sys/dev/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 <uapi_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 bool
  43 drm_fetch_cmdline_mode_from_kenv(struct drm_connector *connector,
  44     struct drm_cmdline_mode *cmdline_mode)
  45 {
  46         char *tun_var_name, *tun_mode;
  47         static const char tun_prefix[] = "drm_mode.";
  48         bool res;
  49
  50         res = false;
  51         tun_var_name = kmalloc(sizeof(tun_prefix) +
  52             strlen(drm_get_connector_name(connector)), M_TEMP, M_WAITOK);
  53         strcpy(tun_var_name, tun_prefix);
  54         strcat(tun_var_name, drm_get_connector_name(connector));
  55         tun_mode = kgetenv(tun_var_name);
  56         if (tun_mode != NULL) {
  57                 res = drm_mode_parse_command_line_for_connector(tun_mode,
  58                     connector, cmdline_mode);
  59                 kfreeenv(tun_mode);
  60         }
  61         drm_free(tun_var_name, M_TEMP);
  62         return (res);
  63 }
  64
  65 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  66 MODULE_DESCRIPTION("DRM KMS helper");
  67
  68 /**
  69  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  70  *                                              connector list
  71  * @dev: drm device to operate on
  72  *
  73  * Some userspace presumes that the first connected connector is the main
  74  * display, where it's supposed to display e.g. the login screen. For
  75  * laptops, this should be the main panel. Use this function to sort all
  76  * (eDP/LVDS) panels to the front of the connector list, instead of
  77  * painstakingly trying to initialize them in the right order.
  78  */
  79 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  80 {
  81         struct drm_connector *connector, *tmp;
  82         struct list_head panel_list;
  83
  84         INIT_LIST_HEAD(&panel_list);
  85
  86         list_for_each_entry_safe(connector, tmp,
  87                                  &dev->mode_config.connector_list, head) {
  88                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  89                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  90                         list_move_tail(&connector->head, &panel_list);
  91         }
  92
  93         list_splice(&panel_list, &dev->mode_config.connector_list);
  94 }
  95 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  96
  97 static bool drm_kms_helper_poll = true;
  98 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  99
 100 static void drm_mode_validate_flag(struct drm_connector *connector,
 101                                    int flags)
 102 {
 103         struct drm_display_mode *mode;
 104
 105         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
 106                       DRM_MODE_FLAG_3D_MASK))
 107                 return;
 108
 109         list_for_each_entry(mode, &connector->modes, head) {
 110                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
 111                                 !(flags & DRM_MODE_FLAG_INTERLACE))
 112                         mode->status = MODE_NO_INTERLACE;
 113                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
 114                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
 115                         mode->status = MODE_NO_DBLESCAN;
 116                 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
 117                                 !(flags & DRM_MODE_FLAG_3D_MASK))
 118                         mode->status = MODE_NO_STEREO;
 119         }
 120
 121         return;
 122 }
 123
 124 /**
 125  * drm_helper_probe_single_connector_modes - get complete set of display modes
 126  * @connector: connector to probe
 127  * @maxX: max width for modes
 128  * @maxY: max height for modes
 129  *
 130  * LOCKING:
 131  * Caller must hold mode config lock.
 132  *
 133  * Based on the helper callbacks implemented by @connector try to detect all
 134  * valid modes.  Modes will first be added to the connector's probed_modes list,
 135  * then culled (based on validity and the @maxX, @maxY parameters) and put into
 136  * the normal modes list.
 137  *
 138  * Intended to be use as a generic implementation of the ->probe() @connector
 139  * callback for drivers that use the crtc helpers for output mode filtering and
 140  * detection.
 141  *
 142  * RETURNS:
 143  * Number of modes found on @connector.
 144  */
 145 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 146                                             uint32_t maxX, uint32_t maxY)
 147 {
 148         struct drm_device *dev = connector->dev;
 149         struct drm_display_mode *mode;
 150         struct drm_connector_helper_funcs *connector_funcs =
 151                 connector->helper_private;
 152         int count = 0;
 153         int mode_flags = 0;
 154         bool verbose_prune = true;
 155
 156         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 157                         drm_get_connector_name(connector));
 158         /* set all modes to the unverified state */
 159         list_for_each_entry(mode, &connector->modes, head)
 160                 mode->status = MODE_UNVERIFIED;
 161
 162         if (connector->force) {
 163                 if (connector->force == DRM_FORCE_ON)
 164                         connector->status = connector_status_connected;
 165                 else
 166                         connector->status = connector_status_disconnected;
 167                 if (connector->funcs->force)
 168                         connector->funcs->force(connector);
 169         } else {
 170                 connector->status = connector->funcs->detect(connector, true);
 171         }
 172
 173         /* Re-enable polling in case the global poll config changed. */
 174         if (drm_kms_helper_poll != dev->mode_config.poll_running)
 175                 drm_kms_helper_poll_enable(dev);
 176
 177         dev->mode_config.poll_running = drm_kms_helper_poll;
 178
 179         if (connector->status == connector_status_disconnected) {
 180                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 181                         connector->base.id, drm_get_connector_name(connector));
 182                 drm_mode_connector_update_edid_property(connector, NULL);
 183                 verbose_prune = false;
 184                 goto prune;
 185         }
 186
 187 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 188         count = drm_load_edid_firmware(connector);
 189         if (count == 0)
 190 #endif
 191                 count = (*connector_funcs->get_modes)(connector);
 192
 193         if (count == 0 && connector->status == connector_status_connected)
 194                 count = drm_add_modes_noedid(connector, 1024, 768);
 195         if (count == 0)
 196                 goto prune;
 197
 198         drm_mode_connector_list_update(connector);
 199
 200         if (maxX && maxY)
 201                 drm_mode_validate_size(dev, &connector->modes, maxX,
 202                                        maxY, 0);
 203
 204         if (connector->interlace_allowed)
 205                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 206         if (connector->doublescan_allowed)
 207                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 208         if (connector->stereo_allowed)
 209                 mode_flags |= DRM_MODE_FLAG_3D_MASK;
 210         drm_mode_validate_flag(connector, mode_flags);
 211
 212         list_for_each_entry(mode, &connector->modes, head) {
 213                 if (mode->status == MODE_OK)
 214                         mode->status = connector_funcs->mode_valid(connector,
 215                                                                    mode);
 216         }
 217
 218 prune:
 219         drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
 220
 221         if (list_empty(&connector->modes))
 222                 return 0;
 223
 224         list_for_each_entry(mode, &connector->modes, head)
 225                 mode->vrefresh = drm_mode_vrefresh(mode);
 226
 227         drm_mode_sort(&connector->modes);
 228
 229         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 230                         drm_get_connector_name(connector));
 231         list_for_each_entry(mode, &connector->modes, head) {
 232                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 233                 drm_mode_debug_printmodeline(mode);
 234         }
 235
 236         return count;
 237 }
 238 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 239
 240 /**
 241  * drm_helper_encoder_in_use - check if a given encoder is in use
 242  * @encoder: encoder to check
 243  *
 244  * LOCKING:
 245  * Caller must hold mode config lock.
 246  *
 247  * Walk @encoders's DRM device's mode_config and see if it's in use.
 248  *
 249  * RETURNS:
 250  * True if @encoder is part of the mode_config, false otherwise.
 251  */
 252 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 253 {
 254         struct drm_connector *connector;
 255         struct drm_device *dev = encoder->dev;
 256         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 257                 if (connector->encoder == encoder)
 258                         return true;
 259         return false;
 260 }
 261 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 262
 263 /**
 264  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 265  * @crtc: CRTC to check
 266  *
 267  * LOCKING:
 268  * Caller must hold mode config lock.
 269  *
 270  * Walk @crtc's DRM device's mode_config and see if it's in use.
 271  *
 272  * RETURNS:
 273  * True if @crtc is part of the mode_config, false otherwise.
 274  */
 275 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 276 {
 277         struct drm_encoder *encoder;
 278         struct drm_device *dev = crtc->dev;
 279         /* FIXME: Locking around list access? */
 280         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 281                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 282                         return true;
 283         return false;
 284 }
 285 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 286
 287 static void
 288 drm_encoder_disable(struct drm_encoder *encoder)
 289 {
 290         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 291
 292         if (encoder_funcs->disable)
 293                 (*encoder_funcs->disable)(encoder);
 294         else
 295                 if (encoder_funcs->dpms)
 296                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 297 }
 298
 299 /**
 300  * drm_helper_disable_unused_functions - disable unused objects
 301  * @dev: DRM device
 302  *
 303  * LOCKING:
 304  * Caller must hold mode config lock.
 305  *
 306  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 307  * by calling its dpms function, which should power it off.
 308  */
 309 void drm_helper_disable_unused_functions(struct drm_device *dev)
 310 {
 311         struct drm_encoder *encoder;
 312         struct drm_connector *connector;
 313         struct drm_crtc *crtc;
 314
 315         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 316                 if (!connector->encoder)
 317                         continue;
 318                 if (connector->status == connector_status_disconnected)
 319                         connector->encoder = NULL;
 320         }
 321
 322         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 323                 if (!drm_helper_encoder_in_use(encoder)) {
 324                         drm_encoder_disable(encoder);
 325                         /* disconnector encoder from any connector */
 326                         encoder->crtc = NULL;
 327                 }
 328         }
 329
 330         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 331                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 332                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 333                 if (!crtc->enabled) {
 334                         if (crtc_funcs->disable)
 335                                 (*crtc_funcs->disable)(crtc);
 336                         else
 337                                 if (crtc_funcs->dpms)
 338                                         (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 339                         crtc->fb = NULL;
 340                 }
 341         }
 342 }
 343 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 344
 345 /*
 346  * Check the CRTC we're going to map each output to vs. its current
 347  * CRTC.  If they don't match, we have to disable the output and the CRTC
 348  * since the driver will have to re-route things.
 349  */
 350 static void
 351 drm_crtc_prepare_encoders(struct drm_device *dev)
 352 {
 353         struct drm_encoder_helper_funcs *encoder_funcs;
 354         struct drm_encoder *encoder;
 355
 356         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 357                 encoder_funcs = encoder->helper_private;
 358                 /* Disable unused encoders */
 359                 if (encoder->crtc == NULL)
 360                         drm_encoder_disable(encoder);
 361                 /* Disable encoders whose CRTC is about to change */
 362                 if (encoder_funcs->get_crtc &&
 363                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 364                         drm_encoder_disable(encoder);
 365         }
 366 }
 367
 368 /**
 369  * drm_crtc_helper_set_mode - internal helper to set a mode
 370  * @crtc: CRTC to program
 371  * @mode: mode to use
 372  * @x: horizontal offset into the surface
 373  * @y: vertical offset into the surface
 374  * @old_fb: old framebuffer, for cleanup
 375  *
 376  * LOCKING:
 377  * Caller must hold mode config lock.
 378  *
 379  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 380  * to fixup or reject the mode prior to trying to set it. This is an internal
 381  * helper that drivers could e.g. use to update properties that require the
 382  * entire output pipe to be disabled and re-enabled in a new configuration. For
 383  * example for changing whether audio is enabled on a hdmi link or for changing
 384  * panel fitter or dither attributes. It is also called by the
 385  * drm_crtc_helper_set_config() helper function to drive the mode setting
 386  * sequence.
 387  *
 388  * RETURNS:
 389  * True if the mode was set successfully, or false otherwise.
 390  */
 391 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 392                               struct drm_display_mode *mode,
 393                               int x, int y,
 394                               struct drm_framebuffer *old_fb)
 395 {
 396         struct drm_device *dev = crtc->dev;
 397         struct drm_display_mode *adjusted_mode, saved_mode;
 398         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 399         struct drm_encoder_helper_funcs *encoder_funcs;
 400         int saved_x, saved_y;
 401         bool saved_enabled;
 402         struct drm_encoder *encoder;
 403         bool ret = true;
 404
 405         saved_enabled = crtc->enabled;
 406         crtc->enabled = drm_helper_crtc_in_use(crtc);
 407         if (!crtc->enabled)
 408                 return true;
 409
 410         adjusted_mode = drm_mode_duplicate(dev, mode);
 411         if (!adjusted_mode) {
 412                 crtc->enabled = saved_enabled;
 413                 return false;
 414         }
 415
 416         saved_mode = crtc->mode;
 417         saved_x = crtc->x;
 418         saved_y = crtc->y;
 419
 420         /* Update crtc values up front so the driver can rely on them for mode
 421          * setting.
 422          */
 423         crtc->mode = *mode;
 424         crtc->x = x;
 425         crtc->y = y;
 426
 427         /* Pass our mode to the connectors and the CRTC to give them a chance to
 428          * adjust it according to limitations or connector properties, and also
 429          * a chance to reject the mode entirely.
 430          */
 431         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 432
 433                 if (encoder->crtc != crtc)
 434                         continue;
 435                 encoder_funcs = encoder->helper_private;
 436                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 437                                                       adjusted_mode))) {
 438                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 439                         goto done;
 440                 }
 441         }
 442
 443         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 444                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 445                 goto done;
 446         }
 447         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 448
 449         /* Prepare the encoders and CRTCs before setting the mode. */
 450         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 451
 452                 if (encoder->crtc != crtc)
 453                         continue;
 454                 encoder_funcs = encoder->helper_private;
 455                 /* Disable the encoders as the first thing we do. */
 456                 encoder_funcs->prepare(encoder);
 457         }
 458
 459         drm_crtc_prepare_encoders(dev);
 460
 461         crtc_funcs->prepare(crtc);
 462
 463         /* Set up the DPLL and any encoders state that needs to adjust or depend
 464          * on the DPLL.
 465          */
 466         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 467         if (!ret)
 468             goto done;
 469
 470         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 471
 472                 if (encoder->crtc != crtc)
 473                         continue;
 474
 475                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 476                         encoder->base.id, drm_get_encoder_name(encoder),
 477                         mode->base.id, mode->name);
 478                 encoder_funcs = encoder->helper_private;
 479                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 480         }
 481
 482         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 483         crtc_funcs->commit(crtc);
 484
 485         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 486
 487                 if (encoder->crtc != crtc)
 488                         continue;
 489
 490                 encoder_funcs = encoder->helper_private;
 491                 encoder_funcs->commit(encoder);
 492
 493         }
 494
 495         /* Store real post-adjustment hardware mode. */
 496         crtc->hwmode = *adjusted_mode;
 497
 498         /* Calculate and store various constants which
 499          * are later needed by vblank and swap-completion
 500          * timestamping. They are derived from true hwmode.
 501          */
 502         drm_calc_timestamping_constants(crtc, &crtc->hwmode);
 503
 504         /* FIXME: add subpixel order */
 505 done:
 506         drm_mode_destroy(dev, adjusted_mode);
 507         if (!ret) {
 508                 crtc->enabled = saved_enabled;
 509                 crtc->mode = saved_mode;
 510                 crtc->x = saved_x;
 511                 crtc->y = saved_y;
 512         }
 513
 514         return ret;
 515 }
 516 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 517
 518
 519 static int
 520 drm_crtc_helper_disable(struct drm_crtc *crtc)
 521 {
 522         struct drm_device *dev = crtc->dev;
 523         struct drm_connector *connector;
 524         struct drm_encoder *encoder;
 525
 526         /* Decouple all encoders and their attached connectors from this crtc */
 527         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 528                 if (encoder->crtc != crtc)
 529                         continue;
 530
 531                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 532                         if (connector->encoder != encoder)
 533                                 continue;
 534
 535                         connector->encoder = NULL;
 536
 537                         /*
 538                          * drm_helper_disable_unused_functions() ought to be
 539                          * doing this, but since we've decoupled the encoder
 540                          * from the connector above, the required connection
 541                          * between them is henceforth no longer available.
 542                          */
 543                         connector->dpms = DRM_MODE_DPMS_OFF;
 544                 }
 545         }
 546
 547         drm_helper_disable_unused_functions(dev);
 548         return 0;
 549 }
 550
 551 /**
 552  * drm_crtc_helper_set_config - set a new config from userspace
 553  * @set: mode set configuration
 554  *
 555  * LOCKING:
 556  * Caller must hold mode config lock.
 557  *
 558  * Setup a new configuration, provided by the upper layers (either an ioctl call
 559  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 560  * enable it. This is the main helper functions for drivers that implement
 561  * kernel mode setting with the crtc helper functions and the assorted
 562  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 563  *
 564  * RETURNS:
 565  * Returns 0 on success, -ERRNO on failure.
 566  */
 567 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 568 {
 569         struct drm_device *dev;
 570         struct drm_crtc *new_crtc;
 571         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 572         bool mode_changed = false; /* if true do a full mode set */
 573         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 574         struct drm_connector *save_connectors, *connector;
 575         int count = 0, ro, fail = 0;
 576         struct drm_crtc_helper_funcs *crtc_funcs;
 577         struct drm_mode_set save_set;
 578         int ret;
 579         int i;
 580
 581         DRM_DEBUG_KMS("\n");
 582
 583         BUG_ON(!set);
 584         BUG_ON(!set->crtc);
 585         BUG_ON(!set->crtc->helper_private);
 586
 587         /* Enforce sane interface api - has been abused by the fb helper. */
 588         BUG_ON(!set->mode && set->fb);
 589         BUG_ON(set->fb && set->num_connectors == 0);
 590
 591         crtc_funcs = set->crtc->helper_private;
 592
 593         if (!set->mode)
 594                 set->fb = NULL;
 595
 596         if (set->fb) {
 597                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 598                                 set->crtc->base.id, set->fb->base.id,
 599                                 (int)set->num_connectors, set->x, set->y);
 600         } else {
 601                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 602                 return drm_crtc_helper_disable(set->crtc);
 603         }
 604
 605         dev = set->crtc->dev;
 606
 607         /*
 608          * Allocate space for the backup of all (non-pointer) encoder and
 609          * connector data.
 610          */
 611         save_encoders = kzalloc(dev->mode_config.num_encoder *
 612                                 sizeof(struct drm_encoder), GFP_KERNEL);
 613         if (!save_encoders)
 614                 return -ENOMEM;
 615
 616         save_connectors = kzalloc(dev->mode_config.num_connector *
 617                                 sizeof(struct drm_connector), GFP_KERNEL);
 618         if (!save_connectors) {
 619                 kfree(save_encoders);
 620                 return -ENOMEM;
 621         }
 622
 623         /*
 624          * Copy data. Note that driver private data is not affected.
 625          * Should anything bad happen only the expected state is
 626          * restored, not the drivers personal bookkeeping.
 627          */
 628         count = 0;
 629         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 630                 save_encoders[count++] = *encoder;
 631         }
 632
 633         count = 0;
 634         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 635                 save_connectors[count++] = *connector;
 636         }
 637
 638         save_set.crtc = set->crtc;
 639         save_set.mode = &set->crtc->mode;
 640         save_set.x = set->crtc->x;
 641         save_set.y = set->crtc->y;
 642         save_set.fb = set->crtc->fb;
 643
 644         /* We should be able to check here if the fb has the same properties
 645          * and then just flip_or_move it */
 646         if (set->crtc->fb != set->fb) {
 647                 /* If we have no fb then treat it as a full mode set */
 648                 if (set->crtc->fb == NULL) {
 649                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 650                         mode_changed = true;
 651                 } else if (set->fb == NULL) {
 652                         mode_changed = true;
 653                 } else if (set->fb->pixel_format !=
 654                            set->crtc->fb->pixel_format) {
 655                         mode_changed = true;
 656                 } else
 657                         fb_changed = true;
 658         }
 659
 660         if (set->x != set->crtc->x || set->y != set->crtc->y)
 661                 fb_changed = true;
 662
 663         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 664                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 665                 drm_mode_debug_printmodeline(&set->crtc->mode);
 666                 drm_mode_debug_printmodeline(set->mode);
 667                 mode_changed = true;
 668         }
 669
 670         /* a) traverse passed in connector list and get encoders for them */
 671         count = 0;
 672         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 673                 struct drm_connector_helper_funcs *connector_funcs =
 674                         connector->helper_private;
 675                 new_encoder = connector->encoder;
 676                 for (ro = 0; ro < set->num_connectors; ro++) {
 677                         if (set->connectors[ro] == connector) {
 678                                 new_encoder = connector_funcs->best_encoder(connector);
 679                                 /* if we can't get an encoder for a connector
 680                                    we are setting now - then fail */
 681                                 if (new_encoder == NULL)
 682                                         /* don't break so fail path works correct */
 683                                         fail = 1;
 684                                 break;
 685
 686                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
 687                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
 688                                         mode_changed = true;
 689                                 }
 690                         }
 691                 }
 692
 693                 if (new_encoder != connector->encoder) {
 694                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 695                         mode_changed = true;
 696                         /* If the encoder is reused for another connector, then
 697                          * the appropriate crtc will be set later.
 698                          */
 699                         if (connector->encoder)
 700                                 connector->encoder->crtc = NULL;
 701                         connector->encoder = new_encoder;
 702                 }
 703         }
 704
 705         if (fail) {
 706                 ret = -EINVAL;
 707                 goto fail;
 708         }
 709
 710         count = 0;
 711         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 712                 if (!connector->encoder)
 713                         continue;
 714
 715                 if (connector->encoder->crtc == set->crtc)
 716                         new_crtc = NULL;
 717                 else
 718                         new_crtc = connector->encoder->crtc;
 719
 720                 for (ro = 0; ro < set->num_connectors; ro++) {
 721                         if (set->connectors[ro] == connector)
 722                                 new_crtc = set->crtc;
 723                 }
 724
 725                 /* Make sure the new CRTC will work with the encoder */
 726                 if (new_crtc &&
 727                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 728                         ret = -EINVAL;
 729                         goto fail;
 730                 }
 731                 if (new_crtc != connector->encoder->crtc) {
 732                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 733                         mode_changed = true;
 734                         connector->encoder->crtc = new_crtc;
 735                 }
 736                 if (new_crtc) {
 737                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 738                                 connector->base.id, drm_get_connector_name(connector),
 739                                 new_crtc->base.id);
 740                 } else {
 741                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 742                                 connector->base.id, drm_get_connector_name(connector));
 743                 }
 744         }
 745
 746         /* mode_set_base is not a required function */
 747         if (fb_changed && !crtc_funcs->mode_set_base)
 748                 mode_changed = true;
 749
 750         if (mode_changed) {
 751                 if (drm_helper_crtc_in_use(set->crtc)) {
 752                         DRM_DEBUG_KMS("attempting to set mode from"
 753                                         " userspace\n");
 754                         drm_mode_debug_printmodeline(set->mode);
 755                         set->crtc->fb = set->fb;
 756                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 757                                                       set->x, set->y,
 758                                                       save_set.fb)) {
 759                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 760                                           set->crtc->base.id);
 761                                 set->crtc->fb = save_set.fb;
 762                                 ret = -EINVAL;
 763                                 goto fail;
 764                         }
 765                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 766                         for (i = 0; i < set->num_connectors; i++) {
 767                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 768                                               drm_get_connector_name(set->connectors[i]));
 769                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 770                         }
 771                 }
 772                 drm_helper_disable_unused_functions(dev);
 773         } else if (fb_changed) {
 774                 set->crtc->x = set->x;
 775                 set->crtc->y = set->y;
 776                 set->crtc->fb = set->fb;
 777                 ret = crtc_funcs->mode_set_base(set->crtc,
 778                                                 set->x, set->y, save_set.fb);
 779                 if (ret != 0) {
 780                         set->crtc->x = save_set.x;
 781                         set->crtc->y = save_set.y;
 782                         set->crtc->fb = save_set.fb;
 783                         goto fail;
 784                 }
 785         }
 786
 787         kfree(save_connectors);
 788         kfree(save_encoders);
 789         return 0;
 790
 791 fail:
 792         /* Restore all previous data. */
 793         count = 0;
 794         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 795                 *encoder = save_encoders[count++];
 796         }
 797
 798         count = 0;
 799         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 800                 *connector = save_connectors[count++];
 801         }
 802
 803         /* Try to restore the config */
 804         if (mode_changed &&
 805             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 806                                       save_set.y, save_set.fb))
 807                 DRM_ERROR("failed to restore config after modeset failure\n");
 808
 809         kfree(save_connectors);
 810         kfree(save_encoders);
 811         return ret;
 812 }
 813 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 814
 815 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 816 {
 817         int dpms = DRM_MODE_DPMS_OFF;
 818         struct drm_connector *connector;
 819         struct drm_device *dev = encoder->dev;
 820
 821         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 822                 if (connector->encoder == encoder)
 823                         if (connector->dpms < dpms)
 824                                 dpms = connector->dpms;
 825         return dpms;
 826 }
 827
 828 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 829 {
 830         int dpms = DRM_MODE_DPMS_OFF;
 831         struct drm_connector *connector;
 832         struct drm_device *dev = crtc->dev;
 833
 834         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 835                 if (connector->encoder && connector->encoder->crtc == crtc)
 836                         if (connector->dpms < dpms)
 837                                 dpms = connector->dpms;
 838         return dpms;
 839 }
 840
 841 /**
 842  * drm_helper_connector_dpms() - connector dpms helper implementation
 843  * @connector: affected connector
 844  * @mode: DPMS mode
 845  *
 846  * This is the main helper function provided by the crtc helper framework for
 847  * implementing the DPMS connector attribute. It computes the new desired DPMS
 848  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 849  * callback provided by the driver appropriately.
 850  */
 851 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 852 {
 853         struct drm_encoder *encoder = connector->encoder;
 854         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 855         int old_dpms;
 856
 857         if (mode == connector->dpms)
 858                 return;
 859
 860         old_dpms = connector->dpms;
 861         connector->dpms = mode;
 862
 863         /* from off to on, do crtc then encoder */
 864         if (mode < old_dpms) {
 865                 if (crtc) {
 866                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 867                         if (crtc_funcs->dpms)
 868                                 (*crtc_funcs->dpms) (crtc,
 869                                                      drm_helper_choose_crtc_dpms(crtc));
 870                 }
 871                 if (encoder) {
 872                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 873                         if (encoder_funcs->dpms)
 874                                 (*encoder_funcs->dpms) (encoder,
 875                                                         drm_helper_choose_encoder_dpms(encoder));
 876                 }
 877         }
 878
 879         /* from on to off, do encoder then crtc */
 880         if (mode > old_dpms) {
 881                 if (encoder) {
 882                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 883                         if (encoder_funcs->dpms)
 884                                 (*encoder_funcs->dpms) (encoder,
 885                                                         drm_helper_choose_encoder_dpms(encoder));
 886                 }
 887                 if (crtc) {
 888                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 889                         if (crtc_funcs->dpms)
 890                                 (*crtc_funcs->dpms) (crtc,
 891                                                      drm_helper_choose_crtc_dpms(crtc));
 892                 }
 893         }
 894
 895         return;
 896 }
 897 EXPORT_SYMBOL(drm_helper_connector_dpms);
 898
 899 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 900                                    struct drm_mode_fb_cmd2 *mode_cmd)
 901 {
 902         int i;
 903
 904         fb->width = mode_cmd->width;
 905         fb->height = mode_cmd->height;
 906         for (i = 0; i < 4; i++) {
 907                 fb->pitches[i] = mode_cmd->pitches[i];
 908                 fb->offsets[i] = mode_cmd->offsets[i];
 909         }
 910         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 911                                     &fb->bits_per_pixel);
 912         fb->pixel_format = mode_cmd->pixel_format;
 913
 914         return 0;
 915 }
 916 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 917
 918 int drm_helper_resume_force_mode(struct drm_device *dev)
 919 {
 920         struct drm_crtc *crtc;
 921         struct drm_encoder *encoder;
 922         struct drm_encoder_helper_funcs *encoder_funcs;
 923         struct drm_crtc_helper_funcs *crtc_funcs;
 924         int ret;
 925
 926         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 927
 928                 if (!crtc->enabled)
 929                         continue;
 930
 931                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 932                                                crtc->x, crtc->y, crtc->fb);
 933
 934                 if (ret == false)
 935                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 936
 937                 /* Turn off outputs that were already powered off */
 938                 if (drm_helper_choose_crtc_dpms(crtc)) {
 939                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 940
 941                                 if(encoder->crtc != crtc)
 942                                         continue;
 943
 944                                 encoder_funcs = encoder->helper_private;
 945                                 if (encoder_funcs->dpms)
 946                                         (*encoder_funcs->dpms) (encoder,
 947                                                                 drm_helper_choose_encoder_dpms(encoder));
 948                         }
 949
 950                         crtc_funcs = crtc->helper_private;
 951                         if (crtc_funcs->dpms)
 952                                 (*crtc_funcs->dpms) (crtc,
 953                                                      drm_helper_choose_crtc_dpms(crtc));
 954                 }
 955         }
 956         /* disable the unused connectors while restoring the modesetting */
 957         drm_helper_disable_unused_functions(dev);
 958         return 0;
 959 }
 960 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 961
 962 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 963 {
 964         /* send a uevent + call fbdev */
 965 #if 0
 966         drm_sysfs_hotplug_event(dev);
 967 #endif
 968         if (dev->mode_config.funcs->output_poll_changed)
 969                 dev->mode_config.funcs->output_poll_changed(dev);
 970 }
 971 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
 972
 973 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
 974 static void output_poll_execute(struct work_struct *work)
 975 {
 976         struct delayed_work *delayed_work = to_delayed_work(work);
 977         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
 978         struct drm_connector *connector;
 979         enum drm_connector_status old_status;
 980         bool repoll = false, changed = false;
 981
 982         if (!drm_kms_helper_poll)
 983                 return;
 984
 985         mutex_lock(&dev->mode_config.mutex);
 986         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 987
 988                 /* Ignore forced connectors. */
 989                 if (connector->force)
 990                         continue;
 991
 992                 /* Ignore HPD capable connectors and connectors where we don't
 993                  * want any hotplug detection at all for polling. */
 994                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
 995                         continue;
 996
 997                 repoll = true;
 998
 999                 old_status = connector->status;
1000                 /* if we are connected and don't want to poll for disconnect
1001                    skip it */
1002                 if (old_status == connector_status_connected &&
1003                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1004                         continue;
1005
1006                 connector->status = connector->funcs->detect(connector, false);
1007                 if (old_status != connector->status) {
1008                         const char *old, *new;
1009
1010                         old = drm_get_connector_status_name(old_status);
1011                         new = drm_get_connector_status_name(connector->status);
1012
1013                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1014                                       "status updated from %s to %s\n",
1015                                       connector->base.id,
1016                                       drm_get_connector_name(connector),
1017                                       old, new);
1018
1019                         changed = true;
1020                 }
1021         }
1022
1023         mutex_unlock(&dev->mode_config.mutex);
1024
1025         if (changed)
1026                 drm_kms_helper_hotplug_event(dev);
1027
1028         if (repoll)
1029                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1030 }
1031
1032 void drm_kms_helper_poll_disable(struct drm_device *dev)
1033 {
1034         if (!dev->mode_config.poll_enabled)
1035                 return;
1036         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1037 }
1038 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1039
1040 void drm_kms_helper_poll_enable(struct drm_device *dev)
1041 {
1042         bool poll = false;
1043         struct drm_connector *connector;
1044
1045         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1046                 return;
1047
1048         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1049                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1050                                          DRM_CONNECTOR_POLL_DISCONNECT))
1051                         poll = true;
1052         }
1053
1054         if (poll)
1055                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1056 }
1057 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1058
1059 void drm_kms_helper_poll_init(struct drm_device *dev)
1060 {
1061         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1062         dev->mode_config.poll_enabled = true;
1063
1064         drm_kms_helper_poll_enable(dev);
1065 }
1066 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1067
1068 void drm_kms_helper_poll_fini(struct drm_device *dev)
1069 {
1070         drm_kms_helper_poll_disable(dev);
1071 }
1072 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1073
1074 bool drm_helper_hpd_irq_event(struct drm_device *dev)
1075 {
1076         struct drm_connector *connector;
1077         enum drm_connector_status old_status;
1078         bool changed = false;
1079
1080         if (!dev->mode_config.poll_enabled)
1081                 return false;
1082
1083         mutex_lock(&dev->mode_config.mutex);
1084         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1085
1086                 /* Only handle HPD capable connectors. */
1087                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1088                         continue;
1089
1090                 old_status = connector->status;
1091
1092                 connector->status = connector->funcs->detect(connector, false);
1093                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1094                               connector->base.id,
1095                               drm_get_connector_name(connector),
1096                               drm_get_connector_status_name(old_status),
1097                               drm_get_connector_status_name(connector->status));
1098                 if (old_status != connector->status)
1099                         changed = true;
1100         }
1101
1102         mutex_unlock(&dev->mode_config.mutex);
1103
1104         if (changed)
1105                 drm_kms_helper_hotplug_event(dev);
1106
1107         return changed;
1108 }
1109 EXPORT_SYMBOL(drm_helper_hpd_irq_event);