SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/fb.h>
  33 #include "drmP.h"
  34 #include "drm_crtc.h"
  35 #include "drm_fb_helper.h"
  36 #include "drm_crtc_helper.h"
  37
  38 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  39 MODULE_DESCRIPTION("DRM KMS helper");
  40 MODULE_LICENSE("GPL and additional rights");
  41
  42 static LIST_HEAD(kernel_fb_helper_list);
  43
  44 int drm_fb_helper_add_connector(struct drm_connector *connector)
  45 {
  46         connector->fb_helper_private = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  47         if (!connector->fb_helper_private)
  48                 return -ENOMEM;
  49
  50         return 0;
  51 }
  52 EXPORT_SYMBOL(drm_fb_helper_add_connector);
  53
  54 /**
  55  * drm_fb_helper_connector_parse_command_line - parse command line for connector
  56  * @connector - connector to parse line for
  57  * @mode_option - per connector mode option
  58  *
  59  * This parses the connector specific then generic command lines for
  60  * modes and options to configure the connector.
  61  *
  62  * This uses the same parameters as the fb modedb.c, except for extra
  63  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
  64  *
  65  * enable/enable Digital/disable bit at the end
  66  */
  67 static bool drm_fb_helper_connector_parse_command_line(struct drm_connector *connector,
  68                                                        const char *mode_option)
  69 {
  70         const char *name;
  71         unsigned int namelen;
  72         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
  73         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
  74         int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
  75         int i;
  76         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
  77         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
  78         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  79
  80         if (!fb_help_conn)
  81                 return false;
  82
  83         cmdline_mode = &fb_help_conn->cmdline_mode;
  84         if (!mode_option)
  85                 mode_option = fb_mode_option;
  86
  87         if (!mode_option) {
  88                 cmdline_mode->specified = false;
  89                 return false;
  90         }
  91
  92         name = mode_option;
  93         namelen = strlen(name);
  94         for (i = namelen-1; i >= 0; i--) {
  95                 switch (name[i]) {
  96                 case '@':
  97                         namelen = i;
  98                         if (!refresh_specified && !bpp_specified &&
  99                             !yres_specified) {
 100                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 101                                 refresh_specified = 1;
 102                                 if (cvt || rb)
 103                                         cvt = 0;
 104                         } else
 105                                 goto done;
 106                         break;
 107                 case '-':
 108                         namelen = i;
 109                         if (!bpp_specified && !yres_specified) {
 110                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 111                                 bpp_specified = 1;
 112                                 if (cvt || rb)
 113                                         cvt = 0;
 114                         } else
 115                                 goto done;
 116                         break;
 117                 case 'x':
 118                         if (!yres_specified) {
 119                                 yres = simple_strtol(&name[i+1], NULL, 10);
 120                                 yres_specified = 1;
 121                         } else
 122                                 goto done;
 123                 case '0' ... '9':
 124                         break;
 125                 case 'M':
 126                         if (!yres_specified)
 127                                 cvt = 1;
 128                         break;
 129                 case 'R':
 130                         if (!cvt)
 131                                 rb = 1;
 132                         break;
 133                 case 'm':
 134                         if (!cvt)
 135                                 margins = 1;
 136                         break;
 137                 case 'i':
 138                         if (!cvt)
 139                                 interlace = 1;
 140                         break;
 141                 case 'e':
 142                         force = DRM_FORCE_ON;
 143                         break;
 144                 case 'D':
 145                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 146                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 147                                 force = DRM_FORCE_ON;
 148                         else
 149                                 force = DRM_FORCE_ON_DIGITAL;
 150                         break;
 151                 case 'd':
 152                         force = DRM_FORCE_OFF;
 153                         break;
 154                 default:
 155                         goto done;
 156                 }
 157         }
 158         if (i < 0 && yres_specified) {
 159                 xres = simple_strtol(name, NULL, 10);
 160                 res_specified = 1;
 161         }
 162 done:
 163
 164         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 165                 drm_get_connector_name(connector), xres, yres,
 166                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 167                 "", (margins) ? " with margins" : "", (interlace) ?
 168                 " interlaced" : "");
 169
 170         if (force) {
 171                 const char *s;
 172                 switch (force) {
 173                 case DRM_FORCE_OFF: s = "OFF"; break;
 174                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 175                 default:
 176                 case DRM_FORCE_ON: s = "ON"; break;
 177                 }
 178
 179                 DRM_INFO("forcing %s connector %s\n",
 180                          drm_get_connector_name(connector), s);
 181                 connector->force = force;
 182         }
 183
 184         if (res_specified) {
 185                 cmdline_mode->specified = true;
 186                 cmdline_mode->xres = xres;
 187                 cmdline_mode->yres = yres;
 188         }
 189
 190         if (refresh_specified) {
 191                 cmdline_mode->refresh_specified = true;
 192                 cmdline_mode->refresh = refresh;
 193         }
 194
 195         if (bpp_specified) {
 196                 cmdline_mode->bpp_specified = true;
 197                 cmdline_mode->bpp = bpp;
 198         }
 199         cmdline_mode->rb = rb ? true : false;
 200         cmdline_mode->cvt = cvt  ? true : false;
 201         cmdline_mode->interlace = interlace ? true : false;
 202
 203         return true;
 204 }
 205
 206 int drm_fb_helper_parse_command_line(struct drm_device *dev)
 207 {
 208         struct drm_connector *connector;
 209
 210         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 211                 char *option = NULL;
 212
 213                 /* do something on return - turn off connector maybe */
 214                 if (fb_get_options(drm_get_connector_name(connector), &option))
 215                         continue;
 216
 217                 drm_fb_helper_connector_parse_command_line(connector, option);
 218         }
 219         return 0;
 220 }
 221
 222 bool drm_fb_helper_force_kernel_mode(void)
 223 {
 224         int i = 0;
 225         bool ret, error = false;
 226         struct drm_fb_helper *helper;
 227
 228         if (list_empty(&kernel_fb_helper_list))
 229                 return false;
 230
 231         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 232                 for (i = 0; i < helper->crtc_count; i++) {
 233                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 234                         ret = drm_crtc_helper_set_config(mode_set);
 235                         if (ret)
 236                                 error = true;
 237                 }
 238         }
 239         return error;
 240 }
 241
 242 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 243                         void *panic_str)
 244 {
 245         DRM_ERROR("panic occurred, switching back to text console\n");
 246         return drm_fb_helper_force_kernel_mode();
 247         return 0;
 248 }
 249 EXPORT_SYMBOL(drm_fb_helper_panic);
 250
 251 static struct notifier_block paniced = {
 252         .notifier_call = drm_fb_helper_panic,
 253 };
 254
 255 /**
 256  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 257  *
 258  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 259  */
 260 void drm_fb_helper_restore(void)
 261 {
 262         bool ret;
 263         ret = drm_fb_helper_force_kernel_mode();
 264         if (ret == true)
 265                 DRM_ERROR("Failed to restore crtc configuration\n");
 266 }
 267 EXPORT_SYMBOL(drm_fb_helper_restore);
 268
 269 #ifdef CONFIG_MAGIC_SYSRQ
 270 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 271 {
 272         drm_fb_helper_restore();
 273 }
 274 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 275
 276 static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
 277 {
 278         schedule_work(&drm_fb_helper_restore_work);
 279 }
 280
 281 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 282         .handler = drm_fb_helper_sysrq,
 283         .help_msg = "force-fb(V)",
 284         .action_msg = "Restore framebuffer console",
 285 };
 286 #else
 287 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 288 #endif
 289
 290 static void drm_fb_helper_on(struct fb_info *info)
 291 {
 292         struct drm_fb_helper *fb_helper = info->par;
 293         struct drm_device *dev = fb_helper->dev;
 294         struct drm_crtc *crtc;
 295         struct drm_encoder *encoder;
 296         int i;
 297
 298         /*
 299          * For each CRTC in this fb, turn the crtc on then,
 300          * find all associated encoders and turn them on.
 301          */
 302         for (i = 0; i < fb_helper->crtc_count; i++) {
 303                 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 304                         struct drm_crtc_helper_funcs *crtc_funcs =
 305                                 crtc->helper_private;
 306
 307                         /* Only mess with CRTCs in this fb */
 308                         if (crtc->base.id != fb_helper->crtc_info[i].crtc_id ||
 309                             !crtc->enabled)
 310                                 continue;
 311
 312                         mutex_lock(&dev->mode_config.mutex);
 313                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 314                         mutex_unlock(&dev->mode_config.mutex);
 315
 316                         /* Found a CRTC on this fb, now find encoders */
 317                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 318                                 if (encoder->crtc == crtc) {
 319                                         struct drm_encoder_helper_funcs *encoder_funcs;
 320
 321                                         encoder_funcs = encoder->helper_private;
 322                                         mutex_lock(&dev->mode_config.mutex);
 323                                         encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 324                                         mutex_unlock(&dev->mode_config.mutex);
 325                                 }
 326                         }
 327                 }
 328         }
 329 }
 330
 331 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 332 {
 333         struct drm_fb_helper *fb_helper = info->par;
 334         struct drm_device *dev = fb_helper->dev;
 335         struct drm_crtc *crtc;
 336         struct drm_encoder *encoder;
 337         int i;
 338
 339         /*
 340          * For each CRTC in this fb, find all associated encoders
 341          * and turn them off, then turn off the CRTC.
 342          */
 343         for (i = 0; i < fb_helper->crtc_count; i++) {
 344                 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 345                         struct drm_crtc_helper_funcs *crtc_funcs =
 346                                 crtc->helper_private;
 347
 348                         /* Only mess with CRTCs in this fb */
 349                         if (crtc->base.id != fb_helper->crtc_info[i].crtc_id ||
 350                             !crtc->enabled)
 351                                 continue;
 352
 353                         /* Found a CRTC on this fb, now find encoders */
 354                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 355                                 if (encoder->crtc == crtc) {
 356                                         struct drm_encoder_helper_funcs *encoder_funcs;
 357
 358                                         encoder_funcs = encoder->helper_private;
 359                                         mutex_lock(&dev->mode_config.mutex);
 360                                         encoder_funcs->dpms(encoder, dpms_mode);
 361                                         mutex_unlock(&dev->mode_config.mutex);
 362                                 }
 363                         }
 364                         mutex_lock(&dev->mode_config.mutex);
 365                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 366                         mutex_unlock(&dev->mode_config.mutex);
 367                 }
 368         }
 369 }
 370
 371 int drm_fb_helper_blank(int blank, struct fb_info *info)
 372 {
 373         switch (blank) {
 374         /* Display: On; HSync: On, VSync: On */
 375         case FB_BLANK_UNBLANK:
 376                 drm_fb_helper_on(info);
 377                 break;
 378         /* Display: Off; HSync: On, VSync: On */
 379         case FB_BLANK_NORMAL:
 380                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 381                 break;
 382         /* Display: Off; HSync: Off, VSync: On */
 383         case FB_BLANK_HSYNC_SUSPEND:
 384                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 385                 break;
 386         /* Display: Off; HSync: On, VSync: Off */
 387         case FB_BLANK_VSYNC_SUSPEND:
 388                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 389                 break;
 390         /* Display: Off; HSync: Off, VSync: Off */
 391         case FB_BLANK_POWERDOWN:
 392                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 393                 break;
 394         }
 395         return 0;
 396 }
 397 EXPORT_SYMBOL(drm_fb_helper_blank);
 398
 399 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 400 {
 401         int i;
 402
 403         for (i = 0; i < helper->crtc_count; i++)
 404                 kfree(helper->crtc_info[i].mode_set.connectors);
 405         kfree(helper->crtc_info);
 406 }
 407
 408 int drm_fb_helper_init_crtc_count(struct drm_fb_helper *helper, int crtc_count, int max_conn_count)
 409 {
 410         struct drm_device *dev = helper->dev;
 411         struct drm_crtc *crtc;
 412         int ret = 0;
 413         int i;
 414
 415         helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 416         if (!helper->crtc_info)
 417                 return -ENOMEM;
 418
 419         helper->crtc_count = crtc_count;
 420
 421         for (i = 0; i < crtc_count; i++) {
 422                 helper->crtc_info[i].mode_set.connectors =
 423                         kcalloc(max_conn_count,
 424                                 sizeof(struct drm_connector *),
 425                                 GFP_KERNEL);
 426
 427                 if (!helper->crtc_info[i].mode_set.connectors) {
 428                         ret = -ENOMEM;
 429                         goto out_free;
 430                 }
 431                 helper->crtc_info[i].mode_set.num_connectors = 0;
 432         }
 433
 434         i = 0;
 435         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 436                 helper->crtc_info[i].crtc_id = crtc->base.id;
 437                 helper->crtc_info[i].mode_set.crtc = crtc;
 438                 i++;
 439         }
 440         helper->conn_limit = max_conn_count;
 441         return 0;
 442 out_free:
 443         drm_fb_helper_crtc_free(helper);
 444         return -ENOMEM;
 445 }
 446 EXPORT_SYMBOL(drm_fb_helper_init_crtc_count);
 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                 palette[regno] = value;
 469                 return 0;
 470         }
 471
 472         pindex = regno;
 473
 474         if (fb->bits_per_pixel == 16) {
 475                 pindex = regno << 3;
 476
 477                 if (fb->depth == 16 && regno > 63)
 478                         return -EINVAL;
 479                 if (fb->depth == 15 && regno > 31)
 480                         return -EINVAL;
 481
 482                 if (fb->depth == 16) {
 483                         u16 r, g, b;
 484                         int i;
 485                         if (regno < 32) {
 486                                 for (i = 0; i < 8; i++)
 487                                         fb_helper->funcs->gamma_set(crtc, red,
 488                                                 green, blue, pindex + i);
 489                         }
 490
 491                         fb_helper->funcs->gamma_get(crtc, &r,
 492                                                     &g, &b,
 493                                                     pindex >> 1);
 494
 495                         for (i = 0; i < 4; i++)
 496                                 fb_helper->funcs->gamma_set(crtc, r,
 497                                                             green, b,
 498                                                             (pindex >> 1) + i);
 499                 }
 500         }
 501
 502         if (fb->depth != 16)
 503                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 504         return 0;
 505 }
 506
 507 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 508 {
 509         struct drm_fb_helper *fb_helper = info->par;
 510         struct drm_device *dev = fb_helper->dev;
 511         u16 *red, *green, *blue, *transp;
 512         struct drm_crtc *crtc;
 513         int i, rc = 0;
 514         int start;
 515
 516         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 517                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 518                 for (i = 0; i < fb_helper->crtc_count; i++) {
 519                         if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
 520                                 break;
 521                 }
 522                 if (i == fb_helper->crtc_count)
 523                         continue;
 524
 525                 red = cmap->red;
 526                 green = cmap->green;
 527                 blue = cmap->blue;
 528                 transp = cmap->transp;
 529                 start = cmap->start;
 530
 531                 for (i = 0; i < cmap->len; i++) {
 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_setcolreg(unsigned regno,
 552                             unsigned red,
 553                             unsigned green,
 554                             unsigned blue,
 555                             unsigned transp,
 556                             struct fb_info *info)
 557 {
 558         struct drm_fb_helper *fb_helper = info->par;
 559         struct drm_device *dev = fb_helper->dev;
 560         struct drm_crtc *crtc;
 561         int i;
 562         int ret;
 563
 564         if (regno > 255)
 565                 return 1;
 566
 567         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 568                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 569                 for (i = 0; i < fb_helper->crtc_count; i++) {
 570                         if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
 571                                 break;
 572                 }
 573                 if (i == fb_helper->crtc_count)
 574                         continue;
 575
 576                 ret = setcolreg(crtc, red, green, blue, regno, info);
 577                 if (ret)
 578                         return ret;
 579
 580                 crtc_funcs->load_lut(crtc);
 581         }
 582         return 0;
 583 }
 584 EXPORT_SYMBOL(drm_fb_helper_setcolreg);
 585
 586 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 587                             struct fb_info *info)
 588 {
 589         struct drm_fb_helper *fb_helper = info->par;
 590         struct drm_framebuffer *fb = fb_helper->fb;
 591         int depth;
 592
 593         if (var->pixclock != 0)
 594                 return -EINVAL;
 595
 596         /* Need to resize the fb object !!! */
 597         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 598                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 599                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 600                           fb->width, fb->height, fb->bits_per_pixel);
 601                 return -EINVAL;
 602         }
 603
 604         switch (var->bits_per_pixel) {
 605         case 16:
 606                 depth = (var->green.length == 6) ? 16 : 15;
 607                 break;
 608         case 32:
 609                 depth = (var->transp.length > 0) ? 32 : 24;
 610                 break;
 611         default:
 612                 depth = var->bits_per_pixel;
 613                 break;
 614         }
 615
 616         switch (depth) {
 617         case 8:
 618                 var->red.offset = 0;
 619                 var->green.offset = 0;
 620                 var->blue.offset = 0;
 621                 var->red.length = 8;
 622                 var->green.length = 8;
 623                 var->blue.length = 8;
 624                 var->transp.length = 0;
 625                 var->transp.offset = 0;
 626                 break;
 627         case 15:
 628                 var->red.offset = 10;
 629                 var->green.offset = 5;
 630                 var->blue.offset = 0;
 631                 var->red.length = 5;
 632                 var->green.length = 5;
 633                 var->blue.length = 5;
 634                 var->transp.length = 1;
 635                 var->transp.offset = 15;
 636                 break;
 637         case 16:
 638                 var->red.offset = 11;
 639                 var->green.offset = 5;
 640                 var->blue.offset = 0;
 641                 var->red.length = 5;
 642                 var->green.length = 6;
 643                 var->blue.length = 5;
 644                 var->transp.length = 0;
 645                 var->transp.offset = 0;
 646                 break;
 647         case 24:
 648                 var->red.offset = 16;
 649                 var->green.offset = 8;
 650                 var->blue.offset = 0;
 651                 var->red.length = 8;
 652                 var->green.length = 8;
 653                 var->blue.length = 8;
 654                 var->transp.length = 0;
 655                 var->transp.offset = 0;
 656                 break;
 657         case 32:
 658                 var->red.offset = 16;
 659                 var->green.offset = 8;
 660                 var->blue.offset = 0;
 661                 var->red.length = 8;
 662                 var->green.length = 8;
 663                 var->blue.length = 8;
 664                 var->transp.length = 8;
 665                 var->transp.offset = 24;
 666                 break;
 667         default:
 668                 return -EINVAL;
 669         }
 670         return 0;
 671 }
 672 EXPORT_SYMBOL(drm_fb_helper_check_var);
 673
 674 /* this will let fbcon do the mode init */
 675 int drm_fb_helper_set_par(struct fb_info *info)
 676 {
 677         struct drm_fb_helper *fb_helper = info->par;
 678         struct drm_device *dev = fb_helper->dev;
 679         struct fb_var_screeninfo *var = &info->var;
 680         struct drm_crtc *crtc;
 681         int ret;
 682         int i;
 683
 684         if (var->pixclock != 0) {
 685                 DRM_ERROR("PIXEL CLOCK SET\n");
 686                 return -EINVAL;
 687         }
 688
 689         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 690
 691                 for (i = 0; i < fb_helper->crtc_count; i++) {
 692                         if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
 693                                 break;
 694                 }
 695                 if (i == fb_helper->crtc_count)
 696                         continue;
 697
 698                 if (crtc->fb == fb_helper->crtc_info[i].mode_set.fb) {
 699                         mutex_lock(&dev->mode_config.mutex);
 700                         ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 701                         mutex_unlock(&dev->mode_config.mutex);
 702                         if (ret)
 703                                 return ret;
 704                 }
 705         }
 706         return 0;
 707 }
 708 EXPORT_SYMBOL(drm_fb_helper_set_par);
 709
 710 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 711                               struct fb_info *info)
 712 {
 713         struct drm_fb_helper *fb_helper = info->par;
 714         struct drm_device *dev = fb_helper->dev;
 715         struct drm_mode_set *modeset;
 716         struct drm_crtc *crtc;
 717         int ret = 0;
 718         int i;
 719
 720         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 721                 for (i = 0; i < fb_helper->crtc_count; i++) {
 722                         if (crtc->base.id == fb_helper->crtc_info[i].crtc_id)
 723                                 break;
 724                 }
 725
 726                 if (i == fb_helper->crtc_count)
 727                         continue;
 728
 729                 modeset = &fb_helper->crtc_info[i].mode_set;
 730
 731                 modeset->x = var->xoffset;
 732                 modeset->y = var->yoffset;
 733
 734                 if (modeset->num_connectors) {
 735                         mutex_lock(&dev->mode_config.mutex);
 736                         ret = crtc->funcs->set_config(modeset);
 737                         mutex_unlock(&dev->mode_config.mutex);
 738                         if (!ret) {
 739                                 info->var.xoffset = var->xoffset;
 740                                 info->var.yoffset = var->yoffset;
 741                         }
 742                 }
 743         }
 744         return ret;
 745 }
 746 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 747
 748 int drm_fb_helper_single_fb_probe(struct drm_device *dev,
 749                                   int preferred_bpp,
 750                                   int (*fb_find_or_create)(struct drm_device *dev,
 751                                                            struct drm_fb_helper_surface_size *sizes,
 752                                                            struct drm_fb_helper **fb_ptr))
 753 {
 754         struct drm_crtc *crtc;
 755         struct drm_connector *connector;
 756         int new_fb = 0;
 757         int crtc_count = 0;
 758         int ret, i, conn_count = 0;
 759         struct fb_info *info;
 760         struct drm_mode_set *modeset = NULL;
 761         struct drm_fb_helper *fb_helper;
 762         struct drm_fb_helper_surface_size sizes;
 763
 764         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 765         sizes.surface_depth = 24;
 766         sizes.surface_bpp = 32;
 767         sizes.fb_width = (unsigned)-1;
 768         sizes.fb_height = (unsigned)-1;
 769
 770         /* if driver picks 8 or 16 by default use that
 771            for both depth/bpp */
 772         if (preferred_bpp != sizes.surface_bpp) {
 773                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 774         }
 775         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 776         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 777                 struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 778
 779                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 780
 781                 if (!fb_help_conn)
 782                         continue;
 783
 784                 cmdline_mode = &fb_help_conn->cmdline_mode;
 785
 786                 if (cmdline_mode->bpp_specified) {
 787                         switch (cmdline_mode->bpp) {
 788                         case 8:
 789                                 sizes.surface_depth = sizes.surface_bpp = 8;
 790                                 break;
 791                         case 15:
 792                                 sizes.surface_depth = 15;
 793                                 sizes.surface_bpp = 16;
 794                                 break;
 795                         case 16:
 796                                 sizes.surface_depth = sizes.surface_bpp = 16;
 797                                 break;
 798                         case 24:
 799                                 sizes.surface_depth = sizes.surface_bpp = 24;
 800                                 break;
 801                         case 32:
 802                                 sizes.surface_depth = 24;
 803                                 sizes.surface_bpp = 32;
 804                                 break;
 805                         }
 806                         break;
 807                 }
 808         }
 809
 810         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 811                 if (drm_helper_crtc_in_use(crtc)) {
 812                         if (crtc->desired_mode) {
 813                                 if (crtc->desired_mode->hdisplay < sizes.fb_width)
 814                                         sizes.fb_width = crtc->desired_mode->hdisplay;
 815
 816                                 if (crtc->desired_mode->vdisplay < sizes.fb_height)
 817                                         sizes.fb_height = crtc->desired_mode->vdisplay;
 818
 819                                 if (crtc->desired_mode->hdisplay > sizes.surface_width)
 820                                         sizes.surface_width = crtc->desired_mode->hdisplay;
 821
 822                                 if (crtc->desired_mode->vdisplay > sizes.surface_height)
 823                                         sizes.surface_height = crtc->desired_mode->vdisplay;
 824                         }
 825                         crtc_count++;
 826                 }
 827         }
 828
 829         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 830                 /* hmm everyone went away - assume VGA cable just fell out
 831                    and will come back later. */
 832                 return 0;
 833         }
 834
 835         /* push down into drivers */
 836         new_fb = (*fb_find_or_create)(dev, &sizes,
 837                                       &fb_helper);
 838         if (new_fb < 0)
 839                 return new_fb;
 840
 841         info = fb_helper->fbdev;
 842
 843         crtc_count = 0;
 844         /* okay we need to setup new connector sets in the crtcs */
 845         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 846                 modeset = &fb_helper->crtc_info[crtc_count].mode_set;
 847                 modeset->fb = fb_helper->fb;
 848                 conn_count = 0;
 849                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 850                         if (connector->encoder)
 851                                 if (connector->encoder->crtc == modeset->crtc) {
 852                                         modeset->connectors[conn_count] = connector;
 853                                         conn_count++;
 854                                         if (conn_count > fb_helper->conn_limit)
 855                                                 BUG();
 856                                 }
 857                 }
 858
 859                 for (i = conn_count; i < fb_helper->conn_limit; i++)
 860                         modeset->connectors[i] = NULL;
 861
 862                 modeset->crtc = crtc;
 863                 crtc_count++;
 864
 865                 modeset->num_connectors = conn_count;
 866                 if (modeset->crtc->desired_mode) {
 867                         if (modeset->mode)
 868                                 drm_mode_destroy(dev, modeset->mode);
 869                         modeset->mode = drm_mode_duplicate(dev,
 870                                                            modeset->crtc->desired_mode);
 871                 }
 872         }
 873         fb_helper->crtc_count = crtc_count;
 874
 875         if (new_fb) {
 876                 info->var.pixclock = 0;
 877                 ret = fb_alloc_cmap(&info->cmap, modeset->crtc->gamma_size, 0);
 878                 if (ret)
 879                         return ret;
 880                 if (register_framebuffer(info) < 0) {
 881                         fb_dealloc_cmap(&info->cmap);
 882                         return -EINVAL;
 883                 }
 884
 885                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 886                        info->fix.id);
 887
 888         } else {
 889                 drm_fb_helper_set_par(info);
 890         }
 891
 892         /* Switch back to kernel console on panic */
 893         /* multi card linked list maybe */
 894         if (list_empty(&kernel_fb_helper_list)) {
 895                 printk(KERN_INFO "registered panic notifier\n");
 896                 atomic_notifier_chain_register(&panic_notifier_list,
 897                                                &paniced);
 898                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 899         }
 900         if (new_fb)
 901                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 902
 903         return 0;
 904 }
 905 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 906
 907 void drm_fb_helper_free(struct drm_fb_helper *helper)
 908 {
 909         list_del(&helper->kernel_fb_list);
 910         if (list_empty(&kernel_fb_helper_list)) {
 911                 printk(KERN_INFO "unregistered panic notifier\n");
 912                 atomic_notifier_chain_unregister(&panic_notifier_list,
 913                                                  &paniced);
 914                 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 915         }
 916         drm_fb_helper_crtc_free(helper);
 917         fb_dealloc_cmap(&helper->fbdev->cmap);
 918 }
 919 EXPORT_SYMBOL(drm_fb_helper_free);
 920
 921 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 922                             uint32_t depth)
 923 {
 924         info->fix.type = FB_TYPE_PACKED_PIXELS;
 925         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 926                 FB_VISUAL_TRUECOLOR;
 927         info->fix.type_aux = 0;
 928         info->fix.xpanstep = 1; /* doing it in hw */
 929         info->fix.ypanstep = 1; /* doing it in hw */
 930         info->fix.ywrapstep = 0;
 931         info->fix.accel = FB_ACCEL_NONE;
 932         info->fix.type_aux = 0;
 933
 934         info->fix.line_length = pitch;
 935         return;
 936 }
 937 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 938
 939 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 940                             uint32_t fb_width, uint32_t fb_height)
 941 {
 942         struct drm_framebuffer *fb = fb_helper->fb;
 943         info->pseudo_palette = fb_helper->pseudo_palette;
 944         info->var.xres_virtual = fb->width;
 945         info->var.yres_virtual = fb->height;
 946         info->var.bits_per_pixel = fb->bits_per_pixel;
 947         info->var.xoffset = 0;
 948         info->var.yoffset = 0;
 949         info->var.activate = FB_ACTIVATE_NOW;
 950         info->var.height = -1;
 951         info->var.width = -1;
 952
 953         switch (fb->depth) {
 954         case 8:
 955                 info->var.red.offset = 0;
 956                 info->var.green.offset = 0;
 957                 info->var.blue.offset = 0;
 958                 info->var.red.length = 8; /* 8bit DAC */
 959                 info->var.green.length = 8;
 960                 info->var.blue.length = 8;
 961                 info->var.transp.offset = 0;
 962                 info->var.transp.length = 0;
 963                 break;
 964         case 15:
 965                 info->var.red.offset = 10;
 966                 info->var.green.offset = 5;
 967                 info->var.blue.offset = 0;
 968                 info->var.red.length = 5;
 969                 info->var.green.length = 5;
 970                 info->var.blue.length = 5;
 971                 info->var.transp.offset = 15;
 972                 info->var.transp.length = 1;
 973                 break;
 974         case 16:
 975                 info->var.red.offset = 11;
 976                 info->var.green.offset = 5;
 977                 info->var.blue.offset = 0;
 978                 info->var.red.length = 5;
 979                 info->var.green.length = 6;
 980                 info->var.blue.length = 5;
 981                 info->var.transp.offset = 0;
 982                 break;
 983         case 24:
 984                 info->var.red.offset = 16;
 985                 info->var.green.offset = 8;
 986                 info->var.blue.offset = 0;
 987                 info->var.red.length = 8;
 988                 info->var.green.length = 8;
 989                 info->var.blue.length = 8;
 990                 info->var.transp.offset = 0;
 991                 info->var.transp.length = 0;
 992                 break;
 993         case 32:
 994                 info->var.red.offset = 16;
 995                 info->var.green.offset = 8;
 996                 info->var.blue.offset = 0;
 997                 info->var.red.length = 8;
 998                 info->var.green.length = 8;
 999                 info->var.blue.length = 8;
1000                 info->var.transp.offset = 24;
1001                 info->var.transp.length = 8;
1002                 break;
1003         default:
1004                 break;
1005         }
1006
1007         info->var.xres = fb_width;
1008         info->var.yres = fb_height;
1009 }
1010 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1011
1012 static int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
1013                                             uint32_t maxY)
1014 {
1015         struct drm_connector *connector;
1016         int count = 0;
1017
1018         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1019                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1020         }
1021
1022         return count;
1023 }
1024
1025 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
1026 {
1027         struct drm_display_mode *mode;
1028
1029         list_for_each_entry(mode, &connector->modes, head) {
1030                 if (drm_mode_width(mode) > width ||
1031                     drm_mode_height(mode) > height)
1032                         continue;
1033                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1034                         return mode;
1035         }
1036         return NULL;
1037 }
1038
1039 static bool drm_has_cmdline_mode(struct drm_connector *connector)
1040 {
1041         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
1042         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1043
1044         if (!fb_help_conn)
1045                 return false;
1046
1047         cmdline_mode = &fb_help_conn->cmdline_mode;
1048         return cmdline_mode->specified;
1049 }
1050
1051 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
1052 {
1053         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
1054         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1055         struct drm_display_mode *mode = NULL;
1056
1057         if (!fb_help_conn)
1058                 return mode;
1059
1060         cmdline_mode = &fb_help_conn->cmdline_mode;
1061         if (cmdline_mode->specified == false)
1062                 return mode;
1063
1064         /* attempt to find a matching mode in the list of modes
1065          *  we have gotten so far, if not add a CVT mode that conforms
1066          */
1067         if (cmdline_mode->rb || cmdline_mode->margins)
1068                 goto create_mode;
1069
1070         list_for_each_entry(mode, &connector->modes, head) {
1071                 /* check width/height */
1072                 if (mode->hdisplay != cmdline_mode->xres ||
1073                     mode->vdisplay != cmdline_mode->yres)
1074                         continue;
1075
1076                 if (cmdline_mode->refresh_specified) {
1077                         if (mode->vrefresh != cmdline_mode->refresh)
1078                                 continue;
1079                 }
1080
1081                 if (cmdline_mode->interlace) {
1082                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1083                                 continue;
1084                 }
1085                 return mode;
1086         }
1087
1088 create_mode:
1089         mode = drm_cvt_mode(connector->dev, cmdline_mode->xres,
1090                             cmdline_mode->yres,
1091                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1092                             cmdline_mode->rb, cmdline_mode->interlace,
1093                             cmdline_mode->margins);
1094         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1095         list_add(&mode->head, &connector->modes);
1096         return mode;
1097 }
1098
1099 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1100 {
1101         bool enable;
1102
1103         if (strict) {
1104                 enable = connector->status == connector_status_connected;
1105         } else {
1106                 enable = connector->status != connector_status_disconnected;
1107         }
1108         return enable;
1109 }
1110
1111 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
1112 {
1113         bool any_enabled = false;
1114         struct drm_connector *connector;
1115         int i = 0;
1116
1117         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1118                 enabled[i] = drm_connector_enabled(connector, true);
1119                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1120                           enabled[i] ? "yes" : "no");
1121                 any_enabled |= enabled[i];
1122                 i++;
1123         }
1124
1125         if (any_enabled)
1126                 return;
1127
1128         i = 0;
1129         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1130                 enabled[i] = drm_connector_enabled(connector, false);
1131                 i++;
1132         }
1133 }
1134
1135 static bool drm_target_preferred(struct drm_device *dev,
1136                                  struct drm_display_mode **modes,
1137                                  bool *enabled, int width, int height)
1138 {
1139         struct drm_connector *connector;
1140         int i = 0;
1141
1142         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1143
1144                 if (enabled[i] == false) {
1145                         i++;
1146                         continue;
1147                 }
1148
1149                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1150                               connector->base.id);
1151
1152                 /* got for command line mode first */
1153                 modes[i] = drm_pick_cmdline_mode(connector, width, height);
1154                 if (!modes[i]) {
1155                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1156                                       connector->base.id);
1157                         modes[i] = drm_has_preferred_mode(connector, width, height);
1158                 }
1159                 /* No preferred modes, pick one off the list */
1160                 if (!modes[i] && !list_empty(&connector->modes)) {
1161                         list_for_each_entry(modes[i], &connector->modes, head)
1162                                 break;
1163                 }
1164                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1165                           "none");
1166                 i++;
1167         }
1168         return true;
1169 }
1170
1171 static int drm_pick_crtcs(struct drm_device *dev,
1172                           struct drm_crtc **best_crtcs,
1173                           struct drm_display_mode **modes,
1174                           int n, int width, int height)
1175 {
1176         int c, o;
1177         struct drm_connector *connector;
1178         struct drm_connector_helper_funcs *connector_funcs;
1179         struct drm_encoder *encoder;
1180         struct drm_crtc *best_crtc;
1181         int my_score, best_score, score;
1182         struct drm_crtc **crtcs, *crtc;
1183
1184         if (n == dev->mode_config.num_connector)
1185                 return 0;
1186         c = 0;
1187         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1188                 if (c == n)
1189                         break;
1190                 c++;
1191         }
1192
1193         best_crtcs[n] = NULL;
1194         best_crtc = NULL;
1195         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
1196         if (modes[n] == NULL)
1197                 return best_score;
1198
1199         crtcs = kmalloc(dev->mode_config.num_connector *
1200                         sizeof(struct drm_crtc *), GFP_KERNEL);
1201         if (!crtcs)
1202                 return best_score;
1203
1204         my_score = 1;
1205         if (connector->status == connector_status_connected)
1206                 my_score++;
1207         if (drm_has_cmdline_mode(connector))
1208                 my_score++;
1209         if (drm_has_preferred_mode(connector, width, height))
1210                 my_score++;
1211
1212         connector_funcs = connector->helper_private;
1213         encoder = connector_funcs->best_encoder(connector);
1214         if (!encoder)
1215                 goto out;
1216
1217         connector->encoder = encoder;
1218
1219         /* select a crtc for this connector and then attempt to configure
1220            remaining connectors */
1221         c = 0;
1222         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1223
1224                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1225                         c++;
1226                         continue;
1227                 }
1228
1229                 for (o = 0; o < n; o++)
1230                         if (best_crtcs[o] == crtc)
1231                                 break;
1232
1233                 if (o < n) {
1234                         /* ignore cloning for now */
1235                         c++;
1236                         continue;
1237                 }
1238
1239                 crtcs[n] = crtc;
1240                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
1241                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
1242                                                   width, height);
1243                 if (score > best_score) {
1244                         best_crtc = crtc;
1245                         best_score = score;
1246                         memcpy(best_crtcs, crtcs,
1247                                dev->mode_config.num_connector *
1248                                sizeof(struct drm_crtc *));
1249                 }
1250                 c++;
1251         }
1252 out:
1253         kfree(crtcs);
1254         return best_score;
1255 }
1256
1257 static void drm_setup_crtcs(struct drm_device *dev)
1258 {
1259         struct drm_crtc **crtcs;
1260         struct drm_display_mode **modes;
1261         struct drm_encoder *encoder;
1262         struct drm_connector *connector;
1263         bool *enabled;
1264         int width, height;
1265         int i, ret;
1266
1267         DRM_DEBUG_KMS("\n");
1268
1269         width = dev->mode_config.max_width;
1270         height = dev->mode_config.max_height;
1271
1272         /* clean out all the encoder/crtc combos */
1273         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1274                 encoder->crtc = NULL;
1275         }
1276
1277         crtcs = kcalloc(dev->mode_config.num_connector,
1278                         sizeof(struct drm_crtc *), GFP_KERNEL);
1279         modes = kcalloc(dev->mode_config.num_connector,
1280                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1281         enabled = kcalloc(dev->mode_config.num_connector,
1282                           sizeof(bool), GFP_KERNEL);
1283
1284         drm_enable_connectors(dev, enabled);
1285
1286         ret = drm_target_preferred(dev, modes, enabled, width, height);
1287         if (!ret)
1288                 DRM_ERROR("Unable to find initial modes\n");
1289
1290         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1291
1292         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
1293
1294         i = 0;
1295         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1296                 struct drm_display_mode *mode = modes[i];
1297                 struct drm_crtc *crtc = crtcs[i];
1298
1299                 if (connector->encoder == NULL) {
1300                         i++;
1301                         continue;
1302                 }
1303
1304                 if (mode && crtc) {
1305                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1306                                   mode->name, crtc->base.id);
1307                         crtc->desired_mode = mode;
1308                         connector->encoder->crtc = crtc;
1309                 } else {
1310                         connector->encoder->crtc = NULL;
1311                         connector->encoder = NULL;
1312                 }
1313                 i++;
1314         }
1315
1316         kfree(crtcs);
1317         kfree(modes);
1318         kfree(enabled);
1319 }
1320
1321 /**
1322  * drm_helper_initial_config - setup a sane initial connector configuration
1323  * @dev: DRM device
1324  *
1325  * LOCKING:
1326  * Called at init time, must take mode config lock.
1327  *
1328  * Scan the CRTCs and connectors and try to put together an initial setup.
1329  * At the moment, this is a cloned configuration across all heads with
1330  * a new framebuffer object as the backing store.
1331  *
1332  * RETURNS:
1333  * Zero if everything went ok, nonzero otherwise.
1334  */
1335 bool drm_helper_initial_config(struct drm_device *dev)
1336 {
1337         int count = 0;
1338
1339         /* disable all the possible outputs/crtcs before entering KMS mode */
1340         drm_helper_disable_unused_functions(dev);
1341
1342         drm_fb_helper_parse_command_line(dev);
1343
1344         count = drm_helper_probe_connector_modes(dev,
1345                                                  dev->mode_config.max_width,
1346                                                  dev->mode_config.max_height);
1347
1348         /*
1349          * we shouldn't end up with no modes here.
1350          */
1351         if (count == 0)
1352                 printk(KERN_INFO "No connectors reported connected with modes\n");
1353
1354         drm_setup_crtcs(dev);
1355
1356         return 0;
1357 }
1358 EXPORT_SYMBOL(drm_helper_initial_config);
1359
1360 bool drm_helper_fb_hotplug_event(struct drm_device *dev)
1361 {
1362         DRM_DEBUG_KMS("\n");
1363
1364         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
1365                                          dev->mode_config.max_height);
1366
1367         drm_setup_crtcs(dev);
1368
1369         return true;
1370 }
1371 EXPORT_SYMBOL(drm_helper_fb_hotplug_event);