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_crtc_helper_funcs *crtc_funcs;
 296         struct drm_encoder *encoder;
 297         int i;
 298
 299         /*
 300          * For each CRTC in this fb, turn the crtc on then,
 301          * find all associated encoders and turn them on.
 302          */
 303         mutex_lock(&dev->mode_config.mutex);
 304         for (i = 0; i < fb_helper->crtc_count; i++) {
 305                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 306                 crtc_funcs = crtc->helper_private;
 307
 308                 if (!crtc->enabled)
 309                         continue;
 310
 311                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 312
 313
 314                 /* Found a CRTC on this fb, now find encoders */
 315                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 316                         if (encoder->crtc == crtc) {
 317                                 struct drm_encoder_helper_funcs *encoder_funcs;
 318
 319                                 encoder_funcs = encoder->helper_private;
 320                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 321                         }
 322                 }
 323         }
 324         mutex_unlock(&dev->mode_config.mutex);
 325 }
 326
 327 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 328 {
 329         struct drm_fb_helper *fb_helper = info->par;
 330         struct drm_device *dev = fb_helper->dev;
 331         struct drm_crtc *crtc;
 332         struct drm_crtc_helper_funcs *crtc_funcs;
 333         struct drm_encoder *encoder;
 334         int i;
 335
 336         /*
 337          * For each CRTC in this fb, find all associated encoders
 338          * and turn them off, then turn off the CRTC.
 339          */
 340         mutex_lock(&dev->mode_config.mutex);
 341         for (i = 0; i < fb_helper->crtc_count; i++) {
 342                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 343                 crtc_funcs = crtc->helper_private;
 344
 345                 if (!crtc->enabled)
 346                         continue;
 347
 348                 /* Found a CRTC on this fb, now find encoders */
 349                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 350                         if (encoder->crtc == crtc) {
 351                                 struct drm_encoder_helper_funcs *encoder_funcs;
 352
 353                                 encoder_funcs = encoder->helper_private;
 354                                 encoder_funcs->dpms(encoder, dpms_mode);
 355                         }
 356                 }
 357                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 358         }
 359         mutex_unlock(&dev->mode_config.mutex);
 360 }
 361
 362 int drm_fb_helper_blank(int blank, struct fb_info *info)
 363 {
 364         switch (blank) {
 365         /* Display: On; HSync: On, VSync: On */
 366         case FB_BLANK_UNBLANK:
 367                 drm_fb_helper_on(info);
 368                 break;
 369         /* Display: Off; HSync: On, VSync: On */
 370         case FB_BLANK_NORMAL:
 371                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 372                 break;
 373         /* Display: Off; HSync: Off, VSync: On */
 374         case FB_BLANK_HSYNC_SUSPEND:
 375                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 376                 break;
 377         /* Display: Off; HSync: On, VSync: Off */
 378         case FB_BLANK_VSYNC_SUSPEND:
 379                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 380                 break;
 381         /* Display: Off; HSync: Off, VSync: Off */
 382         case FB_BLANK_POWERDOWN:
 383                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 384                 break;
 385         }
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(drm_fb_helper_blank);
 389
 390 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 391 {
 392         int i;
 393
 394         for (i = 0; i < helper->crtc_count; i++)
 395                 kfree(helper->crtc_info[i].mode_set.connectors);
 396         kfree(helper->crtc_info);
 397 }
 398
 399 int drm_fb_helper_init_crtc_count(struct drm_device *dev,
 400                                   struct drm_fb_helper *helper,
 401                                   int crtc_count, int max_conn_count)
 402 {
 403         struct drm_crtc *crtc;
 404         int ret = 0;
 405         int i;
 406
 407         INIT_LIST_HEAD(&helper->kernel_fb_list);
 408         helper->dev = dev;
 409         helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 410         if (!helper->crtc_info)
 411                 return -ENOMEM;
 412         helper->crtc_count = crtc_count;
 413
 414         for (i = 0; i < crtc_count; i++) {
 415                 helper->crtc_info[i].mode_set.connectors =
 416                         kcalloc(max_conn_count,
 417                                 sizeof(struct drm_connector *),
 418                                 GFP_KERNEL);
 419
 420                 if (!helper->crtc_info[i].mode_set.connectors) {
 421                         ret = -ENOMEM;
 422                         goto out_free;
 423                 }
 424                 helper->crtc_info[i].mode_set.num_connectors = 0;
 425         }
 426
 427         i = 0;
 428         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 429                 helper->crtc_info[i].crtc_id = crtc->base.id;
 430                 helper->crtc_info[i].mode_set.crtc = crtc;
 431                 i++;
 432         }
 433         helper->conn_limit = max_conn_count;
 434         return 0;
 435 out_free:
 436         drm_fb_helper_crtc_free(helper);
 437         return -ENOMEM;
 438 }
 439 EXPORT_SYMBOL(drm_fb_helper_init_crtc_count);
 440
 441 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 442                      u16 blue, u16 regno, struct fb_info *info)
 443 {
 444         struct drm_fb_helper *fb_helper = info->par;
 445         struct drm_framebuffer *fb = fb_helper->fb;
 446         int pindex;
 447
 448         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 449                 u32 *palette;
 450                 u32 value;
 451                 /* place color in psuedopalette */
 452                 if (regno > 16)
 453                         return -EINVAL;
 454                 palette = (u32 *)info->pseudo_palette;
 455                 red >>= (16 - info->var.red.length);
 456                 green >>= (16 - info->var.green.length);
 457                 blue >>= (16 - info->var.blue.length);
 458                 value = (red << info->var.red.offset) |
 459                         (green << info->var.green.offset) |
 460                         (blue << info->var.blue.offset);
 461                 palette[regno] = value;
 462                 return 0;
 463         }
 464
 465         pindex = regno;
 466
 467         if (fb->bits_per_pixel == 16) {
 468                 pindex = regno << 3;
 469
 470                 if (fb->depth == 16 && regno > 63)
 471                         return -EINVAL;
 472                 if (fb->depth == 15 && regno > 31)
 473                         return -EINVAL;
 474
 475                 if (fb->depth == 16) {
 476                         u16 r, g, b;
 477                         int i;
 478                         if (regno < 32) {
 479                                 for (i = 0; i < 8; i++)
 480                                         fb_helper->funcs->gamma_set(crtc, red,
 481                                                 green, blue, pindex + i);
 482                         }
 483
 484                         fb_helper->funcs->gamma_get(crtc, &r,
 485                                                     &g, &b,
 486                                                     pindex >> 1);
 487
 488                         for (i = 0; i < 4; i++)
 489                                 fb_helper->funcs->gamma_set(crtc, r,
 490                                                             green, b,
 491                                                             (pindex >> 1) + i);
 492                 }
 493         }
 494
 495         if (fb->depth != 16)
 496                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 497         return 0;
 498 }
 499
 500 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 501 {
 502         struct drm_fb_helper *fb_helper = info->par;
 503         struct drm_crtc_helper_funcs *crtc_funcs;
 504         u16 *red, *green, *blue, *transp;
 505         struct drm_crtc *crtc;
 506         int i, rc = 0;
 507         int start;
 508
 509         for (i = 0; i < fb_helper->crtc_count; i++) {
 510                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 511                 crtc_funcs = crtc->helper_private;
 512
 513                 red = cmap->red;
 514                 green = cmap->green;
 515                 blue = cmap->blue;
 516                 transp = cmap->transp;
 517                 start = cmap->start;
 518
 519                 for (i = 0; i < cmap->len; i++) {
 520                         u16 hred, hgreen, hblue, htransp = 0xffff;
 521
 522                         hred = *red++;
 523                         hgreen = *green++;
 524                         hblue = *blue++;
 525
 526                         if (transp)
 527                                 htransp = *transp++;
 528
 529                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 530                         if (rc)
 531                                 return rc;
 532                 }
 533                 crtc_funcs->load_lut(crtc);
 534         }
 535         return rc;
 536 }
 537 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 538
 539 int drm_fb_helper_setcolreg(unsigned regno,
 540                             unsigned red,
 541                             unsigned green,
 542                             unsigned blue,
 543                             unsigned transp,
 544                             struct fb_info *info)
 545 {
 546         struct drm_fb_helper *fb_helper = info->par;
 547         struct drm_crtc *crtc;
 548         struct drm_crtc_helper_funcs *crtc_funcs;
 549         int i;
 550         int ret;
 551
 552         if (regno > 255)
 553                 return 1;
 554
 555         for (i = 0; i < fb_helper->crtc_count; i++) {
 556                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 557                 crtc_funcs = crtc->helper_private;
 558
 559                 ret = setcolreg(crtc, red, green, blue, regno, info);
 560                 if (ret)
 561                         return ret;
 562
 563                 crtc_funcs->load_lut(crtc);
 564         }
 565         return 0;
 566 }
 567 EXPORT_SYMBOL(drm_fb_helper_setcolreg);
 568
 569 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 570                             struct fb_info *info)
 571 {
 572         struct drm_fb_helper *fb_helper = info->par;
 573         struct drm_framebuffer *fb = fb_helper->fb;
 574         int depth;
 575
 576         if (var->pixclock != 0)
 577                 return -EINVAL;
 578
 579         /* Need to resize the fb object !!! */
 580         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 581                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 582                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 583                           fb->width, fb->height, fb->bits_per_pixel);
 584                 return -EINVAL;
 585         }
 586
 587         switch (var->bits_per_pixel) {
 588         case 16:
 589                 depth = (var->green.length == 6) ? 16 : 15;
 590                 break;
 591         case 32:
 592                 depth = (var->transp.length > 0) ? 32 : 24;
 593                 break;
 594         default:
 595                 depth = var->bits_per_pixel;
 596                 break;
 597         }
 598
 599         switch (depth) {
 600         case 8:
 601                 var->red.offset = 0;
 602                 var->green.offset = 0;
 603                 var->blue.offset = 0;
 604                 var->red.length = 8;
 605                 var->green.length = 8;
 606                 var->blue.length = 8;
 607                 var->transp.length = 0;
 608                 var->transp.offset = 0;
 609                 break;
 610         case 15:
 611                 var->red.offset = 10;
 612                 var->green.offset = 5;
 613                 var->blue.offset = 0;
 614                 var->red.length = 5;
 615                 var->green.length = 5;
 616                 var->blue.length = 5;
 617                 var->transp.length = 1;
 618                 var->transp.offset = 15;
 619                 break;
 620         case 16:
 621                 var->red.offset = 11;
 622                 var->green.offset = 5;
 623                 var->blue.offset = 0;
 624                 var->red.length = 5;
 625                 var->green.length = 6;
 626                 var->blue.length = 5;
 627                 var->transp.length = 0;
 628                 var->transp.offset = 0;
 629                 break;
 630         case 24:
 631                 var->red.offset = 16;
 632                 var->green.offset = 8;
 633                 var->blue.offset = 0;
 634                 var->red.length = 8;
 635                 var->green.length = 8;
 636                 var->blue.length = 8;
 637                 var->transp.length = 0;
 638                 var->transp.offset = 0;
 639                 break;
 640         case 32:
 641                 var->red.offset = 16;
 642                 var->green.offset = 8;
 643                 var->blue.offset = 0;
 644                 var->red.length = 8;
 645                 var->green.length = 8;
 646                 var->blue.length = 8;
 647                 var->transp.length = 8;
 648                 var->transp.offset = 24;
 649                 break;
 650         default:
 651                 return -EINVAL;
 652         }
 653         return 0;
 654 }
 655 EXPORT_SYMBOL(drm_fb_helper_check_var);
 656
 657 /* this will let fbcon do the mode init */
 658 int drm_fb_helper_set_par(struct fb_info *info)
 659 {
 660         struct drm_fb_helper *fb_helper = info->par;
 661         struct drm_device *dev = fb_helper->dev;
 662         struct fb_var_screeninfo *var = &info->var;
 663         struct drm_crtc *crtc;
 664         int ret;
 665         int i;
 666
 667         if (var->pixclock != 0) {
 668                 DRM_ERROR("PIXEL CLOCK SET\n");
 669                 return -EINVAL;
 670         }
 671
 672         mutex_lock(&dev->mode_config.mutex);
 673         for (i = 0; i < fb_helper->crtc_count; i++) {
 674                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 675
 676                 if (crtc->fb != fb_helper->crtc_info[i].mode_set.fb) {
 677                         ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 678
 679                         if (ret) {
 680                                 mutex_unlock(&dev->mode_config.mutex);
 681                                 return ret;
 682                         }
 683                 }
 684         }
 685         mutex_unlock(&dev->mode_config.mutex);
 686         return 0;
 687 }
 688 EXPORT_SYMBOL(drm_fb_helper_set_par);
 689
 690 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 691                               struct fb_info *info)
 692 {
 693         struct drm_fb_helper *fb_helper = info->par;
 694         struct drm_device *dev = fb_helper->dev;
 695         struct drm_mode_set *modeset;
 696         struct drm_crtc *crtc;
 697         int ret = 0;
 698         int i;
 699
 700         mutex_lock(&dev->mode_config.mutex);
 701         for (i = 0; i < fb_helper->crtc_count; i++) {
 702                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 703
 704                 modeset = &fb_helper->crtc_info[i].mode_set;
 705
 706                 modeset->x = var->xoffset;
 707                 modeset->y = var->yoffset;
 708
 709                 if (modeset->num_connectors) {
 710                         ret = crtc->funcs->set_config(modeset);
 711                         if (!ret) {
 712                                 info->var.xoffset = var->xoffset;
 713                                 info->var.yoffset = var->yoffset;
 714                         }
 715                 }
 716         }
 717         mutex_unlock(&dev->mode_config.mutex);
 718         return ret;
 719 }
 720 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 721
 722 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 723                                   int preferred_bpp)
 724 {
 725         struct drm_device *dev = fb_helper->dev;
 726         struct drm_connector *connector;
 727         int new_fb = 0;
 728         int crtc_count = 0;
 729         int ret, i;
 730         struct fb_info *info;
 731         struct drm_fb_helper_surface_size sizes;
 732         int gamma_size = 0;
 733
 734         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 735         sizes.surface_depth = 24;
 736         sizes.surface_bpp = 32;
 737         sizes.fb_width = (unsigned)-1;
 738         sizes.fb_height = (unsigned)-1;
 739
 740         /* if driver picks 8 or 16 by default use that
 741            for both depth/bpp */
 742         if (preferred_bpp != sizes.surface_bpp) {
 743                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 744         }
 745         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 746         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 747                 struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 748                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 749
 750                 if (!fb_help_conn)
 751                         continue;
 752
 753                 cmdline_mode = &fb_help_conn->cmdline_mode;
 754
 755                 if (cmdline_mode->bpp_specified) {
 756                         switch (cmdline_mode->bpp) {
 757                         case 8:
 758                                 sizes.surface_depth = sizes.surface_bpp = 8;
 759                                 break;
 760                         case 15:
 761                                 sizes.surface_depth = 15;
 762                                 sizes.surface_bpp = 16;
 763                                 break;
 764                         case 16:
 765                                 sizes.surface_depth = sizes.surface_bpp = 16;
 766                                 break;
 767                         case 24:
 768                                 sizes.surface_depth = sizes.surface_bpp = 24;
 769                                 break;
 770                         case 32:
 771                                 sizes.surface_depth = 24;
 772                                 sizes.surface_bpp = 32;
 773                                 break;
 774                         }
 775                         break;
 776                 }
 777         }
 778
 779         crtc_count = 0;
 780         for (i = 0; i < fb_helper->crtc_count; i++) {
 781                 struct drm_display_mode *desired_mode;
 782                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 783
 784                 if (desired_mode) {
 785                         if (gamma_size == 0)
 786                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 787                         if (desired_mode->hdisplay < sizes.fb_width)
 788                                 sizes.fb_width = desired_mode->hdisplay;
 789                         if (desired_mode->vdisplay < sizes.fb_height)
 790                                 sizes.fb_height = desired_mode->vdisplay;
 791                         if (desired_mode->hdisplay > sizes.surface_width)
 792                                 sizes.surface_width = desired_mode->hdisplay;
 793                         if (desired_mode->vdisplay > sizes.surface_height)
 794                                 sizes.surface_height = desired_mode->vdisplay;
 795                         crtc_count++;
 796                 }
 797         }
 798
 799         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 800                 /* hmm everyone went away - assume VGA cable just fell out
 801                    and will come back later. */
 802                 return 0;
 803         }
 804
 805         /* push down into drivers */
 806         new_fb = (*fb_helper->fb_probe)(fb_helper, &sizes);
 807         if (new_fb < 0)
 808                 return new_fb;
 809
 810         info = fb_helper->fbdev;
 811
 812         /* set the fb pointer */
 813         for (i = 0; i < fb_helper->crtc_count; i++) {
 814                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 815         }
 816
 817         if (new_fb) {
 818                 info->var.pixclock = 0;
 819                 ret = fb_alloc_cmap(&info->cmap, gamma_size, 0);
 820                 if (ret)
 821                         return ret;
 822                 if (register_framebuffer(info) < 0) {
 823                         fb_dealloc_cmap(&info->cmap);
 824                         return -EINVAL;
 825                 }
 826
 827                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 828                        info->fix.id);
 829
 830         } else {
 831                 drm_fb_helper_set_par(info);
 832         }
 833
 834         /* Switch back to kernel console on panic */
 835         /* multi card linked list maybe */
 836         if (list_empty(&kernel_fb_helper_list)) {
 837                 printk(KERN_INFO "registered panic notifier\n");
 838                 atomic_notifier_chain_register(&panic_notifier_list,
 839                                                &paniced);
 840                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 841         }
 842         if (new_fb)
 843                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 844
 845         return 0;
 846 }
 847 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 848
 849 void drm_fb_helper_free(struct drm_fb_helper *helper)
 850 {
 851         if (!list_empty(&helper->kernel_fb_list)) {
 852                 list_del(&helper->kernel_fb_list);
 853                 if (list_empty(&kernel_fb_helper_list)) {
 854                         printk(KERN_INFO "unregistered panic notifier\n");
 855                         atomic_notifier_chain_unregister(&panic_notifier_list,
 856                                                          &paniced);
 857                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 858                 }
 859         }
 860         drm_fb_helper_crtc_free(helper);
 861         if (helper->fbdev->cmap.len)
 862                 fb_dealloc_cmap(&helper->fbdev->cmap);
 863 }
 864 EXPORT_SYMBOL(drm_fb_helper_free);
 865
 866 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 867                             uint32_t depth)
 868 {
 869         info->fix.type = FB_TYPE_PACKED_PIXELS;
 870         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 871                 FB_VISUAL_TRUECOLOR;
 872         info->fix.type_aux = 0;
 873         info->fix.xpanstep = 1; /* doing it in hw */
 874         info->fix.ypanstep = 1; /* doing it in hw */
 875         info->fix.ywrapstep = 0;
 876         info->fix.accel = FB_ACCEL_NONE;
 877         info->fix.type_aux = 0;
 878
 879         info->fix.line_length = pitch;
 880         return;
 881 }
 882 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 883
 884 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 885                             uint32_t fb_width, uint32_t fb_height)
 886 {
 887         struct drm_framebuffer *fb = fb_helper->fb;
 888         info->pseudo_palette = fb_helper->pseudo_palette;
 889         info->var.xres_virtual = fb->width;
 890         info->var.yres_virtual = fb->height;
 891         info->var.bits_per_pixel = fb->bits_per_pixel;
 892         info->var.xoffset = 0;
 893         info->var.yoffset = 0;
 894         info->var.activate = FB_ACTIVATE_NOW;
 895         info->var.height = -1;
 896         info->var.width = -1;
 897
 898         switch (fb->depth) {
 899         case 8:
 900                 info->var.red.offset = 0;
 901                 info->var.green.offset = 0;
 902                 info->var.blue.offset = 0;
 903                 info->var.red.length = 8; /* 8bit DAC */
 904                 info->var.green.length = 8;
 905                 info->var.blue.length = 8;
 906                 info->var.transp.offset = 0;
 907                 info->var.transp.length = 0;
 908                 break;
 909         case 15:
 910                 info->var.red.offset = 10;
 911                 info->var.green.offset = 5;
 912                 info->var.blue.offset = 0;
 913                 info->var.red.length = 5;
 914                 info->var.green.length = 5;
 915                 info->var.blue.length = 5;
 916                 info->var.transp.offset = 15;
 917                 info->var.transp.length = 1;
 918                 break;
 919         case 16:
 920                 info->var.red.offset = 11;
 921                 info->var.green.offset = 5;
 922                 info->var.blue.offset = 0;
 923                 info->var.red.length = 5;
 924                 info->var.green.length = 6;
 925                 info->var.blue.length = 5;
 926                 info->var.transp.offset = 0;
 927                 break;
 928         case 24:
 929                 info->var.red.offset = 16;
 930                 info->var.green.offset = 8;
 931                 info->var.blue.offset = 0;
 932                 info->var.red.length = 8;
 933                 info->var.green.length = 8;
 934                 info->var.blue.length = 8;
 935                 info->var.transp.offset = 0;
 936                 info->var.transp.length = 0;
 937                 break;
 938         case 32:
 939                 info->var.red.offset = 16;
 940                 info->var.green.offset = 8;
 941                 info->var.blue.offset = 0;
 942                 info->var.red.length = 8;
 943                 info->var.green.length = 8;
 944                 info->var.blue.length = 8;
 945                 info->var.transp.offset = 24;
 946                 info->var.transp.length = 8;
 947                 break;
 948         default:
 949                 break;
 950         }
 951
 952         info->var.xres = fb_width;
 953         info->var.yres = fb_height;
 954 }
 955 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 956
 957 static int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
 958                                             uint32_t maxY)
 959 {
 960         struct drm_connector *connector;
 961         int count = 0;
 962
 963         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 964                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 965         }
 966
 967         return count;
 968 }
 969
 970 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
 971 {
 972         struct drm_display_mode *mode;
 973
 974         list_for_each_entry(mode, &connector->modes, head) {
 975                 if (drm_mode_width(mode) > width ||
 976                     drm_mode_height(mode) > height)
 977                         continue;
 978                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 979                         return mode;
 980         }
 981         return NULL;
 982 }
 983
 984 static bool drm_has_cmdline_mode(struct drm_connector *connector)
 985 {
 986         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 987         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 988
 989         if (!fb_help_conn)
 990                 return false;
 991
 992         cmdline_mode = &fb_help_conn->cmdline_mode;
 993         return cmdline_mode->specified;
 994 }
 995
 996 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
 997 {
 998         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
 999         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1000         struct drm_display_mode *mode = NULL;
1001
1002         if (!fb_help_conn)
1003                 return mode;
1004
1005         cmdline_mode = &fb_help_conn->cmdline_mode;
1006         if (cmdline_mode->specified == false)
1007                 return mode;
1008
1009         /* attempt to find a matching mode in the list of modes
1010          *  we have gotten so far, if not add a CVT mode that conforms
1011          */
1012         if (cmdline_mode->rb || cmdline_mode->margins)
1013                 goto create_mode;
1014
1015         list_for_each_entry(mode, &connector->modes, head) {
1016                 /* check width/height */
1017                 if (mode->hdisplay != cmdline_mode->xres ||
1018                     mode->vdisplay != cmdline_mode->yres)
1019                         continue;
1020
1021                 if (cmdline_mode->refresh_specified) {
1022                         if (mode->vrefresh != cmdline_mode->refresh)
1023                                 continue;
1024                 }
1025
1026                 if (cmdline_mode->interlace) {
1027                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1028                                 continue;
1029                 }
1030                 return mode;
1031         }
1032
1033 create_mode:
1034         mode = drm_cvt_mode(connector->dev, cmdline_mode->xres,
1035                             cmdline_mode->yres,
1036                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1037                             cmdline_mode->rb, cmdline_mode->interlace,
1038                             cmdline_mode->margins);
1039         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1040         list_add(&mode->head, &connector->modes);
1041         return mode;
1042 }
1043
1044 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1045 {
1046         bool enable;
1047
1048         if (strict) {
1049                 enable = connector->status == connector_status_connected;
1050         } else {
1051                 enable = connector->status != connector_status_disconnected;
1052         }
1053         return enable;
1054 }
1055
1056 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
1057 {
1058         bool any_enabled = false;
1059         struct drm_connector *connector;
1060         int i = 0;
1061
1062         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1063                 enabled[i] = drm_connector_enabled(connector, true);
1064                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1065                           enabled[i] ? "yes" : "no");
1066                 any_enabled |= enabled[i];
1067                 i++;
1068         }
1069
1070         if (any_enabled)
1071                 return;
1072
1073         i = 0;
1074         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1075                 enabled[i] = drm_connector_enabled(connector, false);
1076                 i++;
1077         }
1078 }
1079
1080 static bool drm_target_preferred(struct drm_device *dev,
1081                                  struct drm_display_mode **modes,
1082                                  bool *enabled, int width, int height)
1083 {
1084         struct drm_connector *connector;
1085         int i = 0;
1086
1087         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1088
1089                 if (enabled[i] == false) {
1090                         i++;
1091                         continue;
1092                 }
1093
1094                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1095                               connector->base.id);
1096
1097                 /* got for command line mode first */
1098                 modes[i] = drm_pick_cmdline_mode(connector, width, height);
1099                 if (!modes[i]) {
1100                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1101                                       connector->base.id);
1102                         modes[i] = drm_has_preferred_mode(connector, width, height);
1103                 }
1104                 /* No preferred modes, pick one off the list */
1105                 if (!modes[i] && !list_empty(&connector->modes)) {
1106                         list_for_each_entry(modes[i], &connector->modes, head)
1107                                 break;
1108                 }
1109                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1110                           "none");
1111                 i++;
1112         }
1113         return true;
1114 }
1115
1116 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1117                           struct drm_fb_helper_crtc **best_crtcs,
1118                           struct drm_display_mode **modes,
1119                           int n, int width, int height)
1120 {
1121         int c, o;
1122         struct drm_device *dev = fb_helper->dev;
1123         struct drm_connector *connector;
1124         struct drm_connector_helper_funcs *connector_funcs;
1125         struct drm_encoder *encoder;
1126         struct drm_fb_helper_crtc *best_crtc;
1127         int my_score, best_score, score;
1128         struct drm_fb_helper_crtc **crtcs, *crtc;
1129
1130         if (n == fb_helper->dev->mode_config.num_connector)
1131                 return 0;
1132         c = 0;
1133         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1134                 if (c == n)
1135                         break;
1136                 c++;
1137         }
1138
1139         best_crtcs[n] = NULL;
1140         best_crtc = NULL;
1141         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1142         if (modes[n] == NULL)
1143                 return best_score;
1144
1145         crtcs = kzalloc(dev->mode_config.num_connector *
1146                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1147         if (!crtcs)
1148                 return best_score;
1149
1150         my_score = 1;
1151         if (connector->status == connector_status_connected)
1152                 my_score++;
1153         if (drm_has_cmdline_mode(connector))
1154                 my_score++;
1155         if (drm_has_preferred_mode(connector, width, height))
1156                 my_score++;
1157
1158         connector_funcs = connector->helper_private;
1159         encoder = connector_funcs->best_encoder(connector);
1160         if (!encoder)
1161                 goto out;
1162
1163         /* select a crtc for this connector and then attempt to configure
1164            remaining connectors */
1165         for (c = 0; c < fb_helper->crtc_count; c++) {
1166                 crtc = &fb_helper->crtc_info[c];
1167
1168                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1169                         continue;
1170                 }
1171
1172                 for (o = 0; o < n; o++)
1173                         if (best_crtcs[o] == crtc)
1174                                 break;
1175
1176                 if (o < n) {
1177                         /* ignore cloning for now */
1178                         continue;
1179                 }
1180
1181                 crtcs[n] = crtc;
1182                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1183                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1184                                                   width, height);
1185                 if (score > best_score) {
1186                         best_crtc = crtc;
1187                         best_score = score;
1188                         memcpy(best_crtcs, crtcs,
1189                                dev->mode_config.num_connector *
1190                                sizeof(struct drm_fb_helper_crtc *));
1191                 }
1192         }
1193 out:
1194         kfree(crtcs);
1195         return best_score;
1196 }
1197
1198 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1199 {
1200         struct drm_device *dev = fb_helper->dev;
1201         struct drm_fb_helper_crtc **crtcs;
1202         struct drm_display_mode **modes;
1203         struct drm_encoder *encoder;
1204         struct drm_connector *connector;
1205         struct drm_mode_set *modeset;
1206         bool *enabled;
1207         int width, height;
1208         int i, ret;
1209
1210         DRM_DEBUG_KMS("\n");
1211
1212         width = dev->mode_config.max_width;
1213         height = dev->mode_config.max_height;
1214
1215         /* clean out all the encoder/crtc combos */
1216         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1217                 encoder->crtc = NULL;
1218         }
1219
1220         crtcs = kcalloc(dev->mode_config.num_connector,
1221                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1222         modes = kcalloc(dev->mode_config.num_connector,
1223                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1224         enabled = kcalloc(dev->mode_config.num_connector,
1225                           sizeof(bool), GFP_KERNEL);
1226
1227         drm_enable_connectors(dev, enabled);
1228
1229         ret = drm_target_preferred(dev, modes, enabled, width, height);
1230         if (!ret)
1231                 DRM_ERROR("Unable to find initial modes\n");
1232
1233         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1234
1235         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1236
1237         /* need to set the modesets up here for use later */
1238         /* fill out the connector<->crtc mappings into the modesets */
1239         for (i = 0; i < fb_helper->crtc_count; i++) {
1240                 modeset = &fb_helper->crtc_info[i].mode_set;
1241                 modeset->num_connectors = 0;
1242         }
1243
1244         i = 0;
1245         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1246                 struct drm_display_mode *mode = modes[i];
1247                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1248                 modeset = &fb_crtc->mode_set;
1249
1250                 if (mode && fb_crtc) {
1251                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1252                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1253                         fb_crtc->desired_mode = mode;
1254                         if (modeset->mode)
1255                                 drm_mode_destroy(dev, modeset->mode);
1256                         modeset->mode = drm_mode_duplicate(dev,
1257                                                            fb_crtc->desired_mode);
1258                         modeset->connectors[modeset->num_connectors++] = connector;
1259                 }
1260                 i++;
1261         }
1262
1263         kfree(crtcs);
1264         kfree(modes);
1265         kfree(enabled);
1266 }
1267
1268 /**
1269  * drm_helper_initial_config - setup a sane initial connector configuration
1270  * @dev: DRM device
1271  *
1272  * LOCKING:
1273  * Called at init time, must take mode config lock.
1274  *
1275  * Scan the CRTCs and connectors and try to put together an initial setup.
1276  * At the moment, this is a cloned configuration across all heads with
1277  * a new framebuffer object as the backing store.
1278  *
1279  * RETURNS:
1280  * Zero if everything went ok, nonzero otherwise.
1281  */
1282 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper)
1283 {
1284         struct drm_device *dev = fb_helper->dev;
1285         int count = 0;
1286
1287         /* disable all the possible outputs/crtcs before entering KMS mode */
1288         drm_helper_disable_unused_functions(fb_helper->dev);
1289
1290         drm_fb_helper_parse_command_line(fb_helper->dev);
1291
1292         count = drm_helper_probe_connector_modes(dev,
1293                                                  dev->mode_config.max_width,
1294                                                  dev->mode_config.max_height);
1295
1296         /*
1297          * we shouldn't end up with no modes here.
1298          */
1299         if (count == 0)
1300                 printk(KERN_INFO "No connectors reported connected with modes\n");
1301
1302         drm_setup_crtcs(fb_helper);
1303
1304         return 0;
1305 }
1306 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1307
1308 bool drm_helper_fb_hotplug_event(struct drm_fb_helper *fb_helper,
1309                                  u32 max_width, u32 max_height)
1310 {
1311         DRM_DEBUG_KMS("\n");
1312
1313         drm_helper_probe_connector_modes(fb_helper->dev, max_width,
1314                                          max_height);
1315
1316         drm_setup_crtcs(fb_helper);
1317
1318         return true;
1319 }
1320 EXPORT_SYMBOL(drm_helper_fb_hotplug_event);