drivers/gpu/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #include <linux/kernel.h>
  31 #include <linux/sysrq.h>
  32 #include <linux/slab.h>
  33 #include <linux/fb.h>
  34 #include "drmP.h"
  35 #include "drm_crtc.h"
  36 #include "drm_fb_helper.h"
  37 #include "drm_crtc_helper.h"
  38
  39 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  40 MODULE_DESCRIPTION("DRM KMS helper");
  41 MODULE_LICENSE("GPL and additional rights");
  42
  43 static LIST_HEAD(kernel_fb_helper_list);
  44
  45 /* simple single crtc case helper function */
  46 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  47 {
  48         struct drm_device *dev = fb_helper->dev;
  49         struct drm_connector *connector;
  50         int i;
  51
  52         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  53                 struct drm_fb_helper_connector *fb_helper_connector;
  54
  55                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  56                 if (!fb_helper_connector)
  57                         goto fail;
  58
  59                 fb_helper_connector->connector = connector;
  60                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  61         }
  62         return 0;
  63 fail:
  64         for (i = 0; i < fb_helper->connector_count; i++) {
  65                 kfree(fb_helper->connector_info[i]);
  66                 fb_helper->connector_info[i] = NULL;
  67         }
  68         fb_helper->connector_count = 0;
  69         return -ENOMEM;
  70 }
  71 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
  72
  73 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
  74 {
  75         struct drm_fb_helper_connector *fb_helper_conn;
  76         int i;
  77
  78         for (i = 0; i < fb_helper->connector_count; i++) {
  79                 struct drm_cmdline_mode *mode;
  80                 struct drm_connector *connector;
  81                 char *option = NULL;
  82
  83                 fb_helper_conn = fb_helper->connector_info[i];
  84                 connector = fb_helper_conn->connector;
  85                 mode = &fb_helper_conn->cmdline_mode;
  86
  87                 /* do something on return - turn off connector maybe */
  88                 if (fb_get_options(drm_get_connector_name(connector), &option))
  89                         continue;
  90
  91                 if (drm_mode_parse_command_line_for_connector(option,
  92                                                               connector,
  93                                                               mode)) {
  94                         if (mode->force) {
  95                                 const char *s;
  96                                 switch (mode->force) {
  97                                 case DRM_FORCE_OFF: s = "OFF"; break;
  98                                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
  99                                 default:
 100                                 case DRM_FORCE_ON: s = "ON"; break;
 101                                 }
 102
 103                                 DRM_INFO("forcing %s connector %s\n",
 104                                          drm_get_connector_name(connector), s);
 105                                 connector->force = mode->force;
 106                         }
 107
 108                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 109                                       drm_get_connector_name(connector),
 110                                       mode->xres, mode->yres,
 111                                       mode->refresh_specified ? mode->refresh : 60,
 112                                       mode->rb ? " reduced blanking" : "",
 113                                       mode->margins ? " with margins" : "",
 114                                       mode->interlace ?  " interlaced" : "");
 115                 }
 116
 117         }
 118         return 0;
 119 }
 120
 121 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 122 {
 123         uint16_t *r_base, *g_base, *b_base;
 124         int i;
 125
 126         r_base = crtc->gamma_store;
 127         g_base = r_base + crtc->gamma_size;
 128         b_base = g_base + crtc->gamma_size;
 129
 130         for (i = 0; i < crtc->gamma_size; i++)
 131                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 132 }
 133
 134 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 135 {
 136         uint16_t *r_base, *g_base, *b_base;
 137
 138         r_base = crtc->gamma_store;
 139         g_base = r_base + crtc->gamma_size;
 140         b_base = g_base + crtc->gamma_size;
 141
 142         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 143 }
 144
 145 int drm_fb_helper_debug_enter(struct fb_info *info)
 146 {
 147         struct drm_fb_helper *helper = info->par;
 148         struct drm_crtc_helper_funcs *funcs;
 149         int i;
 150
 151         if (list_empty(&kernel_fb_helper_list))
 152                 return false;
 153
 154         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 155                 for (i = 0; i < helper->crtc_count; i++) {
 156                         struct drm_mode_set *mode_set =
 157                                 &helper->crtc_info[i].mode_set;
 158
 159                         if (!mode_set->crtc->enabled)
 160                                 continue;
 161
 162                         funcs = mode_set->crtc->helper_private;
 163                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 164                         funcs->mode_set_base_atomic(mode_set->crtc,
 165                                                     mode_set->fb,
 166                                                     mode_set->x,
 167                                                     mode_set->y,
 168                                                     ENTER_ATOMIC_MODE_SET);
 169                 }
 170         }
 171
 172         return 0;
 173 }
 174 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 175
 176 /* Find the real fb for a given fb helper CRTC */
 177 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 178 {
 179         struct drm_device *dev = crtc->dev;
 180         struct drm_crtc *c;
 181
 182         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 183                 if (crtc->base.id == c->base.id)
 184                         return c->fb;
 185         }
 186
 187         return NULL;
 188 }
 189
 190 int drm_fb_helper_debug_leave(struct fb_info *info)
 191 {
 192         struct drm_fb_helper *helper = info->par;
 193         struct drm_crtc *crtc;
 194         struct drm_crtc_helper_funcs *funcs;
 195         struct drm_framebuffer *fb;
 196         int i;
 197
 198         for (i = 0; i < helper->crtc_count; i++) {
 199                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 200                 crtc = mode_set->crtc;
 201                 funcs = crtc->helper_private;
 202                 fb = drm_mode_config_fb(crtc);
 203
 204                 if (!crtc->enabled)
 205                         continue;
 206
 207                 if (!fb) {
 208                         DRM_ERROR("no fb to restore??\n");
 209                         continue;
 210                 }
 211
 212                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 213                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 214                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 215         }
 216
 217         return 0;
 218 }
 219 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 220
 221 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 222 {
 223         bool error = false;
 224         int i, ret;
 225         for (i = 0; i < fb_helper->crtc_count; i++) {
 226                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 227                 ret = drm_crtc_helper_set_config(mode_set);
 228                 if (ret)
 229                         error = true;
 230         }
 231         return error;
 232 }
 233 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 234
 235 bool drm_fb_helper_force_kernel_mode(void)
 236 {
 237         bool ret, error = false;
 238         struct drm_fb_helper *helper;
 239
 240         if (list_empty(&kernel_fb_helper_list))
 241                 return false;
 242
 243         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 244                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 245                         continue;
 246
 247                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 248                 if (ret)
 249                         error = true;
 250         }
 251         return error;
 252 }
 253
 254 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 255                         void *panic_str)
 256 {
 257         printk(KERN_ERR "panic occurred, switching back to text console\n");
 258         return drm_fb_helper_force_kernel_mode();
 259 }
 260 EXPORT_SYMBOL(drm_fb_helper_panic);
 261
 262 static struct notifier_block paniced = {
 263         .notifier_call = drm_fb_helper_panic,
 264 };
 265
 266 /**
 267  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 268  *
 269  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 270  */
 271 void drm_fb_helper_restore(void)
 272 {
 273         bool ret;
 274         ret = drm_fb_helper_force_kernel_mode();
 275         if (ret == true)
 276                 DRM_ERROR("Failed to restore crtc configuration\n");
 277 }
 278 EXPORT_SYMBOL(drm_fb_helper_restore);
 279
 280 #ifdef CONFIG_MAGIC_SYSRQ
 281 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 282 {
 283         drm_fb_helper_restore();
 284 }
 285 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 286
 287 static void drm_fb_helper_sysrq(int dummy1)
 288 {
 289         schedule_work(&drm_fb_helper_restore_work);
 290 }
 291
 292 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 293         .handler = drm_fb_helper_sysrq,
 294         .help_msg = "force-fb(V)",
 295         .action_msg = "Restore framebuffer console",
 296 };
 297 #else
 298 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 299 #endif
 300
 301 static void drm_fb_helper_on(struct fb_info *info)
 302 {
 303         struct drm_fb_helper *fb_helper = info->par;
 304         struct drm_device *dev = fb_helper->dev;
 305         struct drm_crtc *crtc;
 306         struct drm_crtc_helper_funcs *crtc_funcs;
 307         struct drm_connector *connector;
 308         struct drm_encoder *encoder;
 309         int i, j;
 310
 311         /*
 312          * For each CRTC in this fb, turn the crtc on then,
 313          * find all associated encoders and turn them on.
 314          */
 315         mutex_lock(&dev->mode_config.mutex);
 316         for (i = 0; i < fb_helper->crtc_count; i++) {
 317                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 318                 crtc_funcs = crtc->helper_private;
 319
 320                 if (!crtc->enabled)
 321                         continue;
 322
 323                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 324
 325                 /* Walk the connectors & encoders on this fb turning them on */
 326                 for (j = 0; j < fb_helper->connector_count; j++) {
 327                         connector = fb_helper->connector_info[j]->connector;
 328                         connector->dpms = DRM_MODE_DPMS_ON;
 329                         drm_connector_property_set_value(connector,
 330                                                          dev->mode_config.dpms_property,
 331                                                          DRM_MODE_DPMS_ON);
 332                 }
 333                 /* Found a CRTC on this fb, now find encoders */
 334                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 335                         if (encoder->crtc == crtc) {
 336                                 struct drm_encoder_helper_funcs *encoder_funcs;
 337
 338                                 encoder_funcs = encoder->helper_private;
 339                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 340                         }
 341                 }
 342         }
 343         mutex_unlock(&dev->mode_config.mutex);
 344 }
 345
 346 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 347 {
 348         struct drm_fb_helper *fb_helper = info->par;
 349         struct drm_device *dev = fb_helper->dev;
 350         struct drm_crtc *crtc;
 351         struct drm_crtc_helper_funcs *crtc_funcs;
 352         struct drm_connector *connector;
 353         struct drm_encoder *encoder;
 354         int i, j;
 355
 356         /*
 357          * For each CRTC in this fb, find all associated encoders
 358          * and turn them off, then turn off the CRTC.
 359          */
 360         mutex_lock(&dev->mode_config.mutex);
 361         for (i = 0; i < fb_helper->crtc_count; i++) {
 362                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 363                 crtc_funcs = crtc->helper_private;
 364
 365                 if (!crtc->enabled)
 366                         continue;
 367
 368                 /* Walk the connectors on this fb and mark them off */
 369                 for (j = 0; j < fb_helper->connector_count; j++) {
 370                         connector = fb_helper->connector_info[j]->connector;
 371                         connector->dpms = dpms_mode;
 372                         drm_connector_property_set_value(connector,
 373                                                          dev->mode_config.dpms_property,
 374                                                          dpms_mode);
 375                 }
 376                 /* Found a CRTC on this fb, now find encoders */
 377                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 378                         if (encoder->crtc == crtc) {
 379                                 struct drm_encoder_helper_funcs *encoder_funcs;
 380
 381                                 encoder_funcs = encoder->helper_private;
 382                                 encoder_funcs->dpms(encoder, dpms_mode);
 383                         }
 384                 }
 385                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 386         }
 387         mutex_unlock(&dev->mode_config.mutex);
 388 }
 389
 390 int drm_fb_helper_blank(int blank, struct fb_info *info)
 391 {
 392         switch (blank) {
 393         /* Display: On; HSync: On, VSync: On */
 394         case FB_BLANK_UNBLANK:
 395                 drm_fb_helper_on(info);
 396                 break;
 397         /* Display: Off; HSync: On, VSync: On */
 398         case FB_BLANK_NORMAL:
 399                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 400                 break;
 401         /* Display: Off; HSync: Off, VSync: On */
 402         case FB_BLANK_HSYNC_SUSPEND:
 403                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 404                 break;
 405         /* Display: Off; HSync: On, VSync: Off */
 406         case FB_BLANK_VSYNC_SUSPEND:
 407                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 408                 break;
 409         /* Display: Off; HSync: Off, VSync: Off */
 410         case FB_BLANK_POWERDOWN:
 411                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 412                 break;
 413         }
 414         return 0;
 415 }
 416 EXPORT_SYMBOL(drm_fb_helper_blank);
 417
 418 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 419 {
 420         int i;
 421
 422         for (i = 0; i < helper->connector_count; i++)
 423                 kfree(helper->connector_info[i]);
 424         kfree(helper->connector_info);
 425         for (i = 0; i < helper->crtc_count; i++)
 426                 kfree(helper->crtc_info[i].mode_set.connectors);
 427         kfree(helper->crtc_info);
 428 }
 429
 430 int drm_fb_helper_init(struct drm_device *dev,
 431                        struct drm_fb_helper *fb_helper,
 432                        int crtc_count, int max_conn_count)
 433 {
 434         struct drm_crtc *crtc;
 435         int ret = 0;
 436         int i;
 437
 438         fb_helper->dev = dev;
 439
 440         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 441
 442         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 443         if (!fb_helper->crtc_info)
 444                 return -ENOMEM;
 445
 446         fb_helper->crtc_count = crtc_count;
 447         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 448         if (!fb_helper->connector_info) {
 449                 kfree(fb_helper->crtc_info);
 450                 return -ENOMEM;
 451         }
 452         fb_helper->connector_count = 0;
 453
 454         for (i = 0; i < crtc_count; i++) {
 455                 fb_helper->crtc_info[i].mode_set.connectors =
 456                         kcalloc(max_conn_count,
 457                                 sizeof(struct drm_connector *),
 458                                 GFP_KERNEL);
 459
 460                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 461                         ret = -ENOMEM;
 462                         goto out_free;
 463                 }
 464                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 465         }
 466
 467         i = 0;
 468         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 469                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 470                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 471                 i++;
 472         }
 473         fb_helper->conn_limit = max_conn_count;
 474         return 0;
 475 out_free:
 476         drm_fb_helper_crtc_free(fb_helper);
 477         return -ENOMEM;
 478 }
 479 EXPORT_SYMBOL(drm_fb_helper_init);
 480
 481 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 482 {
 483         if (!list_empty(&fb_helper->kernel_fb_list)) {
 484                 list_del(&fb_helper->kernel_fb_list);
 485                 if (list_empty(&kernel_fb_helper_list)) {
 486                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 487                         atomic_notifier_chain_unregister(&panic_notifier_list,
 488                                                          &paniced);
 489                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 490                 }
 491         }
 492
 493         drm_fb_helper_crtc_free(fb_helper);
 494
 495 }
 496 EXPORT_SYMBOL(drm_fb_helper_fini);
 497
 498 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 499                      u16 blue, u16 regno, struct fb_info *info)
 500 {
 501         struct drm_fb_helper *fb_helper = info->par;
 502         struct drm_framebuffer *fb = fb_helper->fb;
 503         int pindex;
 504
 505         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 506                 u32 *palette;
 507                 u32 value;
 508                 /* place color in psuedopalette */
 509                 if (regno > 16)
 510                         return -EINVAL;
 511                 palette = (u32 *)info->pseudo_palette;
 512                 red >>= (16 - info->var.red.length);
 513                 green >>= (16 - info->var.green.length);
 514                 blue >>= (16 - info->var.blue.length);
 515                 value = (red << info->var.red.offset) |
 516                         (green << info->var.green.offset) |
 517                         (blue << info->var.blue.offset);
 518                 if (info->var.transp.length > 0) {
 519                         u32 mask = (1 << info->var.transp.length) - 1;
 520                         mask <<= info->var.transp.offset;
 521                         value |= mask;
 522                 }
 523                 palette[regno] = value;
 524                 return 0;
 525         }
 526
 527         pindex = regno;
 528
 529         if (fb->bits_per_pixel == 16) {
 530                 pindex = regno << 3;
 531
 532                 if (fb->depth == 16 && regno > 63)
 533                         return -EINVAL;
 534                 if (fb->depth == 15 && regno > 31)
 535                         return -EINVAL;
 536
 537                 if (fb->depth == 16) {
 538                         u16 r, g, b;
 539                         int i;
 540                         if (regno < 32) {
 541                                 for (i = 0; i < 8; i++)
 542                                         fb_helper->funcs->gamma_set(crtc, red,
 543                                                 green, blue, pindex + i);
 544                         }
 545
 546                         fb_helper->funcs->gamma_get(crtc, &r,
 547                                                     &g, &b,
 548                                                     pindex >> 1);
 549
 550                         for (i = 0; i < 4; i++)
 551                                 fb_helper->funcs->gamma_set(crtc, r,
 552                                                             green, b,
 553                                                             (pindex >> 1) + i);
 554                 }
 555         }
 556
 557         if (fb->depth != 16)
 558                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 559         return 0;
 560 }
 561
 562 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 563 {
 564         struct drm_fb_helper *fb_helper = info->par;
 565         struct drm_crtc_helper_funcs *crtc_funcs;
 566         u16 *red, *green, *blue, *transp;
 567         struct drm_crtc *crtc;
 568         int i, j, rc = 0;
 569         int start;
 570
 571         for (i = 0; i < fb_helper->crtc_count; i++) {
 572                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 573                 crtc_funcs = crtc->helper_private;
 574
 575                 red = cmap->red;
 576                 green = cmap->green;
 577                 blue = cmap->blue;
 578                 transp = cmap->transp;
 579                 start = cmap->start;
 580
 581                 for (j = 0; j < cmap->len; j++) {
 582                         u16 hred, hgreen, hblue, htransp = 0xffff;
 583
 584                         hred = *red++;
 585                         hgreen = *green++;
 586                         hblue = *blue++;
 587
 588                         if (transp)
 589                                 htransp = *transp++;
 590
 591                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 592                         if (rc)
 593                                 return rc;
 594                 }
 595                 crtc_funcs->load_lut(crtc);
 596         }
 597         return rc;
 598 }
 599 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 600
 601 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 602                             struct fb_info *info)
 603 {
 604         struct drm_fb_helper *fb_helper = info->par;
 605         struct drm_framebuffer *fb = fb_helper->fb;
 606         int depth;
 607
 608         if (var->pixclock != 0 || in_dbg_master())
 609                 return -EINVAL;
 610
 611         /* Need to resize the fb object !!! */
 612         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 613                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 614                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 615                           fb->width, fb->height, fb->bits_per_pixel);
 616                 return -EINVAL;
 617         }
 618
 619         switch (var->bits_per_pixel) {
 620         case 16:
 621                 depth = (var->green.length == 6) ? 16 : 15;
 622                 break;
 623         case 32:
 624                 depth = (var->transp.length > 0) ? 32 : 24;
 625                 break;
 626         default:
 627                 depth = var->bits_per_pixel;
 628                 break;
 629         }
 630
 631         switch (depth) {
 632         case 8:
 633                 var->red.offset = 0;
 634                 var->green.offset = 0;
 635                 var->blue.offset = 0;
 636                 var->red.length = 8;
 637                 var->green.length = 8;
 638                 var->blue.length = 8;
 639                 var->transp.length = 0;
 640                 var->transp.offset = 0;
 641                 break;
 642         case 15:
 643                 var->red.offset = 10;
 644                 var->green.offset = 5;
 645                 var->blue.offset = 0;
 646                 var->red.length = 5;
 647                 var->green.length = 5;
 648                 var->blue.length = 5;
 649                 var->transp.length = 1;
 650                 var->transp.offset = 15;
 651                 break;
 652         case 16:
 653                 var->red.offset = 11;
 654                 var->green.offset = 5;
 655                 var->blue.offset = 0;
 656                 var->red.length = 5;
 657                 var->green.length = 6;
 658                 var->blue.length = 5;
 659                 var->transp.length = 0;
 660                 var->transp.offset = 0;
 661                 break;
 662         case 24:
 663                 var->red.offset = 16;
 664                 var->green.offset = 8;
 665                 var->blue.offset = 0;
 666                 var->red.length = 8;
 667                 var->green.length = 8;
 668                 var->blue.length = 8;
 669                 var->transp.length = 0;
 670                 var->transp.offset = 0;
 671                 break;
 672         case 32:
 673                 var->red.offset = 16;
 674                 var->green.offset = 8;
 675                 var->blue.offset = 0;
 676                 var->red.length = 8;
 677                 var->green.length = 8;
 678                 var->blue.length = 8;
 679                 var->transp.length = 8;
 680                 var->transp.offset = 24;
 681                 break;
 682         default:
 683                 return -EINVAL;
 684         }
 685         return 0;
 686 }
 687 EXPORT_SYMBOL(drm_fb_helper_check_var);
 688
 689 /* this will let fbcon do the mode init */
 690 int drm_fb_helper_set_par(struct fb_info *info)
 691 {
 692         struct drm_fb_helper *fb_helper = info->par;
 693         struct drm_device *dev = fb_helper->dev;
 694         struct fb_var_screeninfo *var = &info->var;
 695         struct drm_crtc *crtc;
 696         int ret;
 697         int i;
 698
 699         if (var->pixclock != 0) {
 700                 DRM_ERROR("PIXEL CLOCK SET\n");
 701                 return -EINVAL;
 702         }
 703
 704         mutex_lock(&dev->mode_config.mutex);
 705         for (i = 0; i < fb_helper->crtc_count; i++) {
 706                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 707                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 708                 if (ret) {
 709                         mutex_unlock(&dev->mode_config.mutex);
 710                         return ret;
 711                 }
 712         }
 713         mutex_unlock(&dev->mode_config.mutex);
 714
 715         if (fb_helper->delayed_hotplug) {
 716                 fb_helper->delayed_hotplug = false;
 717                 drm_fb_helper_hotplug_event(fb_helper);
 718         }
 719         return 0;
 720 }
 721 EXPORT_SYMBOL(drm_fb_helper_set_par);
 722
 723 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 724                               struct fb_info *info)
 725 {
 726         struct drm_fb_helper *fb_helper = info->par;
 727         struct drm_device *dev = fb_helper->dev;
 728         struct drm_mode_set *modeset;
 729         struct drm_crtc *crtc;
 730         int ret = 0;
 731         int i;
 732
 733         mutex_lock(&dev->mode_config.mutex);
 734         for (i = 0; i < fb_helper->crtc_count; i++) {
 735                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 736
 737                 modeset = &fb_helper->crtc_info[i].mode_set;
 738
 739                 modeset->x = var->xoffset;
 740                 modeset->y = var->yoffset;
 741
 742                 if (modeset->num_connectors) {
 743                         ret = crtc->funcs->set_config(modeset);
 744                         if (!ret) {
 745                                 info->var.xoffset = var->xoffset;
 746                                 info->var.yoffset = var->yoffset;
 747                         }
 748                 }
 749         }
 750         mutex_unlock(&dev->mode_config.mutex);
 751         return ret;
 752 }
 753 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 754
 755 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 756                                   int preferred_bpp)
 757 {
 758         int new_fb = 0;
 759         int crtc_count = 0;
 760         int i;
 761         struct fb_info *info;
 762         struct drm_fb_helper_surface_size sizes;
 763         int gamma_size = 0;
 764
 765         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 766         sizes.surface_depth = 24;
 767         sizes.surface_bpp = 32;
 768         sizes.fb_width = (unsigned)-1;
 769         sizes.fb_height = (unsigned)-1;
 770
 771         /* if driver picks 8 or 16 by default use that
 772            for both depth/bpp */
 773         if (preferred_bpp != sizes.surface_bpp) {
 774                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 775         }
 776         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 777         for (i = 0; i < fb_helper->connector_count; i++) {
 778                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 779                 struct drm_cmdline_mode *cmdline_mode;
 780
 781                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 782
 783                 if (cmdline_mode->bpp_specified) {
 784                         switch (cmdline_mode->bpp) {
 785                         case 8:
 786                                 sizes.surface_depth = sizes.surface_bpp = 8;
 787                                 break;
 788                         case 15:
 789                                 sizes.surface_depth = 15;
 790                                 sizes.surface_bpp = 16;
 791                                 break;
 792                         case 16:
 793                                 sizes.surface_depth = sizes.surface_bpp = 16;
 794                                 break;
 795                         case 24:
 796                                 sizes.surface_depth = sizes.surface_bpp = 24;
 797                                 break;
 798                         case 32:
 799                                 sizes.surface_depth = 24;
 800                                 sizes.surface_bpp = 32;
 801                                 break;
 802                         }
 803                         break;
 804                 }
 805         }
 806
 807         crtc_count = 0;
 808         for (i = 0; i < fb_helper->crtc_count; i++) {
 809                 struct drm_display_mode *desired_mode;
 810                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 811
 812                 if (desired_mode) {
 813                         if (gamma_size == 0)
 814                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 815                         if (desired_mode->hdisplay < sizes.fb_width)
 816                                 sizes.fb_width = desired_mode->hdisplay;
 817                         if (desired_mode->vdisplay < sizes.fb_height)
 818                                 sizes.fb_height = desired_mode->vdisplay;
 819                         if (desired_mode->hdisplay > sizes.surface_width)
 820                                 sizes.surface_width = desired_mode->hdisplay;
 821                         if (desired_mode->vdisplay > sizes.surface_height)
 822                                 sizes.surface_height = desired_mode->vdisplay;
 823                         crtc_count++;
 824                 }
 825         }
 826
 827         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 828                 /* hmm everyone went away - assume VGA cable just fell out
 829                    and will come back later. */
 830                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 831                 sizes.fb_width = sizes.surface_width = 1024;
 832                 sizes.fb_height = sizes.surface_height = 768;
 833         }
 834
 835         /* push down into drivers */
 836         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 837         if (new_fb < 0)
 838                 return new_fb;
 839
 840         info = fb_helper->fbdev;
 841
 842         /* set the fb pointer */
 843         for (i = 0; i < fb_helper->crtc_count; i++) {
 844                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 845         }
 846
 847         if (new_fb) {
 848                 info->var.pixclock = 0;
 849                 if (register_framebuffer(info) < 0) {
 850                         return -EINVAL;
 851                 }
 852
 853                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 854                        info->fix.id);
 855
 856         } else {
 857                 drm_fb_helper_set_par(info);
 858         }
 859
 860         /* Switch back to kernel console on panic */
 861         /* multi card linked list maybe */
 862         if (list_empty(&kernel_fb_helper_list)) {
 863                 printk(KERN_INFO "drm: registered panic notifier\n");
 864                 atomic_notifier_chain_register(&panic_notifier_list,
 865                                                &paniced);
 866                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 867         }
 868         if (new_fb)
 869                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 870
 871         return 0;
 872 }
 873 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 874
 875 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 876                             uint32_t depth)
 877 {
 878         info->fix.type = FB_TYPE_PACKED_PIXELS;
 879         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 880                 FB_VISUAL_TRUECOLOR;
 881         info->fix.mmio_start = 0;
 882         info->fix.mmio_len = 0;
 883         info->fix.type_aux = 0;
 884         info->fix.xpanstep = 1; /* doing it in hw */
 885         info->fix.ypanstep = 1; /* doing it in hw */
 886         info->fix.ywrapstep = 0;
 887         info->fix.accel = FB_ACCEL_NONE;
 888         info->fix.type_aux = 0;
 889
 890         info->fix.line_length = pitch;
 891         return;
 892 }
 893 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 894
 895 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 896                             uint32_t fb_width, uint32_t fb_height)
 897 {
 898         struct drm_framebuffer *fb = fb_helper->fb;
 899         info->pseudo_palette = fb_helper->pseudo_palette;
 900         info->var.xres_virtual = fb->width;
 901         info->var.yres_virtual = fb->height;
 902         info->var.bits_per_pixel = fb->bits_per_pixel;
 903         info->var.accel_flags = FB_ACCELF_TEXT;
 904         info->var.xoffset = 0;
 905         info->var.yoffset = 0;
 906         info->var.activate = FB_ACTIVATE_NOW;
 907         info->var.height = -1;
 908         info->var.width = -1;
 909
 910         switch (fb->depth) {
 911         case 8:
 912                 info->var.red.offset = 0;
 913                 info->var.green.offset = 0;
 914                 info->var.blue.offset = 0;
 915                 info->var.red.length = 8; /* 8bit DAC */
 916                 info->var.green.length = 8;
 917                 info->var.blue.length = 8;
 918                 info->var.transp.offset = 0;
 919                 info->var.transp.length = 0;
 920                 break;
 921         case 15:
 922                 info->var.red.offset = 10;
 923                 info->var.green.offset = 5;
 924                 info->var.blue.offset = 0;
 925                 info->var.red.length = 5;
 926                 info->var.green.length = 5;
 927                 info->var.blue.length = 5;
 928                 info->var.transp.offset = 15;
 929                 info->var.transp.length = 1;
 930                 break;
 931         case 16:
 932                 info->var.red.offset = 11;
 933                 info->var.green.offset = 5;
 934                 info->var.blue.offset = 0;
 935                 info->var.red.length = 5;
 936                 info->var.green.length = 6;
 937                 info->var.blue.length = 5;
 938                 info->var.transp.offset = 0;
 939                 break;
 940         case 24:
 941                 info->var.red.offset = 16;
 942                 info->var.green.offset = 8;
 943                 info->var.blue.offset = 0;
 944                 info->var.red.length = 8;
 945                 info->var.green.length = 8;
 946                 info->var.blue.length = 8;
 947                 info->var.transp.offset = 0;
 948                 info->var.transp.length = 0;
 949                 break;
 950         case 32:
 951                 info->var.red.offset = 16;
 952                 info->var.green.offset = 8;
 953                 info->var.blue.offset = 0;
 954                 info->var.red.length = 8;
 955                 info->var.green.length = 8;
 956                 info->var.blue.length = 8;
 957                 info->var.transp.offset = 24;
 958                 info->var.transp.length = 8;
 959                 break;
 960         default:
 961                 break;
 962         }
 963
 964         info->var.xres = fb_width;
 965         info->var.yres = fb_height;
 966 }
 967 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 968
 969 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 970                                                uint32_t maxX,
 971                                                uint32_t maxY)
 972 {
 973         struct drm_connector *connector;
 974         int count = 0;
 975         int i;
 976
 977         for (i = 0; i < fb_helper->connector_count; i++) {
 978                 connector = fb_helper->connector_info[i]->connector;
 979                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 980         }
 981
 982         return count;
 983 }
 984
 985 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
 986 {
 987         struct drm_display_mode *mode;
 988
 989         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
 990                 if (drm_mode_width(mode) > width ||
 991                     drm_mode_height(mode) > height)
 992                         continue;
 993                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 994                         return mode;
 995         }
 996         return NULL;
 997 }
 998
 999 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1000 {
1001         struct drm_cmdline_mode *cmdline_mode;
1002         cmdline_mode = &fb_connector->cmdline_mode;
1003         return cmdline_mode->specified;
1004 }
1005
1006 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1007                                                       int width, int height)
1008 {
1009         struct drm_cmdline_mode *cmdline_mode;
1010         struct drm_display_mode *mode = NULL;
1011
1012         cmdline_mode = &fb_helper_conn->cmdline_mode;
1013         if (cmdline_mode->specified == false)
1014                 return mode;
1015
1016         /* attempt to find a matching mode in the list of modes
1017          *  we have gotten so far, if not add a CVT mode that conforms
1018          */
1019         if (cmdline_mode->rb || cmdline_mode->margins)
1020                 goto create_mode;
1021
1022         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1023                 /* check width/height */
1024                 if (mode->hdisplay != cmdline_mode->xres ||
1025                     mode->vdisplay != cmdline_mode->yres)
1026                         continue;
1027
1028                 if (cmdline_mode->refresh_specified) {
1029                         if (mode->vrefresh != cmdline_mode->refresh)
1030                                 continue;
1031                 }
1032
1033                 if (cmdline_mode->interlace) {
1034                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1035                                 continue;
1036                 }
1037                 return mode;
1038         }
1039
1040 create_mode:
1041         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1042                                                  cmdline_mode);
1043         list_add(&mode->head, &fb_helper_conn->connector->modes);
1044         return mode;
1045 }
1046
1047 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1048 {
1049         bool enable;
1050
1051         if (strict) {
1052                 enable = connector->status == connector_status_connected;
1053         } else {
1054                 enable = connector->status != connector_status_disconnected;
1055         }
1056         return enable;
1057 }
1058
1059 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1060                                   bool *enabled)
1061 {
1062         bool any_enabled = false;
1063         struct drm_connector *connector;
1064         int i = 0;
1065
1066         for (i = 0; i < fb_helper->connector_count; i++) {
1067                 connector = fb_helper->connector_info[i]->connector;
1068                 enabled[i] = drm_connector_enabled(connector, true);
1069                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1070                           enabled[i] ? "yes" : "no");
1071                 any_enabled |= enabled[i];
1072         }
1073
1074         if (any_enabled)
1075                 return;
1076
1077         for (i = 0; i < fb_helper->connector_count; i++) {
1078                 connector = fb_helper->connector_info[i]->connector;
1079                 enabled[i] = drm_connector_enabled(connector, false);
1080         }
1081 }
1082
1083 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1084                               struct drm_display_mode **modes,
1085                               bool *enabled, int width, int height)
1086 {
1087         int count, i, j;
1088         bool can_clone = false;
1089         struct drm_fb_helper_connector *fb_helper_conn;
1090         struct drm_display_mode *dmt_mode, *mode;
1091
1092         /* only contemplate cloning in the single crtc case */
1093         if (fb_helper->crtc_count > 1)
1094                 return false;
1095
1096         count = 0;
1097         for (i = 0; i < fb_helper->connector_count; i++) {
1098                 if (enabled[i])
1099                         count++;
1100         }
1101
1102         /* only contemplate cloning if more than one connector is enabled */
1103         if (count <= 1)
1104                 return false;
1105
1106         /* check the command line or if nothing common pick 1024x768 */
1107         can_clone = true;
1108         for (i = 0; i < fb_helper->connector_count; i++) {
1109                 if (!enabled[i])
1110                         continue;
1111                 fb_helper_conn = fb_helper->connector_info[i];
1112                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1113                 if (!modes[i]) {
1114                         can_clone = false;
1115                         break;
1116                 }
1117                 for (j = 0; j < i; j++) {
1118                         if (!enabled[j])
1119                                 continue;
1120                         if (!drm_mode_equal(modes[j], modes[i]))
1121                                 can_clone = false;
1122                 }
1123         }
1124
1125         if (can_clone) {
1126                 DRM_DEBUG_KMS("can clone using command line\n");
1127                 return true;
1128         }
1129
1130         /* try and find a 1024x768 mode on each connector */
1131         can_clone = true;
1132         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1133
1134         for (i = 0; i < fb_helper->connector_count; i++) {
1135
1136                 if (!enabled[i])
1137                         continue;
1138
1139                 fb_helper_conn = fb_helper->connector_info[i];
1140                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1141                         if (drm_mode_equal(mode, dmt_mode))
1142                                 modes[i] = mode;
1143                 }
1144                 if (!modes[i])
1145                         can_clone = false;
1146         }
1147
1148         if (can_clone) {
1149                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1150                 return true;
1151         }
1152         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1153         return false;
1154 }
1155
1156 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1157                                  struct drm_display_mode **modes,
1158                                  bool *enabled, int width, int height)
1159 {
1160         struct drm_fb_helper_connector *fb_helper_conn;
1161         int i;
1162
1163         for (i = 0; i < fb_helper->connector_count; i++) {
1164                 fb_helper_conn = fb_helper->connector_info[i];
1165
1166                 if (enabled[i] == false)
1167                         continue;
1168
1169                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1170                               fb_helper_conn->connector->base.id);
1171
1172                 /* got for command line mode first */
1173                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1174                 if (!modes[i]) {
1175                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1176                                       fb_helper_conn->connector->base.id);
1177                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1178                 }
1179                 /* No preferred modes, pick one off the list */
1180                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1181                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1182                                 break;
1183                 }
1184                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1185                           "none");
1186         }
1187         return true;
1188 }
1189
1190 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1191                           struct drm_fb_helper_crtc **best_crtcs,
1192                           struct drm_display_mode **modes,
1193                           int n, int width, int height)
1194 {
1195         int c, o;
1196         struct drm_device *dev = fb_helper->dev;
1197         struct drm_connector *connector;
1198         struct drm_connector_helper_funcs *connector_funcs;
1199         struct drm_encoder *encoder;
1200         struct drm_fb_helper_crtc *best_crtc;
1201         int my_score, best_score, score;
1202         struct drm_fb_helper_crtc **crtcs, *crtc;
1203         struct drm_fb_helper_connector *fb_helper_conn;
1204
1205         if (n == fb_helper->connector_count)
1206                 return 0;
1207
1208         fb_helper_conn = fb_helper->connector_info[n];
1209         connector = fb_helper_conn->connector;
1210
1211         best_crtcs[n] = NULL;
1212         best_crtc = NULL;
1213         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1214         if (modes[n] == NULL)
1215                 return best_score;
1216
1217         crtcs = kzalloc(dev->mode_config.num_connector *
1218                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1219         if (!crtcs)
1220                 return best_score;
1221
1222         my_score = 1;
1223         if (connector->status == connector_status_connected)
1224                 my_score++;
1225         if (drm_has_cmdline_mode(fb_helper_conn))
1226                 my_score++;
1227         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1228                 my_score++;
1229
1230         connector_funcs = connector->helper_private;
1231         encoder = connector_funcs->best_encoder(connector);
1232         if (!encoder)
1233                 goto out;
1234
1235         /* select a crtc for this connector and then attempt to configure
1236            remaining connectors */
1237         for (c = 0; c < fb_helper->crtc_count; c++) {
1238                 crtc = &fb_helper->crtc_info[c];
1239
1240                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1241                         continue;
1242                 }
1243
1244                 for (o = 0; o < n; o++)
1245                         if (best_crtcs[o] == crtc)
1246                                 break;
1247
1248                 if (o < n) {
1249                         /* ignore cloning unless only a single crtc */
1250                         if (fb_helper->crtc_count > 1)
1251                                 continue;
1252
1253                         if (!drm_mode_equal(modes[o], modes[n]))
1254                                 continue;
1255                 }
1256
1257                 crtcs[n] = crtc;
1258                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1259                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1260                                                   width, height);
1261                 if (score > best_score) {
1262                         best_crtc = crtc;
1263                         best_score = score;
1264                         memcpy(best_crtcs, crtcs,
1265                                dev->mode_config.num_connector *
1266                                sizeof(struct drm_fb_helper_crtc *));
1267                 }
1268         }
1269 out:
1270         kfree(crtcs);
1271         return best_score;
1272 }
1273
1274 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1275 {
1276         struct drm_device *dev = fb_helper->dev;
1277         struct drm_fb_helper_crtc **crtcs;
1278         struct drm_display_mode **modes;
1279         struct drm_encoder *encoder;
1280         struct drm_mode_set *modeset;
1281         bool *enabled;
1282         int width, height;
1283         int i, ret;
1284
1285         DRM_DEBUG_KMS("\n");
1286
1287         width = dev->mode_config.max_width;
1288         height = dev->mode_config.max_height;
1289
1290         /* clean out all the encoder/crtc combos */
1291         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1292                 encoder->crtc = NULL;
1293         }
1294
1295         crtcs = kcalloc(dev->mode_config.num_connector,
1296                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1297         modes = kcalloc(dev->mode_config.num_connector,
1298                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1299         enabled = kcalloc(dev->mode_config.num_connector,
1300                           sizeof(bool), GFP_KERNEL);
1301
1302         drm_enable_connectors(fb_helper, enabled);
1303
1304         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1305         if (!ret) {
1306                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1307                 if (!ret)
1308                         DRM_ERROR("Unable to find initial modes\n");
1309         }
1310
1311         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1312
1313         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1314
1315         /* need to set the modesets up here for use later */
1316         /* fill out the connector<->crtc mappings into the modesets */
1317         for (i = 0; i < fb_helper->crtc_count; i++) {
1318                 modeset = &fb_helper->crtc_info[i].mode_set;
1319                 modeset->num_connectors = 0;
1320         }
1321
1322         for (i = 0; i < fb_helper->connector_count; i++) {
1323                 struct drm_display_mode *mode = modes[i];
1324                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1325                 modeset = &fb_crtc->mode_set;
1326
1327                 if (mode && fb_crtc) {
1328                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1329                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1330                         fb_crtc->desired_mode = mode;
1331                         if (modeset->mode)
1332                                 drm_mode_destroy(dev, modeset->mode);
1333                         modeset->mode = drm_mode_duplicate(dev,
1334                                                            fb_crtc->desired_mode);
1335                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1336                 }
1337         }
1338
1339         kfree(crtcs);
1340         kfree(modes);
1341         kfree(enabled);
1342 }
1343
1344 /**
1345  * drm_helper_initial_config - setup a sane initial connector configuration
1346  * @dev: DRM device
1347  *
1348  * LOCKING:
1349  * Called at init time, must take mode config lock.
1350  *
1351  * Scan the CRTCs and connectors and try to put together an initial setup.
1352  * At the moment, this is a cloned configuration across all heads with
1353  * a new framebuffer object as the backing store.
1354  *
1355  * RETURNS:
1356  * Zero if everything went ok, nonzero otherwise.
1357  */
1358 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1359 {
1360         struct drm_device *dev = fb_helper->dev;
1361         int count = 0;
1362
1363         /* disable all the possible outputs/crtcs before entering KMS mode */
1364         drm_helper_disable_unused_functions(fb_helper->dev);
1365
1366         drm_fb_helper_parse_command_line(fb_helper);
1367
1368         count = drm_fb_helper_probe_connector_modes(fb_helper,
1369                                                     dev->mode_config.max_width,
1370                                                     dev->mode_config.max_height);
1371         /*
1372          * we shouldn't end up with no modes here.
1373          */
1374         if (count == 0) {
1375                 printk(KERN_INFO "No connectors reported connected with modes\n");
1376         }
1377         drm_setup_crtcs(fb_helper);
1378
1379         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1380 }
1381 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1382
1383 /**
1384  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1385  *                               probing all the outputs attached to the fb.
1386  * @fb_helper: the drm_fb_helper
1387  *
1388  * LOCKING:
1389  * Called at runtime, must take mode config lock.
1390  *
1391  * Scan the connectors attached to the fb_helper and try to put together a
1392  * setup after *notification of a change in output configuration.
1393  *
1394  * RETURNS:
1395  * 0 on success and a non-zero error code otherwise.
1396  */
1397 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1398 {
1399         struct drm_device *dev = fb_helper->dev;
1400         int count = 0;
1401         u32 max_width, max_height, bpp_sel;
1402         bool bound = false, crtcs_bound = false;
1403         struct drm_crtc *crtc;
1404
1405         if (!fb_helper->fb)
1406                 return 0;
1407
1408         mutex_lock(&dev->mode_config.mutex);
1409         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1410                 if (crtc->fb)
1411                         crtcs_bound = true;
1412                 if (crtc->fb == fb_helper->fb)
1413                         bound = true;
1414         }
1415
1416         if (!bound && crtcs_bound) {
1417                 fb_helper->delayed_hotplug = true;
1418                 mutex_unlock(&dev->mode_config.mutex);
1419                 return 0;
1420         }
1421         DRM_DEBUG_KMS("\n");
1422
1423         max_width = fb_helper->fb->width;
1424         max_height = fb_helper->fb->height;
1425         bpp_sel = fb_helper->fb->bits_per_pixel;
1426
1427         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1428                                                     max_height);
1429         drm_setup_crtcs(fb_helper);
1430         mutex_unlock(&dev->mode_config.mutex);
1431
1432         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1433 }
1434 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1435
1436 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1437  * but the module doesn't depend on any fb console symbols.  At least
1438  * attempt to load fbcon to avoid leaving the system without a usable console.
1439  */
1440 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1441 static int __init drm_fb_helper_modinit(void)
1442 {
1443         const char *name = "fbcon";
1444         struct module *fbcon;
1445
1446         mutex_lock(&module_mutex);
1447         fbcon = find_module(name);
1448         mutex_unlock(&module_mutex);
1449
1450         if (!fbcon)
1451                 request_module_nowait(name);
1452         return 0;
1453 }
1454
1455 module_init(drm_fb_helper_modinit);
1456 #endif