drivers/gpu/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #include <linux/kernel.h>
  31 #include <linux/sysrq.h>
  32 #include <linux/slab.h>
  33 #include <linux/fb.h>
  34 #include "drmP.h"
  35 #include "drm_crtc.h"
  36 #include "drm_fb_helper.h"
  37 #include "drm_crtc_helper.h"
  38
  39 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  40 MODULE_DESCRIPTION("DRM KMS helper");
  41 MODULE_LICENSE("GPL and additional rights");
  42
  43 static LIST_HEAD(kernel_fb_helper_list);
  44
  45 /* simple single crtc case helper function */
  46 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  47 {
  48         struct drm_device *dev = fb_helper->dev;
  49         struct drm_connector *connector;
  50         int i;
  51
  52         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  53                 struct drm_fb_helper_connector *fb_helper_connector;
  54
  55                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  56                 if (!fb_helper_connector)
  57                         goto fail;
  58
  59                 fb_helper_connector->connector = connector;
  60                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  61         }
  62         return 0;
  63 fail:
  64         for (i = 0; i < fb_helper->connector_count; i++) {
  65                 kfree(fb_helper->connector_info[i]);
  66                 fb_helper->connector_info[i] = NULL;
  67         }
  68         fb_helper->connector_count = 0;
  69         return -ENOMEM;
  70 }
  71 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
  72
  73 /**
  74  * drm_fb_helper_connector_parse_command_line - parse command line for connector
  75  * @connector - connector to parse line for
  76  * @mode_option - per connector mode option
  77  *
  78  * This parses the connector specific then generic command lines for
  79  * modes and options to configure the connector.
  80  *
  81  * This uses the same parameters as the fb modedb.c, except for extra
  82  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
  83  *
  84  * enable/enable Digital/disable bit at the end
  85  */
  86 static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_connector *fb_helper_conn,
  87                                                        const char *mode_option)
  88 {
  89         const char *name;
  90         unsigned int namelen;
  91         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
  92         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
  93         int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
  94         int i;
  95         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
  96         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  97         struct drm_connector *connector;
  98
  99         if (!fb_helper_conn)
 100                 return false;
 101         connector = fb_helper_conn->connector;
 102
 103         cmdline_mode = &fb_helper_conn->cmdline_mode;
 104         if (!mode_option)
 105                 mode_option = fb_mode_option;
 106
 107         if (!mode_option) {
 108                 cmdline_mode->specified = false;
 109                 return false;
 110         }
 111
 112         name = mode_option;
 113         namelen = strlen(name);
 114         for (i = namelen-1; i >= 0; i--) {
 115                 switch (name[i]) {
 116                 case '@':
 117                         namelen = i;
 118                         if (!refresh_specified && !bpp_specified &&
 119                             !yres_specified) {
 120                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 121                                 refresh_specified = 1;
 122                                 if (cvt || rb)
 123                                         cvt = 0;
 124                         } else
 125                                 goto done;
 126                         break;
 127                 case '-':
 128                         namelen = i;
 129                         if (!bpp_specified && !yres_specified) {
 130                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 131                                 bpp_specified = 1;
 132                                 if (cvt || rb)
 133                                         cvt = 0;
 134                         } else
 135                                 goto done;
 136                         break;
 137                 case 'x':
 138                         if (!yres_specified) {
 139                                 yres = simple_strtol(&name[i+1], NULL, 10);
 140                                 yres_specified = 1;
 141                         } else
 142                                 goto done;
 143                 case '0' ... '9':
 144                         break;
 145                 case 'M':
 146                         if (!yres_specified)
 147                                 cvt = 1;
 148                         break;
 149                 case 'R':
 150                         if (cvt)
 151                                 rb = 1;
 152                         break;
 153                 case 'm':
 154                         if (!cvt)
 155                                 margins = 1;
 156                         break;
 157                 case 'i':
 158                         if (!cvt)
 159                                 interlace = 1;
 160                         break;
 161                 case 'e':
 162                         force = DRM_FORCE_ON;
 163                         break;
 164                 case 'D':
 165                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 166                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 167                                 force = DRM_FORCE_ON;
 168                         else
 169                                 force = DRM_FORCE_ON_DIGITAL;
 170                         break;
 171                 case 'd':
 172                         force = DRM_FORCE_OFF;
 173                         break;
 174                 default:
 175                         goto done;
 176                 }
 177         }
 178         if (i < 0 && yres_specified) {
 179                 xres = simple_strtol(name, NULL, 10);
 180                 res_specified = 1;
 181         }
 182 done:
 183
 184         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 185                 drm_get_connector_name(connector), xres, yres,
 186                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 187                 "", (margins) ? " with margins" : "", (interlace) ?
 188                 " interlaced" : "");
 189
 190         if (force) {
 191                 const char *s;
 192                 switch (force) {
 193                 case DRM_FORCE_OFF: s = "OFF"; break;
 194                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 195                 default:
 196                 case DRM_FORCE_ON: s = "ON"; break;
 197                 }
 198
 199                 DRM_INFO("forcing %s connector %s\n",
 200                          drm_get_connector_name(connector), s);
 201                 connector->force = force;
 202         }
 203
 204         if (res_specified) {
 205                 cmdline_mode->specified = true;
 206                 cmdline_mode->xres = xres;
 207                 cmdline_mode->yres = yres;
 208         }
 209
 210         if (refresh_specified) {
 211                 cmdline_mode->refresh_specified = true;
 212                 cmdline_mode->refresh = refresh;
 213         }
 214
 215         if (bpp_specified) {
 216                 cmdline_mode->bpp_specified = true;
 217                 cmdline_mode->bpp = bpp;
 218         }
 219         cmdline_mode->rb = rb ? true : false;
 220         cmdline_mode->cvt = cvt  ? true : false;
 221         cmdline_mode->interlace = interlace ? true : false;
 222
 223         return true;
 224 }
 225
 226 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 227 {
 228         struct drm_fb_helper_connector *fb_helper_conn;
 229         int i;
 230
 231         for (i = 0; i < fb_helper->connector_count; i++) {
 232                 char *option = NULL;
 233
 234                 fb_helper_conn = fb_helper->connector_info[i];
 235
 236                 /* do something on return - turn off connector maybe */
 237                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
 238                         continue;
 239
 240                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
 241         }
 242         return 0;
 243 }
 244
 245 int drm_fb_helper_debug_enter(struct fb_info *info)
 246 {
 247         struct drm_fb_helper *helper = info->par;
 248         struct drm_crtc_helper_funcs *funcs;
 249         int i;
 250
 251         if (list_empty(&kernel_fb_helper_list))
 252                 return false;
 253
 254         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 255                 for (i = 0; i < helper->crtc_count; i++) {
 256                         struct drm_mode_set *mode_set =
 257                                 &helper->crtc_info[i].mode_set;
 258
 259                         if (!mode_set->crtc->enabled)
 260                                 continue;
 261
 262                         funcs = mode_set->crtc->helper_private;
 263                         funcs->mode_set_base_atomic(mode_set->crtc,
 264                                                     mode_set->fb,
 265                                                     mode_set->x,
 266                                                     mode_set->y);
 267
 268                 }
 269         }
 270
 271         return 0;
 272 }
 273 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 274
 275 /* Find the real fb for a given fb helper CRTC */
 276 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 277 {
 278         struct drm_device *dev = crtc->dev;
 279         struct drm_crtc *c;
 280
 281         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 282                 if (crtc->base.id == c->base.id)
 283                         return c->fb;
 284         }
 285
 286         return NULL;
 287 }
 288
 289 int drm_fb_helper_debug_leave(struct fb_info *info)
 290 {
 291         struct drm_fb_helper *helper = info->par;
 292         struct drm_crtc *crtc;
 293         struct drm_crtc_helper_funcs *funcs;
 294         struct drm_framebuffer *fb;
 295         int i;
 296
 297         for (i = 0; i < helper->crtc_count; i++) {
 298                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 299                 crtc = mode_set->crtc;
 300                 funcs = crtc->helper_private;
 301                 fb = drm_mode_config_fb(crtc);
 302
 303                 if (!crtc->enabled)
 304                         continue;
 305
 306                 if (!fb) {
 307                         DRM_ERROR("no fb to restore??\n");
 308                         continue;
 309                 }
 310
 311                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 312                                             crtc->y);
 313         }
 314
 315         return 0;
 316 }
 317 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 318
 319 bool drm_fb_helper_force_kernel_mode(void)
 320 {
 321         int i = 0;
 322         bool ret, error = false;
 323         struct drm_fb_helper *helper;
 324
 325         if (list_empty(&kernel_fb_helper_list))
 326                 return false;
 327
 328         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 329                 for (i = 0; i < helper->crtc_count; i++) {
 330                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 331                         ret = drm_crtc_helper_set_config(mode_set);
 332                         if (ret)
 333                                 error = true;
 334                 }
 335         }
 336         return error;
 337 }
 338
 339 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 340                         void *panic_str)
 341 {
 342         printk(KERN_ERR "panic occurred, switching back to text console\n");
 343         return drm_fb_helper_force_kernel_mode();
 344         return 0;
 345 }
 346 EXPORT_SYMBOL(drm_fb_helper_panic);
 347
 348 static struct notifier_block paniced = {
 349         .notifier_call = drm_fb_helper_panic,
 350 };
 351
 352 /**
 353  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 354  *
 355  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 356  */
 357 void drm_fb_helper_restore(void)
 358 {
 359         bool ret;
 360         ret = drm_fb_helper_force_kernel_mode();
 361         if (ret == true)
 362                 DRM_ERROR("Failed to restore crtc configuration\n");
 363 }
 364 EXPORT_SYMBOL(drm_fb_helper_restore);
 365
 366 #ifdef CONFIG_MAGIC_SYSRQ
 367 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 368 {
 369         drm_fb_helper_restore();
 370 }
 371 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 372
 373 static void drm_fb_helper_sysrq(int dummy1)
 374 {
 375         schedule_work(&drm_fb_helper_restore_work);
 376 }
 377
 378 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 379         .handler = drm_fb_helper_sysrq,
 380         .help_msg = "force-fb(V)",
 381         .action_msg = "Restore framebuffer console",
 382 };
 383 #else
 384 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 385 #endif
 386
 387 static void drm_fb_helper_on(struct fb_info *info)
 388 {
 389         struct drm_fb_helper *fb_helper = info->par;
 390         struct drm_device *dev = fb_helper->dev;
 391         struct drm_crtc *crtc;
 392         struct drm_crtc_helper_funcs *crtc_funcs;
 393         struct drm_connector *connector;
 394         struct drm_encoder *encoder;
 395         int i, j;
 396
 397         /*
 398          * For each CRTC in this fb, turn the crtc on then,
 399          * find all associated encoders and turn them on.
 400          */
 401         mutex_lock(&dev->mode_config.mutex);
 402         for (i = 0; i < fb_helper->crtc_count; i++) {
 403                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 404                 crtc_funcs = crtc->helper_private;
 405
 406                 if (!crtc->enabled)
 407                         continue;
 408
 409                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 410
 411                 /* Walk the connectors & encoders on this fb turning them on */
 412                 for (j = 0; j < fb_helper->connector_count; j++) {
 413                         connector = fb_helper->connector_info[j]->connector;
 414                         connector->dpms = DRM_MODE_DPMS_ON;
 415                         drm_connector_property_set_value(connector,
 416                                                          dev->mode_config.dpms_property,
 417                                                          DRM_MODE_DPMS_ON);
 418                 }
 419                 /* Found a CRTC on this fb, now find encoders */
 420                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 421                         if (encoder->crtc == crtc) {
 422                                 struct drm_encoder_helper_funcs *encoder_funcs;
 423
 424                                 encoder_funcs = encoder->helper_private;
 425                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 426                         }
 427                 }
 428         }
 429         mutex_unlock(&dev->mode_config.mutex);
 430 }
 431
 432 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 433 {
 434         struct drm_fb_helper *fb_helper = info->par;
 435         struct drm_device *dev = fb_helper->dev;
 436         struct drm_crtc *crtc;
 437         struct drm_crtc_helper_funcs *crtc_funcs;
 438         struct drm_connector *connector;
 439         struct drm_encoder *encoder;
 440         int i, j;
 441
 442         /*
 443          * For each CRTC in this fb, find all associated encoders
 444          * and turn them off, then turn off the CRTC.
 445          */
 446         mutex_lock(&dev->mode_config.mutex);
 447         for (i = 0; i < fb_helper->crtc_count; i++) {
 448                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 449                 crtc_funcs = crtc->helper_private;
 450
 451                 if (!crtc->enabled)
 452                         continue;
 453
 454                 /* Walk the connectors on this fb and mark them off */
 455                 for (j = 0; j < fb_helper->connector_count; j++) {
 456                         connector = fb_helper->connector_info[j]->connector;
 457                         connector->dpms = dpms_mode;
 458                         drm_connector_property_set_value(connector,
 459                                                          dev->mode_config.dpms_property,
 460                                                          dpms_mode);
 461                 }
 462                 /* Found a CRTC on this fb, now find encoders */
 463                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 464                         if (encoder->crtc == crtc) {
 465                                 struct drm_encoder_helper_funcs *encoder_funcs;
 466
 467                                 encoder_funcs = encoder->helper_private;
 468                                 encoder_funcs->dpms(encoder, dpms_mode);
 469                         }
 470                 }
 471                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 472         }
 473         mutex_unlock(&dev->mode_config.mutex);
 474 }
 475
 476 int drm_fb_helper_blank(int blank, struct fb_info *info)
 477 {
 478         switch (blank) {
 479         /* Display: On; HSync: On, VSync: On */
 480         case FB_BLANK_UNBLANK:
 481                 drm_fb_helper_on(info);
 482                 break;
 483         /* Display: Off; HSync: On, VSync: On */
 484         case FB_BLANK_NORMAL:
 485                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 486                 break;
 487         /* Display: Off; HSync: Off, VSync: On */
 488         case FB_BLANK_HSYNC_SUSPEND:
 489                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 490                 break;
 491         /* Display: Off; HSync: On, VSync: Off */
 492         case FB_BLANK_VSYNC_SUSPEND:
 493                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 494                 break;
 495         /* Display: Off; HSync: Off, VSync: Off */
 496         case FB_BLANK_POWERDOWN:
 497                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 498                 break;
 499         }
 500         return 0;
 501 }
 502 EXPORT_SYMBOL(drm_fb_helper_blank);
 503
 504 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 505 {
 506         int i;
 507
 508         for (i = 0; i < helper->connector_count; i++)
 509                 kfree(helper->connector_info[i]);
 510         kfree(helper->connector_info);
 511         for (i = 0; i < helper->crtc_count; i++)
 512                 kfree(helper->crtc_info[i].mode_set.connectors);
 513         kfree(helper->crtc_info);
 514 }
 515
 516 int drm_fb_helper_init(struct drm_device *dev,
 517                        struct drm_fb_helper *fb_helper,
 518                        int crtc_count, int max_conn_count)
 519 {
 520         struct drm_crtc *crtc;
 521         int ret = 0;
 522         int i;
 523
 524         fb_helper->dev = dev;
 525
 526         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 527
 528         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 529         if (!fb_helper->crtc_info)
 530                 return -ENOMEM;
 531
 532         fb_helper->crtc_count = crtc_count;
 533         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 534         if (!fb_helper->connector_info) {
 535                 kfree(fb_helper->crtc_info);
 536                 return -ENOMEM;
 537         }
 538         fb_helper->connector_count = 0;
 539
 540         for (i = 0; i < crtc_count; i++) {
 541                 fb_helper->crtc_info[i].mode_set.connectors =
 542                         kcalloc(max_conn_count,
 543                                 sizeof(struct drm_connector *),
 544                                 GFP_KERNEL);
 545
 546                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 547                         ret = -ENOMEM;
 548                         goto out_free;
 549                 }
 550                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 551         }
 552
 553         i = 0;
 554         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 555                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 556                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 557                 i++;
 558         }
 559         fb_helper->conn_limit = max_conn_count;
 560         return 0;
 561 out_free:
 562         drm_fb_helper_crtc_free(fb_helper);
 563         return -ENOMEM;
 564 }
 565 EXPORT_SYMBOL(drm_fb_helper_init);
 566
 567 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 568 {
 569         if (!list_empty(&fb_helper->kernel_fb_list)) {
 570                 list_del(&fb_helper->kernel_fb_list);
 571                 if (list_empty(&kernel_fb_helper_list)) {
 572                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 573                         atomic_notifier_chain_unregister(&panic_notifier_list,
 574                                                          &paniced);
 575                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 576                 }
 577         }
 578
 579         drm_fb_helper_crtc_free(fb_helper);
 580
 581 }
 582 EXPORT_SYMBOL(drm_fb_helper_fini);
 583
 584 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 585                      u16 blue, u16 regno, struct fb_info *info)
 586 {
 587         struct drm_fb_helper *fb_helper = info->par;
 588         struct drm_framebuffer *fb = fb_helper->fb;
 589         int pindex;
 590
 591         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 592                 u32 *palette;
 593                 u32 value;
 594                 /* place color in psuedopalette */
 595                 if (regno > 16)
 596                         return -EINVAL;
 597                 palette = (u32 *)info->pseudo_palette;
 598                 red >>= (16 - info->var.red.length);
 599                 green >>= (16 - info->var.green.length);
 600                 blue >>= (16 - info->var.blue.length);
 601                 value = (red << info->var.red.offset) |
 602                         (green << info->var.green.offset) |
 603                         (blue << info->var.blue.offset);
 604                 palette[regno] = value;
 605                 return 0;
 606         }
 607
 608         pindex = regno;
 609
 610         if (fb->bits_per_pixel == 16) {
 611                 pindex = regno << 3;
 612
 613                 if (fb->depth == 16 && regno > 63)
 614                         return -EINVAL;
 615                 if (fb->depth == 15 && regno > 31)
 616                         return -EINVAL;
 617
 618                 if (fb->depth == 16) {
 619                         u16 r, g, b;
 620                         int i;
 621                         if (regno < 32) {
 622                                 for (i = 0; i < 8; i++)
 623                                         fb_helper->funcs->gamma_set(crtc, red,
 624                                                 green, blue, pindex + i);
 625                         }
 626
 627                         fb_helper->funcs->gamma_get(crtc, &r,
 628                                                     &g, &b,
 629                                                     pindex >> 1);
 630
 631                         for (i = 0; i < 4; i++)
 632                                 fb_helper->funcs->gamma_set(crtc, r,
 633                                                             green, b,
 634                                                             (pindex >> 1) + i);
 635                 }
 636         }
 637
 638         if (fb->depth != 16)
 639                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 640         return 0;
 641 }
 642
 643 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 644 {
 645         struct drm_fb_helper *fb_helper = info->par;
 646         struct drm_crtc_helper_funcs *crtc_funcs;
 647         u16 *red, *green, *blue, *transp;
 648         struct drm_crtc *crtc;
 649         int i, rc = 0;
 650         int start;
 651
 652         for (i = 0; i < fb_helper->crtc_count; i++) {
 653                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 654                 crtc_funcs = crtc->helper_private;
 655
 656                 red = cmap->red;
 657                 green = cmap->green;
 658                 blue = cmap->blue;
 659                 transp = cmap->transp;
 660                 start = cmap->start;
 661
 662                 for (i = 0; i < cmap->len; i++) {
 663                         u16 hred, hgreen, hblue, htransp = 0xffff;
 664
 665                         hred = *red++;
 666                         hgreen = *green++;
 667                         hblue = *blue++;
 668
 669                         if (transp)
 670                                 htransp = *transp++;
 671
 672                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 673                         if (rc)
 674                                 return rc;
 675                 }
 676                 crtc_funcs->load_lut(crtc);
 677         }
 678         return rc;
 679 }
 680 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 681
 682 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 683                             struct fb_info *info)
 684 {
 685         struct drm_fb_helper *fb_helper = info->par;
 686         struct drm_framebuffer *fb = fb_helper->fb;
 687         int depth;
 688
 689         if (var->pixclock != 0 || in_dbg_master())
 690                 return -EINVAL;
 691
 692         /* Need to resize the fb object !!! */
 693         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 694                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 695                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 696                           fb->width, fb->height, fb->bits_per_pixel);
 697                 return -EINVAL;
 698         }
 699
 700         switch (var->bits_per_pixel) {
 701         case 16:
 702                 depth = (var->green.length == 6) ? 16 : 15;
 703                 break;
 704         case 32:
 705                 depth = (var->transp.length > 0) ? 32 : 24;
 706                 break;
 707         default:
 708                 depth = var->bits_per_pixel;
 709                 break;
 710         }
 711
 712         switch (depth) {
 713         case 8:
 714                 var->red.offset = 0;
 715                 var->green.offset = 0;
 716                 var->blue.offset = 0;
 717                 var->red.length = 8;
 718                 var->green.length = 8;
 719                 var->blue.length = 8;
 720                 var->transp.length = 0;
 721                 var->transp.offset = 0;
 722                 break;
 723         case 15:
 724                 var->red.offset = 10;
 725                 var->green.offset = 5;
 726                 var->blue.offset = 0;
 727                 var->red.length = 5;
 728                 var->green.length = 5;
 729                 var->blue.length = 5;
 730                 var->transp.length = 1;
 731                 var->transp.offset = 15;
 732                 break;
 733         case 16:
 734                 var->red.offset = 11;
 735                 var->green.offset = 5;
 736                 var->blue.offset = 0;
 737                 var->red.length = 5;
 738                 var->green.length = 6;
 739                 var->blue.length = 5;
 740                 var->transp.length = 0;
 741                 var->transp.offset = 0;
 742                 break;
 743         case 24:
 744                 var->red.offset = 16;
 745                 var->green.offset = 8;
 746                 var->blue.offset = 0;
 747                 var->red.length = 8;
 748                 var->green.length = 8;
 749                 var->blue.length = 8;
 750                 var->transp.length = 0;
 751                 var->transp.offset = 0;
 752                 break;
 753         case 32:
 754                 var->red.offset = 16;
 755                 var->green.offset = 8;
 756                 var->blue.offset = 0;
 757                 var->red.length = 8;
 758                 var->green.length = 8;
 759                 var->blue.length = 8;
 760                 var->transp.length = 8;
 761                 var->transp.offset = 24;
 762                 break;
 763         default:
 764                 return -EINVAL;
 765         }
 766         return 0;
 767 }
 768 EXPORT_SYMBOL(drm_fb_helper_check_var);
 769
 770 /* this will let fbcon do the mode init */
 771 int drm_fb_helper_set_par(struct fb_info *info)
 772 {
 773         struct drm_fb_helper *fb_helper = info->par;
 774         struct drm_device *dev = fb_helper->dev;
 775         struct fb_var_screeninfo *var = &info->var;
 776         struct drm_crtc *crtc;
 777         int ret;
 778         int i;
 779
 780         if (var->pixclock != 0) {
 781                 DRM_ERROR("PIXEL CLOCK SET\n");
 782                 return -EINVAL;
 783         }
 784
 785         mutex_lock(&dev->mode_config.mutex);
 786         for (i = 0; i < fb_helper->crtc_count; i++) {
 787                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 788                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 789                 if (ret) {
 790                         mutex_unlock(&dev->mode_config.mutex);
 791                         return ret;
 792                 }
 793         }
 794         mutex_unlock(&dev->mode_config.mutex);
 795
 796         if (fb_helper->delayed_hotplug) {
 797                 fb_helper->delayed_hotplug = false;
 798                 drm_fb_helper_hotplug_event(fb_helper);
 799         }
 800         return 0;
 801 }
 802 EXPORT_SYMBOL(drm_fb_helper_set_par);
 803
 804 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 805                               struct fb_info *info)
 806 {
 807         struct drm_fb_helper *fb_helper = info->par;
 808         struct drm_device *dev = fb_helper->dev;
 809         struct drm_mode_set *modeset;
 810         struct drm_crtc *crtc;
 811         int ret = 0;
 812         int i;
 813
 814         mutex_lock(&dev->mode_config.mutex);
 815         for (i = 0; i < fb_helper->crtc_count; i++) {
 816                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 817
 818                 modeset = &fb_helper->crtc_info[i].mode_set;
 819
 820                 modeset->x = var->xoffset;
 821                 modeset->y = var->yoffset;
 822
 823                 if (modeset->num_connectors) {
 824                         ret = crtc->funcs->set_config(modeset);
 825                         if (!ret) {
 826                                 info->var.xoffset = var->xoffset;
 827                                 info->var.yoffset = var->yoffset;
 828                         }
 829                 }
 830         }
 831         mutex_unlock(&dev->mode_config.mutex);
 832         return ret;
 833 }
 834 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 835
 836 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 837                                   int preferred_bpp)
 838 {
 839         int new_fb = 0;
 840         int crtc_count = 0;
 841         int i;
 842         struct fb_info *info;
 843         struct drm_fb_helper_surface_size sizes;
 844         int gamma_size = 0;
 845
 846         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 847         sizes.surface_depth = 24;
 848         sizes.surface_bpp = 32;
 849         sizes.fb_width = (unsigned)-1;
 850         sizes.fb_height = (unsigned)-1;
 851
 852         /* if driver picks 8 or 16 by default use that
 853            for both depth/bpp */
 854         if (preferred_bpp != sizes.surface_bpp) {
 855                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 856         }
 857         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 858         for (i = 0; i < fb_helper->connector_count; i++) {
 859                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 860                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 861
 862                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 863
 864                 if (cmdline_mode->bpp_specified) {
 865                         switch (cmdline_mode->bpp) {
 866                         case 8:
 867                                 sizes.surface_depth = sizes.surface_bpp = 8;
 868                                 break;
 869                         case 15:
 870                                 sizes.surface_depth = 15;
 871                                 sizes.surface_bpp = 16;
 872                                 break;
 873                         case 16:
 874                                 sizes.surface_depth = sizes.surface_bpp = 16;
 875                                 break;
 876                         case 24:
 877                                 sizes.surface_depth = sizes.surface_bpp = 24;
 878                                 break;
 879                         case 32:
 880                                 sizes.surface_depth = 24;
 881                                 sizes.surface_bpp = 32;
 882                                 break;
 883                         }
 884                         break;
 885                 }
 886         }
 887
 888         crtc_count = 0;
 889         for (i = 0; i < fb_helper->crtc_count; i++) {
 890                 struct drm_display_mode *desired_mode;
 891                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 892
 893                 if (desired_mode) {
 894                         if (gamma_size == 0)
 895                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 896                         if (desired_mode->hdisplay < sizes.fb_width)
 897                                 sizes.fb_width = desired_mode->hdisplay;
 898                         if (desired_mode->vdisplay < sizes.fb_height)
 899                                 sizes.fb_height = desired_mode->vdisplay;
 900                         if (desired_mode->hdisplay > sizes.surface_width)
 901                                 sizes.surface_width = desired_mode->hdisplay;
 902                         if (desired_mode->vdisplay > sizes.surface_height)
 903                                 sizes.surface_height = desired_mode->vdisplay;
 904                         crtc_count++;
 905                 }
 906         }
 907
 908         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 909                 /* hmm everyone went away - assume VGA cable just fell out
 910                    and will come back later. */
 911                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 912                 sizes.fb_width = sizes.surface_width = 1024;
 913                 sizes.fb_height = sizes.surface_height = 768;
 914         }
 915
 916         /* push down into drivers */
 917         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 918         if (new_fb < 0)
 919                 return new_fb;
 920
 921         info = fb_helper->fbdev;
 922
 923         /* set the fb pointer */
 924         for (i = 0; i < fb_helper->crtc_count; i++) {
 925                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 926         }
 927
 928         if (new_fb) {
 929                 info->var.pixclock = 0;
 930                 if (register_framebuffer(info) < 0) {
 931                         return -EINVAL;
 932                 }
 933
 934                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 935                        info->fix.id);
 936
 937         } else {
 938                 drm_fb_helper_set_par(info);
 939         }
 940
 941         /* Switch back to kernel console on panic */
 942         /* multi card linked list maybe */
 943         if (list_empty(&kernel_fb_helper_list)) {
 944                 printk(KERN_INFO "drm: registered panic notifier\n");
 945                 atomic_notifier_chain_register(&panic_notifier_list,
 946                                                &paniced);
 947                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 948         }
 949         if (new_fb)
 950                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 951
 952         return 0;
 953 }
 954 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 955
 956 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 957                             uint32_t depth)
 958 {
 959         info->fix.type = FB_TYPE_PACKED_PIXELS;
 960         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 961                 FB_VISUAL_TRUECOLOR;
 962         info->fix.type_aux = 0;
 963         info->fix.xpanstep = 1; /* doing it in hw */
 964         info->fix.ypanstep = 1; /* doing it in hw */
 965         info->fix.ywrapstep = 0;
 966         info->fix.accel = FB_ACCEL_NONE;
 967         info->fix.type_aux = 0;
 968
 969         info->fix.line_length = pitch;
 970         return;
 971 }
 972 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 973
 974 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 975                             uint32_t fb_width, uint32_t fb_height)
 976 {
 977         struct drm_framebuffer *fb = fb_helper->fb;
 978         info->pseudo_palette = fb_helper->pseudo_palette;
 979         info->var.xres_virtual = fb->width;
 980         info->var.yres_virtual = fb->height;
 981         info->var.bits_per_pixel = fb->bits_per_pixel;
 982         info->var.xoffset = 0;
 983         info->var.yoffset = 0;
 984         info->var.activate = FB_ACTIVATE_NOW;
 985         info->var.height = -1;
 986         info->var.width = -1;
 987
 988         switch (fb->depth) {
 989         case 8:
 990                 info->var.red.offset = 0;
 991                 info->var.green.offset = 0;
 992                 info->var.blue.offset = 0;
 993                 info->var.red.length = 8; /* 8bit DAC */
 994                 info->var.green.length = 8;
 995                 info->var.blue.length = 8;
 996                 info->var.transp.offset = 0;
 997                 info->var.transp.length = 0;
 998                 break;
 999         case 15:
1000                 info->var.red.offset = 10;
1001                 info->var.green.offset = 5;
1002                 info->var.blue.offset = 0;
1003                 info->var.red.length = 5;
1004                 info->var.green.length = 5;
1005                 info->var.blue.length = 5;
1006                 info->var.transp.offset = 15;
1007                 info->var.transp.length = 1;
1008                 break;
1009         case 16:
1010                 info->var.red.offset = 11;
1011                 info->var.green.offset = 5;
1012                 info->var.blue.offset = 0;
1013                 info->var.red.length = 5;
1014                 info->var.green.length = 6;
1015                 info->var.blue.length = 5;
1016                 info->var.transp.offset = 0;
1017                 break;
1018         case 24:
1019                 info->var.red.offset = 16;
1020                 info->var.green.offset = 8;
1021                 info->var.blue.offset = 0;
1022                 info->var.red.length = 8;
1023                 info->var.green.length = 8;
1024                 info->var.blue.length = 8;
1025                 info->var.transp.offset = 0;
1026                 info->var.transp.length = 0;
1027                 break;
1028         case 32:
1029                 info->var.red.offset = 16;
1030                 info->var.green.offset = 8;
1031                 info->var.blue.offset = 0;
1032                 info->var.red.length = 8;
1033                 info->var.green.length = 8;
1034                 info->var.blue.length = 8;
1035                 info->var.transp.offset = 24;
1036                 info->var.transp.length = 8;
1037                 break;
1038         default:
1039                 break;
1040         }
1041
1042         info->var.xres = fb_width;
1043         info->var.yres = fb_height;
1044 }
1045 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1046
1047 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1048                                                uint32_t maxX,
1049                                                uint32_t maxY)
1050 {
1051         struct drm_connector *connector;
1052         int count = 0;
1053         int i;
1054
1055         for (i = 0; i < fb_helper->connector_count; i++) {
1056                 connector = fb_helper->connector_info[i]->connector;
1057                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1058         }
1059
1060         return count;
1061 }
1062
1063 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1064 {
1065         struct drm_display_mode *mode;
1066
1067         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1068                 if (drm_mode_width(mode) > width ||
1069                     drm_mode_height(mode) > height)
1070                         continue;
1071                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1072                         return mode;
1073         }
1074         return NULL;
1075 }
1076
1077 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1078 {
1079         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1080         cmdline_mode = &fb_connector->cmdline_mode;
1081         return cmdline_mode->specified;
1082 }
1083
1084 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1085                                                       int width, int height)
1086 {
1087         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1088         struct drm_display_mode *mode = NULL;
1089
1090         cmdline_mode = &fb_helper_conn->cmdline_mode;
1091         if (cmdline_mode->specified == false)
1092                 return mode;
1093
1094         /* attempt to find a matching mode in the list of modes
1095          *  we have gotten so far, if not add a CVT mode that conforms
1096          */
1097         if (cmdline_mode->rb || cmdline_mode->margins)
1098                 goto create_mode;
1099
1100         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1101                 /* check width/height */
1102                 if (mode->hdisplay != cmdline_mode->xres ||
1103                     mode->vdisplay != cmdline_mode->yres)
1104                         continue;
1105
1106                 if (cmdline_mode->refresh_specified) {
1107                         if (mode->vrefresh != cmdline_mode->refresh)
1108                                 continue;
1109                 }
1110
1111                 if (cmdline_mode->interlace) {
1112                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1113                                 continue;
1114                 }
1115                 return mode;
1116         }
1117
1118 create_mode:
1119         if (cmdline_mode->cvt)
1120                 mode = drm_cvt_mode(fb_helper_conn->connector->dev,
1121                                     cmdline_mode->xres, cmdline_mode->yres,
1122                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1123                                     cmdline_mode->rb, cmdline_mode->interlace,
1124                                     cmdline_mode->margins);
1125         else
1126                 mode = drm_gtf_mode(fb_helper_conn->connector->dev,
1127                                     cmdline_mode->xres, cmdline_mode->yres,
1128                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1129                                     cmdline_mode->interlace,
1130                                     cmdline_mode->margins);
1131         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1132         list_add(&mode->head, &fb_helper_conn->connector->modes);
1133         return mode;
1134 }
1135
1136 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1137 {
1138         bool enable;
1139
1140         if (strict) {
1141                 enable = connector->status == connector_status_connected;
1142         } else {
1143                 enable = connector->status != connector_status_disconnected;
1144         }
1145         return enable;
1146 }
1147
1148 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1149                                   bool *enabled)
1150 {
1151         bool any_enabled = false;
1152         struct drm_connector *connector;
1153         int i = 0;
1154
1155         for (i = 0; i < fb_helper->connector_count; i++) {
1156                 connector = fb_helper->connector_info[i]->connector;
1157                 enabled[i] = drm_connector_enabled(connector, true);
1158                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1159                           enabled[i] ? "yes" : "no");
1160                 any_enabled |= enabled[i];
1161         }
1162
1163         if (any_enabled)
1164                 return;
1165
1166         for (i = 0; i < fb_helper->connector_count; i++) {
1167                 connector = fb_helper->connector_info[i]->connector;
1168                 enabled[i] = drm_connector_enabled(connector, false);
1169         }
1170 }
1171
1172 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1173                               struct drm_display_mode **modes,
1174                               bool *enabled, int width, int height)
1175 {
1176         int count, i, j;
1177         bool can_clone = false;
1178         struct drm_fb_helper_connector *fb_helper_conn;
1179         struct drm_display_mode *dmt_mode, *mode;
1180
1181         /* only contemplate cloning in the single crtc case */
1182         if (fb_helper->crtc_count > 1)
1183                 return false;
1184
1185         count = 0;
1186         for (i = 0; i < fb_helper->connector_count; i++) {
1187                 if (enabled[i])
1188                         count++;
1189         }
1190
1191         /* only contemplate cloning if more than one connector is enabled */
1192         if (count <= 1)
1193                 return false;
1194
1195         /* check the command line or if nothing common pick 1024x768 */
1196         can_clone = true;
1197         for (i = 0; i < fb_helper->connector_count; i++) {
1198                 if (!enabled[i])
1199                         continue;
1200                 fb_helper_conn = fb_helper->connector_info[i];
1201                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1202                 if (!modes[i]) {
1203                         can_clone = false;
1204                         break;
1205                 }
1206                 for (j = 0; j < i; j++) {
1207                         if (!enabled[j])
1208                                 continue;
1209                         if (!drm_mode_equal(modes[j], modes[i]))
1210                                 can_clone = false;
1211                 }
1212         }
1213
1214         if (can_clone) {
1215                 DRM_DEBUG_KMS("can clone using command line\n");
1216                 return true;
1217         }
1218
1219         /* try and find a 1024x768 mode on each connector */
1220         can_clone = true;
1221         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1222
1223         for (i = 0; i < fb_helper->connector_count; i++) {
1224
1225                 if (!enabled[i])
1226                         continue;
1227
1228                 fb_helper_conn = fb_helper->connector_info[i];
1229                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1230                         if (drm_mode_equal(mode, dmt_mode))
1231                                 modes[i] = mode;
1232                 }
1233                 if (!modes[i])
1234                         can_clone = false;
1235         }
1236
1237         if (can_clone) {
1238                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1239                 return true;
1240         }
1241         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1242         return false;
1243 }
1244
1245 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1246                                  struct drm_display_mode **modes,
1247                                  bool *enabled, int width, int height)
1248 {
1249         struct drm_fb_helper_connector *fb_helper_conn;
1250         int i;
1251
1252         for (i = 0; i < fb_helper->connector_count; i++) {
1253                 fb_helper_conn = fb_helper->connector_info[i];
1254
1255                 if (enabled[i] == false)
1256                         continue;
1257
1258                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1259                               fb_helper_conn->connector->base.id);
1260
1261                 /* got for command line mode first */
1262                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1263                 if (!modes[i]) {
1264                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1265                                       fb_helper_conn->connector->base.id);
1266                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1267                 }
1268                 /* No preferred modes, pick one off the list */
1269                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1270                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1271                                 break;
1272                 }
1273                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1274                           "none");
1275         }
1276         return true;
1277 }
1278
1279 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1280                           struct drm_fb_helper_crtc **best_crtcs,
1281                           struct drm_display_mode **modes,
1282                           int n, int width, int height)
1283 {
1284         int c, o;
1285         struct drm_device *dev = fb_helper->dev;
1286         struct drm_connector *connector;
1287         struct drm_connector_helper_funcs *connector_funcs;
1288         struct drm_encoder *encoder;
1289         struct drm_fb_helper_crtc *best_crtc;
1290         int my_score, best_score, score;
1291         struct drm_fb_helper_crtc **crtcs, *crtc;
1292         struct drm_fb_helper_connector *fb_helper_conn;
1293
1294         if (n == fb_helper->connector_count)
1295                 return 0;
1296
1297         fb_helper_conn = fb_helper->connector_info[n];
1298         connector = fb_helper_conn->connector;
1299
1300         best_crtcs[n] = NULL;
1301         best_crtc = NULL;
1302         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1303         if (modes[n] == NULL)
1304                 return best_score;
1305
1306         crtcs = kzalloc(dev->mode_config.num_connector *
1307                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1308         if (!crtcs)
1309                 return best_score;
1310
1311         my_score = 1;
1312         if (connector->status == connector_status_connected)
1313                 my_score++;
1314         if (drm_has_cmdline_mode(fb_helper_conn))
1315                 my_score++;
1316         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1317                 my_score++;
1318
1319         connector_funcs = connector->helper_private;
1320         encoder = connector_funcs->best_encoder(connector);
1321         if (!encoder)
1322                 goto out;
1323
1324         /* select a crtc for this connector and then attempt to configure
1325            remaining connectors */
1326         for (c = 0; c < fb_helper->crtc_count; c++) {
1327                 crtc = &fb_helper->crtc_info[c];
1328
1329                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1330                         continue;
1331                 }
1332
1333                 for (o = 0; o < n; o++)
1334                         if (best_crtcs[o] == crtc)
1335                                 break;
1336
1337                 if (o < n) {
1338                         /* ignore cloning unless only a single crtc */
1339                         if (fb_helper->crtc_count > 1)
1340                                 continue;
1341
1342                         if (!drm_mode_equal(modes[o], modes[n]))
1343                                 continue;
1344                 }
1345
1346                 crtcs[n] = crtc;
1347                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1348                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1349                                                   width, height);
1350                 if (score > best_score) {
1351                         best_crtc = crtc;
1352                         best_score = score;
1353                         memcpy(best_crtcs, crtcs,
1354                                dev->mode_config.num_connector *
1355                                sizeof(struct drm_fb_helper_crtc *));
1356                 }
1357         }
1358 out:
1359         kfree(crtcs);
1360         return best_score;
1361 }
1362
1363 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1364 {
1365         struct drm_device *dev = fb_helper->dev;
1366         struct drm_fb_helper_crtc **crtcs;
1367         struct drm_display_mode **modes;
1368         struct drm_encoder *encoder;
1369         struct drm_mode_set *modeset;
1370         bool *enabled;
1371         int width, height;
1372         int i, ret;
1373
1374         DRM_DEBUG_KMS("\n");
1375
1376         width = dev->mode_config.max_width;
1377         height = dev->mode_config.max_height;
1378
1379         /* clean out all the encoder/crtc combos */
1380         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1381                 encoder->crtc = NULL;
1382         }
1383
1384         crtcs = kcalloc(dev->mode_config.num_connector,
1385                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1386         modes = kcalloc(dev->mode_config.num_connector,
1387                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1388         enabled = kcalloc(dev->mode_config.num_connector,
1389                           sizeof(bool), GFP_KERNEL);
1390
1391         drm_enable_connectors(fb_helper, enabled);
1392
1393         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1394         if (!ret) {
1395                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1396                 if (!ret)
1397                         DRM_ERROR("Unable to find initial modes\n");
1398         }
1399
1400         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1401
1402         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1403
1404         /* need to set the modesets up here for use later */
1405         /* fill out the connector<->crtc mappings into the modesets */
1406         for (i = 0; i < fb_helper->crtc_count; i++) {
1407                 modeset = &fb_helper->crtc_info[i].mode_set;
1408                 modeset->num_connectors = 0;
1409         }
1410
1411         for (i = 0; i < fb_helper->connector_count; i++) {
1412                 struct drm_display_mode *mode = modes[i];
1413                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1414                 modeset = &fb_crtc->mode_set;
1415
1416                 if (mode && fb_crtc) {
1417                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1418                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1419                         fb_crtc->desired_mode = mode;
1420                         if (modeset->mode)
1421                                 drm_mode_destroy(dev, modeset->mode);
1422                         modeset->mode = drm_mode_duplicate(dev,
1423                                                            fb_crtc->desired_mode);
1424                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1425                 }
1426         }
1427
1428         kfree(crtcs);
1429         kfree(modes);
1430         kfree(enabled);
1431 }
1432
1433 /**
1434  * drm_helper_initial_config - setup a sane initial connector configuration
1435  * @dev: DRM device
1436  *
1437  * LOCKING:
1438  * Called at init time, must take mode config lock.
1439  *
1440  * Scan the CRTCs and connectors and try to put together an initial setup.
1441  * At the moment, this is a cloned configuration across all heads with
1442  * a new framebuffer object as the backing store.
1443  *
1444  * RETURNS:
1445  * Zero if everything went ok, nonzero otherwise.
1446  */
1447 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1448 {
1449         struct drm_device *dev = fb_helper->dev;
1450         int count = 0;
1451
1452         /* disable all the possible outputs/crtcs before entering KMS mode */
1453         drm_helper_disable_unused_functions(fb_helper->dev);
1454
1455         drm_fb_helper_parse_command_line(fb_helper);
1456
1457         count = drm_fb_helper_probe_connector_modes(fb_helper,
1458                                                     dev->mode_config.max_width,
1459                                                     dev->mode_config.max_height);
1460         /*
1461          * we shouldn't end up with no modes here.
1462          */
1463         if (count == 0) {
1464                 printk(KERN_INFO "No connectors reported connected with modes\n");
1465         }
1466         drm_setup_crtcs(fb_helper);
1467
1468         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1469 }
1470 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1471
1472 bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1473 {
1474         int count = 0;
1475         u32 max_width, max_height, bpp_sel;
1476         bool bound = false, crtcs_bound = false;
1477         struct drm_crtc *crtc;
1478
1479         if (!fb_helper->fb)
1480                 return false;
1481
1482         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1483                 if (crtc->fb)
1484                         crtcs_bound = true;
1485                 if (crtc->fb == fb_helper->fb)
1486                         bound = true;
1487         }
1488
1489         if (!bound && crtcs_bound) {
1490                 fb_helper->delayed_hotplug = true;
1491                 return false;
1492         }
1493         DRM_DEBUG_KMS("\n");
1494
1495         max_width = fb_helper->fb->width;
1496         max_height = fb_helper->fb->height;
1497         bpp_sel = fb_helper->fb->bits_per_pixel;
1498
1499         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1500                                                     max_height);
1501         drm_setup_crtcs(fb_helper);
1502
1503         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1504 }
1505 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1506