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