drivers/gpu/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #include <linux/kernel.h>
  31 #include <linux/sysrq.h>
  32 #include <linux/slab.h>
  33 #include <linux/fb.h>
  34 #include "drmP.h"
  35 #include "drm_crtc.h"
  36 #include "drm_fb_helper.h"
  37 #include "drm_crtc_helper.h"
  38
  39 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  40 MODULE_DESCRIPTION("DRM KMS helper");
  41 MODULE_LICENSE("GPL and additional rights");
  42
  43 static LIST_HEAD(kernel_fb_helper_list);
  44
  45 static struct slow_work_ops output_status_change_ops;
  46
  47 /* simple single crtc case helper function */
  48 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  49 {
  50         struct drm_device *dev = fb_helper->dev;
  51         struct drm_connector *connector;
  52         int i;
  53
  54         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  55                 struct drm_fb_helper_connector *fb_helper_connector;
  56
  57                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  58                 if (!fb_helper_connector)
  59                         goto fail;
  60
  61                 fb_helper_connector->connector = connector;
  62                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  63         }
  64         return 0;
  65 fail:
  66         for (i = 0; i < fb_helper->connector_count; i++) {
  67                 kfree(fb_helper->connector_info[i]);
  68                 fb_helper->connector_info[i] = NULL;
  69         }
  70         fb_helper->connector_count = 0;
  71         return -ENOMEM;
  72 }
  73 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
  74
  75 /**
  76  * drm_fb_helper_connector_parse_command_line - parse command line for connector
  77  * @connector - connector to parse line for
  78  * @mode_option - per connector mode option
  79  *
  80  * This parses the connector specific then generic command lines for
  81  * modes and options to configure the connector.
  82  *
  83  * This uses the same parameters as the fb modedb.c, except for extra
  84  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
  85  *
  86  * enable/enable Digital/disable bit at the end
  87  */
  88 static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_connector *fb_helper_conn,
  89                                                        const char *mode_option)
  90 {
  91         const char *name;
  92         unsigned int namelen;
  93         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
  94         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
  95         int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
  96         int i;
  97         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
  98         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  99         struct drm_connector *connector = fb_helper_conn->connector;
 100
 101         if (!fb_helper_conn)
 102                 return false;
 103
 104         cmdline_mode = &fb_helper_conn->cmdline_mode;
 105         if (!mode_option)
 106                 mode_option = fb_mode_option;
 107
 108         if (!mode_option) {
 109                 cmdline_mode->specified = false;
 110                 return false;
 111         }
 112
 113         name = mode_option;
 114         namelen = strlen(name);
 115         for (i = namelen-1; i >= 0; i--) {
 116                 switch (name[i]) {
 117                 case '@':
 118                         namelen = i;
 119                         if (!refresh_specified && !bpp_specified &&
 120                             !yres_specified) {
 121                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 122                                 refresh_specified = 1;
 123                                 if (cvt || rb)
 124                                         cvt = 0;
 125                         } else
 126                                 goto done;
 127                         break;
 128                 case '-':
 129                         namelen = i;
 130                         if (!bpp_specified && !yres_specified) {
 131                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 132                                 bpp_specified = 1;
 133                                 if (cvt || rb)
 134                                         cvt = 0;
 135                         } else
 136                                 goto done;
 137                         break;
 138                 case 'x':
 139                         if (!yres_specified) {
 140                                 yres = simple_strtol(&name[i+1], NULL, 10);
 141                                 yres_specified = 1;
 142                         } else
 143                                 goto done;
 144                 case '0' ... '9':
 145                         break;
 146                 case 'M':
 147                         if (!yres_specified)
 148                                 cvt = 1;
 149                         break;
 150                 case 'R':
 151                         if (!cvt)
 152                                 rb = 1;
 153                         break;
 154                 case 'm':
 155                         if (!cvt)
 156                                 margins = 1;
 157                         break;
 158                 case 'i':
 159                         if (!cvt)
 160                                 interlace = 1;
 161                         break;
 162                 case 'e':
 163                         force = DRM_FORCE_ON;
 164                         break;
 165                 case 'D':
 166                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 167                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 168                                 force = DRM_FORCE_ON;
 169                         else
 170                                 force = DRM_FORCE_ON_DIGITAL;
 171                         break;
 172                 case 'd':
 173                         force = DRM_FORCE_OFF;
 174                         break;
 175                 default:
 176                         goto done;
 177                 }
 178         }
 179         if (i < 0 && yres_specified) {
 180                 xres = simple_strtol(name, NULL, 10);
 181                 res_specified = 1;
 182         }
 183 done:
 184
 185         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 186                 drm_get_connector_name(connector), xres, yres,
 187                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 188                 "", (margins) ? " with margins" : "", (interlace) ?
 189                 " interlaced" : "");
 190
 191         if (force) {
 192                 const char *s;
 193                 switch (force) {
 194                 case DRM_FORCE_OFF: s = "OFF"; break;
 195                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 196                 default:
 197                 case DRM_FORCE_ON: s = "ON"; break;
 198                 }
 199
 200                 DRM_INFO("forcing %s connector %s\n",
 201                          drm_get_connector_name(connector), s);
 202                 connector->force = force;
 203         }
 204
 205         if (res_specified) {
 206                 cmdline_mode->specified = true;
 207                 cmdline_mode->xres = xres;
 208                 cmdline_mode->yres = yres;
 209         }
 210
 211         if (refresh_specified) {
 212                 cmdline_mode->refresh_specified = true;
 213                 cmdline_mode->refresh = refresh;
 214         }
 215
 216         if (bpp_specified) {
 217                 cmdline_mode->bpp_specified = true;
 218                 cmdline_mode->bpp = bpp;
 219         }
 220         cmdline_mode->rb = rb ? true : false;
 221         cmdline_mode->cvt = cvt  ? true : false;
 222         cmdline_mode->interlace = interlace ? true : false;
 223
 224         return true;
 225 }
 226
 227 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 228 {
 229         struct drm_fb_helper_connector *fb_helper_conn;
 230         int i;
 231
 232         for (i = 0; i < fb_helper->connector_count; i++) {
 233                 char *option = NULL;
 234
 235                 fb_helper_conn = fb_helper->connector_info[i];
 236
 237                 /* do something on return - turn off connector maybe */
 238                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
 239                         continue;
 240
 241                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
 242         }
 243         return 0;
 244 }
 245
 246 bool drm_fb_helper_force_kernel_mode(void)
 247 {
 248         int i = 0;
 249         bool ret, error = false;
 250         struct drm_fb_helper *helper;
 251
 252         if (list_empty(&kernel_fb_helper_list))
 253                 return false;
 254
 255         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 256                 for (i = 0; i < helper->crtc_count; i++) {
 257                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 258                         ret = drm_crtc_helper_set_config(mode_set);
 259                         if (ret)
 260                                 error = true;
 261                 }
 262         }
 263         return error;
 264 }
 265
 266 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 267                         void *panic_str)
 268 {
 269         DRM_ERROR("panic occurred, switching back to text console\n");
 270         return drm_fb_helper_force_kernel_mode();
 271         return 0;
 272 }
 273 EXPORT_SYMBOL(drm_fb_helper_panic);
 274
 275 static struct notifier_block paniced = {
 276         .notifier_call = drm_fb_helper_panic,
 277 };
 278
 279 /**
 280  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 281  *
 282  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 283  */
 284 void drm_fb_helper_restore(void)
 285 {
 286         bool ret;
 287         ret = drm_fb_helper_force_kernel_mode();
 288         if (ret == true)
 289                 DRM_ERROR("Failed to restore crtc configuration\n");
 290 }
 291 EXPORT_SYMBOL(drm_fb_helper_restore);
 292
 293 #ifdef CONFIG_MAGIC_SYSRQ
 294 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 295 {
 296         drm_fb_helper_restore();
 297 }
 298 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 299
 300 static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
 301 {
 302         schedule_work(&drm_fb_helper_restore_work);
 303 }
 304
 305 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 306         .handler = drm_fb_helper_sysrq,
 307         .help_msg = "force-fb(V)",
 308         .action_msg = "Restore framebuffer console",
 309 };
 310 #else
 311 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 312 #endif
 313
 314 static void drm_fb_helper_on(struct fb_info *info)
 315 {
 316         struct drm_fb_helper *fb_helper = info->par;
 317         struct drm_device *dev = fb_helper->dev;
 318         struct drm_crtc *crtc;
 319         struct drm_crtc_helper_funcs *crtc_funcs;
 320         struct drm_encoder *encoder;
 321         int i;
 322
 323         /*
 324          * For each CRTC in this fb, turn the crtc on then,
 325          * find all associated encoders and turn them on.
 326          */
 327         mutex_lock(&dev->mode_config.mutex);
 328         for (i = 0; i < fb_helper->crtc_count; i++) {
 329                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 330                 crtc_funcs = crtc->helper_private;
 331
 332                 if (!crtc->enabled)
 333                         continue;
 334
 335                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 336
 337
 338                 /* Found a CRTC on this fb, now find encoders */
 339                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 340                         if (encoder->crtc == crtc) {
 341                                 struct drm_encoder_helper_funcs *encoder_funcs;
 342
 343                                 encoder_funcs = encoder->helper_private;
 344                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 345                         }
 346                 }
 347         }
 348         mutex_unlock(&dev->mode_config.mutex);
 349 }
 350
 351 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 352 {
 353         struct drm_fb_helper *fb_helper = info->par;
 354         struct drm_device *dev = fb_helper->dev;
 355         struct drm_crtc *crtc;
 356         struct drm_crtc_helper_funcs *crtc_funcs;
 357         struct drm_encoder *encoder;
 358         int i;
 359
 360         /*
 361          * For each CRTC in this fb, find all associated encoders
 362          * and turn them off, then turn off the CRTC.
 363          */
 364         mutex_lock(&dev->mode_config.mutex);
 365         for (i = 0; i < fb_helper->crtc_count; i++) {
 366                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 367                 crtc_funcs = crtc->helper_private;
 368
 369                 if (!crtc->enabled)
 370                         continue;
 371
 372                 /* Found a CRTC on this fb, now find encoders */
 373                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 374                         if (encoder->crtc == crtc) {
 375                                 struct drm_encoder_helper_funcs *encoder_funcs;
 376
 377                                 encoder_funcs = encoder->helper_private;
 378                                 encoder_funcs->dpms(encoder, dpms_mode);
 379                         }
 380                 }
 381                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 382         }
 383         mutex_unlock(&dev->mode_config.mutex);
 384 }
 385
 386 int drm_fb_helper_blank(int blank, struct fb_info *info)
 387 {
 388         switch (blank) {
 389         /* Display: On; HSync: On, VSync: On */
 390         case FB_BLANK_UNBLANK:
 391                 drm_fb_helper_on(info);
 392                 break;
 393         /* Display: Off; HSync: On, VSync: On */
 394         case FB_BLANK_NORMAL:
 395                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 396                 break;
 397         /* Display: Off; HSync: Off, VSync: On */
 398         case FB_BLANK_HSYNC_SUSPEND:
 399                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 400                 break;
 401         /* Display: Off; HSync: On, VSync: Off */
 402         case FB_BLANK_VSYNC_SUSPEND:
 403                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 404                 break;
 405         /* Display: Off; HSync: Off, VSync: Off */
 406         case FB_BLANK_POWERDOWN:
 407                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 408                 break;
 409         }
 410         return 0;
 411 }
 412 EXPORT_SYMBOL(drm_fb_helper_blank);
 413
 414 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 415 {
 416         int i;
 417
 418         for (i = 0; i < helper->connector_count; i++)
 419                 kfree(helper->connector_info[i]);
 420         kfree(helper->connector_info);
 421         for (i = 0; i < helper->crtc_count; i++)
 422                 kfree(helper->crtc_info[i].mode_set.connectors);
 423         kfree(helper->crtc_info);
 424 }
 425
 426 int drm_fb_helper_init(struct drm_device *dev,
 427                        struct drm_fb_helper *fb_helper,
 428                        int crtc_count, int max_conn_count,
 429                        bool polled)
 430 {
 431         struct drm_crtc *crtc;
 432         int ret = 0;
 433         int i;
 434
 435         fb_helper->dev = dev;
 436         fb_helper->poll_enabled = polled;
 437
 438         slow_work_register_user(THIS_MODULE);
 439         delayed_slow_work_init(&fb_helper->output_status_change_slow_work,
 440                                &output_status_change_ops);
 441
 442         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 443
 444         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 445         if (!fb_helper->crtc_info)
 446                 return -ENOMEM;
 447
 448         fb_helper->crtc_count = crtc_count;
 449         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 450         if (!fb_helper->connector_info) {
 451                 kfree(fb_helper->crtc_info);
 452                 return -ENOMEM;
 453         }
 454         fb_helper->connector_count = 0;
 455
 456         for (i = 0; i < crtc_count; i++) {
 457                 fb_helper->crtc_info[i].mode_set.connectors =
 458                         kcalloc(max_conn_count,
 459                                 sizeof(struct drm_connector *),
 460                                 GFP_KERNEL);
 461
 462                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 463                         ret = -ENOMEM;
 464                         goto out_free;
 465                 }
 466                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 467         }
 468
 469         i = 0;
 470         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 471                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 472                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 473                 i++;
 474         }
 475         fb_helper->conn_limit = max_conn_count;
 476         return 0;
 477 out_free:
 478         drm_fb_helper_crtc_free(fb_helper);
 479         return -ENOMEM;
 480 }
 481 EXPORT_SYMBOL(drm_fb_helper_init);
 482
 483 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 484 {
 485         if (!list_empty(&fb_helper->kernel_fb_list)) {
 486                 list_del(&fb_helper->kernel_fb_list);
 487                 if (list_empty(&kernel_fb_helper_list)) {
 488                         printk(KERN_INFO "unregistered panic notifier\n");
 489                         atomic_notifier_chain_unregister(&panic_notifier_list,
 490                                                          &paniced);
 491                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 492                 }
 493         }
 494
 495         drm_fb_helper_crtc_free(fb_helper);
 496
 497         delayed_slow_work_cancel(&fb_helper->output_status_change_slow_work);
 498         slow_work_unregister_user(THIS_MODULE);
 499 }
 500 EXPORT_SYMBOL(drm_fb_helper_fini);
 501
 502 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 503                      u16 blue, u16 regno, struct fb_info *info)
 504 {
 505         struct drm_fb_helper *fb_helper = info->par;
 506         struct drm_framebuffer *fb = fb_helper->fb;
 507         int pindex;
 508
 509         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 510                 u32 *palette;
 511                 u32 value;
 512                 /* place color in psuedopalette */
 513                 if (regno > 16)
 514                         return -EINVAL;
 515                 palette = (u32 *)info->pseudo_palette;
 516                 red >>= (16 - info->var.red.length);
 517                 green >>= (16 - info->var.green.length);
 518                 blue >>= (16 - info->var.blue.length);
 519                 value = (red << info->var.red.offset) |
 520                         (green << info->var.green.offset) |
 521                         (blue << info->var.blue.offset);
 522                 palette[regno] = value;
 523                 return 0;
 524         }
 525
 526         pindex = regno;
 527
 528         if (fb->bits_per_pixel == 16) {
 529                 pindex = regno << 3;
 530
 531                 if (fb->depth == 16 && regno > 63)
 532                         return -EINVAL;
 533                 if (fb->depth == 15 && regno > 31)
 534                         return -EINVAL;
 535
 536                 if (fb->depth == 16) {
 537                         u16 r, g, b;
 538                         int i;
 539                         if (regno < 32) {
 540                                 for (i = 0; i < 8; i++)
 541                                         fb_helper->funcs->gamma_set(crtc, red,
 542                                                 green, blue, pindex + i);
 543                         }
 544
 545                         fb_helper->funcs->gamma_get(crtc, &r,
 546                                                     &g, &b,
 547                                                     pindex >> 1);
 548
 549                         for (i = 0; i < 4; i++)
 550                                 fb_helper->funcs->gamma_set(crtc, r,
 551                                                             green, b,
 552                                                             (pindex >> 1) + i);
 553                 }
 554         }
 555
 556         if (fb->depth != 16)
 557                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 558         return 0;
 559 }
 560
 561 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 562 {
 563         struct drm_fb_helper *fb_helper = info->par;
 564         struct drm_crtc_helper_funcs *crtc_funcs;
 565         u16 *red, *green, *blue, *transp;
 566         struct drm_crtc *crtc;
 567         int i, rc = 0;
 568         int start;
 569
 570         for (i = 0; i < fb_helper->crtc_count; i++) {
 571                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 572                 crtc_funcs = crtc->helper_private;
 573
 574                 red = cmap->red;
 575                 green = cmap->green;
 576                 blue = cmap->blue;
 577                 transp = cmap->transp;
 578                 start = cmap->start;
 579
 580                 for (i = 0; i < cmap->len; i++) {
 581                         u16 hred, hgreen, hblue, htransp = 0xffff;
 582
 583                         hred = *red++;
 584                         hgreen = *green++;
 585                         hblue = *blue++;
 586
 587                         if (transp)
 588                                 htransp = *transp++;
 589
 590                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 591                         if (rc)
 592                                 return rc;
 593                 }
 594                 crtc_funcs->load_lut(crtc);
 595         }
 596         return rc;
 597 }
 598 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 599
 600 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 601                             struct fb_info *info)
 602 {
 603         struct drm_fb_helper *fb_helper = info->par;
 604         struct drm_framebuffer *fb = fb_helper->fb;
 605         int depth;
 606
 607         if (var->pixclock != 0)
 608                 return -EINVAL;
 609
 610         /* Need to resize the fb object !!! */
 611         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 612                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 613                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 614                           fb->width, fb->height, fb->bits_per_pixel);
 615                 return -EINVAL;
 616         }
 617
 618         switch (var->bits_per_pixel) {
 619         case 16:
 620                 depth = (var->green.length == 6) ? 16 : 15;
 621                 break;
 622         case 32:
 623                 depth = (var->transp.length > 0) ? 32 : 24;
 624                 break;
 625         default:
 626                 depth = var->bits_per_pixel;
 627                 break;
 628         }
 629
 630         switch (depth) {
 631         case 8:
 632                 var->red.offset = 0;
 633                 var->green.offset = 0;
 634                 var->blue.offset = 0;
 635                 var->red.length = 8;
 636                 var->green.length = 8;
 637                 var->blue.length = 8;
 638                 var->transp.length = 0;
 639                 var->transp.offset = 0;
 640                 break;
 641         case 15:
 642                 var->red.offset = 10;
 643                 var->green.offset = 5;
 644                 var->blue.offset = 0;
 645                 var->red.length = 5;
 646                 var->green.length = 5;
 647                 var->blue.length = 5;
 648                 var->transp.length = 1;
 649                 var->transp.offset = 15;
 650                 break;
 651         case 16:
 652                 var->red.offset = 11;
 653                 var->green.offset = 5;
 654                 var->blue.offset = 0;
 655                 var->red.length = 5;
 656                 var->green.length = 6;
 657                 var->blue.length = 5;
 658                 var->transp.length = 0;
 659                 var->transp.offset = 0;
 660                 break;
 661         case 24:
 662                 var->red.offset = 16;
 663                 var->green.offset = 8;
 664                 var->blue.offset = 0;
 665                 var->red.length = 8;
 666                 var->green.length = 8;
 667                 var->blue.length = 8;
 668                 var->transp.length = 0;
 669                 var->transp.offset = 0;
 670                 break;
 671         case 32:
 672                 var->red.offset = 16;
 673                 var->green.offset = 8;
 674                 var->blue.offset = 0;
 675                 var->red.length = 8;
 676                 var->green.length = 8;
 677                 var->blue.length = 8;
 678                 var->transp.length = 8;
 679                 var->transp.offset = 24;
 680                 break;
 681         default:
 682                 return -EINVAL;
 683         }
 684         return 0;
 685 }
 686 EXPORT_SYMBOL(drm_fb_helper_check_var);
 687
 688 /* this will let fbcon do the mode init */
 689 int drm_fb_helper_set_par(struct fb_info *info)
 690 {
 691         struct drm_fb_helper *fb_helper = info->par;
 692         struct drm_device *dev = fb_helper->dev;
 693         struct fb_var_screeninfo *var = &info->var;
 694         struct drm_crtc *crtc;
 695         int ret;
 696         int i;
 697
 698         if (var->pixclock != 0) {
 699                 DRM_ERROR("PIXEL CLOCK SET\n");
 700                 return -EINVAL;
 701         }
 702
 703         mutex_lock(&dev->mode_config.mutex);
 704         for (i = 0; i < fb_helper->crtc_count; i++) {
 705                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 706                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 707                 if (ret) {
 708                         mutex_unlock(&dev->mode_config.mutex);
 709                         return ret;
 710                 }
 711         }
 712         mutex_unlock(&dev->mode_config.mutex);
 713
 714         if (fb_helper->delayed_hotplug) {
 715                 fb_helper->delayed_hotplug = false;
 716                 delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 0);
 717         }
 718         return 0;
 719 }
 720 EXPORT_SYMBOL(drm_fb_helper_set_par);
 721
 722 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 723                               struct fb_info *info)
 724 {
 725         struct drm_fb_helper *fb_helper = info->par;
 726         struct drm_device *dev = fb_helper->dev;
 727         struct drm_mode_set *modeset;
 728         struct drm_crtc *crtc;
 729         int ret = 0;
 730         int i;
 731
 732         mutex_lock(&dev->mode_config.mutex);
 733         for (i = 0; i < fb_helper->crtc_count; i++) {
 734                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 735
 736                 modeset = &fb_helper->crtc_info[i].mode_set;
 737
 738                 modeset->x = var->xoffset;
 739                 modeset->y = var->yoffset;
 740
 741                 if (modeset->num_connectors) {
 742                         ret = crtc->funcs->set_config(modeset);
 743                         if (!ret) {
 744                                 info->var.xoffset = var->xoffset;
 745                                 info->var.yoffset = var->yoffset;
 746                         }
 747                 }
 748         }
 749         mutex_unlock(&dev->mode_config.mutex);
 750         return ret;
 751 }
 752 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 753
 754 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 755                                   int preferred_bpp)
 756 {
 757         int new_fb = 0;
 758         int crtc_count = 0;
 759         int i;
 760         struct fb_info *info;
 761         struct drm_fb_helper_surface_size sizes;
 762         int gamma_size = 0;
 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         for (i = 0; i < fb_helper->connector_count; i++) {
 777                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 778                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 779
 780                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 781
 782                 if (cmdline_mode->bpp_specified) {
 783                         switch (cmdline_mode->bpp) {
 784                         case 8:
 785                                 sizes.surface_depth = sizes.surface_bpp = 8;
 786                                 break;
 787                         case 15:
 788                                 sizes.surface_depth = 15;
 789                                 sizes.surface_bpp = 16;
 790                                 break;
 791                         case 16:
 792                                 sizes.surface_depth = sizes.surface_bpp = 16;
 793                                 break;
 794                         case 24:
 795                                 sizes.surface_depth = sizes.surface_bpp = 24;
 796                                 break;
 797                         case 32:
 798                                 sizes.surface_depth = 24;
 799                                 sizes.surface_bpp = 32;
 800                                 break;
 801                         }
 802                         break;
 803                 }
 804         }
 805
 806         crtc_count = 0;
 807         for (i = 0; i < fb_helper->crtc_count; i++) {
 808                 struct drm_display_mode *desired_mode;
 809                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 810
 811                 if (desired_mode) {
 812                         if (gamma_size == 0)
 813                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 814                         if (desired_mode->hdisplay < sizes.fb_width)
 815                                 sizes.fb_width = desired_mode->hdisplay;
 816                         if (desired_mode->vdisplay < sizes.fb_height)
 817                                 sizes.fb_height = desired_mode->vdisplay;
 818                         if (desired_mode->hdisplay > sizes.surface_width)
 819                                 sizes.surface_width = desired_mode->hdisplay;
 820                         if (desired_mode->vdisplay > sizes.surface_height)
 821                                 sizes.surface_height = desired_mode->vdisplay;
 822                         crtc_count++;
 823                 }
 824         }
 825
 826         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 827                 /* hmm everyone went away - assume VGA cable just fell out
 828                    and will come back later. */
 829                 DRM_ERROR("Cannot find any crtc or sizes - going 1024x768\n");
 830                 sizes.fb_width = sizes.surface_width = 1024;
 831                 sizes.fb_height = sizes.surface_height = 768;
 832         }
 833
 834         /* push down into drivers */
 835         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 836         if (new_fb < 0)
 837                 return new_fb;
 838
 839         info = fb_helper->fbdev;
 840
 841         /* set the fb pointer */
 842         for (i = 0; i < fb_helper->crtc_count; i++) {
 843                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 844         }
 845
 846         if (new_fb) {
 847                 info->var.pixclock = 0;
 848                 if (register_framebuffer(info) < 0) {
 849                         return -EINVAL;
 850                 }
 851
 852                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 853                        info->fix.id);
 854
 855         } else {
 856                 drm_fb_helper_set_par(info);
 857         }
 858
 859         /* Switch back to kernel console on panic */
 860         /* multi card linked list maybe */
 861         if (list_empty(&kernel_fb_helper_list)) {
 862                 printk(KERN_INFO "registered panic notifier\n");
 863                 atomic_notifier_chain_register(&panic_notifier_list,
 864                                                &paniced);
 865                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 866         }
 867         if (new_fb)
 868                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 869
 870         return 0;
 871 }
 872 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 873
 874 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 875                             uint32_t depth)
 876 {
 877         info->fix.type = FB_TYPE_PACKED_PIXELS;
 878         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 879                 FB_VISUAL_TRUECOLOR;
 880         info->fix.type_aux = 0;
 881         info->fix.xpanstep = 1; /* doing it in hw */
 882         info->fix.ypanstep = 1; /* doing it in hw */
 883         info->fix.ywrapstep = 0;
 884         info->fix.accel = FB_ACCEL_NONE;
 885         info->fix.type_aux = 0;
 886
 887         info->fix.line_length = pitch;
 888         return;
 889 }
 890 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 891
 892 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 893                             uint32_t fb_width, uint32_t fb_height)
 894 {
 895         struct drm_framebuffer *fb = fb_helper->fb;
 896         info->pseudo_palette = fb_helper->pseudo_palette;
 897         info->var.xres_virtual = fb->width;
 898         info->var.yres_virtual = fb->height;
 899         info->var.bits_per_pixel = fb->bits_per_pixel;
 900         info->var.xoffset = 0;
 901         info->var.yoffset = 0;
 902         info->var.activate = FB_ACTIVATE_NOW;
 903         info->var.height = -1;
 904         info->var.width = -1;
 905
 906         switch (fb->depth) {
 907         case 8:
 908                 info->var.red.offset = 0;
 909                 info->var.green.offset = 0;
 910                 info->var.blue.offset = 0;
 911                 info->var.red.length = 8; /* 8bit DAC */
 912                 info->var.green.length = 8;
 913                 info->var.blue.length = 8;
 914                 info->var.transp.offset = 0;
 915                 info->var.transp.length = 0;
 916                 break;
 917         case 15:
 918                 info->var.red.offset = 10;
 919                 info->var.green.offset = 5;
 920                 info->var.blue.offset = 0;
 921                 info->var.red.length = 5;
 922                 info->var.green.length = 5;
 923                 info->var.blue.length = 5;
 924                 info->var.transp.offset = 15;
 925                 info->var.transp.length = 1;
 926                 break;
 927         case 16:
 928                 info->var.red.offset = 11;
 929                 info->var.green.offset = 5;
 930                 info->var.blue.offset = 0;
 931                 info->var.red.length = 5;
 932                 info->var.green.length = 6;
 933                 info->var.blue.length = 5;
 934                 info->var.transp.offset = 0;
 935                 break;
 936         case 24:
 937                 info->var.red.offset = 16;
 938                 info->var.green.offset = 8;
 939                 info->var.blue.offset = 0;
 940                 info->var.red.length = 8;
 941                 info->var.green.length = 8;
 942                 info->var.blue.length = 8;
 943                 info->var.transp.offset = 0;
 944                 info->var.transp.length = 0;
 945                 break;
 946         case 32:
 947                 info->var.red.offset = 16;
 948                 info->var.green.offset = 8;
 949                 info->var.blue.offset = 0;
 950                 info->var.red.length = 8;
 951                 info->var.green.length = 8;
 952                 info->var.blue.length = 8;
 953                 info->var.transp.offset = 24;
 954                 info->var.transp.length = 8;
 955                 break;
 956         default:
 957                 break;
 958         }
 959
 960         info->var.xres = fb_width;
 961         info->var.yres = fb_height;
 962 }
 963 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 964
 965 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 966                                                uint32_t maxX,
 967                                                uint32_t maxY)
 968 {
 969         struct drm_connector *connector;
 970         int count = 0;
 971         int i;
 972
 973         for (i = 0; i < fb_helper->connector_count; i++) {
 974                 connector = fb_helper->connector_info[i]->connector;
 975                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 976         }
 977
 978         return count;
 979 }
 980
 981 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
 982 {
 983         struct drm_display_mode *mode;
 984
 985         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
 986                 if (drm_mode_width(mode) > width ||
 987                     drm_mode_height(mode) > height)
 988                         continue;
 989                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 990                         return mode;
 991         }
 992         return NULL;
 993 }
 994
 995 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
 996 {
 997         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 998         cmdline_mode = &fb_connector->cmdline_mode;
 999         return cmdline_mode->specified;
1000 }
1001
1002 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1003                                                       int width, int height)
1004 {
1005         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1006         struct drm_display_mode *mode = NULL;
1007
1008         cmdline_mode = &fb_helper_conn->cmdline_mode;
1009         if (cmdline_mode->specified == false)
1010                 return mode;
1011
1012         /* attempt to find a matching mode in the list of modes
1013          *  we have gotten so far, if not add a CVT mode that conforms
1014          */
1015         if (cmdline_mode->rb || cmdline_mode->margins)
1016                 goto create_mode;
1017
1018         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1019                 /* check width/height */
1020                 if (mode->hdisplay != cmdline_mode->xres ||
1021                     mode->vdisplay != cmdline_mode->yres)
1022                         continue;
1023
1024                 if (cmdline_mode->refresh_specified) {
1025                         if (mode->vrefresh != cmdline_mode->refresh)
1026                                 continue;
1027                 }
1028
1029                 if (cmdline_mode->interlace) {
1030                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1031                                 continue;
1032                 }
1033                 return mode;
1034         }
1035
1036 create_mode:
1037         mode = drm_cvt_mode(fb_helper_conn->connector->dev, cmdline_mode->xres,
1038                             cmdline_mode->yres,
1039                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1040                             cmdline_mode->rb, cmdline_mode->interlace,
1041                             cmdline_mode->margins);
1042         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1043         list_add(&mode->head, &fb_helper_conn->connector->modes);
1044         return mode;
1045 }
1046
1047 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1048 {
1049         bool enable;
1050
1051         if (strict) {
1052                 enable = connector->status == connector_status_connected;
1053         } else {
1054                 enable = connector->status != connector_status_disconnected;
1055         }
1056         return enable;
1057 }
1058
1059 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1060                                   bool *enabled)
1061 {
1062         bool any_enabled = false;
1063         struct drm_connector *connector;
1064         int i = 0;
1065
1066         for (i = 0; i < fb_helper->connector_count; i++) {
1067                 connector = fb_helper->connector_info[i]->connector;
1068                 enabled[i] = drm_connector_enabled(connector, true);
1069                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1070                           enabled[i] ? "yes" : "no");
1071                 any_enabled |= enabled[i];
1072         }
1073
1074         if (any_enabled)
1075                 return;
1076
1077         for (i = 0; i < fb_helper->connector_count; i++) {
1078                 connector = fb_helper->connector_info[i]->connector;
1079                 enabled[i] = drm_connector_enabled(connector, false);
1080         }
1081 }
1082
1083 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1084                                  struct drm_display_mode **modes,
1085                                  bool *enabled, int width, int height)
1086 {
1087         struct drm_fb_helper_connector *fb_helper_conn;
1088         int i;
1089
1090         for (i = 0; i < fb_helper->connector_count; i++) {
1091                 fb_helper_conn = fb_helper->connector_info[i];
1092
1093                 if (enabled[i] == false)
1094                         continue;
1095
1096                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1097                               fb_helper_conn->connector->base.id);
1098
1099                 /* got for command line mode first */
1100                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1101                 if (!modes[i]) {
1102                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1103                                       fb_helper_conn->connector->base.id);
1104                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1105                 }
1106                 /* No preferred modes, pick one off the list */
1107                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1108                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1109                                 break;
1110                 }
1111                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1112                           "none");
1113         }
1114         return true;
1115 }
1116
1117 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1118                           struct drm_fb_helper_crtc **best_crtcs,
1119                           struct drm_display_mode **modes,
1120                           int n, int width, int height)
1121 {
1122         int c, o;
1123         struct drm_device *dev = fb_helper->dev;
1124         struct drm_connector *connector;
1125         struct drm_connector_helper_funcs *connector_funcs;
1126         struct drm_encoder *encoder;
1127         struct drm_fb_helper_crtc *best_crtc;
1128         int my_score, best_score, score;
1129         struct drm_fb_helper_crtc **crtcs, *crtc;
1130         struct drm_fb_helper_connector *fb_helper_conn;
1131
1132         if (n == fb_helper->connector_count)
1133                 return 0;
1134
1135         fb_helper_conn = fb_helper->connector_info[n];
1136         connector = fb_helper_conn->connector;
1137
1138         best_crtcs[n] = NULL;
1139         best_crtc = NULL;
1140         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1141         if (modes[n] == NULL)
1142                 return best_score;
1143
1144         crtcs = kzalloc(dev->mode_config.num_connector *
1145                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1146         if (!crtcs)
1147                 return best_score;
1148
1149         my_score = 1;
1150         if (connector->status == connector_status_connected)
1151                 my_score++;
1152         if (drm_has_cmdline_mode(fb_helper_conn))
1153                 my_score++;
1154         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1155                 my_score++;
1156
1157         connector_funcs = connector->helper_private;
1158         encoder = connector_funcs->best_encoder(connector);
1159         if (!encoder)
1160                 goto out;
1161
1162         /* select a crtc for this connector and then attempt to configure
1163            remaining connectors */
1164         for (c = 0; c < fb_helper->crtc_count; c++) {
1165                 crtc = &fb_helper->crtc_info[c];
1166
1167                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1168                         continue;
1169                 }
1170
1171                 for (o = 0; o < n; o++)
1172                         if (best_crtcs[o] == crtc)
1173                                 break;
1174
1175                 if (o < n) {
1176                         /* ignore cloning for now */
1177                         continue;
1178                 }
1179
1180                 crtcs[n] = crtc;
1181                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1182                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1183                                                   width, height);
1184                 if (score > best_score) {
1185                         best_crtc = crtc;
1186                         best_score = score;
1187                         memcpy(best_crtcs, crtcs,
1188                                dev->mode_config.num_connector *
1189                                sizeof(struct drm_fb_helper_crtc *));
1190                 }
1191         }
1192 out:
1193         kfree(crtcs);
1194         return best_score;
1195 }
1196
1197 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1198 {
1199         struct drm_device *dev = fb_helper->dev;
1200         struct drm_fb_helper_crtc **crtcs;
1201         struct drm_display_mode **modes;
1202         struct drm_encoder *encoder;
1203         struct drm_mode_set *modeset;
1204         bool *enabled;
1205         int width, height;
1206         int i, ret;
1207
1208         DRM_DEBUG_KMS("\n");
1209
1210         width = dev->mode_config.max_width;
1211         height = dev->mode_config.max_height;
1212
1213         /* clean out all the encoder/crtc combos */
1214         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1215                 encoder->crtc = NULL;
1216         }
1217
1218         crtcs = kcalloc(dev->mode_config.num_connector,
1219                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1220         modes = kcalloc(dev->mode_config.num_connector,
1221                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1222         enabled = kcalloc(dev->mode_config.num_connector,
1223                           sizeof(bool), GFP_KERNEL);
1224
1225         drm_enable_connectors(fb_helper, enabled);
1226
1227         ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1228         if (!ret)
1229                 DRM_ERROR("Unable to find initial modes\n");
1230
1231         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1232
1233         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1234
1235         /* need to set the modesets up here for use later */
1236         /* fill out the connector<->crtc mappings into the modesets */
1237         for (i = 0; i < fb_helper->crtc_count; i++) {
1238                 modeset = &fb_helper->crtc_info[i].mode_set;
1239                 modeset->num_connectors = 0;
1240         }
1241
1242         for (i = 0; i < fb_helper->connector_count; i++) {
1243                 struct drm_display_mode *mode = modes[i];
1244                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1245                 modeset = &fb_crtc->mode_set;
1246
1247                 if (mode && fb_crtc) {
1248                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1249                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1250                         fb_crtc->desired_mode = mode;
1251                         if (modeset->mode)
1252                                 drm_mode_destroy(dev, modeset->mode);
1253                         modeset->mode = drm_mode_duplicate(dev,
1254                                                            fb_crtc->desired_mode);
1255                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1256                 }
1257         }
1258
1259         kfree(crtcs);
1260         kfree(modes);
1261         kfree(enabled);
1262 }
1263
1264 /**
1265  * drm_helper_initial_config - setup a sane initial connector configuration
1266  * @dev: DRM device
1267  *
1268  * LOCKING:
1269  * Called at init time, must take mode config lock.
1270  *
1271  * Scan the CRTCs and connectors and try to put together an initial setup.
1272  * At the moment, this is a cloned configuration across all heads with
1273  * a new framebuffer object as the backing store.
1274  *
1275  * RETURNS:
1276  * Zero if everything went ok, nonzero otherwise.
1277  */
1278 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1279 {
1280         struct drm_device *dev = fb_helper->dev;
1281         int count = 0;
1282
1283         /* disable all the possible outputs/crtcs before entering KMS mode */
1284         drm_helper_disable_unused_functions(fb_helper->dev);
1285
1286         drm_fb_helper_parse_command_line(fb_helper);
1287
1288         count = drm_fb_helper_probe_connector_modes(fb_helper,
1289                                                     dev->mode_config.max_width,
1290                                                     dev->mode_config.max_height);
1291         /*
1292          * we shouldn't end up with no modes here.
1293          */
1294         if (count == 0) {
1295                 if (fb_helper->poll_enabled) {
1296                         delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work,
1297                                                   5*HZ);
1298                         printk(KERN_INFO "No connectors reported connected with modes - started polling\n");
1299                 } else
1300                         printk(KERN_INFO "No connectors reported connected with modes\n");
1301         }
1302         drm_setup_crtcs(fb_helper);
1303
1304         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1305 }
1306 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1307
1308 /* we got a hotplug irq - need to update fbcon */
1309 void drm_helper_fb_hpd_irq_event(struct drm_fb_helper *fb_helper)
1310 {
1311         /* if we don't have the fbdev registered yet do nothing */
1312         if (!fb_helper->fbdev)
1313                 return;
1314
1315         /* schedule a slow work asap */
1316         delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 0);
1317 }
1318 EXPORT_SYMBOL(drm_helper_fb_hpd_irq_event);
1319
1320 bool drm_helper_fb_hotplug_event(struct drm_fb_helper *fb_helper, bool polled)
1321 {
1322         int count = 0;
1323         int ret;
1324         u32 max_width, max_height, bpp_sel;
1325
1326         if (!fb_helper->fb)
1327                 return false;
1328         DRM_DEBUG_KMS("\n");
1329
1330         max_width = fb_helper->fb->width;
1331         max_height = fb_helper->fb->height;
1332         bpp_sel = fb_helper->fb->bits_per_pixel;
1333
1334         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1335                                                     max_height);
1336         if (fb_helper->poll_enabled && !polled) {
1337                 if (count) {
1338                         delayed_slow_work_cancel(&fb_helper->output_status_change_slow_work);
1339                 } else {
1340                         ret = delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 5*HZ);
1341                 }
1342         }
1343         drm_setup_crtcs(fb_helper);
1344
1345         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1346 }
1347 EXPORT_SYMBOL(drm_helper_fb_hotplug_event);
1348
1349 /*
1350  * delayed work queue execution function
1351  * - check if fbdev is actually in use on the gpu
1352  *   - if not set delayed flag and repoll if necessary
1353  * - check for connector status change
1354  * - repoll if 0 modes found
1355  *- call driver output status changed notifier
1356  */
1357 static void output_status_change_execute(struct slow_work *work)
1358 {
1359         struct delayed_slow_work *delayed_work = container_of(work, struct delayed_slow_work, work);
1360         struct drm_fb_helper *fb_helper = container_of(delayed_work, struct drm_fb_helper, output_status_change_slow_work);
1361         struct drm_connector *connector;
1362         enum drm_connector_status old_status, status;
1363         bool repoll, changed = false;
1364         int ret;
1365         int i;
1366         bool bound = false, crtcs_bound = false;
1367         struct drm_crtc *crtc;
1368
1369         repoll = fb_helper->poll_enabled;
1370
1371         /* first of all check the fbcon framebuffer is actually bound to any crtc */
1372         /* take into account that no crtc at all maybe bound */
1373         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1374                 if (crtc->fb)
1375                         crtcs_bound = true;
1376                 if (crtc->fb == fb_helper->fb)
1377                         bound = true;
1378         }
1379
1380         if (bound == false && crtcs_bound) {
1381                 fb_helper->delayed_hotplug = true;
1382                 goto requeue;
1383         }
1384
1385         for (i = 0; i < fb_helper->connector_count; i++) {
1386                 connector = fb_helper->connector_info[i]->connector;
1387                 old_status = connector->status;
1388                 status = connector->funcs->detect(connector);
1389                 if (old_status != status) {
1390                         changed = true;
1391                 }
1392                 if (status == connector_status_connected && repoll) {
1393                         DRM_DEBUG("%s is connected - stop polling\n", drm_get_connector_name(connector));
1394                         repoll = false;
1395                 }
1396         }
1397
1398         if (changed) {
1399                 if (fb_helper->funcs->fb_output_status_changed)
1400                         fb_helper->funcs->fb_output_status_changed(fb_helper);
1401         }
1402
1403 requeue:
1404         if (repoll) {
1405                 ret = delayed_slow_work_enqueue(delayed_work, 5*HZ);
1406                 if (ret)
1407                         DRM_ERROR("delayed enqueue failed %d\n", ret);
1408         }
1409 }
1410
1411 static struct slow_work_ops output_status_change_ops = {
1412         .execute = output_status_change_execute,
1413 };
1414