drivers/gpu/drm/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  *
   5  * DRM core CRTC related functions
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that copyright
  10  * notice and this permission notice appear in supporting documentation, and
  11  * that the name of the copyright holders not be used in advertising or
  12  * publicity pertaining to distribution of the software without specific,
  13  * written prior permission.  The copyright holders make no representations
  14  * about the suitability of this software for any purpose.  It is provided "as
  15  * is" without express or implied warranty.
  16  *
  17  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23  * OF THIS SOFTWARE.
  24  *
  25  * Authors:
  26  *      Keith Packard
  27  *      Eric Anholt <eric@anholt.net>
  28  *      Dave Airlie <airlied@linux.ie>
  29  *      Jesse Barnes <jesse.barnes@intel.com>
  30  */
  31
  32 #include <linux/export.h>
  33 #include <linux/moduleparam.h>
  34
  35 #include <drm/drmP.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_fourcc.h>
  38 #include <drm/drm_crtc_helper.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_edid.h>
  41
  42 /**
  43  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  44  *                                              connector list
  45  * @dev: drm device to operate on
  46  *
  47  * Some userspace presumes that the first connected connector is the main
  48  * display, where it's supposed to display e.g. the login screen. For
  49  * laptops, this should be the main panel. Use this function to sort all
  50  * (eDP/LVDS) panels to the front of the connector list, instead of
  51  * painstakingly trying to initialize them in the right order.
  52  */
  53 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  54 {
  55         struct drm_connector *connector, *tmp;
  56         struct list_head panel_list;
  57
  58         INIT_LIST_HEAD(&panel_list);
  59
  60         list_for_each_entry_safe(connector, tmp,
  61                                  &dev->mode_config.connector_list, head) {
  62                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  63                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  64                         list_move_tail(&connector->head, &panel_list);
  65         }
  66
  67         list_splice(&panel_list, &dev->mode_config.connector_list);
  68 }
  69 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  70
  71 static bool drm_kms_helper_poll = true;
  72 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  73
  74 static void drm_mode_validate_flag(struct drm_connector *connector,
  75                                    int flags)
  76 {
  77         struct drm_display_mode *mode;
  78
  79         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  80                 return;
  81
  82         list_for_each_entry(mode, &connector->modes, head) {
  83                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  84                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  85                         mode->status = MODE_NO_INTERLACE;
  86                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  87                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  88                         mode->status = MODE_NO_DBLESCAN;
  89         }
  90
  91         return;
  92 }
  93
  94 /**
  95  * drm_helper_probe_single_connector_modes - get complete set of display modes
  96  * @connector: connector to probe
  97  * @maxX: max width for modes
  98  * @maxY: max height for modes
  99  *
 100  * LOCKING:
 101  * Caller must hold mode config lock.
 102  *
 103  * Based on the helper callbacks implemented by @connector try to detect all
 104  * valid modes.  Modes will first be added to the connector's probed_modes list,
 105  * then culled (based on validity and the @maxX, @maxY parameters) and put into
 106  * the normal modes list.
 107  *
 108  * Intended to be use as a generic implementation of the ->probe() @connector
 109  * callback for drivers that use the crtc helpers for output mode filtering and
 110  * detection.
 111  *
 112  * RETURNS:
 113  * Number of modes found on @connector.
 114  */
 115 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 116                                             uint32_t maxX, uint32_t maxY)
 117 {
 118         struct drm_device *dev = connector->dev;
 119         struct drm_display_mode *mode;
 120         struct drm_connector_helper_funcs *connector_funcs =
 121                 connector->helper_private;
 122         int count = 0;
 123         int mode_flags = 0;
 124         bool verbose_prune = true;
 125
 126         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 127                         drm_get_connector_name(connector));
 128         /* set all modes to the unverified state */
 129         list_for_each_entry(mode, &connector->modes, head)
 130                 mode->status = MODE_UNVERIFIED;
 131
 132         if (connector->force) {
 133                 if (connector->force == DRM_FORCE_ON)
 134                         connector->status = connector_status_connected;
 135                 else
 136                         connector->status = connector_status_disconnected;
 137                 if (connector->funcs->force)
 138                         connector->funcs->force(connector);
 139         } else {
 140                 connector->status = connector->funcs->detect(connector, true);
 141         }
 142
 143         /* Re-enable polling in case the global poll config changed. */
 144         if (drm_kms_helper_poll != dev->mode_config.poll_running)
 145                 drm_kms_helper_poll_enable(dev);
 146
 147         dev->mode_config.poll_running = drm_kms_helper_poll;
 148
 149         if (connector->status == connector_status_disconnected) {
 150                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 151                         connector->base.id, drm_get_connector_name(connector));
 152                 drm_mode_connector_update_edid_property(connector, NULL);
 153                 verbose_prune = false;
 154                 goto prune;
 155         }
 156
 157 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 158         count = drm_load_edid_firmware(connector);
 159         if (count == 0)
 160 #endif
 161                 count = (*connector_funcs->get_modes)(connector);
 162
 163         if (count == 0 && connector->status == connector_status_connected)
 164                 count = drm_add_modes_noedid(connector, 1024, 768);
 165         if (count == 0)
 166                 goto prune;
 167
 168         drm_mode_connector_list_update(connector);
 169
 170         if (maxX && maxY)
 171                 drm_mode_validate_size(dev, &connector->modes, maxX,
 172                                        maxY, 0);
 173
 174         if (connector->interlace_allowed)
 175                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 176         if (connector->doublescan_allowed)
 177                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 178         drm_mode_validate_flag(connector, mode_flags);
 179
 180         list_for_each_entry(mode, &connector->modes, head) {
 181                 if (mode->status == MODE_OK)
 182                         mode->status = connector_funcs->mode_valid(connector,
 183                                                                    mode);
 184         }
 185
 186 prune:
 187         drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
 188
 189         if (list_empty(&connector->modes))
 190                 return 0;
 191
 192         list_for_each_entry(mode, &connector->modes, head)
 193                 mode->vrefresh = drm_mode_vrefresh(mode);
 194
 195         drm_mode_sort(&connector->modes);
 196
 197         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 198                         drm_get_connector_name(connector));
 199         list_for_each_entry(mode, &connector->modes, head) {
 200                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 201                 drm_mode_debug_printmodeline(mode);
 202         }
 203
 204         return count;
 205 }
 206 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 207
 208 /**
 209  * drm_helper_encoder_in_use - check if a given encoder is in use
 210  * @encoder: encoder to check
 211  *
 212  * LOCKING:
 213  * Caller must hold mode config lock.
 214  *
 215  * Walk @encoders's DRM device's mode_config and see if it's in use.
 216  *
 217  * RETURNS:
 218  * True if @encoder is part of the mode_config, false otherwise.
 219  */
 220 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 221 {
 222         struct drm_connector *connector;
 223         struct drm_device *dev = encoder->dev;
 224         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 225                 if (connector->encoder == encoder)
 226                         return true;
 227         return false;
 228 }
 229 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 230
 231 /**
 232  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 233  * @crtc: CRTC to check
 234  *
 235  * LOCKING:
 236  * Caller must hold mode config lock.
 237  *
 238  * Walk @crtc's DRM device's mode_config and see if it's in use.
 239  *
 240  * RETURNS:
 241  * True if @crtc is part of the mode_config, false otherwise.
 242  */
 243 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 244 {
 245         struct drm_encoder *encoder;
 246         struct drm_device *dev = crtc->dev;
 247         /* FIXME: Locking around list access? */
 248         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 249                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 250                         return true;
 251         return false;
 252 }
 253 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 254
 255 static void
 256 drm_encoder_disable(struct drm_encoder *encoder)
 257 {
 258         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 259
 260         if (encoder->bridge)
 261                 encoder->bridge->funcs->disable(encoder->bridge);
 262
 263         if (encoder_funcs->disable)
 264                 (*encoder_funcs->disable)(encoder);
 265         else
 266                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 267
 268         if (encoder->bridge)
 269                 encoder->bridge->funcs->post_disable(encoder->bridge);
 270 }
 271
 272 /**
 273  * drm_helper_disable_unused_functions - disable unused objects
 274  * @dev: DRM device
 275  *
 276  * LOCKING:
 277  * Caller must hold mode config lock.
 278  *
 279  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 280  * by calling its dpms function, which should power it off.
 281  */
 282 void drm_helper_disable_unused_functions(struct drm_device *dev)
 283 {
 284         struct drm_encoder *encoder;
 285         struct drm_connector *connector;
 286         struct drm_crtc *crtc;
 287
 288         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 289                 if (!connector->encoder)
 290                         continue;
 291                 if (connector->status == connector_status_disconnected)
 292                         connector->encoder = NULL;
 293         }
 294
 295         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 296                 if (!drm_helper_encoder_in_use(encoder)) {
 297                         drm_encoder_disable(encoder);
 298                         /* disconnector encoder from any connector */
 299                         encoder->crtc = NULL;
 300                 }
 301         }
 302
 303         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 304                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 305                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 306                 if (!crtc->enabled) {
 307                         if (crtc_funcs->disable)
 308                                 (*crtc_funcs->disable)(crtc);
 309                         else
 310                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 311                         crtc->fb = NULL;
 312                 }
 313         }
 314 }
 315 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 316
 317 /**
 318  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 319  * @encoder: encoder to test
 320  * @crtc: crtc to test
 321  *
 322  * Return false if @encoder can't be driven by @crtc, true otherwise.
 323  */
 324 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 325                                 struct drm_crtc *crtc)
 326 {
 327         struct drm_device *dev;
 328         struct drm_crtc *tmp;
 329         int crtc_mask = 1;
 330
 331         WARN(!crtc, "checking null crtc?\n");
 332
 333         dev = crtc->dev;
 334
 335         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 336                 if (tmp == crtc)
 337                         break;
 338                 crtc_mask <<= 1;
 339         }
 340
 341         if (encoder->possible_crtcs & crtc_mask)
 342                 return true;
 343         return false;
 344 }
 345
 346 /*
 347  * Check the CRTC we're going to map each output to vs. its current
 348  * CRTC.  If they don't match, we have to disable the output and the CRTC
 349  * since the driver will have to re-route things.
 350  */
 351 static void
 352 drm_crtc_prepare_encoders(struct drm_device *dev)
 353 {
 354         struct drm_encoder_helper_funcs *encoder_funcs;
 355         struct drm_encoder *encoder;
 356
 357         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 358                 encoder_funcs = encoder->helper_private;
 359                 /* Disable unused encoders */
 360                 if (encoder->crtc == NULL)
 361                         drm_encoder_disable(encoder);
 362                 /* Disable encoders whose CRTC is about to change */
 363                 if (encoder_funcs->get_crtc &&
 364                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 365                         drm_encoder_disable(encoder);
 366         }
 367 }
 368
 369 /**
 370  * drm_crtc_helper_set_mode - internal helper to set a mode
 371  * @crtc: CRTC to program
 372  * @mode: mode to use
 373  * @x: horizontal offset into the surface
 374  * @y: vertical offset into the surface
 375  * @old_fb: old framebuffer, for cleanup
 376  *
 377  * LOCKING:
 378  * Caller must hold mode config lock.
 379  *
 380  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 381  * to fixup or reject the mode prior to trying to set it. This is an internal
 382  * helper that drivers could e.g. use to update properties that require the
 383  * entire output pipe to be disabled and re-enabled in a new configuration. For
 384  * example for changing whether audio is enabled on a hdmi link or for changing
 385  * panel fitter or dither attributes. It is also called by the
 386  * drm_crtc_helper_set_config() helper function to drive the mode setting
 387  * sequence.
 388  *
 389  * RETURNS:
 390  * True if the mode was set successfully, or false otherwise.
 391  */
 392 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 393                               struct drm_display_mode *mode,
 394                               int x, int y,
 395                               struct drm_framebuffer *old_fb)
 396 {
 397         struct drm_device *dev = crtc->dev;
 398         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 399         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 400         struct drm_encoder_helper_funcs *encoder_funcs;
 401         int saved_x, saved_y;
 402         struct drm_encoder *encoder;
 403         bool ret = true;
 404
 405         crtc->enabled = drm_helper_crtc_in_use(crtc);
 406         if (!crtc->enabled)
 407                 return true;
 408
 409         adjusted_mode = drm_mode_duplicate(dev, mode);
 410         if (!adjusted_mode)
 411                 return false;
 412
 413         saved_hwmode = crtc->hwmode;
 414         saved_mode = crtc->mode;
 415         saved_x = crtc->x;
 416         saved_y = crtc->y;
 417
 418         /* Update crtc values up front so the driver can rely on them for mode
 419          * setting.
 420          */
 421         crtc->mode = *mode;
 422         crtc->x = x;
 423         crtc->y = y;
 424
 425         /* Pass our mode to the connectors and the CRTC to give them a chance to
 426          * adjust it according to limitations or connector properties, and also
 427          * a chance to reject the mode entirely.
 428          */
 429         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 430
 431                 if (encoder->crtc != crtc)
 432                         continue;
 433
 434                 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
 435                         ret = encoder->bridge->funcs->mode_fixup(
 436                                         encoder->bridge, mode, adjusted_mode);
 437                         if (!ret) {
 438                                 DRM_DEBUG_KMS("Bridge fixup failed\n");
 439                                 goto done;
 440                         }
 441                 }
 442
 443                 encoder_funcs = encoder->helper_private;
 444                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 445                                                       adjusted_mode))) {
 446                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 447                         goto done;
 448                 }
 449         }
 450
 451         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 452                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 453                 goto done;
 454         }
 455         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 456
 457         /* Prepare the encoders and CRTCs before setting the mode. */
 458         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 459
 460                 if (encoder->crtc != crtc)
 461                         continue;
 462
 463                 if (encoder->bridge)
 464                         encoder->bridge->funcs->disable(encoder->bridge);
 465
 466                 encoder_funcs = encoder->helper_private;
 467                 /* Disable the encoders as the first thing we do. */
 468                 encoder_funcs->prepare(encoder);
 469
 470                 if (encoder->bridge)
 471                         encoder->bridge->funcs->post_disable(encoder->bridge);
 472         }
 473
 474         drm_crtc_prepare_encoders(dev);
 475
 476         crtc_funcs->prepare(crtc);
 477
 478         /* Set up the DPLL and any encoders state that needs to adjust or depend
 479          * on the DPLL.
 480          */
 481         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 482         if (!ret)
 483             goto done;
 484
 485         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 486
 487                 if (encoder->crtc != crtc)
 488                         continue;
 489
 490                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 491                         encoder->base.id, drm_get_encoder_name(encoder),
 492                         mode->base.id, mode->name);
 493                 encoder_funcs = encoder->helper_private;
 494                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 495
 496                 if (encoder->bridge && encoder->bridge->funcs->mode_set)
 497                         encoder->bridge->funcs->mode_set(encoder->bridge, mode,
 498                                         adjusted_mode);
 499         }
 500
 501         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 502         crtc_funcs->commit(crtc);
 503
 504         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 505
 506                 if (encoder->crtc != crtc)
 507                         continue;
 508
 509                 if (encoder->bridge)
 510                         encoder->bridge->funcs->pre_enable(encoder->bridge);
 511
 512                 encoder_funcs = encoder->helper_private;
 513                 encoder_funcs->commit(encoder);
 514
 515                 if (encoder->bridge)
 516                         encoder->bridge->funcs->enable(encoder->bridge);
 517         }
 518
 519         /* Store real post-adjustment hardware mode. */
 520         crtc->hwmode = *adjusted_mode;
 521
 522         /* Calculate and store various constants which
 523          * are later needed by vblank and swap-completion
 524          * timestamping. They are derived from true hwmode.
 525          */
 526         drm_calc_timestamping_constants(crtc);
 527
 528         /* FIXME: add subpixel order */
 529 done:
 530         drm_mode_destroy(dev, adjusted_mode);
 531         if (!ret) {
 532                 crtc->hwmode = saved_hwmode;
 533                 crtc->mode = saved_mode;
 534                 crtc->x = saved_x;
 535                 crtc->y = saved_y;
 536         }
 537
 538         return ret;
 539 }
 540 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 541
 542
 543 static int
 544 drm_crtc_helper_disable(struct drm_crtc *crtc)
 545 {
 546         struct drm_device *dev = crtc->dev;
 547         struct drm_connector *connector;
 548         struct drm_encoder *encoder;
 549
 550         /* Decouple all encoders and their attached connectors from this crtc */
 551         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 552                 if (encoder->crtc != crtc)
 553                         continue;
 554
 555                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 556                         if (connector->encoder != encoder)
 557                                 continue;
 558
 559                         connector->encoder = NULL;
 560                 }
 561         }
 562
 563         drm_helper_disable_unused_functions(dev);
 564         return 0;
 565 }
 566
 567 /**
 568  * drm_crtc_helper_set_config - set a new config from userspace
 569  * @set: mode set configuration
 570  *
 571  * LOCKING:
 572  * Caller must hold mode config lock.
 573  *
 574  * Setup a new configuration, provided by the upper layers (either an ioctl call
 575  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 576  * enable it. This is the main helper functions for drivers that implement
 577  * kernel mode setting with the crtc helper functions and the assorted
 578  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 579  *
 580  * RETURNS:
 581  * Returns 0 on success, -ERRNO on failure.
 582  */
 583 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 584 {
 585         struct drm_device *dev;
 586         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 587         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 588         struct drm_framebuffer *old_fb = NULL;
 589         bool mode_changed = false; /* if true do a full mode set */
 590         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 591         struct drm_connector *save_connectors, *connector;
 592         int count = 0, ro, fail = 0;
 593         struct drm_crtc_helper_funcs *crtc_funcs;
 594         struct drm_mode_set save_set;
 595         int ret;
 596         int i;
 597
 598         DRM_DEBUG_KMS("\n");
 599
 600         BUG_ON(!set);
 601         BUG_ON(!set->crtc);
 602         BUG_ON(!set->crtc->helper_private);
 603
 604         /* Enforce sane interface api - has been abused by the fb helper. */
 605         BUG_ON(!set->mode && set->fb);
 606         BUG_ON(set->fb && set->num_connectors == 0);
 607
 608         crtc_funcs = set->crtc->helper_private;
 609
 610         if (!set->mode)
 611                 set->fb = NULL;
 612
 613         if (set->fb) {
 614                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 615                                 set->crtc->base.id, set->fb->base.id,
 616                                 (int)set->num_connectors, set->x, set->y);
 617         } else {
 618                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 619                 return drm_crtc_helper_disable(set->crtc);
 620         }
 621
 622         dev = set->crtc->dev;
 623
 624         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 625          * connector data. */
 626         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 627                              sizeof(struct drm_crtc), GFP_KERNEL);
 628         if (!save_crtcs)
 629                 return -ENOMEM;
 630
 631         save_encoders = kzalloc(dev->mode_config.num_encoder *
 632                                 sizeof(struct drm_encoder), GFP_KERNEL);
 633         if (!save_encoders) {
 634                 kfree(save_crtcs);
 635                 return -ENOMEM;
 636         }
 637
 638         save_connectors = kzalloc(dev->mode_config.num_connector *
 639                                 sizeof(struct drm_connector), GFP_KERNEL);
 640         if (!save_connectors) {
 641                 kfree(save_crtcs);
 642                 kfree(save_encoders);
 643                 return -ENOMEM;
 644         }
 645
 646         /* Copy data. Note that driver private data is not affected.
 647          * Should anything bad happen only the expected state is
 648          * restored, not the drivers personal bookkeeping.
 649          */
 650         count = 0;
 651         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 652                 save_crtcs[count++] = *crtc;
 653         }
 654
 655         count = 0;
 656         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 657                 save_encoders[count++] = *encoder;
 658         }
 659
 660         count = 0;
 661         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 662                 save_connectors[count++] = *connector;
 663         }
 664
 665         save_set.crtc = set->crtc;
 666         save_set.mode = &set->crtc->mode;
 667         save_set.x = set->crtc->x;
 668         save_set.y = set->crtc->y;
 669         save_set.fb = set->crtc->fb;
 670
 671         /* We should be able to check here if the fb has the same properties
 672          * and then just flip_or_move it */
 673         if (set->crtc->fb != set->fb) {
 674                 /* If we have no fb then treat it as a full mode set */
 675                 if (set->crtc->fb == NULL) {
 676                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 677                         mode_changed = true;
 678                 } else if (set->fb == NULL) {
 679                         mode_changed = true;
 680                 } else if (set->fb->pixel_format !=
 681                            set->crtc->fb->pixel_format) {
 682                         mode_changed = true;
 683                 } else
 684                         fb_changed = true;
 685         }
 686
 687         if (set->x != set->crtc->x || set->y != set->crtc->y)
 688                 fb_changed = true;
 689
 690         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 691                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 692                 drm_mode_debug_printmodeline(&set->crtc->mode);
 693                 drm_mode_debug_printmodeline(set->mode);
 694                 mode_changed = true;
 695         }
 696
 697         /* a) traverse passed in connector list and get encoders for them */
 698         count = 0;
 699         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 700                 struct drm_connector_helper_funcs *connector_funcs =
 701                         connector->helper_private;
 702                 new_encoder = connector->encoder;
 703                 for (ro = 0; ro < set->num_connectors; ro++) {
 704                         if (set->connectors[ro] == connector) {
 705                                 new_encoder = connector_funcs->best_encoder(connector);
 706                                 /* if we can't get an encoder for a connector
 707                                    we are setting now - then fail */
 708                                 if (new_encoder == NULL)
 709                                         /* don't break so fail path works correct */
 710                                         fail = 1;
 711                                 break;
 712
 713                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 714                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 715                                         mode_changed = true;
 716                                 }
 717                         }
 718                 }
 719
 720                 if (new_encoder != connector->encoder) {
 721                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 722                         mode_changed = true;
 723                         /* If the encoder is reused for another connector, then
 724                          * the appropriate crtc will be set later.
 725                          */
 726                         if (connector->encoder)
 727                                 connector->encoder->crtc = NULL;
 728                         connector->encoder = new_encoder;
 729                 }
 730         }
 731
 732         if (fail) {
 733                 ret = -EINVAL;
 734                 goto fail;
 735         }
 736
 737         count = 0;
 738         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 739                 if (!connector->encoder)
 740                         continue;
 741
 742                 if (connector->encoder->crtc == set->crtc)
 743                         new_crtc = NULL;
 744                 else
 745                         new_crtc = connector->encoder->crtc;
 746
 747                 for (ro = 0; ro < set->num_connectors; ro++) {
 748                         if (set->connectors[ro] == connector)
 749                                 new_crtc = set->crtc;
 750                 }
 751
 752                 /* Make sure the new CRTC will work with the encoder */
 753                 if (new_crtc &&
 754                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 755                         ret = -EINVAL;
 756                         goto fail;
 757                 }
 758                 if (new_crtc != connector->encoder->crtc) {
 759                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 760                         mode_changed = true;
 761                         connector->encoder->crtc = new_crtc;
 762                 }
 763                 if (new_crtc) {
 764                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 765                                 connector->base.id, drm_get_connector_name(connector),
 766                                 new_crtc->base.id);
 767                 } else {
 768                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 769                                 connector->base.id, drm_get_connector_name(connector));
 770                 }
 771         }
 772
 773         /* mode_set_base is not a required function */
 774         if (fb_changed && !crtc_funcs->mode_set_base)
 775                 mode_changed = true;
 776
 777         if (mode_changed) {
 778                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 779                 if (set->crtc->enabled) {
 780                         DRM_DEBUG_KMS("attempting to set mode from"
 781                                         " userspace\n");
 782                         drm_mode_debug_printmodeline(set->mode);
 783                         old_fb = set->crtc->fb;
 784                         set->crtc->fb = set->fb;
 785                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 786                                                       set->x, set->y,
 787                                                       old_fb)) {
 788                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 789                                           set->crtc->base.id);
 790                                 set->crtc->fb = old_fb;
 791                                 ret = -EINVAL;
 792                                 goto fail;
 793                         }
 794                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 795                         for (i = 0; i < set->num_connectors; i++) {
 796                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 797                                               drm_get_connector_name(set->connectors[i]));
 798                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 799                         }
 800                 }
 801                 drm_helper_disable_unused_functions(dev);
 802         } else if (fb_changed) {
 803                 set->crtc->x = set->x;
 804                 set->crtc->y = set->y;
 805
 806                 old_fb = set->crtc->fb;
 807                 if (set->crtc->fb != set->fb)
 808                         set->crtc->fb = set->fb;
 809                 ret = crtc_funcs->mode_set_base(set->crtc,
 810                                                 set->x, set->y, old_fb);
 811                 if (ret != 0) {
 812                         set->crtc->fb = old_fb;
 813                         goto fail;
 814                 }
 815         }
 816
 817         kfree(save_connectors);
 818         kfree(save_encoders);
 819         kfree(save_crtcs);
 820         return 0;
 821
 822 fail:
 823         /* Restore all previous data. */
 824         count = 0;
 825         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 826                 *crtc = save_crtcs[count++];
 827         }
 828
 829         count = 0;
 830         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 831                 *encoder = save_encoders[count++];
 832         }
 833
 834         count = 0;
 835         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 836                 *connector = save_connectors[count++];
 837         }
 838
 839         /* Try to restore the config */
 840         if (mode_changed &&
 841             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 842                                       save_set.y, save_set.fb))
 843                 DRM_ERROR("failed to restore config after modeset failure\n");
 844
 845         kfree(save_connectors);
 846         kfree(save_encoders);
 847         kfree(save_crtcs);
 848         return ret;
 849 }
 850 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 851
 852 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 853 {
 854         int dpms = DRM_MODE_DPMS_OFF;
 855         struct drm_connector *connector;
 856         struct drm_device *dev = encoder->dev;
 857
 858         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 859                 if (connector->encoder == encoder)
 860                         if (connector->dpms < dpms)
 861                                 dpms = connector->dpms;
 862         return dpms;
 863 }
 864
 865 /* Helper which handles bridge ordering around encoder dpms */
 866 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 867 {
 868         struct drm_bridge *bridge = encoder->bridge;
 869         struct drm_encoder_helper_funcs *encoder_funcs;
 870
 871         if (bridge) {
 872                 if (mode == DRM_MODE_DPMS_ON)
 873                         bridge->funcs->pre_enable(bridge);
 874                 else
 875                         bridge->funcs->disable(bridge);
 876         }
 877
 878         encoder_funcs = encoder->helper_private;
 879         if (encoder_funcs->dpms)
 880                 encoder_funcs->dpms(encoder, mode);
 881
 882         if (bridge) {
 883                 if (mode == DRM_MODE_DPMS_ON)
 884                         bridge->funcs->enable(bridge);
 885                 else
 886                         bridge->funcs->post_disable(bridge);
 887         }
 888 }
 889
 890 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 891 {
 892         int dpms = DRM_MODE_DPMS_OFF;
 893         struct drm_connector *connector;
 894         struct drm_device *dev = crtc->dev;
 895
 896         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 897                 if (connector->encoder && connector->encoder->crtc == crtc)
 898                         if (connector->dpms < dpms)
 899                                 dpms = connector->dpms;
 900         return dpms;
 901 }
 902
 903 /**
 904  * drm_helper_connector_dpms() - connector dpms helper implementation
 905  * @connector: affected connector
 906  * @mode: DPMS mode
 907  *
 908  * This is the main helper function provided by the crtc helper framework for
 909  * implementing the DPMS connector attribute. It computes the new desired DPMS
 910  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 911  * callback provided by the driver appropriately.
 912  */
 913 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 914 {
 915         struct drm_encoder *encoder = connector->encoder;
 916         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 917         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
 918
 919         if (mode == connector->dpms)
 920                 return;
 921
 922         old_dpms = connector->dpms;
 923         connector->dpms = mode;
 924
 925         if (encoder)
 926                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
 927
 928         /* from off to on, do crtc then encoder */
 929         if (mode < old_dpms) {
 930                 if (crtc) {
 931                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 932                         if (crtc_funcs->dpms)
 933                                 (*crtc_funcs->dpms) (crtc,
 934                                                      drm_helper_choose_crtc_dpms(crtc));
 935                 }
 936                 if (encoder)
 937                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 938         }
 939
 940         /* from on to off, do encoder then crtc */
 941         if (mode > old_dpms) {
 942                 if (encoder)
 943                         drm_helper_encoder_dpms(encoder, encoder_dpms);
 944                 if (crtc) {
 945                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 946                         if (crtc_funcs->dpms)
 947                                 (*crtc_funcs->dpms) (crtc,
 948                                                      drm_helper_choose_crtc_dpms(crtc));
 949                 }
 950         }
 951
 952         return;
 953 }
 954 EXPORT_SYMBOL(drm_helper_connector_dpms);
 955
 956 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 957                                    struct drm_mode_fb_cmd2 *mode_cmd)
 958 {
 959         int i;
 960
 961         fb->width = mode_cmd->width;
 962         fb->height = mode_cmd->height;
 963         for (i = 0; i < 4; i++) {
 964                 fb->pitches[i] = mode_cmd->pitches[i];
 965                 fb->offsets[i] = mode_cmd->offsets[i];
 966         }
 967         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 968                                     &fb->bits_per_pixel);
 969         fb->pixel_format = mode_cmd->pixel_format;
 970
 971         return 0;
 972 }
 973 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 974
 975 int drm_helper_resume_force_mode(struct drm_device *dev)
 976 {
 977         struct drm_crtc *crtc;
 978         struct drm_encoder *encoder;
 979         struct drm_crtc_helper_funcs *crtc_funcs;
 980         int ret, encoder_dpms;
 981
 982         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 983
 984                 if (!crtc->enabled)
 985                         continue;
 986
 987                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 988                                                crtc->x, crtc->y, crtc->fb);
 989
 990                 if (ret == false)
 991                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 992
 993                 /* Turn off outputs that were already powered off */
 994                 if (drm_helper_choose_crtc_dpms(crtc)) {
 995                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 996
 997                                 if(encoder->crtc != crtc)
 998                                         continue;
 999
1000                                 encoder_dpms = drm_helper_choose_encoder_dpms(
1001                                                         encoder);
1002
1003                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
1004                         }
1005
1006                         crtc_funcs = crtc->helper_private;
1007                         if (crtc_funcs->dpms)
1008                                 (*crtc_funcs->dpms) (crtc,
1009                                                      drm_helper_choose_crtc_dpms(crtc));
1010                 }
1011         }
1012         /* disable the unused connectors while restoring the modesetting */
1013         drm_helper_disable_unused_functions(dev);
1014         return 0;
1015 }
1016 EXPORT_SYMBOL(drm_helper_resume_force_mode);
1017
1018 void drm_kms_helper_hotplug_event(struct drm_device *dev)
1019 {
1020         /* send a uevent + call fbdev */
1021         drm_sysfs_hotplug_event(dev);
1022         if (dev->mode_config.funcs->output_poll_changed)
1023                 dev->mode_config.funcs->output_poll_changed(dev);
1024 }
1025 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1026
1027 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1028 static void output_poll_execute(struct work_struct *work)
1029 {
1030         struct delayed_work *delayed_work = to_delayed_work(work);
1031         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1032         struct drm_connector *connector;
1033         enum drm_connector_status old_status;
1034         bool repoll = false, changed = false;
1035
1036         if (!drm_kms_helper_poll)
1037                 return;
1038
1039         mutex_lock(&dev->mode_config.mutex);
1040         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1041
1042                 /* Ignore forced connectors. */
1043                 if (connector->force)
1044                         continue;
1045
1046                 /* Ignore HPD capable connectors and connectors where we don't
1047                  * want any hotplug detection at all for polling. */
1048                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1049                         continue;
1050
1051                 repoll = true;
1052
1053                 old_status = connector->status;
1054                 /* if we are connected and don't want to poll for disconnect
1055                    skip it */
1056                 if (old_status == connector_status_connected &&
1057                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1058                         continue;
1059
1060                 connector->status = connector->funcs->detect(connector, false);
1061                 if (old_status != connector->status) {
1062                         const char *old, *new;
1063
1064                         old = drm_get_connector_status_name(old_status);
1065                         new = drm_get_connector_status_name(connector->status);
1066
1067                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1068                                       "status updated from %s to %s\n",
1069                                       connector->base.id,
1070                                       drm_get_connector_name(connector),
1071                                       old, new);
1072
1073                         changed = true;
1074                 }
1075         }
1076
1077         mutex_unlock(&dev->mode_config.mutex);
1078
1079         if (changed)
1080                 drm_kms_helper_hotplug_event(dev);
1081
1082         if (repoll)
1083                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1084 }
1085
1086 void drm_kms_helper_poll_disable(struct drm_device *dev)
1087 {
1088         if (!dev->mode_config.poll_enabled)
1089                 return;
1090         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1091 }
1092 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1093
1094 void drm_kms_helper_poll_enable(struct drm_device *dev)
1095 {
1096         bool poll = false;
1097         struct drm_connector *connector;
1098
1099         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1100                 return;
1101
1102         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1103                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1104                                          DRM_CONNECTOR_POLL_DISCONNECT))
1105                         poll = true;
1106         }
1107
1108         if (poll)
1109                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1110 }
1111 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1112
1113 void drm_kms_helper_poll_init(struct drm_device *dev)
1114 {
1115         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1116         dev->mode_config.poll_enabled = true;
1117
1118         drm_kms_helper_poll_enable(dev);
1119 }
1120 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1121
1122 void drm_kms_helper_poll_fini(struct drm_device *dev)
1123 {
1124         drm_kms_helper_poll_disable(dev);
1125 }
1126 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1127
1128 void drm_helper_hpd_irq_event(struct drm_device *dev)
1129 {
1130         struct drm_connector *connector;
1131         enum drm_connector_status old_status;
1132         bool changed = false;
1133
1134         if (!dev->mode_config.poll_enabled)
1135                 return;
1136
1137         mutex_lock(&dev->mode_config.mutex);
1138         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1139
1140                 /* Only handle HPD capable connectors. */
1141                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1142                         continue;
1143
1144                 old_status = connector->status;
1145
1146                 connector->status = connector->funcs->detect(connector, false);
1147                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1148                               connector->base.id,
1149                               drm_get_connector_name(connector),
1150                               drm_get_connector_status_name(old_status),
1151                               drm_get_connector_status_name(connector->status));
1152                 if (old_status != connector->status)
1153                         changed = true;
1154         }
1155
1156         mutex_unlock(&dev->mode_config.mutex);
1157
1158         if (changed)
1159                 drm_kms_helper_hotplug_event(dev);
1160 }
1161 EXPORT_SYMBOL(drm_helper_hpd_irq_event);