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 "drmP.h"
  33 #include "drm_crtc.h"
  34 #include "drm_crtc_helper.h"
  35
  36 static void drm_mode_validate_flag(struct drm_connector *connector,
  37                                    int flags)
  38 {
  39         struct drm_display_mode *mode, *t;
  40
  41         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  42                 return;
  43
  44         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  45                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  46                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  47                         mode->status = MODE_NO_INTERLACE;
  48                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  49                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  50                         mode->status = MODE_NO_DBLESCAN;
  51         }
  52
  53         return;
  54 }
  55
  56 /**
  57  * drm_helper_probe_connector_modes - get complete set of display modes
  58  * @dev: DRM device
  59  * @maxX: max width for modes
  60  * @maxY: max height for modes
  61  *
  62  * LOCKING:
  63  * Caller must hold mode config lock.
  64  *
  65  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  66  * modes on them.  Modes will first be added to the connector's probed_modes
  67  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  68  * put into the normal modes list.
  69  *
  70  * Intended to be used either at bootup time or when major configuration
  71  * changes have occurred.
  72  *
  73  * FIXME: take into account monitor limits
  74  *
  75  * RETURNS:
  76  * Number of modes found on @connector.
  77  */
  78 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  79                                             uint32_t maxX, uint32_t maxY)
  80 {
  81         struct drm_device *dev = connector->dev;
  82         struct drm_display_mode *mode, *t;
  83         struct drm_connector_helper_funcs *connector_funcs =
  84                 connector->helper_private;
  85         int count = 0;
  86         int mode_flags = 0;
  87
  88         DRM_DEBUG_KMS("%s\n", drm_get_connector_name(connector));
  89         /* set all modes to the unverified state */
  90         list_for_each_entry_safe(mode, t, &connector->modes, head)
  91                 mode->status = MODE_UNVERIFIED;
  92
  93         connector->status = connector->funcs->detect(connector);
  94
  95         if (connector->status == connector_status_disconnected) {
  96                 DRM_DEBUG_KMS("%s is disconnected\n",
  97                           drm_get_connector_name(connector));
  98                 goto prune;
  99         }
 100
 101         count = (*connector_funcs->get_modes)(connector);
 102         if (!count) {
 103                 count = drm_add_modes_noedid(connector, 800, 600);
 104                 if (!count)
 105                         return 0;
 106         }
 107
 108         drm_mode_connector_list_update(connector);
 109
 110         if (maxX && maxY)
 111                 drm_mode_validate_size(dev, &connector->modes, maxX,
 112                                        maxY, 0);
 113
 114         if (connector->interlace_allowed)
 115                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 116         if (connector->doublescan_allowed)
 117                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 118         drm_mode_validate_flag(connector, mode_flags);
 119
 120         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 121                 if (mode->status == MODE_OK)
 122                         mode->status = connector_funcs->mode_valid(connector,
 123                                                                    mode);
 124         }
 125
 126 prune:
 127         drm_mode_prune_invalid(dev, &connector->modes, true);
 128
 129         if (list_empty(&connector->modes))
 130                 return 0;
 131
 132         drm_mode_sort(&connector->modes);
 133
 134         DRM_DEBUG_KMS("Probed modes for %s\n",
 135                                 drm_get_connector_name(connector));
 136         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 137                 mode->vrefresh = drm_mode_vrefresh(mode);
 138
 139                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 140                 drm_mode_debug_printmodeline(mode);
 141         }
 142
 143         return count;
 144 }
 145 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 146
 147 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
 148                                       uint32_t maxY)
 149 {
 150         struct drm_connector *connector;
 151         int count = 0;
 152
 153         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 154                 count += drm_helper_probe_single_connector_modes(connector,
 155                                                                  maxX, maxY);
 156         }
 157
 158         return count;
 159 }
 160 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
 161
 162 /**
 163  * drm_helper_encoder_in_use - check if a given encoder is in use
 164  * @encoder: encoder to check
 165  *
 166  * LOCKING:
 167  * Caller must hold mode config lock.
 168  *
 169  * Walk @encoders's DRM device's mode_config and see if it's in use.
 170  *
 171  * RETURNS:
 172  * True if @encoder is part of the mode_config, false otherwise.
 173  */
 174 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 175 {
 176         struct drm_connector *connector;
 177         struct drm_device *dev = encoder->dev;
 178         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 179                 if (connector->encoder == encoder)
 180                         return true;
 181         return false;
 182 }
 183 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 184
 185 /**
 186  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 187  * @crtc: CRTC to check
 188  *
 189  * LOCKING:
 190  * Caller must hold mode config lock.
 191  *
 192  * Walk @crtc's DRM device's mode_config and see if it's in use.
 193  *
 194  * RETURNS:
 195  * True if @crtc is part of the mode_config, false otherwise.
 196  */
 197 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 198 {
 199         struct drm_encoder *encoder;
 200         struct drm_device *dev = crtc->dev;
 201         /* FIXME: Locking around list access? */
 202         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 203                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 204                         return true;
 205         return false;
 206 }
 207 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 208
 209 /**
 210  * drm_disable_unused_functions - disable unused objects
 211  * @dev: DRM device
 212  *
 213  * LOCKING:
 214  * Caller must hold mode config lock.
 215  *
 216  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 217  * by calling its dpms function, which should power it off.
 218  */
 219 void drm_helper_disable_unused_functions(struct drm_device *dev)
 220 {
 221         struct drm_encoder *encoder;
 222         struct drm_connector *connector;
 223         struct drm_encoder_helper_funcs *encoder_funcs;
 224         struct drm_crtc *crtc;
 225
 226         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 227                 if (!connector->encoder)
 228                         continue;
 229                 if (connector->status == connector_status_disconnected)
 230                         connector->encoder = NULL;
 231         }
 232
 233         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 234                 encoder_funcs = encoder->helper_private;
 235                 if (!drm_helper_encoder_in_use(encoder)) {
 236                         if (encoder_funcs->disable)
 237                                 (*encoder_funcs->disable)(encoder);
 238                         else
 239                                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 240                         /* disconnector encoder from any connector */
 241                         encoder->crtc = NULL;
 242                 }
 243         }
 244
 245         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 246                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 247                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 248                 if (!crtc->enabled) {
 249                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 250                         crtc->fb = NULL;
 251                 }
 252         }
 253 }
 254 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 255
 256 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 257 {
 258         struct drm_display_mode *mode;
 259
 260         list_for_each_entry(mode, &connector->modes, head) {
 261                 if (drm_mode_width(mode) > width ||
 262                     drm_mode_height(mode) > height)
 263                         continue;
 264                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 265                         return mode;
 266         }
 267         return NULL;
 268 }
 269
 270 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 271 {
 272         bool enable;
 273
 274         if (strict) {
 275                 enable = connector->status == connector_status_connected;
 276         } else {
 277                 enable = connector->status != connector_status_disconnected;
 278         }
 279         return enable;
 280 }
 281
 282 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 283 {
 284         bool any_enabled = false;
 285         struct drm_connector *connector;
 286         int i = 0;
 287
 288         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 289                 enabled[i] = drm_connector_enabled(connector, true);
 290                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
 291                           enabled[i] ? "yes" : "no");
 292                 any_enabled |= enabled[i];
 293                 i++;
 294         }
 295
 296         if (any_enabled)
 297                 return;
 298
 299         i = 0;
 300         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 301                 enabled[i] = drm_connector_enabled(connector, false);
 302                 i++;
 303         }
 304 }
 305
 306 static bool drm_target_preferred(struct drm_device *dev,
 307                                  struct drm_display_mode **modes,
 308                                  bool *enabled, int width, int height)
 309 {
 310         struct drm_connector *connector;
 311         int i = 0;
 312
 313         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 314
 315                 if (enabled[i] == false) {
 316                         i++;
 317                         continue;
 318                 }
 319
 320                 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 321                           connector->base.id);
 322
 323                 modes[i] = drm_has_preferred_mode(connector, width, height);
 324                 /* No preferred modes, pick one off the list */
 325                 if (!modes[i] && !list_empty(&connector->modes)) {
 326                         list_for_each_entry(modes[i], &connector->modes, head)
 327                                 break;
 328                 }
 329                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
 330                           "none");
 331                 i++;
 332         }
 333         return true;
 334 }
 335
 336 static int drm_pick_crtcs(struct drm_device *dev,
 337                           struct drm_crtc **best_crtcs,
 338                           struct drm_display_mode **modes,
 339                           int n, int width, int height)
 340 {
 341         int c, o;
 342         struct drm_connector *connector;
 343         struct drm_connector_helper_funcs *connector_funcs;
 344         struct drm_encoder *encoder;
 345         struct drm_crtc *best_crtc;
 346         int my_score, best_score, score;
 347         struct drm_crtc **crtcs, *crtc;
 348
 349         if (n == dev->mode_config.num_connector)
 350                 return 0;
 351         c = 0;
 352         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 353                 if (c == n)
 354                         break;
 355                 c++;
 356         }
 357
 358         best_crtcs[n] = NULL;
 359         best_crtc = NULL;
 360         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 361         if (modes[n] == NULL)
 362                 return best_score;
 363
 364         crtcs = kmalloc(dev->mode_config.num_connector *
 365                         sizeof(struct drm_crtc *), GFP_KERNEL);
 366         if (!crtcs)
 367                 return best_score;
 368
 369         my_score = 1;
 370         if (connector->status == connector_status_connected)
 371                 my_score++;
 372         if (drm_has_preferred_mode(connector, width, height))
 373                 my_score++;
 374
 375         connector_funcs = connector->helper_private;
 376         encoder = connector_funcs->best_encoder(connector);
 377         if (!encoder)
 378                 goto out;
 379
 380         connector->encoder = encoder;
 381
 382         /* select a crtc for this connector and then attempt to configure
 383            remaining connectors */
 384         c = 0;
 385         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 386
 387                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
 388                         c++;
 389                         continue;
 390                 }
 391
 392                 for (o = 0; o < n; o++)
 393                         if (best_crtcs[o] == crtc)
 394                                 break;
 395
 396                 if (o < n) {
 397                         /* ignore cloning for now */
 398                         c++;
 399                         continue;
 400                 }
 401
 402                 crtcs[n] = crtc;
 403                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 404                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
 405                                                   width, height);
 406                 if (score > best_score) {
 407                         best_crtc = crtc;
 408                         best_score = score;
 409                         memcpy(best_crtcs, crtcs,
 410                                dev->mode_config.num_connector *
 411                                sizeof(struct drm_crtc *));
 412                 }
 413                 c++;
 414         }
 415 out:
 416         kfree(crtcs);
 417         return best_score;
 418 }
 419
 420 static void drm_setup_crtcs(struct drm_device *dev)
 421 {
 422         struct drm_crtc **crtcs;
 423         struct drm_display_mode **modes;
 424         struct drm_encoder *encoder;
 425         struct drm_connector *connector;
 426         bool *enabled;
 427         int width, height;
 428         int i, ret;
 429
 430         DRM_DEBUG_KMS("\n");
 431
 432         width = dev->mode_config.max_width;
 433         height = dev->mode_config.max_height;
 434
 435         /* clean out all the encoder/crtc combos */
 436         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 437                 encoder->crtc = NULL;
 438         }
 439
 440         crtcs = kcalloc(dev->mode_config.num_connector,
 441                         sizeof(struct drm_crtc *), GFP_KERNEL);
 442         modes = kcalloc(dev->mode_config.num_connector,
 443                         sizeof(struct drm_display_mode *), GFP_KERNEL);
 444         enabled = kcalloc(dev->mode_config.num_connector,
 445                           sizeof(bool), GFP_KERNEL);
 446
 447         drm_enable_connectors(dev, enabled);
 448
 449         ret = drm_target_preferred(dev, modes, enabled, width, height);
 450         if (!ret)
 451                 DRM_ERROR("Unable to find initial modes\n");
 452
 453         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
 454
 455         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 456
 457         i = 0;
 458         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 459                 struct drm_display_mode *mode = modes[i];
 460                 struct drm_crtc *crtc = crtcs[i];
 461
 462                 if (connector->encoder == NULL) {
 463                         i++;
 464                         continue;
 465                 }
 466
 467                 if (mode && crtc) {
 468                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
 469                                   mode->name, crtc->base.id);
 470                         crtc->desired_mode = mode;
 471                         connector->encoder->crtc = crtc;
 472                 } else {
 473                         connector->encoder->crtc = NULL;
 474                         connector->encoder = NULL;
 475                 }
 476                 i++;
 477         }
 478
 479         kfree(crtcs);
 480         kfree(modes);
 481         kfree(enabled);
 482 }
 483
 484 /**
 485  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 486  * @encoder: encoder to test
 487  * @crtc: crtc to test
 488  *
 489  * Return false if @encoder can't be driven by @crtc, true otherwise.
 490  */
 491 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 492                                 struct drm_crtc *crtc)
 493 {
 494         struct drm_device *dev;
 495         struct drm_crtc *tmp;
 496         int crtc_mask = 1;
 497
 498         WARN(!crtc, "checking null crtc?");
 499
 500         dev = crtc->dev;
 501
 502         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 503                 if (tmp == crtc)
 504                         break;
 505                 crtc_mask <<= 1;
 506         }
 507
 508         if (encoder->possible_crtcs & crtc_mask)
 509                 return true;
 510         return false;
 511 }
 512
 513 /*
 514  * Check the CRTC we're going to map each output to vs. its current
 515  * CRTC.  If they don't match, we have to disable the output and the CRTC
 516  * since the driver will have to re-route things.
 517  */
 518 static void
 519 drm_crtc_prepare_encoders(struct drm_device *dev)
 520 {
 521         struct drm_encoder_helper_funcs *encoder_funcs;
 522         struct drm_encoder *encoder;
 523
 524         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 525                 encoder_funcs = encoder->helper_private;
 526                 /* Disable unused encoders */
 527                 if (encoder->crtc == NULL)
 528                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 529                 /* Disable encoders whose CRTC is about to change */
 530                 if (encoder_funcs->get_crtc &&
 531                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 532                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 533         }
 534 }
 535
 536 /**
 537  * drm_crtc_set_mode - set a mode
 538  * @crtc: CRTC to program
 539  * @mode: mode to use
 540  * @x: width of mode
 541  * @y: height of mode
 542  *
 543  * LOCKING:
 544  * Caller must hold mode config lock.
 545  *
 546  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 547  * to fixup or reject the mode prior to trying to set it.
 548  *
 549  * RETURNS:
 550  * True if the mode was set successfully, or false otherwise.
 551  */
 552 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 553                               struct drm_display_mode *mode,
 554                               int x, int y,
 555                               struct drm_framebuffer *old_fb)
 556 {
 557         struct drm_device *dev = crtc->dev;
 558         struct drm_display_mode *adjusted_mode, saved_mode;
 559         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 560         struct drm_encoder_helper_funcs *encoder_funcs;
 561         int saved_x, saved_y;
 562         struct drm_encoder *encoder;
 563         bool ret = true;
 564
 565         adjusted_mode = drm_mode_duplicate(dev, mode);
 566
 567         crtc->enabled = drm_helper_crtc_in_use(crtc);
 568
 569         if (!crtc->enabled)
 570                 return true;
 571
 572         saved_mode = crtc->mode;
 573         saved_x = crtc->x;
 574         saved_y = crtc->y;
 575
 576         /* Update crtc values up front so the driver can rely on them for mode
 577          * setting.
 578          */
 579         crtc->mode = *mode;
 580         crtc->x = x;
 581         crtc->y = y;
 582
 583         /* Pass our mode to the connectors and the CRTC to give them a chance to
 584          * adjust it according to limitations or connector properties, and also
 585          * a chance to reject the mode entirely.
 586          */
 587         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 588
 589                 if (encoder->crtc != crtc)
 590                         continue;
 591                 encoder_funcs = encoder->helper_private;
 592                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 593                                                       adjusted_mode))) {
 594                         goto done;
 595                 }
 596         }
 597
 598         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 599                 goto done;
 600         }
 601
 602         /* Prepare the encoders and CRTCs before setting the mode. */
 603         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 604
 605                 if (encoder->crtc != crtc)
 606                         continue;
 607                 encoder_funcs = encoder->helper_private;
 608                 /* Disable the encoders as the first thing we do. */
 609                 encoder_funcs->prepare(encoder);
 610         }
 611
 612         drm_crtc_prepare_encoders(dev);
 613
 614         crtc_funcs->prepare(crtc);
 615
 616         /* Set up the DPLL and any encoders state that needs to adjust or depend
 617          * on the DPLL.
 618          */
 619         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 620         if (!ret)
 621             goto done;
 622
 623         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 624
 625                 if (encoder->crtc != crtc)
 626                         continue;
 627
 628                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 629                          mode->name, mode->base.id);
 630                 encoder_funcs = encoder->helper_private;
 631                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 632         }
 633
 634         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 635         crtc_funcs->commit(crtc);
 636
 637         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 638
 639                 if (encoder->crtc != crtc)
 640                         continue;
 641
 642                 encoder_funcs = encoder->helper_private;
 643                 encoder_funcs->commit(encoder);
 644
 645         }
 646
 647         /* XXX free adjustedmode */
 648         drm_mode_destroy(dev, adjusted_mode);
 649         /* FIXME: add subpixel order */
 650 done:
 651         if (!ret) {
 652                 crtc->mode = saved_mode;
 653                 crtc->x = saved_x;
 654                 crtc->y = saved_y;
 655         }
 656
 657         return ret;
 658 }
 659 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 660
 661
 662 /**
 663  * drm_crtc_helper_set_config - set a new config from userspace
 664  * @crtc: CRTC to setup
 665  * @crtc_info: user provided configuration
 666  * @new_mode: new mode to set
 667  * @connector_set: set of connectors for the new config
 668  * @fb: new framebuffer
 669  *
 670  * LOCKING:
 671  * Caller must hold mode config lock.
 672  *
 673  * Setup a new configuration, provided by the user in @crtc_info, and enable
 674  * it.
 675  *
 676  * RETURNS:
 677  * Zero. (FIXME)
 678  */
 679 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 680 {
 681         struct drm_device *dev;
 682         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 683         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 684         struct drm_framebuffer *old_fb = NULL;
 685         bool mode_changed = false; /* if true do a full mode set */
 686         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 687         struct drm_connector *save_connectors, *connector;
 688         int count = 0, ro, fail = 0;
 689         struct drm_crtc_helper_funcs *crtc_funcs;
 690         int ret = 0;
 691
 692         DRM_DEBUG_KMS("\n");
 693
 694         if (!set)
 695                 return -EINVAL;
 696
 697         if (!set->crtc)
 698                 return -EINVAL;
 699
 700         if (!set->crtc->helper_private)
 701                 return -EINVAL;
 702
 703         crtc_funcs = set->crtc->helper_private;
 704
 705         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
 706                         " %d (x, y) (%i, %i)\n",
 707                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 708                   (int)set->num_connectors, set->x, set->y);
 709
 710         dev = set->crtc->dev;
 711
 712         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 713          * connector data. */
 714         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 715                              sizeof(struct drm_crtc), GFP_KERNEL);
 716         if (!save_crtcs)
 717                 return -ENOMEM;
 718
 719         save_encoders = kzalloc(dev->mode_config.num_encoder *
 720                                 sizeof(struct drm_encoder), GFP_KERNEL);
 721         if (!save_encoders) {
 722                 kfree(save_crtcs);
 723                 return -ENOMEM;
 724         }
 725
 726         save_connectors = kzalloc(dev->mode_config.num_connector *
 727                                 sizeof(struct drm_connector), GFP_KERNEL);
 728         if (!save_connectors) {
 729                 kfree(save_crtcs);
 730                 kfree(save_encoders);
 731                 return -ENOMEM;
 732         }
 733
 734         /* Copy data. Note that driver private data is not affected.
 735          * Should anything bad happen only the expected state is
 736          * restored, not the drivers personal bookkeeping.
 737          */
 738         count = 0;
 739         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 740                 save_crtcs[count++] = *crtc;
 741         }
 742
 743         count = 0;
 744         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 745                 save_encoders[count++] = *encoder;
 746         }
 747
 748         count = 0;
 749         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 750                 save_connectors[count++] = *connector;
 751         }
 752
 753         /* We should be able to check here if the fb has the same properties
 754          * and then just flip_or_move it */
 755         if (set->crtc->fb != set->fb) {
 756                 /* If we have no fb then treat it as a full mode set */
 757                 if (set->crtc->fb == NULL) {
 758                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 759                         mode_changed = true;
 760                 } else if (set->fb == NULL) {
 761                         mode_changed = true;
 762                 } else if ((set->fb->bits_per_pixel !=
 763                          set->crtc->fb->bits_per_pixel) ||
 764                          set->fb->depth != set->crtc->fb->depth)
 765                         fb_changed = true;
 766                 else
 767                         fb_changed = true;
 768         }
 769
 770         if (set->x != set->crtc->x || set->y != set->crtc->y)
 771                 fb_changed = true;
 772
 773         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 774                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 775                 drm_mode_debug_printmodeline(&set->crtc->mode);
 776                 drm_mode_debug_printmodeline(set->mode);
 777                 mode_changed = true;
 778         }
 779
 780         /* a) traverse passed in connector list and get encoders for them */
 781         count = 0;
 782         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 783                 struct drm_connector_helper_funcs *connector_funcs =
 784                         connector->helper_private;
 785                 new_encoder = connector->encoder;
 786                 for (ro = 0; ro < set->num_connectors; ro++) {
 787                         if (set->connectors[ro] == connector) {
 788                                 new_encoder = connector_funcs->best_encoder(connector);
 789                                 /* if we can't get an encoder for a connector
 790                                    we are setting now - then fail */
 791                                 if (new_encoder == NULL)
 792                                         /* don't break so fail path works correct */
 793                                         fail = 1;
 794                                 break;
 795                         }
 796                 }
 797
 798                 if (new_encoder != connector->encoder) {
 799                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 800                         mode_changed = true;
 801                         /* If the encoder is reused for another connector, then
 802                          * the appropriate crtc will be set later.
 803                          */
 804                         if (connector->encoder)
 805                                 connector->encoder->crtc = NULL;
 806                         connector->encoder = new_encoder;
 807                 }
 808         }
 809
 810         if (fail) {
 811                 ret = -EINVAL;
 812                 goto fail;
 813         }
 814
 815         count = 0;
 816         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 817                 if (!connector->encoder)
 818                         continue;
 819
 820                 if (connector->encoder->crtc == set->crtc)
 821                         new_crtc = NULL;
 822                 else
 823                         new_crtc = connector->encoder->crtc;
 824
 825                 for (ro = 0; ro < set->num_connectors; ro++) {
 826                         if (set->connectors[ro] == connector)
 827                                 new_crtc = set->crtc;
 828                 }
 829
 830                 /* Make sure the new CRTC will work with the encoder */
 831                 if (new_crtc &&
 832                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 833                         ret = -EINVAL;
 834                         goto fail;
 835                 }
 836                 if (new_crtc != connector->encoder->crtc) {
 837                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 838                         mode_changed = true;
 839                         connector->encoder->crtc = new_crtc;
 840                 }
 841                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
 842                           connector->base.id, new_crtc);
 843         }
 844
 845         /* mode_set_base is not a required function */
 846         if (fb_changed && !crtc_funcs->mode_set_base)
 847                 mode_changed = true;
 848
 849         if (mode_changed) {
 850                 old_fb = set->crtc->fb;
 851                 set->crtc->fb = set->fb;
 852                 set->crtc->enabled = (set->mode != NULL);
 853                 if (set->mode != NULL) {
 854                         DRM_DEBUG_KMS("attempting to set mode from"
 855                                         " userspace\n");
 856                         drm_mode_debug_printmodeline(set->mode);
 857                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 858                                                       set->x, set->y,
 859                                                       old_fb)) {
 860                                 DRM_ERROR("failed to set mode on crtc %p\n",
 861                                           set->crtc);
 862                                 ret = -EINVAL;
 863                                 goto fail;
 864                         }
 865                         /* TODO are these needed? */
 866                         set->crtc->desired_x = set->x;
 867                         set->crtc->desired_y = set->y;
 868                         set->crtc->desired_mode = set->mode;
 869                 }
 870                 drm_helper_disable_unused_functions(dev);
 871         } else if (fb_changed) {
 872                 set->crtc->x = set->x;
 873                 set->crtc->y = set->y;
 874
 875                 old_fb = set->crtc->fb;
 876                 if (set->crtc->fb != set->fb)
 877                         set->crtc->fb = set->fb;
 878                 ret = crtc_funcs->mode_set_base(set->crtc,
 879                                                 set->x, set->y, old_fb);
 880                 if (ret != 0)
 881                         goto fail;
 882         }
 883
 884         kfree(save_connectors);
 885         kfree(save_encoders);
 886         kfree(save_crtcs);
 887         return 0;
 888
 889 fail:
 890         /* Restore all previous data. */
 891         count = 0;
 892         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 893                 *crtc = save_crtcs[count++];
 894         }
 895
 896         count = 0;
 897         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 898                 *encoder = save_encoders[count++];
 899         }
 900
 901         count = 0;
 902         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 903                 *connector = save_connectors[count++];
 904         }
 905
 906         kfree(save_connectors);
 907         kfree(save_encoders);
 908         kfree(save_crtcs);
 909         return ret;
 910 }
 911 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 912
 913 bool drm_helper_plugged_event(struct drm_device *dev)
 914 {
 915         DRM_DEBUG_KMS("\n");
 916
 917         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
 918                                          dev->mode_config.max_height);
 919
 920         drm_setup_crtcs(dev);
 921
 922         /* alert the driver fb layer */
 923         dev->mode_config.funcs->fb_changed(dev);
 924
 925         /* FIXME: send hotplug event */
 926         return true;
 927 }
 928 /**
 929  * drm_initial_config - setup a sane initial connector configuration
 930  * @dev: DRM device
 931  *
 932  * LOCKING:
 933  * Called at init time, must take mode config lock.
 934  *
 935  * Scan the CRTCs and connectors and try to put together an initial setup.
 936  * At the moment, this is a cloned configuration across all heads with
 937  * a new framebuffer object as the backing store.
 938  *
 939  * RETURNS:
 940  * Zero if everything went ok, nonzero otherwise.
 941  */
 942 bool drm_helper_initial_config(struct drm_device *dev)
 943 {
 944         int count = 0;
 945
 946         count = drm_helper_probe_connector_modes(dev,
 947                                                  dev->mode_config.max_width,
 948                                                  dev->mode_config.max_height);
 949
 950         /*
 951          * we shouldn't end up with no modes here.
 952          */
 953         WARN(!count, "Connected connector with 0 modes\n");
 954
 955         drm_setup_crtcs(dev);
 956
 957         /* alert the driver fb layer */
 958         dev->mode_config.funcs->fb_changed(dev);
 959
 960         return 0;
 961 }
 962 EXPORT_SYMBOL(drm_helper_initial_config);
 963
 964 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 965 {
 966         int dpms = DRM_MODE_DPMS_OFF;
 967         struct drm_connector *connector;
 968         struct drm_device *dev = encoder->dev;
 969
 970         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 971                 if (connector->encoder == encoder)
 972                         if (connector->dpms < dpms)
 973                                 dpms = connector->dpms;
 974         return dpms;
 975 }
 976
 977 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 978 {
 979         int dpms = DRM_MODE_DPMS_OFF;
 980         struct drm_connector *connector;
 981         struct drm_device *dev = crtc->dev;
 982
 983         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 984                 if (connector->encoder && connector->encoder->crtc == crtc)
 985                         if (connector->dpms < dpms)
 986                                 dpms = connector->dpms;
 987         return dpms;
 988 }
 989
 990 /**
 991  * drm_helper_connector_dpms
 992  * @connector affected connector
 993  * @mode DPMS mode
 994  *
 995  * Calls the low-level connector DPMS function, then
 996  * calls appropriate encoder and crtc DPMS functions as well
 997  */
 998 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 999 {
1000         struct drm_encoder *encoder = connector->encoder;
1001         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
1002         int old_dpms;
1003
1004         if (mode == connector->dpms)
1005                 return;
1006
1007         old_dpms = connector->dpms;
1008         connector->dpms = mode;
1009
1010         /* from off to on, do crtc then encoder */
1011         if (mode < old_dpms) {
1012                 if (crtc) {
1013                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1014                         if (crtc_funcs->dpms)
1015                                 (*crtc_funcs->dpms) (crtc,
1016                                                      drm_helper_choose_crtc_dpms(crtc));
1017                 }
1018                 if (encoder) {
1019                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1020                         if (encoder_funcs->dpms)
1021                                 (*encoder_funcs->dpms) (encoder,
1022                                                         drm_helper_choose_encoder_dpms(encoder));
1023                 }
1024         }
1025
1026         /* from on to off, do encoder then crtc */
1027         if (mode > old_dpms) {
1028                 if (encoder) {
1029                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1030                         if (encoder_funcs->dpms)
1031                                 (*encoder_funcs->dpms) (encoder,
1032                                                         drm_helper_choose_encoder_dpms(encoder));
1033                 }
1034                 if (crtc) {
1035                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1036                         if (crtc_funcs->dpms)
1037                                 (*crtc_funcs->dpms) (crtc,
1038                                                      drm_helper_choose_crtc_dpms(crtc));
1039                 }
1040         }
1041
1042         return;
1043 }
1044 EXPORT_SYMBOL(drm_helper_connector_dpms);
1045
1046 /**
1047  * drm_hotplug_stage_two
1048  * @dev DRM device
1049  * @connector hotpluged connector
1050  *
1051  * LOCKING.
1052  * Caller must hold mode config lock, function might grab struct lock.
1053  *
1054  * Stage two of a hotplug.
1055  *
1056  * RETURNS:
1057  * Zero on success, errno on failure.
1058  */
1059 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1060 {
1061         drm_helper_plugged_event(dev);
1062
1063         return 0;
1064 }
1065 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1066
1067 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1068                                    struct drm_mode_fb_cmd *mode_cmd)
1069 {
1070         fb->width = mode_cmd->width;
1071         fb->height = mode_cmd->height;
1072         fb->pitch = mode_cmd->pitch;
1073         fb->bits_per_pixel = mode_cmd->bpp;
1074         fb->depth = mode_cmd->depth;
1075
1076         return 0;
1077 }
1078 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1079
1080 int drm_helper_resume_force_mode(struct drm_device *dev)
1081 {
1082         struct drm_crtc *crtc;
1083         int ret;
1084
1085         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1086
1087                 if (!crtc->enabled)
1088                         continue;
1089
1090                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1091                                                crtc->x, crtc->y, crtc->fb);
1092
1093                 if (ret == false)
1094                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1095         }
1096         /* disable the unused connectors while restoring the modesetting */
1097         drm_helper_disable_unused_functions(dev);
1098         return 0;
1099 }
1100 EXPORT_SYMBOL(drm_helper_resume_force_mode);