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