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  * $FreeBSD: src/sys/dev/drm2/drm_crtc_helper.c,v 1.1 2012/05/22 11:07:44 kib Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <drm/drmP.h>
  37 #include <drm/drm_crtc.h>
  38 #include <uapi_drm/drm_fourcc.h>
  39 #include <drm/drm_crtc_helper.h>
  40 #include <drm/drm_fb_helper.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 static bool drm_kms_helper_poll = false; // XXX fix and reenable
  66
  67 static void drm_mode_validate_flag(struct drm_connector *connector,
  68                                    int flags)
  69 {
  70         struct drm_display_mode *mode, *t;
  71
  72         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  73                 return;
  74
  75         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  76                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  77                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  78                         mode->status = MODE_NO_INTERLACE;
  79                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  80                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  81                         mode->status = MODE_NO_DBLESCAN;
  82         }
  83
  84         return;
  85 }
  86
  87 /**
  88  * drm_helper_probe_single_connector_modes - get complete set of display modes
  89  * @dev: DRM device
  90  * @maxX: max width for modes
  91  * @maxY: max height for modes
  92  *
  93  * LOCKING:
  94  * Caller must hold mode config lock.
  95  *
  96  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  97  * modes on them.  Modes will first be added to the connector's probed_modes
  98  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  99  * put into the normal modes list.
 100  *
 101  * Intended to be used either at bootup time or when major configuration
 102  * changes have occurred.
 103  *
 104  * FIXME: take into account monitor limits
 105  *
 106  * RETURNS:
 107  * Number of modes found on @connector.
 108  */
 109 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 110                                             uint32_t maxX, uint32_t maxY)
 111 {
 112         struct drm_device *dev = connector->dev;
 113         struct drm_display_mode *mode, *t;
 114         struct drm_connector_helper_funcs *connector_funcs =
 115                 connector->helper_private;
 116         struct drm_cmdline_mode cmdline_mode;
 117         int count = 0;
 118         int mode_flags = 0;
 119
 120         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 121                         drm_get_connector_name(connector));
 122         /* set all modes to the unverified state */
 123         list_for_each_entry_safe(mode, t, &connector->modes, head)
 124                 mode->status = MODE_UNVERIFIED;
 125
 126         if (connector->force) {
 127                 if (connector->force == DRM_FORCE_ON)
 128                         connector->status = connector_status_connected;
 129                 else
 130                         connector->status = connector_status_disconnected;
 131                 if (connector->funcs->force)
 132                         connector->funcs->force(connector);
 133         } else {
 134                 connector->status = connector->funcs->detect(connector, true);
 135                 drm_kms_helper_poll_enable(dev);
 136         }
 137
 138         if (connector->status == connector_status_disconnected) {
 139                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 140                         connector->base.id, drm_get_connector_name(connector));
 141                 drm_mode_connector_update_edid_property(connector, NULL);
 142                 goto prune;
 143         }
 144
 145         count = (*connector_funcs->get_modes)(connector);
 146         if (count == 0 && drm_fetch_cmdline_mode_from_kenv(connector,
 147             &cmdline_mode)) {
 148                 mode = drm_mode_create_from_cmdline_mode(dev,
 149                     &cmdline_mode);
 150                 if (mode != NULL) {
 151                         DRM_DEBUG_KMS(
 152         "[CONNECTOR:%d:%s] found manual override ",
 153                             connector->base.id,
 154                             drm_get_connector_name(connector));
 155                         drm_mode_debug_printmodeline(mode);
 156                         drm_mode_probed_add(connector, mode);
 157                         count++;
 158                 } else {
 159                         DRM_ERROR(
 160         "[CONNECTOR:%d:%s] manual override mode: parse error\n",
 161                             connector->base.id,
 162                             drm_get_connector_name(connector));
 163                 }
 164         }
 165         if (count == 0 && connector->status == connector_status_connected)
 166                 count = drm_add_modes_noedid(connector, 1024, 768);
 167         if (count == 0)
 168                 goto prune;
 169
 170         drm_mode_connector_list_update(connector);
 171
 172         if (maxX && maxY)
 173                 drm_mode_validate_size(dev, &connector->modes, maxX,
 174                                        maxY, 0);
 175
 176         if (connector->interlace_allowed)
 177                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 178         if (connector->doublescan_allowed)
 179                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 180         drm_mode_validate_flag(connector, mode_flags);
 181
 182         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 183                 if (mode->status == MODE_OK)
 184                         mode->status = connector_funcs->mode_valid(connector,
 185                                                                    mode);
 186         }
 187
 188 prune:
 189         drm_mode_prune_invalid(dev, &connector->modes, true);
 190
 191         if (list_empty(&connector->modes))
 192                 return 0;
 193
 194         drm_mode_sort(&connector->modes);
 195
 196         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 197                         drm_get_connector_name(connector));
 198         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 199                 mode->vrefresh = drm_mode_vrefresh(mode);
 200
 201                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 202                 drm_mode_debug_printmodeline(mode);
 203         }
 204
 205         return count;
 206 }
 207
 208 /**
 209  * drm_helper_encoder_in_use - check if a given encoder is in use
 210  * @encoder: encoder to check
 211  *
 212  * LOCKING:
 213  * Caller must hold mode config lock.
 214  *
 215  * Walk @encoders's DRM device's mode_config and see if it's in use.
 216  *
 217  * RETURNS:
 218  * True if @encoder is part of the mode_config, false otherwise.
 219  */
 220 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 221 {
 222         struct drm_connector *connector;
 223         struct drm_device *dev = encoder->dev;
 224         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 225                 if (connector->encoder == encoder)
 226                         return true;
 227         return false;
 228 }
 229
 230 /**
 231  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 232  * @crtc: CRTC to check
 233  *
 234  * LOCKING:
 235  * Caller must hold mode config lock.
 236  *
 237  * Walk @crtc's DRM device's mode_config and see if it's in use.
 238  *
 239  * RETURNS:
 240  * True if @crtc is part of the mode_config, false otherwise.
 241  */
 242 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 243 {
 244         struct drm_encoder *encoder;
 245         struct drm_device *dev = crtc->dev;
 246         /* FIXME: Locking around list access? */
 247         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 248                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 249                         return true;
 250         return false;
 251 }
 252
 253 static void
 254 drm_encoder_disable(struct drm_encoder *encoder)
 255 {
 256         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 257
 258         if (encoder_funcs->disable)
 259                 (*encoder_funcs->disable)(encoder);
 260         else
 261                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 262 }
 263
 264 /**
 265  * drm_helper_disable_unused_functions - disable unused objects
 266  * @dev: DRM device
 267  *
 268  * LOCKING:
 269  * Caller must hold mode config lock.
 270  *
 271  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 272  * by calling its dpms function, which should power it off.
 273  */
 274 void drm_helper_disable_unused_functions(struct drm_device *dev)
 275 {
 276         struct drm_encoder *encoder;
 277         struct drm_connector *connector;
 278         struct drm_crtc *crtc;
 279
 280         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 281                 if (!connector->encoder)
 282                         continue;
 283                 if (connector->status == connector_status_disconnected)
 284                         connector->encoder = NULL;
 285         }
 286
 287         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 288                 if (!drm_helper_encoder_in_use(encoder)) {
 289                         drm_encoder_disable(encoder);
 290                         /* disconnector encoder from any connector */
 291                         encoder->crtc = NULL;
 292                 }
 293         }
 294
 295         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 296                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 297                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 298                 if (!crtc->enabled) {
 299                         if (crtc_funcs->disable)
 300                                 (*crtc_funcs->disable)(crtc);
 301                         else
 302                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 303                         crtc->fb = NULL;
 304                 }
 305         }
 306 }
 307
 308 /**
 309  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 310  * @encoder: encoder to test
 311  * @crtc: crtc to test
 312  *
 313  * Return false if @encoder can't be driven by @crtc, true otherwise.
 314  */
 315 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 316                                 struct drm_crtc *crtc)
 317 {
 318         struct drm_device *dev;
 319         struct drm_crtc *tmp;
 320         int crtc_mask = 1;
 321
 322         if (crtc == NULL)
 323                 kprintf("checking null crtc?\n");
 324
 325         dev = crtc->dev;
 326
 327         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 328                 if (tmp == crtc)
 329                         break;
 330                 crtc_mask <<= 1;
 331         }
 332
 333         if (encoder->possible_crtcs & crtc_mask)
 334                 return true;
 335         return false;
 336 }
 337
 338 /*
 339  * Check the CRTC we're going to map each output to vs. its current
 340  * CRTC.  If they don't match, we have to disable the output and the CRTC
 341  * since the driver will have to re-route things.
 342  */
 343 static void
 344 drm_crtc_prepare_encoders(struct drm_device *dev)
 345 {
 346         struct drm_encoder_helper_funcs *encoder_funcs;
 347         struct drm_encoder *encoder;
 348
 349         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 350                 encoder_funcs = encoder->helper_private;
 351                 /* Disable unused encoders */
 352                 if (encoder->crtc == NULL)
 353                         drm_encoder_disable(encoder);
 354                 /* Disable encoders whose CRTC is about to change */
 355                 if (encoder_funcs->get_crtc &&
 356                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 357                         drm_encoder_disable(encoder);
 358         }
 359 }
 360
 361 /**
 362  * drm_crtc_set_mode - set a mode
 363  * @crtc: CRTC to program
 364  * @mode: mode to use
 365  * @x: width of mode
 366  * @y: height of mode
 367  *
 368  * LOCKING:
 369  * Caller must hold mode config lock.
 370  *
 371  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 372  * to fixup or reject the mode prior to trying to set it.
 373  *
 374  * RETURNS:
 375  * True if the mode was set successfully, or false otherwise.
 376  */
 377 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 378                               struct drm_display_mode *mode,
 379                               int x, int y,
 380                               struct drm_framebuffer *old_fb)
 381 {
 382         struct drm_device *dev = crtc->dev;
 383         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 384         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 385         struct drm_encoder_helper_funcs *encoder_funcs;
 386         int saved_x, saved_y;
 387         struct drm_encoder *encoder;
 388         bool ret = true;
 389
 390         crtc->enabled = drm_helper_crtc_in_use(crtc);
 391         if (!crtc->enabled)
 392                 return true;
 393
 394         adjusted_mode = drm_mode_duplicate(dev, mode);
 395         if (!adjusted_mode)
 396                 return false;
 397
 398         saved_hwmode = crtc->hwmode;
 399         saved_mode = crtc->mode;
 400         saved_x = crtc->x;
 401         saved_y = crtc->y;
 402
 403         /* Update crtc values up front so the driver can rely on them for mode
 404          * setting.
 405          */
 406         crtc->mode = *mode;
 407         crtc->x = x;
 408         crtc->y = y;
 409
 410         /* Pass our mode to the connectors and the CRTC to give them a chance to
 411          * adjust it according to limitations or connector properties, and also
 412          * a chance to reject the mode entirely.
 413          */
 414         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 415
 416                 if (encoder->crtc != crtc)
 417                         continue;
 418                 encoder_funcs = encoder->helper_private;
 419                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 420                                                       adjusted_mode))) {
 421                         goto done;
 422                 }
 423         }
 424
 425         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 426                 goto done;
 427         }
 428         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 429
 430         /* Prepare the encoders and CRTCs before setting the mode. */
 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                 /* Disable the encoders as the first thing we do. */
 437                 encoder_funcs->prepare(encoder);
 438         }
 439
 440         drm_crtc_prepare_encoders(dev);
 441
 442         crtc_funcs->prepare(crtc);
 443
 444         /* Set up the DPLL and any encoders state that needs to adjust or depend
 445          * on the DPLL.
 446          */
 447         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 448         if (!ret)
 449             goto done;
 450
 451         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 452
 453                 if (encoder->crtc != crtc)
 454                         continue;
 455
 456                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 457                         encoder->base.id, drm_get_encoder_name(encoder),
 458                         mode->base.id, mode->name);
 459                 encoder_funcs = encoder->helper_private;
 460                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 461         }
 462
 463         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 464         crtc_funcs->commit(crtc);
 465
 466         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 467
 468                 if (encoder->crtc != crtc)
 469                         continue;
 470
 471                 encoder_funcs = encoder->helper_private;
 472                 encoder_funcs->commit(encoder);
 473
 474         }
 475
 476         /* Store real post-adjustment hardware mode. */
 477         crtc->hwmode = *adjusted_mode;
 478
 479         /* Calculate and store various constants which
 480          * are later needed by vblank and swap-completion
 481          * timestamping. They are derived from true hwmode.
 482          */
 483         drm_calc_timestamping_constants(crtc);
 484
 485         /* FIXME: add subpixel order */
 486 done:
 487         drm_mode_destroy(dev, adjusted_mode);
 488         if (!ret) {
 489                 crtc->hwmode = saved_hwmode;
 490                 crtc->mode = saved_mode;
 491                 crtc->x = saved_x;
 492                 crtc->y = saved_y;
 493         }
 494
 495         return ret;
 496 }
 497
 498 static int
 499 drm_crtc_helper_disable(struct drm_crtc *crtc)
 500 {
 501         struct drm_device *dev = crtc->dev;
 502         struct drm_connector *connector;
 503         struct drm_encoder *encoder;
 504
 505         /* Decouple all encoders and their attached connectors from this crtc */
 506         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 507                 if (encoder->crtc != crtc)
 508                         continue;
 509
 510                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 511                         if (connector->encoder != encoder)
 512                                 continue;
 513
 514                         connector->encoder = NULL;
 515                 }
 516         }
 517
 518         drm_helper_disable_unused_functions(dev);
 519         return 0;
 520 }
 521
 522 /**
 523  * drm_crtc_helper_set_config - set a new config from userspace
 524  * @crtc: CRTC to setup
 525  * @crtc_info: user provided configuration
 526  * @new_mode: new mode to set
 527  * @connector_set: set of connectors for the new config
 528  * @fb: new framebuffer
 529  *
 530  * LOCKING:
 531  * Caller must hold mode config lock.
 532  *
 533  * Setup a new configuration, provided by the user in @crtc_info, and enable
 534  * it.
 535  *
 536  * RETURNS:
 537  * Zero. (FIXME)
 538  */
 539 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 540 {
 541         struct drm_device *dev;
 542         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 543         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 544         struct drm_framebuffer *old_fb = NULL;
 545         bool mode_changed = false; /* if true do a full mode set */
 546         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 547         struct drm_connector *save_connectors, *connector;
 548         int count = 0, ro, fail = 0;
 549         struct drm_crtc_helper_funcs *crtc_funcs;
 550         struct drm_mode_set save_set;
 551         int ret = 0;
 552         int i;
 553
 554         DRM_DEBUG_KMS("\n");
 555
 556         if (!set)
 557                 return -EINVAL;
 558
 559         if (!set->crtc)
 560                 return -EINVAL;
 561
 562         if (!set->crtc->helper_private)
 563                 return -EINVAL;
 564
 565         crtc_funcs = set->crtc->helper_private;
 566
 567         if (!set->mode)
 568                 set->fb = NULL;
 569
 570         if (set->fb) {
 571                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 572                                 set->crtc->base.id, set->fb->base.id,
 573                                 (int)set->num_connectors, set->x, set->y);
 574         } else {
 575                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 576                 return drm_crtc_helper_disable(set->crtc);
 577         }
 578
 579         dev = set->crtc->dev;
 580
 581         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 582          * connector data. */
 583         save_crtcs = kmalloc(dev->mode_config.num_crtc * sizeof(struct drm_crtc),
 584             DRM_MEM_KMS, M_WAITOK | M_ZERO);
 585         save_encoders = kmalloc(dev->mode_config.num_encoder *
 586             sizeof(struct drm_encoder), DRM_MEM_KMS, M_WAITOK | M_ZERO);
 587         save_connectors = kmalloc(dev->mode_config.num_connector *
 588             sizeof(struct drm_connector), DRM_MEM_KMS, M_WAITOK | M_ZERO);
 589
 590         /* Copy data. Note that driver private data is not affected.
 591          * Should anything bad happen only the expected state is
 592          * restored, not the drivers personal bookkeeping.
 593          */
 594         count = 0;
 595         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 596                 save_crtcs[count++] = *crtc;
 597         }
 598
 599         count = 0;
 600         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 601                 save_encoders[count++] = *encoder;
 602         }
 603
 604         count = 0;
 605         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 606                 save_connectors[count++] = *connector;
 607         }
 608
 609         save_set.crtc = set->crtc;
 610         save_set.mode = &set->crtc->mode;
 611         save_set.x = set->crtc->x;
 612         save_set.y = set->crtc->y;
 613         save_set.fb = set->crtc->fb;
 614
 615         /* We should be able to check here if the fb has the same properties
 616          * and then just flip_or_move it */
 617         if (set->crtc->fb != set->fb) {
 618                 /* If we have no fb then treat it as a full mode set */
 619                 if (set->crtc->fb == NULL) {
 620                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 621                         mode_changed = true;
 622                 } else if (set->fb == NULL) {
 623                         mode_changed = true;
 624                 } else
 625                         fb_changed = true;
 626         }
 627
 628         if (set->x != set->crtc->x || set->y != set->crtc->y)
 629                 fb_changed = true;
 630
 631         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 632                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 633                 drm_mode_debug_printmodeline(&set->crtc->mode);
 634                 drm_mode_debug_printmodeline(set->mode);
 635                 mode_changed = true;
 636         }
 637
 638         /* a) traverse passed in connector list and get encoders for them */
 639         count = 0;
 640         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 641                 struct drm_connector_helper_funcs *connector_funcs =
 642                         connector->helper_private;
 643                 new_encoder = connector->encoder;
 644                 for (ro = 0; ro < set->num_connectors; ro++) {
 645                         if (set->connectors[ro] == connector) {
 646                                 new_encoder = connector_funcs->best_encoder(connector);
 647                                 /* if we can't get an encoder for a connector
 648                                    we are setting now - then fail */
 649                                 if (new_encoder == NULL)
 650                                         /* don't break so fail path works correct */
 651                                         fail = 1;
 652                                 break;
 653                         }
 654                 }
 655
 656                 if (new_encoder != connector->encoder) {
 657                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 658                         mode_changed = true;
 659                         /* If the encoder is reused for another connector, then
 660                          * the appropriate crtc will be set later.
 661                          */
 662                         if (connector->encoder)
 663                                 connector->encoder->crtc = NULL;
 664                         connector->encoder = new_encoder;
 665                 }
 666         }
 667
 668         if (fail) {
 669                 ret = -EINVAL;
 670                 goto fail;
 671         }
 672
 673         count = 0;
 674         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 675                 if (!connector->encoder)
 676                         continue;
 677
 678                 if (connector->encoder->crtc == set->crtc)
 679                         new_crtc = NULL;
 680                 else
 681                         new_crtc = connector->encoder->crtc;
 682
 683                 for (ro = 0; ro < set->num_connectors; ro++) {
 684                         if (set->connectors[ro] == connector)
 685                                 new_crtc = set->crtc;
 686                 }
 687
 688                 /* Make sure the new CRTC will work with the encoder */
 689                 if (new_crtc &&
 690                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 691                         ret = -EINVAL;
 692                         goto fail;
 693                 }
 694                 if (new_crtc != connector->encoder->crtc) {
 695                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 696                         mode_changed = true;
 697                         connector->encoder->crtc = new_crtc;
 698                 }
 699                 if (new_crtc) {
 700                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 701                                 connector->base.id, drm_get_connector_name(connector),
 702                                 new_crtc->base.id);
 703                 } else {
 704                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 705                                 connector->base.id, drm_get_connector_name(connector));
 706                 }
 707         }
 708
 709         /* mode_set_base is not a required function */
 710         if (fb_changed && !crtc_funcs->mode_set_base)
 711                 mode_changed = true;
 712
 713         if (mode_changed) {
 714                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 715                 if (set->crtc->enabled) {
 716                         DRM_DEBUG_KMS("attempting to set mode from"
 717                                         " userspace\n");
 718                         drm_mode_debug_printmodeline(set->mode);
 719                         old_fb = set->crtc->fb;
 720                         set->crtc->fb = set->fb;
 721                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 722                                                       set->x, set->y,
 723                                                       old_fb)) {
 724                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 725                                           set->crtc->base.id);
 726                                 set->crtc->fb = old_fb;
 727                                 ret = -EINVAL;
 728                                 goto fail;
 729                         }
 730                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 731                         for (i = 0; i < set->num_connectors; i++) {
 732                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 733                                               drm_get_connector_name(set->connectors[i]));
 734                                 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
 735                         }
 736                 }
 737                 drm_helper_disable_unused_functions(dev);
 738         } else if (fb_changed) {
 739                 set->crtc->x = set->x;
 740                 set->crtc->y = set->y;
 741
 742                 old_fb = set->crtc->fb;
 743                 if (set->crtc->fb != set->fb)
 744                         set->crtc->fb = set->fb;
 745                 ret = crtc_funcs->mode_set_base(set->crtc,
 746                                                 set->x, set->y, old_fb);
 747                 if (ret != 0) {
 748                         set->crtc->fb = old_fb;
 749                         goto fail;
 750                 }
 751         }
 752
 753         drm_free(save_connectors, DRM_MEM_KMS);
 754         drm_free(save_encoders, DRM_MEM_KMS);
 755         drm_free(save_crtcs, DRM_MEM_KMS);
 756         return 0;
 757
 758 fail:
 759         /* Restore all previous data. */
 760         count = 0;
 761         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 762                 *crtc = save_crtcs[count++];
 763         }
 764
 765         count = 0;
 766         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 767                 *encoder = save_encoders[count++];
 768         }
 769
 770         count = 0;
 771         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 772                 *connector = save_connectors[count++];
 773         }
 774
 775         /* Try to restore the config */
 776         if (mode_changed &&
 777             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 778                                       save_set.y, save_set.fb))
 779                 DRM_ERROR("failed to restore config after modeset failure\n");
 780
 781         drm_free(save_connectors, DRM_MEM_KMS);
 782         drm_free(save_encoders, DRM_MEM_KMS);
 783         drm_free(save_crtcs, DRM_MEM_KMS);
 784         return ret;
 785 }
 786
 787 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 788 {
 789         int dpms = DRM_MODE_DPMS_OFF;
 790         struct drm_connector *connector;
 791         struct drm_device *dev = encoder->dev;
 792
 793         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 794                 if (connector->encoder == encoder)
 795                         if (connector->dpms < dpms)
 796                                 dpms = connector->dpms;
 797         return dpms;
 798 }
 799
 800 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 801 {
 802         int dpms = DRM_MODE_DPMS_OFF;
 803         struct drm_connector *connector;
 804         struct drm_device *dev = crtc->dev;
 805
 806         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 807                 if (connector->encoder && connector->encoder->crtc == crtc)
 808                         if (connector->dpms < dpms)
 809                                 dpms = connector->dpms;
 810         return dpms;
 811 }
 812
 813 /**
 814  * drm_helper_connector_dpms
 815  * @connector affected connector
 816  * @mode DPMS mode
 817  *
 818  * Calls the low-level connector DPMS function, then
 819  * calls appropriate encoder and crtc DPMS functions as well
 820  */
 821 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 822 {
 823         struct drm_encoder *encoder = connector->encoder;
 824         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 825         int old_dpms;
 826
 827         if (mode == connector->dpms)
 828                 return;
 829
 830         old_dpms = connector->dpms;
 831         connector->dpms = mode;
 832
 833         /* from off to on, do crtc then encoder */
 834         if (mode < old_dpms) {
 835                 if (crtc) {
 836                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 837                         if (crtc_funcs->dpms)
 838                                 (*crtc_funcs->dpms) (crtc,
 839                                                      drm_helper_choose_crtc_dpms(crtc));
 840                 }
 841                 if (encoder) {
 842                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 843                         if (encoder_funcs->dpms)
 844                                 (*encoder_funcs->dpms) (encoder,
 845                                                         drm_helper_choose_encoder_dpms(encoder));
 846                 }
 847         }
 848
 849         /* from on to off, do encoder then crtc */
 850         if (mode > old_dpms) {
 851                 if (encoder) {
 852                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 853                         if (encoder_funcs->dpms)
 854                                 (*encoder_funcs->dpms) (encoder,
 855                                                         drm_helper_choose_encoder_dpms(encoder));
 856                 }
 857                 if (crtc) {
 858                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 859                         if (crtc_funcs->dpms)
 860                                 (*crtc_funcs->dpms) (crtc,
 861                                                      drm_helper_choose_crtc_dpms(crtc));
 862                 }
 863         }
 864
 865         return;
 866 }
 867
 868 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 869                                    struct drm_mode_fb_cmd2 *mode_cmd)
 870 {
 871         int i;
 872
 873         fb->width = mode_cmd->width;
 874         fb->height = mode_cmd->height;
 875         for (i = 0; i < 4; i++) {
 876                 fb->pitches[i] = mode_cmd->pitches[i];
 877                 fb->offsets[i] = mode_cmd->offsets[i];
 878         }
 879         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 880                                     &fb->bits_per_pixel);
 881         fb->pixel_format = mode_cmd->pixel_format;
 882
 883         return 0;
 884 }
 885
 886 int drm_helper_resume_force_mode(struct drm_device *dev)
 887 {
 888         struct drm_crtc *crtc;
 889         struct drm_encoder *encoder;
 890         struct drm_encoder_helper_funcs *encoder_funcs;
 891         struct drm_crtc_helper_funcs *crtc_funcs;
 892         int ret;
 893
 894         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 895
 896                 if (!crtc->enabled)
 897                         continue;
 898
 899                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 900                                                crtc->x, crtc->y, crtc->fb);
 901
 902                 if (!ret)
 903                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 904
 905                 /* Turn off outputs that were already powered off */
 906                 if (drm_helper_choose_crtc_dpms(crtc)) {
 907                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 908
 909                                 if(encoder->crtc != crtc)
 910                                         continue;
 911
 912                                 encoder_funcs = encoder->helper_private;
 913                                 if (encoder_funcs->dpms)
 914                                         (*encoder_funcs->dpms) (encoder,
 915                                             drm_helper_choose_encoder_dpms(encoder));
 916                         }
 917
 918                         crtc_funcs = crtc->helper_private;
 919                         if (crtc_funcs->dpms)
 920                                 (*crtc_funcs->dpms) (crtc,
 921                                     drm_helper_choose_crtc_dpms(crtc));
 922                 }
 923         }
 924         /* disable the unused connectors while restoring the modesetting */
 925         drm_helper_disable_unused_functions(dev);
 926         return 0;
 927 }
 928
 929 #define DRM_OUTPUT_POLL_PERIOD (10 * hz)
 930 static void output_poll_execute(void *ctx, int pending)
 931 {
 932         struct drm_device *dev;
 933         struct drm_connector *connector;
 934         enum drm_connector_status old_status;
 935         bool repoll = false, changed = false;
 936
 937         if (!drm_kms_helper_poll)
 938                 return;
 939
 940         dev = ctx;
 941
 942         lockmgr(&dev->mode_config.mutex, LK_EXCLUSIVE);
 943         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 944
 945                 /* if this is HPD or polled don't check it -
 946                    TV out for instance */
 947                 if (!connector->polled)
 948                         continue;
 949
 950                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
 951                     DRM_CONNECTOR_POLL_DISCONNECT))
 952                         repoll = true;
 953
 954                 old_status = connector->status;
 955                 /* if we are connected and don't want to poll for disconnect
 956                    skip it */
 957                 if (old_status == connector_status_connected &&
 958                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 959                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 960                         continue;
 961
 962                 connector->status = connector->funcs->detect(connector, false);
 963                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 964                               connector->base.id,
 965                               drm_get_connector_name(connector),
 966                               old_status, connector->status);
 967                 if (old_status != connector->status)
 968                         changed = true;
 969         }
 970
 971         lockmgr(&dev->mode_config.mutex, LK_RELEASE);
 972
 973         if (changed) {
 974 #if 0
 975                 /* send a uevent + call fbdev */
 976                 drm_sysfs_hotplug_event(dev);
 977 #endif
 978                 if (dev->mode_config.funcs->output_poll_changed)
 979                         dev->mode_config.funcs->output_poll_changed(dev);
 980         }
 981
 982         if (repoll) {
 983                 taskqueue_enqueue_timeout(taskqueue_thread[mycpuid],
 984                     &dev->mode_config.output_poll_task,
 985                     DRM_OUTPUT_POLL_PERIOD);
 986         }
 987 }
 988
 989 void drm_kms_helper_poll_disable(struct drm_device *dev)
 990 {
 991         if (!dev->mode_config.poll_enabled)
 992                 return;
 993         taskqueue_cancel_timeout(taskqueue_thread[mycpuid],
 994             &dev->mode_config.output_poll_task, NULL);
 995 }
 996
 997 void drm_kms_helper_poll_enable(struct drm_device *dev)
 998 {
 999         bool poll = false;
1000         struct drm_connector *connector;
1001
1002         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1003                 return;
1004
1005         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1006                 if (connector->polled)
1007                         poll = true;
1008         }
1009
1010         if (poll) {
1011                 taskqueue_enqueue_timeout(taskqueue_thread[mycpuid],
1012                     &dev->mode_config.output_poll_task, DRM_OUTPUT_POLL_PERIOD);
1013         }
1014 }
1015
1016 void drm_kms_helper_poll_init(struct drm_device *dev)
1017 {
1018
1019         TIMEOUT_TASK_INIT(taskqueue_thread[mycpuid], &dev->mode_config.output_poll_task,
1020             0, output_poll_execute, dev);
1021         dev->mode_config.poll_enabled = true;
1022
1023         drm_kms_helper_poll_enable(dev);
1024 }
1025
1026 void drm_kms_helper_poll_fini(struct drm_device *dev)
1027 {
1028         drm_kms_helper_poll_disable(dev);
1029 }
1030
1031 void drm_helper_hpd_irq_event(struct drm_device *dev)
1032 {
1033         if (!dev->mode_config.poll_enabled)
1034                 return;
1035
1036         /* kill timer and schedule immediate execution, this doesn't block */
1037         taskqueue_cancel_timeout(taskqueue_thread[mycpuid],
1038             &dev->mode_config.output_poll_task, NULL);
1039         if (drm_kms_helper_poll)
1040                 taskqueue_enqueue_timeout(taskqueue_thread[mycpuid],
1041                     &dev->mode_config.output_poll_task, 0);
1042 }