sys/dev/drm/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  *
   5  * DRM core CRTC related functions
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that copyright
  10  * notice and this permission notice appear in supporting documentation, and
  11  * that the name of the copyright holders not be used in advertising or
  12  * publicity pertaining to distribution of the software without specific,
  13  * written prior permission.  The copyright holders make no representations
  14  * about the suitability of this software for any purpose.  It is provided "as
  15  * is" without express or implied warranty.
  16  *
  17  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23  * OF THIS SOFTWARE.
  24  *
  25  * Authors:
  26  *      Keith Packard
  27  *      Eric Anholt <eric@anholt.net>
  28  *      Dave Airlie <airlied@linux.ie>
  29  *      Jesse Barnes <jesse.barnes@intel.com>
  30  */
  31
  32 #include <linux/export.h>
  33 #include <linux/moduleparam.h>
  34
  35 #include <drm/drmP.h>
  36 #include <drm/drm_crtc.h>
  37 #include <uapi_drm/drm_fourcc.h>
  38 #include <drm/drm_crtc_helper.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_edid.h>
  41
  42 bool
  43 drm_fetch_cmdline_mode_from_kenv(struct drm_connector *connector,
  44     struct drm_cmdline_mode *cmdline_mode)
  45 {
  46         char *tun_var_name, *tun_mode;
  47         static const char tun_prefix[] = "drm_mode.";
  48         bool res;
  49
  50         res = false;
  51         tun_var_name = kmalloc(sizeof(tun_prefix) +
  52             strlen(drm_get_connector_name(connector)), M_TEMP, M_WAITOK);
  53         strcpy(tun_var_name, tun_prefix);
  54         strcat(tun_var_name, drm_get_connector_name(connector));
  55         tun_mode = kgetenv(tun_var_name);
  56         if (tun_mode != NULL) {
  57                 res = drm_mode_parse_command_line_for_connector(tun_mode,
  58                     connector, cmdline_mode);
  59                 kfreeenv(tun_mode);
  60         }
  61         drm_free(tun_var_name, M_TEMP);
  62         return (res);
  63 }
  64
  65 /**
  66  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  67  *                                              connector list
  68  * @dev: drm device to operate on
  69  *
  70  * Some userspace presumes that the first connected connector is the main
  71  * display, where it's supposed to display e.g. the login screen. For
  72  * laptops, this should be the main panel. Use this function to sort all
  73  * (eDP/LVDS) panels to the front of the connector list, instead of
  74  * painstakingly trying to initialize them in the right order.
  75  */
  76 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  77 {
  78         struct drm_connector *connector, *tmp;
  79         struct list_head panel_list;
  80
  81         INIT_LIST_HEAD(&panel_list);
  82
  83         list_for_each_entry_safe(connector, tmp,
  84                                  &dev->mode_config.connector_list, head) {
  85                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  86                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  87                         list_move_tail(&connector->head, &panel_list);
  88         }
  89
  90         list_splice(&panel_list, &dev->mode_config.connector_list);
  91 }
  92 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  93
  94 static bool drm_kms_helper_poll = true;
  95
  96 static void drm_mode_validate_flag(struct drm_connector *connector,
  97                                    int flags)
  98 {
  99         struct drm_display_mode *mode;
 100
 101         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
 102                 return;
 103
 104         list_for_each_entry(mode, &connector->modes, head) {
 105                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
 106                                 !(flags & DRM_MODE_FLAG_INTERLACE))
 107                         mode->status = MODE_NO_INTERLACE;
 108                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
 109                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
 110                         mode->status = MODE_NO_DBLESCAN;
 111         }
 112
 113         return;
 114 }
 115
 116 /**
 117  * drm_helper_probe_single_connector_modes - get complete set of display modes
 118  * @connector: connector to probe
 119  * @maxX: max width for modes
 120  * @maxY: max height for modes
 121  *
 122  * LOCKING:
 123  * Caller must hold mode config lock.
 124  *
 125  * Based on the helper callbacks implemented by @connector try to detect all
 126  * valid modes.  Modes will first be added to the connector's probed_modes list,
 127  * then culled (based on validity and the @maxX, @maxY parameters) and put into
 128  * the normal modes list.
 129  *
 130  * Intended to be use as a generic implementation of the ->probe() @connector
 131  * callback for drivers that use the crtc helpers for output mode filtering and
 132  * detection.
 133  *
 134  * RETURNS:
 135  * Number of modes found on @connector.
 136  */
 137 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 138                                             uint32_t maxX, uint32_t maxY)
 139 {
 140         struct drm_device *dev = connector->dev;
 141         struct drm_display_mode *mode;
 142         struct drm_connector_helper_funcs *connector_funcs =
 143                 connector->helper_private;
 144         int count = 0;
 145         int mode_flags = 0;
 146         bool verbose_prune = true;
 147
 148         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 149                         drm_get_connector_name(connector));
 150         /* set all modes to the unverified state */
 151         list_for_each_entry(mode, &connector->modes, head)
 152                 mode->status = MODE_UNVERIFIED;
 153
 154         if (connector->force) {
 155                 if (connector->force == DRM_FORCE_ON)
 156                         connector->status = connector_status_connected;
 157                 else
 158                         connector->status = connector_status_disconnected;
 159                 if (connector->funcs->force)
 160                         connector->funcs->force(connector);
 161         } else {
 162                 connector->status = connector->funcs->detect(connector, true);
 163         }
 164
 165         /* Re-enable polling in case the global poll config changed. */
 166         if (drm_kms_helper_poll != dev->mode_config.poll_running)
 167                 drm_kms_helper_poll_enable(dev);
 168
 169         dev->mode_config.poll_running = drm_kms_helper_poll;
 170
 171         if (connector->status == connector_status_disconnected) {
 172                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 173                         connector->base.id, drm_get_connector_name(connector));
 174                 drm_mode_connector_update_edid_property(connector, NULL);
 175                 verbose_prune = false;
 176                 goto prune;
 177         }
 178
 179 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 180         count = drm_load_edid_firmware(connector);
 181         if (count == 0)
 182 #endif
 183                 count = (*connector_funcs->get_modes)(connector);
 184
 185         if (count == 0 && connector->status == connector_status_connected)
 186                 count = drm_add_modes_noedid(connector, 1024, 768);
 187         if (count == 0)
 188                 goto prune;
 189
 190         drm_mode_connector_list_update(connector);
 191
 192         if (maxX && maxY)
 193                 drm_mode_validate_size(dev, &connector->modes, maxX,
 194                                        maxY, 0);
 195
 196         if (connector->interlace_allowed)
 197                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 198         if (connector->doublescan_allowed)
 199                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 200         drm_mode_validate_flag(connector, mode_flags);
 201
 202         list_for_each_entry(mode, &connector->modes, head) {
 203                 if (mode->status == MODE_OK)
 204                         mode->status = connector_funcs->mode_valid(connector,
 205                                                                    mode);
 206         }
 207
 208 prune:
 209         drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
 210
 211         if (list_empty(&connector->modes))
 212                 return 0;
 213
 214         drm_mode_sort(&connector->modes);
 215
 216         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 217                         drm_get_connector_name(connector));
 218         list_for_each_entry(mode, &connector->modes, head) {
 219                 mode->vrefresh = drm_mode_vrefresh(mode);
 220
 221                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 222                 drm_mode_debug_printmodeline(mode);
 223         }
 224
 225         return count;
 226 }
 227 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
 228
 229 /**
 230  * drm_helper_encoder_in_use - check if a given encoder is in use
 231  * @encoder: encoder to check
 232  *
 233  * LOCKING:
 234  * Caller must hold mode config lock.
 235  *
 236  * Walk @encoders's DRM device's mode_config and see if it's in use.
 237  *
 238  * RETURNS:
 239  * True if @encoder is part of the mode_config, false otherwise.
 240  */
 241 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 242 {
 243         struct drm_connector *connector;
 244         struct drm_device *dev = encoder->dev;
 245         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 246                 if (connector->encoder == encoder)
 247                         return true;
 248         return false;
 249 }
 250 EXPORT_SYMBOL(drm_helper_encoder_in_use);
 251
 252 /**
 253  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 254  * @crtc: CRTC to check
 255  *
 256  * LOCKING:
 257  * Caller must hold mode config lock.
 258  *
 259  * Walk @crtc's DRM device's mode_config and see if it's in use.
 260  *
 261  * RETURNS:
 262  * True if @crtc is part of the mode_config, false otherwise.
 263  */
 264 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 265 {
 266         struct drm_encoder *encoder;
 267         struct drm_device *dev = crtc->dev;
 268         /* FIXME: Locking around list access? */
 269         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 270                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 271                         return true;
 272         return false;
 273 }
 274 EXPORT_SYMBOL(drm_helper_crtc_in_use);
 275
 276 static void
 277 drm_encoder_disable(struct drm_encoder *encoder)
 278 {
 279         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 280
 281         if (encoder_funcs->disable)
 282                 (*encoder_funcs->disable)(encoder);
 283         else
 284                 if (encoder_funcs->dpms)
 285                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 286 }
 287
 288 /**
 289  * drm_helper_disable_unused_functions - disable unused objects
 290  * @dev: DRM device
 291  *
 292  * LOCKING:
 293  * Caller must hold mode config lock.
 294  *
 295  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 296  * by calling its dpms function, which should power it off.
 297  */
 298 void drm_helper_disable_unused_functions(struct drm_device *dev)
 299 {
 300         struct drm_encoder *encoder;
 301         struct drm_connector *connector;
 302         struct drm_crtc *crtc;
 303
 304         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 305                 if (!connector->encoder)
 306                         continue;
 307                 if (connector->status == connector_status_disconnected)
 308                         connector->encoder = NULL;
 309         }
 310
 311         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 312                 if (!drm_helper_encoder_in_use(encoder)) {
 313                         drm_encoder_disable(encoder);
 314                         /* disconnector encoder from any connector */
 315                         encoder->crtc = NULL;
 316                 }
 317         }
 318
 319         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 320                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 321                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 322                 if (!crtc->enabled) {
 323                         if (crtc_funcs->disable)
 324                                 (*crtc_funcs->disable)(crtc);
 325                         else
 326                                 if (crtc_funcs->dpms)
 327                                         (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 328                         crtc->fb = NULL;
 329                 }
 330         }
 331 }
 332 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 333
 334 /**
 335  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 336  * @encoder: encoder to test
 337  * @crtc: crtc to test
 338  *
 339  * Return false if @encoder can't be driven by @crtc, true otherwise.
 340  */
 341 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 342                                 struct drm_crtc *crtc)
 343 {
 344         struct drm_device *dev;
 345         struct drm_crtc *tmp;
 346         int crtc_mask = 1;
 347
 348         WARN(!crtc, "checking null crtc?\n");
 349
 350         dev = crtc->dev;
 351
 352         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 353                 if (tmp == crtc)
 354                         break;
 355                 crtc_mask <<= 1;
 356         }
 357
 358         if (encoder->possible_crtcs & crtc_mask)
 359                 return true;
 360         return false;
 361 }
 362
 363 /*
 364  * Check the CRTC we're going to map each output to vs. its current
 365  * CRTC.  If they don't match, we have to disable the output and the CRTC
 366  * since the driver will have to re-route things.
 367  */
 368 static void
 369 drm_crtc_prepare_encoders(struct drm_device *dev)
 370 {
 371         struct drm_encoder_helper_funcs *encoder_funcs;
 372         struct drm_encoder *encoder;
 373
 374         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 375                 encoder_funcs = encoder->helper_private;
 376                 /* Disable unused encoders */
 377                 if (encoder->crtc == NULL)
 378                         drm_encoder_disable(encoder);
 379                 /* Disable encoders whose CRTC is about to change */
 380                 if (encoder_funcs->get_crtc &&
 381                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 382                         drm_encoder_disable(encoder);
 383         }
 384 }
 385
 386 /**
 387  * drm_crtc_helper_set_mode - internal helper to set a mode
 388  * @crtc: CRTC to program
 389  * @mode: mode to use
 390  * @x: horizontal offset into the surface
 391  * @y: vertical offset into the surface
 392  * @old_fb: old framebuffer, for cleanup
 393  *
 394  * LOCKING:
 395  * Caller must hold mode config lock.
 396  *
 397  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 398  * to fixup or reject the mode prior to trying to set it. This is an internal
 399  * helper that drivers could e.g. use to update properties that require the
 400  * entire output pipe to be disabled and re-enabled in a new configuration. For
 401  * example for changing whether audio is enabled on a hdmi link or for changing
 402  * panel fitter or dither attributes. It is also called by the
 403  * drm_crtc_helper_set_config() helper function to drive the mode setting
 404  * sequence.
 405  *
 406  * RETURNS:
 407  * True if the mode was set successfully, or false otherwise.
 408  */
 409 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 410                               struct drm_display_mode *mode,
 411                               int x, int y,
 412                               struct drm_framebuffer *old_fb)
 413 {
 414         struct drm_device *dev = crtc->dev;
 415         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 416         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 417         struct drm_encoder_helper_funcs *encoder_funcs;
 418         int saved_x, saved_y;
 419         struct drm_encoder *encoder;
 420         bool ret = true;
 421
 422         crtc->enabled = drm_helper_crtc_in_use(crtc);
 423         if (!crtc->enabled)
 424                 return true;
 425
 426         adjusted_mode = drm_mode_duplicate(dev, mode);
 427         if (!adjusted_mode)
 428                 return false;
 429
 430         saved_hwmode = crtc->hwmode;
 431         saved_mode = crtc->mode;
 432         saved_x = crtc->x;
 433         saved_y = crtc->y;
 434
 435         /* Update crtc values up front so the driver can rely on them for mode
 436          * setting.
 437          */
 438         crtc->mode = *mode;
 439         crtc->x = x;
 440         crtc->y = y;
 441
 442         /* Pass our mode to the connectors and the CRTC to give them a chance to
 443          * adjust it according to limitations or connector properties, and also
 444          * a chance to reject the mode entirely.
 445          */
 446         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 447
 448                 if (encoder->crtc != crtc)
 449                         continue;
 450                 encoder_funcs = encoder->helper_private;
 451                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 452                                                       adjusted_mode))) {
 453                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 454                         goto done;
 455                 }
 456         }
 457
 458         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 459                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 460                 goto done;
 461         }
 462         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 463
 464         /* Prepare the encoders and CRTCs before setting the mode. */
 465         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 466
 467                 if (encoder->crtc != crtc)
 468                         continue;
 469                 encoder_funcs = encoder->helper_private;
 470                 /* Disable the encoders as the first thing we do. */
 471                 encoder_funcs->prepare(encoder);
 472         }
 473
 474         drm_crtc_prepare_encoders(dev);
 475
 476         crtc_funcs->prepare(crtc);
 477
 478         /* Set up the DPLL and any encoders state that needs to adjust or depend
 479          * on the DPLL.
 480          */
 481         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 482         if (!ret)
 483             goto done;
 484
 485         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 486
 487                 if (encoder->crtc != crtc)
 488                         continue;
 489
 490                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 491                         encoder->base.id, drm_get_encoder_name(encoder),
 492                         mode->base.id, mode->name);
 493                 encoder_funcs = encoder->helper_private;
 494                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 495         }
 496
 497         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 498         crtc_funcs->commit(crtc);
 499
 500         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 501
 502                 if (encoder->crtc != crtc)
 503                         continue;
 504
 505                 encoder_funcs = encoder->helper_private;
 506                 encoder_funcs->commit(encoder);
 507
 508         }
 509
 510         /* Store real post-adjustment hardware mode. */
 511         crtc->hwmode = *adjusted_mode;
 512
 513         /* Calculate and store various constants which
 514          * are later needed by vblank and swap-completion
 515          * timestamping. They are derived from true hwmode.
 516          */
 517         drm_calc_timestamping_constants(crtc);
 518
 519         /* FIXME: add subpixel order */
 520 done:
 521         drm_mode_destroy(dev, adjusted_mode);
 522         if (!ret) {
 523                 crtc->hwmode = saved_hwmode;
 524                 crtc->mode = saved_mode;
 525                 crtc->x = saved_x;
 526                 crtc->y = saved_y;
 527         }
 528
 529         return ret;
 530 }
 531 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 532
 533
 534 static int
 535 drm_crtc_helper_disable(struct drm_crtc *crtc)
 536 {
 537         struct drm_device *dev = crtc->dev;
 538         struct drm_connector *connector;
 539         struct drm_encoder *encoder;
 540
 541         /* Decouple all encoders and their attached connectors from this crtc */
 542         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 543                 if (encoder->crtc != crtc)
 544                         continue;
 545
 546                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 547                         if (connector->encoder != encoder)
 548                                 continue;
 549
 550                         connector->encoder = NULL;
 551                 }
 552         }
 553
 554         drm_helper_disable_unused_functions(dev);
 555         return 0;
 556 }
 557
 558 /**
 559  * drm_crtc_helper_set_config - set a new config from userspace
 560  * @set: mode set configuration
 561  *
 562  * LOCKING:
 563  * Caller must hold mode config lock.
 564  *
 565  * Setup a new configuration, provided by the upper layers (either an ioctl call
 566  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 567  * enable it. This is the main helper functions for drivers that implement
 568  * kernel mode setting with the crtc helper functions and the assorted
 569  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 570  *
 571  * RETURNS:
 572  * Returns 0 on success, -ERRNO on failure.
 573  */
 574 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 575 {
 576         struct drm_device *dev;
 577         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 578         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 579         struct drm_framebuffer *old_fb = NULL;
 580         bool mode_changed = false; /* if true do a full mode set */
 581         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 582         struct drm_connector *save_connectors, *connector;
 583         int count = 0, ro, fail = 0;
 584         struct drm_crtc_helper_funcs *crtc_funcs;
 585         struct drm_mode_set save_set;
 586         int ret;
 587         int i;
 588
 589         DRM_DEBUG_KMS("\n");
 590
 591         if (!set)
 592                 return -EINVAL;
 593
 594         if (!set->crtc)
 595                 return -EINVAL;
 596
 597         if (!set->crtc->helper_private)
 598                 return -EINVAL;
 599
 600         crtc_funcs = set->crtc->helper_private;
 601
 602         if (!set->mode)
 603                 set->fb = NULL;
 604
 605         if (set->fb) {
 606                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 607                                 set->crtc->base.id, set->fb->base.id,
 608                                 (int)set->num_connectors, set->x, set->y);
 609         } else {
 610                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 611                 return drm_crtc_helper_disable(set->crtc);
 612         }
 613
 614         dev = set->crtc->dev;
 615
 616         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 617          * connector data. */
 618         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 619                              sizeof(struct drm_crtc), GFP_KERNEL);
 620         if (!save_crtcs)
 621                 return -ENOMEM;
 622
 623         save_encoders = kzalloc(dev->mode_config.num_encoder *
 624                                 sizeof(struct drm_encoder), GFP_KERNEL);
 625         if (!save_encoders) {
 626                 kfree(save_crtcs);
 627                 return -ENOMEM;
 628         }
 629
 630         save_connectors = kzalloc(dev->mode_config.num_connector *
 631                                 sizeof(struct drm_connector), GFP_KERNEL);
 632         if (!save_connectors) {
 633                 kfree(save_crtcs);
 634                 kfree(save_encoders);
 635                 return -ENOMEM;
 636         }
 637
 638         /* Copy data. Note that driver private data is not affected.
 639          * Should anything bad happen only the expected state is
 640          * restored, not the drivers personal bookkeeping.
 641          */
 642         count = 0;
 643         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 644                 save_crtcs[count++] = *crtc;
 645         }
 646
 647         count = 0;
 648         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 649                 save_encoders[count++] = *encoder;
 650         }
 651
 652         count = 0;
 653         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 654                 save_connectors[count++] = *connector;
 655         }
 656
 657         save_set.crtc = set->crtc;
 658         save_set.mode = &set->crtc->mode;
 659         save_set.x = set->crtc->x;
 660         save_set.y = set->crtc->y;
 661         save_set.fb = set->crtc->fb;
 662
 663         /* We should be able to check here if the fb has the same properties
 664          * and then just flip_or_move it */
 665         if (set->crtc->fb != set->fb) {
 666                 /* If we have no fb then treat it as a full mode set */
 667                 if (set->crtc->fb == NULL) {
 668                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 669                         mode_changed = true;
 670                 } else if (set->fb == NULL) {
 671                         mode_changed = true;
 672                 } else if (set->fb->depth != set->crtc->fb->depth) {
 673                         mode_changed = true;
 674                 } else if (set->fb->bits_per_pixel !=
 675                            set->crtc->fb->bits_per_pixel) {
 676                         mode_changed = true;
 677                 } else if (set->fb->pixel_format !=
 678                            set->crtc->fb->pixel_format) {
 679                         mode_changed = true;
 680                 } else
 681                         fb_changed = true;
 682         }
 683
 684         if (set->x != set->crtc->x || set->y != set->crtc->y)
 685                 fb_changed = true;
 686
 687         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 688                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 689                 drm_mode_debug_printmodeline(&set->crtc->mode);
 690                 drm_mode_debug_printmodeline(set->mode);
 691                 mode_changed = true;
 692         }
 693
 694         /* a) traverse passed in connector list and get encoders for them */
 695         count = 0;
 696         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 697                 struct drm_connector_helper_funcs *connector_funcs =
 698                         connector->helper_private;
 699                 new_encoder = connector->encoder;
 700                 for (ro = 0; ro < set->num_connectors; ro++) {
 701                         if (set->connectors[ro] == connector) {
 702                                 new_encoder = connector_funcs->best_encoder(connector);
 703                                 /* if we can't get an encoder for a connector
 704                                    we are setting now - then fail */
 705                                 if (new_encoder == NULL)
 706                                         /* don't break so fail path works correct */
 707                                         fail = 1;
 708                                 break;
 709                         }
 710                 }
 711
 712                 if (new_encoder != connector->encoder) {
 713                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 714                         mode_changed = true;
 715                         /* If the encoder is reused for another connector, then
 716                          * the appropriate crtc will be set later.
 717                          */
 718                         if (connector->encoder)
 719                                 connector->encoder->crtc = NULL;
 720                         connector->encoder = new_encoder;
 721                 }
 722         }
 723
 724         if (fail) {
 725                 ret = -EINVAL;
 726                 goto fail;
 727         }
 728
 729         count = 0;
 730         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 731                 if (!connector->encoder)
 732                         continue;
 733
 734                 if (connector->encoder->crtc == set->crtc)
 735                         new_crtc = NULL;
 736                 else
 737                         new_crtc = connector->encoder->crtc;
 738
 739                 for (ro = 0; ro < set->num_connectors; ro++) {
 740                         if (set->connectors[ro] == connector)
 741                                 new_crtc = set->crtc;
 742                 }
 743
 744                 /* Make sure the new CRTC will work with the encoder */
 745                 if (new_crtc &&
 746                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 747                         ret = -EINVAL;
 748                         goto fail;
 749                 }
 750                 if (new_crtc != connector->encoder->crtc) {
 751                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 752                         mode_changed = true;
 753                         connector->encoder->crtc = new_crtc;
 754                 }
 755                 if (new_crtc) {
 756                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 757                                 connector->base.id, drm_get_connector_name(connector),
 758                                 new_crtc->base.id);
 759                 } else {
 760                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 761                                 connector->base.id, drm_get_connector_name(connector));
 762                 }
 763         }
 764
 765         /* mode_set_base is not a required function */
 766         if (fb_changed && !crtc_funcs->mode_set_base)
 767                 mode_changed = true;
 768
 769         if (mode_changed) {
 770                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 771                 if (set->crtc->enabled) {
 772                         DRM_DEBUG_KMS("attempting to set mode from"
 773                                         " userspace\n");
 774                         drm_mode_debug_printmodeline(set->mode);
 775                         old_fb = set->crtc->fb;
 776                         set->crtc->fb = set->fb;
 777                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 778                                                       set->x, set->y,
 779                                                       old_fb)) {
 780                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 781                                           set->crtc->base.id);
 782                                 set->crtc->fb = old_fb;
 783                                 ret = -EINVAL;
 784                                 goto fail;
 785                         }
 786                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 787                         for (i = 0; i < set->num_connectors; i++) {
 788                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 789                                               drm_get_connector_name(set->connectors[i]));
 790                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 791                         }
 792                 }
 793                 drm_helper_disable_unused_functions(dev);
 794         } else if (fb_changed) {
 795                 set->crtc->x = set->x;
 796                 set->crtc->y = set->y;
 797
 798                 old_fb = set->crtc->fb;
 799                 if (set->crtc->fb != set->fb)
 800                         set->crtc->fb = set->fb;
 801                 ret = crtc_funcs->mode_set_base(set->crtc,
 802                                                 set->x, set->y, old_fb);
 803                 if (ret != 0) {
 804                         set->crtc->fb = old_fb;
 805                         goto fail;
 806                 }
 807         }
 808
 809         kfree(save_connectors);
 810         kfree(save_encoders);
 811         kfree(save_crtcs);
 812         return 0;
 813
 814 fail:
 815         /* Restore all previous data. */
 816         count = 0;
 817         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 818                 *crtc = save_crtcs[count++];
 819         }
 820
 821         count = 0;
 822         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 823                 *encoder = save_encoders[count++];
 824         }
 825
 826         count = 0;
 827         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 828                 *connector = save_connectors[count++];
 829         }
 830
 831         /* Try to restore the config */
 832         if (mode_changed &&
 833             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 834                                       save_set.y, save_set.fb))
 835                 DRM_ERROR("failed to restore config after modeset failure\n");
 836
 837         kfree(save_connectors);
 838         kfree(save_encoders);
 839         kfree(save_crtcs);
 840         return ret;
 841 }
 842 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 843
 844 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 845 {
 846         int dpms = DRM_MODE_DPMS_OFF;
 847         struct drm_connector *connector;
 848         struct drm_device *dev = encoder->dev;
 849
 850         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 851                 if (connector->encoder == encoder)
 852                         if (connector->dpms < dpms)
 853                                 dpms = connector->dpms;
 854         return dpms;
 855 }
 856
 857 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 858 {
 859         int dpms = DRM_MODE_DPMS_OFF;
 860         struct drm_connector *connector;
 861         struct drm_device *dev = crtc->dev;
 862
 863         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 864                 if (connector->encoder && connector->encoder->crtc == crtc)
 865                         if (connector->dpms < dpms)
 866                                 dpms = connector->dpms;
 867         return dpms;
 868 }
 869
 870 /**
 871  * drm_helper_connector_dpms() - connector dpms helper implementation
 872  * @connector: affected connector
 873  * @mode: DPMS mode
 874  *
 875  * This is the main helper function provided by the crtc helper framework for
 876  * implementing the DPMS connector attribute. It computes the new desired DPMS
 877  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 878  * callback provided by the driver appropriately.
 879  */
 880 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 881 {
 882         struct drm_encoder *encoder = connector->encoder;
 883         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 884         int old_dpms;
 885
 886         if (mode == connector->dpms)
 887                 return;
 888
 889         old_dpms = connector->dpms;
 890         connector->dpms = mode;
 891
 892         /* from off to on, do crtc then encoder */
 893         if (mode < old_dpms) {
 894                 if (crtc) {
 895                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 896                         if (crtc_funcs->dpms)
 897                                 (*crtc_funcs->dpms) (crtc,
 898                                                      drm_helper_choose_crtc_dpms(crtc));
 899                 }
 900                 if (encoder) {
 901                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 902                         if (encoder_funcs->dpms)
 903                                 (*encoder_funcs->dpms) (encoder,
 904                                                         drm_helper_choose_encoder_dpms(encoder));
 905                 }
 906         }
 907
 908         /* from on to off, do encoder then crtc */
 909         if (mode > old_dpms) {
 910                 if (encoder) {
 911                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 912                         if (encoder_funcs->dpms)
 913                                 (*encoder_funcs->dpms) (encoder,
 914                                                         drm_helper_choose_encoder_dpms(encoder));
 915                 }
 916                 if (crtc) {
 917                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 918                         if (crtc_funcs->dpms)
 919                                 (*crtc_funcs->dpms) (crtc,
 920                                                      drm_helper_choose_crtc_dpms(crtc));
 921                 }
 922         }
 923
 924         return;
 925 }
 926 EXPORT_SYMBOL(drm_helper_connector_dpms);
 927
 928 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 929                                    struct drm_mode_fb_cmd2 *mode_cmd)
 930 {
 931         int i;
 932
 933         fb->width = mode_cmd->width;
 934         fb->height = mode_cmd->height;
 935         for (i = 0; i < 4; i++) {
 936                 fb->pitches[i] = mode_cmd->pitches[i];
 937                 fb->offsets[i] = mode_cmd->offsets[i];
 938         }
 939         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 940                                     &fb->bits_per_pixel);
 941         fb->pixel_format = mode_cmd->pixel_format;
 942
 943         return 0;
 944 }
 945 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 946
 947 int drm_helper_resume_force_mode(struct drm_device *dev)
 948 {
 949         struct drm_crtc *crtc;
 950         struct drm_encoder *encoder;
 951         struct drm_encoder_helper_funcs *encoder_funcs;
 952         struct drm_crtc_helper_funcs *crtc_funcs;
 953         int ret;
 954
 955         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 956
 957                 if (!crtc->enabled)
 958                         continue;
 959
 960                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 961                                                crtc->x, crtc->y, crtc->fb);
 962
 963                 if (ret == false)
 964                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 965
 966                 /* Turn off outputs that were already powered off */
 967                 if (drm_helper_choose_crtc_dpms(crtc)) {
 968                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 969
 970                                 if(encoder->crtc != crtc)
 971                                         continue;
 972
 973                                 encoder_funcs = encoder->helper_private;
 974                                 if (encoder_funcs->dpms)
 975                                         (*encoder_funcs->dpms) (encoder,
 976                                                                 drm_helper_choose_encoder_dpms(encoder));
 977                         }
 978
 979                         crtc_funcs = crtc->helper_private;
 980                         if (crtc_funcs->dpms)
 981                                 (*crtc_funcs->dpms) (crtc,
 982                                                      drm_helper_choose_crtc_dpms(crtc));
 983                 }
 984         }
 985         /* disable the unused connectors while restoring the modesetting */
 986         drm_helper_disable_unused_functions(dev);
 987         return 0;
 988 }
 989 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 990
 991 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 992 {
 993         /* send a uevent + call fbdev */
 994 #if 0
 995         drm_sysfs_hotplug_event(dev);
 996 #endif
 997         if (dev->mode_config.funcs->output_poll_changed)
 998                 dev->mode_config.funcs->output_poll_changed(dev);
 999 }
1000 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1001
1002 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1003 static void output_poll_execute(struct work_struct *work)
1004 {
1005         struct delayed_work *delayed_work = to_delayed_work(work);
1006         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1007         struct drm_connector *connector;
1008         enum drm_connector_status old_status;
1009         bool repoll = false, changed = false;
1010
1011         if (!drm_kms_helper_poll)
1012                 return;
1013
1014         mutex_lock(&dev->mode_config.mutex);
1015         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1016
1017                 /* Ignore forced connectors. */
1018                 if (connector->force)
1019                         continue;
1020
1021                 /* Ignore HPD capable connectors and connectors where we don't
1022                  * want any hotplug detection at all for polling. */
1023                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1024                         continue;
1025
1026                 repoll = true;
1027
1028                 old_status = connector->status;
1029                 /* if we are connected and don't want to poll for disconnect
1030                    skip it */
1031                 if (old_status == connector_status_connected &&
1032                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1033                         continue;
1034
1035                 connector->status = connector->funcs->detect(connector, false);
1036                 if (old_status != connector->status) {
1037                         const char *old, *new;
1038
1039                         old = drm_get_connector_status_name(old_status);
1040                         new = drm_get_connector_status_name(connector->status);
1041
1042                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1043                                       "status updated from %s to %s\n",
1044                                       connector->base.id,
1045                                       drm_get_connector_name(connector),
1046                                       old, new);
1047
1048                         changed = true;
1049                 }
1050         }
1051
1052         mutex_unlock(&dev->mode_config.mutex);
1053
1054         if (changed)
1055                 drm_kms_helper_hotplug_event(dev);
1056
1057         if (repoll)
1058                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1059 }
1060
1061 void drm_kms_helper_poll_disable(struct drm_device *dev)
1062 {
1063         if (!dev->mode_config.poll_enabled)
1064                 return;
1065         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1066 }
1067 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1068
1069 void drm_kms_helper_poll_enable(struct drm_device *dev)
1070 {
1071         bool poll = false;
1072         struct drm_connector *connector;
1073
1074         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1075                 return;
1076
1077         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1078                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1079                                          DRM_CONNECTOR_POLL_DISCONNECT))
1080                         poll = true;
1081         }
1082
1083         if (poll)
1084                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1085 }
1086 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1087
1088 void drm_kms_helper_poll_init(struct drm_device *dev)
1089 {
1090         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1091         dev->mode_config.poll_enabled = true;
1092
1093         drm_kms_helper_poll_enable(dev);
1094 }
1095 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1096
1097 void drm_kms_helper_poll_fini(struct drm_device *dev)
1098 {
1099         drm_kms_helper_poll_disable(dev);
1100 }
1101 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1102
1103 void drm_helper_hpd_irq_event(struct drm_device *dev)
1104 {
1105         struct drm_connector *connector;
1106         enum drm_connector_status old_status;
1107         bool changed = false;
1108
1109         if (!dev->mode_config.poll_enabled)
1110                 return;
1111
1112         mutex_lock(&dev->mode_config.mutex);
1113         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1114
1115                 /* Only handle HPD capable connectors. */
1116                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1117                         continue;
1118
1119                 old_status = connector->status;
1120
1121                 connector->status = connector->funcs->detect(connector, false);
1122                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1123                               connector->base.id,
1124                               drm_get_connector_name(connector),
1125                               drm_get_connector_status_name(old_status),
1126                               drm_get_connector_status_name(connector->status));
1127                 if (old_status != connector->status)
1128                         changed = true;
1129         }
1130
1131         mutex_unlock(&dev->mode_config.mutex);
1132
1133         if (changed)
1134                 drm_kms_helper_hotplug_event(dev);
1135 }
1136 EXPORT_SYMBOL(drm_helper_hpd_irq_event);