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 <linux/module.h>
  35 #include "drmP.h"
  36 #include "drm_crtc.h"
  37 #include "drm_fb_helper.h"
  38 #include "drm_crtc_helper.h"
  39
  40 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  41 MODULE_DESCRIPTION("DRM KMS helper");
  42 MODULE_LICENSE("GPL and additional rights");
  43
  44 static LIST_HEAD(kernel_fb_helper_list);
  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 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
  75 {
  76         struct drm_fb_helper_connector *fb_helper_conn;
  77         int i;
  78
  79         for (i = 0; i < fb_helper->connector_count; i++) {
  80                 struct drm_cmdline_mode *mode;
  81                 struct drm_connector *connector;
  82                 char *option = NULL;
  83
  84                 fb_helper_conn = fb_helper->connector_info[i];
  85                 connector = fb_helper_conn->connector;
  86                 mode = &fb_helper_conn->cmdline_mode;
  87
  88                 /* do something on return - turn off connector maybe */
  89                 if (fb_get_options(drm_get_connector_name(connector), &option))
  90                         continue;
  91
  92                 if (drm_mode_parse_command_line_for_connector(option,
  93                                                               connector,
  94                                                               mode)) {
  95                         if (mode->force) {
  96                                 const char *s;
  97                                 switch (mode->force) {
  98                                 case DRM_FORCE_OFF: s = "OFF"; break;
  99                                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 100                                 default:
 101                                 case DRM_FORCE_ON: s = "ON"; break;
 102                                 }
 103
 104                                 DRM_INFO("forcing %s connector %s\n",
 105                                          drm_get_connector_name(connector), s);
 106                                 connector->force = mode->force;
 107                         }
 108
 109                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 110                                       drm_get_connector_name(connector),
 111                                       mode->xres, mode->yres,
 112                                       mode->refresh_specified ? mode->refresh : 60,
 113                                       mode->rb ? " reduced blanking" : "",
 114                                       mode->margins ? " with margins" : "",
 115                                       mode->interlace ?  " interlaced" : "");
 116                 }
 117
 118         }
 119         return 0;
 120 }
 121
 122 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 123 {
 124         uint16_t *r_base, *g_base, *b_base;
 125         int i;
 126
 127         r_base = crtc->gamma_store;
 128         g_base = r_base + crtc->gamma_size;
 129         b_base = g_base + crtc->gamma_size;
 130
 131         for (i = 0; i < crtc->gamma_size; i++)
 132                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 133 }
 134
 135 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 136 {
 137         uint16_t *r_base, *g_base, *b_base;
 138
 139         r_base = crtc->gamma_store;
 140         g_base = r_base + crtc->gamma_size;
 141         b_base = g_base + crtc->gamma_size;
 142
 143         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 144 }
 145
 146 int drm_fb_helper_debug_enter(struct fb_info *info)
 147 {
 148         struct drm_fb_helper *helper = info->par;
 149         struct drm_crtc_helper_funcs *funcs;
 150         int i;
 151
 152         if (list_empty(&kernel_fb_helper_list))
 153                 return false;
 154
 155         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 156                 for (i = 0; i < helper->crtc_count; i++) {
 157                         struct drm_mode_set *mode_set =
 158                                 &helper->crtc_info[i].mode_set;
 159
 160                         if (!mode_set->crtc->enabled)
 161                                 continue;
 162
 163                         funcs = mode_set->crtc->helper_private;
 164                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 165                         funcs->mode_set_base_atomic(mode_set->crtc,
 166                                                     mode_set->fb,
 167                                                     mode_set->x,
 168                                                     mode_set->y,
 169                                                     ENTER_ATOMIC_MODE_SET);
 170                 }
 171         }
 172
 173         return 0;
 174 }
 175 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 176
 177 /* Find the real fb for a given fb helper CRTC */
 178 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 179 {
 180         struct drm_device *dev = crtc->dev;
 181         struct drm_crtc *c;
 182
 183         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 184                 if (crtc->base.id == c->base.id)
 185                         return c->fb;
 186         }
 187
 188         return NULL;
 189 }
 190
 191 int drm_fb_helper_debug_leave(struct fb_info *info)
 192 {
 193         struct drm_fb_helper *helper = info->par;
 194         struct drm_crtc *crtc;
 195         struct drm_crtc_helper_funcs *funcs;
 196         struct drm_framebuffer *fb;
 197         int i;
 198
 199         for (i = 0; i < helper->crtc_count; i++) {
 200                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 201                 crtc = mode_set->crtc;
 202                 funcs = crtc->helper_private;
 203                 fb = drm_mode_config_fb(crtc);
 204
 205                 if (!crtc->enabled)
 206                         continue;
 207
 208                 if (!fb) {
 209                         DRM_ERROR("no fb to restore??\n");
 210                         continue;
 211                 }
 212
 213                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 214                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 215                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 216         }
 217
 218         return 0;
 219 }
 220 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 221
 222 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 223 {
 224         bool error = false;
 225         int i, ret;
 226         for (i = 0; i < fb_helper->crtc_count; i++) {
 227                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 228                 ret = drm_crtc_helper_set_config(mode_set);
 229                 if (ret)
 230                         error = true;
 231         }
 232         return error;
 233 }
 234 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 235
 236 bool drm_fb_helper_force_kernel_mode(void)
 237 {
 238         bool ret, error = false;
 239         struct drm_fb_helper *helper;
 240
 241         if (list_empty(&kernel_fb_helper_list))
 242                 return false;
 243
 244         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 245                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 246                         continue;
 247
 248                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 249                 if (ret)
 250                         error = true;
 251         }
 252         return error;
 253 }
 254
 255 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 256                         void *panic_str)
 257 {
 258         /*
 259          * It's a waste of time and effort to switch back to text console
 260          * if the kernel should reboot before panic messages can be seen.
 261          */
 262         if (panic_timeout < 0)
 263                 return 0;
 264
 265         printk(KERN_ERR "panic occurred, switching back to text console\n");
 266         return drm_fb_helper_force_kernel_mode();
 267 }
 268 EXPORT_SYMBOL(drm_fb_helper_panic);
 269
 270 static struct notifier_block paniced = {
 271         .notifier_call = drm_fb_helper_panic,
 272 };
 273
 274 /**
 275  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 276  *
 277  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 278  */
 279 void drm_fb_helper_restore(void)
 280 {
 281         bool ret;
 282         ret = drm_fb_helper_force_kernel_mode();
 283         if (ret == true)
 284                 DRM_ERROR("Failed to restore crtc configuration\n");
 285 }
 286 EXPORT_SYMBOL(drm_fb_helper_restore);
 287
 288 #ifdef CONFIG_MAGIC_SYSRQ
 289 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 290 {
 291         drm_fb_helper_restore();
 292 }
 293 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 294
 295 static void drm_fb_helper_sysrq(int dummy1)
 296 {
 297         schedule_work(&drm_fb_helper_restore_work);
 298 }
 299
 300 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 301         .handler = drm_fb_helper_sysrq,
 302         .help_msg = "force-fb(V)",
 303         .action_msg = "Restore framebuffer console",
 304 };
 305 #else
 306 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 307 #endif
 308
 309 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 310 {
 311         struct drm_fb_helper *fb_helper = info->par;
 312         struct drm_device *dev = fb_helper->dev;
 313         struct drm_crtc *crtc;
 314         struct drm_connector *connector;
 315         int i, j;
 316
 317         /*
 318          * For each CRTC in this fb, turn the connectors on/off.
 319          */
 320         mutex_lock(&dev->mode_config.mutex);
 321         for (i = 0; i < fb_helper->crtc_count; i++) {
 322                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 323
 324                 if (!crtc->enabled)
 325                         continue;
 326
 327                 /* Walk the connectors & encoders on this fb turning them on/off */
 328                 for (j = 0; j < fb_helper->connector_count; j++) {
 329                         connector = fb_helper->connector_info[j]->connector;
 330                         drm_helper_connector_dpms(connector, dpms_mode);
 331                         drm_connector_property_set_value(connector,
 332                                 dev->mode_config.dpms_property, dpms_mode);
 333                 }
 334         }
 335         mutex_unlock(&dev->mode_config.mutex);
 336 }
 337
 338 int drm_fb_helper_blank(int blank, struct fb_info *info)
 339 {
 340         switch (blank) {
 341         /* Display: On; HSync: On, VSync: On */
 342         case FB_BLANK_UNBLANK:
 343                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 344                 break;
 345         /* Display: Off; HSync: On, VSync: On */
 346         case FB_BLANK_NORMAL:
 347                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 348                 break;
 349         /* Display: Off; HSync: Off, VSync: On */
 350         case FB_BLANK_HSYNC_SUSPEND:
 351                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 352                 break;
 353         /* Display: Off; HSync: On, VSync: Off */
 354         case FB_BLANK_VSYNC_SUSPEND:
 355                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 356                 break;
 357         /* Display: Off; HSync: Off, VSync: Off */
 358         case FB_BLANK_POWERDOWN:
 359                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 360                 break;
 361         }
 362         return 0;
 363 }
 364 EXPORT_SYMBOL(drm_fb_helper_blank);
 365
 366 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 367 {
 368         int i;
 369
 370         for (i = 0; i < helper->connector_count; i++)
 371                 kfree(helper->connector_info[i]);
 372         kfree(helper->connector_info);
 373         for (i = 0; i < helper->crtc_count; i++) {
 374                 kfree(helper->crtc_info[i].mode_set.connectors);
 375                 if (helper->crtc_info[i].mode_set.mode)
 376                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 377         }
 378         kfree(helper->crtc_info);
 379 }
 380
 381 int drm_fb_helper_init(struct drm_device *dev,
 382                        struct drm_fb_helper *fb_helper,
 383                        int crtc_count, int max_conn_count)
 384 {
 385         struct drm_crtc *crtc;
 386         int ret = 0;
 387         int i;
 388
 389         fb_helper->dev = dev;
 390
 391         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 392
 393         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 394         if (!fb_helper->crtc_info)
 395                 return -ENOMEM;
 396
 397         fb_helper->crtc_count = crtc_count;
 398         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 399         if (!fb_helper->connector_info) {
 400                 kfree(fb_helper->crtc_info);
 401                 return -ENOMEM;
 402         }
 403         fb_helper->connector_count = 0;
 404
 405         for (i = 0; i < crtc_count; i++) {
 406                 fb_helper->crtc_info[i].mode_set.connectors =
 407                         kcalloc(max_conn_count,
 408                                 sizeof(struct drm_connector *),
 409                                 GFP_KERNEL);
 410
 411                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 412                         ret = -ENOMEM;
 413                         goto out_free;
 414                 }
 415                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 416         }
 417
 418         i = 0;
 419         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 420                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 421                 i++;
 422         }
 423
 424         return 0;
 425 out_free:
 426         drm_fb_helper_crtc_free(fb_helper);
 427         return -ENOMEM;
 428 }
 429 EXPORT_SYMBOL(drm_fb_helper_init);
 430
 431 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 432 {
 433         if (!list_empty(&fb_helper->kernel_fb_list)) {
 434                 list_del(&fb_helper->kernel_fb_list);
 435                 if (list_empty(&kernel_fb_helper_list)) {
 436                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 437                         atomic_notifier_chain_unregister(&panic_notifier_list,
 438                                                          &paniced);
 439                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 440                 }
 441         }
 442
 443         drm_fb_helper_crtc_free(fb_helper);
 444
 445 }
 446 EXPORT_SYMBOL(drm_fb_helper_fini);
 447
 448 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 449                      u16 blue, u16 regno, struct fb_info *info)
 450 {
 451         struct drm_fb_helper *fb_helper = info->par;
 452         struct drm_framebuffer *fb = fb_helper->fb;
 453         int pindex;
 454
 455         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 456                 u32 *palette;
 457                 u32 value;
 458                 /* place color in psuedopalette */
 459                 if (regno > 16)
 460                         return -EINVAL;
 461                 palette = (u32 *)info->pseudo_palette;
 462                 red >>= (16 - info->var.red.length);
 463                 green >>= (16 - info->var.green.length);
 464                 blue >>= (16 - info->var.blue.length);
 465                 value = (red << info->var.red.offset) |
 466                         (green << info->var.green.offset) |
 467                         (blue << info->var.blue.offset);
 468                 if (info->var.transp.length > 0) {
 469                         u32 mask = (1 << info->var.transp.length) - 1;
 470                         mask <<= info->var.transp.offset;
 471                         value |= mask;
 472                 }
 473                 palette[regno] = value;
 474                 return 0;
 475         }
 476
 477         pindex = regno;
 478
 479         if (fb->bits_per_pixel == 16) {
 480                 pindex = regno << 3;
 481
 482                 if (fb->depth == 16 && regno > 63)
 483                         return -EINVAL;
 484                 if (fb->depth == 15 && regno > 31)
 485                         return -EINVAL;
 486
 487                 if (fb->depth == 16) {
 488                         u16 r, g, b;
 489                         int i;
 490                         if (regno < 32) {
 491                                 for (i = 0; i < 8; i++)
 492                                         fb_helper->funcs->gamma_set(crtc, red,
 493                                                 green, blue, pindex + i);
 494                         }
 495
 496                         fb_helper->funcs->gamma_get(crtc, &r,
 497                                                     &g, &b,
 498                                                     pindex >> 1);
 499
 500                         for (i = 0; i < 4; i++)
 501                                 fb_helper->funcs->gamma_set(crtc, r,
 502                                                             green, b,
 503                                                             (pindex >> 1) + i);
 504                 }
 505         }
 506
 507         if (fb->depth != 16)
 508                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 509         return 0;
 510 }
 511
 512 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 513 {
 514         struct drm_fb_helper *fb_helper = info->par;
 515         struct drm_crtc_helper_funcs *crtc_funcs;
 516         u16 *red, *green, *blue, *transp;
 517         struct drm_crtc *crtc;
 518         int i, j, rc = 0;
 519         int start;
 520
 521         for (i = 0; i < fb_helper->crtc_count; i++) {
 522                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 523                 crtc_funcs = crtc->helper_private;
 524
 525                 red = cmap->red;
 526                 green = cmap->green;
 527                 blue = cmap->blue;
 528                 transp = cmap->transp;
 529                 start = cmap->start;
 530
 531                 for (j = 0; j < cmap->len; j++) {
 532                         u16 hred, hgreen, hblue, htransp = 0xffff;
 533
 534                         hred = *red++;
 535                         hgreen = *green++;
 536                         hblue = *blue++;
 537
 538                         if (transp)
 539                                 htransp = *transp++;
 540
 541                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 542                         if (rc)
 543                                 return rc;
 544                 }
 545                 crtc_funcs->load_lut(crtc);
 546         }
 547         return rc;
 548 }
 549 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 550
 551 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 552                             struct fb_info *info)
 553 {
 554         struct drm_fb_helper *fb_helper = info->par;
 555         struct drm_framebuffer *fb = fb_helper->fb;
 556         int depth;
 557
 558         if (var->pixclock != 0 || in_dbg_master())
 559                 return -EINVAL;
 560
 561         /* Need to resize the fb object !!! */
 562         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 563                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 564                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 565                           fb->width, fb->height, fb->bits_per_pixel);
 566                 return -EINVAL;
 567         }
 568
 569         switch (var->bits_per_pixel) {
 570         case 16:
 571                 depth = (var->green.length == 6) ? 16 : 15;
 572                 break;
 573         case 32:
 574                 depth = (var->transp.length > 0) ? 32 : 24;
 575                 break;
 576         default:
 577                 depth = var->bits_per_pixel;
 578                 break;
 579         }
 580
 581         switch (depth) {
 582         case 8:
 583                 var->red.offset = 0;
 584                 var->green.offset = 0;
 585                 var->blue.offset = 0;
 586                 var->red.length = 8;
 587                 var->green.length = 8;
 588                 var->blue.length = 8;
 589                 var->transp.length = 0;
 590                 var->transp.offset = 0;
 591                 break;
 592         case 15:
 593                 var->red.offset = 10;
 594                 var->green.offset = 5;
 595                 var->blue.offset = 0;
 596                 var->red.length = 5;
 597                 var->green.length = 5;
 598                 var->blue.length = 5;
 599                 var->transp.length = 1;
 600                 var->transp.offset = 15;
 601                 break;
 602         case 16:
 603                 var->red.offset = 11;
 604                 var->green.offset = 5;
 605                 var->blue.offset = 0;
 606                 var->red.length = 5;
 607                 var->green.length = 6;
 608                 var->blue.length = 5;
 609                 var->transp.length = 0;
 610                 var->transp.offset = 0;
 611                 break;
 612         case 24:
 613                 var->red.offset = 16;
 614                 var->green.offset = 8;
 615                 var->blue.offset = 0;
 616                 var->red.length = 8;
 617                 var->green.length = 8;
 618                 var->blue.length = 8;
 619                 var->transp.length = 0;
 620                 var->transp.offset = 0;
 621                 break;
 622         case 32:
 623                 var->red.offset = 16;
 624                 var->green.offset = 8;
 625                 var->blue.offset = 0;
 626                 var->red.length = 8;
 627                 var->green.length = 8;
 628                 var->blue.length = 8;
 629                 var->transp.length = 8;
 630                 var->transp.offset = 24;
 631                 break;
 632         default:
 633                 return -EINVAL;
 634         }
 635         return 0;
 636 }
 637 EXPORT_SYMBOL(drm_fb_helper_check_var);
 638
 639 /* this will let fbcon do the mode init */
 640 int drm_fb_helper_set_par(struct fb_info *info)
 641 {
 642         struct drm_fb_helper *fb_helper = info->par;
 643         struct drm_device *dev = fb_helper->dev;
 644         struct fb_var_screeninfo *var = &info->var;
 645         struct drm_crtc *crtc;
 646         int ret;
 647         int i;
 648
 649         if (var->pixclock != 0) {
 650                 DRM_ERROR("PIXEL CLOCK SET\n");
 651                 return -EINVAL;
 652         }
 653
 654         mutex_lock(&dev->mode_config.mutex);
 655         for (i = 0; i < fb_helper->crtc_count; i++) {
 656                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 657                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 658                 if (ret) {
 659                         mutex_unlock(&dev->mode_config.mutex);
 660                         return ret;
 661                 }
 662         }
 663         mutex_unlock(&dev->mode_config.mutex);
 664
 665         if (fb_helper->delayed_hotplug) {
 666                 fb_helper->delayed_hotplug = false;
 667                 drm_fb_helper_hotplug_event(fb_helper);
 668         }
 669         return 0;
 670 }
 671 EXPORT_SYMBOL(drm_fb_helper_set_par);
 672
 673 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 674                               struct fb_info *info)
 675 {
 676         struct drm_fb_helper *fb_helper = info->par;
 677         struct drm_device *dev = fb_helper->dev;
 678         struct drm_mode_set *modeset;
 679         struct drm_crtc *crtc;
 680         int ret = 0;
 681         int i;
 682
 683         mutex_lock(&dev->mode_config.mutex);
 684         for (i = 0; i < fb_helper->crtc_count; i++) {
 685                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 686
 687                 modeset = &fb_helper->crtc_info[i].mode_set;
 688
 689                 modeset->x = var->xoffset;
 690                 modeset->y = var->yoffset;
 691
 692                 if (modeset->num_connectors) {
 693                         ret = crtc->funcs->set_config(modeset);
 694                         if (!ret) {
 695                                 info->var.xoffset = var->xoffset;
 696                                 info->var.yoffset = var->yoffset;
 697                         }
 698                 }
 699         }
 700         mutex_unlock(&dev->mode_config.mutex);
 701         return ret;
 702 }
 703 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 704
 705 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 706                                   int preferred_bpp)
 707 {
 708         int new_fb = 0;
 709         int crtc_count = 0;
 710         int i;
 711         struct fb_info *info;
 712         struct drm_fb_helper_surface_size sizes;
 713         int gamma_size = 0;
 714
 715         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 716         sizes.surface_depth = 24;
 717         sizes.surface_bpp = 32;
 718         sizes.fb_width = (unsigned)-1;
 719         sizes.fb_height = (unsigned)-1;
 720
 721         /* if driver picks 8 or 16 by default use that
 722            for both depth/bpp */
 723         if (preferred_bpp != sizes.surface_bpp) {
 724                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 725         }
 726         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 727         for (i = 0; i < fb_helper->connector_count; i++) {
 728                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 729                 struct drm_cmdline_mode *cmdline_mode;
 730
 731                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 732
 733                 if (cmdline_mode->bpp_specified) {
 734                         switch (cmdline_mode->bpp) {
 735                         case 8:
 736                                 sizes.surface_depth = sizes.surface_bpp = 8;
 737                                 break;
 738                         case 15:
 739                                 sizes.surface_depth = 15;
 740                                 sizes.surface_bpp = 16;
 741                                 break;
 742                         case 16:
 743                                 sizes.surface_depth = sizes.surface_bpp = 16;
 744                                 break;
 745                         case 24:
 746                                 sizes.surface_depth = sizes.surface_bpp = 24;
 747                                 break;
 748                         case 32:
 749                                 sizes.surface_depth = 24;
 750                                 sizes.surface_bpp = 32;
 751                                 break;
 752                         }
 753                         break;
 754                 }
 755         }
 756
 757         crtc_count = 0;
 758         for (i = 0; i < fb_helper->crtc_count; i++) {
 759                 struct drm_display_mode *desired_mode;
 760                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 761
 762                 if (desired_mode) {
 763                         if (gamma_size == 0)
 764                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 765                         if (desired_mode->hdisplay < sizes.fb_width)
 766                                 sizes.fb_width = desired_mode->hdisplay;
 767                         if (desired_mode->vdisplay < sizes.fb_height)
 768                                 sizes.fb_height = desired_mode->vdisplay;
 769                         if (desired_mode->hdisplay > sizes.surface_width)
 770                                 sizes.surface_width = desired_mode->hdisplay;
 771                         if (desired_mode->vdisplay > sizes.surface_height)
 772                                 sizes.surface_height = desired_mode->vdisplay;
 773                         crtc_count++;
 774                 }
 775         }
 776
 777         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 778                 /* hmm everyone went away - assume VGA cable just fell out
 779                    and will come back later. */
 780                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 781                 sizes.fb_width = sizes.surface_width = 1024;
 782                 sizes.fb_height = sizes.surface_height = 768;
 783         }
 784
 785         /* push down into drivers */
 786         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 787         if (new_fb < 0)
 788                 return new_fb;
 789
 790         info = fb_helper->fbdev;
 791
 792         /* set the fb pointer */
 793         for (i = 0; i < fb_helper->crtc_count; i++) {
 794                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 795         }
 796
 797         if (new_fb) {
 798                 info->var.pixclock = 0;
 799                 if (register_framebuffer(info) < 0) {
 800                         return -EINVAL;
 801                 }
 802
 803                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 804                        info->fix.id);
 805
 806         } else {
 807                 drm_fb_helper_set_par(info);
 808         }
 809
 810         /* Switch back to kernel console on panic */
 811         /* multi card linked list maybe */
 812         if (list_empty(&kernel_fb_helper_list)) {
 813                 printk(KERN_INFO "drm: registered panic notifier\n");
 814                 atomic_notifier_chain_register(&panic_notifier_list,
 815                                                &paniced);
 816                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 817         }
 818         if (new_fb)
 819                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 820
 821         return 0;
 822 }
 823 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 824
 825 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 826                             uint32_t depth)
 827 {
 828         info->fix.type = FB_TYPE_PACKED_PIXELS;
 829         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 830                 FB_VISUAL_TRUECOLOR;
 831         info->fix.mmio_start = 0;
 832         info->fix.mmio_len = 0;
 833         info->fix.type_aux = 0;
 834         info->fix.xpanstep = 1; /* doing it in hw */
 835         info->fix.ypanstep = 1; /* doing it in hw */
 836         info->fix.ywrapstep = 0;
 837         info->fix.accel = FB_ACCEL_NONE;
 838         info->fix.type_aux = 0;
 839
 840         info->fix.line_length = pitch;
 841         return;
 842 }
 843 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 844
 845 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 846                             uint32_t fb_width, uint32_t fb_height)
 847 {
 848         struct drm_framebuffer *fb = fb_helper->fb;
 849         info->pseudo_palette = fb_helper->pseudo_palette;
 850         info->var.xres_virtual = fb->width;
 851         info->var.yres_virtual = fb->height;
 852         info->var.bits_per_pixel = fb->bits_per_pixel;
 853         info->var.accel_flags = FB_ACCELF_TEXT;
 854         info->var.xoffset = 0;
 855         info->var.yoffset = 0;
 856         info->var.activate = FB_ACTIVATE_NOW;
 857         info->var.height = -1;
 858         info->var.width = -1;
 859
 860         switch (fb->depth) {
 861         case 8:
 862                 info->var.red.offset = 0;
 863                 info->var.green.offset = 0;
 864                 info->var.blue.offset = 0;
 865                 info->var.red.length = 8; /* 8bit DAC */
 866                 info->var.green.length = 8;
 867                 info->var.blue.length = 8;
 868                 info->var.transp.offset = 0;
 869                 info->var.transp.length = 0;
 870                 break;
 871         case 15:
 872                 info->var.red.offset = 10;
 873                 info->var.green.offset = 5;
 874                 info->var.blue.offset = 0;
 875                 info->var.red.length = 5;
 876                 info->var.green.length = 5;
 877                 info->var.blue.length = 5;
 878                 info->var.transp.offset = 15;
 879                 info->var.transp.length = 1;
 880                 break;
 881         case 16:
 882                 info->var.red.offset = 11;
 883                 info->var.green.offset = 5;
 884                 info->var.blue.offset = 0;
 885                 info->var.red.length = 5;
 886                 info->var.green.length = 6;
 887                 info->var.blue.length = 5;
 888                 info->var.transp.offset = 0;
 889                 break;
 890         case 24:
 891                 info->var.red.offset = 16;
 892                 info->var.green.offset = 8;
 893                 info->var.blue.offset = 0;
 894                 info->var.red.length = 8;
 895                 info->var.green.length = 8;
 896                 info->var.blue.length = 8;
 897                 info->var.transp.offset = 0;
 898                 info->var.transp.length = 0;
 899                 break;
 900         case 32:
 901                 info->var.red.offset = 16;
 902                 info->var.green.offset = 8;
 903                 info->var.blue.offset = 0;
 904                 info->var.red.length = 8;
 905                 info->var.green.length = 8;
 906                 info->var.blue.length = 8;
 907                 info->var.transp.offset = 24;
 908                 info->var.transp.length = 8;
 909                 break;
 910         default:
 911                 break;
 912         }
 913
 914         info->var.xres = fb_width;
 915         info->var.yres = fb_height;
 916 }
 917 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 918
 919 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 920                                                uint32_t maxX,
 921                                                uint32_t maxY)
 922 {
 923         struct drm_connector *connector;
 924         int count = 0;
 925         int i;
 926
 927         for (i = 0; i < fb_helper->connector_count; i++) {
 928                 connector = fb_helper->connector_info[i]->connector;
 929                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 930         }
 931
 932         return count;
 933 }
 934
 935 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
 936 {
 937         struct drm_display_mode *mode;
 938
 939         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
 940                 if (drm_mode_width(mode) > width ||
 941                     drm_mode_height(mode) > height)
 942                         continue;
 943                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 944                         return mode;
 945         }
 946         return NULL;
 947 }
 948
 949 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
 950 {
 951         struct drm_cmdline_mode *cmdline_mode;
 952         cmdline_mode = &fb_connector->cmdline_mode;
 953         return cmdline_mode->specified;
 954 }
 955
 956 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 957                                                       int width, int height)
 958 {
 959         struct drm_cmdline_mode *cmdline_mode;
 960         struct drm_display_mode *mode = NULL;
 961
 962         cmdline_mode = &fb_helper_conn->cmdline_mode;
 963         if (cmdline_mode->specified == false)
 964                 return mode;
 965
 966         /* attempt to find a matching mode in the list of modes
 967          *  we have gotten so far, if not add a CVT mode that conforms
 968          */
 969         if (cmdline_mode->rb || cmdline_mode->margins)
 970                 goto create_mode;
 971
 972         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
 973                 /* check width/height */
 974                 if (mode->hdisplay != cmdline_mode->xres ||
 975                     mode->vdisplay != cmdline_mode->yres)
 976                         continue;
 977
 978                 if (cmdline_mode->refresh_specified) {
 979                         if (mode->vrefresh != cmdline_mode->refresh)
 980                                 continue;
 981                 }
 982
 983                 if (cmdline_mode->interlace) {
 984                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
 985                                 continue;
 986                 }
 987                 return mode;
 988         }
 989
 990 create_mode:
 991         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
 992                                                  cmdline_mode);
 993         list_add(&mode->head, &fb_helper_conn->connector->modes);
 994         return mode;
 995 }
 996
 997 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
 998 {
 999         bool enable;
1000
1001         if (strict) {
1002                 enable = connector->status == connector_status_connected;
1003         } else {
1004                 enable = connector->status != connector_status_disconnected;
1005         }
1006         return enable;
1007 }
1008
1009 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1010                                   bool *enabled)
1011 {
1012         bool any_enabled = false;
1013         struct drm_connector *connector;
1014         int i = 0;
1015
1016         for (i = 0; i < fb_helper->connector_count; i++) {
1017                 connector = fb_helper->connector_info[i]->connector;
1018                 enabled[i] = drm_connector_enabled(connector, true);
1019                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1020                           enabled[i] ? "yes" : "no");
1021                 any_enabled |= enabled[i];
1022         }
1023
1024         if (any_enabled)
1025                 return;
1026
1027         for (i = 0; i < fb_helper->connector_count; i++) {
1028                 connector = fb_helper->connector_info[i]->connector;
1029                 enabled[i] = drm_connector_enabled(connector, false);
1030         }
1031 }
1032
1033 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1034                               struct drm_display_mode **modes,
1035                               bool *enabled, int width, int height)
1036 {
1037         int count, i, j;
1038         bool can_clone = false;
1039         struct drm_fb_helper_connector *fb_helper_conn;
1040         struct drm_display_mode *dmt_mode, *mode;
1041
1042         /* only contemplate cloning in the single crtc case */
1043         if (fb_helper->crtc_count > 1)
1044                 return false;
1045
1046         count = 0;
1047         for (i = 0; i < fb_helper->connector_count; i++) {
1048                 if (enabled[i])
1049                         count++;
1050         }
1051
1052         /* only contemplate cloning if more than one connector is enabled */
1053         if (count <= 1)
1054                 return false;
1055
1056         /* check the command line or if nothing common pick 1024x768 */
1057         can_clone = true;
1058         for (i = 0; i < fb_helper->connector_count; i++) {
1059                 if (!enabled[i])
1060                         continue;
1061                 fb_helper_conn = fb_helper->connector_info[i];
1062                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1063                 if (!modes[i]) {
1064                         can_clone = false;
1065                         break;
1066                 }
1067                 for (j = 0; j < i; j++) {
1068                         if (!enabled[j])
1069                                 continue;
1070                         if (!drm_mode_equal(modes[j], modes[i]))
1071                                 can_clone = false;
1072                 }
1073         }
1074
1075         if (can_clone) {
1076                 DRM_DEBUG_KMS("can clone using command line\n");
1077                 return true;
1078         }
1079
1080         /* try and find a 1024x768 mode on each connector */
1081         can_clone = true;
1082         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1083
1084         for (i = 0; i < fb_helper->connector_count; i++) {
1085
1086                 if (!enabled[i])
1087                         continue;
1088
1089                 fb_helper_conn = fb_helper->connector_info[i];
1090                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1091                         if (drm_mode_equal(mode, dmt_mode))
1092                                 modes[i] = mode;
1093                 }
1094                 if (!modes[i])
1095                         can_clone = false;
1096         }
1097
1098         if (can_clone) {
1099                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1100                 return true;
1101         }
1102         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1103         return false;
1104 }
1105
1106 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1107                                  struct drm_display_mode **modes,
1108                                  bool *enabled, int width, int height)
1109 {
1110         struct drm_fb_helper_connector *fb_helper_conn;
1111         int i;
1112
1113         for (i = 0; i < fb_helper->connector_count; i++) {
1114                 fb_helper_conn = fb_helper->connector_info[i];
1115
1116                 if (enabled[i] == false)
1117                         continue;
1118
1119                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1120                               fb_helper_conn->connector->base.id);
1121
1122                 /* got for command line mode first */
1123                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1124                 if (!modes[i]) {
1125                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1126                                       fb_helper_conn->connector->base.id);
1127                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1128                 }
1129                 /* No preferred modes, pick one off the list */
1130                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1131                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1132                                 break;
1133                 }
1134                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1135                           "none");
1136         }
1137         return true;
1138 }
1139
1140 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1141                           struct drm_fb_helper_crtc **best_crtcs,
1142                           struct drm_display_mode **modes,
1143                           int n, int width, int height)
1144 {
1145         int c, o;
1146         struct drm_device *dev = fb_helper->dev;
1147         struct drm_connector *connector;
1148         struct drm_connector_helper_funcs *connector_funcs;
1149         struct drm_encoder *encoder;
1150         struct drm_fb_helper_crtc *best_crtc;
1151         int my_score, best_score, score;
1152         struct drm_fb_helper_crtc **crtcs, *crtc;
1153         struct drm_fb_helper_connector *fb_helper_conn;
1154
1155         if (n == fb_helper->connector_count)
1156                 return 0;
1157
1158         fb_helper_conn = fb_helper->connector_info[n];
1159         connector = fb_helper_conn->connector;
1160
1161         best_crtcs[n] = NULL;
1162         best_crtc = NULL;
1163         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1164         if (modes[n] == NULL)
1165                 return best_score;
1166
1167         crtcs = kzalloc(dev->mode_config.num_connector *
1168                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1169         if (!crtcs)
1170                 return best_score;
1171
1172         my_score = 1;
1173         if (connector->status == connector_status_connected)
1174                 my_score++;
1175         if (drm_has_cmdline_mode(fb_helper_conn))
1176                 my_score++;
1177         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1178                 my_score++;
1179
1180         connector_funcs = connector->helper_private;
1181         encoder = connector_funcs->best_encoder(connector);
1182         if (!encoder)
1183                 goto out;
1184
1185         /* select a crtc for this connector and then attempt to configure
1186            remaining connectors */
1187         for (c = 0; c < fb_helper->crtc_count; c++) {
1188                 crtc = &fb_helper->crtc_info[c];
1189
1190                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1191                         continue;
1192                 }
1193
1194                 for (o = 0; o < n; o++)
1195                         if (best_crtcs[o] == crtc)
1196                                 break;
1197
1198                 if (o < n) {
1199                         /* ignore cloning unless only a single crtc */
1200                         if (fb_helper->crtc_count > 1)
1201                                 continue;
1202
1203                         if (!drm_mode_equal(modes[o], modes[n]))
1204                                 continue;
1205                 }
1206
1207                 crtcs[n] = crtc;
1208                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1209                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1210                                                   width, height);
1211                 if (score > best_score) {
1212                         best_crtc = crtc;
1213                         best_score = score;
1214                         memcpy(best_crtcs, crtcs,
1215                                dev->mode_config.num_connector *
1216                                sizeof(struct drm_fb_helper_crtc *));
1217                 }
1218         }
1219 out:
1220         kfree(crtcs);
1221         return best_score;
1222 }
1223
1224 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1225 {
1226         struct drm_device *dev = fb_helper->dev;
1227         struct drm_fb_helper_crtc **crtcs;
1228         struct drm_display_mode **modes;
1229         struct drm_encoder *encoder;
1230         struct drm_mode_set *modeset;
1231         bool *enabled;
1232         int width, height;
1233         int i, ret;
1234
1235         DRM_DEBUG_KMS("\n");
1236
1237         width = dev->mode_config.max_width;
1238         height = dev->mode_config.max_height;
1239
1240         /* clean out all the encoder/crtc combos */
1241         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1242                 encoder->crtc = NULL;
1243         }
1244
1245         crtcs = kcalloc(dev->mode_config.num_connector,
1246                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1247         modes = kcalloc(dev->mode_config.num_connector,
1248                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1249         enabled = kcalloc(dev->mode_config.num_connector,
1250                           sizeof(bool), GFP_KERNEL);
1251
1252         drm_enable_connectors(fb_helper, enabled);
1253
1254         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1255         if (!ret) {
1256                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1257                 if (!ret)
1258                         DRM_ERROR("Unable to find initial modes\n");
1259         }
1260
1261         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1262
1263         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1264
1265         /* need to set the modesets up here for use later */
1266         /* fill out the connector<->crtc mappings into the modesets */
1267         for (i = 0; i < fb_helper->crtc_count; i++) {
1268                 modeset = &fb_helper->crtc_info[i].mode_set;
1269                 modeset->num_connectors = 0;
1270         }
1271
1272         for (i = 0; i < fb_helper->connector_count; i++) {
1273                 struct drm_display_mode *mode = modes[i];
1274                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1275                 modeset = &fb_crtc->mode_set;
1276
1277                 if (mode && fb_crtc) {
1278                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1279                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1280                         fb_crtc->desired_mode = mode;
1281                         if (modeset->mode)
1282                                 drm_mode_destroy(dev, modeset->mode);
1283                         modeset->mode = drm_mode_duplicate(dev,
1284                                                            fb_crtc->desired_mode);
1285                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1286                 }
1287         }
1288
1289         kfree(crtcs);
1290         kfree(modes);
1291         kfree(enabled);
1292 }
1293
1294 /**
1295  * drm_helper_initial_config - setup a sane initial connector configuration
1296  * @dev: DRM device
1297  *
1298  * LOCKING:
1299  * Called at init time, must take mode config lock.
1300  *
1301  * Scan the CRTCs and connectors and try to put together an initial setup.
1302  * At the moment, this is a cloned configuration across all heads with
1303  * a new framebuffer object as the backing store.
1304  *
1305  * RETURNS:
1306  * Zero if everything went ok, nonzero otherwise.
1307  */
1308 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1309 {
1310         struct drm_device *dev = fb_helper->dev;
1311         int count = 0;
1312
1313         /* disable all the possible outputs/crtcs before entering KMS mode */
1314         drm_helper_disable_unused_functions(fb_helper->dev);
1315
1316         drm_fb_helper_parse_command_line(fb_helper);
1317
1318         count = drm_fb_helper_probe_connector_modes(fb_helper,
1319                                                     dev->mode_config.max_width,
1320                                                     dev->mode_config.max_height);
1321         /*
1322          * we shouldn't end up with no modes here.
1323          */
1324         if (count == 0) {
1325                 printk(KERN_INFO "No connectors reported connected with modes\n");
1326         }
1327         drm_setup_crtcs(fb_helper);
1328
1329         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1330 }
1331 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1332
1333 /**
1334  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1335  *                               probing all the outputs attached to the fb.
1336  * @fb_helper: the drm_fb_helper
1337  *
1338  * LOCKING:
1339  * Called at runtime, must take mode config lock.
1340  *
1341  * Scan the connectors attached to the fb_helper and try to put together a
1342  * setup after *notification of a change in output configuration.
1343  *
1344  * RETURNS:
1345  * 0 on success and a non-zero error code otherwise.
1346  */
1347 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1348 {
1349         struct drm_device *dev = fb_helper->dev;
1350         int count = 0;
1351         u32 max_width, max_height, bpp_sel;
1352         bool bound = false, crtcs_bound = false;
1353         struct drm_crtc *crtc;
1354
1355         if (!fb_helper->fb)
1356                 return 0;
1357
1358         mutex_lock(&dev->mode_config.mutex);
1359         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1360                 if (crtc->fb)
1361                         crtcs_bound = true;
1362                 if (crtc->fb == fb_helper->fb)
1363                         bound = true;
1364         }
1365
1366         if (!bound && crtcs_bound) {
1367                 fb_helper->delayed_hotplug = true;
1368                 mutex_unlock(&dev->mode_config.mutex);
1369                 return 0;
1370         }
1371         DRM_DEBUG_KMS("\n");
1372
1373         max_width = fb_helper->fb->width;
1374         max_height = fb_helper->fb->height;
1375         bpp_sel = fb_helper->fb->bits_per_pixel;
1376
1377         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1378                                                     max_height);
1379         drm_setup_crtcs(fb_helper);
1380         mutex_unlock(&dev->mode_config.mutex);
1381
1382         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1383 }
1384 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1385
1386 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1387  * but the module doesn't depend on any fb console symbols.  At least
1388  * attempt to load fbcon to avoid leaving the system without a usable console.
1389  */
1390 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1391 static int __init drm_fb_helper_modinit(void)
1392 {
1393         const char *name = "fbcon";
1394         struct module *fbcon;
1395
1396         mutex_lock(&module_mutex);
1397         fbcon = find_module(name);
1398         mutex_unlock(&module_mutex);
1399
1400         if (!fbcon)
1401                 request_module_nowait(name);
1402         return 0;
1403 }
1404
1405 module_init(drm_fb_helper_modinit);
1406 #endif