drivers/gpu/drm/drm_crtc_helper.c

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