sys/dev/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  * $FreeBSD: src/sys/dev/drm2/drm_fb_helper.c,v 1.1 2012/05/22 11:07:44 kib Exp $
  31  */
  32
  33 #include <linux/export.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_crtc.h>
  36 #include <drm/drm_fb_helper.h>
  37 #include <drm/drm_crtc_helper.h>
  38
  39 static LINUX_LIST_HEAD(kernel_fb_helper_list);
  40
  41 /* simple single crtc case helper function */
  42 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  43 {
  44         struct drm_device *dev = fb_helper->dev;
  45         struct drm_connector *connector;
  46
  47         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  48                 struct drm_fb_helper_connector *fb_helper_connector;
  49
  50                 fb_helper_connector = kmalloc(
  51                     sizeof(struct drm_fb_helper_connector), M_DRM,
  52                     M_WAITOK | M_ZERO);
  53
  54                 fb_helper_connector->connector = connector;
  55                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  56         }
  57         return 0;
  58 }
  59
  60 const char *fb_mode_option;
  61
  62 static int
  63 fb_get_options(const char *connector_name, char **option)
  64 {
  65
  66         return (1);
  67 }
  68
  69 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
  70 {
  71         struct drm_fb_helper_connector *fb_helper_conn;
  72         int i;
  73
  74         for (i = 0; i < fb_helper->connector_count; i++) {
  75                 struct drm_cmdline_mode *mode;
  76                 struct drm_connector *connector;
  77                 char *option = NULL;
  78
  79                 fb_helper_conn = fb_helper->connector_info[i];
  80                 connector = fb_helper_conn->connector;
  81                 mode = &fb_helper_conn->cmdline_mode;
  82
  83                 /* do something on return - turn off connector maybe */
  84                 if (fb_get_options(drm_get_connector_name(connector), &option))
  85                         continue;
  86
  87                 if (drm_mode_parse_command_line_for_connector(option,
  88                                                               connector,
  89                                                               mode)) {
  90                         if (mode->force) {
  91                                 const char *s;
  92                                 switch (mode->force) {
  93                                 case DRM_FORCE_OFF:
  94                                         s = "OFF";
  95                                         break;
  96                                 case DRM_FORCE_ON_DIGITAL:
  97                                         s = "ON - dig";
  98                                         break;
  99                                 default:
 100                                 case DRM_FORCE_ON:
 101                                         s = "ON";
 102                                         break;
 103                                 }
 104
 105                                 DRM_INFO("forcing %s connector %s\n",
 106                                          drm_get_connector_name(connector), s);
 107                                 connector->force = mode->force;
 108                         }
 109
 110                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 111                                       drm_get_connector_name(connector),
 112                                       mode->xres, mode->yres,
 113                                       mode->refresh_specified ? mode->refresh : 60,
 114                                       mode->rb ? " reduced blanking" : "",
 115                                       mode->margins ? " with margins" : "",
 116                                       mode->interlace ?  " interlaced" : "");
 117                 }
 118
 119         }
 120         return 0;
 121 }
 122
 123 #if 0
 124 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 125 {
 126         uint16_t *r_base, *g_base, *b_base;
 127         int i;
 128
 129         r_base = crtc->gamma_store;
 130         g_base = r_base + crtc->gamma_size;
 131         b_base = g_base + crtc->gamma_size;
 132
 133         for (i = 0; i < crtc->gamma_size; i++)
 134                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 135 }
 136
 137 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 138 {
 139         uint16_t *r_base, *g_base, *b_base;
 140
 141         r_base = crtc->gamma_store;
 142         g_base = r_base + crtc->gamma_size;
 143         b_base = g_base + crtc->gamma_size;
 144
 145         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 146 }
 147 #endif
 148
 149 #if 0
 150 int drm_fb_helper_debug_enter(struct fb_info *info)
 151 {
 152         struct drm_fb_helper *helper = info->par;
 153         struct drm_crtc_helper_funcs *funcs;
 154         int i;
 155
 156         if (list_empty(&kernel_fb_helper_list))
 157                 return false;
 158
 159         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 160                 for (i = 0; i < helper->crtc_count; i++) {
 161                         struct drm_mode_set *mode_set =
 162                                 &helper->crtc_info[i].mode_set;
 163
 164                         if (!mode_set->crtc->enabled)
 165                                 continue;
 166
 167                         funcs = mode_set->crtc->helper_private;
 168                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 169                         funcs->mode_set_base_atomic(mode_set->crtc,
 170                                                     mode_set->fb,
 171                                                     mode_set->x,
 172                                                     mode_set->y,
 173                                                     ENTER_ATOMIC_MODE_SET);
 174                 }
 175         }
 176
 177         return 0;
 178 }
 179 #endif
 180
 181 #if 0
 182 /* Find the real fb for a given fb helper CRTC */
 183 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 184 {
 185         struct drm_device *dev = crtc->dev;
 186         struct drm_crtc *c;
 187
 188         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 189                 if (crtc->base.id == c->base.id)
 190                         return c->fb;
 191         }
 192
 193         return NULL;
 194 }
 195 #endif
 196
 197 #if 0
 198 int drm_fb_helper_debug_leave(struct fb_info *info)
 199 {
 200         struct drm_fb_helper *helper = info->par;
 201         struct drm_crtc *crtc;
 202         struct drm_crtc_helper_funcs *funcs;
 203         struct drm_framebuffer *fb;
 204         int i;
 205
 206         for (i = 0; i < helper->crtc_count; i++) {
 207                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 208                 crtc = mode_set->crtc;
 209                 funcs = crtc->helper_private;
 210                 fb = drm_mode_config_fb(crtc);
 211
 212                 if (!crtc->enabled)
 213                         continue;
 214
 215                 if (!fb) {
 216                         DRM_ERROR("no fb to restore??\n");
 217                         continue;
 218                 }
 219
 220                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 221                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 222                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 223         }
 224
 225         return 0;
 226 }
 227 #endif
 228
 229 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 230 {
 231         bool error = false;
 232         int i, ret;
 233         for (i = 0; i < fb_helper->crtc_count; i++) {
 234                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 235                 ret = drm_crtc_helper_set_config(mode_set);
 236                 if (ret)
 237                         error = true;
 238         }
 239         return error;
 240 }
 241
 242 #if 0
 243 bool drm_fb_helper_force_kernel_mode(void)
 244 {
 245         bool ret, error = false;
 246         struct drm_fb_helper *helper;
 247
 248         if (list_empty(&kernel_fb_helper_list))
 249                 return false;
 250
 251         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 252                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 253                         continue;
 254
 255                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 256                 if (ret)
 257                         error = true;
 258         }
 259         return error;
 260 }
 261 #endif
 262
 263 #if 0
 264 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 265                         void *panic_str)
 266 {
 267         printf("panic occurred, switching back to text console\n");
 268         return drm_fb_helper_force_kernel_mode();
 269         return 0;
 270 }
 271
 272 static struct notifier_block paniced = {
 273         .notifier_call = drm_fb_helper_panic,
 274 };
 275
 276 /**
 277  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 278  *
 279  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 280  */
 281 void drm_fb_helper_restore(void)
 282 {
 283         bool ret;
 284         ret = drm_fb_helper_force_kernel_mode();
 285         if (ret == true)
 286                 DRM_ERROR("Failed to restore crtc configuration\n");
 287 }
 288
 289 #ifdef CONFIG_MAGIC_SYSRQ
 290 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 291 {
 292         drm_fb_helper_restore();
 293 }
 294 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 295
 296 static void drm_fb_helper_sysrq(int dummy1)
 297 {
 298         schedule_work(&drm_fb_helper_restore_work);
 299 }
 300
 301 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 302         .handler = drm_fb_helper_sysrq,
 303         .help_msg = "force-fb(V)",
 304         .action_msg = "Restore framebuffer console",
 305 };
 306 #else
 307 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 308 #endif
 309 #endif
 310
 311 #if 0
 312 static void drm_fb_helper_on(struct fb_info *info)
 313 {
 314         struct drm_fb_helper *fb_helper = info->par;
 315         struct drm_device *dev = fb_helper->dev;
 316         struct drm_crtc *crtc;
 317         struct drm_crtc_helper_funcs *crtc_funcs;
 318         struct drm_connector *connector;
 319         struct drm_encoder *encoder;
 320         int i, j;
 321
 322         /*
 323          * For each CRTC in this fb, turn the crtc on then,
 324          * find all associated encoders and turn them on.
 325          */
 326         sx_xlock(&dev->mode_config.mutex);
 327         for (i = 0; i < fb_helper->crtc_count; i++) {
 328                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 329                 crtc_funcs = crtc->helper_private;
 330
 331                 if (!crtc->enabled)
 332                         continue;
 333
 334                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 335
 336                 /* Walk the connectors & encoders on this fb turning them on */
 337                 for (j = 0; j < fb_helper->connector_count; j++) {
 338                         connector = fb_helper->connector_info[j]->connector;
 339                         connector->dpms = DRM_MODE_DPMS_ON;
 340                         drm_connector_property_set_value(connector,
 341                                                          dev->mode_config.dpms_property,
 342                                                          DRM_MODE_DPMS_ON);
 343                 }
 344                 /* Found a CRTC on this fb, now find encoders */
 345                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 346                         if (encoder->crtc == crtc) {
 347                                 struct drm_encoder_helper_funcs *encoder_funcs;
 348
 349                                 encoder_funcs = encoder->helper_private;
 350                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 351                         }
 352                 }
 353         }
 354         sx_xunlock(&dev->mode_config.mutex);
 355 }
 356 #endif
 357
 358 #if 0
 359 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 360 {
 361         struct drm_fb_helper *fb_helper = info->par;
 362         struct drm_device *dev = fb_helper->dev;
 363         struct drm_crtc *crtc;
 364         struct drm_crtc_helper_funcs *crtc_funcs;
 365         struct drm_connector *connector;
 366         struct drm_encoder *encoder;
 367         int i, j;
 368
 369         /*
 370          * For each CRTC in this fb, find all associated encoders
 371          * and turn them off, then turn off the CRTC.
 372          */
 373         sx_xlock(&dev->mode_config.mutex);
 374         for (i = 0; i < fb_helper->crtc_count; i++) {
 375                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 376                 crtc_funcs = crtc->helper_private;
 377
 378                 if (!crtc->enabled)
 379                         continue;
 380
 381                 /* Walk the connectors on this fb and mark them off */
 382                 for (j = 0; j < fb_helper->connector_count; j++) {
 383                         connector = fb_helper->connector_info[j]->connector;
 384                         connector->dpms = dpms_mode;
 385                         drm_connector_property_set_value(connector,
 386                                                          dev->mode_config.dpms_property,
 387                                                          dpms_mode);
 388                 }
 389                 /* Found a CRTC on this fb, now find encoders */
 390                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 391                         if (encoder->crtc == crtc) {
 392                                 struct drm_encoder_helper_funcs *encoder_funcs;
 393
 394                                 encoder_funcs = encoder->helper_private;
 395                                 encoder_funcs->dpms(encoder, dpms_mode);
 396                         }
 397                 }
 398                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 399         }
 400         sx_xunlock(&dev->mode_config.mutex);
 401 }
 402 #endif
 403
 404 #if 0
 405 int drm_fb_helper_blank(int blank, struct fb_info *info)
 406 {
 407         switch (blank) {
 408         /* Display: On; HSync: On, VSync: On */
 409         case FB_BLANK_UNBLANK:
 410                 drm_fb_helper_on(info);
 411                 break;
 412         /* Display: Off; HSync: On, VSync: On */
 413         case FB_BLANK_NORMAL:
 414                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 415                 break;
 416         /* Display: Off; HSync: Off, VSync: On */
 417         case FB_BLANK_HSYNC_SUSPEND:
 418                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 419                 break;
 420         /* Display: Off; HSync: On, VSync: Off */
 421         case FB_BLANK_VSYNC_SUSPEND:
 422                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 423                 break;
 424         /* Display: Off; HSync: Off, VSync: Off */
 425         case FB_BLANK_POWERDOWN:
 426                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 427                 break;
 428         }
 429         return 0;
 430 }
 431 #endif
 432
 433 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 434 {
 435         int i;
 436
 437         for (i = 0; i < helper->connector_count; i++)
 438                 drm_free(helper->connector_info[i], M_DRM);
 439         drm_free(helper->connector_info, M_DRM);
 440         for (i = 0; i < helper->crtc_count; i++) {
 441                 drm_free(helper->crtc_info[i].mode_set.connectors, M_DRM);
 442                 if (helper->crtc_info[i].mode_set.mode)
 443                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 444         }
 445         drm_free(helper->crtc_info, M_DRM);
 446 }
 447
 448 int drm_fb_helper_init(struct drm_device *dev,
 449                        struct drm_fb_helper *fb_helper,
 450                        int crtc_count, int max_conn_count)
 451 {
 452         struct drm_crtc *crtc;
 453         int i;
 454
 455         fb_helper->dev = dev;
 456
 457         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 458
 459         fb_helper->crtc_info = kmalloc(crtc_count *
 460             sizeof(struct drm_fb_helper_crtc), M_DRM, M_WAITOK | M_ZERO);
 461         if (!fb_helper->crtc_info)
 462                 return -ENOMEM;
 463
 464         fb_helper->crtc_count = crtc_count;
 465         fb_helper->connector_info = kmalloc(dev->mode_config.num_connector *
 466             sizeof(struct drm_fb_helper_connector *), M_DRM,
 467             M_WAITOK | M_ZERO);
 468         if (!fb_helper->connector_info) {
 469                 kfree(fb_helper->crtc_info);
 470                 return -ENOMEM;
 471         }
 472         fb_helper->connector_count = 0;
 473
 474         for (i = 0; i < crtc_count; i++) {
 475                 fb_helper->crtc_info[i].mode_set.connectors =
 476                         kmalloc(max_conn_count * sizeof(struct drm_connector *),
 477                             M_DRM, M_WAITOK | M_ZERO);
 478
 479                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 480                         goto out_free;
 481                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 482         }
 483
 484         i = 0;
 485         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 486                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 487                 i++;
 488         }
 489
 490         return 0;
 491 out_free:
 492         drm_fb_helper_crtc_free(fb_helper);
 493         return -ENOMEM;
 494 }
 495 EXPORT_SYMBOL(drm_fb_helper_init);
 496
 497 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 498 {
 499         if (!list_empty(&fb_helper->kernel_fb_list)) {
 500                 list_del(&fb_helper->kernel_fb_list);
 501                 if (list_empty(&kernel_fb_helper_list)) {
 502 #if 0
 503                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 504                         atomic_notifier_chain_unregister(&panic_notifier_list,
 505                                                          &paniced);
 506                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 507 #endif
 508                 }
 509         }
 510
 511         drm_fb_helper_crtc_free(fb_helper);
 512
 513 }
 514
 515 #if 0
 516 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 517                      u16 blue, u16 regno, struct fb_info *info)
 518 {
 519         struct drm_fb_helper *fb_helper = info->par;
 520         struct drm_framebuffer *fb = fb_helper->fb;
 521         int pindex;
 522
 523         if (info->fix.visual == FB_VISUAL_trueCOLOR) {
 524                 u32 *palette;
 525                 u32 value;
 526                 /* place color in psuedopalette */
 527                 if (regno > 16)
 528                         return -EINVAL;
 529                 palette = (u32 *)info->pseudo_palette;
 530                 red >>= (16 - info->var.red.length);
 531                 green >>= (16 - info->var.green.length);
 532                 blue >>= (16 - info->var.blue.length);
 533                 value = (red << info->var.red.offset) |
 534                         (green << info->var.green.offset) |
 535                         (blue << info->var.blue.offset);
 536                 if (info->var.transp.length > 0) {
 537                         u32 mask = (1 << info->var.transp.length) - 1;
 538                         mask <<= info->var.transp.offset;
 539                         value |= mask;
 540                 }
 541                 palette[regno] = value;
 542                 return 0;
 543         }
 544
 545         pindex = regno;
 546
 547         if (fb->bits_per_pixel == 16) {
 548                 pindex = regno << 3;
 549
 550                 if (fb->depth == 16 && regno > 63)
 551                         return -EINVAL;
 552                 if (fb->depth == 15 && regno > 31)
 553                         return -EINVAL;
 554
 555                 if (fb->depth == 16) {
 556                         u16 r, g, b;
 557                         int i;
 558                         if (regno < 32) {
 559                                 for (i = 0; i < 8; i++)
 560                                         fb_helper->funcs->gamma_set(crtc, red,
 561                                                 green, blue, pindex + i);
 562                         }
 563
 564                         fb_helper->funcs->gamma_get(crtc, &r,
 565                                                     &g, &b,
 566                                                     pindex >> 1);
 567
 568                         for (i = 0; i < 4; i++)
 569                                 fb_helper->funcs->gamma_set(crtc, r,
 570                                                             green, b,
 571                                                             (pindex >> 1) + i);
 572                 }
 573         }
 574
 575         if (fb->depth != 16)
 576                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 577         return 0;
 578 }
 579 #endif
 580
 581 #if 0
 582 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 583 {
 584         struct drm_fb_helper *fb_helper = info->par;
 585         struct drm_crtc_helper_funcs *crtc_funcs;
 586         u16 *red, *green, *blue, *transp;
 587         struct drm_crtc *crtc;
 588         int i, j, rc = 0;
 589         int start;
 590
 591         for (i = 0; i < fb_helper->crtc_count; i++) {
 592                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 593                 crtc_funcs = crtc->helper_private;
 594
 595                 red = cmap->red;
 596                 green = cmap->green;
 597                 blue = cmap->blue;
 598                 transp = cmap->transp;
 599                 start = cmap->start;
 600
 601                 for (j = 0; j < cmap->len; j++) {
 602                         u16 hred, hgreen, hblue, htransp = 0xffff;
 603
 604                         hred = *red++;
 605                         hgreen = *green++;
 606                         hblue = *blue++;
 607
 608                         if (transp)
 609                                 htransp = *transp++;
 610
 611                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 612                         if (rc)
 613                                 return rc;
 614                 }
 615                 crtc_funcs->load_lut(crtc);
 616         }
 617         return rc;
 618 }
 619 #endif
 620
 621 #if 0
 622 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 623                             struct fb_info *info)
 624 {
 625         struct drm_fb_helper *fb_helper = info->par;
 626         struct drm_framebuffer *fb = fb_helper->fb;
 627         int depth;
 628
 629         if (var->pixclock != 0 || in_dbg_master())
 630                 return -EINVAL;
 631
 632         /* Need to resize the fb object !!! */
 633         if (var->bits_per_pixel > fb->bits_per_pixel ||
 634             var->xres > fb->width || var->yres > fb->height ||
 635             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 636                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 637                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 638                           var->xres, var->yres, var->bits_per_pixel,
 639                           var->xres_virtual, var->yres_virtual,
 640                           fb->width, fb->height, fb->bits_per_pixel);
 641                 return -EINVAL;
 642         }
 643
 644         switch (var->bits_per_pixel) {
 645         case 16:
 646                 depth = (var->green.length == 6) ? 16 : 15;
 647                 break;
 648         case 32:
 649                 depth = (var->transp.length > 0) ? 32 : 24;
 650                 break;
 651         default:
 652                 depth = var->bits_per_pixel;
 653                 break;
 654         }
 655
 656         switch (depth) {
 657         case 8:
 658                 var->red.offset = 0;
 659                 var->green.offset = 0;
 660                 var->blue.offset = 0;
 661                 var->red.length = 8;
 662                 var->green.length = 8;
 663                 var->blue.length = 8;
 664                 var->transp.length = 0;
 665                 var->transp.offset = 0;
 666                 break;
 667         case 15:
 668                 var->red.offset = 10;
 669                 var->green.offset = 5;
 670                 var->blue.offset = 0;
 671                 var->red.length = 5;
 672                 var->green.length = 5;
 673                 var->blue.length = 5;
 674                 var->transp.length = 1;
 675                 var->transp.offset = 15;
 676                 break;
 677         case 16:
 678                 var->red.offset = 11;
 679                 var->green.offset = 5;
 680                 var->blue.offset = 0;
 681                 var->red.length = 5;
 682                 var->green.length = 6;
 683                 var->blue.length = 5;
 684                 var->transp.length = 0;
 685                 var->transp.offset = 0;
 686                 break;
 687         case 24:
 688                 var->red.offset = 16;
 689                 var->green.offset = 8;
 690                 var->blue.offset = 0;
 691                 var->red.length = 8;
 692                 var->green.length = 8;
 693                 var->blue.length = 8;
 694                 var->transp.length = 0;
 695                 var->transp.offset = 0;
 696                 break;
 697         case 32:
 698                 var->red.offset = 16;
 699                 var->green.offset = 8;
 700                 var->blue.offset = 0;
 701                 var->red.length = 8;
 702                 var->green.length = 8;
 703                 var->blue.length = 8;
 704                 var->transp.length = 8;
 705                 var->transp.offset = 24;
 706                 break;
 707         default:
 708                 return -EINVAL;
 709         }
 710         return 0;
 711 }
 712 #endif
 713
 714 #if 0
 715 /* this will let fbcon do the mode init */
 716 int drm_fb_helper_set_par(struct fb_info *info)
 717 {
 718         struct drm_fb_helper *fb_helper = info->par;
 719         struct drm_device *dev = fb_helper->dev;
 720         struct fb_var_screeninfo *var = &info->var;
 721         struct drm_crtc *crtc;
 722         int ret;
 723         int i;
 724
 725         if (var->pixclock != 0) {
 726                 DRM_ERROR("PIXEL CLOCK SET\n");
 727                 return -EINVAL;
 728         }
 729
 730         mutex_lock(&dev->mode_config.mutex);
 731         for (i = 0; i < fb_helper->crtc_count; i++) {
 732                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 733                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 734                 if (ret) {
 735                         mutex_unlock(&dev->mode_config.mutex);
 736                         return ret;
 737                 }
 738         }
 739         mutex_unlock(&dev->mode_config.mutex);
 740
 741         if (fb_helper->delayed_hotplug) {
 742                 fb_helper->delayed_hotplug = false;
 743                 drm_fb_helper_hotplug_event(fb_helper);
 744         }
 745         return 0;
 746 }
 747 #endif
 748
 749 #if 0
 750 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 751                               struct fb_info *info)
 752 {
 753         struct drm_fb_helper *fb_helper = info->par;
 754         struct drm_device *dev = fb_helper->dev;
 755         struct drm_mode_set *modeset;
 756         struct drm_crtc *crtc;
 757         int ret = 0;
 758         int i;
 759
 760         mutex_lock(&dev->mode_config.mutex);
 761         for (i = 0; i < fb_helper->crtc_count; i++) {
 762                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 763
 764                 modeset = &fb_helper->crtc_info[i].mode_set;
 765
 766                 modeset->x = var->xoffset;
 767                 modeset->y = var->yoffset;
 768
 769                 if (modeset->num_connectors) {
 770                         ret = crtc->funcs->set_config(modeset);
 771                         if (!ret) {
 772                                 info->var.xoffset = var->xoffset;
 773                                 info->var.yoffset = var->yoffset;
 774                         }
 775                 }
 776         }
 777         mutex_unlock(&dev->mode_config.mutex);
 778         return ret;
 779 }
 780 #endif
 781
 782 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 783                                   int preferred_bpp)
 784 {
 785         int new_fb = 0;
 786         int crtc_count = 0;
 787         int i;
 788 #if 0
 789         struct fb_info *info;
 790 #endif
 791         struct drm_fb_helper_surface_size sizes;
 792         int gamma_size = 0;
 793
 794         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 795         sizes.surface_depth = 24;
 796         sizes.surface_bpp = 32;
 797         sizes.fb_width = (unsigned)-1;
 798         sizes.fb_height = (unsigned)-1;
 799
 800         /* if driver picks 8 or 16 by default use that
 801            for both depth/bpp */
 802         if (preferred_bpp != sizes.surface_bpp)
 803                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 804
 805         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 806         for (i = 0; i < fb_helper->connector_count; i++) {
 807                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 808                 struct drm_cmdline_mode *cmdline_mode;
 809
 810                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 811
 812                 if (cmdline_mode->bpp_specified) {
 813                         switch (cmdline_mode->bpp) {
 814                         case 8:
 815                                 sizes.surface_depth = sizes.surface_bpp = 8;
 816                                 break;
 817                         case 15:
 818                                 sizes.surface_depth = 15;
 819                                 sizes.surface_bpp = 16;
 820                                 break;
 821                         case 16:
 822                                 sizes.surface_depth = sizes.surface_bpp = 16;
 823                                 break;
 824                         case 24:
 825                                 sizes.surface_depth = sizes.surface_bpp = 24;
 826                                 break;
 827                         case 32:
 828                                 sizes.surface_depth = 24;
 829                                 sizes.surface_bpp = 32;
 830                                 break;
 831                         }
 832                         break;
 833                 }
 834         }
 835
 836         crtc_count = 0;
 837         for (i = 0; i < fb_helper->crtc_count; i++) {
 838                 struct drm_display_mode *desired_mode;
 839                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 840
 841                 if (desired_mode) {
 842                         if (gamma_size == 0)
 843                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 844                         if (desired_mode->hdisplay < sizes.fb_width)
 845                                 sizes.fb_width = desired_mode->hdisplay;
 846                         if (desired_mode->vdisplay < sizes.fb_height)
 847                                 sizes.fb_height = desired_mode->vdisplay;
 848                         if (desired_mode->hdisplay > sizes.surface_width)
 849                                 sizes.surface_width = desired_mode->hdisplay;
 850                         if (desired_mode->vdisplay > sizes.surface_height)
 851                                 sizes.surface_height = desired_mode->vdisplay;
 852                         crtc_count++;
 853                 }
 854         }
 855
 856         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 857                 /* hmm everyone went away - assume VGA cable just fell out
 858                    and will come back later. */
 859                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 860                 sizes.fb_width = sizes.surface_width = 1024;
 861                 sizes.fb_height = sizes.surface_height = 768;
 862         }
 863
 864         /* push down into drivers */
 865         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 866         if (new_fb < 0)
 867                 return new_fb;
 868
 869 #if 0
 870         info = fb_helper->fbdev;
 871 #endif
 872
 873         /* set the fb pointer */
 874         for (i = 0; i < fb_helper->crtc_count; i++)
 875                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 876
 877 #if 0
 878         if (new_fb) {
 879                 info->var.pixclock = 0;
 880                 if (register_framebuffer(info) < 0)
 881                         return -EINVAL;
 882
 883                 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 884                                 info->node, info->fix.id);
 885
 886         } else {
 887                 drm_fb_helper_set_par(info);
 888         }
 889
 890         /* Switch back to kernel console on panic */
 891         /* multi card linked list maybe */
 892         if (list_empty(&kernel_fb_helper_list)) {
 893                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
 894                 atomic_notifier_chain_register(&panic_notifier_list,
 895                                                &paniced);
 896                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 897         }
 898         if (new_fb)
 899                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 900 #endif
 901
 902         return 0;
 903 }
 904 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 905
 906 #if 0
 907 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 908                             uint32_t depth)
 909 {
 910         info->fix.type = FB_TYPE_PACKED_PIXELS;
 911         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 912                 FB_VISUAL_trueCOLOR;
 913         info->fix.mmio_start = 0;
 914         info->fix.mmio_len = 0;
 915         info->fix.type_aux = 0;
 916         info->fix.xpanstep = 1; /* doing it in hw */
 917         info->fix.ypanstep = 1; /* doing it in hw */
 918         info->fix.ywrapstep = 0;
 919         info->fix.accel = FB_ACCEL_NONE;
 920         info->fix.type_aux = 0;
 921
 922         info->fix.line_length = pitch;
 923         return;
 924 }
 925
 926 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 927                             uint32_t fb_width, uint32_t fb_height)
 928 {
 929         struct drm_framebuffer *fb = fb_helper->fb;
 930         info->pseudo_palette = fb_helper->pseudo_palette;
 931         info->var.xres_virtual = fb->width;
 932         info->var.yres_virtual = fb->height;
 933         info->var.bits_per_pixel = fb->bits_per_pixel;
 934         info->var.accel_flags = FB_ACCELF_TEXT;
 935         info->var.xoffset = 0;
 936         info->var.yoffset = 0;
 937         info->var.activate = FB_ACTIVATE_NOW;
 938         info->var.height = -1;
 939         info->var.width = -1;
 940
 941         switch (fb->depth) {
 942         case 8:
 943                 info->var.red.offset = 0;
 944                 info->var.green.offset = 0;
 945                 info->var.blue.offset = 0;
 946                 info->var.red.length = 8; /* 8bit DAC */
 947                 info->var.green.length = 8;
 948                 info->var.blue.length = 8;
 949                 info->var.transp.offset = 0;
 950                 info->var.transp.length = 0;
 951                 break;
 952         case 15:
 953                 info->var.red.offset = 10;
 954                 info->var.green.offset = 5;
 955                 info->var.blue.offset = 0;
 956                 info->var.red.length = 5;
 957                 info->var.green.length = 5;
 958                 info->var.blue.length = 5;
 959                 info->var.transp.offset = 15;
 960                 info->var.transp.length = 1;
 961                 break;
 962         case 16:
 963                 info->var.red.offset = 11;
 964                 info->var.green.offset = 5;
 965                 info->var.blue.offset = 0;
 966                 info->var.red.length = 5;
 967                 info->var.green.length = 6;
 968                 info->var.blue.length = 5;
 969                 info->var.transp.offset = 0;
 970                 break;
 971         case 24:
 972                 info->var.red.offset = 16;
 973                 info->var.green.offset = 8;
 974                 info->var.blue.offset = 0;
 975                 info->var.red.length = 8;
 976                 info->var.green.length = 8;
 977                 info->var.blue.length = 8;
 978                 info->var.transp.offset = 0;
 979                 info->var.transp.length = 0;
 980                 break;
 981         case 32:
 982                 info->var.red.offset = 16;
 983                 info->var.green.offset = 8;
 984                 info->var.blue.offset = 0;
 985                 info->var.red.length = 8;
 986                 info->var.green.length = 8;
 987                 info->var.blue.length = 8;
 988                 info->var.transp.offset = 24;
 989                 info->var.transp.length = 8;
 990                 break;
 991         default:
 992                 break;
 993         }
 994
 995         info->var.xres = fb_width;
 996         info->var.yres = fb_height;
 997 }
 998 #endif
 999
1000 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1001                                                uint32_t maxX,
1002                                                uint32_t maxY)
1003 {
1004         struct drm_connector *connector;
1005         int count = 0;
1006         int i;
1007
1008         for (i = 0; i < fb_helper->connector_count; i++) {
1009                 connector = fb_helper->connector_info[i]->connector;
1010                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1011         }
1012
1013         return count;
1014 }
1015
1016 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1017 {
1018         struct drm_display_mode *mode;
1019
1020         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1021                 if (drm_mode_width(mode) > width ||
1022                     drm_mode_height(mode) > height)
1023                         continue;
1024                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1025                         return mode;
1026         }
1027         return NULL;
1028 }
1029
1030 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1031 {
1032         struct drm_cmdline_mode *cmdline_mode;
1033         cmdline_mode = &fb_connector->cmdline_mode;
1034         return cmdline_mode->specified;
1035 }
1036
1037 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1038                                                       int width, int height)
1039 {
1040         struct drm_cmdline_mode *cmdline_mode;
1041         struct drm_display_mode *mode = NULL;
1042
1043         cmdline_mode = &fb_helper_conn->cmdline_mode;
1044         if (cmdline_mode->specified == false &&
1045             !drm_fetch_cmdline_mode_from_kenv(fb_helper_conn->connector,
1046             cmdline_mode))
1047                         return (NULL);
1048
1049         /* attempt to find a matching mode in the list of modes
1050          *  we have gotten so far, if not add a CVT mode that conforms
1051          */
1052         if (cmdline_mode->rb || cmdline_mode->margins)
1053                 goto create_mode;
1054
1055         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1056                 /* check width/height */
1057                 if (mode->hdisplay != cmdline_mode->xres ||
1058                     mode->vdisplay != cmdline_mode->yres)
1059                         continue;
1060
1061                 if (cmdline_mode->refresh_specified) {
1062                         if (mode->vrefresh != cmdline_mode->refresh)
1063                                 continue;
1064                 }
1065
1066                 if (cmdline_mode->interlace) {
1067                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1068                                 continue;
1069                 }
1070                 return mode;
1071         }
1072
1073 create_mode:
1074         if (cmdline_mode->cvt)
1075                 mode = drm_cvt_mode(fb_helper_conn->connector->dev,
1076                                     cmdline_mode->xres, cmdline_mode->yres,
1077                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1078                                     cmdline_mode->rb, cmdline_mode->interlace,
1079                                     cmdline_mode->margins);
1080         else
1081                 mode = drm_gtf_mode(fb_helper_conn->connector->dev,
1082                                     cmdline_mode->xres, cmdline_mode->yres,
1083                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1084                                     cmdline_mode->interlace,
1085                                     cmdline_mode->margins);
1086         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1087         list_add(&mode->head, &fb_helper_conn->connector->modes);
1088         return mode;
1089 }
1090
1091 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1092 {
1093         bool enable;
1094
1095         if (strict) {
1096                 enable = connector->status == connector_status_connected;
1097         } else {
1098                 enable = connector->status != connector_status_disconnected;
1099         }
1100         return enable;
1101 }
1102
1103 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1104                                   bool *enabled)
1105 {
1106         bool any_enabled = false;
1107         struct drm_connector *connector;
1108         int i = 0;
1109
1110         for (i = 0; i < fb_helper->connector_count; i++) {
1111                 connector = fb_helper->connector_info[i]->connector;
1112                 enabled[i] = drm_connector_enabled(connector, true);
1113                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1114                           enabled[i] ? "yes" : "no");
1115                 any_enabled |= enabled[i];
1116         }
1117
1118         if (any_enabled)
1119                 return;
1120
1121         for (i = 0; i < fb_helper->connector_count; i++) {
1122                 connector = fb_helper->connector_info[i]->connector;
1123                 enabled[i] = drm_connector_enabled(connector, false);
1124         }
1125 }
1126
1127 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1128                               struct drm_display_mode **modes,
1129                               bool *enabled, int width, int height)
1130 {
1131         int count, i, j;
1132         bool can_clone = false;
1133         struct drm_fb_helper_connector *fb_helper_conn;
1134         struct drm_display_mode *dmt_mode, *mode;
1135
1136         /* only contemplate cloning in the single crtc case */
1137         if (fb_helper->crtc_count > 1)
1138                 return false;
1139
1140         count = 0;
1141         for (i = 0; i < fb_helper->connector_count; i++) {
1142                 if (enabled[i])
1143                         count++;
1144         }
1145
1146         /* only contemplate cloning if more than one connector is enabled */
1147         if (count <= 1)
1148                 return false;
1149
1150         /* check the command line or if nothing common pick 1024x768 */
1151         can_clone = true;
1152         for (i = 0; i < fb_helper->connector_count; i++) {
1153                 if (!enabled[i])
1154                         continue;
1155                 fb_helper_conn = fb_helper->connector_info[i];
1156                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1157                 if (!modes[i]) {
1158                         can_clone = false;
1159                         break;
1160                 }
1161                 for (j = 0; j < i; j++) {
1162                         if (!enabled[j])
1163                                 continue;
1164                         if (!drm_mode_equal(modes[j], modes[i]))
1165                                 can_clone = false;
1166                 }
1167         }
1168
1169         if (can_clone) {
1170                 DRM_DEBUG_KMS("can clone using command line\n");
1171                 return true;
1172         }
1173
1174         /* try and find a 1024x768 mode on each connector */
1175         can_clone = true;
1176         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1177
1178         for (i = 0; i < fb_helper->connector_count; i++) {
1179
1180                 if (!enabled[i])
1181                         continue;
1182
1183                 fb_helper_conn = fb_helper->connector_info[i];
1184                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1185                         if (drm_mode_equal(mode, dmt_mode))
1186                                 modes[i] = mode;
1187                 }
1188                 if (!modes[i])
1189                         can_clone = false;
1190         }
1191
1192         if (can_clone) {
1193                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1194                 return true;
1195         }
1196         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1197         return false;
1198 }
1199
1200 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1201                                  struct drm_display_mode **modes,
1202                                  bool *enabled, int width, int height)
1203 {
1204         struct drm_fb_helper_connector *fb_helper_conn;
1205         int i;
1206
1207         for (i = 0; i < fb_helper->connector_count; i++) {
1208                 fb_helper_conn = fb_helper->connector_info[i];
1209
1210                 if (enabled[i] == false)
1211                         continue;
1212
1213                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1214                               fb_helper_conn->connector->base.id);
1215
1216                 /* got for command line mode first */
1217                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1218                 if (!modes[i]) {
1219                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1220                                       fb_helper_conn->connector->base.id);
1221                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1222                 }
1223                 /* No preferred modes, pick one off the list */
1224                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1225                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1226                                 break;
1227                 }
1228                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1229                           "none");
1230         }
1231         return true;
1232 }
1233
1234 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1235                           struct drm_fb_helper_crtc **best_crtcs,
1236                           struct drm_display_mode **modes,
1237                           int n, int width, int height)
1238 {
1239         int c, o;
1240         struct drm_device *dev = fb_helper->dev;
1241         struct drm_connector *connector;
1242         struct drm_connector_helper_funcs *connector_funcs;
1243         struct drm_encoder *encoder;
1244         struct drm_fb_helper_crtc *best_crtc;
1245         int my_score, best_score, score;
1246         struct drm_fb_helper_crtc **crtcs, *crtc;
1247         struct drm_fb_helper_connector *fb_helper_conn;
1248
1249         if (n == fb_helper->connector_count)
1250                 return 0;
1251
1252         fb_helper_conn = fb_helper->connector_info[n];
1253         connector = fb_helper_conn->connector;
1254
1255         best_crtcs[n] = NULL;
1256         best_crtc = NULL;
1257         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1258         if (modes[n] == NULL)
1259                 return best_score;
1260
1261         crtcs = kmalloc(dev->mode_config.num_connector *
1262             sizeof(struct drm_fb_helper_crtc *), M_DRM,
1263             M_WAITOK | M_ZERO);
1264
1265         my_score = 1;
1266         if (connector->status == connector_status_connected)
1267                 my_score++;
1268         if (drm_has_cmdline_mode(fb_helper_conn))
1269                 my_score++;
1270         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1271                 my_score++;
1272
1273         connector_funcs = connector->helper_private;
1274         encoder = connector_funcs->best_encoder(connector);
1275         if (!encoder)
1276                 goto out;
1277
1278         /* select a crtc for this connector and then attempt to configure
1279            remaining connectors */
1280         for (c = 0; c < fb_helper->crtc_count; c++) {
1281                 crtc = &fb_helper->crtc_info[c];
1282
1283                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1284                         continue;
1285                 }
1286
1287                 for (o = 0; o < n; o++)
1288                         if (best_crtcs[o] == crtc)
1289                                 break;
1290
1291                 if (o < n) {
1292                         /* ignore cloning unless only a single crtc */
1293                         if (fb_helper->crtc_count > 1)
1294                                 continue;
1295
1296                         if (!drm_mode_equal(modes[o], modes[n]))
1297                                 continue;
1298                 }
1299
1300                 crtcs[n] = crtc;
1301                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1302                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1303                                                   width, height);
1304                 if (score > best_score) {
1305                         best_crtc = crtc;
1306                         best_score = score;
1307                         memcpy(best_crtcs, crtcs,
1308                                dev->mode_config.num_connector *
1309                                sizeof(struct drm_fb_helper_crtc *));
1310                 }
1311         }
1312 out:
1313         drm_free(crtcs, M_DRM);
1314         return best_score;
1315 }
1316
1317 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1318 {
1319         struct drm_device *dev = fb_helper->dev;
1320         struct drm_fb_helper_crtc **crtcs;
1321         struct drm_display_mode **modes;
1322         struct drm_encoder *encoder;
1323         struct drm_mode_set *modeset;
1324         bool *enabled;
1325         int width, height;
1326         int i, ret;
1327
1328         DRM_DEBUG_KMS("\n");
1329
1330         width = dev->mode_config.max_width;
1331         height = dev->mode_config.max_height;
1332
1333         /* clean out all the encoder/crtc combos */
1334         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1335                 encoder->crtc = NULL;
1336         }
1337
1338         crtcs = kmalloc(dev->mode_config.num_connector *
1339             sizeof(struct drm_fb_helper_crtc *), M_DRM,
1340             M_WAITOK | M_ZERO);
1341         modes = kmalloc(dev->mode_config.num_connector *
1342             sizeof(struct drm_display_mode *), M_DRM,
1343             M_WAITOK | M_ZERO);
1344         enabled = kmalloc(dev->mode_config.num_connector *
1345             sizeof(bool), M_DRM, M_WAITOK | M_ZERO);
1346
1347         drm_enable_connectors(fb_helper, enabled);
1348
1349         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1350         if (!ret) {
1351                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1352                 if (!ret)
1353                         DRM_ERROR("Unable to find initial modes\n");
1354         }
1355
1356         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1357
1358         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1359
1360         /* need to set the modesets up here for use later */
1361         /* fill out the connector<->crtc mappings into the modesets */
1362         for (i = 0; i < fb_helper->crtc_count; i++) {
1363                 modeset = &fb_helper->crtc_info[i].mode_set;
1364                 modeset->num_connectors = 0;
1365         }
1366
1367         for (i = 0; i < fb_helper->connector_count; i++) {
1368                 struct drm_display_mode *mode = modes[i];
1369                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1370                 modeset = &fb_crtc->mode_set;
1371
1372                 if (mode && fb_crtc) {
1373                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1374                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1375                         fb_crtc->desired_mode = mode;
1376                         if (modeset->mode)
1377                                 drm_mode_destroy(dev, modeset->mode);
1378                         modeset->mode = drm_mode_duplicate(dev,
1379                                                            fb_crtc->desired_mode);
1380                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1381                 }
1382         }
1383
1384         drm_free(crtcs, M_DRM);
1385         drm_free(modes, M_DRM);
1386         drm_free(enabled, M_DRM);
1387 }
1388
1389 /**
1390  * drm_helper_initial_config - setup a sane initial connector configuration
1391  * @dev: DRM device
1392  *
1393  * LOCKING:
1394  * Called at init time, must take mode config lock.
1395  *
1396  * Scan the CRTCs and connectors and try to put together an initial setup.
1397  * At the moment, this is a cloned configuration across all heads with
1398  * a new framebuffer object as the backing store.
1399  *
1400  * RETURNS:
1401  * Zero if everything went ok, nonzero otherwise.
1402  */
1403 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1404 {
1405         struct drm_device *dev = fb_helper->dev;
1406         int count = 0;
1407
1408         /* disable all the possible outputs/crtcs before entering KMS mode */
1409         drm_helper_disable_unused_functions(fb_helper->dev);
1410
1411         drm_fb_helper_parse_command_line(fb_helper);
1412
1413         count = drm_fb_helper_probe_connector_modes(fb_helper,
1414                                                     dev->mode_config.max_width,
1415                                                     dev->mode_config.max_height);
1416         /*
1417          * we shouldn't end up with no modes here.
1418          */
1419         if (count == 0) {
1420                 kprintf("No connectors reported connected with modes\n");
1421         }
1422         drm_setup_crtcs(fb_helper);
1423
1424         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1425 }
1426
1427 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1428 {
1429         struct drm_device *dev = fb_helper->dev;
1430         int count = 0;
1431         u32 max_width, max_height, bpp_sel;
1432         bool bound = false, crtcs_bound = false;
1433         struct drm_crtc *crtc;
1434
1435         if (!fb_helper->fb)
1436                 return 0;
1437
1438         lockmgr(&dev->mode_config.mutex, LK_EXCLUSIVE);
1439         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1440                 if (crtc->fb)
1441                         crtcs_bound = true;
1442                 if (crtc->fb == fb_helper->fb)
1443                         bound = true;
1444         }
1445
1446         if (!bound && crtcs_bound) {
1447                 fb_helper->delayed_hotplug = true;
1448                 lockmgr(&dev->mode_config.mutex, LK_RELEASE);
1449                 return 0;
1450         }
1451         DRM_DEBUG_KMS("\n");
1452
1453         max_width = fb_helper->fb->width;
1454         max_height = fb_helper->fb->height;
1455         bpp_sel = fb_helper->fb->bits_per_pixel;
1456
1457         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1458                                                     max_height);
1459         drm_setup_crtcs(fb_helper);
1460         lockmgr(&dev->mode_config.mutex, LK_RELEASE);
1461
1462         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1463 }
1464