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 #include "drm_fb_helper.h"
  36
  37 static void drm_mode_validate_flag(struct drm_connector *connector,
  38                                    int flags)
  39 {
  40         struct drm_display_mode *mode, *t;
  41
  42         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  43                 return;
  44
  45         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  46                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  47                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  48                         mode->status = MODE_NO_INTERLACE;
  49                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  50                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  51                         mode->status = MODE_NO_DBLESCAN;
  52         }
  53
  54         return;
  55 }
  56
  57 /**
  58  * drm_helper_probe_connector_modes - get complete set of display modes
  59  * @dev: DRM device
  60  * @maxX: max width for modes
  61  * @maxY: max height for modes
  62  *
  63  * LOCKING:
  64  * Caller must hold mode config lock.
  65  *
  66  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  67  * modes on them.  Modes will first be added to the connector's probed_modes
  68  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  69  * put into the normal modes list.
  70  *
  71  * Intended to be used either at bootup time or when major configuration
  72  * changes have occurred.
  73  *
  74  * FIXME: take into account monitor limits
  75  *
  76  * RETURNS:
  77  * Number of modes found on @connector.
  78  */
  79 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  80                                             uint32_t maxX, uint32_t maxY)
  81 {
  82         struct drm_device *dev = connector->dev;
  83         struct drm_display_mode *mode, *t;
  84         struct drm_connector_helper_funcs *connector_funcs =
  85                 connector->helper_private;
  86         int count = 0;
  87         int mode_flags = 0;
  88
  89         DRM_DEBUG_KMS("%s\n", drm_get_connector_name(connector));
  90         /* set all modes to the unverified state */
  91         list_for_each_entry_safe(mode, t, &connector->modes, head)
  92                 mode->status = MODE_UNVERIFIED;
  93
  94         if (connector->force) {
  95                 if (connector->force == DRM_FORCE_ON)
  96                         connector->status = connector_status_connected;
  97                 else
  98                         connector->status = connector_status_disconnected;
  99                 if (connector->funcs->force)
 100                         connector->funcs->force(connector);
 101         } else
 102                 connector->status = connector->funcs->detect(connector);
 103
 104         if (connector->status == connector_status_disconnected) {
 105                 DRM_DEBUG_KMS("%s is disconnected\n",
 106                           drm_get_connector_name(connector));
 107                 goto prune;
 108         }
 109
 110         count = (*connector_funcs->get_modes)(connector);
 111         if (!count) {
 112                 count = drm_add_modes_noedid(connector, 1024, 768);
 113                 if (!count)
 114                         return 0;
 115         }
 116
 117         drm_mode_connector_list_update(connector);
 118
 119         if (maxX && maxY)
 120                 drm_mode_validate_size(dev, &connector->modes, maxX,
 121                                        maxY, 0);
 122
 123         if (connector->interlace_allowed)
 124                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 125         if (connector->doublescan_allowed)
 126                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 127         drm_mode_validate_flag(connector, mode_flags);
 128
 129         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 130                 if (mode->status == MODE_OK)
 131                         mode->status = connector_funcs->mode_valid(connector,
 132                                                                    mode);
 133         }
 134
 135 prune:
 136         drm_mode_prune_invalid(dev, &connector->modes, true);
 137
 138         if (list_empty(&connector->modes))
 139                 return 0;
 140
 141         drm_mode_sort(&connector->modes);
 142
 143         DRM_DEBUG_KMS("Probed modes for %s\n",
 144                                 drm_get_connector_name(connector));
 145         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 146                 mode->vrefresh = drm_mode_vrefresh(mode);
 147
 148                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 149                 drm_mode_debug_printmodeline(mode);
 150         }
 151
 152         return count;
 153 }
 154 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 155
 156 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
 157                                       uint32_t maxY)
 158 {
 159         struct drm_connector *connector;
 160         int count = 0;
 161
 162         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 163                 count += drm_helper_probe_single_connector_modes(connector,
 164                                                                  maxX, maxY);
 165         }
 166
 167         return count;
 168 }
 169 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
 170
 171 /**
 172  * drm_helper_encoder_in_use - check if a given encoder is in use
 173  * @encoder: encoder to check
 174  *
 175  * LOCKING:
 176  * Caller must hold mode config lock.
 177  *
 178  * Walk @encoders's DRM device's mode_config and see if it's in use.
 179  *
 180  * RETURNS:
 181  * True if @encoder is part of the mode_config, false otherwise.
 182  */
 183 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 184 {
 185         struct drm_connector *connector;
 186         struct drm_device *dev = encoder->dev;
 187         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 188                 if (connector->encoder == encoder)
 189                         return true;
 190         return false;
 191 }
 192 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 193
 194 /**
 195  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 196  * @crtc: CRTC to check
 197  *
 198  * LOCKING:
 199  * Caller must hold mode config lock.
 200  *
 201  * Walk @crtc's DRM device's mode_config and see if it's in use.
 202  *
 203  * RETURNS:
 204  * True if @crtc is part of the mode_config, false otherwise.
 205  */
 206 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 207 {
 208         struct drm_encoder *encoder;
 209         struct drm_device *dev = crtc->dev;
 210         /* FIXME: Locking around list access? */
 211         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 212                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 213                         return true;
 214         return false;
 215 }
 216 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 217
 218 /**
 219  * drm_helper_disable_unused_functions - disable unused objects
 220  * @dev: DRM device
 221  *
 222  * LOCKING:
 223  * Caller must hold mode config lock.
 224  *
 225  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 226  * by calling its dpms function, which should power it off.
 227  */
 228 void drm_helper_disable_unused_functions(struct drm_device *dev)
 229 {
 230         struct drm_encoder *encoder;
 231         struct drm_connector *connector;
 232         struct drm_encoder_helper_funcs *encoder_funcs;
 233         struct drm_crtc *crtc;
 234
 235         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 236                 if (!connector->encoder)
 237                         continue;
 238                 if (connector->status == connector_status_disconnected)
 239                         connector->encoder = NULL;
 240         }
 241
 242         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 243                 encoder_funcs = encoder->helper_private;
 244                 if (!drm_helper_encoder_in_use(encoder)) {
 245                         if (encoder_funcs->disable)
 246                                 (*encoder_funcs->disable)(encoder);
 247                         else
 248                                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 249                         /* disconnector encoder from any connector */
 250                         encoder->crtc = NULL;
 251                 }
 252         }
 253
 254         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 255                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 256                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 257                 if (!crtc->enabled) {
 258                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 259                         crtc->fb = NULL;
 260                 }
 261         }
 262 }
 263 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 264
 265 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 266 {
 267         struct drm_display_mode *mode;
 268
 269         list_for_each_entry(mode, &connector->modes, head) {
 270                 if (drm_mode_width(mode) > width ||
 271                     drm_mode_height(mode) > height)
 272                         continue;
 273                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 274                         return mode;
 275         }
 276         return NULL;
 277 }
 278
 279 static bool drm_has_cmdline_mode(struct drm_connector *connector)
 280 {
 281         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 282         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 283
 284         if (!fb_help_conn)
 285                 return false;
 286
 287         cmdline_mode = &fb_help_conn->cmdline_mode;
 288         return cmdline_mode->specified;
 289 }
 290
 291 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
 292 {
 293         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 294         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 295         struct drm_display_mode *mode = NULL;
 296
 297         if (!fb_help_conn)
 298                 return mode;
 299
 300         cmdline_mode = &fb_help_conn->cmdline_mode;
 301         if (cmdline_mode->specified == false)
 302                 return mode;
 303
 304         /* attempt to find a matching mode in the list of modes
 305          *  we have gotten so far, if not add a CVT mode that conforms
 306          */
 307         if (cmdline_mode->rb || cmdline_mode->margins)
 308                 goto create_mode;
 309
 310         list_for_each_entry(mode, &connector->modes, head) {
 311                 /* check width/height */
 312                 if (mode->hdisplay != cmdline_mode->xres ||
 313                     mode->vdisplay != cmdline_mode->yres)
 314                         continue;
 315
 316                 if (cmdline_mode->refresh_specified) {
 317                         if (mode->vrefresh != cmdline_mode->refresh)
 318                                 continue;
 319                 }
 320
 321                 if (cmdline_mode->interlace) {
 322                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
 323                                 continue;
 324                 }
 325                 return mode;
 326         }
 327
 328 create_mode:
 329         mode = drm_cvt_mode(connector->dev, cmdline_mode->xres,
 330                             cmdline_mode->yres,
 331                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
 332                             cmdline_mode->rb, cmdline_mode->interlace,
 333                             cmdline_mode->margins);
 334         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 335         list_add(&mode->head, &connector->modes);
 336         return mode;
 337 }
 338
 339 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 340 {
 341         bool enable;
 342
 343         if (strict) {
 344                 enable = connector->status == connector_status_connected;
 345         } else {
 346                 enable = connector->status != connector_status_disconnected;
 347         }
 348         return enable;
 349 }
 350
 351 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 352 {
 353         bool any_enabled = false;
 354         struct drm_connector *connector;
 355         int i = 0;
 356
 357         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 358                 enabled[i] = drm_connector_enabled(connector, true);
 359                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
 360                           enabled[i] ? "yes" : "no");
 361                 any_enabled |= enabled[i];
 362                 i++;
 363         }
 364
 365         if (any_enabled)
 366                 return;
 367
 368         i = 0;
 369         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 370                 enabled[i] = drm_connector_enabled(connector, false);
 371                 i++;
 372         }
 373 }
 374
 375 static bool drm_target_preferred(struct drm_device *dev,
 376                                  struct drm_display_mode **modes,
 377                                  bool *enabled, int width, int height)
 378 {
 379         struct drm_connector *connector;
 380         int i = 0;
 381
 382         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 383
 384                 if (enabled[i] == false) {
 385                         i++;
 386                         continue;
 387                 }
 388
 389                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
 390                               connector->base.id);
 391
 392                 /* got for command line mode first */
 393                 modes[i] = drm_pick_cmdline_mode(connector, width, height);
 394                 if (!modes[i]) {
 395                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 396                                       connector->base.id);
 397                         modes[i] = drm_has_preferred_mode(connector, width, height);
 398                 }
 399                 /* No preferred modes, pick one off the list */
 400                 if (!modes[i] && !list_empty(&connector->modes)) {
 401                         list_for_each_entry(modes[i], &connector->modes, head)
 402                                 break;
 403                 }
 404                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
 405                           "none");
 406                 i++;
 407         }
 408         return true;
 409 }
 410
 411 static int drm_pick_crtcs(struct drm_device *dev,
 412                           struct drm_crtc **best_crtcs,
 413                           struct drm_display_mode **modes,
 414                           int n, int width, int height)
 415 {
 416         int c, o;
 417         struct drm_connector *connector;
 418         struct drm_connector_helper_funcs *connector_funcs;
 419         struct drm_encoder *encoder;
 420         struct drm_crtc *best_crtc;
 421         int my_score, best_score, score;
 422         struct drm_crtc **crtcs, *crtc;
 423
 424         if (n == dev->mode_config.num_connector)
 425                 return 0;
 426         c = 0;
 427         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 428                 if (c == n)
 429                         break;
 430                 c++;
 431         }
 432
 433         best_crtcs[n] = NULL;
 434         best_crtc = NULL;
 435         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 436         if (modes[n] == NULL)
 437                 return best_score;
 438
 439         crtcs = kmalloc(dev->mode_config.num_connector *
 440                         sizeof(struct drm_crtc *), GFP_KERNEL);
 441         if (!crtcs)
 442                 return best_score;
 443
 444         my_score = 1;
 445         if (connector->status == connector_status_connected)
 446                 my_score++;
 447         if (drm_has_cmdline_mode(connector))
 448                 my_score++;
 449         if (drm_has_preferred_mode(connector, width, height))
 450                 my_score++;
 451
 452         connector_funcs = connector->helper_private;
 453         encoder = connector_funcs->best_encoder(connector);
 454         if (!encoder)
 455                 goto out;
 456
 457         connector->encoder = encoder;
 458
 459         /* select a crtc for this connector and then attempt to configure
 460            remaining connectors */
 461         c = 0;
 462         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 463
 464                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
 465                         c++;
 466                         continue;
 467                 }
 468
 469                 for (o = 0; o < n; o++)
 470                         if (best_crtcs[o] == crtc)
 471                                 break;
 472
 473                 if (o < n) {
 474                         /* ignore cloning for now */
 475                         c++;
 476                         continue;
 477                 }
 478
 479                 crtcs[n] = crtc;
 480                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 481                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
 482                                                   width, height);
 483                 if (score > best_score) {
 484                         best_crtc = crtc;
 485                         best_score = score;
 486                         memcpy(best_crtcs, crtcs,
 487                                dev->mode_config.num_connector *
 488                                sizeof(struct drm_crtc *));
 489                 }
 490                 c++;
 491         }
 492 out:
 493         kfree(crtcs);
 494         return best_score;
 495 }
 496
 497 static void drm_setup_crtcs(struct drm_device *dev)
 498 {
 499         struct drm_crtc **crtcs;
 500         struct drm_display_mode **modes;
 501         struct drm_encoder *encoder;
 502         struct drm_connector *connector;
 503         bool *enabled;
 504         int width, height;
 505         int i, ret;
 506
 507         DRM_DEBUG_KMS("\n");
 508
 509         width = dev->mode_config.max_width;
 510         height = dev->mode_config.max_height;
 511
 512         /* clean out all the encoder/crtc combos */
 513         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 514                 encoder->crtc = NULL;
 515         }
 516
 517         crtcs = kcalloc(dev->mode_config.num_connector,
 518                         sizeof(struct drm_crtc *), GFP_KERNEL);
 519         modes = kcalloc(dev->mode_config.num_connector,
 520                         sizeof(struct drm_display_mode *), GFP_KERNEL);
 521         enabled = kcalloc(dev->mode_config.num_connector,
 522                           sizeof(bool), GFP_KERNEL);
 523
 524         drm_enable_connectors(dev, enabled);
 525
 526         ret = drm_target_preferred(dev, modes, enabled, width, height);
 527         if (!ret)
 528                 DRM_ERROR("Unable to find initial modes\n");
 529
 530         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
 531
 532         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 533
 534         i = 0;
 535         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 536                 struct drm_display_mode *mode = modes[i];
 537                 struct drm_crtc *crtc = crtcs[i];
 538
 539                 if (connector->encoder == NULL) {
 540                         i++;
 541                         continue;
 542                 }
 543
 544                 if (mode && crtc) {
 545                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
 546                                   mode->name, crtc->base.id);
 547                         crtc->desired_mode = mode;
 548                         connector->encoder->crtc = crtc;
 549                 } else {
 550                         connector->encoder->crtc = NULL;
 551                         connector->encoder = NULL;
 552                 }
 553                 i++;
 554         }
 555
 556         kfree(crtcs);
 557         kfree(modes);
 558         kfree(enabled);
 559 }
 560
 561 /**
 562  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 563  * @encoder: encoder to test
 564  * @crtc: crtc to test
 565  *
 566  * Return false if @encoder can't be driven by @crtc, true otherwise.
 567  */
 568 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 569                                 struct drm_crtc *crtc)
 570 {
 571         struct drm_device *dev;
 572         struct drm_crtc *tmp;
 573         int crtc_mask = 1;
 574
 575         WARN(!crtc, "checking null crtc?");
 576
 577         dev = crtc->dev;
 578
 579         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 580                 if (tmp == crtc)
 581                         break;
 582                 crtc_mask <<= 1;
 583         }
 584
 585         if (encoder->possible_crtcs & crtc_mask)
 586                 return true;
 587         return false;
 588 }
 589
 590 /*
 591  * Check the CRTC we're going to map each output to vs. its current
 592  * CRTC.  If they don't match, we have to disable the output and the CRTC
 593  * since the driver will have to re-route things.
 594  */
 595 static void
 596 drm_crtc_prepare_encoders(struct drm_device *dev)
 597 {
 598         struct drm_encoder_helper_funcs *encoder_funcs;
 599         struct drm_encoder *encoder;
 600
 601         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 602                 encoder_funcs = encoder->helper_private;
 603                 /* Disable unused encoders */
 604                 if (encoder->crtc == NULL)
 605                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 606                 /* Disable encoders whose CRTC is about to change */
 607                 if (encoder_funcs->get_crtc &&
 608                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 609                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 610         }
 611 }
 612
 613 /**
 614  * drm_crtc_set_mode - set a mode
 615  * @crtc: CRTC to program
 616  * @mode: mode to use
 617  * @x: width of mode
 618  * @y: height of mode
 619  *
 620  * LOCKING:
 621  * Caller must hold mode config lock.
 622  *
 623  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 624  * to fixup or reject the mode prior to trying to set it.
 625  *
 626  * RETURNS:
 627  * True if the mode was set successfully, or false otherwise.
 628  */
 629 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 630                               struct drm_display_mode *mode,
 631                               int x, int y,
 632                               struct drm_framebuffer *old_fb)
 633 {
 634         struct drm_device *dev = crtc->dev;
 635         struct drm_display_mode *adjusted_mode, saved_mode;
 636         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 637         struct drm_encoder_helper_funcs *encoder_funcs;
 638         int saved_x, saved_y;
 639         struct drm_encoder *encoder;
 640         bool ret = true;
 641
 642         adjusted_mode = drm_mode_duplicate(dev, mode);
 643
 644         crtc->enabled = drm_helper_crtc_in_use(crtc);
 645
 646         if (!crtc->enabled)
 647                 return true;
 648
 649         saved_mode = crtc->mode;
 650         saved_x = crtc->x;
 651         saved_y = crtc->y;
 652
 653         /* Update crtc values up front so the driver can rely on them for mode
 654          * setting.
 655          */
 656         crtc->mode = *mode;
 657         crtc->x = x;
 658         crtc->y = y;
 659
 660         /* Pass our mode to the connectors and the CRTC to give them a chance to
 661          * adjust it according to limitations or connector properties, and also
 662          * a chance to reject the mode entirely.
 663          */
 664         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 665
 666                 if (encoder->crtc != crtc)
 667                         continue;
 668                 encoder_funcs = encoder->helper_private;
 669                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 670                                                       adjusted_mode))) {
 671                         goto done;
 672                 }
 673         }
 674
 675         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 676                 goto done;
 677         }
 678
 679         /* Prepare the encoders and CRTCs before setting the mode. */
 680         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 681
 682                 if (encoder->crtc != crtc)
 683                         continue;
 684                 encoder_funcs = encoder->helper_private;
 685                 /* Disable the encoders as the first thing we do. */
 686                 encoder_funcs->prepare(encoder);
 687         }
 688
 689         drm_crtc_prepare_encoders(dev);
 690
 691         crtc_funcs->prepare(crtc);
 692
 693         /* Set up the DPLL and any encoders state that needs to adjust or depend
 694          * on the DPLL.
 695          */
 696         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 697         if (!ret)
 698             goto done;
 699
 700         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 701
 702                 if (encoder->crtc != crtc)
 703                         continue;
 704
 705                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 706                          mode->name, mode->base.id);
 707                 encoder_funcs = encoder->helper_private;
 708                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 709         }
 710
 711         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 712         crtc_funcs->commit(crtc);
 713
 714         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 715
 716                 if (encoder->crtc != crtc)
 717                         continue;
 718
 719                 encoder_funcs = encoder->helper_private;
 720                 encoder_funcs->commit(encoder);
 721
 722         }
 723
 724         /* XXX free adjustedmode */
 725         drm_mode_destroy(dev, adjusted_mode);
 726         /* FIXME: add subpixel order */
 727 done:
 728         if (!ret) {
 729                 crtc->mode = saved_mode;
 730                 crtc->x = saved_x;
 731                 crtc->y = saved_y;
 732         }
 733
 734         return ret;
 735 }
 736 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 737
 738
 739 /**
 740  * drm_crtc_helper_set_config - set a new config from userspace
 741  * @crtc: CRTC to setup
 742  * @crtc_info: user provided configuration
 743  * @new_mode: new mode to set
 744  * @connector_set: set of connectors for the new config
 745  * @fb: new framebuffer
 746  *
 747  * LOCKING:
 748  * Caller must hold mode config lock.
 749  *
 750  * Setup a new configuration, provided by the user in @crtc_info, and enable
 751  * it.
 752  *
 753  * RETURNS:
 754  * Zero. (FIXME)
 755  */
 756 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 757 {
 758         struct drm_device *dev;
 759         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 760         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 761         struct drm_framebuffer *old_fb = NULL;
 762         bool mode_changed = false; /* if true do a full mode set */
 763         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 764         struct drm_connector *save_connectors, *connector;
 765         int count = 0, ro, fail = 0;
 766         struct drm_crtc_helper_funcs *crtc_funcs;
 767         int ret = 0;
 768
 769         DRM_DEBUG_KMS("\n");
 770
 771         if (!set)
 772                 return -EINVAL;
 773
 774         if (!set->crtc)
 775                 return -EINVAL;
 776
 777         if (!set->crtc->helper_private)
 778                 return -EINVAL;
 779
 780         crtc_funcs = set->crtc->helper_private;
 781
 782         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
 783                         " %d (x, y) (%i, %i)\n",
 784                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 785                   (int)set->num_connectors, set->x, set->y);
 786
 787         dev = set->crtc->dev;
 788
 789         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 790          * connector data. */
 791         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 792                              sizeof(struct drm_crtc), GFP_KERNEL);
 793         if (!save_crtcs)
 794                 return -ENOMEM;
 795
 796         save_encoders = kzalloc(dev->mode_config.num_encoder *
 797                                 sizeof(struct drm_encoder), GFP_KERNEL);
 798         if (!save_encoders) {
 799                 kfree(save_crtcs);
 800                 return -ENOMEM;
 801         }
 802
 803         save_connectors = kzalloc(dev->mode_config.num_connector *
 804                                 sizeof(struct drm_connector), GFP_KERNEL);
 805         if (!save_connectors) {
 806                 kfree(save_crtcs);
 807                 kfree(save_encoders);
 808                 return -ENOMEM;
 809         }
 810
 811         /* Copy data. Note that driver private data is not affected.
 812          * Should anything bad happen only the expected state is
 813          * restored, not the drivers personal bookkeeping.
 814          */
 815         count = 0;
 816         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 817                 save_crtcs[count++] = *crtc;
 818         }
 819
 820         count = 0;
 821         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 822                 save_encoders[count++] = *encoder;
 823         }
 824
 825         count = 0;
 826         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 827                 save_connectors[count++] = *connector;
 828         }
 829
 830         /* We should be able to check here if the fb has the same properties
 831          * and then just flip_or_move it */
 832         if (set->crtc->fb != set->fb) {
 833                 /* If we have no fb then treat it as a full mode set */
 834                 if (set->crtc->fb == NULL) {
 835                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 836                         mode_changed = true;
 837                 } else if (set->fb == NULL) {
 838                         mode_changed = true;
 839                 } else if ((set->fb->bits_per_pixel !=
 840                          set->crtc->fb->bits_per_pixel) ||
 841                          set->fb->depth != set->crtc->fb->depth)
 842                         fb_changed = true;
 843                 else
 844                         fb_changed = true;
 845         }
 846
 847         if (set->x != set->crtc->x || set->y != set->crtc->y)
 848                 fb_changed = true;
 849
 850         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 851                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 852                 drm_mode_debug_printmodeline(&set->crtc->mode);
 853                 drm_mode_debug_printmodeline(set->mode);
 854                 mode_changed = true;
 855         }
 856
 857         /* a) traverse passed in connector list and get encoders for them */
 858         count = 0;
 859         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 860                 struct drm_connector_helper_funcs *connector_funcs =
 861                         connector->helper_private;
 862                 new_encoder = connector->encoder;
 863                 for (ro = 0; ro < set->num_connectors; ro++) {
 864                         if (set->connectors[ro] == connector) {
 865                                 new_encoder = connector_funcs->best_encoder(connector);
 866                                 /* if we can't get an encoder for a connector
 867                                    we are setting now - then fail */
 868                                 if (new_encoder == NULL)
 869                                         /* don't break so fail path works correct */
 870                                         fail = 1;
 871                                 break;
 872                         }
 873                 }
 874
 875                 if (new_encoder != connector->encoder) {
 876                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 877                         mode_changed = true;
 878                         /* If the encoder is reused for another connector, then
 879                          * the appropriate crtc will be set later.
 880                          */
 881                         if (connector->encoder)
 882                                 connector->encoder->crtc = NULL;
 883                         connector->encoder = new_encoder;
 884                 }
 885         }
 886
 887         if (fail) {
 888                 ret = -EINVAL;
 889                 goto fail;
 890         }
 891
 892         count = 0;
 893         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 894                 if (!connector->encoder)
 895                         continue;
 896
 897                 if (connector->encoder->crtc == set->crtc)
 898                         new_crtc = NULL;
 899                 else
 900                         new_crtc = connector->encoder->crtc;
 901
 902                 for (ro = 0; ro < set->num_connectors; ro++) {
 903                         if (set->connectors[ro] == connector)
 904                                 new_crtc = set->crtc;
 905                 }
 906
 907                 /* Make sure the new CRTC will work with the encoder */
 908                 if (new_crtc &&
 909                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 910                         ret = -EINVAL;
 911                         goto fail;
 912                 }
 913                 if (new_crtc != connector->encoder->crtc) {
 914                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 915                         mode_changed = true;
 916                         connector->encoder->crtc = new_crtc;
 917                 }
 918                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
 919                           connector->base.id, new_crtc);
 920         }
 921
 922         /* mode_set_base is not a required function */
 923         if (fb_changed && !crtc_funcs->mode_set_base)
 924                 mode_changed = true;
 925
 926         if (mode_changed) {
 927                 old_fb = set->crtc->fb;
 928                 set->crtc->fb = set->fb;
 929                 set->crtc->enabled = (set->mode != NULL);
 930                 if (set->mode != NULL) {
 931                         DRM_DEBUG_KMS("attempting to set mode from"
 932                                         " userspace\n");
 933                         drm_mode_debug_printmodeline(set->mode);
 934                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 935                                                       set->x, set->y,
 936                                                       old_fb)) {
 937                                 DRM_ERROR("failed to set mode on crtc %p\n",
 938                                           set->crtc);
 939                                 ret = -EINVAL;
 940                                 goto fail;
 941                         }
 942                         /* TODO are these needed? */
 943                         set->crtc->desired_x = set->x;
 944                         set->crtc->desired_y = set->y;
 945                         set->crtc->desired_mode = set->mode;
 946                 }
 947                 drm_helper_disable_unused_functions(dev);
 948         } else if (fb_changed) {
 949                 set->crtc->x = set->x;
 950                 set->crtc->y = set->y;
 951
 952                 old_fb = set->crtc->fb;
 953                 if (set->crtc->fb != set->fb)
 954                         set->crtc->fb = set->fb;
 955                 ret = crtc_funcs->mode_set_base(set->crtc,
 956                                                 set->x, set->y, old_fb);
 957                 if (ret != 0)
 958                         goto fail;
 959         }
 960
 961         kfree(save_connectors);
 962         kfree(save_encoders);
 963         kfree(save_crtcs);
 964         return 0;
 965
 966 fail:
 967         /* Restore all previous data. */
 968         count = 0;
 969         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 970                 *crtc = save_crtcs[count++];
 971         }
 972
 973         count = 0;
 974         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 975                 *encoder = save_encoders[count++];
 976         }
 977
 978         count = 0;
 979         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 980                 *connector = save_connectors[count++];
 981         }
 982
 983         kfree(save_connectors);
 984         kfree(save_encoders);
 985         kfree(save_crtcs);
 986         return ret;
 987 }
 988 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 989
 990 bool drm_helper_plugged_event(struct drm_device *dev)
 991 {
 992         DRM_DEBUG_KMS("\n");
 993
 994         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
 995                                          dev->mode_config.max_height);
 996
 997         drm_setup_crtcs(dev);
 998
 999         /* alert the driver fb layer */
1000         dev->mode_config.funcs->fb_changed(dev);
1001
1002         /* FIXME: send hotplug event */
1003         return true;
1004 }
1005 /**
1006  * drm_initial_config - setup a sane initial connector configuration
1007  * @dev: DRM device
1008  *
1009  * LOCKING:
1010  * Called at init time, must take mode config lock.
1011  *
1012  * Scan the CRTCs and connectors and try to put together an initial setup.
1013  * At the moment, this is a cloned configuration across all heads with
1014  * a new framebuffer object as the backing store.
1015  *
1016  * RETURNS:
1017  * Zero if everything went ok, nonzero otherwise.
1018  */
1019 bool drm_helper_initial_config(struct drm_device *dev)
1020 {
1021         int count = 0;
1022
1023         /* disable all the possible outputs/crtcs before entering KMS mode */
1024         drm_helper_disable_unused_functions(dev);
1025
1026         drm_fb_helper_parse_command_line(dev);
1027
1028         count = drm_helper_probe_connector_modes(dev,
1029                                                  dev->mode_config.max_width,
1030                                                  dev->mode_config.max_height);
1031
1032         /*
1033          * we shouldn't end up with no modes here.
1034          */
1035         printk(KERN_INFO "No connectors reported conncted with modes\n");
1036
1037         drm_setup_crtcs(dev);
1038
1039         /* alert the driver fb layer */
1040         dev->mode_config.funcs->fb_changed(dev);
1041
1042         return 0;
1043 }
1044 EXPORT_SYMBOL(drm_helper_initial_config);
1045
1046 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
1047 {
1048         int dpms = DRM_MODE_DPMS_OFF;
1049         struct drm_connector *connector;
1050         struct drm_device *dev = encoder->dev;
1051
1052         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1053                 if (connector->encoder == encoder)
1054                         if (connector->dpms < dpms)
1055                                 dpms = connector->dpms;
1056         return dpms;
1057 }
1058
1059 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
1060 {
1061         int dpms = DRM_MODE_DPMS_OFF;
1062         struct drm_connector *connector;
1063         struct drm_device *dev = crtc->dev;
1064
1065         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1066                 if (connector->encoder && connector->encoder->crtc == crtc)
1067                         if (connector->dpms < dpms)
1068                                 dpms = connector->dpms;
1069         return dpms;
1070 }
1071
1072 /**
1073  * drm_helper_connector_dpms
1074  * @connector affected connector
1075  * @mode DPMS mode
1076  *
1077  * Calls the low-level connector DPMS function, then
1078  * calls appropriate encoder and crtc DPMS functions as well
1079  */
1080 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
1081 {
1082         struct drm_encoder *encoder = connector->encoder;
1083         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
1084         int old_dpms;
1085
1086         if (mode == connector->dpms)
1087                 return;
1088
1089         old_dpms = connector->dpms;
1090         connector->dpms = mode;
1091
1092         /* from off to on, do crtc then encoder */
1093         if (mode < old_dpms) {
1094                 if (crtc) {
1095                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1096                         if (crtc_funcs->dpms)
1097                                 (*crtc_funcs->dpms) (crtc,
1098                                                      drm_helper_choose_crtc_dpms(crtc));
1099                 }
1100                 if (encoder) {
1101                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1102                         if (encoder_funcs->dpms)
1103                                 (*encoder_funcs->dpms) (encoder,
1104                                                         drm_helper_choose_encoder_dpms(encoder));
1105                 }
1106         }
1107
1108         /* from on to off, do encoder then crtc */
1109         if (mode > old_dpms) {
1110                 if (encoder) {
1111                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1112                         if (encoder_funcs->dpms)
1113                                 (*encoder_funcs->dpms) (encoder,
1114                                                         drm_helper_choose_encoder_dpms(encoder));
1115                 }
1116                 if (crtc) {
1117                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1118                         if (crtc_funcs->dpms)
1119                                 (*crtc_funcs->dpms) (crtc,
1120                                                      drm_helper_choose_crtc_dpms(crtc));
1121                 }
1122         }
1123
1124         return;
1125 }
1126 EXPORT_SYMBOL(drm_helper_connector_dpms);
1127
1128 /**
1129  * drm_hotplug_stage_two
1130  * @dev DRM device
1131  * @connector hotpluged connector
1132  *
1133  * LOCKING.
1134  * Caller must hold mode config lock, function might grab struct lock.
1135  *
1136  * Stage two of a hotplug.
1137  *
1138  * RETURNS:
1139  * Zero on success, errno on failure.
1140  */
1141 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1142 {
1143         drm_helper_plugged_event(dev);
1144
1145         return 0;
1146 }
1147 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1148
1149 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1150                                    struct drm_mode_fb_cmd *mode_cmd)
1151 {
1152         fb->width = mode_cmd->width;
1153         fb->height = mode_cmd->height;
1154         fb->pitch = mode_cmd->pitch;
1155         fb->bits_per_pixel = mode_cmd->bpp;
1156         fb->depth = mode_cmd->depth;
1157
1158         return 0;
1159 }
1160 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1161
1162 int drm_helper_resume_force_mode(struct drm_device *dev)
1163 {
1164         struct drm_crtc *crtc;
1165         struct drm_encoder *encoder;
1166         struct drm_encoder_helper_funcs *encoder_funcs;
1167         struct drm_crtc_helper_funcs *crtc_funcs;
1168         int ret;
1169
1170         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1171
1172                 if (!crtc->enabled)
1173                         continue;
1174
1175                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1176                                                crtc->x, crtc->y, crtc->fb);
1177
1178                 if (ret == false)
1179                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1180
1181                 /* Turn off outputs that were already powered off */
1182                 if (drm_helper_choose_crtc_dpms(crtc)) {
1183                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1184
1185                                 if(encoder->crtc != crtc)
1186                                         continue;
1187
1188                                 encoder_funcs = encoder->helper_private;
1189                                 if (encoder_funcs->dpms)
1190                                         (*encoder_funcs->dpms) (encoder,
1191                                                                 drm_helper_choose_encoder_dpms(encoder));
1192
1193                                 crtc_funcs = crtc->helper_private;
1194                                 if (crtc_funcs->dpms)
1195                                         (*crtc_funcs->dpms) (crtc,
1196                                                              drm_helper_choose_crtc_dpms(crtc));
1197                         }
1198                 }
1199         }
1200         /* disable the unused connectors while restoring the modesetting */
1201         drm_helper_disable_unused_functions(dev);
1202         return 0;
1203 }
1204 EXPORT_SYMBOL(drm_helper_resume_force_mode);