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, saved_hwmode;
 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         struct drm_encoder *encoder;
 413         bool ret = true;
 414
 415         crtc->enabled = drm_helper_crtc_in_use(crtc);
 416         if (!crtc->enabled)
 417                 return true;
 418
 419         adjusted_mode = drm_mode_duplicate(dev, mode);
 420         if (!adjusted_mode)
 421                 return false;
 422
 423         saved_hwmode = crtc->hwmode;
 424         saved_mode = crtc->mode;
 425         saved_x = crtc->x;
 426         saved_y = crtc->y;
 427
 428         /* Update crtc values up front so the driver can rely on them for mode
 429          * setting.
 430          */
 431         crtc->mode = *mode;
 432         crtc->x = x;
 433         crtc->y = y;
 434
 435         /* Pass our mode to the connectors and the CRTC to give them a chance to
 436          * adjust it according to limitations or connector properties, and also
 437          * a chance to reject the mode entirely.
 438          */
 439         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 440
 441                 if (encoder->crtc != crtc)
 442                         continue;
 443
 444                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 445                         ret = encoder->bridge->funcs->mode_fixup(
 446                                         encoder->bridge, mode, adjusted_mode);
 447                         if (!ret) {
 448                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 449                                 goto done;
 450                         }
 451                 }
 452
 453                 encoder_funcs = encoder->helper_private;
 454                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 455                                                       adjusted_mode))) {
 456                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 457                         goto done;
 458                 }
 459         }
 460
 461         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 462                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 463                 goto done;
 464         }
 465         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 466
 467         /* Prepare the encoders and CRTCs before setting the mode. */
 468         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 469
 470                 if (encoder->crtc != crtc)
 471                         continue;
 472
 473                 if (encoder->bridge)
 474                         encoder->bridge->funcs->disable(encoder->bridge);
 475
 476                 encoder_funcs = encoder->helper_private;
 477                 /* Disable the encoders as the first thing we do. */
 478                 encoder_funcs->prepare(encoder);
 479
 480                 if (encoder->bridge)
 481                         encoder->bridge->funcs->post_disable(encoder->bridge);
 482         }
 483
 484         drm_crtc_prepare_encoders(dev);
 485
 486         crtc_funcs->prepare(crtc);
 487
 488         /* Set up the DPLL and any encoders state that needs to adjust or depend
 489          * on the DPLL.
 490          */
 491         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 492         if (!ret)
 493             goto done;
 494
 495         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 496
 497                 if (encoder->crtc != crtc)
 498                         continue;
 499
 500                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 501                         encoder->base.id, drm_get_encoder_name(encoder),
 502                         mode->base.id, mode->name);
 503                 encoder_funcs = encoder->helper_private;
 504                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 505
 506                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 507                         encoder->bridge->funcs->mode_set(encoder->bridge, mode,
 508                                         adjusted_mode);
 509         }
 510
 511         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 512         crtc_funcs->commit(crtc);
 513
 514         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 515
 516                 if (encoder->crtc != crtc)
 517                         continue;
 518
 519                 if (encoder->bridge)
 520                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 521
 522                 encoder_funcs = encoder->helper_private;
 523                 encoder_funcs->commit(encoder);
 524
 525                 if (encoder->bridge)
 526                         encoder->bridge->funcs->enable(encoder->bridge);
 527         }
 528
 529         /* Store real post-adjustment hardware mode. */
 530         crtc->hwmode = *adjusted_mode;
 531
 532         /* Calculate and store various constants which
 533          * are later needed by vblank and swap-completion
 534          * timestamping. They are derived from true hwmode.
 535          */
 536         drm_calc_timestamping_constants(crtc);
 537
 538         /* FIXME: add subpixel order */
 539 done:
 540         drm_mode_destroy(dev, adjusted_mode);
 541         if (!ret) {
 542                 crtc->hwmode = saved_hwmode;
 543                 crtc->mode = saved_mode;
 544                 crtc->x = saved_x;
 545                 crtc->y = saved_y;
 546         }
 547
 548         return ret;
 549 }
 550 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 551
 552
 553 static int
 554 drm_crtc_helper_disable(struct drm_crtc *crtc)
 555 {
 556         struct drm_device *dev = crtc->dev;
 557         struct drm_connector *connector;
 558         struct drm_encoder *encoder;
 559
 560         /* Decouple all encoders and their attached connectors from this crtc */
 561         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 562                 if (encoder->crtc != crtc)
 563                         continue;
 564
 565                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 566                         if (connector->encoder != encoder)
 567                                 continue;
 568
 569                         connector->encoder = NULL;
 570
 571                         /*
 572                          * drm_helper_disable_unused_functions() ought to be
 573                          * doing this, but since we've decoupled the encoder
 574                          * from the connector above, the required connection
 575                          * between them is henceforth no longer available.
 576                          */
 577                         connector->dpms = DRM_MODE_DPMS_OFF;
 578                 }
 579         }
 580
 581         drm_helper_disable_unused_functions(dev);
 582         return 0;
 583 }
 584
 585 /**
 586  * drm_crtc_helper_set_config - set a new config from userspace
 587  * @set: mode set configuration
 588  *
 589  * LOCKING:
 590  * Caller must hold mode config lock.
 591  *
 592  * Setup a new configuration, provided by the upper layers (either an ioctl call
 593  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 594  * enable it. This is the main helper functions for drivers that implement
 595  * kernel mode setting with the crtc helper functions and the assorted
 596  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 597  *
 598  * RETURNS:
 599  * Returns 0 on success, -ERRNO on failure.
 600  */
 601 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 602 {
 603         struct drm_device *dev;
 604         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 605         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 606         struct drm_framebuffer *old_fb = NULL;
 607         bool mode_changed = false; /* if true do a full mode set */
 608         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 609         struct drm_connector *save_connectors, *connector;
 610         int count = 0, ro, fail = 0;
 611         struct drm_crtc_helper_funcs *crtc_funcs;
 612         struct drm_mode_set save_set;
 613         int ret;
 614         int i;
 615
 616         DRM_DEBUG_KMS("\n");
 617
 618         BUG_ON(!set);
 619         BUG_ON(!set->crtc);
 620         BUG_ON(!set->crtc->helper_private);
 621
 622         /* Enforce sane interface api - has been abused by the fb helper. */
 623         BUG_ON(!set->mode && set->fb);
 624         BUG_ON(set->fb && set->num_connectors == 0);
 625
 626         crtc_funcs = set->crtc->helper_private;
 627
 628         if (!set->mode)
 629                 set->fb = NULL;
 630
 631         if (set->fb) {
 632                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 633                                 set->crtc->base.id, set->fb->base.id,
 634                                 (int)set->num_connectors, set->x, set->y);
 635         } else {
 636                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 637                 return drm_crtc_helper_disable(set->crtc);
 638         }
 639
 640         dev = set->crtc->dev;
 641
 642         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 643          * connector data. */
 644         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 645                              sizeof(struct drm_crtc), GFP_KERNEL);
 646         if (!save_crtcs)
 647                 return -ENOMEM;
 648
 649         save_encoders = kzalloc(dev->mode_config.num_encoder *
 650                                 sizeof(struct drm_encoder), GFP_KERNEL);
 651         if (!save_encoders) {
 652                 kfree(save_crtcs);
 653                 return -ENOMEM;
 654         }
 655
 656         save_connectors = kzalloc(dev->mode_config.num_connector *
 657                                 sizeof(struct drm_connector), GFP_KERNEL);
 658         if (!save_connectors) {
 659                 kfree(save_crtcs);
 660                 kfree(save_encoders);
 661                 return -ENOMEM;
 662         }
 663
 664         /* Copy data. Note that driver private data is not affected.
 665          * Should anything bad happen only the expected state is
 666          * restored, not the drivers personal bookkeeping.
 667          */
 668         count = 0;
 669         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 670                 save_crtcs[count++] = *crtc;
 671         }
 672
 673         count = 0;
 674         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 675                 save_encoders[count++] = *encoder;
 676         }
 677
 678         count = 0;
 679         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 680                 save_connectors[count++] = *connector;
 681         }
 682
 683         save_set.crtc = set->crtc;
 684         save_set.mode = &set->crtc->mode;
 685         save_set.x = set->crtc->x;
 686         save_set.y = set->crtc->y;
 687         save_set.fb = set->crtc->fb;
 688
 689         /* We should be able to check here if the fb has the same properties
 690          * and then just flip_or_move it */
 691         if (set->crtc->fb != set->fb) {
 692                 /* If we have no fb then treat it as a full mode set */
 693                 if (set->crtc->fb == NULL) {
 694                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 695                         mode_changed = true;
 696                 } else if (set->fb == NULL) {
 697                         mode_changed = true;
 698                 } else if (set->fb->pixel_format !=
 699                            set->crtc->fb->pixel_format) {
 700                         mode_changed = true;
 701                 } else
 702                         fb_changed = true;
 703         }
 704
 705         if (set->x != set->crtc->x || set->y != set->crtc->y)
 706                 fb_changed = true;
 707
 708         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 709                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 710                 drm_mode_debug_printmodeline(&set->crtc->mode);
 711                 drm_mode_debug_printmodeline(set->mode);
 712                 mode_changed = true;
 713         }
 714
 715         /* a) traverse passed in connector list and get encoders for them */
 716         count = 0;
 717         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 718                 struct drm_connector_helper_funcs *connector_funcs =
 719                         connector->helper_private;
 720                 new_encoder = connector->encoder;
 721                 for (ro = 0; ro < set->num_connectors; ro++) {
 722                         if (set->connectors[ro] == connector) {
 723                                 new_encoder = connector_funcs->best_encoder(connector);
 724                                 /* if we can't get an encoder for a connector
 725                                    we are setting now - then fail */
 726                                 if (new_encoder == NULL)
 727                                         /* don't break so fail path works correct */
 728                                         fail = 1;
 729                                 break;
 730
 731                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 732                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 733                                         mode_changed = true;
 734                                 }
 735                         }
 736                 }
 737
 738                 if (new_encoder != connector->encoder) {
 739                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 740                         mode_changed = true;
 741                         /* If the encoder is reused for another connector, then
 742                          * the appropriate crtc will be set later.
 743                          */
 744                         if (connector->encoder)
 745                                 connector->encoder->crtc = NULL;
 746                         connector->encoder = new_encoder;
 747                 }
 748         }
 749
 750         if (fail) {
 751                 ret = -EINVAL;
 752                 goto fail;
 753         }
 754
 755         count = 0;
 756         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 757                 if (!connector->encoder)
 758                         continue;
 759
 760                 if (connector->encoder->crtc == set->crtc)
 761                         new_crtc = NULL;
 762                 else
 763                         new_crtc = connector->encoder->crtc;
 764
 765                 for (ro = 0; ro < set->num_connectors; ro++) {
 766                         if (set->connectors[ro] == connector)
 767                                 new_crtc = set->crtc;
 768                 }
 769
 770                 /* Make sure the new CRTC will work with the encoder */
 771                 if (new_crtc &&
 772                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 773                         ret = -EINVAL;
 774                         goto fail;
 775                 }
 776                 if (new_crtc != connector->encoder->crtc) {
 777                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 778                         mode_changed = true;
 779                         connector->encoder->crtc = new_crtc;
 780                 }
 781                 if (new_crtc) {
 782                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 783                                 connector->base.id, drm_get_connector_name(connector),
 784                                 new_crtc->base.id);
 785                 } else {
 786                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 787                                 connector->base.id, drm_get_connector_name(connector));
 788                 }
 789         }
 790
 791         /* mode_set_base is not a required function */
 792         if (fb_changed && !crtc_funcs->mode_set_base)
 793                 mode_changed = true;
 794
 795         if (mode_changed) {
 796                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 797                 if (set->crtc->enabled) {
 798                         DRM_DEBUG_KMS("attempting to set mode from"
 799                                         " userspace\n");
 800                         drm_mode_debug_printmodeline(set->mode);
 801                         old_fb = set->crtc->fb;
 802                         set->crtc->fb = set->fb;
 803                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 804                                                       set->x, set->y,
 805                                                       old_fb)) {
 806                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 807                                           set->crtc->base.id);
 808                                 set->crtc->fb = old_fb;
 809                                 ret = -EINVAL;
 810                                 goto fail;
 811                         }
 812                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 813                         for (i = 0; i < set->num_connectors; i++) {
 814                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 815                                               drm_get_connector_name(set->connectors[i]));
 816                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 817                         }
 818                 }
 819                 drm_helper_disable_unused_functions(dev);
 820         } else if (fb_changed) {
 821                 set->crtc->x = set->x;
 822                 set->crtc->y = set->y;
 823
 824                 old_fb = set->crtc->fb;
 825                 if (set->crtc->fb != set->fb)
 826                         set->crtc->fb = set->fb;
 827                 ret = crtc_funcs->mode_set_base(set->crtc,
 828                                                 set->x, set->y, old_fb);
 829                 if (ret != 0) {
 830                         set->crtc->fb = old_fb;
 831                         goto fail;
 832                 }
 833         }
 834
 835         kfree(save_connectors);
 836         kfree(save_encoders);
 837         kfree(save_crtcs);
 838         return 0;
 839
 840 fail:
 841         /* Restore all previous data. */
 842         count = 0;
 843         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 844                 *crtc = save_crtcs[count++];
 845         }
 846
 847         count = 0;
 848         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 849                 *encoder = save_encoders[count++];
 850         }
 851
 852         count = 0;
 853         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 854                 *connector = save_connectors[count++];
 855         }
 856
 857         /* Try to restore the config */
 858         if (mode_changed &&
 859             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 860                                       save_set.y, save_set.fb))
 861                 DRM_ERROR("failed to restore config after modeset failure\n");
 862
 863         kfree(save_connectors);
 864         kfree(save_encoders);
 865         kfree(save_crtcs);
 866         return ret;
 867 }
 868 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 869
 870 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 871 {
 872         int dpms = DRM_MODE_DPMS_OFF;
 873         struct drm_connector *connector;
 874         struct drm_device *dev = encoder->dev;
 875
 876         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 877                 if (connector->encoder == encoder)
 878                         if (connector->dpms < dpms)
 879                                 dpms = connector->dpms;
 880         return dpms;
 881 }
 882
 883 /* Helper which handles bridge ordering around encoder dpms */
 884 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 885 {
 886         struct drm_bridge *bridge = encoder->bridge;
 887         struct drm_encoder_helper_funcs *encoder_funcs;
 888
 889         if (bridge) {
 890                 if (mode == DRM_MODE_DPMS_ON)
 891                         bridge->funcs->pre_enable(bridge);
 892                 else
 893                         bridge->funcs->disable(bridge);
 894         }
 895
 896         encoder_funcs = encoder->helper_private;
 897         if (encoder_funcs->dpms)
 898                 encoder_funcs->dpms(encoder, mode);
 899
 900         if (bridge) {
 901                 if (mode == DRM_MODE_DPMS_ON)
 902                         bridge->funcs->enable(bridge);
 903                 else
 904                         bridge->funcs->post_disable(bridge);
 905         }
 906 }
 907
 908 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 909 {
 910         int dpms = DRM_MODE_DPMS_OFF;
 911         struct drm_connector *connector;
 912         struct drm_device *dev = crtc->dev;
 913
 914         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 915                 if (connector->encoder && connector->encoder->crtc == crtc)
 916                         if (connector->dpms < dpms)
 917                                 dpms = connector->dpms;
 918         return dpms;
 919 }
 920
 921 /**
 922  * drm_helper_connector_dpms() - connector dpms helper implementation
 923  * @connector: affected connector
 924  * @mode: DPMS mode
 925  *
 926  * This is the main helper function provided by the crtc helper framework for
 927  * implementing the DPMS connector attribute. It computes the new desired DPMS
 928  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 929  * callback provided by the driver appropriately.
 930  */
 931 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 932 {
 933         struct drm_encoder *encoder = connector->encoder;
 934         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 935         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 936
 937         if (mode == connector->dpms)
 938                 return;
 939
 940         old_dpms = connector->dpms;
 941         connector->dpms = mode;
 942
 943         if (encoder)
 944                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 945
 946         /* from off to on, do crtc then encoder */
 947         if (mode < old_dpms) {
 948                 if (crtc) {
 949                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 950                         if (crtc_funcs->dpms)
 951                                 (*crtc_funcs->dpms) (crtc,
 952                                                      drm_helper_choose_crtc_dpms(crtc));
 953                 }
 954                 if (encoder)
 955                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 956         }
 957
 958         /* from on to off, do encoder then crtc */
 959         if (mode > old_dpms) {
 960                 if (encoder)
 961                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 962                 if (crtc) {
 963                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 964                         if (crtc_funcs->dpms)
 965                                 (*crtc_funcs->dpms) (crtc,
 966                                                      drm_helper_choose_crtc_dpms(crtc));
 967                 }
 968         }
 969
 970         return;
 971 }
 972 EXPORT_SYMBOL(drm_helper_connector_dpms);
 973
 974 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 975                                    struct drm_mode_fb_cmd2 *mode_cmd)
 976 {
 977         int i;
 978
 979         fb->width = mode_cmd->width;
 980         fb->height = mode_cmd->height;
 981         for (i = 0; i < 4; i++) {
 982                 fb->pitches[i] = mode_cmd->pitches[i];
 983                 fb->offsets[i] = mode_cmd->offsets[i];
 984         }
 985         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 986                                     &fb->bits_per_pixel);
 987         fb->pixel_format = mode_cmd->pixel_format;
 988
 989         return 0;
 990 }
 991 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 992
 993 int drm_helper_resume_force_mode(struct drm_device *dev)
 994 {
 995         struct drm_crtc *crtc;
 996         struct drm_encoder *encoder;
 997         struct drm_crtc_helper_funcs *crtc_funcs;
 998         int ret, encoder_dpms;
 999
1000         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1001
1002                 if (!crtc->enabled)
1003                         continue;
1004
1005                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1006                                                crtc->x, crtc->y, crtc->fb);
1007
1008                 if (ret == false)
1009                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1010
1011                 /* Turn off outputs that were already powered off */
1012                 if (drm_helper_choose_crtc_dpms(crtc)) {
1013                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1014
1015                                 if(encoder->crtc != crtc)
1016                                         continue;
1017
1018                                 encoder_dpms = drm_helper_choose_encoder_dpms(
1019                                                         encoder);
1020
1021                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
1022                         }
1023
1024                         crtc_funcs = crtc->helper_private;
1025                         if (crtc_funcs->dpms)
1026                                 (*crtc_funcs->dpms) (crtc,
1027                                                      drm_helper_choose_crtc_dpms(crtc));
1028                 }
1029         }
1030         /* disable the unused connectors while restoring the modesetting */
1031         drm_helper_disable_unused_functions(dev);
1032         return 0;
1033 }
1034 EXPORT_SYMBOL(drm_helper_resume_force_mode);
1035
1036 void drm_kms_helper_hotplug_event(struct drm_device *dev)
1037 {
1038         /* send a uevent + call fbdev */
1039         drm_sysfs_hotplug_event(dev);
1040         if (dev->mode_config.funcs->output_poll_changed)
1041                 dev->mode_config.funcs->output_poll_changed(dev);
1042 }
1043 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1044
1045 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1046 static void output_poll_execute(struct work_struct *work)
1047 {
1048         struct delayed_work *delayed_work = to_delayed_work(work);
1049         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1050         struct drm_connector *connector;
1051         enum drm_connector_status old_status;
1052         bool repoll = false, changed = false;
1053
1054         if (!drm_kms_helper_poll)
1055                 return;
1056
1057         mutex_lock(&dev->mode_config.mutex);
1058         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1059
1060                 /* Ignore forced connectors. */
1061                 if (connector->force)
1062                         continue;
1063
1064                 /* Ignore HPD capable connectors and connectors where we don't
1065                  * want any hotplug detection at all for polling. */
1066                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1067                         continue;
1068
1069                 repoll = true;
1070
1071                 old_status = connector->status;
1072                 /* if we are connected and don't want to poll for disconnect
1073                    skip it */
1074                 if (old_status == connector_status_connected &&
1075                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1076                         continue;
1077
1078                 connector->status = connector->funcs->detect(connector, false);
1079                 if (old_status != connector->status) {
1080                         const char *old, *new;
1081
1082                         old = drm_get_connector_status_name(old_status);
1083                         new = drm_get_connector_status_name(connector->status);
1084
1085                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1086                                       "status updated from %s to %s\n",
1087                                       connector->base.id,
1088                                       drm_get_connector_name(connector),
1089                                       old, new);
1090
1091                         changed = true;
1092                 }
1093         }
1094
1095         mutex_unlock(&dev->mode_config.mutex);
1096
1097         if (changed)
1098                 drm_kms_helper_hotplug_event(dev);
1099
1100         if (repoll)
1101                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1102 }
1103
1104 void drm_kms_helper_poll_disable(struct drm_device *dev)
1105 {
1106         if (!dev->mode_config.poll_enabled)
1107                 return;
1108         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1109 }
1110 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1111
1112 void drm_kms_helper_poll_enable(struct drm_device *dev)
1113 {
1114         bool poll = false;
1115         struct drm_connector *connector;
1116
1117         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1118                 return;
1119
1120         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1121                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1122                                          DRM_CONNECTOR_POLL_DISCONNECT))
1123                         poll = true;
1124         }
1125
1126         if (poll)
1127                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1128 }
1129 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1130
1131 void drm_kms_helper_poll_init(struct drm_device *dev)
1132 {
1133         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1134         dev->mode_config.poll_enabled = true;
1135
1136         drm_kms_helper_poll_enable(dev);
1137 }
1138 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1139
1140 void drm_kms_helper_poll_fini(struct drm_device *dev)
1141 {
1142         drm_kms_helper_poll_disable(dev);
1143 }
1144 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1145
1146 void drm_helper_hpd_irq_event(struct drm_device *dev)
1147 {
1148         struct drm_connector *connector;
1149         enum drm_connector_status old_status;
1150         bool changed = false;
1151
1152         if (!dev->mode_config.poll_enabled)
1153                 return;
1154
1155         mutex_lock(&dev->mode_config.mutex);
1156         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1157
1158                 /* Only handle HPD capable connectors. */
1159                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1160                         continue;
1161
1162                 old_status = connector->status;
1163
1164                 connector->status = connector->funcs->detect(connector, false);
1165                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1166                               connector->base.id,
1167                               drm_get_connector_name(connector),
1168                               drm_get_connector_status_name(old_status),
1169                               drm_get_connector_status_name(connector->status));
1170                 if (old_status != connector->status)
1171                         changed = true;
1172         }
1173
1174         mutex_unlock(&dev->mode_config.mutex);
1175
1176         if (changed)
1177                 drm_kms_helper_hotplug_event(dev);
1178 }
1179 EXPORT_SYMBOL(drm_helper_hpd_irq_event);