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 /* simple single crtc case helper function */
  46 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  47 {
  48         struct drm_device *dev = fb_helper->dev;
  49         struct drm_connector *connector;
  50         int i;
  51
  52         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  53                 struct drm_fb_helper_connector *fb_helper_connector;
  54
  55                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  56                 if (!fb_helper_connector)
  57                         goto fail;
  58
  59                 fb_helper_connector->connector = connector;
  60                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  61         }
  62         return 0;
  63 fail:
  64         for (i = 0; i < fb_helper->connector_count; i++) {
  65                 kfree(fb_helper->connector_info[i]);
  66                 fb_helper->connector_info[i] = NULL;
  67         }
  68         fb_helper->connector_count = 0;
  69         return -ENOMEM;
  70 }
  71 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
  72
  73 /**
  74  * drm_fb_helper_connector_parse_command_line - parse command line for connector
  75  * @connector - connector to parse line for
  76  * @mode_option - per connector mode option
  77  *
  78  * This parses the connector specific then generic command lines for
  79  * modes and options to configure the connector.
  80  *
  81  * This uses the same parameters as the fb modedb.c, except for extra
  82  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
  83  *
  84  * enable/enable Digital/disable bit at the end
  85  */
  86 static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_connector *fb_helper_conn,
  87                                                        const char *mode_option)
  88 {
  89         const char *name;
  90         unsigned int namelen;
  91         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
  92         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
  93         int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
  94         int i;
  95         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
  96         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  97         struct drm_connector *connector = fb_helper_conn->connector;
  98
  99         if (!fb_helper_conn)
 100                 return false;
 101
 102         cmdline_mode = &fb_helper_conn->cmdline_mode;
 103         if (!mode_option)
 104                 mode_option = fb_mode_option;
 105
 106         if (!mode_option) {
 107                 cmdline_mode->specified = false;
 108                 return false;
 109         }
 110
 111         name = mode_option;
 112         namelen = strlen(name);
 113         for (i = namelen-1; i >= 0; i--) {
 114                 switch (name[i]) {
 115                 case '@':
 116                         namelen = i;
 117                         if (!refresh_specified && !bpp_specified &&
 118                             !yres_specified) {
 119                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 120                                 refresh_specified = 1;
 121                                 if (cvt || rb)
 122                                         cvt = 0;
 123                         } else
 124                                 goto done;
 125                         break;
 126                 case '-':
 127                         namelen = i;
 128                         if (!bpp_specified && !yres_specified) {
 129                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 130                                 bpp_specified = 1;
 131                                 if (cvt || rb)
 132                                         cvt = 0;
 133                         } else
 134                                 goto done;
 135                         break;
 136                 case 'x':
 137                         if (!yres_specified) {
 138                                 yres = simple_strtol(&name[i+1], NULL, 10);
 139                                 yres_specified = 1;
 140                         } else
 141                                 goto done;
 142                 case '0' ... '9':
 143                         break;
 144                 case 'M':
 145                         if (!yres_specified)
 146                                 cvt = 1;
 147                         break;
 148                 case 'R':
 149                         if (cvt)
 150                                 rb = 1;
 151                         break;
 152                 case 'm':
 153                         if (!cvt)
 154                                 margins = 1;
 155                         break;
 156                 case 'i':
 157                         if (!cvt)
 158                                 interlace = 1;
 159                         break;
 160                 case 'e':
 161                         force = DRM_FORCE_ON;
 162                         break;
 163                 case 'D':
 164                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 165                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 166                                 force = DRM_FORCE_ON;
 167                         else
 168                                 force = DRM_FORCE_ON_DIGITAL;
 169                         break;
 170                 case 'd':
 171                         force = DRM_FORCE_OFF;
 172                         break;
 173                 default:
 174                         goto done;
 175                 }
 176         }
 177         if (i < 0 && yres_specified) {
 178                 xres = simple_strtol(name, NULL, 10);
 179                 res_specified = 1;
 180         }
 181 done:
 182
 183         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 184                 drm_get_connector_name(connector), xres, yres,
 185                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 186                 "", (margins) ? " with margins" : "", (interlace) ?
 187                 " interlaced" : "");
 188
 189         if (force) {
 190                 const char *s;
 191                 switch (force) {
 192                 case DRM_FORCE_OFF: s = "OFF"; break;
 193                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 194                 default:
 195                 case DRM_FORCE_ON: s = "ON"; break;
 196                 }
 197
 198                 DRM_INFO("forcing %s connector %s\n",
 199                          drm_get_connector_name(connector), s);
 200                 connector->force = force;
 201         }
 202
 203         if (res_specified) {
 204                 cmdline_mode->specified = true;
 205                 cmdline_mode->xres = xres;
 206                 cmdline_mode->yres = yres;
 207         }
 208
 209         if (refresh_specified) {
 210                 cmdline_mode->refresh_specified = true;
 211                 cmdline_mode->refresh = refresh;
 212         }
 213
 214         if (bpp_specified) {
 215                 cmdline_mode->bpp_specified = true;
 216                 cmdline_mode->bpp = bpp;
 217         }
 218         cmdline_mode->rb = rb ? true : false;
 219         cmdline_mode->cvt = cvt  ? true : false;
 220         cmdline_mode->interlace = interlace ? true : false;
 221
 222         return true;
 223 }
 224
 225 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 226 {
 227         struct drm_fb_helper_connector *fb_helper_conn;
 228         int i;
 229
 230         for (i = 0; i < fb_helper->connector_count; i++) {
 231                 char *option = NULL;
 232
 233                 fb_helper_conn = fb_helper->connector_info[i];
 234
 235                 /* do something on return - turn off connector maybe */
 236                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
 237                         continue;
 238
 239                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
 240         }
 241         return 0;
 242 }
 243
 244 bool drm_fb_helper_force_kernel_mode(void)
 245 {
 246         int i = 0;
 247         bool ret, error = false;
 248         struct drm_fb_helper *helper;
 249
 250         if (list_empty(&kernel_fb_helper_list))
 251                 return false;
 252
 253         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 254                 for (i = 0; i < helper->crtc_count; i++) {
 255                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 256                         ret = drm_crtc_helper_set_config(mode_set);
 257                         if (ret)
 258                                 error = true;
 259                 }
 260         }
 261         return error;
 262 }
 263
 264 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 265                         void *panic_str)
 266 {
 267         printk(KERN_ERR "panic occurred, switching back to text console\n");
 268         return drm_fb_helper_force_kernel_mode();
 269         return 0;
 270 }
 271 EXPORT_SYMBOL(drm_fb_helper_panic);
 272
 273 static struct notifier_block paniced = {
 274         .notifier_call = drm_fb_helper_panic,
 275 };
 276
 277 /**
 278  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 279  *
 280  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 281  */
 282 void drm_fb_helper_restore(void)
 283 {
 284         bool ret;
 285         ret = drm_fb_helper_force_kernel_mode();
 286         if (ret == true)
 287                 DRM_ERROR("Failed to restore crtc configuration\n");
 288 }
 289 EXPORT_SYMBOL(drm_fb_helper_restore);
 290
 291 #ifdef CONFIG_MAGIC_SYSRQ
 292 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 293 {
 294         drm_fb_helper_restore();
 295 }
 296 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 297
 298 static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
 299 {
 300         schedule_work(&drm_fb_helper_restore_work);
 301 }
 302
 303 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 304         .handler = drm_fb_helper_sysrq,
 305         .help_msg = "force-fb(V)",
 306         .action_msg = "Restore framebuffer console",
 307 };
 308 #else
 309 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 310 #endif
 311
 312 static void drm_fb_helper_on(struct fb_info *info)
 313 {
 314         struct drm_fb_helper *fb_helper = info->par;
 315         struct drm_device *dev = fb_helper->dev;
 316         struct drm_crtc *crtc;
 317         struct drm_crtc_helper_funcs *crtc_funcs;
 318         struct drm_connector *connector;
 319         struct drm_encoder *encoder;
 320         int i, j;
 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                 /* Walk the connectors & encoders on this fb turning them on */
 337                 for (j = 0; j < fb_helper->connector_count; j++) {
 338                         connector = fb_helper->connector_info[j]->connector;
 339                         connector->dpms = DRM_MODE_DPMS_ON;
 340                         drm_connector_property_set_value(connector,
 341                                                          dev->mode_config.dpms_property,
 342                                                          DRM_MODE_DPMS_ON);
 343                 }
 344                 /* Found a CRTC on this fb, now find encoders */
 345                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 346                         if (encoder->crtc == crtc) {
 347                                 struct drm_encoder_helper_funcs *encoder_funcs;
 348
 349                                 encoder_funcs = encoder->helper_private;
 350                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 351                         }
 352                 }
 353         }
 354         mutex_unlock(&dev->mode_config.mutex);
 355 }
 356
 357 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 358 {
 359         struct drm_fb_helper *fb_helper = info->par;
 360         struct drm_device *dev = fb_helper->dev;
 361         struct drm_crtc *crtc;
 362         struct drm_crtc_helper_funcs *crtc_funcs;
 363         struct drm_connector *connector;
 364         struct drm_encoder *encoder;
 365         int i, j;
 366
 367         /*
 368          * For each CRTC in this fb, find all associated encoders
 369          * and turn them off, then turn off the CRTC.
 370          */
 371         mutex_lock(&dev->mode_config.mutex);
 372         for (i = 0; i < fb_helper->crtc_count; i++) {
 373                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 374                 crtc_funcs = crtc->helper_private;
 375
 376                 if (!crtc->enabled)
 377                         continue;
 378
 379                 /* Walk the connectors on this fb and mark them off */
 380                 for (j = 0; j < fb_helper->connector_count; j++) {
 381                         connector = fb_helper->connector_info[j]->connector;
 382                         connector->dpms = dpms_mode;
 383                         drm_connector_property_set_value(connector,
 384                                                          dev->mode_config.dpms_property,
 385                                                          dpms_mode);
 386                 }
 387                 /* Found a CRTC on this fb, now find encoders */
 388                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 389                         if (encoder->crtc == crtc) {
 390                                 struct drm_encoder_helper_funcs *encoder_funcs;
 391
 392                                 encoder_funcs = encoder->helper_private;
 393                                 encoder_funcs->dpms(encoder, dpms_mode);
 394                         }
 395                 }
 396                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 397         }
 398         mutex_unlock(&dev->mode_config.mutex);
 399 }
 400
 401 int drm_fb_helper_blank(int blank, struct fb_info *info)
 402 {
 403         switch (blank) {
 404         /* Display: On; HSync: On, VSync: On */
 405         case FB_BLANK_UNBLANK:
 406                 drm_fb_helper_on(info);
 407                 break;
 408         /* Display: Off; HSync: On, VSync: On */
 409         case FB_BLANK_NORMAL:
 410                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 411                 break;
 412         /* Display: Off; HSync: Off, VSync: On */
 413         case FB_BLANK_HSYNC_SUSPEND:
 414                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 415                 break;
 416         /* Display: Off; HSync: On, VSync: Off */
 417         case FB_BLANK_VSYNC_SUSPEND:
 418                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 419                 break;
 420         /* Display: Off; HSync: Off, VSync: Off */
 421         case FB_BLANK_POWERDOWN:
 422                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 423                 break;
 424         }
 425         return 0;
 426 }
 427 EXPORT_SYMBOL(drm_fb_helper_blank);
 428
 429 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 430 {
 431         int i;
 432
 433         for (i = 0; i < helper->connector_count; i++)
 434                 kfree(helper->connector_info[i]);
 435         kfree(helper->connector_info);
 436         for (i = 0; i < helper->crtc_count; i++)
 437                 kfree(helper->crtc_info[i].mode_set.connectors);
 438         kfree(helper->crtc_info);
 439 }
 440
 441 int drm_fb_helper_init(struct drm_device *dev,
 442                        struct drm_fb_helper *fb_helper,
 443                        int crtc_count, int max_conn_count)
 444 {
 445         struct drm_crtc *crtc;
 446         int ret = 0;
 447         int i;
 448
 449         fb_helper->dev = dev;
 450
 451         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 452
 453         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 454         if (!fb_helper->crtc_info)
 455                 return -ENOMEM;
 456
 457         fb_helper->crtc_count = crtc_count;
 458         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 459         if (!fb_helper->connector_info) {
 460                 kfree(fb_helper->crtc_info);
 461                 return -ENOMEM;
 462         }
 463         fb_helper->connector_count = 0;
 464
 465         for (i = 0; i < crtc_count; i++) {
 466                 fb_helper->crtc_info[i].mode_set.connectors =
 467                         kcalloc(max_conn_count,
 468                                 sizeof(struct drm_connector *),
 469                                 GFP_KERNEL);
 470
 471                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 472                         ret = -ENOMEM;
 473                         goto out_free;
 474                 }
 475                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 476         }
 477
 478         i = 0;
 479         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 480                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 481                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 482                 i++;
 483         }
 484         fb_helper->conn_limit = max_conn_count;
 485         return 0;
 486 out_free:
 487         drm_fb_helper_crtc_free(fb_helper);
 488         return -ENOMEM;
 489 }
 490 EXPORT_SYMBOL(drm_fb_helper_init);
 491
 492 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 493 {
 494         if (!list_empty(&fb_helper->kernel_fb_list)) {
 495                 list_del(&fb_helper->kernel_fb_list);
 496                 if (list_empty(&kernel_fb_helper_list)) {
 497                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 498                         atomic_notifier_chain_unregister(&panic_notifier_list,
 499                                                          &paniced);
 500                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 501                 }
 502         }
 503
 504         drm_fb_helper_crtc_free(fb_helper);
 505
 506 }
 507 EXPORT_SYMBOL(drm_fb_helper_fini);
 508
 509 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 510                      u16 blue, u16 regno, struct fb_info *info)
 511 {
 512         struct drm_fb_helper *fb_helper = info->par;
 513         struct drm_framebuffer *fb = fb_helper->fb;
 514         int pindex;
 515
 516         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 517                 u32 *palette;
 518                 u32 value;
 519                 /* place color in psuedopalette */
 520                 if (regno > 16)
 521                         return -EINVAL;
 522                 palette = (u32 *)info->pseudo_palette;
 523                 red >>= (16 - info->var.red.length);
 524                 green >>= (16 - info->var.green.length);
 525                 blue >>= (16 - info->var.blue.length);
 526                 value = (red << info->var.red.offset) |
 527                         (green << info->var.green.offset) |
 528                         (blue << info->var.blue.offset);
 529                 palette[regno] = value;
 530                 return 0;
 531         }
 532
 533         pindex = regno;
 534
 535         if (fb->bits_per_pixel == 16) {
 536                 pindex = regno << 3;
 537
 538                 if (fb->depth == 16 && regno > 63)
 539                         return -EINVAL;
 540                 if (fb->depth == 15 && regno > 31)
 541                         return -EINVAL;
 542
 543                 if (fb->depth == 16) {
 544                         u16 r, g, b;
 545                         int i;
 546                         if (regno < 32) {
 547                                 for (i = 0; i < 8; i++)
 548                                         fb_helper->funcs->gamma_set(crtc, red,
 549                                                 green, blue, pindex + i);
 550                         }
 551
 552                         fb_helper->funcs->gamma_get(crtc, &r,
 553                                                     &g, &b,
 554                                                     pindex >> 1);
 555
 556                         for (i = 0; i < 4; i++)
 557                                 fb_helper->funcs->gamma_set(crtc, r,
 558                                                             green, b,
 559                                                             (pindex >> 1) + i);
 560                 }
 561         }
 562
 563         if (fb->depth != 16)
 564                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 565         return 0;
 566 }
 567
 568 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 569 {
 570         struct drm_fb_helper *fb_helper = info->par;
 571         struct drm_crtc_helper_funcs *crtc_funcs;
 572         u16 *red, *green, *blue, *transp;
 573         struct drm_crtc *crtc;
 574         int i, rc = 0;
 575         int start;
 576
 577         for (i = 0; i < fb_helper->crtc_count; i++) {
 578                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 579                 crtc_funcs = crtc->helper_private;
 580
 581                 red = cmap->red;
 582                 green = cmap->green;
 583                 blue = cmap->blue;
 584                 transp = cmap->transp;
 585                 start = cmap->start;
 586
 587                 for (i = 0; i < cmap->len; i++) {
 588                         u16 hred, hgreen, hblue, htransp = 0xffff;
 589
 590                         hred = *red++;
 591                         hgreen = *green++;
 592                         hblue = *blue++;
 593
 594                         if (transp)
 595                                 htransp = *transp++;
 596
 597                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 598                         if (rc)
 599                                 return rc;
 600                 }
 601                 crtc_funcs->load_lut(crtc);
 602         }
 603         return rc;
 604 }
 605 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 606
 607 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 608                             struct fb_info *info)
 609 {
 610         struct drm_fb_helper *fb_helper = info->par;
 611         struct drm_framebuffer *fb = fb_helper->fb;
 612         int depth;
 613
 614         if (var->pixclock != 0)
 615                 return -EINVAL;
 616
 617         /* Need to resize the fb object !!! */
 618         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 619                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 620                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 621                           fb->width, fb->height, fb->bits_per_pixel);
 622                 return -EINVAL;
 623         }
 624
 625         switch (var->bits_per_pixel) {
 626         case 16:
 627                 depth = (var->green.length == 6) ? 16 : 15;
 628                 break;
 629         case 32:
 630                 depth = (var->transp.length > 0) ? 32 : 24;
 631                 break;
 632         default:
 633                 depth = var->bits_per_pixel;
 634                 break;
 635         }
 636
 637         switch (depth) {
 638         case 8:
 639                 var->red.offset = 0;
 640                 var->green.offset = 0;
 641                 var->blue.offset = 0;
 642                 var->red.length = 8;
 643                 var->green.length = 8;
 644                 var->blue.length = 8;
 645                 var->transp.length = 0;
 646                 var->transp.offset = 0;
 647                 break;
 648         case 15:
 649                 var->red.offset = 10;
 650                 var->green.offset = 5;
 651                 var->blue.offset = 0;
 652                 var->red.length = 5;
 653                 var->green.length = 5;
 654                 var->blue.length = 5;
 655                 var->transp.length = 1;
 656                 var->transp.offset = 15;
 657                 break;
 658         case 16:
 659                 var->red.offset = 11;
 660                 var->green.offset = 5;
 661                 var->blue.offset = 0;
 662                 var->red.length = 5;
 663                 var->green.length = 6;
 664                 var->blue.length = 5;
 665                 var->transp.length = 0;
 666                 var->transp.offset = 0;
 667                 break;
 668         case 24:
 669                 var->red.offset = 16;
 670                 var->green.offset = 8;
 671                 var->blue.offset = 0;
 672                 var->red.length = 8;
 673                 var->green.length = 8;
 674                 var->blue.length = 8;
 675                 var->transp.length = 0;
 676                 var->transp.offset = 0;
 677                 break;
 678         case 32:
 679                 var->red.offset = 16;
 680                 var->green.offset = 8;
 681                 var->blue.offset = 0;
 682                 var->red.length = 8;
 683                 var->green.length = 8;
 684                 var->blue.length = 8;
 685                 var->transp.length = 8;
 686                 var->transp.offset = 24;
 687                 break;
 688         default:
 689                 return -EINVAL;
 690         }
 691         return 0;
 692 }
 693 EXPORT_SYMBOL(drm_fb_helper_check_var);
 694
 695 /* this will let fbcon do the mode init */
 696 int drm_fb_helper_set_par(struct fb_info *info)
 697 {
 698         struct drm_fb_helper *fb_helper = info->par;
 699         struct drm_device *dev = fb_helper->dev;
 700         struct fb_var_screeninfo *var = &info->var;
 701         struct drm_crtc *crtc;
 702         int ret;
 703         int i;
 704
 705         if (var->pixclock != 0) {
 706                 DRM_ERROR("PIXEL CLOCK SET\n");
 707                 return -EINVAL;
 708         }
 709
 710         mutex_lock(&dev->mode_config.mutex);
 711         for (i = 0; i < fb_helper->crtc_count; i++) {
 712                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 713                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 714                 if (ret) {
 715                         mutex_unlock(&dev->mode_config.mutex);
 716                         return ret;
 717                 }
 718         }
 719         mutex_unlock(&dev->mode_config.mutex);
 720
 721         if (fb_helper->delayed_hotplug) {
 722                 fb_helper->delayed_hotplug = false;
 723                 drm_fb_helper_hotplug_event(fb_helper);
 724         }
 725         return 0;
 726 }
 727 EXPORT_SYMBOL(drm_fb_helper_set_par);
 728
 729 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 730                               struct fb_info *info)
 731 {
 732         struct drm_fb_helper *fb_helper = info->par;
 733         struct drm_device *dev = fb_helper->dev;
 734         struct drm_mode_set *modeset;
 735         struct drm_crtc *crtc;
 736         int ret = 0;
 737         int i;
 738
 739         mutex_lock(&dev->mode_config.mutex);
 740         for (i = 0; i < fb_helper->crtc_count; i++) {
 741                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 742
 743                 modeset = &fb_helper->crtc_info[i].mode_set;
 744
 745                 modeset->x = var->xoffset;
 746                 modeset->y = var->yoffset;
 747
 748                 if (modeset->num_connectors) {
 749                         ret = crtc->funcs->set_config(modeset);
 750                         if (!ret) {
 751                                 info->var.xoffset = var->xoffset;
 752                                 info->var.yoffset = var->yoffset;
 753                         }
 754                 }
 755         }
 756         mutex_unlock(&dev->mode_config.mutex);
 757         return ret;
 758 }
 759 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 760
 761 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 762                                   int preferred_bpp)
 763 {
 764         int new_fb = 0;
 765         int crtc_count = 0;
 766         int i;
 767         struct fb_info *info;
 768         struct drm_fb_helper_surface_size sizes;
 769         int gamma_size = 0;
 770
 771         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 772         sizes.surface_depth = 24;
 773         sizes.surface_bpp = 32;
 774         sizes.fb_width = (unsigned)-1;
 775         sizes.fb_height = (unsigned)-1;
 776
 777         /* if driver picks 8 or 16 by default use that
 778            for both depth/bpp */
 779         if (preferred_bpp != sizes.surface_bpp) {
 780                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 781         }
 782         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 783         for (i = 0; i < fb_helper->connector_count; i++) {
 784                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 785                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 786
 787                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 788
 789                 if (cmdline_mode->bpp_specified) {
 790                         switch (cmdline_mode->bpp) {
 791                         case 8:
 792                                 sizes.surface_depth = sizes.surface_bpp = 8;
 793                                 break;
 794                         case 15:
 795                                 sizes.surface_depth = 15;
 796                                 sizes.surface_bpp = 16;
 797                                 break;
 798                         case 16:
 799                                 sizes.surface_depth = sizes.surface_bpp = 16;
 800                                 break;
 801                         case 24:
 802                                 sizes.surface_depth = sizes.surface_bpp = 24;
 803                                 break;
 804                         case 32:
 805                                 sizes.surface_depth = 24;
 806                                 sizes.surface_bpp = 32;
 807                                 break;
 808                         }
 809                         break;
 810                 }
 811         }
 812
 813         crtc_count = 0;
 814         for (i = 0; i < fb_helper->crtc_count; i++) {
 815                 struct drm_display_mode *desired_mode;
 816                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 817
 818                 if (desired_mode) {
 819                         if (gamma_size == 0)
 820                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 821                         if (desired_mode->hdisplay < sizes.fb_width)
 822                                 sizes.fb_width = desired_mode->hdisplay;
 823                         if (desired_mode->vdisplay < sizes.fb_height)
 824                                 sizes.fb_height = desired_mode->vdisplay;
 825                         if (desired_mode->hdisplay > sizes.surface_width)
 826                                 sizes.surface_width = desired_mode->hdisplay;
 827                         if (desired_mode->vdisplay > sizes.surface_height)
 828                                 sizes.surface_height = desired_mode->vdisplay;
 829                         crtc_count++;
 830                 }
 831         }
 832
 833         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 834                 /* hmm everyone went away - assume VGA cable just fell out
 835                    and will come back later. */
 836                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 837                 sizes.fb_width = sizes.surface_width = 1024;
 838                 sizes.fb_height = sizes.surface_height = 768;
 839         }
 840
 841         /* push down into drivers */
 842         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 843         if (new_fb < 0)
 844                 return new_fb;
 845
 846         info = fb_helper->fbdev;
 847
 848         /* set the fb pointer */
 849         for (i = 0; i < fb_helper->crtc_count; i++) {
 850                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 851         }
 852
 853         if (new_fb) {
 854                 info->var.pixclock = 0;
 855                 if (register_framebuffer(info) < 0) {
 856                         return -EINVAL;
 857                 }
 858
 859                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 860                        info->fix.id);
 861
 862         } else {
 863                 drm_fb_helper_set_par(info);
 864         }
 865
 866         /* Switch back to kernel console on panic */
 867         /* multi card linked list maybe */
 868         if (list_empty(&kernel_fb_helper_list)) {
 869                 printk(KERN_INFO "drm: registered panic notifier\n");
 870                 atomic_notifier_chain_register(&panic_notifier_list,
 871                                                &paniced);
 872                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 873         }
 874         if (new_fb)
 875                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 876
 877         return 0;
 878 }
 879 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 880
 881 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 882                             uint32_t depth)
 883 {
 884         info->fix.type = FB_TYPE_PACKED_PIXELS;
 885         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 886                 FB_VISUAL_TRUECOLOR;
 887         info->fix.type_aux = 0;
 888         info->fix.xpanstep = 1; /* doing it in hw */
 889         info->fix.ypanstep = 1; /* doing it in hw */
 890         info->fix.ywrapstep = 0;
 891         info->fix.accel = FB_ACCEL_NONE;
 892         info->fix.type_aux = 0;
 893
 894         info->fix.line_length = pitch;
 895         return;
 896 }
 897 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 898
 899 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 900                             uint32_t fb_width, uint32_t fb_height)
 901 {
 902         struct drm_framebuffer *fb = fb_helper->fb;
 903         info->pseudo_palette = fb_helper->pseudo_palette;
 904         info->var.xres_virtual = fb->width;
 905         info->var.yres_virtual = fb->height;
 906         info->var.bits_per_pixel = fb->bits_per_pixel;
 907         info->var.xoffset = 0;
 908         info->var.yoffset = 0;
 909         info->var.activate = FB_ACTIVATE_NOW;
 910         info->var.height = -1;
 911         info->var.width = -1;
 912
 913         switch (fb->depth) {
 914         case 8:
 915                 info->var.red.offset = 0;
 916                 info->var.green.offset = 0;
 917                 info->var.blue.offset = 0;
 918                 info->var.red.length = 8; /* 8bit DAC */
 919                 info->var.green.length = 8;
 920                 info->var.blue.length = 8;
 921                 info->var.transp.offset = 0;
 922                 info->var.transp.length = 0;
 923                 break;
 924         case 15:
 925                 info->var.red.offset = 10;
 926                 info->var.green.offset = 5;
 927                 info->var.blue.offset = 0;
 928                 info->var.red.length = 5;
 929                 info->var.green.length = 5;
 930                 info->var.blue.length = 5;
 931                 info->var.transp.offset = 15;
 932                 info->var.transp.length = 1;
 933                 break;
 934         case 16:
 935                 info->var.red.offset = 11;
 936                 info->var.green.offset = 5;
 937                 info->var.blue.offset = 0;
 938                 info->var.red.length = 5;
 939                 info->var.green.length = 6;
 940                 info->var.blue.length = 5;
 941                 info->var.transp.offset = 0;
 942                 break;
 943         case 24:
 944                 info->var.red.offset = 16;
 945                 info->var.green.offset = 8;
 946                 info->var.blue.offset = 0;
 947                 info->var.red.length = 8;
 948                 info->var.green.length = 8;
 949                 info->var.blue.length = 8;
 950                 info->var.transp.offset = 0;
 951                 info->var.transp.length = 0;
 952                 break;
 953         case 32:
 954                 info->var.red.offset = 16;
 955                 info->var.green.offset = 8;
 956                 info->var.blue.offset = 0;
 957                 info->var.red.length = 8;
 958                 info->var.green.length = 8;
 959                 info->var.blue.length = 8;
 960                 info->var.transp.offset = 24;
 961                 info->var.transp.length = 8;
 962                 break;
 963         default:
 964                 break;
 965         }
 966
 967         info->var.xres = fb_width;
 968         info->var.yres = fb_height;
 969 }
 970 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 971
 972 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 973                                                uint32_t maxX,
 974                                                uint32_t maxY)
 975 {
 976         struct drm_connector *connector;
 977         int count = 0;
 978         int i;
 979
 980         for (i = 0; i < fb_helper->connector_count; i++) {
 981                 connector = fb_helper->connector_info[i]->connector;
 982                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 983         }
 984
 985         return count;
 986 }
 987
 988 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
 989 {
 990         struct drm_display_mode *mode;
 991
 992         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
 993                 if (drm_mode_width(mode) > width ||
 994                     drm_mode_height(mode) > height)
 995                         continue;
 996                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 997                         return mode;
 998         }
 999         return NULL;
1000 }
1001
1002 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1003 {
1004         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1005         cmdline_mode = &fb_connector->cmdline_mode;
1006         return cmdline_mode->specified;
1007 }
1008
1009 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1010                                                       int width, int height)
1011 {
1012         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1013         struct drm_display_mode *mode = NULL;
1014
1015         cmdline_mode = &fb_helper_conn->cmdline_mode;
1016         if (cmdline_mode->specified == false)
1017                 return mode;
1018
1019         /* attempt to find a matching mode in the list of modes
1020          *  we have gotten so far, if not add a CVT mode that conforms
1021          */
1022         if (cmdline_mode->rb || cmdline_mode->margins)
1023                 goto create_mode;
1024
1025         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1026                 /* check width/height */
1027                 if (mode->hdisplay != cmdline_mode->xres ||
1028                     mode->vdisplay != cmdline_mode->yres)
1029                         continue;
1030
1031                 if (cmdline_mode->refresh_specified) {
1032                         if (mode->vrefresh != cmdline_mode->refresh)
1033                                 continue;
1034                 }
1035
1036                 if (cmdline_mode->interlace) {
1037                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1038                                 continue;
1039                 }
1040                 return mode;
1041         }
1042
1043 create_mode:
1044         if (cmdline_mode->cvt)
1045                 mode = drm_cvt_mode(fb_helper_conn->connector->dev,
1046                                     cmdline_mode->xres, cmdline_mode->yres,
1047                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1048                                     cmdline_mode->rb, cmdline_mode->interlace,
1049                                     cmdline_mode->margins);
1050         else
1051                 mode = drm_gtf_mode(fb_helper_conn->connector->dev,
1052                                     cmdline_mode->xres, cmdline_mode->yres,
1053                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1054                                     cmdline_mode->interlace,
1055                                     cmdline_mode->margins);
1056         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1057         list_add(&mode->head, &fb_helper_conn->connector->modes);
1058         return mode;
1059 }
1060
1061 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1062 {
1063         bool enable;
1064
1065         if (strict) {
1066                 enable = connector->status == connector_status_connected;
1067         } else {
1068                 enable = connector->status != connector_status_disconnected;
1069         }
1070         return enable;
1071 }
1072
1073 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1074                                   bool *enabled)
1075 {
1076         bool any_enabled = false;
1077         struct drm_connector *connector;
1078         int i = 0;
1079
1080         for (i = 0; i < fb_helper->connector_count; i++) {
1081                 connector = fb_helper->connector_info[i]->connector;
1082                 enabled[i] = drm_connector_enabled(connector, true);
1083                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1084                           enabled[i] ? "yes" : "no");
1085                 any_enabled |= enabled[i];
1086         }
1087
1088         if (any_enabled)
1089                 return;
1090
1091         for (i = 0; i < fb_helper->connector_count; i++) {
1092                 connector = fb_helper->connector_info[i]->connector;
1093                 enabled[i] = drm_connector_enabled(connector, false);
1094         }
1095 }
1096
1097 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1098                               struct drm_display_mode **modes,
1099                               bool *enabled, int width, int height)
1100 {
1101         int count, i, j;
1102         bool can_clone = false;
1103         struct drm_fb_helper_connector *fb_helper_conn;
1104         struct drm_display_mode *dmt_mode, *mode;
1105
1106         /* only contemplate cloning in the single crtc case */
1107         if (fb_helper->crtc_count > 1)
1108                 return false;
1109
1110         count = 0;
1111         for (i = 0; i < fb_helper->connector_count; i++) {
1112                 if (enabled[i])
1113                         count++;
1114         }
1115
1116         /* only contemplate cloning if more than one connector is enabled */
1117         if (count <= 1)
1118                 return false;
1119
1120         /* check the command line or if nothing common pick 1024x768 */
1121         can_clone = true;
1122         for (i = 0; i < fb_helper->connector_count; i++) {
1123                 if (!enabled[i])
1124                         continue;
1125                 fb_helper_conn = fb_helper->connector_info[i];
1126                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1127                 if (!modes[i]) {
1128                         can_clone = false;
1129                         break;
1130                 }
1131                 for (j = 0; j < i; j++) {
1132                         if (!enabled[j])
1133                                 continue;
1134                         if (!drm_mode_equal(modes[j], modes[i]))
1135                                 can_clone = false;
1136                 }
1137         }
1138
1139         if (can_clone) {
1140                 DRM_DEBUG_KMS("can clone using command line\n");
1141                 return true;
1142         }
1143
1144         /* try and find a 1024x768 mode on each connector */
1145         can_clone = true;
1146         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1147
1148         for (i = 0; i < fb_helper->connector_count; i++) {
1149
1150                 if (!enabled[i])
1151                         continue;
1152
1153                 fb_helper_conn = fb_helper->connector_info[i];
1154                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1155                         if (drm_mode_equal(mode, dmt_mode))
1156                                 modes[i] = mode;
1157                 }
1158                 if (!modes[i])
1159                         can_clone = false;
1160         }
1161
1162         if (can_clone) {
1163                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1164                 return true;
1165         }
1166         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1167         return false;
1168 }
1169
1170 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1171                                  struct drm_display_mode **modes,
1172                                  bool *enabled, int width, int height)
1173 {
1174         struct drm_fb_helper_connector *fb_helper_conn;
1175         int i;
1176
1177         for (i = 0; i < fb_helper->connector_count; i++) {
1178                 fb_helper_conn = fb_helper->connector_info[i];
1179
1180                 if (enabled[i] == false)
1181                         continue;
1182
1183                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1184                               fb_helper_conn->connector->base.id);
1185
1186                 /* got for command line mode first */
1187                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1188                 if (!modes[i]) {
1189                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1190                                       fb_helper_conn->connector->base.id);
1191                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1192                 }
1193                 /* No preferred modes, pick one off the list */
1194                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1195                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1196                                 break;
1197                 }
1198                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1199                           "none");
1200         }
1201         return true;
1202 }
1203
1204 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1205                           struct drm_fb_helper_crtc **best_crtcs,
1206                           struct drm_display_mode **modes,
1207                           int n, int width, int height)
1208 {
1209         int c, o;
1210         struct drm_device *dev = fb_helper->dev;
1211         struct drm_connector *connector;
1212         struct drm_connector_helper_funcs *connector_funcs;
1213         struct drm_encoder *encoder;
1214         struct drm_fb_helper_crtc *best_crtc;
1215         int my_score, best_score, score;
1216         struct drm_fb_helper_crtc **crtcs, *crtc;
1217         struct drm_fb_helper_connector *fb_helper_conn;
1218
1219         if (n == fb_helper->connector_count)
1220                 return 0;
1221
1222         fb_helper_conn = fb_helper->connector_info[n];
1223         connector = fb_helper_conn->connector;
1224
1225         best_crtcs[n] = NULL;
1226         best_crtc = NULL;
1227         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1228         if (modes[n] == NULL)
1229                 return best_score;
1230
1231         crtcs = kzalloc(dev->mode_config.num_connector *
1232                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1233         if (!crtcs)
1234                 return best_score;
1235
1236         my_score = 1;
1237         if (connector->status == connector_status_connected)
1238                 my_score++;
1239         if (drm_has_cmdline_mode(fb_helper_conn))
1240                 my_score++;
1241         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1242                 my_score++;
1243
1244         connector_funcs = connector->helper_private;
1245         encoder = connector_funcs->best_encoder(connector);
1246         if (!encoder)
1247                 goto out;
1248
1249         /* select a crtc for this connector and then attempt to configure
1250            remaining connectors */
1251         for (c = 0; c < fb_helper->crtc_count; c++) {
1252                 crtc = &fb_helper->crtc_info[c];
1253
1254                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1255                         continue;
1256                 }
1257
1258                 for (o = 0; o < n; o++)
1259                         if (best_crtcs[o] == crtc)
1260                                 break;
1261
1262                 if (o < n) {
1263                         /* ignore cloning unless only a single crtc */
1264                         if (fb_helper->crtc_count > 1)
1265                                 continue;
1266
1267                         if (!drm_mode_equal(modes[o], modes[n]))
1268                                 continue;
1269                 }
1270
1271                 crtcs[n] = crtc;
1272                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1273                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1274                                                   width, height);
1275                 if (score > best_score) {
1276                         best_crtc = crtc;
1277                         best_score = score;
1278                         memcpy(best_crtcs, crtcs,
1279                                dev->mode_config.num_connector *
1280                                sizeof(struct drm_fb_helper_crtc *));
1281                 }
1282         }
1283 out:
1284         kfree(crtcs);
1285         return best_score;
1286 }
1287
1288 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1289 {
1290         struct drm_device *dev = fb_helper->dev;
1291         struct drm_fb_helper_crtc **crtcs;
1292         struct drm_display_mode **modes;
1293         struct drm_encoder *encoder;
1294         struct drm_mode_set *modeset;
1295         bool *enabled;
1296         int width, height;
1297         int i, ret;
1298
1299         DRM_DEBUG_KMS("\n");
1300
1301         width = dev->mode_config.max_width;
1302         height = dev->mode_config.max_height;
1303
1304         /* clean out all the encoder/crtc combos */
1305         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1306                 encoder->crtc = NULL;
1307         }
1308
1309         crtcs = kcalloc(dev->mode_config.num_connector,
1310                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1311         modes = kcalloc(dev->mode_config.num_connector,
1312                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1313         enabled = kcalloc(dev->mode_config.num_connector,
1314                           sizeof(bool), GFP_KERNEL);
1315
1316         drm_enable_connectors(fb_helper, enabled);
1317
1318         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1319         if (!ret) {
1320                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1321                 if (!ret)
1322                         DRM_ERROR("Unable to find initial modes\n");
1323         }
1324
1325         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1326
1327         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1328
1329         /* need to set the modesets up here for use later */
1330         /* fill out the connector<->crtc mappings into the modesets */
1331         for (i = 0; i < fb_helper->crtc_count; i++) {
1332                 modeset = &fb_helper->crtc_info[i].mode_set;
1333                 modeset->num_connectors = 0;
1334         }
1335
1336         for (i = 0; i < fb_helper->connector_count; i++) {
1337                 struct drm_display_mode *mode = modes[i];
1338                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1339                 modeset = &fb_crtc->mode_set;
1340
1341                 if (mode && fb_crtc) {
1342                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1343                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1344                         fb_crtc->desired_mode = mode;
1345                         if (modeset->mode)
1346                                 drm_mode_destroy(dev, modeset->mode);
1347                         modeset->mode = drm_mode_duplicate(dev,
1348                                                            fb_crtc->desired_mode);
1349                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1350                 }
1351         }
1352
1353         kfree(crtcs);
1354         kfree(modes);
1355         kfree(enabled);
1356 }
1357
1358 /**
1359  * drm_helper_initial_config - setup a sane initial connector configuration
1360  * @dev: DRM device
1361  *
1362  * LOCKING:
1363  * Called at init time, must take mode config lock.
1364  *
1365  * Scan the CRTCs and connectors and try to put together an initial setup.
1366  * At the moment, this is a cloned configuration across all heads with
1367  * a new framebuffer object as the backing store.
1368  *
1369  * RETURNS:
1370  * Zero if everything went ok, nonzero otherwise.
1371  */
1372 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1373 {
1374         struct drm_device *dev = fb_helper->dev;
1375         int count = 0;
1376
1377         /* disable all the possible outputs/crtcs before entering KMS mode */
1378         drm_helper_disable_unused_functions(fb_helper->dev);
1379
1380         drm_fb_helper_parse_command_line(fb_helper);
1381
1382         count = drm_fb_helper_probe_connector_modes(fb_helper,
1383                                                     dev->mode_config.max_width,
1384                                                     dev->mode_config.max_height);
1385         /*
1386          * we shouldn't end up with no modes here.
1387          */
1388         if (count == 0) {
1389                 printk(KERN_INFO "No connectors reported connected with modes\n");
1390         }
1391         drm_setup_crtcs(fb_helper);
1392
1393         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1394 }
1395 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1396
1397 bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1398 {
1399         int count = 0;
1400         u32 max_width, max_height, bpp_sel;
1401         bool bound = false, crtcs_bound = false;
1402         struct drm_crtc *crtc;
1403
1404         if (!fb_helper->fb)
1405                 return false;
1406
1407         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1408                 if (crtc->fb)
1409                         crtcs_bound = true;
1410                 if (crtc->fb == fb_helper->fb)
1411                         bound = true;
1412         }
1413
1414         if (!bound && crtcs_bound) {
1415                 fb_helper->delayed_hotplug = true;
1416                 return false;
1417         }
1418         DRM_DEBUG_KMS("\n");
1419
1420         max_width = fb_helper->fb->width;
1421         max_height = fb_helper->fb->height;
1422         bpp_sel = fb_helper->fb->bits_per_pixel;
1423
1424         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1425                                                     max_height);
1426         drm_setup_crtcs(fb_helper);
1427
1428         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1429 }
1430 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1431