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