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 static struct slow_work_ops output_status_change_ops;
  45
  46 /* simple single crtc case helper function */
  47 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  48 {
  49         struct drm_device *dev = fb_helper->dev;
  50         struct drm_connector *connector;
  51         int i;
  52
  53         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  54                 struct drm_fb_helper_connector *fb_helper_connector;
  55
  56                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  57                 if (!fb_helper_connector)
  58                         goto fail;
  59
  60                 fb_helper_connector->connector = connector;
  61                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  62         }
  63         return 0;
  64 fail:
  65         for (i = 0; i < fb_helper->connector_count; i++) {
  66                 kfree(fb_helper->connector_info[i]);
  67                 fb_helper->connector_info[i] = NULL;
  68         }
  69         fb_helper->connector_count = 0;
  70         return -ENOMEM;
  71 }
  72 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
  73
  74 /**
  75  * drm_fb_helper_connector_parse_command_line - parse command line for connector
  76  * @connector - connector to parse line for
  77  * @mode_option - per connector mode option
  78  *
  79  * This parses the connector specific then generic command lines for
  80  * modes and options to configure the connector.
  81  *
  82  * This uses the same parameters as the fb modedb.c, except for extra
  83  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
  84  *
  85  * enable/enable Digital/disable bit at the end
  86  */
  87 static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_connector *fb_helper_conn,
  88                                                        const char *mode_option)
  89 {
  90         const char *name;
  91         unsigned int namelen;
  92         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
  93         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
  94         int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
  95         int i;
  96         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
  97         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  98         struct drm_connector *connector = fb_helper_conn->connector;
  99
 100         if (!fb_helper_conn)
 101                 return false;
 102
 103         cmdline_mode = &fb_helper_conn->cmdline_mode;
 104         if (!mode_option)
 105                 mode_option = fb_mode_option;
 106
 107         if (!mode_option) {
 108                 cmdline_mode->specified = false;
 109                 return false;
 110         }
 111
 112         name = mode_option;
 113         namelen = strlen(name);
 114         for (i = namelen-1; i >= 0; i--) {
 115                 switch (name[i]) {
 116                 case '@':
 117                         namelen = i;
 118                         if (!refresh_specified && !bpp_specified &&
 119                             !yres_specified) {
 120                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 121                                 refresh_specified = 1;
 122                                 if (cvt || rb)
 123                                         cvt = 0;
 124                         } else
 125                                 goto done;
 126                         break;
 127                 case '-':
 128                         namelen = i;
 129                         if (!bpp_specified && !yres_specified) {
 130                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 131                                 bpp_specified = 1;
 132                                 if (cvt || rb)
 133                                         cvt = 0;
 134                         } else
 135                                 goto done;
 136                         break;
 137                 case 'x':
 138                         if (!yres_specified) {
 139                                 yres = simple_strtol(&name[i+1], NULL, 10);
 140                                 yres_specified = 1;
 141                         } else
 142                                 goto done;
 143                 case '0' ... '9':
 144                         break;
 145                 case 'M':
 146                         if (!yres_specified)
 147                                 cvt = 1;
 148                         break;
 149                 case 'R':
 150                         if (!cvt)
 151                                 rb = 1;
 152                         break;
 153                 case 'm':
 154                         if (!cvt)
 155                                 margins = 1;
 156                         break;
 157                 case 'i':
 158                         if (!cvt)
 159                                 interlace = 1;
 160                         break;
 161                 case 'e':
 162                         force = DRM_FORCE_ON;
 163                         break;
 164                 case 'D':
 165                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 166                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 167                                 force = DRM_FORCE_ON;
 168                         else
 169                                 force = DRM_FORCE_ON_DIGITAL;
 170                         break;
 171                 case 'd':
 172                         force = DRM_FORCE_OFF;
 173                         break;
 174                 default:
 175                         goto done;
 176                 }
 177         }
 178         if (i < 0 && yres_specified) {
 179                 xres = simple_strtol(name, NULL, 10);
 180                 res_specified = 1;
 181         }
 182 done:
 183
 184         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 185                 drm_get_connector_name(connector), xres, yres,
 186                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 187                 "", (margins) ? " with margins" : "", (interlace) ?
 188                 " interlaced" : "");
 189
 190         if (force) {
 191                 const char *s;
 192                 switch (force) {
 193                 case DRM_FORCE_OFF: s = "OFF"; break;
 194                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 195                 default:
 196                 case DRM_FORCE_ON: s = "ON"; break;
 197                 }
 198
 199                 DRM_INFO("forcing %s connector %s\n",
 200                          drm_get_connector_name(connector), s);
 201                 connector->force = force;
 202         }
 203
 204         if (res_specified) {
 205                 cmdline_mode->specified = true;
 206                 cmdline_mode->xres = xres;
 207                 cmdline_mode->yres = yres;
 208         }
 209
 210         if (refresh_specified) {
 211                 cmdline_mode->refresh_specified = true;
 212                 cmdline_mode->refresh = refresh;
 213         }
 214
 215         if (bpp_specified) {
 216                 cmdline_mode->bpp_specified = true;
 217                 cmdline_mode->bpp = bpp;
 218         }
 219         cmdline_mode->rb = rb ? true : false;
 220         cmdline_mode->cvt = cvt  ? true : false;
 221         cmdline_mode->interlace = interlace ? true : false;
 222
 223         return true;
 224 }
 225
 226 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 227 {
 228         struct drm_fb_helper_connector *fb_helper_conn;
 229         int i;
 230
 231         for (i = 0; i < fb_helper->connector_count; i++) {
 232                 char *option = NULL;
 233
 234                 fb_helper_conn = fb_helper->connector_info[i];
 235
 236                 /* do something on return - turn off connector maybe */
 237                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
 238                         continue;
 239
 240                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
 241         }
 242         return 0;
 243 }
 244
 245 bool drm_fb_helper_force_kernel_mode(void)
 246 {
 247         int i = 0;
 248         bool ret, error = false;
 249         struct drm_fb_helper *helper;
 250
 251         if (list_empty(&kernel_fb_helper_list))
 252                 return false;
 253
 254         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 255                 for (i = 0; i < helper->crtc_count; i++) {
 256                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 257                         ret = drm_crtc_helper_set_config(mode_set);
 258                         if (ret)
 259                                 error = true;
 260                 }
 261         }
 262         return error;
 263 }
 264
 265 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 266                         void *panic_str)
 267 {
 268         DRM_ERROR("panic occurred, switching back to text console\n");
 269         return drm_fb_helper_force_kernel_mode();
 270         return 0;
 271 }
 272 EXPORT_SYMBOL(drm_fb_helper_panic);
 273
 274 static struct notifier_block paniced = {
 275         .notifier_call = drm_fb_helper_panic,
 276 };
 277
 278 /**
 279  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 280  *
 281  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 282  */
 283 void drm_fb_helper_restore(void)
 284 {
 285         bool ret;
 286         ret = drm_fb_helper_force_kernel_mode();
 287         if (ret == true)
 288                 DRM_ERROR("Failed to restore crtc configuration\n");
 289 }
 290 EXPORT_SYMBOL(drm_fb_helper_restore);
 291
 292 #ifdef CONFIG_MAGIC_SYSRQ
 293 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 294 {
 295         drm_fb_helper_restore();
 296 }
 297 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 298
 299 static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
 300 {
 301         schedule_work(&drm_fb_helper_restore_work);
 302 }
 303
 304 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 305         .handler = drm_fb_helper_sysrq,
 306         .help_msg = "force-fb(V)",
 307         .action_msg = "Restore framebuffer console",
 308 };
 309 #else
 310 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 311 #endif
 312
 313 static void drm_fb_helper_on(struct fb_info *info)
 314 {
 315         struct drm_fb_helper *fb_helper = info->par;
 316         struct drm_device *dev = fb_helper->dev;
 317         struct drm_crtc *crtc;
 318         struct drm_crtc_helper_funcs *crtc_funcs;
 319         struct drm_encoder *encoder;
 320         int i;
 321
 322         /*
 323          * For each CRTC in this fb, turn the crtc on then,
 324          * find all associated encoders and turn them on.
 325          */
 326         mutex_lock(&dev->mode_config.mutex);
 327         for (i = 0; i < fb_helper->crtc_count; i++) {
 328                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 329                 crtc_funcs = crtc->helper_private;
 330
 331                 if (!crtc->enabled)
 332                         continue;
 333
 334                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 335
 336
 337                 /* Found a CRTC on this fb, now find encoders */
 338                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 339                         if (encoder->crtc == crtc) {
 340                                 struct drm_encoder_helper_funcs *encoder_funcs;
 341
 342                                 encoder_funcs = encoder->helper_private;
 343                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 344                         }
 345                 }
 346         }
 347         mutex_unlock(&dev->mode_config.mutex);
 348 }
 349
 350 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 351 {
 352         struct drm_fb_helper *fb_helper = info->par;
 353         struct drm_device *dev = fb_helper->dev;
 354         struct drm_crtc *crtc;
 355         struct drm_crtc_helper_funcs *crtc_funcs;
 356         struct drm_encoder *encoder;
 357         int i;
 358
 359         /*
 360          * For each CRTC in this fb, find all associated encoders
 361          * and turn them off, then turn off the CRTC.
 362          */
 363         mutex_lock(&dev->mode_config.mutex);
 364         for (i = 0; i < fb_helper->crtc_count; i++) {
 365                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 366                 crtc_funcs = crtc->helper_private;
 367
 368                 if (!crtc->enabled)
 369                         continue;
 370
 371                 /* Found a CRTC on this fb, now find encoders */
 372                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 373                         if (encoder->crtc == crtc) {
 374                                 struct drm_encoder_helper_funcs *encoder_funcs;
 375
 376                                 encoder_funcs = encoder->helper_private;
 377                                 encoder_funcs->dpms(encoder, dpms_mode);
 378                         }
 379                 }
 380                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 381         }
 382         mutex_unlock(&dev->mode_config.mutex);
 383 }
 384
 385 int drm_fb_helper_blank(int blank, struct fb_info *info)
 386 {
 387         switch (blank) {
 388         /* Display: On; HSync: On, VSync: On */
 389         case FB_BLANK_UNBLANK:
 390                 drm_fb_helper_on(info);
 391                 break;
 392         /* Display: Off; HSync: On, VSync: On */
 393         case FB_BLANK_NORMAL:
 394                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 395                 break;
 396         /* Display: Off; HSync: Off, VSync: On */
 397         case FB_BLANK_HSYNC_SUSPEND:
 398                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 399                 break;
 400         /* Display: Off; HSync: On, VSync: Off */
 401         case FB_BLANK_VSYNC_SUSPEND:
 402                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 403                 break;
 404         /* Display: Off; HSync: Off, VSync: Off */
 405         case FB_BLANK_POWERDOWN:
 406                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 407                 break;
 408         }
 409         return 0;
 410 }
 411 EXPORT_SYMBOL(drm_fb_helper_blank);
 412
 413 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 414 {
 415         int i;
 416
 417         for (i = 0; i < helper->connector_count; i++)
 418                 kfree(helper->connector_info[i]);
 419         kfree(helper->connector_info);
 420         for (i = 0; i < helper->crtc_count; i++)
 421                 kfree(helper->crtc_info[i].mode_set.connectors);
 422         kfree(helper->crtc_info);
 423 }
 424
 425 int drm_fb_helper_init(struct drm_device *dev,
 426                        struct drm_fb_helper *fb_helper,
 427                        int crtc_count, int max_conn_count,
 428                        bool polled)
 429 {
 430         struct drm_crtc *crtc;
 431         int ret = 0;
 432         int i;
 433
 434         fb_helper->dev = dev;
 435         fb_helper->poll_enabled = polled;
 436
 437         slow_work_register_user(THIS_MODULE);
 438         delayed_slow_work_init(&fb_helper->output_status_change_slow_work,
 439                                &output_status_change_ops);
 440
 441         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 442
 443         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 444         if (!fb_helper->crtc_info)
 445                 return -ENOMEM;
 446
 447         fb_helper->crtc_count = crtc_count;
 448         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 449         if (!fb_helper->connector_info) {
 450                 kfree(fb_helper->crtc_info);
 451                 return -ENOMEM;
 452         }
 453         fb_helper->connector_count = 0;
 454
 455         for (i = 0; i < crtc_count; i++) {
 456                 fb_helper->crtc_info[i].mode_set.connectors =
 457                         kcalloc(max_conn_count,
 458                                 sizeof(struct drm_connector *),
 459                                 GFP_KERNEL);
 460
 461                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 462                         ret = -ENOMEM;
 463                         goto out_free;
 464                 }
 465                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 466         }
 467
 468         i = 0;
 469         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 470                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 471                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 472                 i++;
 473         }
 474         fb_helper->conn_limit = max_conn_count;
 475         return 0;
 476 out_free:
 477         drm_fb_helper_crtc_free(fb_helper);
 478         return -ENOMEM;
 479 }
 480 EXPORT_SYMBOL(drm_fb_helper_init);
 481
 482 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 483 {
 484         if (!list_empty(&fb_helper->kernel_fb_list)) {
 485                 list_del(&fb_helper->kernel_fb_list);
 486                 if (list_empty(&kernel_fb_helper_list)) {
 487                         printk(KERN_INFO "unregistered panic notifier\n");
 488                         atomic_notifier_chain_unregister(&panic_notifier_list,
 489                                                          &paniced);
 490                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 491                 }
 492         }
 493
 494         drm_fb_helper_crtc_free(fb_helper);
 495
 496         delayed_slow_work_cancel(&fb_helper->output_status_change_slow_work);
 497         slow_work_unregister_user(THIS_MODULE);
 498 }
 499 EXPORT_SYMBOL(drm_fb_helper_fini);
 500
 501 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 502                      u16 blue, u16 regno, struct fb_info *info)
 503 {
 504         struct drm_fb_helper *fb_helper = info->par;
 505         struct drm_framebuffer *fb = fb_helper->fb;
 506         int pindex;
 507
 508         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 509                 u32 *palette;
 510                 u32 value;
 511                 /* place color in psuedopalette */
 512                 if (regno > 16)
 513                         return -EINVAL;
 514                 palette = (u32 *)info->pseudo_palette;
 515                 red >>= (16 - info->var.red.length);
 516                 green >>= (16 - info->var.green.length);
 517                 blue >>= (16 - info->var.blue.length);
 518                 value = (red << info->var.red.offset) |
 519                         (green << info->var.green.offset) |
 520                         (blue << info->var.blue.offset);
 521                 palette[regno] = value;
 522                 return 0;
 523         }
 524
 525         pindex = regno;
 526
 527         if (fb->bits_per_pixel == 16) {
 528                 pindex = regno << 3;
 529
 530                 if (fb->depth == 16 && regno > 63)
 531                         return -EINVAL;
 532                 if (fb->depth == 15 && regno > 31)
 533                         return -EINVAL;
 534
 535                 if (fb->depth == 16) {
 536                         u16 r, g, b;
 537                         int i;
 538                         if (regno < 32) {
 539                                 for (i = 0; i < 8; i++)
 540                                         fb_helper->funcs->gamma_set(crtc, red,
 541                                                 green, blue, pindex + i);
 542                         }
 543
 544                         fb_helper->funcs->gamma_get(crtc, &r,
 545                                                     &g, &b,
 546                                                     pindex >> 1);
 547
 548                         for (i = 0; i < 4; i++)
 549                                 fb_helper->funcs->gamma_set(crtc, r,
 550                                                             green, b,
 551                                                             (pindex >> 1) + i);
 552                 }
 553         }
 554
 555         if (fb->depth != 16)
 556                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 557         return 0;
 558 }
 559
 560 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 561 {
 562         struct drm_fb_helper *fb_helper = info->par;
 563         struct drm_crtc_helper_funcs *crtc_funcs;
 564         u16 *red, *green, *blue, *transp;
 565         struct drm_crtc *crtc;
 566         int i, rc = 0;
 567         int start;
 568
 569         for (i = 0; i < fb_helper->crtc_count; i++) {
 570                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 571                 crtc_funcs = crtc->helper_private;
 572
 573                 red = cmap->red;
 574                 green = cmap->green;
 575                 blue = cmap->blue;
 576                 transp = cmap->transp;
 577                 start = cmap->start;
 578
 579                 for (i = 0; i < cmap->len; i++) {
 580                         u16 hred, hgreen, hblue, htransp = 0xffff;
 581
 582                         hred = *red++;
 583                         hgreen = *green++;
 584                         hblue = *blue++;
 585
 586                         if (transp)
 587                                 htransp = *transp++;
 588
 589                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 590                         if (rc)
 591                                 return rc;
 592                 }
 593                 crtc_funcs->load_lut(crtc);
 594         }
 595         return rc;
 596 }
 597 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 598
 599 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 600                             struct fb_info *info)
 601 {
 602         struct drm_fb_helper *fb_helper = info->par;
 603         struct drm_framebuffer *fb = fb_helper->fb;
 604         int depth;
 605
 606         if (var->pixclock != 0)
 607                 return -EINVAL;
 608
 609         /* Need to resize the fb object !!! */
 610         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 611                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 612                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 613                           fb->width, fb->height, fb->bits_per_pixel);
 614                 return -EINVAL;
 615         }
 616
 617         switch (var->bits_per_pixel) {
 618         case 16:
 619                 depth = (var->green.length == 6) ? 16 : 15;
 620                 break;
 621         case 32:
 622                 depth = (var->transp.length > 0) ? 32 : 24;
 623                 break;
 624         default:
 625                 depth = var->bits_per_pixel;
 626                 break;
 627         }
 628
 629         switch (depth) {
 630         case 8:
 631                 var->red.offset = 0;
 632                 var->green.offset = 0;
 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 15:
 641                 var->red.offset = 10;
 642                 var->green.offset = 5;
 643                 var->blue.offset = 0;
 644                 var->red.length = 5;
 645                 var->green.length = 5;
 646                 var->blue.length = 5;
 647                 var->transp.length = 1;
 648                 var->transp.offset = 15;
 649                 break;
 650         case 16:
 651                 var->red.offset = 11;
 652                 var->green.offset = 5;
 653                 var->blue.offset = 0;
 654                 var->red.length = 5;
 655                 var->green.length = 6;
 656                 var->blue.length = 5;
 657                 var->transp.length = 0;
 658                 var->transp.offset = 0;
 659                 break;
 660         case 24:
 661                 var->red.offset = 16;
 662                 var->green.offset = 8;
 663                 var->blue.offset = 0;
 664                 var->red.length = 8;
 665                 var->green.length = 8;
 666                 var->blue.length = 8;
 667                 var->transp.length = 0;
 668                 var->transp.offset = 0;
 669                 break;
 670         case 32:
 671                 var->red.offset = 16;
 672                 var->green.offset = 8;
 673                 var->blue.offset = 0;
 674                 var->red.length = 8;
 675                 var->green.length = 8;
 676                 var->blue.length = 8;
 677                 var->transp.length = 8;
 678                 var->transp.offset = 24;
 679                 break;
 680         default:
 681                 return -EINVAL;
 682         }
 683         return 0;
 684 }
 685 EXPORT_SYMBOL(drm_fb_helper_check_var);
 686
 687 /* this will let fbcon do the mode init */
 688 int drm_fb_helper_set_par(struct fb_info *info)
 689 {
 690         struct drm_fb_helper *fb_helper = info->par;
 691         struct drm_device *dev = fb_helper->dev;
 692         struct fb_var_screeninfo *var = &info->var;
 693         struct drm_crtc *crtc;
 694         int ret;
 695         int i;
 696
 697         if (var->pixclock != 0) {
 698                 DRM_ERROR("PIXEL CLOCK SET\n");
 699                 return -EINVAL;
 700         }
 701
 702         mutex_lock(&dev->mode_config.mutex);
 703         for (i = 0; i < fb_helper->crtc_count; i++) {
 704                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 705                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 706                 if (ret) {
 707                         mutex_unlock(&dev->mode_config.mutex);
 708                         return ret;
 709                 }
 710         }
 711         mutex_unlock(&dev->mode_config.mutex);
 712
 713         if (fb_helper->delayed_hotplug) {
 714                 fb_helper->delayed_hotplug = false;
 715                 delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 0);
 716         }
 717         return 0;
 718 }
 719 EXPORT_SYMBOL(drm_fb_helper_set_par);
 720
 721 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 722                               struct fb_info *info)
 723 {
 724         struct drm_fb_helper *fb_helper = info->par;
 725         struct drm_device *dev = fb_helper->dev;
 726         struct drm_mode_set *modeset;
 727         struct drm_crtc *crtc;
 728         int ret = 0;
 729         int i;
 730
 731         mutex_lock(&dev->mode_config.mutex);
 732         for (i = 0; i < fb_helper->crtc_count; i++) {
 733                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 734
 735                 modeset = &fb_helper->crtc_info[i].mode_set;
 736
 737                 modeset->x = var->xoffset;
 738                 modeset->y = var->yoffset;
 739
 740                 if (modeset->num_connectors) {
 741                         ret = crtc->funcs->set_config(modeset);
 742                         if (!ret) {
 743                                 info->var.xoffset = var->xoffset;
 744                                 info->var.yoffset = var->yoffset;
 745                         }
 746                 }
 747         }
 748         mutex_unlock(&dev->mode_config.mutex);
 749         return ret;
 750 }
 751 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 752
 753 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 754                                   int preferred_bpp)
 755 {
 756         int new_fb = 0;
 757         int crtc_count = 0;
 758         int i;
 759         struct fb_info *info;
 760         struct drm_fb_helper_surface_size sizes;
 761         int gamma_size = 0;
 762
 763         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 764         sizes.surface_depth = 24;
 765         sizes.surface_bpp = 32;
 766         sizes.fb_width = (unsigned)-1;
 767         sizes.fb_height = (unsigned)-1;
 768
 769         /* if driver picks 8 or 16 by default use that
 770            for both depth/bpp */
 771         if (preferred_bpp != sizes.surface_bpp) {
 772                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 773         }
 774         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 775         for (i = 0; i < fb_helper->connector_count; i++) {
 776                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 777                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 778
 779                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 780
 781                 if (cmdline_mode->bpp_specified) {
 782                         switch (cmdline_mode->bpp) {
 783                         case 8:
 784                                 sizes.surface_depth = sizes.surface_bpp = 8;
 785                                 break;
 786                         case 15:
 787                                 sizes.surface_depth = 15;
 788                                 sizes.surface_bpp = 16;
 789                                 break;
 790                         case 16:
 791                                 sizes.surface_depth = sizes.surface_bpp = 16;
 792                                 break;
 793                         case 24:
 794                                 sizes.surface_depth = sizes.surface_bpp = 24;
 795                                 break;
 796                         case 32:
 797                                 sizes.surface_depth = 24;
 798                                 sizes.surface_bpp = 32;
 799                                 break;
 800                         }
 801                         break;
 802                 }
 803         }
 804
 805         crtc_count = 0;
 806         for (i = 0; i < fb_helper->crtc_count; i++) {
 807                 struct drm_display_mode *desired_mode;
 808                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 809
 810                 if (desired_mode) {
 811                         if (gamma_size == 0)
 812                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 813                         if (desired_mode->hdisplay < sizes.fb_width)
 814                                 sizes.fb_width = desired_mode->hdisplay;
 815                         if (desired_mode->vdisplay < sizes.fb_height)
 816                                 sizes.fb_height = desired_mode->vdisplay;
 817                         if (desired_mode->hdisplay > sizes.surface_width)
 818                                 sizes.surface_width = desired_mode->hdisplay;
 819                         if (desired_mode->vdisplay > sizes.surface_height)
 820                                 sizes.surface_height = desired_mode->vdisplay;
 821                         crtc_count++;
 822                 }
 823         }
 824
 825         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 826                 /* hmm everyone went away - assume VGA cable just fell out
 827                    and will come back later. */
 828                 DRM_ERROR("Cannot find any crtc or sizes - going 1024x768\n");
 829                 sizes.fb_width = sizes.surface_width = 1024;
 830                 sizes.fb_height = sizes.surface_height = 768;
 831         }
 832
 833         /* push down into drivers */
 834         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 835         if (new_fb < 0)
 836                 return new_fb;
 837
 838         info = fb_helper->fbdev;
 839
 840         /* set the fb pointer */
 841         for (i = 0; i < fb_helper->crtc_count; i++) {
 842                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 843         }
 844
 845         if (new_fb) {
 846                 info->var.pixclock = 0;
 847                 if (register_framebuffer(info) < 0) {
 848                         return -EINVAL;
 849                 }
 850
 851                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 852                        info->fix.id);
 853
 854         } else {
 855                 drm_fb_helper_set_par(info);
 856         }
 857
 858         /* Switch back to kernel console on panic */
 859         /* multi card linked list maybe */
 860         if (list_empty(&kernel_fb_helper_list)) {
 861                 printk(KERN_INFO "registered panic notifier\n");
 862                 atomic_notifier_chain_register(&panic_notifier_list,
 863                                                &paniced);
 864                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 865         }
 866         if (new_fb)
 867                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 868
 869         return 0;
 870 }
 871 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 872
 873 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 874                             uint32_t depth)
 875 {
 876         info->fix.type = FB_TYPE_PACKED_PIXELS;
 877         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 878                 FB_VISUAL_TRUECOLOR;
 879         info->fix.type_aux = 0;
 880         info->fix.xpanstep = 1; /* doing it in hw */
 881         info->fix.ypanstep = 1; /* doing it in hw */
 882         info->fix.ywrapstep = 0;
 883         info->fix.accel = FB_ACCEL_NONE;
 884         info->fix.type_aux = 0;
 885
 886         info->fix.line_length = pitch;
 887         return;
 888 }
 889 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 890
 891 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 892                             uint32_t fb_width, uint32_t fb_height)
 893 {
 894         struct drm_framebuffer *fb = fb_helper->fb;
 895         info->pseudo_palette = fb_helper->pseudo_palette;
 896         info->var.xres_virtual = fb->width;
 897         info->var.yres_virtual = fb->height;
 898         info->var.bits_per_pixel = fb->bits_per_pixel;
 899         info->var.xoffset = 0;
 900         info->var.yoffset = 0;
 901         info->var.activate = FB_ACTIVATE_NOW;
 902         info->var.height = -1;
 903         info->var.width = -1;
 904
 905         switch (fb->depth) {
 906         case 8:
 907                 info->var.red.offset = 0;
 908                 info->var.green.offset = 0;
 909                 info->var.blue.offset = 0;
 910                 info->var.red.length = 8; /* 8bit DAC */
 911                 info->var.green.length = 8;
 912                 info->var.blue.length = 8;
 913                 info->var.transp.offset = 0;
 914                 info->var.transp.length = 0;
 915                 break;
 916         case 15:
 917                 info->var.red.offset = 10;
 918                 info->var.green.offset = 5;
 919                 info->var.blue.offset = 0;
 920                 info->var.red.length = 5;
 921                 info->var.green.length = 5;
 922                 info->var.blue.length = 5;
 923                 info->var.transp.offset = 15;
 924                 info->var.transp.length = 1;
 925                 break;
 926         case 16:
 927                 info->var.red.offset = 11;
 928                 info->var.green.offset = 5;
 929                 info->var.blue.offset = 0;
 930                 info->var.red.length = 5;
 931                 info->var.green.length = 6;
 932                 info->var.blue.length = 5;
 933                 info->var.transp.offset = 0;
 934                 break;
 935         case 24:
 936                 info->var.red.offset = 16;
 937                 info->var.green.offset = 8;
 938                 info->var.blue.offset = 0;
 939                 info->var.red.length = 8;
 940                 info->var.green.length = 8;
 941                 info->var.blue.length = 8;
 942                 info->var.transp.offset = 0;
 943                 info->var.transp.length = 0;
 944                 break;
 945         case 32:
 946                 info->var.red.offset = 16;
 947                 info->var.green.offset = 8;
 948                 info->var.blue.offset = 0;
 949                 info->var.red.length = 8;
 950                 info->var.green.length = 8;
 951                 info->var.blue.length = 8;
 952                 info->var.transp.offset = 24;
 953                 info->var.transp.length = 8;
 954                 break;
 955         default:
 956                 break;
 957         }
 958
 959         info->var.xres = fb_width;
 960         info->var.yres = fb_height;
 961 }
 962 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 963
 964 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 965                                                uint32_t maxX,
 966                                                uint32_t maxY)
 967 {
 968         struct drm_connector *connector;
 969         int count = 0;
 970         int i;
 971
 972         for (i = 0; i < fb_helper->connector_count; i++) {
 973                 connector = fb_helper->connector_info[i]->connector;
 974                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 975         }
 976
 977         return count;
 978 }
 979
 980 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
 981 {
 982         struct drm_display_mode *mode;
 983
 984         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
 985                 if (drm_mode_width(mode) > width ||
 986                     drm_mode_height(mode) > height)
 987                         continue;
 988                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 989                         return mode;
 990         }
 991         return NULL;
 992 }
 993
 994 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
 995 {
 996         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 997         cmdline_mode = &fb_connector->cmdline_mode;
 998         return cmdline_mode->specified;
 999 }
1000
1001 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1002                                                       int width, int height)
1003 {
1004         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1005         struct drm_display_mode *mode = NULL;
1006
1007         cmdline_mode = &fb_helper_conn->cmdline_mode;
1008         if (cmdline_mode->specified == false)
1009                 return mode;
1010
1011         /* attempt to find a matching mode in the list of modes
1012          *  we have gotten so far, if not add a CVT mode that conforms
1013          */
1014         if (cmdline_mode->rb || cmdline_mode->margins)
1015                 goto create_mode;
1016
1017         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1018                 /* check width/height */
1019                 if (mode->hdisplay != cmdline_mode->xres ||
1020                     mode->vdisplay != cmdline_mode->yres)
1021                         continue;
1022
1023                 if (cmdline_mode->refresh_specified) {
1024                         if (mode->vrefresh != cmdline_mode->refresh)
1025                                 continue;
1026                 }
1027
1028                 if (cmdline_mode->interlace) {
1029                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1030                                 continue;
1031                 }
1032                 return mode;
1033         }
1034
1035 create_mode:
1036         mode = drm_cvt_mode(fb_helper_conn->connector->dev, cmdline_mode->xres,
1037                             cmdline_mode->yres,
1038                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1039                             cmdline_mode->rb, cmdline_mode->interlace,
1040                             cmdline_mode->margins);
1041         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1042         list_add(&mode->head, &fb_helper_conn->connector->modes);
1043         return mode;
1044 }
1045
1046 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1047 {
1048         bool enable;
1049
1050         if (strict) {
1051                 enable = connector->status == connector_status_connected;
1052         } else {
1053                 enable = connector->status != connector_status_disconnected;
1054         }
1055         return enable;
1056 }
1057
1058 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1059                                   bool *enabled)
1060 {
1061         bool any_enabled = false;
1062         struct drm_connector *connector;
1063         int i = 0;
1064
1065         for (i = 0; i < fb_helper->connector_count; i++) {
1066                 connector = fb_helper->connector_info[i]->connector;
1067                 enabled[i] = drm_connector_enabled(connector, true);
1068                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1069                           enabled[i] ? "yes" : "no");
1070                 any_enabled |= enabled[i];
1071         }
1072
1073         if (any_enabled)
1074                 return;
1075
1076         for (i = 0; i < fb_helper->connector_count; i++) {
1077                 connector = fb_helper->connector_info[i]->connector;
1078                 enabled[i] = drm_connector_enabled(connector, false);
1079         }
1080 }
1081
1082 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1083                                  struct drm_display_mode **modes,
1084                                  bool *enabled, int width, int height)
1085 {
1086         struct drm_fb_helper_connector *fb_helper_conn;
1087         int i;
1088
1089         for (i = 0; i < fb_helper->connector_count; i++) {
1090                 fb_helper_conn = fb_helper->connector_info[i];
1091
1092                 if (enabled[i] == false)
1093                         continue;
1094
1095                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1096                               fb_helper_conn->connector->base.id);
1097
1098                 /* got for command line mode first */
1099                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1100                 if (!modes[i]) {
1101                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1102                                       fb_helper_conn->connector->base.id);
1103                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1104                 }
1105                 /* No preferred modes, pick one off the list */
1106                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1107                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1108                                 break;
1109                 }
1110                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1111                           "none");
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         struct drm_fb_helper_connector *fb_helper_conn;
1130
1131         if (n == fb_helper->connector_count)
1132                 return 0;
1133
1134         fb_helper_conn = fb_helper->connector_info[n];
1135         connector = fb_helper_conn->connector;
1136
1137         best_crtcs[n] = NULL;
1138         best_crtc = NULL;
1139         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1140         if (modes[n] == NULL)
1141                 return best_score;
1142
1143         crtcs = kzalloc(dev->mode_config.num_connector *
1144                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1145         if (!crtcs)
1146                 return best_score;
1147
1148         my_score = 1;
1149         if (connector->status == connector_status_connected)
1150                 my_score++;
1151         if (drm_has_cmdline_mode(fb_helper_conn))
1152                 my_score++;
1153         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1154                 my_score++;
1155
1156         connector_funcs = connector->helper_private;
1157         encoder = connector_funcs->best_encoder(connector);
1158         if (!encoder)
1159                 goto out;
1160
1161         /* select a crtc for this connector and then attempt to configure
1162            remaining connectors */
1163         for (c = 0; c < fb_helper->crtc_count; c++) {
1164                 crtc = &fb_helper->crtc_info[c];
1165
1166                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1167                         continue;
1168                 }
1169
1170                 for (o = 0; o < n; o++)
1171                         if (best_crtcs[o] == crtc)
1172                                 break;
1173
1174                 if (o < n) {
1175                         /* ignore cloning for now */
1176                         continue;
1177                 }
1178
1179                 crtcs[n] = crtc;
1180                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1181                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1182                                                   width, height);
1183                 if (score > best_score) {
1184                         best_crtc = crtc;
1185                         best_score = score;
1186                         memcpy(best_crtcs, crtcs,
1187                                dev->mode_config.num_connector *
1188                                sizeof(struct drm_fb_helper_crtc *));
1189                 }
1190         }
1191 out:
1192         kfree(crtcs);
1193         return best_score;
1194 }
1195
1196 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1197 {
1198         struct drm_device *dev = fb_helper->dev;
1199         struct drm_fb_helper_crtc **crtcs;
1200         struct drm_display_mode **modes;
1201         struct drm_encoder *encoder;
1202         struct drm_mode_set *modeset;
1203         bool *enabled;
1204         int width, height;
1205         int i, ret;
1206
1207         DRM_DEBUG_KMS("\n");
1208
1209         width = dev->mode_config.max_width;
1210         height = dev->mode_config.max_height;
1211
1212         /* clean out all the encoder/crtc combos */
1213         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1214                 encoder->crtc = NULL;
1215         }
1216
1217         crtcs = kcalloc(dev->mode_config.num_connector,
1218                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1219         modes = kcalloc(dev->mode_config.num_connector,
1220                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1221         enabled = kcalloc(dev->mode_config.num_connector,
1222                           sizeof(bool), GFP_KERNEL);
1223
1224         drm_enable_connectors(fb_helper, enabled);
1225
1226         ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1227         if (!ret)
1228                 DRM_ERROR("Unable to find initial modes\n");
1229
1230         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1231
1232         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1233
1234         /* need to set the modesets up here for use later */
1235         /* fill out the connector<->crtc mappings into the modesets */
1236         for (i = 0; i < fb_helper->crtc_count; i++) {
1237                 modeset = &fb_helper->crtc_info[i].mode_set;
1238                 modeset->num_connectors = 0;
1239         }
1240
1241         for (i = 0; i < fb_helper->connector_count; i++) {
1242                 struct drm_display_mode *mode = modes[i];
1243                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1244                 modeset = &fb_crtc->mode_set;
1245
1246                 if (mode && fb_crtc) {
1247                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1248                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1249                         fb_crtc->desired_mode = mode;
1250                         if (modeset->mode)
1251                                 drm_mode_destroy(dev, modeset->mode);
1252                         modeset->mode = drm_mode_duplicate(dev,
1253                                                            fb_crtc->desired_mode);
1254                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1255                 }
1256         }
1257
1258         kfree(crtcs);
1259         kfree(modes);
1260         kfree(enabled);
1261 }
1262
1263 /**
1264  * drm_helper_initial_config - setup a sane initial connector configuration
1265  * @dev: DRM device
1266  *
1267  * LOCKING:
1268  * Called at init time, must take mode config lock.
1269  *
1270  * Scan the CRTCs and connectors and try to put together an initial setup.
1271  * At the moment, this is a cloned configuration across all heads with
1272  * a new framebuffer object as the backing store.
1273  *
1274  * RETURNS:
1275  * Zero if everything went ok, nonzero otherwise.
1276  */
1277 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1278 {
1279         struct drm_device *dev = fb_helper->dev;
1280         int count = 0;
1281
1282         /* disable all the possible outputs/crtcs before entering KMS mode */
1283         drm_helper_disable_unused_functions(fb_helper->dev);
1284
1285         drm_fb_helper_parse_command_line(fb_helper);
1286
1287         count = drm_fb_helper_probe_connector_modes(fb_helper,
1288                                                     dev->mode_config.max_width,
1289                                                     dev->mode_config.max_height);
1290         /*
1291          * we shouldn't end up with no modes here.
1292          */
1293         if (count == 0) {
1294                 if (fb_helper->poll_enabled) {
1295                         delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work,
1296                                                   5*HZ);
1297                         printk(KERN_INFO "No connectors reported connected with modes - started polling\n");
1298                 } else
1299                         printk(KERN_INFO "No connectors reported connected with modes\n");
1300         }
1301         drm_setup_crtcs(fb_helper);
1302
1303         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1304 }
1305 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1306
1307 /* we got a hotplug irq - need to update fbcon */
1308 void drm_helper_fb_hpd_irq_event(struct drm_fb_helper *fb_helper)
1309 {
1310         /* if we don't have the fbdev registered yet do nothing */
1311         if (!fb_helper->fbdev)
1312                 return;
1313
1314         /* schedule a slow work asap */
1315         delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 0);
1316 }
1317 EXPORT_SYMBOL(drm_helper_fb_hpd_irq_event);
1318
1319 bool drm_helper_fb_hotplug_event(struct drm_fb_helper *fb_helper, bool polled)
1320 {
1321         int count = 0;
1322         int ret;
1323         u32 max_width, max_height, bpp_sel;
1324
1325         if (!fb_helper->fb)
1326                 return false;
1327         DRM_DEBUG_KMS("\n");
1328
1329         max_width = fb_helper->fb->width;
1330         max_height = fb_helper->fb->height;
1331         bpp_sel = fb_helper->fb->bits_per_pixel;
1332
1333         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1334                                                     max_height);
1335         if (fb_helper->poll_enabled && !polled) {
1336                 if (count) {
1337                         delayed_slow_work_cancel(&fb_helper->output_status_change_slow_work);
1338                 } else {
1339                         ret = delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 5*HZ);
1340                 }
1341         }
1342         drm_setup_crtcs(fb_helper);
1343
1344         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1345 }
1346 EXPORT_SYMBOL(drm_helper_fb_hotplug_event);
1347
1348 /*
1349  * delayed work queue execution function
1350  * - check if fbdev is actually in use on the gpu
1351  *   - if not set delayed flag and repoll if necessary
1352  * - check for connector status change
1353  * - repoll if 0 modes found
1354  *- call driver output status changed notifier
1355  */
1356 static void output_status_change_execute(struct slow_work *work)
1357 {
1358         struct delayed_slow_work *delayed_work = container_of(work, struct delayed_slow_work, work);
1359         struct drm_fb_helper *fb_helper = container_of(delayed_work, struct drm_fb_helper, output_status_change_slow_work);
1360         struct drm_connector *connector;
1361         enum drm_connector_status old_status, status;
1362         bool repoll, changed = false;
1363         int ret;
1364         int i;
1365         bool bound = false, crtcs_bound = false;
1366         struct drm_crtc *crtc;
1367
1368         repoll = fb_helper->poll_enabled;
1369
1370         /* first of all check the fbcon framebuffer is actually bound to any crtc */
1371         /* take into account that no crtc at all maybe bound */
1372         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1373                 if (crtc->fb)
1374                         crtcs_bound = true;
1375                 if (crtc->fb == fb_helper->fb)
1376                         bound = true;
1377         }
1378
1379         if (bound == false && crtcs_bound) {
1380                 fb_helper->delayed_hotplug = true;
1381                 goto requeue;
1382         }
1383
1384         for (i = 0; i < fb_helper->connector_count; i++) {
1385                 connector = fb_helper->connector_info[i]->connector;
1386                 old_status = connector->status;
1387                 status = connector->funcs->detect(connector);
1388                 if (old_status != status) {
1389                         changed = true;
1390                 }
1391                 if (status == connector_status_connected && repoll) {
1392                         DRM_DEBUG("%s is connected - stop polling\n", drm_get_connector_name(connector));
1393                         repoll = false;
1394                 }
1395         }
1396
1397         if (changed) {
1398                 if (fb_helper->funcs->fb_output_status_changed)
1399                         fb_helper->funcs->fb_output_status_changed(fb_helper);
1400         }
1401
1402 requeue:
1403         if (repoll) {
1404                 ret = delayed_slow_work_enqueue(delayed_work, 5*HZ);
1405                 if (ret)
1406                         DRM_ERROR("delayed enqueue failed %d\n", ret);
1407         }
1408 }
1409
1410 static struct slow_work_ops output_status_change_ops = {
1411         .execute = output_status_change_execute,
1412 };
1413