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 = fb_helper_conn->connector;
  98
  99         if (!fb_helper_conn)
 100                 return false;
 101
 102         cmdline_mode = &fb_helper_conn->cmdline_mode;
 103         if (!mode_option)
 104                 mode_option = fb_mode_option;
 105
 106         if (!mode_option) {
 107                 cmdline_mode->specified = false;
 108                 return false;
 109         }
 110
 111         name = mode_option;
 112         namelen = strlen(name);
 113         for (i = namelen-1; i >= 0; i--) {
 114                 switch (name[i]) {
 115                 case '@':
 116                         namelen = i;
 117                         if (!refresh_specified && !bpp_specified &&
 118                             !yres_specified) {
 119                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 120                                 refresh_specified = 1;
 121                                 if (cvt || rb)
 122                                         cvt = 0;
 123                         } else
 124                                 goto done;
 125                         break;
 126                 case '-':
 127                         namelen = i;
 128                         if (!bpp_specified && !yres_specified) {
 129                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 130                                 bpp_specified = 1;
 131                                 if (cvt || rb)
 132                                         cvt = 0;
 133                         } else
 134                                 goto done;
 135                         break;
 136                 case 'x':
 137                         if (!yres_specified) {
 138                                 yres = simple_strtol(&name[i+1], NULL, 10);
 139                                 yres_specified = 1;
 140                         } else
 141                                 goto done;
 142                 case '0' ... '9':
 143                         break;
 144                 case 'M':
 145                         if (!yres_specified)
 146                                 cvt = 1;
 147                         break;
 148                 case 'R':
 149                         if (!cvt)
 150                                 rb = 1;
 151                         break;
 152                 case 'm':
 153                         if (!cvt)
 154                                 margins = 1;
 155                         break;
 156                 case 'i':
 157                         if (!cvt)
 158                                 interlace = 1;
 159                         break;
 160                 case 'e':
 161                         force = DRM_FORCE_ON;
 162                         break;
 163                 case 'D':
 164                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 165                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 166                                 force = DRM_FORCE_ON;
 167                         else
 168                                 force = DRM_FORCE_ON_DIGITAL;
 169                         break;
 170                 case 'd':
 171                         force = DRM_FORCE_OFF;
 172                         break;
 173                 default:
 174                         goto done;
 175                 }
 176         }
 177         if (i < 0 && yres_specified) {
 178                 xres = simple_strtol(name, NULL, 10);
 179                 res_specified = 1;
 180         }
 181 done:
 182
 183         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 184                 drm_get_connector_name(connector), xres, yres,
 185                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 186                 "", (margins) ? " with margins" : "", (interlace) ?
 187                 " interlaced" : "");
 188
 189         if (force) {
 190                 const char *s;
 191                 switch (force) {
 192                 case DRM_FORCE_OFF: s = "OFF"; break;
 193                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 194                 default:
 195                 case DRM_FORCE_ON: s = "ON"; break;
 196                 }
 197
 198                 DRM_INFO("forcing %s connector %s\n",
 199                          drm_get_connector_name(connector), s);
 200                 connector->force = force;
 201         }
 202
 203         if (res_specified) {
 204                 cmdline_mode->specified = true;
 205                 cmdline_mode->xres = xres;
 206                 cmdline_mode->yres = yres;
 207         }
 208
 209         if (refresh_specified) {
 210                 cmdline_mode->refresh_specified = true;
 211                 cmdline_mode->refresh = refresh;
 212         }
 213
 214         if (bpp_specified) {
 215                 cmdline_mode->bpp_specified = true;
 216                 cmdline_mode->bpp = bpp;
 217         }
 218         cmdline_mode->rb = rb ? true : false;
 219         cmdline_mode->cvt = cvt  ? true : false;
 220         cmdline_mode->interlace = interlace ? true : false;
 221
 222         return true;
 223 }
 224
 225 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 226 {
 227         struct drm_fb_helper_connector *fb_helper_conn;
 228         int i;
 229
 230         for (i = 0; i < fb_helper->connector_count; i++) {
 231                 char *option = NULL;
 232
 233                 fb_helper_conn = fb_helper->connector_info[i];
 234
 235                 /* do something on return - turn off connector maybe */
 236                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
 237                         continue;
 238
 239                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
 240         }
 241         return 0;
 242 }
 243
 244 bool drm_fb_helper_force_kernel_mode(void)
 245 {
 246         int i = 0;
 247         bool ret, error = false;
 248         struct drm_fb_helper *helper;
 249
 250         if (list_empty(&kernel_fb_helper_list))
 251                 return false;
 252
 253         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 254                 for (i = 0; i < helper->crtc_count; i++) {
 255                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 256                         ret = drm_crtc_helper_set_config(mode_set);
 257                         if (ret)
 258                                 error = true;
 259                 }
 260         }
 261         return error;
 262 }
 263
 264 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 265                         void *panic_str)
 266 {
 267         DRM_ERROR("panic occurred, switching back to text console\n");
 268         return drm_fb_helper_force_kernel_mode();
 269         return 0;
 270 }
 271 EXPORT_SYMBOL(drm_fb_helper_panic);
 272
 273 static struct notifier_block paniced = {
 274         .notifier_call = drm_fb_helper_panic,
 275 };
 276
 277 /**
 278  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 279  *
 280  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 281  */
 282 void drm_fb_helper_restore(void)
 283 {
 284         bool ret;
 285         ret = drm_fb_helper_force_kernel_mode();
 286         if (ret == true)
 287                 DRM_ERROR("Failed to restore crtc configuration\n");
 288 }
 289 EXPORT_SYMBOL(drm_fb_helper_restore);
 290
 291 #ifdef CONFIG_MAGIC_SYSRQ
 292 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 293 {
 294         drm_fb_helper_restore();
 295 }
 296 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 297
 298 static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
 299 {
 300         schedule_work(&drm_fb_helper_restore_work);
 301 }
 302
 303 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 304         .handler = drm_fb_helper_sysrq,
 305         .help_msg = "force-fb(V)",
 306         .action_msg = "Restore framebuffer console",
 307 };
 308 #else
 309 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 310 #endif
 311
 312 static void drm_fb_helper_on(struct fb_info *info)
 313 {
 314         struct drm_fb_helper *fb_helper = info->par;
 315         struct drm_device *dev = fb_helper->dev;
 316         struct drm_crtc *crtc;
 317         struct drm_crtc_helper_funcs *crtc_funcs;
 318         struct drm_encoder *encoder;
 319         int i;
 320
 321         /*
 322          * For each CRTC in this fb, turn the crtc on then,
 323          * find all associated encoders and turn them on.
 324          */
 325         mutex_lock(&dev->mode_config.mutex);
 326         for (i = 0; i < fb_helper->crtc_count; i++) {
 327                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 328                 crtc_funcs = crtc->helper_private;
 329
 330                 if (!crtc->enabled)
 331                         continue;
 332
 333                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 334
 335
 336                 /* Found a CRTC on this fb, now find encoders */
 337                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 338                         if (encoder->crtc == crtc) {
 339                                 struct drm_encoder_helper_funcs *encoder_funcs;
 340
 341                                 encoder_funcs = encoder->helper_private;
 342                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 343                         }
 344                 }
 345         }
 346         mutex_unlock(&dev->mode_config.mutex);
 347 }
 348
 349 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 350 {
 351         struct drm_fb_helper *fb_helper = info->par;
 352         struct drm_device *dev = fb_helper->dev;
 353         struct drm_crtc *crtc;
 354         struct drm_crtc_helper_funcs *crtc_funcs;
 355         struct drm_encoder *encoder;
 356         int i;
 357
 358         /*
 359          * For each CRTC in this fb, find all associated encoders
 360          * and turn them off, then turn off the CRTC.
 361          */
 362         mutex_lock(&dev->mode_config.mutex);
 363         for (i = 0; i < fb_helper->crtc_count; i++) {
 364                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 365                 crtc_funcs = crtc->helper_private;
 366
 367                 if (!crtc->enabled)
 368                         continue;
 369
 370                 /* Found a CRTC on this fb, now find encoders */
 371                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 372                         if (encoder->crtc == crtc) {
 373                                 struct drm_encoder_helper_funcs *encoder_funcs;
 374
 375                                 encoder_funcs = encoder->helper_private;
 376                                 encoder_funcs->dpms(encoder, dpms_mode);
 377                         }
 378                 }
 379                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 380         }
 381         mutex_unlock(&dev->mode_config.mutex);
 382 }
 383
 384 int drm_fb_helper_blank(int blank, struct fb_info *info)
 385 {
 386         switch (blank) {
 387         /* Display: On; HSync: On, VSync: On */
 388         case FB_BLANK_UNBLANK:
 389                 drm_fb_helper_on(info);
 390                 break;
 391         /* Display: Off; HSync: On, VSync: On */
 392         case FB_BLANK_NORMAL:
 393                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 394                 break;
 395         /* Display: Off; HSync: Off, VSync: On */
 396         case FB_BLANK_HSYNC_SUSPEND:
 397                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 398                 break;
 399         /* Display: Off; HSync: On, VSync: Off */
 400         case FB_BLANK_VSYNC_SUSPEND:
 401                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 402                 break;
 403         /* Display: Off; HSync: Off, VSync: Off */
 404         case FB_BLANK_POWERDOWN:
 405                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 406                 break;
 407         }
 408         return 0;
 409 }
 410 EXPORT_SYMBOL(drm_fb_helper_blank);
 411
 412 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 413 {
 414         int i;
 415
 416         for (i = 0; i < helper->connector_count; i++)
 417                 kfree(helper->connector_info[i]);
 418         kfree(helper->connector_info);
 419         for (i = 0; i < helper->crtc_count; i++)
 420                 kfree(helper->crtc_info[i].mode_set.connectors);
 421         kfree(helper->crtc_info);
 422 }
 423
 424 int drm_fb_helper_init(struct drm_device *dev,
 425                        struct drm_fb_helper *fb_helper,
 426                        int crtc_count, int max_conn_count)
 427 {
 428         struct drm_crtc *crtc;
 429         int ret = 0;
 430         int i;
 431
 432         fb_helper->dev = dev;
 433
 434         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 435
 436         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 437         if (!fb_helper->crtc_info)
 438                 return -ENOMEM;
 439
 440         fb_helper->crtc_count = crtc_count;
 441         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 442         if (!fb_helper->connector_info) {
 443                 kfree(fb_helper->crtc_info);
 444                 return -ENOMEM;
 445         }
 446         fb_helper->connector_count = 0;
 447
 448         for (i = 0; i < crtc_count; i++) {
 449                 fb_helper->crtc_info[i].mode_set.connectors =
 450                         kcalloc(max_conn_count,
 451                                 sizeof(struct drm_connector *),
 452                                 GFP_KERNEL);
 453
 454                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 455                         ret = -ENOMEM;
 456                         goto out_free;
 457                 }
 458                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 459         }
 460
 461         i = 0;
 462         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 463                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 464                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 465                 i++;
 466         }
 467         fb_helper->conn_limit = max_conn_count;
 468         return 0;
 469 out_free:
 470         drm_fb_helper_crtc_free(fb_helper);
 471         return -ENOMEM;
 472 }
 473 EXPORT_SYMBOL(drm_fb_helper_init);
 474
 475 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 476 {
 477         if (!list_empty(&fb_helper->kernel_fb_list)) {
 478                 list_del(&fb_helper->kernel_fb_list);
 479                 if (list_empty(&kernel_fb_helper_list)) {
 480                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 481                         atomic_notifier_chain_unregister(&panic_notifier_list,
 482                                                          &paniced);
 483                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 484                 }
 485         }
 486
 487         drm_fb_helper_crtc_free(fb_helper);
 488
 489 }
 490 EXPORT_SYMBOL(drm_fb_helper_fini);
 491
 492 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 493                      u16 blue, u16 regno, struct fb_info *info)
 494 {
 495         struct drm_fb_helper *fb_helper = info->par;
 496         struct drm_framebuffer *fb = fb_helper->fb;
 497         int pindex;
 498
 499         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 500                 u32 *palette;
 501                 u32 value;
 502                 /* place color in psuedopalette */
 503                 if (regno > 16)
 504                         return -EINVAL;
 505                 palette = (u32 *)info->pseudo_palette;
 506                 red >>= (16 - info->var.red.length);
 507                 green >>= (16 - info->var.green.length);
 508                 blue >>= (16 - info->var.blue.length);
 509                 value = (red << info->var.red.offset) |
 510                         (green << info->var.green.offset) |
 511                         (blue << info->var.blue.offset);
 512                 palette[regno] = value;
 513                 return 0;
 514         }
 515
 516         pindex = regno;
 517
 518         if (fb->bits_per_pixel == 16) {
 519                 pindex = regno << 3;
 520
 521                 if (fb->depth == 16 && regno > 63)
 522                         return -EINVAL;
 523                 if (fb->depth == 15 && regno > 31)
 524                         return -EINVAL;
 525
 526                 if (fb->depth == 16) {
 527                         u16 r, g, b;
 528                         int i;
 529                         if (regno < 32) {
 530                                 for (i = 0; i < 8; i++)
 531                                         fb_helper->funcs->gamma_set(crtc, red,
 532                                                 green, blue, pindex + i);
 533                         }
 534
 535                         fb_helper->funcs->gamma_get(crtc, &r,
 536                                                     &g, &b,
 537                                                     pindex >> 1);
 538
 539                         for (i = 0; i < 4; i++)
 540                                 fb_helper->funcs->gamma_set(crtc, r,
 541                                                             green, b,
 542                                                             (pindex >> 1) + i);
 543                 }
 544         }
 545
 546         if (fb->depth != 16)
 547                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 548         return 0;
 549 }
 550
 551 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 552 {
 553         struct drm_fb_helper *fb_helper = info->par;
 554         struct drm_crtc_helper_funcs *crtc_funcs;
 555         u16 *red, *green, *blue, *transp;
 556         struct drm_crtc *crtc;
 557         int i, rc = 0;
 558         int start;
 559
 560         for (i = 0; i < fb_helper->crtc_count; i++) {
 561                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 562                 crtc_funcs = crtc->helper_private;
 563
 564                 red = cmap->red;
 565                 green = cmap->green;
 566                 blue = cmap->blue;
 567                 transp = cmap->transp;
 568                 start = cmap->start;
 569
 570                 for (i = 0; i < cmap->len; i++) {
 571                         u16 hred, hgreen, hblue, htransp = 0xffff;
 572
 573                         hred = *red++;
 574                         hgreen = *green++;
 575                         hblue = *blue++;
 576
 577                         if (transp)
 578                                 htransp = *transp++;
 579
 580                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 581                         if (rc)
 582                                 return rc;
 583                 }
 584                 crtc_funcs->load_lut(crtc);
 585         }
 586         return rc;
 587 }
 588 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 589
 590 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 591                             struct fb_info *info)
 592 {
 593         struct drm_fb_helper *fb_helper = info->par;
 594         struct drm_framebuffer *fb = fb_helper->fb;
 595         int depth;
 596
 597         if (var->pixclock != 0)
 598                 return -EINVAL;
 599
 600         /* Need to resize the fb object !!! */
 601         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 602                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 603                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 604                           fb->width, fb->height, fb->bits_per_pixel);
 605                 return -EINVAL;
 606         }
 607
 608         switch (var->bits_per_pixel) {
 609         case 16:
 610                 depth = (var->green.length == 6) ? 16 : 15;
 611                 break;
 612         case 32:
 613                 depth = (var->transp.length > 0) ? 32 : 24;
 614                 break;
 615         default:
 616                 depth = var->bits_per_pixel;
 617                 break;
 618         }
 619
 620         switch (depth) {
 621         case 8:
 622                 var->red.offset = 0;
 623                 var->green.offset = 0;
 624                 var->blue.offset = 0;
 625                 var->red.length = 8;
 626                 var->green.length = 8;
 627                 var->blue.length = 8;
 628                 var->transp.length = 0;
 629                 var->transp.offset = 0;
 630                 break;
 631         case 15:
 632                 var->red.offset = 10;
 633                 var->green.offset = 5;
 634                 var->blue.offset = 0;
 635                 var->red.length = 5;
 636                 var->green.length = 5;
 637                 var->blue.length = 5;
 638                 var->transp.length = 1;
 639                 var->transp.offset = 15;
 640                 break;
 641         case 16:
 642                 var->red.offset = 11;
 643                 var->green.offset = 5;
 644                 var->blue.offset = 0;
 645                 var->red.length = 5;
 646                 var->green.length = 6;
 647                 var->blue.length = 5;
 648                 var->transp.length = 0;
 649                 var->transp.offset = 0;
 650                 break;
 651         case 24:
 652                 var->red.offset = 16;
 653                 var->green.offset = 8;
 654                 var->blue.offset = 0;
 655                 var->red.length = 8;
 656                 var->green.length = 8;
 657                 var->blue.length = 8;
 658                 var->transp.length = 0;
 659                 var->transp.offset = 0;
 660                 break;
 661         case 32:
 662                 var->red.offset = 16;
 663                 var->green.offset = 8;
 664                 var->blue.offset = 0;
 665                 var->red.length = 8;
 666                 var->green.length = 8;
 667                 var->blue.length = 8;
 668                 var->transp.length = 8;
 669                 var->transp.offset = 24;
 670                 break;
 671         default:
 672                 return -EINVAL;
 673         }
 674         return 0;
 675 }
 676 EXPORT_SYMBOL(drm_fb_helper_check_var);
 677
 678 /* this will let fbcon do the mode init */
 679 int drm_fb_helper_set_par(struct fb_info *info)
 680 {
 681         struct drm_fb_helper *fb_helper = info->par;
 682         struct drm_device *dev = fb_helper->dev;
 683         struct fb_var_screeninfo *var = &info->var;
 684         struct drm_crtc *crtc;
 685         int ret;
 686         int i;
 687
 688         if (var->pixclock != 0) {
 689                 DRM_ERROR("PIXEL CLOCK SET\n");
 690                 return -EINVAL;
 691         }
 692
 693         mutex_lock(&dev->mode_config.mutex);
 694         for (i = 0; i < fb_helper->crtc_count; i++) {
 695                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 696                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 697                 if (ret) {
 698                         mutex_unlock(&dev->mode_config.mutex);
 699                         return ret;
 700                 }
 701         }
 702         mutex_unlock(&dev->mode_config.mutex);
 703
 704         if (fb_helper->delayed_hotplug) {
 705                 fb_helper->delayed_hotplug = false;
 706                 drm_fb_helper_hotplug_event(fb_helper);
 707         }
 708         return 0;
 709 }
 710 EXPORT_SYMBOL(drm_fb_helper_set_par);
 711
 712 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 713                               struct fb_info *info)
 714 {
 715         struct drm_fb_helper *fb_helper = info->par;
 716         struct drm_device *dev = fb_helper->dev;
 717         struct drm_mode_set *modeset;
 718         struct drm_crtc *crtc;
 719         int ret = 0;
 720         int i;
 721
 722         mutex_lock(&dev->mode_config.mutex);
 723         for (i = 0; i < fb_helper->crtc_count; i++) {
 724                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 725
 726                 modeset = &fb_helper->crtc_info[i].mode_set;
 727
 728                 modeset->x = var->xoffset;
 729                 modeset->y = var->yoffset;
 730
 731                 if (modeset->num_connectors) {
 732                         ret = crtc->funcs->set_config(modeset);
 733                         if (!ret) {
 734                                 info->var.xoffset = var->xoffset;
 735                                 info->var.yoffset = var->yoffset;
 736                         }
 737                 }
 738         }
 739         mutex_unlock(&dev->mode_config.mutex);
 740         return ret;
 741 }
 742 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 743
 744 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 745                                   int preferred_bpp)
 746 {
 747         int new_fb = 0;
 748         int crtc_count = 0;
 749         int i;
 750         struct fb_info *info;
 751         struct drm_fb_helper_surface_size sizes;
 752         int gamma_size = 0;
 753
 754         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 755         sizes.surface_depth = 24;
 756         sizes.surface_bpp = 32;
 757         sizes.fb_width = (unsigned)-1;
 758         sizes.fb_height = (unsigned)-1;
 759
 760         /* if driver picks 8 or 16 by default use that
 761            for both depth/bpp */
 762         if (preferred_bpp != sizes.surface_bpp) {
 763                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 764         }
 765         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 766         for (i = 0; i < fb_helper->connector_count; i++) {
 767                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 768                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 769
 770                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 771
 772                 if (cmdline_mode->bpp_specified) {
 773                         switch (cmdline_mode->bpp) {
 774                         case 8:
 775                                 sizes.surface_depth = sizes.surface_bpp = 8;
 776                                 break;
 777                         case 15:
 778                                 sizes.surface_depth = 15;
 779                                 sizes.surface_bpp = 16;
 780                                 break;
 781                         case 16:
 782                                 sizes.surface_depth = sizes.surface_bpp = 16;
 783                                 break;
 784                         case 24:
 785                                 sizes.surface_depth = sizes.surface_bpp = 24;
 786                                 break;
 787                         case 32:
 788                                 sizes.surface_depth = 24;
 789                                 sizes.surface_bpp = 32;
 790                                 break;
 791                         }
 792                         break;
 793                 }
 794         }
 795
 796         crtc_count = 0;
 797         for (i = 0; i < fb_helper->crtc_count; i++) {
 798                 struct drm_display_mode *desired_mode;
 799                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 800
 801                 if (desired_mode) {
 802                         if (gamma_size == 0)
 803                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 804                         if (desired_mode->hdisplay < sizes.fb_width)
 805                                 sizes.fb_width = desired_mode->hdisplay;
 806                         if (desired_mode->vdisplay < sizes.fb_height)
 807                                 sizes.fb_height = desired_mode->vdisplay;
 808                         if (desired_mode->hdisplay > sizes.surface_width)
 809                                 sizes.surface_width = desired_mode->hdisplay;
 810                         if (desired_mode->vdisplay > sizes.surface_height)
 811                                 sizes.surface_height = desired_mode->vdisplay;
 812                         crtc_count++;
 813                 }
 814         }
 815
 816         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 817                 /* hmm everyone went away - assume VGA cable just fell out
 818                    and will come back later. */
 819                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 820                 sizes.fb_width = sizes.surface_width = 1024;
 821                 sizes.fb_height = sizes.surface_height = 768;
 822         }
 823
 824         /* push down into drivers */
 825         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 826         if (new_fb < 0)
 827                 return new_fb;
 828
 829         info = fb_helper->fbdev;
 830
 831         /* set the fb pointer */
 832         for (i = 0; i < fb_helper->crtc_count; i++) {
 833                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 834         }
 835
 836         if (new_fb) {
 837                 info->var.pixclock = 0;
 838                 if (register_framebuffer(info) < 0) {
 839                         return -EINVAL;
 840                 }
 841
 842                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 843                        info->fix.id);
 844
 845         } else {
 846                 drm_fb_helper_set_par(info);
 847         }
 848
 849         /* Switch back to kernel console on panic */
 850         /* multi card linked list maybe */
 851         if (list_empty(&kernel_fb_helper_list)) {
 852                 printk(KERN_INFO "drm: registered panic notifier\n");
 853                 atomic_notifier_chain_register(&panic_notifier_list,
 854                                                &paniced);
 855                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 856         }
 857         if (new_fb)
 858                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 859
 860         return 0;
 861 }
 862 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 863
 864 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 865                             uint32_t depth)
 866 {
 867         info->fix.type = FB_TYPE_PACKED_PIXELS;
 868         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 869                 FB_VISUAL_TRUECOLOR;
 870         info->fix.type_aux = 0;
 871         info->fix.xpanstep = 1; /* doing it in hw */
 872         info->fix.ypanstep = 1; /* doing it in hw */
 873         info->fix.ywrapstep = 0;
 874         info->fix.accel = FB_ACCEL_NONE;
 875         info->fix.type_aux = 0;
 876
 877         info->fix.line_length = pitch;
 878         return;
 879 }
 880 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 881
 882 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 883                             uint32_t fb_width, uint32_t fb_height)
 884 {
 885         struct drm_framebuffer *fb = fb_helper->fb;
 886         info->pseudo_palette = fb_helper->pseudo_palette;
 887         info->var.xres_virtual = fb->width;
 888         info->var.yres_virtual = fb->height;
 889         info->var.bits_per_pixel = fb->bits_per_pixel;
 890         info->var.xoffset = 0;
 891         info->var.yoffset = 0;
 892         info->var.activate = FB_ACTIVATE_NOW;
 893         info->var.height = -1;
 894         info->var.width = -1;
 895
 896         switch (fb->depth) {
 897         case 8:
 898                 info->var.red.offset = 0;
 899                 info->var.green.offset = 0;
 900                 info->var.blue.offset = 0;
 901                 info->var.red.length = 8; /* 8bit DAC */
 902                 info->var.green.length = 8;
 903                 info->var.blue.length = 8;
 904                 info->var.transp.offset = 0;
 905                 info->var.transp.length = 0;
 906                 break;
 907         case 15:
 908                 info->var.red.offset = 10;
 909                 info->var.green.offset = 5;
 910                 info->var.blue.offset = 0;
 911                 info->var.red.length = 5;
 912                 info->var.green.length = 5;
 913                 info->var.blue.length = 5;
 914                 info->var.transp.offset = 15;
 915                 info->var.transp.length = 1;
 916                 break;
 917         case 16:
 918                 info->var.red.offset = 11;
 919                 info->var.green.offset = 5;
 920                 info->var.blue.offset = 0;
 921                 info->var.red.length = 5;
 922                 info->var.green.length = 6;
 923                 info->var.blue.length = 5;
 924                 info->var.transp.offset = 0;
 925                 break;
 926         case 24:
 927                 info->var.red.offset = 16;
 928                 info->var.green.offset = 8;
 929                 info->var.blue.offset = 0;
 930                 info->var.red.length = 8;
 931                 info->var.green.length = 8;
 932                 info->var.blue.length = 8;
 933                 info->var.transp.offset = 0;
 934                 info->var.transp.length = 0;
 935                 break;
 936         case 32:
 937                 info->var.red.offset = 16;
 938                 info->var.green.offset = 8;
 939                 info->var.blue.offset = 0;
 940                 info->var.red.length = 8;
 941                 info->var.green.length = 8;
 942                 info->var.blue.length = 8;
 943                 info->var.transp.offset = 24;
 944                 info->var.transp.length = 8;
 945                 break;
 946         default:
 947                 break;
 948         }
 949
 950         info->var.xres = fb_width;
 951         info->var.yres = fb_height;
 952 }
 953 EXPORT_SYMBOL(drm_fb_helper_fill_var);
 954
 955 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 956                                                uint32_t maxX,
 957                                                uint32_t maxY)
 958 {
 959         struct drm_connector *connector;
 960         int count = 0;
 961         int i;
 962
 963         for (i = 0; i < fb_helper->connector_count; i++) {
 964                 connector = fb_helper->connector_info[i]->connector;
 965                 count += connector->funcs->fill_modes(connector, maxX, maxY);
 966         }
 967
 968         return count;
 969 }
 970
 971 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
 972 {
 973         struct drm_display_mode *mode;
 974
 975         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
 976                 if (drm_mode_width(mode) > width ||
 977                     drm_mode_height(mode) > height)
 978                         continue;
 979                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
 980                         return mode;
 981         }
 982         return NULL;
 983 }
 984
 985 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
 986 {
 987         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 988         cmdline_mode = &fb_connector->cmdline_mode;
 989         return cmdline_mode->specified;
 990 }
 991
 992 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 993                                                       int width, int height)
 994 {
 995         struct drm_fb_helper_cmdline_mode *cmdline_mode;
 996         struct drm_display_mode *mode = NULL;
 997
 998         cmdline_mode = &fb_helper_conn->cmdline_mode;
 999         if (cmdline_mode->specified == false)
1000                 return mode;
1001
1002         /* attempt to find a matching mode in the list of modes
1003          *  we have gotten so far, if not add a CVT mode that conforms
1004          */
1005         if (cmdline_mode->rb || cmdline_mode->margins)
1006                 goto create_mode;
1007
1008         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1009                 /* check width/height */
1010                 if (mode->hdisplay != cmdline_mode->xres ||
1011                     mode->vdisplay != cmdline_mode->yres)
1012                         continue;
1013
1014                 if (cmdline_mode->refresh_specified) {
1015                         if (mode->vrefresh != cmdline_mode->refresh)
1016                                 continue;
1017                 }
1018
1019                 if (cmdline_mode->interlace) {
1020                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1021                                 continue;
1022                 }
1023                 return mode;
1024         }
1025
1026 create_mode:
1027         mode = drm_cvt_mode(fb_helper_conn->connector->dev, cmdline_mode->xres,
1028                             cmdline_mode->yres,
1029                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1030                             cmdline_mode->rb, cmdline_mode->interlace,
1031                             cmdline_mode->margins);
1032         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1033         list_add(&mode->head, &fb_helper_conn->connector->modes);
1034         return mode;
1035 }
1036
1037 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1038 {
1039         bool enable;
1040
1041         if (strict) {
1042                 enable = connector->status == connector_status_connected;
1043         } else {
1044                 enable = connector->status != connector_status_disconnected;
1045         }
1046         return enable;
1047 }
1048
1049 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1050                                   bool *enabled)
1051 {
1052         bool any_enabled = false;
1053         struct drm_connector *connector;
1054         int i = 0;
1055
1056         for (i = 0; i < fb_helper->connector_count; i++) {
1057                 connector = fb_helper->connector_info[i]->connector;
1058                 enabled[i] = drm_connector_enabled(connector, true);
1059                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1060                           enabled[i] ? "yes" : "no");
1061                 any_enabled |= enabled[i];
1062         }
1063
1064         if (any_enabled)
1065                 return;
1066
1067         for (i = 0; i < fb_helper->connector_count; i++) {
1068                 connector = fb_helper->connector_info[i]->connector;
1069                 enabled[i] = drm_connector_enabled(connector, false);
1070         }
1071 }
1072
1073 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1074                               struct drm_display_mode **modes,
1075                               bool *enabled, int width, int height)
1076 {
1077         int count, i, j;
1078         bool can_clone = false;
1079         struct drm_fb_helper_connector *fb_helper_conn;
1080         struct drm_display_mode *dmt_mode, *mode;
1081
1082         /* only contemplate cloning in the single crtc case */
1083         if (fb_helper->crtc_count > 1)
1084                 return false;
1085
1086         count = 0;
1087         for (i = 0; i < fb_helper->connector_count; i++) {
1088                 if (enabled[i])
1089                         count++;
1090         }
1091
1092         /* only contemplate cloning if more than one connector is enabled */
1093         if (count <= 1)
1094                 return false;
1095
1096         /* check the command line or if nothing common pick 1024x768 */
1097         can_clone = true;
1098         for (i = 0; i < fb_helper->connector_count; i++) {
1099                 if (!enabled[i])
1100                         continue;
1101                 fb_helper_conn = fb_helper->connector_info[i];
1102                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1103                 if (!modes[i]) {
1104                         can_clone = false;
1105                         break;
1106                 }
1107                 for (j = 0; j < i; j++) {
1108                         if (!enabled[j])
1109                                 continue;
1110                         if (!drm_mode_equal(modes[j], modes[i]))
1111                                 can_clone = false;
1112                 }
1113         }
1114
1115         if (can_clone) {
1116                 DRM_DEBUG_KMS("can clone using command line\n");
1117                 return true;
1118         }
1119
1120         /* try and find a 1024x768 mode on each connector */
1121         can_clone = true;
1122         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1123
1124         for (i = 0; i < fb_helper->connector_count; i++) {
1125
1126                 if (!enabled[i])
1127                         continue;
1128
1129                 fb_helper_conn = fb_helper->connector_info[i];
1130                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1131                         if (drm_mode_equal(mode, dmt_mode))
1132                                 modes[i] = mode;
1133                 }
1134                 if (!modes[i])
1135                         can_clone = false;
1136         }
1137
1138         if (can_clone) {
1139                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1140                 return true;
1141         }
1142         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1143         return false;
1144 }
1145
1146 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1147                                  struct drm_display_mode **modes,
1148                                  bool *enabled, int width, int height)
1149 {
1150         struct drm_fb_helper_connector *fb_helper_conn;
1151         int i;
1152
1153         for (i = 0; i < fb_helper->connector_count; i++) {
1154                 fb_helper_conn = fb_helper->connector_info[i];
1155
1156                 if (enabled[i] == false)
1157                         continue;
1158
1159                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1160                               fb_helper_conn->connector->base.id);
1161
1162                 /* got for command line mode first */
1163                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1164                 if (!modes[i]) {
1165                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1166                                       fb_helper_conn->connector->base.id);
1167                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1168                 }
1169                 /* No preferred modes, pick one off the list */
1170                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1171                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1172                                 break;
1173                 }
1174                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1175                           "none");
1176         }
1177         return true;
1178 }
1179
1180 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1181                           struct drm_fb_helper_crtc **best_crtcs,
1182                           struct drm_display_mode **modes,
1183                           int n, int width, int height)
1184 {
1185         int c, o;
1186         struct drm_device *dev = fb_helper->dev;
1187         struct drm_connector *connector;
1188         struct drm_connector_helper_funcs *connector_funcs;
1189         struct drm_encoder *encoder;
1190         struct drm_fb_helper_crtc *best_crtc;
1191         int my_score, best_score, score;
1192         struct drm_fb_helper_crtc **crtcs, *crtc;
1193         struct drm_fb_helper_connector *fb_helper_conn;
1194
1195         if (n == fb_helper->connector_count)
1196                 return 0;
1197
1198         fb_helper_conn = fb_helper->connector_info[n];
1199         connector = fb_helper_conn->connector;
1200
1201         best_crtcs[n] = NULL;
1202         best_crtc = NULL;
1203         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1204         if (modes[n] == NULL)
1205                 return best_score;
1206
1207         crtcs = kzalloc(dev->mode_config.num_connector *
1208                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1209         if (!crtcs)
1210                 return best_score;
1211
1212         my_score = 1;
1213         if (connector->status == connector_status_connected)
1214                 my_score++;
1215         if (drm_has_cmdline_mode(fb_helper_conn))
1216                 my_score++;
1217         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1218                 my_score++;
1219
1220         connector_funcs = connector->helper_private;
1221         encoder = connector_funcs->best_encoder(connector);
1222         if (!encoder)
1223                 goto out;
1224
1225         /* select a crtc for this connector and then attempt to configure
1226            remaining connectors */
1227         for (c = 0; c < fb_helper->crtc_count; c++) {
1228                 crtc = &fb_helper->crtc_info[c];
1229
1230                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1231                         continue;
1232                 }
1233
1234                 for (o = 0; o < n; o++)
1235                         if (best_crtcs[o] == crtc)
1236                                 break;
1237
1238                 if (o < n) {
1239                         /* ignore cloning unless only a single crtc */
1240                         if (fb_helper->crtc_count > 1)
1241                                 continue;
1242
1243                         if (!drm_mode_equal(modes[o], modes[n]))
1244                                 continue;
1245                 }
1246
1247                 crtcs[n] = crtc;
1248                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1249                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1250                                                   width, height);
1251                 if (score > best_score) {
1252                         best_crtc = crtc;
1253                         best_score = score;
1254                         memcpy(best_crtcs, crtcs,
1255                                dev->mode_config.num_connector *
1256                                sizeof(struct drm_fb_helper_crtc *));
1257                 }
1258         }
1259 out:
1260         kfree(crtcs);
1261         return best_score;
1262 }
1263
1264 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1265 {
1266         struct drm_device *dev = fb_helper->dev;
1267         struct drm_fb_helper_crtc **crtcs;
1268         struct drm_display_mode **modes;
1269         struct drm_encoder *encoder;
1270         struct drm_mode_set *modeset;
1271         bool *enabled;
1272         int width, height;
1273         int i, ret;
1274
1275         DRM_DEBUG_KMS("\n");
1276
1277         width = dev->mode_config.max_width;
1278         height = dev->mode_config.max_height;
1279
1280         /* clean out all the encoder/crtc combos */
1281         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1282                 encoder->crtc = NULL;
1283         }
1284
1285         crtcs = kcalloc(dev->mode_config.num_connector,
1286                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1287         modes = kcalloc(dev->mode_config.num_connector,
1288                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1289         enabled = kcalloc(dev->mode_config.num_connector,
1290                           sizeof(bool), GFP_KERNEL);
1291
1292         drm_enable_connectors(fb_helper, enabled);
1293
1294         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1295         if (!ret) {
1296                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1297                 if (!ret)
1298                         DRM_ERROR("Unable to find initial modes\n");
1299         }
1300
1301         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1302
1303         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1304
1305         /* need to set the modesets up here for use later */
1306         /* fill out the connector<->crtc mappings into the modesets */
1307         for (i = 0; i < fb_helper->crtc_count; i++) {
1308                 modeset = &fb_helper->crtc_info[i].mode_set;
1309                 modeset->num_connectors = 0;
1310         }
1311
1312         for (i = 0; i < fb_helper->connector_count; i++) {
1313                 struct drm_display_mode *mode = modes[i];
1314                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1315                 modeset = &fb_crtc->mode_set;
1316
1317                 if (mode && fb_crtc) {
1318                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1319                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1320                         fb_crtc->desired_mode = mode;
1321                         if (modeset->mode)
1322                                 drm_mode_destroy(dev, modeset->mode);
1323                         modeset->mode = drm_mode_duplicate(dev,
1324                                                            fb_crtc->desired_mode);
1325                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1326                 }
1327         }
1328
1329         kfree(crtcs);
1330         kfree(modes);
1331         kfree(enabled);
1332 }
1333
1334 /**
1335  * drm_helper_initial_config - setup a sane initial connector configuration
1336  * @dev: DRM device
1337  *
1338  * LOCKING:
1339  * Called at init time, must take mode config lock.
1340  *
1341  * Scan the CRTCs and connectors and try to put together an initial setup.
1342  * At the moment, this is a cloned configuration across all heads with
1343  * a new framebuffer object as the backing store.
1344  *
1345  * RETURNS:
1346  * Zero if everything went ok, nonzero otherwise.
1347  */
1348 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1349 {
1350         struct drm_device *dev = fb_helper->dev;
1351         int count = 0;
1352
1353         /* disable all the possible outputs/crtcs before entering KMS mode */
1354         drm_helper_disable_unused_functions(fb_helper->dev);
1355
1356         drm_fb_helper_parse_command_line(fb_helper);
1357
1358         count = drm_fb_helper_probe_connector_modes(fb_helper,
1359                                                     dev->mode_config.max_width,
1360                                                     dev->mode_config.max_height);
1361         /*
1362          * we shouldn't end up with no modes here.
1363          */
1364         if (count == 0) {
1365                 printk(KERN_INFO "No connectors reported connected with modes\n");
1366         }
1367         drm_setup_crtcs(fb_helper);
1368
1369         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1370 }
1371 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1372
1373 bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1374 {
1375         int count = 0;
1376         u32 max_width, max_height, bpp_sel;
1377         bool bound = false, crtcs_bound = false;
1378         struct drm_crtc *crtc;
1379
1380         if (!fb_helper->fb)
1381                 return false;
1382
1383         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1384                 if (crtc->fb)
1385                         crtcs_bound = true;
1386                 if (crtc->fb == fb_helper->fb)
1387                         bound = true;
1388         }
1389
1390         if (!bound && crtcs_bound) {
1391                 fb_helper->delayed_hotplug = true;
1392                 return false;
1393         }
1394         DRM_DEBUG_KMS("\n");
1395
1396         max_width = fb_helper->fb->width;
1397         max_height = fb_helper->fb->height;
1398         bpp_sel = fb_helper->fb->bits_per_pixel;
1399
1400         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1401                                                     max_height);
1402         drm_setup_crtcs(fb_helper);
1403
1404         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1405 }
1406 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1407