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 /*
  37  * Detailed mode info for 800x600@60Hz
  38  */
  39 static struct drm_display_mode std_modes[] = {
  40         { DRM_MODE("800x600", DRM_MODE_TYPE_DEFAULT, 40000, 800, 840,
  41                    968, 1056, 0, 600, 601, 605, 628, 0,
  42                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
  43 };
  44
  45 static void drm_mode_validate_flag(struct drm_connector *connector,
  46                                    int flags)
  47 {
  48         struct drm_display_mode *mode, *t;
  49
  50         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  51                 return;
  52
  53         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  54                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  55                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  56                         mode->status = MODE_NO_INTERLACE;
  57                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  58                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  59                         mode->status = MODE_NO_DBLESCAN;
  60         }
  61
  62         return;
  63 }
  64
  65 /**
  66  * drm_helper_probe_connector_modes - get complete set of display modes
  67  * @dev: DRM device
  68  * @maxX: max width for modes
  69  * @maxY: max height for modes
  70  *
  71  * LOCKING:
  72  * Caller must hold mode config lock.
  73  *
  74  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  75  * modes on them.  Modes will first be added to the connector's probed_modes
  76  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  77  * put into the normal modes list.
  78  *
  79  * Intended to be used either at bootup time or when major configuration
  80  * changes have occurred.
  81  *
  82  * FIXME: take into account monitor limits
  83  *
  84  * RETURNS:
  85  * Number of modes found on @connector.
  86  */
  87 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  88                                             uint32_t maxX, uint32_t maxY)
  89 {
  90         struct drm_device *dev = connector->dev;
  91         struct drm_display_mode *mode, *t;
  92         struct drm_connector_helper_funcs *connector_funcs =
  93                 connector->helper_private;
  94         int count = 0;
  95         int mode_flags = 0;
  96
  97         DRM_DEBUG("%s\n", drm_get_connector_name(connector));
  98         /* set all modes to the unverified state */
  99         list_for_each_entry_safe(mode, t, &connector->modes, head)
 100                 mode->status = MODE_UNVERIFIED;
 101
 102         connector->status = connector->funcs->detect(connector);
 103
 104         if (connector->status == connector_status_disconnected) {
 105                 DRM_DEBUG("%s is disconnected\n",
 106                           drm_get_connector_name(connector));
 107                 /* TODO set EDID to NULL */
 108                 return 0;
 109         }
 110
 111         count = (*connector_funcs->get_modes)(connector);
 112         if (!count)
 113                 return 0;
 114
 115         drm_mode_connector_list_update(connector);
 116
 117         if (maxX && maxY)
 118                 drm_mode_validate_size(dev, &connector->modes, maxX,
 119                                        maxY, 0);
 120
 121         if (connector->interlace_allowed)
 122                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 123         if (connector->doublescan_allowed)
 124                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 125         drm_mode_validate_flag(connector, mode_flags);
 126
 127         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 128                 if (mode->status == MODE_OK)
 129                         mode->status = connector_funcs->mode_valid(connector,
 130                                                                    mode);
 131         }
 132
 133
 134         drm_mode_prune_invalid(dev, &connector->modes, true);
 135
 136         if (list_empty(&connector->modes))
 137                 return 0;
 138
 139         drm_mode_sort(&connector->modes);
 140
 141         DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
 142         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 143                 mode->vrefresh = drm_mode_vrefresh(mode);
 144
 145                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 146                 drm_mode_debug_printmodeline(mode);
 147         }
 148
 149         return count;
 150 }
 151 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 152
 153 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
 154                                       uint32_t maxY)
 155 {
 156         struct drm_connector *connector;
 157         int count = 0;
 158
 159         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 160                 count += drm_helper_probe_single_connector_modes(connector,
 161                                                                  maxX, maxY);
 162         }
 163
 164         return count;
 165 }
 166 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
 167
 168 static void drm_helper_add_std_modes(struct drm_device *dev,
 169                                      struct drm_connector *connector)
 170 {
 171         struct drm_display_mode *mode, *t;
 172         int i;
 173
 174         for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
 175                 struct drm_display_mode *stdmode;
 176
 177                 /*
 178                  * When no valid EDID modes are available we end up
 179                  * here and bailed in the past, now we add some standard
 180                  * modes and move on.
 181                  */
 182                 stdmode = drm_mode_duplicate(dev, &std_modes[i]);
 183                 drm_mode_probed_add(connector, stdmode);
 184                 drm_mode_list_concat(&connector->probed_modes,
 185                                      &connector->modes);
 186
 187                 DRM_DEBUG("Adding mode %s to %s\n", stdmode->name,
 188                           drm_get_connector_name(connector));
 189         }
 190         drm_mode_sort(&connector->modes);
 191
 192         DRM_DEBUG("Added std modes on %s\n", drm_get_connector_name(connector));
 193         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 194                 mode->vrefresh = drm_mode_vrefresh(mode);
 195
 196                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 197                 drm_mode_debug_printmodeline(mode);
 198         }
 199 }
 200
 201 /**
 202  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 203  * @crtc: CRTC to check
 204  *
 205  * LOCKING:
 206  * Caller must hold mode config lock.
 207  *
 208  * Walk @crtc's DRM device's mode_config and see if it's in use.
 209  *
 210  * RETURNS:
 211  * True if @crtc is part of the mode_config, false otherwise.
 212  */
 213 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 214 {
 215         struct drm_encoder *encoder;
 216         struct drm_device *dev = crtc->dev;
 217         /* FIXME: Locking around list access? */
 218         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 219                 if (encoder->crtc == crtc)
 220                         return true;
 221         return false;
 222 }
 223 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 224
 225 /**
 226  * drm_disable_unused_functions - disable unused objects
 227  * @dev: DRM device
 228  *
 229  * LOCKING:
 230  * Caller must hold mode config lock.
 231  *
 232  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 233  * by calling its dpms function, which should power it off.
 234  */
 235 void drm_helper_disable_unused_functions(struct drm_device *dev)
 236 {
 237         struct drm_encoder *encoder;
 238         struct drm_encoder_helper_funcs *encoder_funcs;
 239         struct drm_crtc *crtc;
 240
 241         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 242                 encoder_funcs = encoder->helper_private;
 243                 if (!encoder->crtc)
 244                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 245         }
 246
 247         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 248                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 249                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 250                 if (!crtc->enabled) {
 251                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 252                         crtc->fb = NULL;
 253                 }
 254         }
 255 }
 256 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 257
 258 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 259 {
 260         struct drm_display_mode *mode;
 261
 262         list_for_each_entry(mode, &connector->modes, head) {
 263                 if (drm_mode_width(mode) > width ||
 264                     drm_mode_height(mode) > height)
 265                         continue;
 266                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 267                         return mode;
 268         }
 269         return NULL;
 270 }
 271
 272 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 273 {
 274         bool enable;
 275
 276         if (strict) {
 277                 enable = connector->status == connector_status_connected;
 278         } else {
 279                 enable = connector->status != connector_status_disconnected;
 280         }
 281         return enable;
 282 }
 283
 284 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
 285 {
 286         bool any_enabled = false;
 287         struct drm_connector *connector;
 288         int i = 0;
 289
 290         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 291                 enabled[i] = drm_connector_enabled(connector, true);
 292                 DRM_DEBUG("connector %d enabled? %s\n", connector->base.id,
 293                           enabled[i] ? "yes" : "no");
 294                 any_enabled |= enabled[i];
 295                 i++;
 296         }
 297
 298         if (any_enabled)
 299                 return;
 300
 301         i = 0;
 302         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 303                 enabled[i] = drm_connector_enabled(connector, false);
 304                 i++;
 305         }
 306 }
 307
 308 static bool drm_target_preferred(struct drm_device *dev,
 309                                  struct drm_display_mode **modes,
 310                                  bool *enabled, int width, int height)
 311 {
 312         struct drm_connector *connector;
 313         int i = 0;
 314
 315         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 316
 317                 if (enabled[i] == false) {
 318                         i++;
 319                         continue;
 320                 }
 321
 322                 DRM_DEBUG("looking for preferred mode on connector %d\n",
 323                           connector->base.id);
 324
 325                 modes[i] = drm_has_preferred_mode(connector, width, height);
 326                 /* No preferred modes, pick one off the list */
 327                 if (!modes[i] && !list_empty(&connector->modes)) {
 328                         list_for_each_entry(modes[i], &connector->modes, head)
 329                                 break;
 330                 }
 331                 DRM_DEBUG("found mode %s\n", modes[i] ? modes[i]->name :
 332                           "none");
 333                 i++;
 334         }
 335         return true;
 336 }
 337
 338 static int drm_pick_crtcs(struct drm_device *dev,
 339                           struct drm_crtc **best_crtcs,
 340                           struct drm_display_mode **modes,
 341                           int n, int width, int height)
 342 {
 343         int c, o;
 344         struct drm_connector *connector;
 345         struct drm_connector_helper_funcs *connector_funcs;
 346         struct drm_encoder *encoder;
 347         struct drm_crtc *best_crtc;
 348         int my_score, best_score, score;
 349         struct drm_crtc **crtcs, *crtc;
 350
 351         if (n == dev->mode_config.num_connector)
 352                 return 0;
 353         c = 0;
 354         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 355                 if (c == n)
 356                         break;
 357                 c++;
 358         }
 359
 360         best_crtcs[n] = NULL;
 361         best_crtc = NULL;
 362         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
 363         if (modes[n] == NULL)
 364                 return best_score;
 365
 366         crtcs = kmalloc(dev->mode_config.num_connector *
 367                         sizeof(struct drm_crtc *), GFP_KERNEL);
 368         if (!crtcs)
 369                 return best_score;
 370
 371         my_score = 1;
 372         if (connector->status == connector_status_connected)
 373                 my_score++;
 374         if (drm_has_preferred_mode(connector, width, height))
 375                 my_score++;
 376
 377         connector_funcs = connector->helper_private;
 378         encoder = connector_funcs->best_encoder(connector);
 379         if (!encoder)
 380                 goto out;
 381
 382         connector->encoder = encoder;
 383
 384         /* select a crtc for this connector and then attempt to configure
 385            remaining connectors */
 386         c = 0;
 387         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 388
 389                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
 390                         c++;
 391                         continue;
 392                 }
 393
 394                 for (o = 0; o < n; o++)
 395                         if (best_crtcs[o] == crtc)
 396                                 break;
 397
 398                 if (o < n) {
 399                         /* ignore cloning for now */
 400                         c++;
 401                         continue;
 402                 }
 403
 404                 crtcs[n] = crtc;
 405                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
 406                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
 407                                                   width, height);
 408                 if (score > best_score) {
 409                         best_crtc = crtc;
 410                         best_score = score;
 411                         memcpy(best_crtcs, crtcs,
 412                                dev->mode_config.num_connector *
 413                                sizeof(struct drm_crtc *));
 414                 }
 415                 c++;
 416         }
 417 out:
 418         kfree(crtcs);
 419         return best_score;
 420 }
 421
 422 static void drm_setup_crtcs(struct drm_device *dev)
 423 {
 424         struct drm_crtc **crtcs;
 425         struct drm_display_mode **modes;
 426         struct drm_encoder *encoder;
 427         struct drm_connector *connector;
 428         bool *enabled;
 429         int width, height;
 430         int i, ret;
 431
 432         DRM_DEBUG("\n");
 433
 434         width = dev->mode_config.max_width;
 435         height = dev->mode_config.max_height;
 436
 437         /* clean out all the encoder/crtc combos */
 438         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 439                 encoder->crtc = NULL;
 440         }
 441
 442         crtcs = kcalloc(dev->mode_config.num_connector,
 443                         sizeof(struct drm_crtc *), GFP_KERNEL);
 444         modes = kcalloc(dev->mode_config.num_connector,
 445                         sizeof(struct drm_display_mode *), GFP_KERNEL);
 446         enabled = kcalloc(dev->mode_config.num_connector,
 447                           sizeof(bool), GFP_KERNEL);
 448
 449         drm_enable_connectors(dev, enabled);
 450
 451         ret = drm_target_preferred(dev, modes, enabled, width, height);
 452         if (!ret)
 453                 DRM_ERROR("Unable to find initial modes\n");
 454
 455         DRM_DEBUG("picking CRTCs for %dx%d config\n", width, height);
 456
 457         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
 458
 459         i = 0;
 460         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 461                 struct drm_display_mode *mode = modes[i];
 462                 struct drm_crtc *crtc = crtcs[i];
 463
 464                 if (connector->encoder == NULL) {
 465                         i++;
 466                         continue;
 467                 }
 468
 469                 if (mode && crtc) {
 470                         DRM_DEBUG("desired mode %s set on crtc %d\n",
 471                                   mode->name, crtc->base.id);
 472                         crtc->desired_mode = mode;
 473                         connector->encoder->crtc = crtc;
 474                 } else
 475                         connector->encoder->crtc = NULL;
 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         bool depth_changed, bpp_changed;
 565
 566         adjusted_mode = drm_mode_duplicate(dev, mode);
 567
 568         crtc->enabled = drm_helper_crtc_in_use(crtc);
 569
 570         if (!crtc->enabled)
 571                 return true;
 572
 573         if (old_fb && crtc->fb) {
 574                 depth_changed = (old_fb->depth != crtc->fb->depth);
 575                 bpp_changed = (old_fb->bits_per_pixel !=
 576                                crtc->fb->bits_per_pixel);
 577         } else {
 578                 depth_changed = true;
 579                 bpp_changed = true;
 580         }
 581
 582         saved_mode = crtc->mode;
 583         saved_x = crtc->x;
 584         saved_y = crtc->y;
 585
 586         /* Update crtc values up front so the driver can rely on them for mode
 587          * setting.
 588          */
 589         crtc->mode = *mode;
 590         crtc->x = x;
 591         crtc->y = y;
 592
 593         if (drm_mode_equal(&saved_mode, &crtc->mode)) {
 594                 if (saved_x != crtc->x || saved_y != crtc->y ||
 595                     depth_changed || bpp_changed) {
 596                         ret = !crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y,
 597                                                          old_fb);
 598                         goto done;
 599                 }
 600         }
 601
 602         /* Pass our mode to the connectors and the CRTC to give them a chance to
 603          * adjust it according to limitations or connector properties, and also
 604          * a chance to reject the mode entirely.
 605          */
 606         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 607
 608                 if (encoder->crtc != crtc)
 609                         continue;
 610                 encoder_funcs = encoder->helper_private;
 611                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 612                                                       adjusted_mode))) {
 613                         goto done;
 614                 }
 615         }
 616
 617         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 618                 goto done;
 619         }
 620
 621         /* Prepare the encoders and CRTCs before setting the mode. */
 622         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 623
 624                 if (encoder->crtc != crtc)
 625                         continue;
 626                 encoder_funcs = encoder->helper_private;
 627                 /* Disable the encoders as the first thing we do. */
 628                 encoder_funcs->prepare(encoder);
 629         }
 630
 631         drm_crtc_prepare_encoders(dev);
 632
 633         crtc_funcs->prepare(crtc);
 634
 635         /* Set up the DPLL and any encoders state that needs to adjust or depend
 636          * on the DPLL.
 637          */
 638         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 639         if (!ret)
 640             goto done;
 641
 642         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 643
 644                 if (encoder->crtc != crtc)
 645                         continue;
 646
 647                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
 648                          mode->name, mode->base.id);
 649                 encoder_funcs = encoder->helper_private;
 650                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 651         }
 652
 653         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 654         crtc_funcs->commit(crtc);
 655
 656         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 657
 658                 if (encoder->crtc != crtc)
 659                         continue;
 660
 661                 encoder_funcs = encoder->helper_private;
 662                 encoder_funcs->commit(encoder);
 663
 664         }
 665
 666         /* XXX free adjustedmode */
 667         drm_mode_destroy(dev, adjusted_mode);
 668         /* FIXME: add subpixel order */
 669 done:
 670         if (!ret) {
 671                 crtc->mode = saved_mode;
 672                 crtc->x = saved_x;
 673                 crtc->y = saved_y;
 674         }
 675
 676         return ret;
 677 }
 678 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 679
 680
 681 /**
 682  * drm_crtc_helper_set_config - set a new config from userspace
 683  * @crtc: CRTC to setup
 684  * @crtc_info: user provided configuration
 685  * @new_mode: new mode to set
 686  * @connector_set: set of connectors for the new config
 687  * @fb: new framebuffer
 688  *
 689  * LOCKING:
 690  * Caller must hold mode config lock.
 691  *
 692  * Setup a new configuration, provided by the user in @crtc_info, and enable
 693  * it.
 694  *
 695  * RETURNS:
 696  * Zero. (FIXME)
 697  */
 698 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 699 {
 700         struct drm_device *dev;
 701         struct drm_crtc **save_crtcs, *new_crtc;
 702         struct drm_encoder **save_encoders, *new_encoder;
 703         struct drm_framebuffer *old_fb = NULL;
 704         bool save_enabled;
 705         bool mode_changed = false;
 706         bool fb_changed = false;
 707         struct drm_connector *connector;
 708         int count = 0, ro, fail = 0;
 709         struct drm_crtc_helper_funcs *crtc_funcs;
 710         int ret = 0;
 711
 712         DRM_DEBUG("\n");
 713
 714         if (!set)
 715                 return -EINVAL;
 716
 717         if (!set->crtc)
 718                 return -EINVAL;
 719
 720         if (!set->crtc->helper_private)
 721                 return -EINVAL;
 722
 723         crtc_funcs = set->crtc->helper_private;
 724
 725         DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %d (x, y) (%i, %i)\n",
 726                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
 727                   (int)set->num_connectors, set->x, set->y);
 728
 729         dev = set->crtc->dev;
 730
 731         /* save previous config */
 732         save_enabled = set->crtc->enabled;
 733
 734         /*
 735          * We do mode_config.num_connectors here since we'll look at the
 736          * CRTC and encoder associated with each connector later.
 737          */
 738         save_crtcs = kzalloc(dev->mode_config.num_connector *
 739                              sizeof(struct drm_crtc *), GFP_KERNEL);
 740         if (!save_crtcs)
 741                 return -ENOMEM;
 742
 743         save_encoders = kzalloc(dev->mode_config.num_connector *
 744                                 sizeof(struct drm_encoders *), GFP_KERNEL);
 745         if (!save_encoders) {
 746                 kfree(save_crtcs);
 747                 return -ENOMEM;
 748         }
 749
 750         /* We should be able to check here if the fb has the same properties
 751          * and then just flip_or_move it */
 752         if (set->crtc->fb != set->fb) {
 753                 /* If we have no fb then treat it as a full mode set */
 754                 if (set->crtc->fb == NULL) {
 755                         DRM_DEBUG("crtc has no fb, full mode set\n");
 756                         mode_changed = true;
 757                 } else if ((set->fb->bits_per_pixel !=
 758                          set->crtc->fb->bits_per_pixel) ||
 759                          set->fb->depth != set->crtc->fb->depth)
 760                         fb_changed = true;
 761                 else
 762                         fb_changed = true;
 763         }
 764
 765         if (set->x != set->crtc->x || set->y != set->crtc->y)
 766                 fb_changed = true;
 767
 768         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 769                 DRM_DEBUG("modes are different, full mode set\n");
 770                 drm_mode_debug_printmodeline(&set->crtc->mode);
 771                 drm_mode_debug_printmodeline(set->mode);
 772                 mode_changed = true;
 773         }
 774
 775         /* a) traverse passed in connector list and get encoders for them */
 776         count = 0;
 777         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 778                 struct drm_connector_helper_funcs *connector_funcs =
 779                         connector->helper_private;
 780                 save_encoders[count++] = connector->encoder;
 781                 new_encoder = connector->encoder;
 782                 for (ro = 0; ro < set->num_connectors; ro++) {
 783                         if (set->connectors[ro] == connector) {
 784                                 new_encoder = connector_funcs->best_encoder(connector);
 785                                 /* if we can't get an encoder for a connector
 786                                    we are setting now - then fail */
 787                                 if (new_encoder == NULL)
 788                                         /* don't break so fail path works correct */
 789                                         fail = 1;
 790                                 break;
 791                         }
 792                 }
 793
 794                 if (new_encoder != connector->encoder) {
 795                         DRM_DEBUG("encoder changed, full mode switch\n");
 796                         mode_changed = true;
 797                         connector->encoder = new_encoder;
 798                 }
 799         }
 800
 801         if (fail) {
 802                 ret = -EINVAL;
 803                 goto fail_no_encoder;
 804         }
 805
 806         count = 0;
 807         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 808                 if (!connector->encoder)
 809                         continue;
 810
 811                 save_crtcs[count++] = connector->encoder->crtc;
 812
 813                 if (connector->encoder->crtc == set->crtc)
 814                         new_crtc = NULL;
 815                 else
 816                         new_crtc = connector->encoder->crtc;
 817
 818                 for (ro = 0; ro < set->num_connectors; ro++) {
 819                         if (set->connectors[ro] == connector)
 820                                 new_crtc = set->crtc;
 821                 }
 822
 823                 /* Make sure the new CRTC will work with the encoder */
 824                 if (new_crtc &&
 825                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 826                         ret = -EINVAL;
 827                         goto fail_set_mode;
 828                 }
 829                 if (new_crtc != connector->encoder->crtc) {
 830                         DRM_DEBUG("crtc changed, full mode switch\n");
 831                         mode_changed = true;
 832                         connector->encoder->crtc = new_crtc;
 833                 }
 834                 DRM_DEBUG("setting connector %d crtc to %p\n",
 835                           connector->base.id, new_crtc);
 836         }
 837
 838         /* mode_set_base is not a required function */
 839         if (fb_changed && !crtc_funcs->mode_set_base)
 840                 mode_changed = true;
 841
 842         if (mode_changed) {
 843                 old_fb = set->crtc->fb;
 844                 set->crtc->fb = set->fb;
 845                 set->crtc->enabled = (set->mode != NULL);
 846                 if (set->mode != NULL) {
 847                         DRM_DEBUG("attempting to set mode from userspace\n");
 848                         drm_mode_debug_printmodeline(set->mode);
 849                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 850                                                       set->x, set->y,
 851                                                       old_fb)) {
 852                                 DRM_ERROR("failed to set mode on crtc %p\n",
 853                                           set->crtc);
 854                                 ret = -EINVAL;
 855                                 goto fail_set_mode;
 856                         }
 857                         /* TODO are these needed? */
 858                         set->crtc->desired_x = set->x;
 859                         set->crtc->desired_y = set->y;
 860                         set->crtc->desired_mode = set->mode;
 861                 }
 862                 drm_helper_disable_unused_functions(dev);
 863         } else if (fb_changed) {
 864                 old_fb = set->crtc->fb;
 865                 if (set->crtc->fb != set->fb)
 866                         set->crtc->fb = set->fb;
 867                 ret = crtc_funcs->mode_set_base(set->crtc,
 868                                                 set->x, set->y, old_fb);
 869                 if (ret != 0)
 870                     goto fail_set_mode;
 871         }
 872
 873         kfree(save_encoders);
 874         kfree(save_crtcs);
 875         return 0;
 876
 877 fail_set_mode:
 878         set->crtc->enabled = save_enabled;
 879         set->crtc->fb = old_fb;
 880         count = 0;
 881         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 882                 if (!connector->encoder)
 883                         continue;
 884
 885                 connector->encoder->crtc = save_crtcs[count++];
 886         }
 887 fail_no_encoder:
 888         kfree(save_crtcs);
 889         count = 0;
 890         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 891                 connector->encoder = save_encoders[count++];
 892         }
 893         kfree(save_encoders);
 894         return ret;
 895 }
 896 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 897
 898 bool drm_helper_plugged_event(struct drm_device *dev)
 899 {
 900         DRM_DEBUG("\n");
 901
 902         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
 903                                          dev->mode_config.max_height);
 904
 905         drm_setup_crtcs(dev);
 906
 907         /* alert the driver fb layer */
 908         dev->mode_config.funcs->fb_changed(dev);
 909
 910         /* FIXME: send hotplug event */
 911         return true;
 912 }
 913 /**
 914  * drm_initial_config - setup a sane initial connector configuration
 915  * @dev: DRM device
 916  *
 917  * LOCKING:
 918  * Called at init time, must take mode config lock.
 919  *
 920  * Scan the CRTCs and connectors and try to put together an initial setup.
 921  * At the moment, this is a cloned configuration across all heads with
 922  * a new framebuffer object as the backing store.
 923  *
 924  * RETURNS:
 925  * Zero if everything went ok, nonzero otherwise.
 926  */
 927 bool drm_helper_initial_config(struct drm_device *dev)
 928 {
 929         struct drm_connector *connector;
 930         int count = 0;
 931
 932         count = drm_helper_probe_connector_modes(dev,
 933                                                  dev->mode_config.max_width,
 934                                                  dev->mode_config.max_height);
 935
 936         /*
 937          * None of the available connectors had any modes, so add some
 938          * and try to light them up anyway
 939          */
 940         if (!count) {
 941                 DRM_ERROR("connectors have no modes, using standard modes\n");
 942                 list_for_each_entry(connector,
 943                                     &dev->mode_config.connector_list,
 944                                     head)
 945                         drm_helper_add_std_modes(dev, connector);
 946         }
 947
 948         drm_setup_crtcs(dev);
 949
 950         /* alert the driver fb layer */
 951         dev->mode_config.funcs->fb_changed(dev);
 952
 953         return 0;
 954 }
 955 EXPORT_SYMBOL(drm_helper_initial_config);
 956
 957 /**
 958  * drm_hotplug_stage_two
 959  * @dev DRM device
 960  * @connector hotpluged connector
 961  *
 962  * LOCKING.
 963  * Caller must hold mode config lock, function might grab struct lock.
 964  *
 965  * Stage two of a hotplug.
 966  *
 967  * RETURNS:
 968  * Zero on success, errno on failure.
 969  */
 970 int drm_helper_hotplug_stage_two(struct drm_device *dev)
 971 {
 972         drm_helper_plugged_event(dev);
 973
 974         return 0;
 975 }
 976 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
 977
 978 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 979                                    struct drm_mode_fb_cmd *mode_cmd)
 980 {
 981         fb->width = mode_cmd->width;
 982         fb->height = mode_cmd->height;
 983         fb->pitch = mode_cmd->pitch;
 984         fb->bits_per_pixel = mode_cmd->bpp;
 985         fb->depth = mode_cmd->depth;
 986
 987         return 0;
 988 }
 989 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 990
 991 int drm_helper_resume_force_mode(struct drm_device *dev)
 992 {
 993         struct drm_crtc *crtc;
 994         int ret;
 995
 996         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 997
 998                 if (!crtc->enabled)
 999                         continue;
1000
1001                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1002                                                crtc->x, crtc->y, crtc->fb);
1003
1004                 if (ret == false)
1005                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1006         }
1007         return 0;
1008 }
1009 EXPORT_SYMBOL(drm_helper_resume_force_mode);