sys/dev/drm2/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <dev/drm2/drmP.h>
  37 #include <dev/drm2/drm_crtc.h>
  38 #include <dev/drm2/drm_fb_helper.h>
  39 #include <dev/drm2/drm_crtc_helper.h>
  40
  41 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  42 MODULE_DESCRIPTION("DRM KMS helper");
  43 MODULE_LICENSE("GPL and additional rights");
  44
  45 static DRM_LIST_HEAD(kernel_fb_helper_list);
  46
  47 #include <sys/kdb.h>
  48 #include <sys/param.h>
  49 #include <sys/systm.h>
  50
  51 struct vt_kms_softc {
  52         struct drm_fb_helper    *fb_helper;
  53         struct task              fb_mode_task;
  54 };
  55
  56 /* Call restore out of vt(9) locks. */
  57 static void
  58 vt_restore_fbdev_mode(void *arg, int pending)
  59 {
  60         struct drm_fb_helper *fb_helper;
  61         struct vt_kms_softc *sc;
  62
  63         sc = (struct vt_kms_softc *)arg;
  64         fb_helper = sc->fb_helper;
  65         sx_xlock(&fb_helper->dev->mode_config.mutex);
  66         drm_fb_helper_restore_fbdev_mode(fb_helper);
  67         sx_xunlock(&fb_helper->dev->mode_config.mutex);
  68 }
  69
  70 static int
  71 vt_kms_postswitch(void *arg)
  72 {
  73         struct vt_kms_softc *sc;
  74
  75         sc = (struct vt_kms_softc *)arg;
  76
  77         if (!kdb_active && panicstr == NULL)
  78                 taskqueue_enqueue_fast(taskqueue_thread, &sc->fb_mode_task);
  79         else
  80                 drm_fb_helper_restore_fbdev_mode(sc->fb_helper);
  81
  82         return (0);
  83 }
  84
  85 struct fb_info *
  86 framebuffer_alloc()
  87 {
  88         struct fb_info *info;
  89         struct vt_kms_softc *sc;
  90
  91         info = malloc(sizeof(*info), DRM_MEM_KMS, M_WAITOK | M_ZERO);
  92
  93         sc = malloc(sizeof(*sc), DRM_MEM_KMS, M_WAITOK | M_ZERO);
  94         TASK_INIT(&sc->fb_mode_task, 0, vt_restore_fbdev_mode, sc);
  95
  96         info->fb_priv = sc;
  97         info->enter = &vt_kms_postswitch;
  98
  99         return (info);
 100 }
 101
 102 void
 103 framebuffer_release(struct fb_info *info)
 104 {
 105
 106         free(info->fb_priv, DRM_MEM_KMS);
 107         free(info, DRM_MEM_KMS);
 108 }
 109
 110 static int
 111 fb_get_options(const char *connector_name, char **option)
 112 {
 113         char tunable[64];
 114
 115         /*
 116          * A user may use loader tunables to set a specific mode for the
 117          * console. Tunables are read in the following order:
 118          *     1. kern.vt.fb.modes.$connector_name
 119          *     2. kern.vt.fb.default_mode
 120          *
 121          * Example of a mode specific to the LVDS connector:
 122          *     kern.vt.fb.modes.LVDS="1024x768"
 123          *
 124          * Example of a mode applied to all connectors not having a
 125          * connector-specific mode:
 126          *     kern.vt.fb.default_mode="640x480"
 127          */
 128         snprintf(tunable, sizeof(tunable), "kern.vt.fb.modes.%s",
 129             connector_name);
 130         DRM_INFO("Connector %s: get mode from tunables:\n", connector_name);
 131         DRM_INFO("  - %s\n", tunable);
 132         DRM_INFO("  - kern.vt.fb.default_mode\n");
 133         *option = getenv(tunable);
 134         if (*option == NULL)
 135                 *option = getenv("kern.vt.fb.default_mode");
 136
 137         return (*option != NULL ? 0 : -ENOENT);
 138 }
 139
 140 /**
 141  * DOC: fbdev helpers
 142  *
 143  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
 144  * mode setting driver. They can be used mostly independantely from the crtc
 145  * helper functions used by many drivers to implement the kernel mode setting
 146  * interfaces.
 147  */
 148
 149 /* simple single crtc case helper function */
 150 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 151 {
 152         struct drm_device *dev = fb_helper->dev;
 153         struct drm_connector *connector;
 154         int i;
 155
 156         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 157                 struct drm_fb_helper_connector *fb_helper_connector;
 158
 159                 fb_helper_connector = malloc(sizeof(struct drm_fb_helper_connector),
 160                     DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 161                 if (!fb_helper_connector)
 162                         goto fail;
 163
 164                 fb_helper_connector->connector = connector;
 165                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 166         }
 167         return 0;
 168 fail:
 169         for (i = 0; i < fb_helper->connector_count; i++) {
 170                 free(fb_helper->connector_info[i], DRM_MEM_KMS);
 171                 fb_helper->connector_info[i] = NULL;
 172         }
 173         fb_helper->connector_count = 0;
 174         return -ENOMEM;
 175 }
 176 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 177
 178 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 179 {
 180         struct drm_fb_helper_connector *fb_helper_conn;
 181         int i;
 182
 183         for (i = 0; i < fb_helper->connector_count; i++) {
 184                 struct drm_cmdline_mode *mode;
 185                 struct drm_connector *connector;
 186                 char *option = NULL;
 187
 188                 fb_helper_conn = fb_helper->connector_info[i];
 189                 connector = fb_helper_conn->connector;
 190                 mode = &fb_helper_conn->cmdline_mode;
 191
 192                 /* do something on return - turn off connector maybe */
 193                 if (fb_get_options(drm_get_connector_name(connector), &option))
 194                         continue;
 195
 196                 if (drm_mode_parse_command_line_for_connector(option,
 197                                                               connector,
 198                                                               mode)) {
 199                         if (mode->force) {
 200                                 const char *s;
 201                                 switch (mode->force) {
 202                                 case DRM_FORCE_OFF:
 203                                         s = "OFF";
 204                                         break;
 205                                 case DRM_FORCE_ON_DIGITAL:
 206                                         s = "ON - dig";
 207                                         break;
 208                                 default:
 209                                 case DRM_FORCE_ON:
 210                                         s = "ON";
 211                                         break;
 212                                 }
 213
 214                                 DRM_INFO("forcing %s connector %s\n",
 215                                          drm_get_connector_name(connector), s);
 216                                 connector->force = mode->force;
 217                         }
 218
 219                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 220                                       drm_get_connector_name(connector),
 221                                       mode->xres, mode->yres,
 222                                       mode->refresh_specified ? mode->refresh : 60,
 223                                       mode->rb ? " reduced blanking" : "",
 224                                       mode->margins ? " with margins" : "",
 225                                       mode->interlace ?  " interlaced" : "");
 226                 }
 227
 228                 freeenv(option);
 229         }
 230         return 0;
 231 }
 232
 233 #if 0 && defined(FREEBSD_NOTYET)
 234 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 235 {
 236         uint16_t *r_base, *g_base, *b_base;
 237         int i;
 238
 239         r_base = crtc->gamma_store;
 240         g_base = r_base + crtc->gamma_size;
 241         b_base = g_base + crtc->gamma_size;
 242
 243         for (i = 0; i < crtc->gamma_size; i++)
 244                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 245 }
 246
 247 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 248 {
 249         uint16_t *r_base, *g_base, *b_base;
 250
 251         if (crtc->funcs->gamma_set == NULL)
 252                 return;
 253
 254         r_base = crtc->gamma_store;
 255         g_base = r_base + crtc->gamma_size;
 256         b_base = g_base + crtc->gamma_size;
 257
 258         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 259 }
 260
 261 int drm_fb_helper_debug_enter(struct fb_info *info)
 262 {
 263         struct drm_fb_helper *helper = info->par;
 264         struct drm_crtc_helper_funcs *funcs;
 265         int i;
 266
 267         if (list_empty(&kernel_fb_helper_list))
 268                 return false;
 269
 270         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 271                 for (i = 0; i < helper->crtc_count; i++) {
 272                         struct drm_mode_set *mode_set =
 273                                 &helper->crtc_info[i].mode_set;
 274
 275                         if (!mode_set->crtc->enabled)
 276                                 continue;
 277
 278                         funcs = mode_set->crtc->helper_private;
 279                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 280                         funcs->mode_set_base_atomic(mode_set->crtc,
 281                                                     mode_set->fb,
 282                                                     mode_set->x,
 283                                                     mode_set->y,
 284                                                     ENTER_ATOMIC_MODE_SET);
 285                 }
 286         }
 287
 288         return 0;
 289 }
 290 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 291
 292 /* Find the real fb for a given fb helper CRTC */
 293 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 294 {
 295         struct drm_device *dev = crtc->dev;
 296         struct drm_crtc *c;
 297
 298         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 299                 if (crtc->base.id == c->base.id)
 300                         return c->fb;
 301         }
 302
 303         return NULL;
 304 }
 305
 306 int drm_fb_helper_debug_leave(struct fb_info *info)
 307 {
 308         struct drm_fb_helper *helper = info->par;
 309         struct drm_crtc *crtc;
 310         struct drm_crtc_helper_funcs *funcs;
 311         struct drm_framebuffer *fb;
 312         int i;
 313
 314         for (i = 0; i < helper->crtc_count; i++) {
 315                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 316                 crtc = mode_set->crtc;
 317                 funcs = crtc->helper_private;
 318                 fb = drm_mode_config_fb(crtc);
 319
 320                 if (!crtc->enabled)
 321                         continue;
 322
 323                 if (!fb) {
 324                         DRM_ERROR("no fb to restore??\n");
 325                         continue;
 326                 }
 327
 328                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 329                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 330                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 331         }
 332
 333         return 0;
 334 }
 335 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 336 #endif /* FREEBSD_NOTYET */
 337
 338 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 339 {
 340         bool error = false;
 341         int i, ret;
 342         for (i = 0; i < fb_helper->crtc_count; i++) {
 343                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 344                 ret = mode_set->crtc->funcs->set_config(mode_set);
 345                 if (ret)
 346                         error = true;
 347         }
 348         return error;
 349 }
 350 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 351
 352 static bool drm_fb_helper_force_kernel_mode(void)
 353 {
 354         bool ret, error = false;
 355         struct drm_fb_helper *helper;
 356
 357         if (list_empty(&kernel_fb_helper_list))
 358                 return false;
 359
 360         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 361                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 362                         continue;
 363
 364                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 365                 if (ret)
 366                         error = true;
 367         }
 368         return error;
 369 }
 370
 371 #if 0 && defined(FREEBSD_NOTYET)
 372 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 373                         void *panic_str)
 374 {
 375         /*
 376          * It's a waste of time and effort to switch back to text console
 377          * if the kernel should reboot before panic messages can be seen.
 378          */
 379         if (panic_timeout < 0)
 380                 return 0;
 381
 382         pr_err("panic occurred, switching back to text console\n");
 383         return drm_fb_helper_force_kernel_mode();
 384 }
 385 EXPORT_SYMBOL(drm_fb_helper_panic);
 386
 387 static struct notifier_block paniced = {
 388         .notifier_call = drm_fb_helper_panic,
 389 };
 390 #endif /* FREEBSD_NOTYET */
 391
 392 /**
 393  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 394  *
 395  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 396  */
 397 void drm_fb_helper_restore(void)
 398 {
 399         bool ret;
 400         ret = drm_fb_helper_force_kernel_mode();
 401         if (ret == true)
 402                 DRM_ERROR("Failed to restore crtc configuration\n");
 403 }
 404 EXPORT_SYMBOL(drm_fb_helper_restore);
 405
 406 #ifdef __linux__
 407 #ifdef CONFIG_MAGIC_SYSRQ
 408 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 409 {
 410         drm_fb_helper_restore();
 411 }
 412 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 413
 414 static void drm_fb_helper_sysrq(int dummy1)
 415 {
 416         schedule_work(&drm_fb_helper_restore_work);
 417 }
 418
 419 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 420         .handler = drm_fb_helper_sysrq,
 421         .help_msg = "force-fb(V)",
 422         .action_msg = "Restore framebuffer console",
 423 };
 424 #else
 425 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 426 #endif
 427 #endif
 428
 429 #if 0 && defined(FREEBSD_NOTYET)
 430 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 431 {
 432         struct drm_fb_helper *fb_helper = info->par;
 433         struct drm_device *dev = fb_helper->dev;
 434         struct drm_crtc *crtc;
 435         struct drm_connector *connector;
 436         int i, j;
 437
 438         /*
 439          * For each CRTC in this fb, turn the connectors on/off.
 440          */
 441         sx_xlock(&dev->mode_config.mutex);
 442         for (i = 0; i < fb_helper->crtc_count; i++) {
 443                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 444
 445                 if (!crtc->enabled)
 446                         continue;
 447
 448                 /* Walk the connectors & encoders on this fb turning them on/off */
 449                 for (j = 0; j < fb_helper->connector_count; j++) {
 450                         connector = fb_helper->connector_info[j]->connector;
 451                         connector->funcs->dpms(connector, dpms_mode);
 452                         drm_object_property_set_value(&connector->base,
 453                                 dev->mode_config.dpms_property, dpms_mode);
 454                 }
 455         }
 456         sx_xunlock(&dev->mode_config.mutex);
 457 }
 458
 459 int drm_fb_helper_blank(int blank, struct fb_info *info)
 460 {
 461         switch (blank) {
 462         /* Display: On; HSync: On, VSync: On */
 463         case FB_BLANK_UNBLANK:
 464                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 465                 break;
 466         /* Display: Off; HSync: On, VSync: On */
 467         case FB_BLANK_NORMAL:
 468                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 469                 break;
 470         /* Display: Off; HSync: Off, VSync: On */
 471         case FB_BLANK_HSYNC_SUSPEND:
 472                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 473                 break;
 474         /* Display: Off; HSync: On, VSync: Off */
 475         case FB_BLANK_VSYNC_SUSPEND:
 476                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 477                 break;
 478         /* Display: Off; HSync: Off, VSync: Off */
 479         case FB_BLANK_POWERDOWN:
 480                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 481                 break;
 482         }
 483         return 0;
 484 }
 485 EXPORT_SYMBOL(drm_fb_helper_blank);
 486 #endif /* FREEBSD_NOTYET */
 487
 488 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 489 {
 490         int i;
 491
 492         for (i = 0; i < helper->connector_count; i++)
 493                 free(helper->connector_info[i], DRM_MEM_KMS);
 494         free(helper->connector_info, DRM_MEM_KMS);
 495         for (i = 0; i < helper->crtc_count; i++) {
 496                 free(helper->crtc_info[i].mode_set.connectors, DRM_MEM_KMS);
 497                 if (helper->crtc_info[i].mode_set.mode)
 498                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 499         }
 500         free(helper->crtc_info, DRM_MEM_KMS);
 501 }
 502
 503 int drm_fb_helper_init(struct drm_device *dev,
 504                        struct drm_fb_helper *fb_helper,
 505                        int crtc_count, int max_conn_count)
 506 {
 507         struct drm_crtc *crtc;
 508         int i;
 509
 510         fb_helper->dev = dev;
 511
 512         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 513
 514         fb_helper->crtc_info = malloc(crtc_count * sizeof(struct drm_fb_helper_crtc),
 515             DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 516         if (!fb_helper->crtc_info)
 517                 return -ENOMEM;
 518
 519         fb_helper->crtc_count = crtc_count;
 520         fb_helper->connector_info = malloc(dev->mode_config.num_connector * sizeof(struct drm_fb_helper_connector *),
 521             DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 522         if (!fb_helper->connector_info) {
 523                 free(fb_helper->crtc_info, DRM_MEM_KMS);
 524                 return -ENOMEM;
 525         }
 526         fb_helper->connector_count = 0;
 527
 528         for (i = 0; i < crtc_count; i++) {
 529                 fb_helper->crtc_info[i].mode_set.connectors =
 530                         malloc(max_conn_count *
 531                                 sizeof(struct drm_connector *),
 532                                 DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 533
 534                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 535                         goto out_free;
 536                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 537         }
 538
 539         i = 0;
 540         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 541                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 542                 i++;
 543         }
 544
 545         return 0;
 546 out_free:
 547         drm_fb_helper_crtc_free(fb_helper);
 548         return -ENOMEM;
 549 }
 550 EXPORT_SYMBOL(drm_fb_helper_init);
 551
 552 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 553 {
 554         if (!list_empty(&fb_helper->kernel_fb_list)) {
 555                 list_del(&fb_helper->kernel_fb_list);
 556 #if 0 && defined(FREEBSD_NOTYET)
 557                 if (list_empty(&kernel_fb_helper_list)) {
 558                         pr_info("drm: unregistered panic notifier\n");
 559                         atomic_notifier_chain_unregister(&panic_notifier_list,
 560                                                          &paniced);
 561                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 562                 }
 563 #endif /* FREEBSD_NOTYET */
 564         }
 565
 566         drm_fb_helper_crtc_free(fb_helper);
 567
 568 }
 569 EXPORT_SYMBOL(drm_fb_helper_fini);
 570
 571 #if 0 && defined(FREEBSD_NOTYET)
 572 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 573                      u16 blue, u16 regno, struct fb_info *info)
 574 {
 575         struct drm_fb_helper *fb_helper = info->par;
 576         struct drm_framebuffer *fb = fb_helper->fb;
 577         int pindex;
 578
 579         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 580                 u32 *palette;
 581                 u32 value;
 582                 /* place color in psuedopalette */
 583                 if (regno > 16)
 584                         return -EINVAL;
 585                 palette = (u32 *)info->pseudo_palette;
 586                 red >>= (16 - info->var.red.length);
 587                 green >>= (16 - info->var.green.length);
 588                 blue >>= (16 - info->var.blue.length);
 589                 value = (red << info->var.red.offset) |
 590                         (green << info->var.green.offset) |
 591                         (blue << info->var.blue.offset);
 592                 if (info->var.transp.length > 0) {
 593                         u32 mask = (1 << info->var.transp.length) - 1;
 594                         mask <<= info->var.transp.offset;
 595                         value |= mask;
 596                 }
 597                 palette[regno] = value;
 598                 return 0;
 599         }
 600
 601         pindex = regno;
 602
 603         if (fb->bits_per_pixel == 16) {
 604                 pindex = regno << 3;
 605
 606                 if (fb->depth == 16 && regno > 63)
 607                         return -EINVAL;
 608                 if (fb->depth == 15 && regno > 31)
 609                         return -EINVAL;
 610
 611                 if (fb->depth == 16) {
 612                         u16 r, g, b;
 613                         int i;
 614                         if (regno < 32) {
 615                                 for (i = 0; i < 8; i++)
 616                                         fb_helper->funcs->gamma_set(crtc, red,
 617                                                 green, blue, pindex + i);
 618                         }
 619
 620                         fb_helper->funcs->gamma_get(crtc, &r,
 621                                                     &g, &b,
 622                                                     pindex >> 1);
 623
 624                         for (i = 0; i < 4; i++)
 625                                 fb_helper->funcs->gamma_set(crtc, r,
 626                                                             green, b,
 627                                                             (pindex >> 1) + i);
 628                 }
 629         }
 630
 631         if (fb->depth != 16)
 632                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 633         return 0;
 634 }
 635
 636 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 637 {
 638         struct drm_fb_helper *fb_helper = info->par;
 639         struct drm_crtc_helper_funcs *crtc_funcs;
 640         u16 *red, *green, *blue, *transp;
 641         struct drm_crtc *crtc;
 642         int i, j, rc = 0;
 643         int start;
 644
 645         for (i = 0; i < fb_helper->crtc_count; i++) {
 646                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 647                 crtc_funcs = crtc->helper_private;
 648
 649                 red = cmap->red;
 650                 green = cmap->green;
 651                 blue = cmap->blue;
 652                 transp = cmap->transp;
 653                 start = cmap->start;
 654
 655                 for (j = 0; j < cmap->len; j++) {
 656                         u16 hred, hgreen, hblue, htransp = 0xffff;
 657
 658                         hred = *red++;
 659                         hgreen = *green++;
 660                         hblue = *blue++;
 661
 662                         if (transp)
 663                                 htransp = *transp++;
 664
 665                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 666                         if (rc)
 667                                 return rc;
 668                 }
 669                 crtc_funcs->load_lut(crtc);
 670         }
 671         return rc;
 672 }
 673 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 674
 675 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 676                             struct fb_info *info)
 677 {
 678         struct drm_fb_helper *fb_helper = info->par;
 679         struct drm_framebuffer *fb = fb_helper->fb;
 680         int depth;
 681
 682         if (var->pixclock != 0 || in_dbg_master())
 683                 return -EINVAL;
 684
 685         /* Need to resize the fb object !!! */
 686         if (var->bits_per_pixel > fb->bits_per_pixel ||
 687             var->xres > fb->width || var->yres > fb->height ||
 688             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 689                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 690                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 691                           var->xres, var->yres, var->bits_per_pixel,
 692                           var->xres_virtual, var->yres_virtual,
 693                           fb->width, fb->height, fb->bits_per_pixel);
 694                 return -EINVAL;
 695         }
 696
 697         switch (var->bits_per_pixel) {
 698         case 16:
 699                 depth = (var->green.length == 6) ? 16 : 15;
 700                 break;
 701         case 32:
 702                 depth = (var->transp.length > 0) ? 32 : 24;
 703                 break;
 704         default:
 705                 depth = var->bits_per_pixel;
 706                 break;
 707         }
 708
 709         switch (depth) {
 710         case 8:
 711                 var->red.offset = 0;
 712                 var->green.offset = 0;
 713                 var->blue.offset = 0;
 714                 var->red.length = 8;
 715                 var->green.length = 8;
 716                 var->blue.length = 8;
 717                 var->transp.length = 0;
 718                 var->transp.offset = 0;
 719                 break;
 720         case 15:
 721                 var->red.offset = 10;
 722                 var->green.offset = 5;
 723                 var->blue.offset = 0;
 724                 var->red.length = 5;
 725                 var->green.length = 5;
 726                 var->blue.length = 5;
 727                 var->transp.length = 1;
 728                 var->transp.offset = 15;
 729                 break;
 730         case 16:
 731                 var->red.offset = 11;
 732                 var->green.offset = 5;
 733                 var->blue.offset = 0;
 734                 var->red.length = 5;
 735                 var->green.length = 6;
 736                 var->blue.length = 5;
 737                 var->transp.length = 0;
 738                 var->transp.offset = 0;
 739                 break;
 740         case 24:
 741                 var->red.offset = 16;
 742                 var->green.offset = 8;
 743                 var->blue.offset = 0;
 744                 var->red.length = 8;
 745                 var->green.length = 8;
 746                 var->blue.length = 8;
 747                 var->transp.length = 0;
 748                 var->transp.offset = 0;
 749                 break;
 750         case 32:
 751                 var->red.offset = 16;
 752                 var->green.offset = 8;
 753                 var->blue.offset = 0;
 754                 var->red.length = 8;
 755                 var->green.length = 8;
 756                 var->blue.length = 8;
 757                 var->transp.length = 8;
 758                 var->transp.offset = 24;
 759                 break;
 760         default:
 761                 return -EINVAL;
 762         }
 763         return 0;
 764 }
 765 EXPORT_SYMBOL(drm_fb_helper_check_var);
 766
 767 /* this will let fbcon do the mode init */
 768 int drm_fb_helper_set_par(struct fb_info *info)
 769 {
 770         struct drm_fb_helper *fb_helper = info->par;
 771         struct drm_device *dev = fb_helper->dev;
 772         struct fb_var_screeninfo *var = &info->var;
 773         struct drm_crtc *crtc;
 774         int ret;
 775         int i;
 776
 777         if (var->pixclock != 0) {
 778                 DRM_ERROR("PIXEL CLOCK SET\n");
 779                 return -EINVAL;
 780         }
 781
 782         sx_xlock(&dev->mode_config.mutex);
 783         for (i = 0; i < fb_helper->crtc_count; i++) {
 784                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 785                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 786                 if (ret) {
 787                         sx_xunlock(&dev->mode_config.mutex);
 788                         return ret;
 789                 }
 790         }
 791         sx_xunlock(&dev->mode_config.mutex);
 792
 793         if (fb_helper->delayed_hotplug) {
 794                 fb_helper->delayed_hotplug = false;
 795                 drm_fb_helper_hotplug_event(fb_helper);
 796         }
 797         return 0;
 798 }
 799 EXPORT_SYMBOL(drm_fb_helper_set_par);
 800
 801 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 802                               struct fb_info *info)
 803 {
 804         struct drm_fb_helper *fb_helper = info->par;
 805         struct drm_device *dev = fb_helper->dev;
 806         struct drm_mode_set *modeset;
 807         struct drm_crtc *crtc;
 808         int ret = 0;
 809         int i;
 810
 811         sx_xlock(&dev->mode_config.mutex);
 812         for (i = 0; i < fb_helper->crtc_count; i++) {
 813                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 814
 815                 modeset = &fb_helper->crtc_info[i].mode_set;
 816
 817                 modeset->x = var->xoffset;
 818                 modeset->y = var->yoffset;
 819
 820                 if (modeset->num_connectors) {
 821                         ret = crtc->funcs->set_config(modeset);
 822                         if (!ret) {
 823                                 info->var.xoffset = var->xoffset;
 824                                 info->var.yoffset = var->yoffset;
 825                         }
 826                 }
 827         }
 828         sx_xunlock(&dev->mode_config.mutex);
 829         return ret;
 830 }
 831 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 832 #endif /* FREEBSD_NOTYET */
 833
 834 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 835                                   int preferred_bpp)
 836 {
 837         int new_fb = 0;
 838         int crtc_count = 0;
 839         int i;
 840         struct fb_info *info;
 841         struct drm_fb_helper_surface_size sizes;
 842         int gamma_size = 0;
 843 #if defined(__FreeBSD__)
 844         device_t kdev;
 845 #endif
 846
 847         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 848         sizes.surface_depth = 24;
 849         sizes.surface_bpp = 32;
 850         sizes.fb_width = (unsigned)-1;
 851         sizes.fb_height = (unsigned)-1;
 852
 853         /* if driver picks 8 or 16 by default use that
 854            for both depth/bpp */
 855         if (preferred_bpp != sizes.surface_bpp)
 856                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 857
 858         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 859         for (i = 0; i < fb_helper->connector_count; i++) {
 860                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 861                 struct drm_cmdline_mode *cmdline_mode;
 862
 863                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 864
 865                 if (cmdline_mode->bpp_specified) {
 866                         switch (cmdline_mode->bpp) {
 867                         case 8:
 868                                 sizes.surface_depth = sizes.surface_bpp = 8;
 869                                 break;
 870                         case 15:
 871                                 sizes.surface_depth = 15;
 872                                 sizes.surface_bpp = 16;
 873                                 break;
 874                         case 16:
 875                                 sizes.surface_depth = sizes.surface_bpp = 16;
 876                                 break;
 877                         case 24:
 878                                 sizes.surface_depth = sizes.surface_bpp = 24;
 879                                 break;
 880                         case 32:
 881                                 sizes.surface_depth = 24;
 882                                 sizes.surface_bpp = 32;
 883                                 break;
 884                         }
 885                         break;
 886                 }
 887         }
 888
 889         crtc_count = 0;
 890         for (i = 0; i < fb_helper->crtc_count; i++) {
 891                 struct drm_display_mode *desired_mode;
 892                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 893
 894                 if (desired_mode) {
 895                         if (gamma_size == 0)
 896                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 897                         if (desired_mode->hdisplay < sizes.fb_width)
 898                                 sizes.fb_width = desired_mode->hdisplay;
 899                         if (desired_mode->vdisplay < sizes.fb_height)
 900                                 sizes.fb_height = desired_mode->vdisplay;
 901                         if (desired_mode->hdisplay > sizes.surface_width)
 902                                 sizes.surface_width = desired_mode->hdisplay;
 903                         if (desired_mode->vdisplay > sizes.surface_height)
 904                                 sizes.surface_height = desired_mode->vdisplay;
 905                         crtc_count++;
 906                 }
 907         }
 908
 909         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 910                 /* hmm everyone went away - assume VGA cable just fell out
 911                    and will come back later. */
 912                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 913                 sizes.fb_width = sizes.surface_width = 1024;
 914                 sizes.fb_height = sizes.surface_height = 768;
 915         }
 916
 917         /* push down into drivers */
 918         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 919         if (new_fb < 0)
 920                 return new_fb;
 921
 922         info = fb_helper->fbdev;
 923
 924         /* set the fb pointer */
 925         for (i = 0; i < fb_helper->crtc_count; i++)
 926                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 927
 928 #if defined(__FreeBSD__)
 929         if (new_fb) {
 930                 device_t fbd;
 931                 int ret;
 932
 933                 kdev = fb_helper->dev->dev;
 934                 fbd = device_add_child(kdev, "fbd", device_get_unit(kdev));
 935                 if (fbd != NULL)
 936                         ret = device_probe_and_attach(fbd);
 937                 else
 938                         ret = ENODEV;
 939 #ifdef DEV_VT
 940                 if (ret != 0)
 941                         DRM_ERROR("Failed to attach fbd device: %d\n", ret);
 942 #endif
 943         }
 944 #else
 945         if (new_fb) {
 946                 info->var.pixclock = 0;
 947                 if (register_framebuffer(info) < 0)
 948                         return -EINVAL;
 949
 950                 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 951                                 info->node, info->fix.id);
 952
 953         } else {
 954                 drm_fb_helper_set_par(info);
 955         }
 956 #endif
 957
 958 #if 0 && defined(FREEBSD_NOTYET)
 959         /* Switch back to kernel console on panic */
 960         /* multi card linked list maybe */
 961         if (list_empty(&kernel_fb_helper_list)) {
 962                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
 963                 atomic_notifier_chain_register(&panic_notifier_list,
 964                                                &paniced);
 965                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 966         }
 967 #endif /* FREEBSD_NOTYET */
 968         if (new_fb)
 969                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 970
 971         return 0;
 972 }
 973 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 974
 975 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 976                             uint32_t depth)
 977 {
 978         info->fb_stride = pitch;
 979
 980         return;
 981 }
 982 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 983
 984 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 985                             uint32_t fb_width, uint32_t fb_height)
 986 {
 987         struct drm_framebuffer *fb = fb_helper->fb;
 988         struct vt_kms_softc *sc;
 989
 990         info->fb_name = device_get_nameunit(fb_helper->dev->dev);
 991         info->fb_width = fb->width;
 992         info->fb_height = fb->height;
 993         info->fb_depth = fb->bits_per_pixel;
 994
 995         sc = (struct vt_kms_softc *)info->fb_priv;
 996         sc->fb_helper = fb_helper;
 997 }
 998 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 999
1000 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1001                                                uint32_t maxX,
1002                                                uint32_t maxY)
1003 {
1004         struct drm_connector *connector;
1005         int count = 0;
1006         int i;
1007
1008         for (i = 0; i < fb_helper->connector_count; i++) {
1009                 connector = fb_helper->connector_info[i]->connector;
1010                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1011         }
1012
1013         return count;
1014 }
1015
1016 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1017 {
1018         struct drm_display_mode *mode;
1019
1020         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1021                 if (drm_mode_width(mode) > width ||
1022                     drm_mode_height(mode) > height)
1023                         continue;
1024                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1025                         return mode;
1026         }
1027         return NULL;
1028 }
1029
1030 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1031 {
1032         struct drm_cmdline_mode *cmdline_mode;
1033         cmdline_mode = &fb_connector->cmdline_mode;
1034         return cmdline_mode->specified;
1035 }
1036
1037 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1038                                                       int width, int height)
1039 {
1040         struct drm_cmdline_mode *cmdline_mode;
1041         struct drm_display_mode *mode = NULL;
1042
1043         cmdline_mode = &fb_helper_conn->cmdline_mode;
1044         if (cmdline_mode->specified == false)
1045                 return mode;
1046
1047         /* attempt to find a matching mode in the list of modes
1048          *  we have gotten so far, if not add a CVT mode that conforms
1049          */
1050         if (cmdline_mode->rb || cmdline_mode->margins)
1051                 goto create_mode;
1052
1053         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1054                 /* check width/height */
1055                 if (mode->hdisplay != cmdline_mode->xres ||
1056                     mode->vdisplay != cmdline_mode->yres)
1057                         continue;
1058
1059                 if (cmdline_mode->refresh_specified) {
1060                         if (mode->vrefresh != cmdline_mode->refresh)
1061                                 continue;
1062                 }
1063
1064                 if (cmdline_mode->interlace) {
1065                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1066                                 continue;
1067                 }
1068                 return mode;
1069         }
1070
1071 create_mode:
1072         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1073                                                  cmdline_mode);
1074         list_add(&mode->head, &fb_helper_conn->connector->modes);
1075         return mode;
1076 }
1077
1078 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1079 {
1080         bool enable;
1081
1082         if (strict)
1083                 enable = connector->status == connector_status_connected;
1084         else
1085                 enable = connector->status != connector_status_disconnected;
1086
1087         return enable;
1088 }
1089
1090 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1091                                   bool *enabled)
1092 {
1093         bool any_enabled = false;
1094         struct drm_connector *connector;
1095         int i = 0;
1096
1097         for (i = 0; i < fb_helper->connector_count; i++) {
1098                 connector = fb_helper->connector_info[i]->connector;
1099                 enabled[i] = drm_connector_enabled(connector, true);
1100                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1101                           enabled[i] ? "yes" : "no");
1102                 any_enabled |= enabled[i];
1103         }
1104
1105         if (any_enabled)
1106                 return;
1107
1108         for (i = 0; i < fb_helper->connector_count; i++) {
1109                 connector = fb_helper->connector_info[i]->connector;
1110                 enabled[i] = drm_connector_enabled(connector, false);
1111         }
1112 }
1113
1114 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1115                               struct drm_display_mode **modes,
1116                               bool *enabled, int width, int height)
1117 {
1118         int count, i, j;
1119         bool can_clone = false;
1120         struct drm_fb_helper_connector *fb_helper_conn;
1121         struct drm_display_mode *dmt_mode, *mode;
1122
1123         /* only contemplate cloning in the single crtc case */
1124         if (fb_helper->crtc_count > 1)
1125                 return false;
1126
1127         count = 0;
1128         for (i = 0; i < fb_helper->connector_count; i++) {
1129                 if (enabled[i])
1130                         count++;
1131         }
1132
1133         /* only contemplate cloning if more than one connector is enabled */
1134         if (count <= 1)
1135                 return false;
1136
1137         /* check the command line or if nothing common pick 1024x768 */
1138         can_clone = true;
1139         for (i = 0; i < fb_helper->connector_count; i++) {
1140                 if (!enabled[i])
1141                         continue;
1142                 fb_helper_conn = fb_helper->connector_info[i];
1143                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1144                 if (!modes[i]) {
1145                         can_clone = false;
1146                         break;
1147                 }
1148                 for (j = 0; j < i; j++) {
1149                         if (!enabled[j])
1150                                 continue;
1151                         if (!drm_mode_equal(modes[j], modes[i]))
1152                                 can_clone = false;
1153                 }
1154         }
1155
1156         if (can_clone) {
1157                 DRM_DEBUG_KMS("can clone using command line\n");
1158                 return true;
1159         }
1160
1161         /* try and find a 1024x768 mode on each connector */
1162         can_clone = true;
1163         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1164
1165         for (i = 0; i < fb_helper->connector_count; i++) {
1166
1167                 if (!enabled[i])
1168                         continue;
1169
1170                 fb_helper_conn = fb_helper->connector_info[i];
1171                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1172                         if (drm_mode_equal(mode, dmt_mode))
1173                                 modes[i] = mode;
1174                 }
1175                 if (!modes[i])
1176                         can_clone = false;
1177         }
1178
1179         if (can_clone) {
1180                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1181                 return true;
1182         }
1183         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1184         return false;
1185 }
1186
1187 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1188                                  struct drm_display_mode **modes,
1189                                  bool *enabled, int width, int height)
1190 {
1191         struct drm_fb_helper_connector *fb_helper_conn;
1192         int i;
1193
1194         for (i = 0; i < fb_helper->connector_count; i++) {
1195                 fb_helper_conn = fb_helper->connector_info[i];
1196
1197                 if (enabled[i] == false)
1198                         continue;
1199
1200                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1201                               fb_helper_conn->connector->base.id);
1202
1203                 /* got for command line mode first */
1204                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1205                 if (!modes[i]) {
1206                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1207                                       fb_helper_conn->connector->base.id);
1208                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1209                 }
1210                 /* No preferred modes, pick one off the list */
1211                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1212                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1213                                 break;
1214                 }
1215                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1216                           "none");
1217         }
1218         return true;
1219 }
1220
1221 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1222                           struct drm_fb_helper_crtc **best_crtcs,
1223                           struct drm_display_mode **modes,
1224                           int n, int width, int height)
1225 {
1226         int c, o;
1227         struct drm_device *dev = fb_helper->dev;
1228         struct drm_connector *connector;
1229         struct drm_connector_helper_funcs *connector_funcs;
1230         struct drm_encoder *encoder;
1231         struct drm_fb_helper_crtc *best_crtc;
1232         int my_score, best_score, score;
1233         struct drm_fb_helper_crtc **crtcs, *crtc;
1234         struct drm_fb_helper_connector *fb_helper_conn;
1235
1236         if (n == fb_helper->connector_count)
1237                 return 0;
1238
1239         fb_helper_conn = fb_helper->connector_info[n];
1240         connector = fb_helper_conn->connector;
1241
1242         best_crtcs[n] = NULL;
1243         best_crtc = NULL;
1244         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1245         if (modes[n] == NULL)
1246                 return best_score;
1247
1248         crtcs = malloc(dev->mode_config.num_connector *
1249                         sizeof(struct drm_fb_helper_crtc *), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1250         if (!crtcs)
1251                 return best_score;
1252
1253         my_score = 1;
1254         if (connector->status == connector_status_connected)
1255                 my_score++;
1256         if (drm_has_cmdline_mode(fb_helper_conn))
1257                 my_score++;
1258         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1259                 my_score++;
1260
1261         connector_funcs = connector->helper_private;
1262         encoder = connector_funcs->best_encoder(connector);
1263         if (!encoder)
1264                 goto out;
1265
1266         /* select a crtc for this connector and then attempt to configure
1267            remaining connectors */
1268         for (c = 0; c < fb_helper->crtc_count; c++) {
1269                 crtc = &fb_helper->crtc_info[c];
1270
1271                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1272                         continue;
1273
1274                 for (o = 0; o < n; o++)
1275                         if (best_crtcs[o] == crtc)
1276                                 break;
1277
1278                 if (o < n) {
1279                         /* ignore cloning unless only a single crtc */
1280                         if (fb_helper->crtc_count > 1)
1281                                 continue;
1282
1283                         if (!drm_mode_equal(modes[o], modes[n]))
1284                                 continue;
1285                 }
1286
1287                 crtcs[n] = crtc;
1288                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1289                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1290                                                   width, height);
1291                 if (score > best_score) {
1292                         best_crtc = crtc;
1293                         best_score = score;
1294                         memcpy(best_crtcs, crtcs,
1295                                dev->mode_config.num_connector *
1296                                sizeof(struct drm_fb_helper_crtc *));
1297                 }
1298         }
1299 out:
1300         free(crtcs, DRM_MEM_KMS);
1301         return best_score;
1302 }
1303
1304 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1305 {
1306         struct drm_device *dev = fb_helper->dev;
1307         struct drm_fb_helper_crtc **crtcs;
1308         struct drm_display_mode **modes;
1309         struct drm_mode_set *modeset;
1310         bool *enabled;
1311         int width, height;
1312         int i, ret;
1313
1314         DRM_DEBUG_KMS("\n");
1315
1316         width = dev->mode_config.max_width;
1317         height = dev->mode_config.max_height;
1318
1319         crtcs = malloc(dev->mode_config.num_connector *
1320                         sizeof(struct drm_fb_helper_crtc *), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1321         modes = malloc(dev->mode_config.num_connector *
1322                         sizeof(struct drm_display_mode *), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1323         enabled = malloc(dev->mode_config.num_connector *
1324                           sizeof(bool), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1325         if (!crtcs || !modes || !enabled) {
1326                 DRM_ERROR("Memory allocation failed\n");
1327                 goto out;
1328         }
1329
1330
1331         drm_enable_connectors(fb_helper, enabled);
1332
1333         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1334         if (!ret) {
1335                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1336                 if (!ret)
1337                         DRM_ERROR("Unable to find initial modes\n");
1338         }
1339
1340         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1341
1342         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1343
1344         /* need to set the modesets up here for use later */
1345         /* fill out the connector<->crtc mappings into the modesets */
1346         for (i = 0; i < fb_helper->crtc_count; i++) {
1347                 modeset = &fb_helper->crtc_info[i].mode_set;
1348                 modeset->num_connectors = 0;
1349         }
1350
1351         for (i = 0; i < fb_helper->connector_count; i++) {
1352                 struct drm_display_mode *mode = modes[i];
1353                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1354                 modeset = &fb_crtc->mode_set;
1355
1356                 if (mode && fb_crtc) {
1357                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1358                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1359                         fb_crtc->desired_mode = mode;
1360                         if (modeset->mode)
1361                                 drm_mode_destroy(dev, modeset->mode);
1362                         modeset->mode = drm_mode_duplicate(dev,
1363                                                            fb_crtc->desired_mode);
1364                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1365                 }
1366         }
1367
1368 out:
1369         free(crtcs, DRM_MEM_KMS);
1370         free(modes, DRM_MEM_KMS);
1371         free(enabled, DRM_MEM_KMS);
1372 }
1373
1374 /**
1375  * drm_helper_initial_config - setup a sane initial connector configuration
1376  * @fb_helper: fb_helper device struct
1377  * @bpp_sel: bpp value to use for the framebuffer configuration
1378  *
1379  * LOCKING:
1380  * Called at init time by the driver to set up the @fb_helper initial
1381  * configuration, must take the mode config lock.
1382  *
1383  * Scans the CRTCs and connectors and tries to put together an initial setup.
1384  * At the moment, this is a cloned configuration across all heads with
1385  * a new framebuffer object as the backing store.
1386  *
1387  * RETURNS:
1388  * Zero if everything went ok, nonzero otherwise.
1389  */
1390 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1391 {
1392         struct drm_device *dev = fb_helper->dev;
1393         int count = 0;
1394
1395         /* disable all the possible outputs/crtcs before entering KMS mode */
1396         drm_helper_disable_unused_functions(fb_helper->dev);
1397
1398         drm_fb_helper_parse_command_line(fb_helper);
1399
1400         count = drm_fb_helper_probe_connector_modes(fb_helper,
1401                                                     dev->mode_config.max_width,
1402                                                     dev->mode_config.max_height);
1403         /*
1404          * we shouldn't end up with no modes here.
1405          */
1406         if (count == 0)
1407                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1408
1409         drm_setup_crtcs(fb_helper);
1410
1411         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1412 }
1413 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1414
1415 /**
1416  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1417  *                               probing all the outputs attached to the fb
1418  * @fb_helper: the drm_fb_helper
1419  *
1420  * LOCKING:
1421  * Called at runtime, must take mode config lock.
1422  *
1423  * Scan the connectors attached to the fb_helper and try to put together a
1424  * setup after *notification of a change in output configuration.
1425  *
1426  * RETURNS:
1427  * 0 on success and a non-zero error code otherwise.
1428  */
1429 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1430 {
1431         struct drm_device *dev = fb_helper->dev;
1432         int count = 0;
1433         u32 max_width, max_height, bpp_sel;
1434         int bound = 0, crtcs_bound = 0;
1435         struct drm_crtc *crtc;
1436
1437         if (!fb_helper->fb)
1438                 return 0;
1439
1440         sx_xlock(&dev->mode_config.mutex);
1441         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1442                 if (crtc->fb)
1443                         crtcs_bound++;
1444                 if (crtc->fb == fb_helper->fb)
1445                         bound++;
1446         }
1447
1448         if (bound < crtcs_bound) {
1449                 fb_helper->delayed_hotplug = true;
1450                 sx_xunlock(&dev->mode_config.mutex);
1451                 return 0;
1452         }
1453         DRM_DEBUG_KMS("\n");
1454
1455         max_width = fb_helper->fb->width;
1456         max_height = fb_helper->fb->height;
1457         bpp_sel = fb_helper->fb->bits_per_pixel;
1458
1459         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1460                                                     max_height);
1461         drm_setup_crtcs(fb_helper);
1462         sx_xunlock(&dev->mode_config.mutex);
1463
1464         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1465 }
1466 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);