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 && !KERNEL_PANICKED())
  78                 taskqueue_enqueue(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 = kern_getenv(tunable);
 134         if (*option == NULL)
 135                 *option = kern_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
 343         for (i = 0; i < fb_helper->crtc_count; i++) {
 344                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 345                 ret = mode_set->crtc->funcs->set_config(mode_set);
 346                 if (ret)
 347                         error = true;
 348         }
 349         return error;
 350 }
 351 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 352
 353 static bool drm_fb_helper_force_kernel_mode(void)
 354 {
 355         bool ret, error = false;
 356         struct drm_fb_helper *helper;
 357
 358         if (list_empty(&kernel_fb_helper_list))
 359                 return false;
 360
 361         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 362                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 363                         continue;
 364
 365                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 366                 if (ret)
 367                         error = true;
 368         }
 369         return error;
 370 }
 371
 372 #if 0 && defined(FREEBSD_NOTYET)
 373 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 374                         void *panic_str)
 375 {
 376         /*
 377          * It's a waste of time and effort to switch back to text console
 378          * if the kernel should reboot before panic messages can be seen.
 379          */
 380         if (panic_timeout < 0)
 381                 return 0;
 382
 383         pr_err("panic occurred, switching back to text console\n");
 384         return drm_fb_helper_force_kernel_mode();
 385 }
 386 EXPORT_SYMBOL(drm_fb_helper_panic);
 387
 388 static struct notifier_block paniced = {
 389         .notifier_call = drm_fb_helper_panic,
 390 };
 391 #endif /* FREEBSD_NOTYET */
 392
 393 /**
 394  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 395  *
 396  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 397  */
 398 void drm_fb_helper_restore(void)
 399 {
 400         bool ret;
 401         ret = drm_fb_helper_force_kernel_mode();
 402         if (ret == true)
 403                 DRM_ERROR("Failed to restore crtc configuration\n");
 404 }
 405 EXPORT_SYMBOL(drm_fb_helper_restore);
 406
 407 #ifdef __linux__
 408 #ifdef CONFIG_MAGIC_SYSRQ
 409 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 410 {
 411         drm_fb_helper_restore();
 412 }
 413 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 414
 415 static void drm_fb_helper_sysrq(int dummy1)
 416 {
 417         schedule_work(&drm_fb_helper_restore_work);
 418 }
 419
 420 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 421         .handler = drm_fb_helper_sysrq,
 422         .help_msg = "force-fb(V)",
 423         .action_msg = "Restore framebuffer console",
 424 };
 425 #else
 426 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 427 #endif
 428 #endif
 429
 430 #if 0 && defined(FREEBSD_NOTYET)
 431 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 432 {
 433         struct drm_fb_helper *fb_helper = info->par;
 434         struct drm_device *dev = fb_helper->dev;
 435         struct drm_crtc *crtc;
 436         struct drm_connector *connector;
 437         int i, j;
 438
 439         /*
 440          * For each CRTC in this fb, turn the connectors on/off.
 441          */
 442         sx_xlock(&dev->mode_config.mutex);
 443         for (i = 0; i < fb_helper->crtc_count; i++) {
 444                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 445
 446                 if (!crtc->enabled)
 447                         continue;
 448
 449                 /* Walk the connectors & encoders on this fb turning them on/off */
 450                 for (j = 0; j < fb_helper->connector_count; j++) {
 451                         connector = fb_helper->connector_info[j]->connector;
 452                         connector->funcs->dpms(connector, dpms_mode);
 453                         drm_object_property_set_value(&connector->base,
 454                                 dev->mode_config.dpms_property, dpms_mode);
 455                 }
 456         }
 457         sx_xunlock(&dev->mode_config.mutex);
 458 }
 459
 460 int drm_fb_helper_blank(int blank, struct fb_info *info)
 461 {
 462         switch (blank) {
 463         /* Display: On; HSync: On, VSync: On */
 464         case FB_BLANK_UNBLANK:
 465                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 466                 break;
 467         /* Display: Off; HSync: On, VSync: On */
 468         case FB_BLANK_NORMAL:
 469                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 470                 break;
 471         /* Display: Off; HSync: Off, VSync: On */
 472         case FB_BLANK_HSYNC_SUSPEND:
 473                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 474                 break;
 475         /* Display: Off; HSync: On, VSync: Off */
 476         case FB_BLANK_VSYNC_SUSPEND:
 477                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 478                 break;
 479         /* Display: Off; HSync: Off, VSync: Off */
 480         case FB_BLANK_POWERDOWN:
 481                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 482                 break;
 483         }
 484         return 0;
 485 }
 486 EXPORT_SYMBOL(drm_fb_helper_blank);
 487 #endif /* FREEBSD_NOTYET */
 488
 489 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 490 {
 491         int i;
 492
 493         for (i = 0; i < helper->connector_count; i++)
 494                 free(helper->connector_info[i], DRM_MEM_KMS);
 495         free(helper->connector_info, DRM_MEM_KMS);
 496         for (i = 0; i < helper->crtc_count; i++) {
 497                 free(helper->crtc_info[i].mode_set.connectors, DRM_MEM_KMS);
 498                 if (helper->crtc_info[i].mode_set.mode)
 499                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 500         }
 501         free(helper->crtc_info, DRM_MEM_KMS);
 502 }
 503
 504 int drm_fb_helper_init(struct drm_device *dev,
 505                        struct drm_fb_helper *fb_helper,
 506                        int crtc_count, int max_conn_count)
 507 {
 508         struct drm_crtc *crtc;
 509         int i;
 510
 511         fb_helper->dev = dev;
 512
 513         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 514
 515         fb_helper->crtc_info = malloc(crtc_count * sizeof(struct drm_fb_helper_crtc),
 516             DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 517         if (!fb_helper->crtc_info)
 518                 return -ENOMEM;
 519
 520         fb_helper->crtc_count = crtc_count;
 521         fb_helper->connector_info = malloc(dev->mode_config.num_connector * sizeof(struct drm_fb_helper_connector *),
 522             DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 523         if (!fb_helper->connector_info) {
 524                 free(fb_helper->crtc_info, DRM_MEM_KMS);
 525                 return -ENOMEM;
 526         }
 527         fb_helper->connector_count = 0;
 528
 529         for (i = 0; i < crtc_count; i++) {
 530                 fb_helper->crtc_info[i].mode_set.connectors =
 531                         malloc(max_conn_count *
 532                                 sizeof(struct drm_connector *),
 533                                 DRM_MEM_KMS, M_NOWAIT | M_ZERO);
 534
 535                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 536                         goto out_free;
 537                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 538         }
 539
 540         i = 0;
 541         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 542                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 543                 i++;
 544         }
 545
 546         return 0;
 547 out_free:
 548         drm_fb_helper_crtc_free(fb_helper);
 549         return -ENOMEM;
 550 }
 551 EXPORT_SYMBOL(drm_fb_helper_init);
 552
 553 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 554 {
 555         if (!list_empty(&fb_helper->kernel_fb_list)) {
 556                 list_del(&fb_helper->kernel_fb_list);
 557 #if 0 && defined(FREEBSD_NOTYET)
 558                 if (list_empty(&kernel_fb_helper_list)) {
 559                         pr_info("drm: unregistered panic notifier\n");
 560                         atomic_notifier_chain_unregister(&panic_notifier_list,
 561                                                          &paniced);
 562                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 563                 }
 564 #endif /* FREEBSD_NOTYET */
 565         }
 566
 567         drm_fb_helper_crtc_free(fb_helper);
 568
 569 }
 570 EXPORT_SYMBOL(drm_fb_helper_fini);
 571
 572 #if 0 && defined(FREEBSD_NOTYET)
 573 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 574                      u16 blue, u16 regno, struct fb_info *info)
 575 {
 576         struct drm_fb_helper *fb_helper = info->par;
 577         struct drm_framebuffer *fb = fb_helper->fb;
 578         int pindex;
 579
 580         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 581                 u32 *palette;
 582                 u32 value;
 583                 /* place color in pseudopalette */
 584                 if (regno > 16)
 585                         return -EINVAL;
 586                 palette = (u32 *)info->pseudo_palette;
 587                 red >>= (16 - info->var.red.length);
 588                 green >>= (16 - info->var.green.length);
 589                 blue >>= (16 - info->var.blue.length);
 590                 value = (red << info->var.red.offset) |
 591                         (green << info->var.green.offset) |
 592                         (blue << info->var.blue.offset);
 593                 if (info->var.transp.length > 0) {
 594                         u32 mask = (1 << info->var.transp.length) - 1;
 595                         mask <<= info->var.transp.offset;
 596                         value |= mask;
 597                 }
 598                 palette[regno] = value;
 599                 return 0;
 600         }
 601
 602         pindex = regno;
 603
 604         if (fb->bits_per_pixel == 16) {
 605                 pindex = regno << 3;
 606
 607                 if (fb->depth == 16 && regno > 63)
 608                         return -EINVAL;
 609                 if (fb->depth == 15 && regno > 31)
 610                         return -EINVAL;
 611
 612                 if (fb->depth == 16) {
 613                         u16 r, g, b;
 614                         int i;
 615                         if (regno < 32) {
 616                                 for (i = 0; i < 8; i++)
 617                                         fb_helper->funcs->gamma_set(crtc, red,
 618                                                 green, blue, pindex + i);
 619                         }
 620
 621                         fb_helper->funcs->gamma_get(crtc, &r,
 622                                                     &g, &b,
 623                                                     pindex >> 1);
 624
 625                         for (i = 0; i < 4; i++)
 626                                 fb_helper->funcs->gamma_set(crtc, r,
 627                                                             green, b,
 628                                                             (pindex >> 1) + i);
 629                 }
 630         }
 631
 632         if (fb->depth != 16)
 633                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 634         return 0;
 635 }
 636
 637 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 638 {
 639         struct drm_fb_helper *fb_helper = info->par;
 640         struct drm_crtc_helper_funcs *crtc_funcs;
 641         u16 *red, *green, *blue, *transp;
 642         struct drm_crtc *crtc;
 643         int i, j, rc = 0;
 644         int start;
 645
 646         for (i = 0; i < fb_helper->crtc_count; i++) {
 647                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 648                 crtc_funcs = crtc->helper_private;
 649
 650                 red = cmap->red;
 651                 green = cmap->green;
 652                 blue = cmap->blue;
 653                 transp = cmap->transp;
 654                 start = cmap->start;
 655
 656                 for (j = 0; j < cmap->len; j++) {
 657                         u16 hred, hgreen, hblue, htransp = 0xffff;
 658
 659                         hred = *red++;
 660                         hgreen = *green++;
 661                         hblue = *blue++;
 662
 663                         if (transp)
 664                                 htransp = *transp++;
 665
 666                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 667                         if (rc)
 668                                 return rc;
 669                 }
 670                 crtc_funcs->load_lut(crtc);
 671         }
 672         return rc;
 673 }
 674 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 675
 676 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 677                             struct fb_info *info)
 678 {
 679         struct drm_fb_helper *fb_helper = info->par;
 680         struct drm_framebuffer *fb = fb_helper->fb;
 681         int depth;
 682
 683         if (var->pixclock != 0 || in_dbg_master())
 684                 return -EINVAL;
 685
 686         /* Need to resize the fb object !!! */
 687         if (var->bits_per_pixel > fb->bits_per_pixel ||
 688             var->xres > fb->width || var->yres > fb->height ||
 689             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 690                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 691                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 692                           var->xres, var->yres, var->bits_per_pixel,
 693                           var->xres_virtual, var->yres_virtual,
 694                           fb->width, fb->height, fb->bits_per_pixel);
 695                 return -EINVAL;
 696         }
 697
 698         switch (var->bits_per_pixel) {
 699         case 16:
 700                 depth = (var->green.length == 6) ? 16 : 15;
 701                 break;
 702         case 32:
 703                 depth = (var->transp.length > 0) ? 32 : 24;
 704                 break;
 705         default:
 706                 depth = var->bits_per_pixel;
 707                 break;
 708         }
 709
 710         switch (depth) {
 711         case 8:
 712                 var->red.offset = 0;
 713                 var->green.offset = 0;
 714                 var->blue.offset = 0;
 715                 var->red.length = 8;
 716                 var->green.length = 8;
 717                 var->blue.length = 8;
 718                 var->transp.length = 0;
 719                 var->transp.offset = 0;
 720                 break;
 721         case 15:
 722                 var->red.offset = 10;
 723                 var->green.offset = 5;
 724                 var->blue.offset = 0;
 725                 var->red.length = 5;
 726                 var->green.length = 5;
 727                 var->blue.length = 5;
 728                 var->transp.length = 1;
 729                 var->transp.offset = 15;
 730                 break;
 731         case 16:
 732                 var->red.offset = 11;
 733                 var->green.offset = 5;
 734                 var->blue.offset = 0;
 735                 var->red.length = 5;
 736                 var->green.length = 6;
 737                 var->blue.length = 5;
 738                 var->transp.length = 0;
 739                 var->transp.offset = 0;
 740                 break;
 741         case 24:
 742                 var->red.offset = 16;
 743                 var->green.offset = 8;
 744                 var->blue.offset = 0;
 745                 var->red.length = 8;
 746                 var->green.length = 8;
 747                 var->blue.length = 8;
 748                 var->transp.length = 0;
 749                 var->transp.offset = 0;
 750                 break;
 751         case 32:
 752                 var->red.offset = 16;
 753                 var->green.offset = 8;
 754                 var->blue.offset = 0;
 755                 var->red.length = 8;
 756                 var->green.length = 8;
 757                 var->blue.length = 8;
 758                 var->transp.length = 8;
 759                 var->transp.offset = 24;
 760                 break;
 761         default:
 762                 return -EINVAL;
 763         }
 764         return 0;
 765 }
 766 EXPORT_SYMBOL(drm_fb_helper_check_var);
 767
 768 /* this will let fbcon do the mode init */
 769 int drm_fb_helper_set_par(struct fb_info *info)
 770 {
 771         struct drm_fb_helper *fb_helper = info->par;
 772         struct drm_device *dev = fb_helper->dev;
 773         struct fb_var_screeninfo *var = &info->var;
 774         struct drm_crtc *crtc;
 775         int ret;
 776         int i;
 777
 778         if (var->pixclock != 0) {
 779                 DRM_ERROR("PIXEL CLOCK SET\n");
 780                 return -EINVAL;
 781         }
 782
 783         sx_xlock(&dev->mode_config.mutex);
 784         for (i = 0; i < fb_helper->crtc_count; i++) {
 785                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 786                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 787                 if (ret) {
 788                         sx_xunlock(&dev->mode_config.mutex);
 789                         return ret;
 790                 }
 791         }
 792         sx_xunlock(&dev->mode_config.mutex);
 793
 794         if (fb_helper->delayed_hotplug) {
 795                 fb_helper->delayed_hotplug = false;
 796                 drm_fb_helper_hotplug_event(fb_helper);
 797         }
 798         return 0;
 799 }
 800 EXPORT_SYMBOL(drm_fb_helper_set_par);
 801
 802 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 803                               struct fb_info *info)
 804 {
 805         struct drm_fb_helper *fb_helper = info->par;
 806         struct drm_device *dev = fb_helper->dev;
 807         struct drm_mode_set *modeset;
 808         struct drm_crtc *crtc;
 809         int ret = 0;
 810         int i;
 811
 812         sx_xlock(&dev->mode_config.mutex);
 813         for (i = 0; i < fb_helper->crtc_count; i++) {
 814                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 815
 816                 modeset = &fb_helper->crtc_info[i].mode_set;
 817
 818                 modeset->x = var->xoffset;
 819                 modeset->y = var->yoffset;
 820
 821                 if (modeset->num_connectors) {
 822                         ret = crtc->funcs->set_config(modeset);
 823                         if (!ret) {
 824                                 info->var.xoffset = var->xoffset;
 825                                 info->var.yoffset = var->yoffset;
 826                         }
 827                 }
 828         }
 829         sx_xunlock(&dev->mode_config.mutex);
 830         return ret;
 831 }
 832 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 833 #endif /* FREEBSD_NOTYET */
 834
 835 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 836                                   int preferred_bpp)
 837 {
 838         int new_fb = 0;
 839         int crtc_count = 0;
 840         int i;
 841         struct fb_info *info;
 842         struct drm_fb_helper_surface_size sizes;
 843         int gamma_size = 0;
 844 #if defined(__FreeBSD__)
 845         struct drm_crtc *crtc;
 846         struct drm_device *dev;
 847         int ret;
 848         device_t kdev;
 849 #endif
 850
 851         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 852         sizes.surface_depth = 24;
 853         sizes.surface_bpp = 32;
 854         sizes.fb_width = (unsigned)-1;
 855         sizes.fb_height = (unsigned)-1;
 856
 857         /* if driver picks 8 or 16 by default use that
 858            for both depth/bpp */
 859         if (preferred_bpp != sizes.surface_bpp)
 860                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 861
 862         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 863         for (i = 0; i < fb_helper->connector_count; i++) {
 864                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 865                 struct drm_cmdline_mode *cmdline_mode;
 866
 867                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 868
 869                 if (cmdline_mode->bpp_specified) {
 870                         switch (cmdline_mode->bpp) {
 871                         case 8:
 872                                 sizes.surface_depth = sizes.surface_bpp = 8;
 873                                 break;
 874                         case 15:
 875                                 sizes.surface_depth = 15;
 876                                 sizes.surface_bpp = 16;
 877                                 break;
 878                         case 16:
 879                                 sizes.surface_depth = sizes.surface_bpp = 16;
 880                                 break;
 881                         case 24:
 882                                 sizes.surface_depth = sizes.surface_bpp = 24;
 883                                 break;
 884                         case 32:
 885                                 sizes.surface_depth = 24;
 886                                 sizes.surface_bpp = 32;
 887                                 break;
 888                         }
 889                         break;
 890                 }
 891         }
 892
 893         crtc_count = 0;
 894         for (i = 0; i < fb_helper->crtc_count; i++) {
 895                 struct drm_display_mode *desired_mode;
 896                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 897
 898                 if (desired_mode) {
 899                         if (gamma_size == 0)
 900                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 901                         if (desired_mode->hdisplay < sizes.fb_width)
 902                                 sizes.fb_width = desired_mode->hdisplay;
 903                         if (desired_mode->vdisplay < sizes.fb_height)
 904                                 sizes.fb_height = desired_mode->vdisplay;
 905                         if (desired_mode->hdisplay > sizes.surface_width)
 906                                 sizes.surface_width = desired_mode->hdisplay;
 907                         if (desired_mode->vdisplay > sizes.surface_height)
 908                                 sizes.surface_height = desired_mode->vdisplay;
 909                         crtc_count++;
 910                 }
 911         }
 912
 913         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 914                 /* hmm everyone went away - assume VGA cable just fell out
 915                    and will come back later. */
 916                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 917                 sizes.fb_width = sizes.surface_width = 1024;
 918                 sizes.fb_height = sizes.surface_height = 768;
 919         }
 920
 921         /* push down into drivers */
 922         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 923         if (new_fb < 0)
 924                 return new_fb;
 925
 926         info = fb_helper->fbdev;
 927
 928         kdev = fb_helper->dev->dev;
 929         info->fb_video_dev = device_get_parent(kdev);
 930
 931         /* set the fb pointer */
 932         for (i = 0; i < fb_helper->crtc_count; i++)
 933                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 934
 935 #if defined(__FreeBSD__)
 936         if (new_fb) {
 937                 int ret;
 938
 939                 info->fb_fbd_dev = device_add_child(kdev, "fbd",
 940                     device_get_unit(kdev));
 941                 if (info->fb_fbd_dev != NULL)
 942                         ret = device_probe_and_attach(info->fb_fbd_dev);
 943                 else
 944                         ret = ENODEV;
 945 #ifdef DEV_VT
 946                 if (ret != 0)
 947                         DRM_ERROR("Failed to attach fbd device: %d\n", ret);
 948 #endif
 949         } else {
 950                 /* Modified version of drm_fb_helper_set_par() */
 951                 dev = fb_helper->dev;
 952                 sx_xlock(&dev->mode_config.mutex);
 953                 for (i = 0; i < fb_helper->crtc_count; i++) {
 954                         crtc = fb_helper->crtc_info[i].mode_set.crtc;
 955                         ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 956                         if (ret) {
 957                                 sx_xunlock(&dev->mode_config.mutex);
 958                                 return ret;
 959                         }
 960                 }
 961                 sx_xunlock(&dev->mode_config.mutex);
 962
 963                 if (fb_helper->delayed_hotplug) {
 964                         fb_helper->delayed_hotplug = false;
 965                         drm_fb_helper_hotplug_event(fb_helper);
 966                 }
 967         }
 968 #else
 969         if (new_fb) {
 970                 info->var.pixclock = 0;
 971                 if (register_framebuffer(info) < 0)
 972                         return -EINVAL;
 973
 974                 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 975                                 info->node, info->fix.id);
 976
 977         } else {
 978                 drm_fb_helper_set_par(info);
 979         }
 980 #endif
 981
 982 #if 0 && defined(FREEBSD_NOTYET)
 983         /* Switch back to kernel console on panic */
 984         /* multi card linked list maybe */
 985         if (list_empty(&kernel_fb_helper_list)) {
 986                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
 987                 atomic_notifier_chain_register(&panic_notifier_list,
 988                                                &paniced);
 989                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 990         }
 991 #endif /* FREEBSD_NOTYET */
 992         if (new_fb)
 993                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 994
 995         return 0;
 996 }
 997 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 998
 999 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1000                             uint32_t depth)
1001 {
1002         info->fb_stride = pitch;
1003
1004         return;
1005 }
1006 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1007
1008 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1009                             uint32_t fb_width, uint32_t fb_height)
1010 {
1011         struct drm_framebuffer *fb = fb_helper->fb;
1012         struct vt_kms_softc *sc;
1013
1014         info->fb_name = device_get_nameunit(fb_helper->dev->dev);
1015         info->fb_width = fb->width;
1016         info->fb_height = fb->height;
1017         info->fb_depth = fb->bits_per_pixel;
1018
1019         sc = (struct vt_kms_softc *)info->fb_priv;
1020         sc->fb_helper = fb_helper;
1021 }
1022 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1023
1024 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1025                                                uint32_t maxX,
1026                                                uint32_t maxY)
1027 {
1028         struct drm_connector *connector;
1029         int count = 0;
1030         int i;
1031
1032         for (i = 0; i < fb_helper->connector_count; i++) {
1033                 connector = fb_helper->connector_info[i]->connector;
1034                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1035         }
1036
1037         return count;
1038 }
1039
1040 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1041 {
1042         struct drm_display_mode *mode;
1043
1044         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1045                 if (drm_mode_width(mode) > width ||
1046                     drm_mode_height(mode) > height)
1047                         continue;
1048                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1049                         return mode;
1050         }
1051         return NULL;
1052 }
1053
1054 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1055 {
1056         struct drm_cmdline_mode *cmdline_mode;
1057         cmdline_mode = &fb_connector->cmdline_mode;
1058         return cmdline_mode->specified;
1059 }
1060
1061 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1062                                                       int width, int height)
1063 {
1064         struct drm_cmdline_mode *cmdline_mode;
1065         struct drm_display_mode *mode = NULL;
1066
1067         cmdline_mode = &fb_helper_conn->cmdline_mode;
1068         if (cmdline_mode->specified == false)
1069                 return mode;
1070
1071         /* attempt to find a matching mode in the list of modes
1072          *  we have gotten so far, if not add a CVT mode that conforms
1073          */
1074         if (cmdline_mode->rb || cmdline_mode->margins)
1075                 goto create_mode;
1076
1077         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1078                 /* check width/height */
1079                 if (mode->hdisplay != cmdline_mode->xres ||
1080                     mode->vdisplay != cmdline_mode->yres)
1081                         continue;
1082
1083                 if (cmdline_mode->refresh_specified) {
1084                         if (mode->vrefresh != cmdline_mode->refresh)
1085                                 continue;
1086                 }
1087
1088                 if (cmdline_mode->interlace) {
1089                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1090                                 continue;
1091                 }
1092                 return mode;
1093         }
1094
1095 create_mode:
1096         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1097                                                  cmdline_mode);
1098         list_add(&mode->head, &fb_helper_conn->connector->modes);
1099         return mode;
1100 }
1101
1102 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1103 {
1104         bool enable;
1105
1106         if (strict)
1107                 enable = connector->status == connector_status_connected;
1108         else
1109                 enable = connector->status != connector_status_disconnected;
1110
1111         return enable;
1112 }
1113
1114 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1115                                   bool *enabled)
1116 {
1117         bool any_enabled = false;
1118         struct drm_connector *connector;
1119         int i = 0;
1120
1121         for (i = 0; i < fb_helper->connector_count; i++) {
1122                 connector = fb_helper->connector_info[i]->connector;
1123                 enabled[i] = drm_connector_enabled(connector, true);
1124                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1125                           enabled[i] ? "yes" : "no");
1126                 any_enabled |= enabled[i];
1127         }
1128
1129         if (any_enabled)
1130                 return;
1131
1132         for (i = 0; i < fb_helper->connector_count; i++) {
1133                 connector = fb_helper->connector_info[i]->connector;
1134                 enabled[i] = drm_connector_enabled(connector, false);
1135         }
1136 }
1137
1138 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1139                               struct drm_display_mode **modes,
1140                               bool *enabled, int width, int height)
1141 {
1142         int count, i, j;
1143         bool can_clone = false;
1144         struct drm_fb_helper_connector *fb_helper_conn;
1145         struct drm_display_mode *dmt_mode, *mode;
1146
1147         /* only contemplate cloning in the single crtc case */
1148         if (fb_helper->crtc_count > 1)
1149                 return false;
1150
1151         count = 0;
1152         for (i = 0; i < fb_helper->connector_count; i++) {
1153                 if (enabled[i])
1154                         count++;
1155         }
1156
1157         /* only contemplate cloning if more than one connector is enabled */
1158         if (count <= 1)
1159                 return false;
1160
1161         /* check the command line or if nothing common pick 1024x768 */
1162         can_clone = true;
1163         for (i = 0; i < fb_helper->connector_count; i++) {
1164                 if (!enabled[i])
1165                         continue;
1166                 fb_helper_conn = fb_helper->connector_info[i];
1167                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1168                 if (!modes[i]) {
1169                         can_clone = false;
1170                         break;
1171                 }
1172                 for (j = 0; j < i; j++) {
1173                         if (!enabled[j])
1174                                 continue;
1175                         if (!drm_mode_equal(modes[j], modes[i]))
1176                                 can_clone = false;
1177                 }
1178         }
1179
1180         if (can_clone) {
1181                 DRM_DEBUG_KMS("can clone using command line\n");
1182                 return true;
1183         }
1184
1185         /* try and find a 1024x768 mode on each connector */
1186         can_clone = true;
1187         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1188
1189         for (i = 0; i < fb_helper->connector_count; i++) {
1190
1191                 if (!enabled[i])
1192                         continue;
1193
1194                 fb_helper_conn = fb_helper->connector_info[i];
1195                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1196                         if (drm_mode_equal(mode, dmt_mode))
1197                                 modes[i] = mode;
1198                 }
1199                 if (!modes[i])
1200                         can_clone = false;
1201         }
1202
1203         if (can_clone) {
1204                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1205                 return true;
1206         }
1207         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1208         return false;
1209 }
1210
1211 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1212                                  struct drm_display_mode **modes,
1213                                  bool *enabled, int width, int height)
1214 {
1215         struct drm_fb_helper_connector *fb_helper_conn;
1216         int i;
1217
1218         for (i = 0; i < fb_helper->connector_count; i++) {
1219                 fb_helper_conn = fb_helper->connector_info[i];
1220
1221                 if (enabled[i] == false)
1222                         continue;
1223
1224                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1225                               fb_helper_conn->connector->base.id);
1226
1227                 /* got for command line mode first */
1228                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1229                 if (!modes[i]) {
1230                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1231                                       fb_helper_conn->connector->base.id);
1232                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1233                 }
1234                 /* No preferred modes, pick one off the list */
1235                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1236                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1237                                 break;
1238                 }
1239                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1240                           "none");
1241         }
1242         return true;
1243 }
1244
1245 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1246                           struct drm_fb_helper_crtc **best_crtcs,
1247                           struct drm_display_mode **modes,
1248                           int n, int width, int height)
1249 {
1250         int c, o;
1251         struct drm_device *dev = fb_helper->dev;
1252         struct drm_connector *connector;
1253         struct drm_connector_helper_funcs *connector_funcs;
1254         struct drm_encoder *encoder;
1255         struct drm_fb_helper_crtc *best_crtc;
1256         int my_score, best_score, score;
1257         struct drm_fb_helper_crtc **crtcs, *crtc;
1258         struct drm_fb_helper_connector *fb_helper_conn;
1259
1260         if (n == fb_helper->connector_count)
1261                 return 0;
1262
1263         fb_helper_conn = fb_helper->connector_info[n];
1264         connector = fb_helper_conn->connector;
1265
1266         best_crtcs[n] = NULL;
1267         best_crtc = NULL;
1268         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1269         if (modes[n] == NULL)
1270                 return best_score;
1271
1272         crtcs = malloc(dev->mode_config.num_connector *
1273                         sizeof(struct drm_fb_helper_crtc *), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1274         if (!crtcs)
1275                 return best_score;
1276
1277         my_score = 1;
1278         if (connector->status == connector_status_connected)
1279                 my_score++;
1280         if (drm_has_cmdline_mode(fb_helper_conn))
1281                 my_score++;
1282         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1283                 my_score++;
1284
1285         connector_funcs = connector->helper_private;
1286         encoder = connector_funcs->best_encoder(connector);
1287         if (!encoder)
1288                 goto out;
1289
1290         /* select a crtc for this connector and then attempt to configure
1291            remaining connectors */
1292         for (c = 0; c < fb_helper->crtc_count; c++) {
1293                 crtc = &fb_helper->crtc_info[c];
1294
1295                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1296                         continue;
1297
1298                 for (o = 0; o < n; o++)
1299                         if (best_crtcs[o] == crtc)
1300                                 break;
1301
1302                 if (o < n) {
1303                         /* ignore cloning unless only a single crtc */
1304                         if (fb_helper->crtc_count > 1)
1305                                 continue;
1306
1307                         if (!drm_mode_equal(modes[o], modes[n]))
1308                                 continue;
1309                 }
1310
1311                 crtcs[n] = crtc;
1312                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1313                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1314                                                   width, height);
1315                 if (score > best_score) {
1316                         best_crtc = crtc;
1317                         best_score = score;
1318                         memcpy(best_crtcs, crtcs,
1319                                dev->mode_config.num_connector *
1320                                sizeof(struct drm_fb_helper_crtc *));
1321                 }
1322         }
1323 out:
1324         free(crtcs, DRM_MEM_KMS);
1325         return best_score;
1326 }
1327
1328 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1329 {
1330         struct drm_device *dev = fb_helper->dev;
1331         struct drm_fb_helper_crtc **crtcs;
1332         struct drm_display_mode **modes;
1333         struct drm_mode_set *modeset;
1334         bool *enabled;
1335         int width, height;
1336         int i, ret;
1337
1338         DRM_DEBUG_KMS("\n");
1339
1340         width = dev->mode_config.max_width;
1341         height = dev->mode_config.max_height;
1342
1343         crtcs = malloc(dev->mode_config.num_connector *
1344                         sizeof(struct drm_fb_helper_crtc *), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1345         modes = malloc(dev->mode_config.num_connector *
1346                         sizeof(struct drm_display_mode *), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1347         enabled = malloc(dev->mode_config.num_connector *
1348                           sizeof(bool), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
1349         if (!crtcs || !modes || !enabled) {
1350                 DRM_ERROR("Memory allocation failed\n");
1351                 goto out;
1352         }
1353
1354
1355         drm_enable_connectors(fb_helper, enabled);
1356
1357         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1358         if (!ret) {
1359                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1360                 if (!ret)
1361                         DRM_ERROR("Unable to find initial modes\n");
1362         }
1363
1364         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1365
1366         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1367
1368         /* need to set the modesets up here for use later */
1369         /* fill out the connector<->crtc mappings into the modesets */
1370         for (i = 0; i < fb_helper->crtc_count; i++) {
1371                 modeset = &fb_helper->crtc_info[i].mode_set;
1372                 modeset->num_connectors = 0;
1373         }
1374
1375         for (i = 0; i < fb_helper->connector_count; i++) {
1376                 struct drm_display_mode *mode = modes[i];
1377                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1378                 modeset = &fb_crtc->mode_set;
1379
1380                 if (mode && fb_crtc) {
1381                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1382                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1383                         fb_crtc->desired_mode = mode;
1384                         if (modeset->mode)
1385                                 drm_mode_destroy(dev, modeset->mode);
1386                         modeset->mode = drm_mode_duplicate(dev,
1387                                                            fb_crtc->desired_mode);
1388                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1389                 }
1390         }
1391
1392 out:
1393         free(crtcs, DRM_MEM_KMS);
1394         free(modes, DRM_MEM_KMS);
1395         free(enabled, DRM_MEM_KMS);
1396 }
1397
1398 /**
1399  * drm_helper_initial_config - setup a sane initial connector configuration
1400  * @fb_helper: fb_helper device struct
1401  * @bpp_sel: bpp value to use for the framebuffer configuration
1402  *
1403  * LOCKING:
1404  * Called at init time by the driver to set up the @fb_helper initial
1405  * configuration, must take the mode config lock.
1406  *
1407  * Scans the CRTCs and connectors and tries to put together an initial setup.
1408  * At the moment, this is a cloned configuration across all heads with
1409  * a new framebuffer object as the backing store.
1410  *
1411  * RETURNS:
1412  * Zero if everything went ok, nonzero otherwise.
1413  */
1414 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1415 {
1416         struct drm_device *dev = fb_helper->dev;
1417         int count = 0;
1418
1419         /* disable all the possible outputs/crtcs before entering KMS mode */
1420         drm_helper_disable_unused_functions(fb_helper->dev);
1421
1422         drm_fb_helper_parse_command_line(fb_helper);
1423
1424         count = drm_fb_helper_probe_connector_modes(fb_helper,
1425                                                     dev->mode_config.max_width,
1426                                                     dev->mode_config.max_height);
1427         /*
1428          * we shouldn't end up with no modes here.
1429          */
1430         if (count == 0)
1431                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1432
1433         drm_setup_crtcs(fb_helper);
1434
1435         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1436 }
1437 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1438
1439 /**
1440  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1441  *                               probing all the outputs attached to the fb
1442  * @fb_helper: the drm_fb_helper
1443  *
1444  * LOCKING:
1445  * Called at runtime, must take mode config lock.
1446  *
1447  * Scan the connectors attached to the fb_helper and try to put together a
1448  * setup after *notification of a change in output configuration.
1449  *
1450  * RETURNS:
1451  * 0 on success and a non-zero error code otherwise.
1452  */
1453 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1454 {
1455         struct drm_device *dev = fb_helper->dev;
1456         int count = 0;
1457         u32 max_width, max_height, bpp_sel;
1458         int bound = 0, crtcs_bound = 0;
1459         struct drm_crtc *crtc;
1460
1461         if (!fb_helper->fb)
1462                 return 0;
1463
1464         sx_xlock(&dev->mode_config.mutex);
1465         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1466                 if (crtc->fb)
1467                         crtcs_bound++;
1468                 if (crtc->fb == fb_helper->fb)
1469                         bound++;
1470         }
1471
1472         if (bound < crtcs_bound) {
1473                 fb_helper->delayed_hotplug = true;
1474                 sx_xunlock(&dev->mode_config.mutex);
1475                 return 0;
1476         }
1477         DRM_DEBUG_KMS("\n");
1478
1479         max_width = fb_helper->fb->width;
1480         max_height = fb_helper->fb->height;
1481         bpp_sel = fb_helper->fb->bits_per_pixel;
1482
1483         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1484                                                     max_height);
1485         drm_setup_crtcs(fb_helper);
1486         sx_xunlock(&dev->mode_config.mutex);
1487
1488         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1489 }
1490 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);