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                 struct drm_crtc *crtc = mode_set->crtc;
 229
 230                 if (!crtc->enabled)
 231                         continue;
 232
 233                 ret = drm_crtc_helper_set_config(mode_set);
 234                 if (ret)
 235                         error = true;
 236         }
 237         return error;
 238 }
 239 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 240
 241 bool drm_fb_helper_force_kernel_mode(void)
 242 {
 243         bool ret, error = false;
 244         struct drm_fb_helper *helper;
 245
 246         if (list_empty(&kernel_fb_helper_list))
 247                 return false;
 248
 249         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 250                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 251                         continue;
 252
 253                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 254                 if (ret)
 255                         error = true;
 256         }
 257         return error;
 258 }
 259
 260 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 261                         void *panic_str)
 262 {
 263         /*
 264          * It's a waste of time and effort to switch back to text console
 265          * if the kernel should reboot before panic messages can be seen.
 266          */
 267         if (panic_timeout < 0)
 268                 return 0;
 269
 270         printk(KERN_ERR "panic occurred, switching back to text console\n");
 271         return drm_fb_helper_force_kernel_mode();
 272 }
 273 EXPORT_SYMBOL(drm_fb_helper_panic);
 274
 275 static struct notifier_block paniced = {
 276         .notifier_call = drm_fb_helper_panic,
 277 };
 278
 279 /**
 280  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 281  *
 282  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 283  */
 284 void drm_fb_helper_restore(void)
 285 {
 286         bool ret;
 287         ret = drm_fb_helper_force_kernel_mode();
 288         if (ret == true)
 289                 DRM_ERROR("Failed to restore crtc configuration\n");
 290 }
 291 EXPORT_SYMBOL(drm_fb_helper_restore);
 292
 293 #ifdef CONFIG_MAGIC_SYSRQ
 294 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 295 {
 296         drm_fb_helper_restore();
 297 }
 298 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 299
 300 static void drm_fb_helper_sysrq(int dummy1)
 301 {
 302         schedule_work(&drm_fb_helper_restore_work);
 303 }
 304
 305 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 306         .handler = drm_fb_helper_sysrq,
 307         .help_msg = "force-fb(V)",
 308         .action_msg = "Restore framebuffer console",
 309 };
 310 #else
 311 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 312 #endif
 313
 314 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 315 {
 316         struct drm_fb_helper *fb_helper = info->par;
 317         struct drm_device *dev = fb_helper->dev;
 318         struct drm_crtc *crtc;
 319         struct drm_connector *connector;
 320         int i, j;
 321
 322         /*
 323          * For each CRTC in this fb, turn the connectors on/off.
 324          */
 325         mutex_lock(&dev->mode_config.mutex);
 326         for (i = 0; i < fb_helper->crtc_count; i++) {
 327                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 328
 329                 if (!crtc->enabled)
 330                         continue;
 331
 332                 /* Walk the connectors & encoders on this fb turning them on/off */
 333                 for (j = 0; j < fb_helper->connector_count; j++) {
 334                         connector = fb_helper->connector_info[j]->connector;
 335                         drm_helper_connector_dpms(connector, dpms_mode);
 336                         drm_connector_property_set_value(connector,
 337                                 dev->mode_config.dpms_property, dpms_mode);
 338                 }
 339         }
 340         mutex_unlock(&dev->mode_config.mutex);
 341 }
 342
 343 int drm_fb_helper_blank(int blank, struct fb_info *info)
 344 {
 345         switch (blank) {
 346         /* Display: On; HSync: On, VSync: On */
 347         case FB_BLANK_UNBLANK:
 348                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 349                 break;
 350         /* Display: Off; HSync: On, VSync: On */
 351         case FB_BLANK_NORMAL:
 352                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 353                 break;
 354         /* Display: Off; HSync: Off, VSync: On */
 355         case FB_BLANK_HSYNC_SUSPEND:
 356                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 357                 break;
 358         /* Display: Off; HSync: On, VSync: Off */
 359         case FB_BLANK_VSYNC_SUSPEND:
 360                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 361                 break;
 362         /* Display: Off; HSync: Off, VSync: Off */
 363         case FB_BLANK_POWERDOWN:
 364                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 365                 break;
 366         }
 367         return 0;
 368 }
 369 EXPORT_SYMBOL(drm_fb_helper_blank);
 370
 371 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 372 {
 373         int i;
 374
 375         for (i = 0; i < helper->connector_count; i++)
 376                 kfree(helper->connector_info[i]);
 377         kfree(helper->connector_info);
 378         for (i = 0; i < helper->crtc_count; i++) {
 379                 kfree(helper->crtc_info[i].mode_set.connectors);
 380                 if (helper->crtc_info[i].mode_set.mode)
 381                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 382         }
 383         kfree(helper->crtc_info);
 384 }
 385
 386 int drm_fb_helper_init(struct drm_device *dev,
 387                        struct drm_fb_helper *fb_helper,
 388                        int crtc_count, int max_conn_count)
 389 {
 390         struct drm_crtc *crtc;
 391         int ret = 0;
 392         int i;
 393
 394         fb_helper->dev = dev;
 395
 396         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 397
 398         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 399         if (!fb_helper->crtc_info)
 400                 return -ENOMEM;
 401
 402         fb_helper->crtc_count = crtc_count;
 403         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 404         if (!fb_helper->connector_info) {
 405                 kfree(fb_helper->crtc_info);
 406                 return -ENOMEM;
 407         }
 408         fb_helper->connector_count = 0;
 409
 410         for (i = 0; i < crtc_count; i++) {
 411                 fb_helper->crtc_info[i].mode_set.connectors =
 412                         kcalloc(max_conn_count,
 413                                 sizeof(struct drm_connector *),
 414                                 GFP_KERNEL);
 415
 416                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 417                         ret = -ENOMEM;
 418                         goto out_free;
 419                 }
 420                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 421         }
 422
 423         i = 0;
 424         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 425                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 426                 i++;
 427         }
 428
 429         return 0;
 430 out_free:
 431         drm_fb_helper_crtc_free(fb_helper);
 432         return -ENOMEM;
 433 }
 434 EXPORT_SYMBOL(drm_fb_helper_init);
 435
 436 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 437 {
 438         if (!list_empty(&fb_helper->kernel_fb_list)) {
 439                 list_del(&fb_helper->kernel_fb_list);
 440                 if (list_empty(&kernel_fb_helper_list)) {
 441                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 442                         atomic_notifier_chain_unregister(&panic_notifier_list,
 443                                                          &paniced);
 444                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 445                 }
 446         }
 447
 448         drm_fb_helper_crtc_free(fb_helper);
 449
 450 }
 451 EXPORT_SYMBOL(drm_fb_helper_fini);
 452
 453 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 454                      u16 blue, u16 regno, struct fb_info *info)
 455 {
 456         struct drm_fb_helper *fb_helper = info->par;
 457         struct drm_framebuffer *fb = fb_helper->fb;
 458         int pindex;
 459
 460         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 461                 u32 *palette;
 462                 u32 value;
 463                 /* place color in psuedopalette */
 464                 if (regno > 16)
 465                         return -EINVAL;
 466                 palette = (u32 *)info->pseudo_palette;
 467                 red >>= (16 - info->var.red.length);
 468                 green >>= (16 - info->var.green.length);
 469                 blue >>= (16 - info->var.blue.length);
 470                 value = (red << info->var.red.offset) |
 471                         (green << info->var.green.offset) |
 472                         (blue << info->var.blue.offset);
 473                 if (info->var.transp.length > 0) {
 474                         u32 mask = (1 << info->var.transp.length) - 1;
 475                         mask <<= info->var.transp.offset;
 476                         value |= mask;
 477                 }
 478                 palette[regno] = value;
 479                 return 0;
 480         }
 481
 482         pindex = regno;
 483
 484         if (fb->bits_per_pixel == 16) {
 485                 pindex = regno << 3;
 486
 487                 if (fb->depth == 16 && regno > 63)
 488                         return -EINVAL;
 489                 if (fb->depth == 15 && regno > 31)
 490                         return -EINVAL;
 491
 492                 if (fb->depth == 16) {
 493                         u16 r, g, b;
 494                         int i;
 495                         if (regno < 32) {
 496                                 for (i = 0; i < 8; i++)
 497                                         fb_helper->funcs->gamma_set(crtc, red,
 498                                                 green, blue, pindex + i);
 499                         }
 500
 501                         fb_helper->funcs->gamma_get(crtc, &r,
 502                                                     &g, &b,
 503                                                     pindex >> 1);
 504
 505                         for (i = 0; i < 4; i++)
 506                                 fb_helper->funcs->gamma_set(crtc, r,
 507                                                             green, b,
 508                                                             (pindex >> 1) + i);
 509                 }
 510         }
 511
 512         if (fb->depth != 16)
 513                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 514         return 0;
 515 }
 516
 517 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 518 {
 519         struct drm_fb_helper *fb_helper = info->par;
 520         struct drm_crtc_helper_funcs *crtc_funcs;
 521         u16 *red, *green, *blue, *transp;
 522         struct drm_crtc *crtc;
 523         int i, j, rc = 0;
 524         int start;
 525
 526         for (i = 0; i < fb_helper->crtc_count; i++) {
 527                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 528                 crtc_funcs = crtc->helper_private;
 529
 530                 red = cmap->red;
 531                 green = cmap->green;
 532                 blue = cmap->blue;
 533                 transp = cmap->transp;
 534                 start = cmap->start;
 535
 536                 for (j = 0; j < cmap->len; j++) {
 537                         u16 hred, hgreen, hblue, htransp = 0xffff;
 538
 539                         hred = *red++;
 540                         hgreen = *green++;
 541                         hblue = *blue++;
 542
 543                         if (transp)
 544                                 htransp = *transp++;
 545
 546                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 547                         if (rc)
 548                                 return rc;
 549                 }
 550                 crtc_funcs->load_lut(crtc);
 551         }
 552         return rc;
 553 }
 554 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 555
 556 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 557                             struct fb_info *info)
 558 {
 559         struct drm_fb_helper *fb_helper = info->par;
 560         struct drm_framebuffer *fb = fb_helper->fb;
 561         int depth;
 562
 563         if (var->pixclock != 0 || in_dbg_master())
 564                 return -EINVAL;
 565
 566         /* Need to resize the fb object !!! */
 567         if (var->bits_per_pixel > fb->bits_per_pixel ||
 568             var->xres > fb->width || var->yres > fb->height ||
 569             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 570                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 571                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 572                           var->xres, var->yres, var->bits_per_pixel,
 573                           var->xres_virtual, var->yres_virtual,
 574                           fb->width, fb->height, fb->bits_per_pixel);
 575                 return -EINVAL;
 576         }
 577
 578         switch (var->bits_per_pixel) {
 579         case 16:
 580                 depth = (var->green.length == 6) ? 16 : 15;
 581                 break;
 582         case 32:
 583                 depth = (var->transp.length > 0) ? 32 : 24;
 584                 break;
 585         default:
 586                 depth = var->bits_per_pixel;
 587                 break;
 588         }
 589
 590         switch (depth) {
 591         case 8:
 592                 var->red.offset = 0;
 593                 var->green.offset = 0;
 594                 var->blue.offset = 0;
 595                 var->red.length = 8;
 596                 var->green.length = 8;
 597                 var->blue.length = 8;
 598                 var->transp.length = 0;
 599                 var->transp.offset = 0;
 600                 break;
 601         case 15:
 602                 var->red.offset = 10;
 603                 var->green.offset = 5;
 604                 var->blue.offset = 0;
 605                 var->red.length = 5;
 606                 var->green.length = 5;
 607                 var->blue.length = 5;
 608                 var->transp.length = 1;
 609                 var->transp.offset = 15;
 610                 break;
 611         case 16:
 612                 var->red.offset = 11;
 613                 var->green.offset = 5;
 614                 var->blue.offset = 0;
 615                 var->red.length = 5;
 616                 var->green.length = 6;
 617                 var->blue.length = 5;
 618                 var->transp.length = 0;
 619                 var->transp.offset = 0;
 620                 break;
 621         case 24:
 622                 var->red.offset = 16;
 623                 var->green.offset = 8;
 624                 var->blue.offset = 0;
 625                 var->red.length = 8;
 626                 var->green.length = 8;
 627                 var->blue.length = 8;
 628                 var->transp.length = 0;
 629                 var->transp.offset = 0;
 630                 break;
 631         case 32:
 632                 var->red.offset = 16;
 633                 var->green.offset = 8;
 634                 var->blue.offset = 0;
 635                 var->red.length = 8;
 636                 var->green.length = 8;
 637                 var->blue.length = 8;
 638                 var->transp.length = 8;
 639                 var->transp.offset = 24;
 640                 break;
 641         default:
 642                 return -EINVAL;
 643         }
 644         return 0;
 645 }
 646 EXPORT_SYMBOL(drm_fb_helper_check_var);
 647
 648 /* this will let fbcon do the mode init */
 649 int drm_fb_helper_set_par(struct fb_info *info)
 650 {
 651         struct drm_fb_helper *fb_helper = info->par;
 652         struct drm_device *dev = fb_helper->dev;
 653         struct fb_var_screeninfo *var = &info->var;
 654         struct drm_crtc *crtc;
 655         int ret;
 656         int i;
 657
 658         if (var->pixclock != 0) {
 659                 DRM_ERROR("PIXEL CLOCK SET\n");
 660                 return -EINVAL;
 661         }
 662
 663         mutex_lock(&dev->mode_config.mutex);
 664         for (i = 0; i < fb_helper->crtc_count; i++) {
 665                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 666                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 667                 if (ret) {
 668                         mutex_unlock(&dev->mode_config.mutex);
 669                         return ret;
 670                 }
 671         }
 672         mutex_unlock(&dev->mode_config.mutex);
 673
 674         if (fb_helper->delayed_hotplug) {
 675                 fb_helper->delayed_hotplug = false;
 676                 drm_fb_helper_hotplug_event(fb_helper);
 677         }
 678         return 0;
 679 }
 680 EXPORT_SYMBOL(drm_fb_helper_set_par);
 681
 682 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 683                               struct fb_info *info)
 684 {
 685         struct drm_fb_helper *fb_helper = info->par;
 686         struct drm_device *dev = fb_helper->dev;
 687         struct drm_mode_set *modeset;
 688         struct drm_crtc *crtc;
 689         int ret = 0;
 690         int i;
 691
 692         mutex_lock(&dev->mode_config.mutex);
 693         for (i = 0; i < fb_helper->crtc_count; i++) {
 694                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 695
 696                 modeset = &fb_helper->crtc_info[i].mode_set;
 697
 698                 modeset->x = var->xoffset;
 699                 modeset->y = var->yoffset;
 700
 701                 if (modeset->num_connectors) {
 702                         ret = crtc->funcs->set_config(modeset);
 703                         if (!ret) {
 704                                 info->var.xoffset = var->xoffset;
 705                                 info->var.yoffset = var->yoffset;
 706                         }
 707                 }
 708         }
 709         mutex_unlock(&dev->mode_config.mutex);
 710         return ret;
 711 }
 712 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 713
 714 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 715                                   int preferred_bpp)
 716 {
 717         int new_fb = 0;
 718         int crtc_count = 0;
 719         int i;
 720         struct fb_info *info;
 721         struct drm_fb_helper_surface_size sizes;
 722         int gamma_size = 0;
 723
 724         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 725         sizes.surface_depth = 24;
 726         sizes.surface_bpp = 32;
 727         sizes.fb_width = (unsigned)-1;
 728         sizes.fb_height = (unsigned)-1;
 729
 730         /* if driver picks 8 or 16 by default use that
 731            for both depth/bpp */
 732         if (preferred_bpp != sizes.surface_bpp) {
 733                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 734         }
 735         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 736         for (i = 0; i < fb_helper->connector_count; i++) {
 737                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 738                 struct drm_cmdline_mode *cmdline_mode;
 739
 740                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 741
 742                 if (cmdline_mode->bpp_specified) {
 743                         switch (cmdline_mode->bpp) {
 744                         case 8:
 745                                 sizes.surface_depth = sizes.surface_bpp = 8;
 746                                 break;
 747                         case 15:
 748                                 sizes.surface_depth = 15;
 749                                 sizes.surface_bpp = 16;
 750                                 break;
 751                         case 16:
 752                                 sizes.surface_depth = sizes.surface_bpp = 16;
 753                                 break;
 754                         case 24:
 755                                 sizes.surface_depth = sizes.surface_bpp = 24;
 756                                 break;
 757                         case 32:
 758                                 sizes.surface_depth = 24;
 759                                 sizes.surface_bpp = 32;
 760                                 break;
 761                         }
 762                         break;
 763                 }
 764         }
 765
 766         crtc_count = 0;
 767         for (i = 0; i < fb_helper->crtc_count; i++) {
 768                 struct drm_display_mode *desired_mode;
 769                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 770
 771                 if (desired_mode) {
 772                         if (gamma_size == 0)
 773                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 774                         if (desired_mode->hdisplay < sizes.fb_width)
 775                                 sizes.fb_width = desired_mode->hdisplay;
 776                         if (desired_mode->vdisplay < sizes.fb_height)
 777                                 sizes.fb_height = desired_mode->vdisplay;
 778                         if (desired_mode->hdisplay > sizes.surface_width)
 779                                 sizes.surface_width = desired_mode->hdisplay;
 780                         if (desired_mode->vdisplay > sizes.surface_height)
 781                                 sizes.surface_height = desired_mode->vdisplay;
 782                         crtc_count++;
 783                 }
 784         }
 785
 786         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 787                 /* hmm everyone went away - assume VGA cable just fell out
 788                    and will come back later. */
 789                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 790                 sizes.fb_width = sizes.surface_width = 1024;
 791                 sizes.fb_height = sizes.surface_height = 768;
 792         }
 793
 794         /* push down into drivers */
 795         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 796         if (new_fb < 0)
 797                 return new_fb;
 798
 799         info = fb_helper->fbdev;
 800
 801         /* set the fb pointer */
 802         for (i = 0; i < fb_helper->crtc_count; i++) {
 803                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 804         }
 805
 806         if (new_fb) {
 807                 info->var.pixclock = 0;
 808                 if (register_framebuffer(info) < 0) {
 809                         return -EINVAL;
 810                 }
 811
 812                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 813                        info->fix.id);
 814
 815         } else {
 816                 drm_fb_helper_set_par(info);
 817         }
 818
 819         /* Switch back to kernel console on panic */
 820         /* multi card linked list maybe */
 821         if (list_empty(&kernel_fb_helper_list)) {
 822                 printk(KERN_INFO "drm: registered panic notifier\n");
 823                 atomic_notifier_chain_register(&panic_notifier_list,
 824                                                &paniced);
 825                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 826         }
 827         if (new_fb)
 828                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 829
 830         return 0;
 831 }
 832 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 833
 834 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 835                             uint32_t depth)
 836 {
 837         info->fix.type = FB_TYPE_PACKED_PIXELS;
 838         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 839                 FB_VISUAL_TRUECOLOR;
 840         info->fix.mmio_start = 0;
 841         info->fix.mmio_len = 0;
 842         info->fix.type_aux = 0;
 843         info->fix.xpanstep = 1; /* doing it in hw */
 844         info->fix.ypanstep = 1; /* doing it in hw */
 845         info->fix.ywrapstep = 0;
 846         info->fix.accel = FB_ACCEL_NONE;
 847         info->fix.type_aux = 0;
 848
 849         info->fix.line_length = pitch;
 850         return;
 851 }
 852 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 853
 854 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 855                             uint32_t fb_width, uint32_t fb_height)
 856 {
 857         struct drm_framebuffer *fb = fb_helper->fb;
 858         info->pseudo_palette = fb_helper->pseudo_palette;
 859         info->var.xres_virtual = fb->width;
 860         info->var.yres_virtual = fb->height;
 861         info->var.bits_per_pixel = fb->bits_per_pixel;
 862         info->var.accel_flags = FB_ACCELF_TEXT;
 863         info->var.xoffset = 0;
 864         info->var.yoffset = 0;
 865         info->var.activate = FB_ACTIVATE_NOW;
 866         info->var.height = -1;
 867         info->var.width = -1;
 868
 869         switch (fb->depth) {
 870         case 8:
 871                 info->var.red.offset = 0;
 872                 info->var.green.offset = 0;
 873                 info->var.blue.offset = 0;
 874                 info->var.red.length = 8; /* 8bit DAC */
 875                 info->var.green.length = 8;
 876                 info->var.blue.length = 8;
 877                 info->var.transp.offset = 0;
 878                 info->var.transp.length = 0;
 879                 break;
 880         case 15:
 881                 info->var.red.offset = 10;
 882                 info->var.green.offset = 5;
 883                 info->var.blue.offset = 0;
 884                 info->var.red.length = 5;
 885                 info->var.green.length = 5;
 886                 info->var.blue.length = 5;
 887                 info->var.transp.offset = 15;
 888                 info->var.transp.length = 1;
 889                 break;
 890         case 16:
 891                 info->var.red.offset = 11;
 892                 info->var.green.offset = 5;
 893                 info->var.blue.offset = 0;
 894                 info->var.red.length = 5;
 895                 info->var.green.length = 6;
 896                 info->var.blue.length = 5;
 897                 info->var.transp.offset = 0;
 898                 break;
 899         case 24:
 900                 info->var.red.offset = 16;
 901                 info->var.green.offset = 8;
 902                 info->var.blue.offset = 0;
 903                 info->var.red.length = 8;
 904                 info->var.green.length = 8;
 905                 info->var.blue.length = 8;
 906                 info->var.transp.offset = 0;
 907                 info->var.transp.length = 0;
 908                 break;
 909         case 32:
 910                 info->var.red.offset = 16;
 911                 info->var.green.offset = 8;
 912                 info->var.blue.offset = 0;
 913                 info->var.red.length = 8;
 914                 info->var.green.length = 8;
 915                 info->var.blue.length = 8;
 916                 info->var.transp.offset = 24;
 917                 info->var.transp.length = 8;
 918                 break;
 919         default:
 920                 break;
 921         }
 922
 923         info->var.xres = fb_width;
 924         info->var.yres = fb_height;
 925 }
 926 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 927
 928 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 929                                                uint32_t maxX,
 930                                                uint32_t maxY)
 931 {
 932         struct drm_connector *connector;
 933         int count = 0;
 934         int i;
 935
 936         for (i = 0; i < fb_helper->connector_count; i++) {
 937                 connector = fb_helper->connector_info[i]->connector;
 938                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 939         }
 940
 941         return count;
 942 }
 943
 944 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
 945 {
 946         struct drm_display_mode *mode;
 947
 948         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
 949                 if (drm_mode_width(mode) > width ||
 950                     drm_mode_height(mode) > height)
 951                         continue;
 952                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 953                         return mode;
 954         }
 955         return NULL;
 956 }
 957
 958 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
 959 {
 960         struct drm_cmdline_mode *cmdline_mode;
 961         cmdline_mode = &fb_connector->cmdline_mode;
 962         return cmdline_mode->specified;
 963 }
 964
 965 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 966                                                       int width, int height)
 967 {
 968         struct drm_cmdline_mode *cmdline_mode;
 969         struct drm_display_mode *mode = NULL;
 970
 971         cmdline_mode = &fb_helper_conn->cmdline_mode;
 972         if (cmdline_mode->specified == false)
 973                 return mode;
 974
 975         /* attempt to find a matching mode in the list of modes
 976          *  we have gotten so far, if not add a CVT mode that conforms
 977          */
 978         if (cmdline_mode->rb || cmdline_mode->margins)
 979                 goto create_mode;
 980
 981         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
 982                 /* check width/height */
 983                 if (mode->hdisplay != cmdline_mode->xres ||
 984                     mode->vdisplay != cmdline_mode->yres)
 985                         continue;
 986
 987                 if (cmdline_mode->refresh_specified) {
 988                         if (mode->vrefresh != cmdline_mode->refresh)
 989                                 continue;
 990                 }
 991
 992                 if (cmdline_mode->interlace) {
 993                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
 994                                 continue;
 995                 }
 996                 return mode;
 997         }
 998
 999 create_mode:
1000         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1001                                                  cmdline_mode);
1002         list_add(&mode->head, &fb_helper_conn->connector->modes);
1003         return mode;
1004 }
1005
1006 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1007 {
1008         bool enable;
1009
1010         if (strict) {
1011                 enable = connector->status == connector_status_connected;
1012         } else {
1013                 enable = connector->status != connector_status_disconnected;
1014         }
1015         return enable;
1016 }
1017
1018 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1019                                   bool *enabled)
1020 {
1021         bool any_enabled = false;
1022         struct drm_connector *connector;
1023         int i = 0;
1024
1025         for (i = 0; i < fb_helper->connector_count; i++) {
1026                 connector = fb_helper->connector_info[i]->connector;
1027                 enabled[i] = drm_connector_enabled(connector, true);
1028                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1029                           enabled[i] ? "yes" : "no");
1030                 any_enabled |= enabled[i];
1031         }
1032
1033         if (any_enabled)
1034                 return;
1035
1036         for (i = 0; i < fb_helper->connector_count; i++) {
1037                 connector = fb_helper->connector_info[i]->connector;
1038                 enabled[i] = drm_connector_enabled(connector, false);
1039         }
1040 }
1041
1042 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1043                               struct drm_display_mode **modes,
1044                               bool *enabled, int width, int height)
1045 {
1046         int count, i, j;
1047         bool can_clone = false;
1048         struct drm_fb_helper_connector *fb_helper_conn;
1049         struct drm_display_mode *dmt_mode, *mode;
1050
1051         /* only contemplate cloning in the single crtc case */
1052         if (fb_helper->crtc_count > 1)
1053                 return false;
1054
1055         count = 0;
1056         for (i = 0; i < fb_helper->connector_count; i++) {
1057                 if (enabled[i])
1058                         count++;
1059         }
1060
1061         /* only contemplate cloning if more than one connector is enabled */
1062         if (count <= 1)
1063                 return false;
1064
1065         /* check the command line or if nothing common pick 1024x768 */
1066         can_clone = true;
1067         for (i = 0; i < fb_helper->connector_count; i++) {
1068                 if (!enabled[i])
1069                         continue;
1070                 fb_helper_conn = fb_helper->connector_info[i];
1071                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1072                 if (!modes[i]) {
1073                         can_clone = false;
1074                         break;
1075                 }
1076                 for (j = 0; j < i; j++) {
1077                         if (!enabled[j])
1078                                 continue;
1079                         if (!drm_mode_equal(modes[j], modes[i]))
1080                                 can_clone = false;
1081                 }
1082         }
1083
1084         if (can_clone) {
1085                 DRM_DEBUG_KMS("can clone using command line\n");
1086                 return true;
1087         }
1088
1089         /* try and find a 1024x768 mode on each connector */
1090         can_clone = true;
1091         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1092
1093         for (i = 0; i < fb_helper->connector_count; i++) {
1094
1095                 if (!enabled[i])
1096                         continue;
1097
1098                 fb_helper_conn = fb_helper->connector_info[i];
1099                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1100                         if (drm_mode_equal(mode, dmt_mode))
1101                                 modes[i] = mode;
1102                 }
1103                 if (!modes[i])
1104                         can_clone = false;
1105         }
1106
1107         if (can_clone) {
1108                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1109                 return true;
1110         }
1111         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1112         return false;
1113 }
1114
1115 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1116                                  struct drm_display_mode **modes,
1117                                  bool *enabled, int width, int height)
1118 {
1119         struct drm_fb_helper_connector *fb_helper_conn;
1120         int i;
1121
1122         for (i = 0; i < fb_helper->connector_count; i++) {
1123                 fb_helper_conn = fb_helper->connector_info[i];
1124
1125                 if (enabled[i] == false)
1126                         continue;
1127
1128                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1129                               fb_helper_conn->connector->base.id);
1130
1131                 /* got for command line mode first */
1132                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1133                 if (!modes[i]) {
1134                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1135                                       fb_helper_conn->connector->base.id);
1136                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1137                 }
1138                 /* No preferred modes, pick one off the list */
1139                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1140                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1141                                 break;
1142                 }
1143                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1144                           "none");
1145         }
1146         return true;
1147 }
1148
1149 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1150                           struct drm_fb_helper_crtc **best_crtcs,
1151                           struct drm_display_mode **modes,
1152                           int n, int width, int height)
1153 {
1154         int c, o;
1155         struct drm_device *dev = fb_helper->dev;
1156         struct drm_connector *connector;
1157         struct drm_connector_helper_funcs *connector_funcs;
1158         struct drm_encoder *encoder;
1159         struct drm_fb_helper_crtc *best_crtc;
1160         int my_score, best_score, score;
1161         struct drm_fb_helper_crtc **crtcs, *crtc;
1162         struct drm_fb_helper_connector *fb_helper_conn;
1163
1164         if (n == fb_helper->connector_count)
1165                 return 0;
1166
1167         fb_helper_conn = fb_helper->connector_info[n];
1168         connector = fb_helper_conn->connector;
1169
1170         best_crtcs[n] = NULL;
1171         best_crtc = NULL;
1172         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1173         if (modes[n] == NULL)
1174                 return best_score;
1175
1176         crtcs = kzalloc(dev->mode_config.num_connector *
1177                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1178         if (!crtcs)
1179                 return best_score;
1180
1181         my_score = 1;
1182         if (connector->status == connector_status_connected)
1183                 my_score++;
1184         if (drm_has_cmdline_mode(fb_helper_conn))
1185                 my_score++;
1186         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1187                 my_score++;
1188
1189         connector_funcs = connector->helper_private;
1190         encoder = connector_funcs->best_encoder(connector);
1191         if (!encoder)
1192                 goto out;
1193
1194         /* select a crtc for this connector and then attempt to configure
1195            remaining connectors */
1196         for (c = 0; c < fb_helper->crtc_count; c++) {
1197                 crtc = &fb_helper->crtc_info[c];
1198
1199                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1200                         continue;
1201                 }
1202
1203                 for (o = 0; o < n; o++)
1204                         if (best_crtcs[o] == crtc)
1205                                 break;
1206
1207                 if (o < n) {
1208                         /* ignore cloning unless only a single crtc */
1209                         if (fb_helper->crtc_count > 1)
1210                                 continue;
1211
1212                         if (!drm_mode_equal(modes[o], modes[n]))
1213                                 continue;
1214                 }
1215
1216                 crtcs[n] = crtc;
1217                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1218                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1219                                                   width, height);
1220                 if (score > best_score) {
1221                         best_crtc = crtc;
1222                         best_score = score;
1223                         memcpy(best_crtcs, crtcs,
1224                                dev->mode_config.num_connector *
1225                                sizeof(struct drm_fb_helper_crtc *));
1226                 }
1227         }
1228 out:
1229         kfree(crtcs);
1230         return best_score;
1231 }
1232
1233 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1234 {
1235         struct drm_device *dev = fb_helper->dev;
1236         struct drm_fb_helper_crtc **crtcs;
1237         struct drm_display_mode **modes;
1238         struct drm_encoder *encoder;
1239         struct drm_mode_set *modeset;
1240         bool *enabled;
1241         int width, height;
1242         int i, ret;
1243
1244         DRM_DEBUG_KMS("\n");
1245
1246         width = dev->mode_config.max_width;
1247         height = dev->mode_config.max_height;
1248
1249         /* clean out all the encoder/crtc combos */
1250         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1251                 encoder->crtc = NULL;
1252         }
1253
1254         crtcs = kcalloc(dev->mode_config.num_connector,
1255                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1256         modes = kcalloc(dev->mode_config.num_connector,
1257                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1258         enabled = kcalloc(dev->mode_config.num_connector,
1259                           sizeof(bool), GFP_KERNEL);
1260
1261         drm_enable_connectors(fb_helper, enabled);
1262
1263         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1264         if (!ret) {
1265                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1266                 if (!ret)
1267                         DRM_ERROR("Unable to find initial modes\n");
1268         }
1269
1270         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1271
1272         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1273
1274         /* need to set the modesets up here for use later */
1275         /* fill out the connector<->crtc mappings into the modesets */
1276         for (i = 0; i < fb_helper->crtc_count; i++) {
1277                 modeset = &fb_helper->crtc_info[i].mode_set;
1278                 modeset->num_connectors = 0;
1279         }
1280
1281         for (i = 0; i < fb_helper->connector_count; i++) {
1282                 struct drm_display_mode *mode = modes[i];
1283                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1284                 modeset = &fb_crtc->mode_set;
1285
1286                 if (mode && fb_crtc) {
1287                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1288                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1289                         fb_crtc->desired_mode = mode;
1290                         if (modeset->mode)
1291                                 drm_mode_destroy(dev, modeset->mode);
1292                         modeset->mode = drm_mode_duplicate(dev,
1293                                                            fb_crtc->desired_mode);
1294                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1295                 }
1296         }
1297
1298         kfree(crtcs);
1299         kfree(modes);
1300         kfree(enabled);
1301 }
1302
1303 /**
1304  * drm_helper_initial_config - setup a sane initial connector configuration
1305  * @dev: DRM device
1306  *
1307  * LOCKING:
1308  * Called at init time, must take mode config lock.
1309  *
1310  * Scan the CRTCs and connectors and try to put together an initial setup.
1311  * At the moment, this is a cloned configuration across all heads with
1312  * a new framebuffer object as the backing store.
1313  *
1314  * RETURNS:
1315  * Zero if everything went ok, nonzero otherwise.
1316  */
1317 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1318 {
1319         struct drm_device *dev = fb_helper->dev;
1320         int count = 0;
1321
1322         /* disable all the possible outputs/crtcs before entering KMS mode */
1323         drm_helper_disable_unused_functions(fb_helper->dev);
1324
1325         drm_fb_helper_parse_command_line(fb_helper);
1326
1327         count = drm_fb_helper_probe_connector_modes(fb_helper,
1328                                                     dev->mode_config.max_width,
1329                                                     dev->mode_config.max_height);
1330         /*
1331          * we shouldn't end up with no modes here.
1332          */
1333         if (count == 0) {
1334                 printk(KERN_INFO "No connectors reported connected with modes\n");
1335         }
1336         drm_setup_crtcs(fb_helper);
1337
1338         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1339 }
1340 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1341
1342 /**
1343  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1344  *                               probing all the outputs attached to the fb.
1345  * @fb_helper: the drm_fb_helper
1346  *
1347  * LOCKING:
1348  * Called at runtime, must take mode config lock.
1349  *
1350  * Scan the connectors attached to the fb_helper and try to put together a
1351  * setup after *notification of a change in output configuration.
1352  *
1353  * RETURNS:
1354  * 0 on success and a non-zero error code otherwise.
1355  */
1356 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1357 {
1358         struct drm_device *dev = fb_helper->dev;
1359         int count = 0;
1360         u32 max_width, max_height, bpp_sel;
1361         bool bound = false, crtcs_bound = false;
1362         struct drm_crtc *crtc;
1363
1364         if (!fb_helper->fb)
1365                 return 0;
1366
1367         mutex_lock(&dev->mode_config.mutex);
1368         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1369                 if (crtc->fb)
1370                         crtcs_bound = true;
1371                 if (crtc->fb == fb_helper->fb)
1372                         bound = true;
1373         }
1374
1375         if (!bound && crtcs_bound) {
1376                 fb_helper->delayed_hotplug = true;
1377                 mutex_unlock(&dev->mode_config.mutex);
1378                 return 0;
1379         }
1380         DRM_DEBUG_KMS("\n");
1381
1382         max_width = fb_helper->fb->width;
1383         max_height = fb_helper->fb->height;
1384         bpp_sel = fb_helper->fb->bits_per_pixel;
1385
1386         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1387                                                     max_height);
1388         drm_setup_crtcs(fb_helper);
1389         mutex_unlock(&dev->mode_config.mutex);
1390
1391         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1392 }
1393 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1394
1395 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1396  * but the module doesn't depend on any fb console symbols.  At least
1397  * attempt to load fbcon to avoid leaving the system without a usable console.
1398  */
1399 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1400 static int __init drm_fb_helper_modinit(void)
1401 {
1402         const char *name = "fbcon";
1403         struct module *fbcon;
1404
1405         mutex_lock(&module_mutex);
1406         fbcon = find_module(name);
1407         mutex_unlock(&module_mutex);
1408
1409         if (!fbcon)
1410                 request_module_nowait(name);
1411         return 0;
1412 }
1413
1414 module_init(drm_fb_helper_modinit);
1415 #endif