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