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