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                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 285 }
 286
 287 /**
 288  * drm_helper_disable_unused_functions - disable unused objects
 289  * @dev: DRM device
 290  *
 291  * LOCKING:
 292  * Caller must hold mode config lock.
 293  *
 294  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 295  * by calling its dpms function, which should power it off.
 296  */
 297 void drm_helper_disable_unused_functions(struct drm_device *dev)
 298 {
 299         struct drm_encoder *encoder;
 300         struct drm_connector *connector;
 301         struct drm_crtc *crtc;
 302
 303         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 304                 if (!connector->encoder)
 305                         continue;
 306                 if (connector->status == connector_status_disconnected)
 307                         connector->encoder = NULL;
 308         }
 309
 310         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 311                 if (!drm_helper_encoder_in_use(encoder)) {
 312                         drm_encoder_disable(encoder);
 313                         /* disconnector encoder from any connector */
 314                         encoder->crtc = NULL;
 315                 }
 316         }
 317
 318         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 319                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 320                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 321                 if (!crtc->enabled) {
 322                         if (crtc_funcs->disable)
 323                                 (*crtc_funcs->disable)(crtc);
 324                         else
 325                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 326                         crtc->fb = NULL;
 327                 }
 328         }
 329 }
 330 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 331
 332 /**
 333  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 334  * @encoder: encoder to test
 335  * @crtc: crtc to test
 336  *
 337  * Return false if @encoder can't be driven by @crtc, true otherwise.
 338  */
 339 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 340                                 struct drm_crtc *crtc)
 341 {
 342         struct drm_device *dev;
 343         struct drm_crtc *tmp;
 344         int crtc_mask = 1;
 345
 346         WARN(!crtc, "checking null crtc?\n");
 347
 348         dev = crtc->dev;
 349
 350         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 351                 if (tmp == crtc)
 352                         break;
 353                 crtc_mask <<= 1;
 354         }
 355
 356         if (encoder->possible_crtcs & crtc_mask)
 357                 return true;
 358         return false;
 359 }
 360
 361 /*
 362  * Check the CRTC we're going to map each output to vs. its current
 363  * CRTC.  If they don't match, we have to disable the output and the CRTC
 364  * since the driver will have to re-route things.
 365  */
 366 static void
 367 drm_crtc_prepare_encoders(struct drm_device *dev)
 368 {
 369         struct drm_encoder_helper_funcs *encoder_funcs;
 370         struct drm_encoder *encoder;
 371
 372         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 373                 encoder_funcs = encoder->helper_private;
 374                 /* Disable unused encoders */
 375                 if (encoder->crtc == NULL)
 376                         drm_encoder_disable(encoder);
 377                 /* Disable encoders whose CRTC is about to change */
 378                 if (encoder_funcs->get_crtc &&
 379                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 380                         drm_encoder_disable(encoder);
 381         }
 382 }
 383
 384 /**
 385  * drm_crtc_helper_set_mode - internal helper to set a mode
 386  * @crtc: CRTC to program
 387  * @mode: mode to use
 388  * @x: horizontal offset into the surface
 389  * @y: vertical offset into the surface
 390  * @old_fb: old framebuffer, for cleanup
 391  *
 392  * LOCKING:
 393  * Caller must hold mode config lock.
 394  *
 395  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 396  * to fixup or reject the mode prior to trying to set it. This is an internal
 397  * helper that drivers could e.g. use to update properties that require the
 398  * entire output pipe to be disabled and re-enabled in a new configuration. For
 399  * example for changing whether audio is enabled on a hdmi link or for changing
 400  * panel fitter or dither attributes. It is also called by the
 401  * drm_crtc_helper_set_config() helper function to drive the mode setting
 402  * sequence.
 403  *
 404  * RETURNS:
 405  * True if the mode was set successfully, or false otherwise.
 406  */
 407 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 408                               struct drm_display_mode *mode,
 409                               int x, int y,
 410                               struct drm_framebuffer *old_fb)
 411 {
 412         struct drm_device *dev = crtc->dev;
 413         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 414         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 415         struct drm_encoder_helper_funcs *encoder_funcs;
 416         int saved_x, saved_y;
 417         struct drm_encoder *encoder;
 418         bool ret = true;
 419
 420         crtc->enabled = drm_helper_crtc_in_use(crtc);
 421         if (!crtc->enabled)
 422                 return true;
 423
 424         adjusted_mode = drm_mode_duplicate(dev, mode);
 425         if (!adjusted_mode)
 426                 return false;
 427
 428         saved_hwmode = crtc->hwmode;
 429         saved_mode = crtc->mode;
 430         saved_x = crtc->x;
 431         saved_y = crtc->y;
 432
 433         /* Update crtc values up front so the driver can rely on them for mode
 434          * setting.
 435          */
 436         crtc->mode = *mode;
 437         crtc->x = x;
 438         crtc->y = y;
 439
 440         /* Pass our mode to the connectors and the CRTC to give them a chance to
 441          * adjust it according to limitations or connector properties, and also
 442          * a chance to reject the mode entirely.
 443          */
 444         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 445
 446                 if (encoder->crtc != crtc)
 447                         continue;
 448                 encoder_funcs = encoder->helper_private;
 449                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 450                                                       adjusted_mode))) {
 451                         DRM_DEBUG_KMS("Encoder fixup failed\n");
 452                         goto done;
 453                 }
 454         }
 455
 456         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 457                 DRM_DEBUG_KMS("CRTC fixup failed\n");
 458                 goto done;
 459         }
 460         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 461
 462         /* Prepare the encoders and CRTCs before setting the mode. */
 463         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 464
 465                 if (encoder->crtc != crtc)
 466                         continue;
 467                 encoder_funcs = encoder->helper_private;
 468                 /* Disable the encoders as the first thing we do. */
 469                 encoder_funcs->prepare(encoder);
 470         }
 471
 472         drm_crtc_prepare_encoders(dev);
 473
 474         crtc_funcs->prepare(crtc);
 475
 476         /* Set up the DPLL and any encoders state that needs to adjust or depend
 477          * on the DPLL.
 478          */
 479         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 480         if (!ret)
 481             goto done;
 482
 483         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 484
 485                 if (encoder->crtc != crtc)
 486                         continue;
 487
 488                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 489                         encoder->base.id, drm_get_encoder_name(encoder),
 490                         mode->base.id, mode->name);
 491                 encoder_funcs = encoder->helper_private;
 492                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 493         }
 494
 495         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 496         crtc_funcs->commit(crtc);
 497
 498         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 499
 500                 if (encoder->crtc != crtc)
 501                         continue;
 502
 503                 encoder_funcs = encoder->helper_private;
 504                 encoder_funcs->commit(encoder);
 505
 506         }
 507
 508         /* Store real post-adjustment hardware mode. */
 509         crtc->hwmode = *adjusted_mode;
 510
 511         /* Calculate and store various constants which
 512          * are later needed by vblank and swap-completion
 513          * timestamping. They are derived from true hwmode.
 514          */
 515         drm_calc_timestamping_constants(crtc);
 516
 517         /* FIXME: add subpixel order */
 518 done:
 519         drm_mode_destroy(dev, adjusted_mode);
 520         if (!ret) {
 521                 crtc->hwmode = saved_hwmode;
 522                 crtc->mode = saved_mode;
 523                 crtc->x = saved_x;
 524                 crtc->y = saved_y;
 525         }
 526
 527         return ret;
 528 }
 529 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
 530
 531
 532 static int
 533 drm_crtc_helper_disable(struct drm_crtc *crtc)
 534 {
 535         struct drm_device *dev = crtc->dev;
 536         struct drm_connector *connector;
 537         struct drm_encoder *encoder;
 538
 539         /* Decouple all encoders and their attached connectors from this crtc */
 540         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 541                 if (encoder->crtc != crtc)
 542                         continue;
 543
 544                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 545                         if (connector->encoder != encoder)
 546                                 continue;
 547
 548                         connector->encoder = NULL;
 549                 }
 550         }
 551
 552         drm_helper_disable_unused_functions(dev);
 553         return 0;
 554 }
 555
 556 /**
 557  * drm_crtc_helper_set_config - set a new config from userspace
 558  * @set: mode set configuration
 559  *
 560  * LOCKING:
 561  * Caller must hold mode config lock.
 562  *
 563  * Setup a new configuration, provided by the upper layers (either an ioctl call
 564  * from userspace or internally e.g. from the fbdev suppport code) in @set, and
 565  * enable it. This is the main helper functions for drivers that implement
 566  * kernel mode setting with the crtc helper functions and the assorted
 567  * ->prepare(), ->modeset() and ->commit() helper callbacks.
 568  *
 569  * RETURNS:
 570  * Returns 0 on success, -ERRNO on failure.
 571  */
 572 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 573 {
 574         struct drm_device *dev;
 575         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 576         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 577         struct drm_framebuffer *old_fb = NULL;
 578         bool mode_changed = false; /* if true do a full mode set */
 579         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 580         struct drm_connector *save_connectors, *connector;
 581         int count = 0, ro, fail = 0;
 582         struct drm_crtc_helper_funcs *crtc_funcs;
 583         struct drm_mode_set save_set;
 584         int ret;
 585         int i;
 586
 587         DRM_DEBUG_KMS("\n");
 588
 589         if (!set)
 590                 return -EINVAL;
 591
 592         if (!set->crtc)
 593                 return -EINVAL;
 594
 595         if (!set->crtc->helper_private)
 596                 return -EINVAL;
 597
 598         crtc_funcs = set->crtc->helper_private;
 599
 600         if (!set->mode)
 601                 set->fb = NULL;
 602
 603         if (set->fb) {
 604                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 605                                 set->crtc->base.id, set->fb->base.id,
 606                                 (int)set->num_connectors, set->x, set->y);
 607         } else {
 608                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 609                 return drm_crtc_helper_disable(set->crtc);
 610         }
 611
 612         dev = set->crtc->dev;
 613
 614         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 615          * connector data. */
 616         save_crtcs = kzalloc(dev->mode_config.num_crtc *
 617                              sizeof(struct drm_crtc), GFP_KERNEL);
 618         if (!save_crtcs)
 619                 return -ENOMEM;
 620
 621         save_encoders = kzalloc(dev->mode_config.num_encoder *
 622                                 sizeof(struct drm_encoder), GFP_KERNEL);
 623         if (!save_encoders) {
 624                 kfree(save_crtcs);
 625                 return -ENOMEM;
 626         }
 627
 628         save_connectors = kzalloc(dev->mode_config.num_connector *
 629                                 sizeof(struct drm_connector), GFP_KERNEL);
 630         if (!save_connectors) {
 631                 kfree(save_crtcs);
 632                 kfree(save_encoders);
 633                 return -ENOMEM;
 634         }
 635
 636         /* Copy data. Note that driver private data is not affected.
 637          * Should anything bad happen only the expected state is
 638          * restored, not the drivers personal bookkeeping.
 639          */
 640         count = 0;
 641         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 642                 save_crtcs[count++] = *crtc;
 643         }
 644
 645         count = 0;
 646         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 647                 save_encoders[count++] = *encoder;
 648         }
 649
 650         count = 0;
 651         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 652                 save_connectors[count++] = *connector;
 653         }
 654
 655         save_set.crtc = set->crtc;
 656         save_set.mode = &set->crtc->mode;
 657         save_set.x = set->crtc->x;
 658         save_set.y = set->crtc->y;
 659         save_set.fb = set->crtc->fb;
 660
 661         /* We should be able to check here if the fb has the same properties
 662          * and then just flip_or_move it */
 663         if (set->crtc->fb != set->fb) {
 664                 /* If we have no fb then treat it as a full mode set */
 665                 if (set->crtc->fb == NULL) {
 666                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 667                         mode_changed = true;
 668                 } else if (set->fb == NULL) {
 669                         mode_changed = true;
 670                 } else if (set->fb->depth != set->crtc->fb->depth) {
 671                         mode_changed = true;
 672                 } else if (set->fb->bits_per_pixel !=
 673                            set->crtc->fb->bits_per_pixel) {
 674                         mode_changed = true;
 675                 } else if (set->fb->pixel_format !=
 676                            set->crtc->fb->pixel_format) {
 677                         mode_changed = true;
 678                 } else
 679                         fb_changed = true;
 680         }
 681
 682         if (set->x != set->crtc->x || set->y != set->crtc->y)
 683                 fb_changed = true;
 684
 685         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 686                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 687                 drm_mode_debug_printmodeline(&set->crtc->mode);
 688                 drm_mode_debug_printmodeline(set->mode);
 689                 mode_changed = true;
 690         }
 691
 692         /* a) traverse passed in connector list and get encoders for them */
 693         count = 0;
 694         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 695                 struct drm_connector_helper_funcs *connector_funcs =
 696                         connector->helper_private;
 697                 new_encoder = connector->encoder;
 698                 for (ro = 0; ro < set->num_connectors; ro++) {
 699                         if (set->connectors[ro] == connector) {
 700                                 new_encoder = connector_funcs->best_encoder(connector);
 701                                 /* if we can't get an encoder for a connector
 702                                    we are setting now - then fail */
 703                                 if (new_encoder == NULL)
 704                                         /* don't break so fail path works correct */
 705                                         fail = 1;
 706                                 break;
 707                         }
 708                 }
 709
 710                 if (new_encoder != connector->encoder) {
 711                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 712                         mode_changed = true;
 713                         /* If the encoder is reused for another connector, then
 714                          * the appropriate crtc will be set later.
 715                          */
 716                         if (connector->encoder)
 717                                 connector->encoder->crtc = NULL;
 718                         connector->encoder = new_encoder;
 719                 }
 720         }
 721
 722         if (fail) {
 723                 ret = -EINVAL;
 724                 goto fail;
 725         }
 726
 727         count = 0;
 728         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 729                 if (!connector->encoder)
 730                         continue;
 731
 732                 if (connector->encoder->crtc == set->crtc)
 733                         new_crtc = NULL;
 734                 else
 735                         new_crtc = connector->encoder->crtc;
 736
 737                 for (ro = 0; ro < set->num_connectors; ro++) {
 738                         if (set->connectors[ro] == connector)
 739                                 new_crtc = set->crtc;
 740                 }
 741
 742                 /* Make sure the new CRTC will work with the encoder */
 743                 if (new_crtc &&
 744                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 745                         ret = -EINVAL;
 746                         goto fail;
 747                 }
 748                 if (new_crtc != connector->encoder->crtc) {
 749                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 750                         mode_changed = true;
 751                         connector->encoder->crtc = new_crtc;
 752                 }
 753                 if (new_crtc) {
 754                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 755                                 connector->base.id, drm_get_connector_name(connector),
 756                                 new_crtc->base.id);
 757                 } else {
 758                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 759                                 connector->base.id, drm_get_connector_name(connector));
 760                 }
 761         }
 762
 763         /* mode_set_base is not a required function */
 764         if (fb_changed && !crtc_funcs->mode_set_base)
 765                 mode_changed = true;
 766
 767         if (mode_changed) {
 768                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 769                 if (set->crtc->enabled) {
 770                         DRM_DEBUG_KMS("attempting to set mode from"
 771                                         " userspace\n");
 772                         drm_mode_debug_printmodeline(set->mode);
 773                         old_fb = set->crtc->fb;
 774                         set->crtc->fb = set->fb;
 775                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 776                                                       set->x, set->y,
 777                                                       old_fb)) {
 778                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 779                                           set->crtc->base.id);
 780                                 set->crtc->fb = old_fb;
 781                                 ret = -EINVAL;
 782                                 goto fail;
 783                         }
 784                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 785                         for (i = 0; i < set->num_connectors; i++) {
 786                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 787                                               drm_get_connector_name(set->connectors[i]));
 788                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
 789                         }
 790                 }
 791                 drm_helper_disable_unused_functions(dev);
 792         } else if (fb_changed) {
 793                 set->crtc->x = set->x;
 794                 set->crtc->y = set->y;
 795
 796                 old_fb = set->crtc->fb;
 797                 if (set->crtc->fb != set->fb)
 798                         set->crtc->fb = set->fb;
 799                 ret = crtc_funcs->mode_set_base(set->crtc,
 800                                                 set->x, set->y, old_fb);
 801                 if (ret != 0) {
 802                         set->crtc->fb = old_fb;
 803                         goto fail;
 804                 }
 805         }
 806
 807         kfree(save_connectors);
 808         kfree(save_encoders);
 809         kfree(save_crtcs);
 810         return 0;
 811
 812 fail:
 813         /* Restore all previous data. */
 814         count = 0;
 815         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 816                 *crtc = save_crtcs[count++];
 817         }
 818
 819         count = 0;
 820         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 821                 *encoder = save_encoders[count++];
 822         }
 823
 824         count = 0;
 825         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 826                 *connector = save_connectors[count++];
 827         }
 828
 829         /* Try to restore the config */
 830         if (mode_changed &&
 831             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 832                                       save_set.y, save_set.fb))
 833                 DRM_ERROR("failed to restore config after modeset failure\n");
 834
 835         kfree(save_connectors);
 836         kfree(save_encoders);
 837         kfree(save_crtcs);
 838         return ret;
 839 }
 840 EXPORT_SYMBOL(drm_crtc_helper_set_config);
 841
 842 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 843 {
 844         int dpms = DRM_MODE_DPMS_OFF;
 845         struct drm_connector *connector;
 846         struct drm_device *dev = encoder->dev;
 847
 848         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 849                 if (connector->encoder == encoder)
 850                         if (connector->dpms < dpms)
 851                                 dpms = connector->dpms;
 852         return dpms;
 853 }
 854
 855 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 856 {
 857         int dpms = DRM_MODE_DPMS_OFF;
 858         struct drm_connector *connector;
 859         struct drm_device *dev = crtc->dev;
 860
 861         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 862                 if (connector->encoder && connector->encoder->crtc == crtc)
 863                         if (connector->dpms < dpms)
 864                                 dpms = connector->dpms;
 865         return dpms;
 866 }
 867
 868 /**
 869  * drm_helper_connector_dpms() - connector dpms helper implementation
 870  * @connector: affected connector
 871  * @mode: DPMS mode
 872  *
 873  * This is the main helper function provided by the crtc helper framework for
 874  * implementing the DPMS connector attribute. It computes the new desired DPMS
 875  * state for all encoders and crtcs in the output mesh and calls the ->dpms()
 876  * callback provided by the driver appropriately.
 877  */
 878 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 879 {
 880         struct drm_encoder *encoder = connector->encoder;
 881         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 882         int old_dpms;
 883
 884         if (mode == connector->dpms)
 885                 return;
 886
 887         old_dpms = connector->dpms;
 888         connector->dpms = mode;
 889
 890         /* from off to on, do crtc then encoder */
 891         if (mode < old_dpms) {
 892                 if (crtc) {
 893                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 894                         if (crtc_funcs->dpms)
 895                                 (*crtc_funcs->dpms) (crtc,
 896                                                      drm_helper_choose_crtc_dpms(crtc));
 897                 }
 898                 if (encoder) {
 899                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 900                         if (encoder_funcs->dpms)
 901                                 (*encoder_funcs->dpms) (encoder,
 902                                                         drm_helper_choose_encoder_dpms(encoder));
 903                 }
 904         }
 905
 906         /* from on to off, do encoder then crtc */
 907         if (mode > old_dpms) {
 908                 if (encoder) {
 909                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 910                         if (encoder_funcs->dpms)
 911                                 (*encoder_funcs->dpms) (encoder,
 912                                                         drm_helper_choose_encoder_dpms(encoder));
 913                 }
 914                 if (crtc) {
 915                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 916                         if (crtc_funcs->dpms)
 917                                 (*crtc_funcs->dpms) (crtc,
 918                                                      drm_helper_choose_crtc_dpms(crtc));
 919                 }
 920         }
 921
 922         return;
 923 }
 924 EXPORT_SYMBOL(drm_helper_connector_dpms);
 925
 926 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 927                                    struct drm_mode_fb_cmd2 *mode_cmd)
 928 {
 929         int i;
 930
 931         fb->width = mode_cmd->width;
 932         fb->height = mode_cmd->height;
 933         for (i = 0; i < 4; i++) {
 934                 fb->pitches[i] = mode_cmd->pitches[i];
 935                 fb->offsets[i] = mode_cmd->offsets[i];
 936         }
 937         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 938                                     &fb->bits_per_pixel);
 939         fb->pixel_format = mode_cmd->pixel_format;
 940
 941         return 0;
 942 }
 943 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
 944
 945 int drm_helper_resume_force_mode(struct drm_device *dev)
 946 {
 947         struct drm_crtc *crtc;
 948         struct drm_encoder *encoder;
 949         struct drm_encoder_helper_funcs *encoder_funcs;
 950         struct drm_crtc_helper_funcs *crtc_funcs;
 951         int ret;
 952
 953         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 954
 955                 if (!crtc->enabled)
 956                         continue;
 957
 958                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 959                                                crtc->x, crtc->y, crtc->fb);
 960
 961                 if (ret == false)
 962                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 963
 964                 /* Turn off outputs that were already powered off */
 965                 if (drm_helper_choose_crtc_dpms(crtc)) {
 966                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 967
 968                                 if(encoder->crtc != crtc)
 969                                         continue;
 970
 971                                 encoder_funcs = encoder->helper_private;
 972                                 if (encoder_funcs->dpms)
 973                                         (*encoder_funcs->dpms) (encoder,
 974                                                                 drm_helper_choose_encoder_dpms(encoder));
 975                         }
 976
 977                         crtc_funcs = crtc->helper_private;
 978                         if (crtc_funcs->dpms)
 979                                 (*crtc_funcs->dpms) (crtc,
 980                                                      drm_helper_choose_crtc_dpms(crtc));
 981                 }
 982         }
 983         /* disable the unused connectors while restoring the modesetting */
 984         drm_helper_disable_unused_functions(dev);
 985         return 0;
 986 }
 987 EXPORT_SYMBOL(drm_helper_resume_force_mode);
 988
 989 void drm_kms_helper_hotplug_event(struct drm_device *dev)
 990 {
 991         /* send a uevent + call fbdev */
 992 #if 0
 993         drm_sysfs_hotplug_event(dev);
 994 #endif
 995         if (dev->mode_config.funcs->output_poll_changed)
 996                 dev->mode_config.funcs->output_poll_changed(dev);
 997 }
 998 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
 999
1000 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1001 static void output_poll_execute(struct work_struct *work)
1002 {
1003         struct delayed_work *delayed_work = to_delayed_work(work);
1004         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1005         struct drm_connector *connector;
1006         enum drm_connector_status old_status;
1007         bool repoll = false, changed = false;
1008
1009         if (!drm_kms_helper_poll)
1010                 return;
1011
1012         mutex_lock(&dev->mode_config.mutex);
1013         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1014
1015                 /* Ignore forced connectors. */
1016                 if (connector->force)
1017                         continue;
1018
1019                 /* Ignore HPD capable connectors and connectors where we don't
1020                  * want any hotplug detection at all for polling. */
1021                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1022                         continue;
1023
1024                 repoll = true;
1025
1026                 old_status = connector->status;
1027                 /* if we are connected and don't want to poll for disconnect
1028                    skip it */
1029                 if (old_status == connector_status_connected &&
1030                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1031                         continue;
1032
1033                 connector->status = connector->funcs->detect(connector, false);
1034                 if (old_status != connector->status) {
1035                         const char *old, *new;
1036
1037                         old = drm_get_connector_status_name(old_status);
1038                         new = drm_get_connector_status_name(connector->status);
1039
1040                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1041                                       "status updated from %s to %s\n",
1042                                       connector->base.id,
1043                                       drm_get_connector_name(connector),
1044                                       old, new);
1045
1046                         changed = true;
1047                 }
1048         }
1049
1050         mutex_unlock(&dev->mode_config.mutex);
1051
1052         if (changed)
1053                 drm_kms_helper_hotplug_event(dev);
1054
1055         if (repoll)
1056                 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1057 }
1058
1059 void drm_kms_helper_poll_disable(struct drm_device *dev)
1060 {
1061         if (!dev->mode_config.poll_enabled)
1062                 return;
1063         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1064 }
1065 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1066
1067 void drm_kms_helper_poll_enable(struct drm_device *dev)
1068 {
1069         bool poll = false;
1070         struct drm_connector *connector;
1071
1072         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1073                 return;
1074
1075         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1076                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1077                                          DRM_CONNECTOR_POLL_DISCONNECT))
1078                         poll = true;
1079         }
1080
1081         if (poll)
1082                 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1083 }
1084 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1085
1086 void drm_kms_helper_poll_init(struct drm_device *dev)
1087 {
1088         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1089         dev->mode_config.poll_enabled = true;
1090
1091         drm_kms_helper_poll_enable(dev);
1092 }
1093 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1094
1095 void drm_kms_helper_poll_fini(struct drm_device *dev)
1096 {
1097         drm_kms_helper_poll_disable(dev);
1098 }
1099 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1100
1101 void drm_helper_hpd_irq_event(struct drm_device *dev)
1102 {
1103         struct drm_connector *connector;
1104         enum drm_connector_status old_status;
1105         bool changed = false;
1106
1107         if (!dev->mode_config.poll_enabled)
1108                 return;
1109
1110         mutex_lock(&dev->mode_config.mutex);
1111         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1112
1113                 /* Only handle HPD capable connectors. */
1114                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1115                         continue;
1116
1117                 old_status = connector->status;
1118
1119                 connector->status = connector->funcs->detect(connector, false);
1120                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1121                               connector->base.id,
1122                               drm_get_connector_name(connector),
1123                               drm_get_connector_status_name(old_status),
1124                               drm_get_connector_status_name(connector->status));
1125                 if (old_status != connector->status)
1126                         changed = true;
1127         }
1128
1129         mutex_unlock(&dev->mode_config.mutex);
1130
1131         if (changed)
1132                 drm_kms_helper_hotplug_event(dev);
1133 }
1134 EXPORT_SYMBOL(drm_helper_hpd_irq_event);