044
1045         mutex_lock(&dev->mode_config.mutex);
1046         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1047
1048                 /* Ignore forced connectors. */
1049                 if (connector->force)
1050                         continue;
1051
1052                 /* Ignore HPD capable connectors and connectors where we don't
1053                  * want any hotplug detection at all for polling. */
1054                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1055                         continue;
1056
1057                 repoll = true;
1058
1059                 old_status = connector->status;
1060                 /* if we are connected and don't want to poll for disconnect
1061                    skip it */
1062                 if (old_status == connector_status_connected &&
1063                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1064                         continue;
1065
1066                 connector->status = connector->funcs->detect(connector, false);
1067                 if (old_status != connector->status) {
1068                         const char *old, *new;
1069
1070                         old = drm_get_connector_status_name(old_status);
1071                         new = drm_get_connector_status_name(connector->status);
1072
1073                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1074                                       "status updated from %s to %s\n",
1075                                       connector->base.id,
1076                                       drm_get_connector_name(connector),
1077                                       old, new);
1078
1079                         changed = true;
1080                 }
1081         }
1082
1083         mutex_unlock(&dev->mode_config.mutex);
1084
1085         if (changed)
1086                 drm_kms_helper_hotplug_event(dev);
1087
1088         if (repoll)
1089                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1090 }
1091
1092 void drm_kms_helper_poll_disable(struct drm_device *dev)
1093 {
1094         if (!dev->mode_config.poll_enabled)
1095                 return;
1096         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1097 }
1098 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1099
1100 void drm_kms_helper_poll_enable(struct drm_device *dev)
1101 {
1102         bool poll = false;
1103         struct drm_connector *connector;
1104
1105         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1106                 return;
1107
1108         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1109                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1110                                          DRM_CONNECTOR_POLL_DISCONNECT))
1111                         poll = true;
1112         }
1113
1114         if (poll)
1115                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1116 }
1117 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1118
1119 void drm_kms_helper_poll_init(struct drm_device *dev)
1120 {
1121         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1122         dev->mode_config.poll_enabled = true;
1123
1124         drm_kms_helper_poll_enable(dev);
1125 }
1126 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1127
1128 void drm_kms_helper_poll_fini(struct drm_device *dev)
1129 {
1130         drm_kms_helper_poll_disable(dev);
1131 }
1132 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1133
1134 void drm_helper_hpd_irq_event(struct drm_device *dev)
1135 {
1136         struct drm_connector *connector;
1137         enum drm_connector_status old_status;
1138         bool changed = false;
1139
1140         if (!dev->mode_config.poll_enabled)
1141                 return;
1142
1143         mutex_lock(&dev->mode_config.mutex);
1144         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1145
1146                 /* Only handle HPD capable connectors. */
1147                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1148                         continue;
1149
1150                 old_status = connector->status;
1151
1152                 connector->status = connector->funcs->detect(connector, false);
1153                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1154                               connector->base.id,
1155                               drm_get_connector_name(connector),
1156                               drm_get_connector_status_name(old_status),
1157                               drm_get_connector_status_name(connector->status));
1158                 if (old_status != connector->status)
1159                         changed = true;
1160         }
1161
1162         mutex_unlock(&dev->mode_config.mutex);
1163
1164         if (changed)
1165                 drm_kms_helper_hotplug_event(dev);
1166 }
1167 EXPORT_SYMBOL(drm_helper_hpd_irq_event);