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