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 static LIST_HEAD(kernel_fb_helper_list);
  43
  44 /**
  45  * DOC: fbdev helpers
  46  *
  47  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  48  * mode setting driver. They can be used mostly independently from the crtc
  49  * helper functions used by many drivers to implement the kernel mode setting
  50  * interfaces.
  51  *
  52  * Initialization is done as a three-step process with drm_fb_helper_init(),
  53  * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
  54  * Drivers with fancier requirements than the default behaviour can override the
  55  * second step with their own code.  Teardown is done with drm_fb_helper_fini().
  56  *
  57  * At runtime drivers should restore the fbdev console by calling
  58  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  59  * should also notify the fb helper code from updates to the output
  60  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  61  * integration with the output polling code in drm_crtc_helper.c the modeset
  62  * code provides a ->output_poll_changed callback.
  63  *
  64  * All other functions exported by the fb helper library can be used to
  65  * implement the fbdev driver interface by the driver.
  66  */
  67
  68 /**
  69  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  70  *                                             emulation helper
  71  * @fb_helper: fbdev initialized with drm_fb_helper_init
  72  *
  73  * This functions adds all the available connectors for use with the given
  74  * fb_helper. This is a separate step to allow drivers to freely assign
  75  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  76  * not adequate to be used for the fbcon.
  77  *
  78  * Since this is part of the initial setup before the fbdev is published, no
  79  * locking is required.
  80  */
  81 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  82 {
  83         struct drm_device *dev = fb_helper->dev;
  84         struct drm_connector *connector;
  85         int i;
  86
  87         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  88                 struct drm_fb_helper_connector *fb_helper_connector;
  89
  90                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  91                 if (!fb_helper_connector)
  92                         goto fail;
  93
  94                 fb_helper_connector->connector = connector;
  95                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  96         }
  97         return 0;
  98 fail:
  99         for (i = 0; i < fb_helper->connector_count; i++) {
 100                 kfree(fb_helper->connector_info[i]);
 101                 fb_helper->connector_info[i] = NULL;
 102         }
 103         fb_helper->connector_count = 0;
 104         return -ENOMEM;
 105 }
 106 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 107
 108 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 109 {
 110         struct drm_fb_helper_connector *fb_helper_conn;
 111         int i;
 112
 113         for (i = 0; i < fb_helper->connector_count; i++) {
 114                 struct drm_cmdline_mode *mode;
 115                 struct drm_connector *connector;
 116                 char *option = NULL;
 117
 118                 fb_helper_conn = fb_helper->connector_info[i];
 119                 connector = fb_helper_conn->connector;
 120                 mode = &fb_helper_conn->cmdline_mode;
 121
 122                 /* do something on return - turn off connector maybe */
 123                 if (fb_get_options(connector->name, &option))
 124                         continue;
 125
 126                 if (drm_mode_parse_command_line_for_connector(option,
 127                                                               connector,
 128                                                               mode)) {
 129                         if (mode->force) {
 130                                 const char *s;
 131                                 switch (mode->force) {
 132                                 case DRM_FORCE_OFF:
 133                                         s = "OFF";
 134                                         break;
 135                                 case DRM_FORCE_ON_DIGITAL:
 136                                         s = "ON - dig";
 137                                         break;
 138                                 default:
 139                                 case DRM_FORCE_ON:
 140                                         s = "ON";
 141                                         break;
 142                                 }
 143
 144                                 DRM_INFO("forcing %s connector %s\n",
 145                                          connector->name, s);
 146                                 connector->force = mode->force;
 147                         }
 148
 149                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 150                                       connector->name,
 151                                       mode->xres, mode->yres,
 152                                       mode->refresh_specified ? mode->refresh : 60,
 153                                       mode->rb ? " reduced blanking" : "",
 154                                       mode->margins ? " with margins" : "",
 155                                       mode->interlace ?  " interlaced" : "");
 156                 }
 157
 158         }
 159         return 0;
 160 }
 161
 162 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 163 {
 164         uint16_t *r_base, *g_base, *b_base;
 165         int i;
 166
 167         if (helper->funcs->gamma_get == NULL)
 168                 return;
 169
 170         r_base = crtc->gamma_store;
 171         g_base = r_base + crtc->gamma_size;
 172         b_base = g_base + crtc->gamma_size;
 173
 174         for (i = 0; i < crtc->gamma_size; i++)
 175                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 176 }
 177
 178 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 179 {
 180         uint16_t *r_base, *g_base, *b_base;
 181
 182         if (crtc->funcs->gamma_set == NULL)
 183                 return;
 184
 185         r_base = crtc->gamma_store;
 186         g_base = r_base + crtc->gamma_size;
 187         b_base = g_base + crtc->gamma_size;
 188
 189         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 190 }
 191
 192 /**
 193  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 194  * @info: fbdev registered by the helper
 195  */
 196 int drm_fb_helper_debug_enter(struct fb_info *info)
 197 {
 198         struct drm_fb_helper *helper = info->par;
 199         struct drm_crtc_helper_funcs *funcs;
 200         int i;
 201
 202         if (list_empty(&kernel_fb_helper_list))
 203                 return false;
 204
 205         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 206                 for (i = 0; i < helper->crtc_count; i++) {
 207                         struct drm_mode_set *mode_set =
 208                                 &helper->crtc_info[i].mode_set;
 209
 210                         if (!mode_set->crtc->enabled)
 211                                 continue;
 212
 213                         funcs = mode_set->crtc->helper_private;
 214                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 215                         funcs->mode_set_base_atomic(mode_set->crtc,
 216                                                     mode_set->fb,
 217                                                     mode_set->x,
 218                                                     mode_set->y,
 219                                                     ENTER_ATOMIC_MODE_SET);
 220                 }
 221         }
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 226
 227 /* Find the real fb for a given fb helper CRTC */
 228 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 229 {
 230         struct drm_device *dev = crtc->dev;
 231         struct drm_crtc *c;
 232
 233         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 234                 if (crtc->base.id == c->base.id)
 235                         return c->primary->fb;
 236         }
 237
 238         return NULL;
 239 }
 240
 241 /**
 242  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 243  * @info: fbdev registered by the helper
 244  */
 245 int drm_fb_helper_debug_leave(struct fb_info *info)
 246 {
 247         struct drm_fb_helper *helper = info->par;
 248         struct drm_crtc *crtc;
 249         struct drm_crtc_helper_funcs *funcs;
 250         struct drm_framebuffer *fb;
 251         int i;
 252
 253         for (i = 0; i < helper->crtc_count; i++) {
 254                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 255                 crtc = mode_set->crtc;
 256                 funcs = crtc->helper_private;
 257                 fb = drm_mode_config_fb(crtc);
 258
 259                 if (!crtc->enabled)
 260                         continue;
 261
 262                 if (!fb) {
 263                         DRM_ERROR("no fb to restore??\n");
 264                         continue;
 265                 }
 266
 267                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 268                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 269                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 270         }
 271
 272         return 0;
 273 }
 274 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 275
 276 /**
 277  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 278  * @fb_helper: fbcon to restore
 279  *
 280  * This should be called from driver's drm ->lastclose callback
 281  * when implementing an fbcon on top of kms using this helper. This ensures that
 282  * the user isn't greeted with a black screen when e.g. X dies.
 283  */
 284 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 285 {
 286         struct drm_device *dev = fb_helper->dev;
 287         struct drm_plane *plane;
 288         bool error = false;
 289         int i;
 290
 291         drm_warn_on_modeset_not_all_locked(dev);
 292
 293         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 294                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 295                         drm_plane_force_disable(plane);
 296
 297         for (i = 0; i < fb_helper->crtc_count; i++) {
 298                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 299                 struct drm_crtc *crtc = mode_set->crtc;
 300                 int ret;
 301
 302                 if (crtc->funcs->cursor_set) {
 303                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 304                         if (ret)
 305                                 error = true;
 306                 }
 307
 308                 ret = drm_mode_set_config_internal(mode_set);
 309                 if (ret)
 310                         error = true;
 311         }
 312         return error;
 313 }
 314 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 315
 316 /*
 317  * restore fbcon display for all kms driver's using this helper, used for sysrq
 318  * and panic handling.
 319  */
 320 static bool drm_fb_helper_force_kernel_mode(void)
 321 {
 322         bool ret, error = false;
 323         struct drm_fb_helper *helper;
 324
 325         if (list_empty(&kernel_fb_helper_list))
 326                 return false;
 327
 328         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 329                 struct drm_device *dev = helper->dev;
 330
 331                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 332                         continue;
 333
 334                 if (!mutex_trylock(&dev->mode_config.mutex)) {
 335                         error = true;
 336                         continue;
 337                 }
 338
 339                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 340                 if (ret)
 341                         error = true;
 342
 343                 mutex_unlock(&dev->mode_config.mutex);
 344         }
 345         return error;
 346 }
 347
 348 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 349                         void *panic_str)
 350 {
 351         /*
 352          * It's a waste of time and effort to switch back to text console
 353          * if the kernel should reboot before panic messages can be seen.
 354          */
 355         if (panic_timeout < 0)
 356                 return 0;
 357
 358         pr_err("panic occurred, switching back to text console\n");
 359         return drm_fb_helper_force_kernel_mode();
 360 }
 361
 362 static struct notifier_block paniced = {
 363         .notifier_call = drm_fb_helper_panic,
 364 };
 365
 366 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 367 {
 368         struct drm_device *dev = fb_helper->dev;
 369         struct drm_crtc *crtc;
 370         int bound = 0, crtcs_bound = 0;
 371
 372         /* Sometimes user space wants everything disabled, so don't steal the
 373          * display if there's a master. */
 374         if (dev->primary->master)
 375                 return false;
 376
 377         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 378                 if (crtc->primary->fb)
 379                         crtcs_bound++;
 380                 if (crtc->primary->fb == fb_helper->fb)
 381                         bound++;
 382         }
 383
 384         if (bound < crtcs_bound)
 385                 return false;
 386
 387         return true;
 388 }
 389
 390 #ifdef CONFIG_MAGIC_SYSRQ
 391 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 392 {
 393         bool ret;
 394         ret = drm_fb_helper_force_kernel_mode();
 395         if (ret == true)
 396                 DRM_ERROR("Failed to restore crtc configuration\n");
 397 }
 398 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 399
 400 static void drm_fb_helper_sysrq(int dummy1)
 401 {
 402         schedule_work(&drm_fb_helper_restore_work);
 403 }
 404
 405 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 406         .handler = drm_fb_helper_sysrq,
 407         .help_msg = "force-fb(V)",
 408         .action_msg = "Restore framebuffer console",
 409 };
 410 #else
 411 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 412 #endif
 413
 414 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 415 {
 416         struct drm_fb_helper *fb_helper = info->par;
 417         struct drm_device *dev = fb_helper->dev;
 418         struct drm_crtc *crtc;
 419         struct drm_connector *connector;
 420         int i, j;
 421
 422         /*
 423          * fbdev->blank can be called from irq context in case of a panic.
 424          * Since we already have our own special panic handler which will
 425          * restore the fbdev console mode completely, just bail out early.
 426          */
 427         if (oops_in_progress)
 428                 return;
 429
 430         /*
 431          * For each CRTC in this fb, turn the connectors on/off.
 432          */
 433         drm_modeset_lock_all(dev);
 434         if (!drm_fb_helper_is_bound(fb_helper)) {
 435                 drm_modeset_unlock_all(dev);
 436                 return;
 437         }
 438
 439         for (i = 0; i < fb_helper->crtc_count; i++) {
 440                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 441
 442                 if (!crtc->enabled)
 443                         continue;
 444
 445                 /* Walk the connectors & encoders on this fb turning them on/off */
 446                 for (j = 0; j < fb_helper->connector_count; j++) {
 447                         connector = fb_helper->connector_info[j]->connector;
 448                         connector->funcs->dpms(connector, dpms_mode);
 449                         drm_object_property_set_value(&connector->base,
 450                                 dev->mode_config.dpms_property, dpms_mode);
 451                 }
 452         }
 453         drm_modeset_unlock_all(dev);
 454 }
 455
 456 /**
 457  * drm_fb_helper_blank - implementation for ->fb_blank
 458  * @blank: desired blanking state
 459  * @info: fbdev registered by the helper
 460  */
 461 int drm_fb_helper_blank(int blank, struct fb_info *info)
 462 {
 463         switch (blank) {
 464         /* Display: On; HSync: On, VSync: On */
 465         case FB_BLANK_UNBLANK:
 466                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 467                 break;
 468         /* Display: Off; HSync: On, VSync: On */
 469         case FB_BLANK_NORMAL:
 470                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 471                 break;
 472         /* Display: Off; HSync: Off, VSync: On */
 473         case FB_BLANK_HSYNC_SUSPEND:
 474                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 475                 break;
 476         /* Display: Off; HSync: On, VSync: Off */
 477         case FB_BLANK_VSYNC_SUSPEND:
 478                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 479                 break;
 480         /* Display: Off; HSync: Off, VSync: Off */
 481         case FB_BLANK_POWERDOWN:
 482                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 483                 break;
 484         }
 485         return 0;
 486 }
 487 EXPORT_SYMBOL(drm_fb_helper_blank);
 488
 489 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 490 {
 491         int i;
 492
 493         for (i = 0; i < helper->connector_count; i++)
 494                 kfree(helper->connector_info[i]);
 495         kfree(helper->connector_info);
 496         for (i = 0; i < helper->crtc_count; i++) {
 497                 kfree(helper->crtc_info[i].mode_set.connectors);
 498                 if (helper->crtc_info[i].mode_set.mode)
 499                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 500         }
 501         kfree(helper->crtc_info);
 502 }
 503
 504 /**
 505  * drm_fb_helper_init - initialize a drm_fb_helper structure
 506  * @dev: drm device
 507  * @fb_helper: driver-allocated fbdev helper structure to initialize
 508  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 509  * @max_conn_count: max connector count
 510  *
 511  * This allocates the structures for the fbdev helper with the given limits.
 512  * Note that this won't yet touch the hardware (through the driver interfaces)
 513  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 514  * to allow driver writes more control over the exact init sequence.
 515  *
 516  * Drivers must set fb_helper->funcs before calling
 517  * drm_fb_helper_initial_config().
 518  *
 519  * RETURNS:
 520  * Zero if everything went ok, nonzero otherwise.
 521  */
 522 int drm_fb_helper_init(struct drm_device *dev,
 523                        struct drm_fb_helper *fb_helper,
 524                        int crtc_count, int max_conn_count)
 525 {
 526         struct drm_crtc *crtc;
 527         int i;
 528
 529         if (!max_conn_count)
 530                 return -EINVAL;
 531
 532         fb_helper->dev = dev;
 533
 534         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 535
 536         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 537         if (!fb_helper->crtc_info)
 538                 return -ENOMEM;
 539
 540         fb_helper->crtc_count = crtc_count;
 541         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 542         if (!fb_helper->connector_info) {
 543                 kfree(fb_helper->crtc_info);
 544                 return -ENOMEM;
 545         }
 546         fb_helper->connector_count = 0;
 547
 548         for (i = 0; i < crtc_count; i++) {
 549                 fb_helper->crtc_info[i].mode_set.connectors =
 550                         kcalloc(max_conn_count,
 551                                 sizeof(struct drm_connector *),
 552                                 GFP_KERNEL);
 553
 554                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 555                         goto out_free;
 556                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 557         }
 558
 559         i = 0;
 560         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 561                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 562                 i++;
 563         }
 564
 565         return 0;
 566 out_free:
 567         drm_fb_helper_crtc_free(fb_helper);
 568         return -ENOMEM;
 569 }
 570 EXPORT_SYMBOL(drm_fb_helper_init);
 571
 572 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 573 {
 574         if (!list_empty(&fb_helper->kernel_fb_list)) {
 575                 list_del(&fb_helper->kernel_fb_list);
 576                 if (list_empty(&kernel_fb_helper_list)) {
 577                         pr_info("drm: unregistered panic notifier\n");
 578                         atomic_notifier_chain_unregister(&panic_notifier_list,
 579                                                          &paniced);
 580                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 581                 }
 582         }
 583
 584         drm_fb_helper_crtc_free(fb_helper);
 585
 586 }
 587 EXPORT_SYMBOL(drm_fb_helper_fini);
 588
 589 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 590                      u16 blue, u16 regno, struct fb_info *info)
 591 {
 592         struct drm_fb_helper *fb_helper = info->par;
 593         struct drm_framebuffer *fb = fb_helper->fb;
 594         int pindex;
 595
 596         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 597                 u32 *palette;
 598                 u32 value;
 599                 /* place color in psuedopalette */
 600                 if (regno > 16)
 601                         return -EINVAL;
 602                 palette = (u32 *)info->pseudo_palette;
 603                 red >>= (16 - info->var.red.length);
 604                 green >>= (16 - info->var.green.length);
 605                 blue >>= (16 - info->var.blue.length);
 606                 value = (red << info->var.red.offset) |
 607                         (green << info->var.green.offset) |
 608                         (blue << info->var.blue.offset);
 609                 if (info->var.transp.length > 0) {
 610                         u32 mask = (1 << info->var.transp.length) - 1;
 611                         mask <<= info->var.transp.offset;
 612                         value |= mask;
 613                 }
 614                 palette[regno] = value;
 615                 return 0;
 616         }
 617
 618         /*
 619          * The driver really shouldn't advertise pseudo/directcolor
 620          * visuals if it can't deal with the palette.
 621          */
 622         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 623                     !fb_helper->funcs->gamma_get))
 624                 return -EINVAL;
 625
 626         pindex = regno;
 627
 628         if (fb->bits_per_pixel == 16) {
 629                 pindex = regno << 3;
 630
 631                 if (fb->depth == 16 && regno > 63)
 632                         return -EINVAL;
 633                 if (fb->depth == 15 && regno > 31)
 634                         return -EINVAL;
 635
 636                 if (fb->depth == 16) {
 637                         u16 r, g, b;
 638                         int i;
 639                         if (regno < 32) {
 640                                 for (i = 0; i < 8; i++)
 641                                         fb_helper->funcs->gamma_set(crtc, red,
 642                                                 green, blue, pindex + i);
 643                         }
 644
 645                         fb_helper->funcs->gamma_get(crtc, &r,
 646                                                     &g, &b,
 647                                                     pindex >> 1);
 648
 649                         for (i = 0; i < 4; i++)
 650                                 fb_helper->funcs->gamma_set(crtc, r,
 651                                                             green, b,
 652                                                             (pindex >> 1) + i);
 653                 }
 654         }
 655
 656         if (fb->depth != 16)
 657                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 658         return 0;
 659 }
 660
 661 /**
 662  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 663  * @cmap: cmap to set
 664  * @info: fbdev registered by the helper
 665  */
 666 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 667 {
 668         struct drm_fb_helper *fb_helper = info->par;
 669         struct drm_device *dev = fb_helper->dev;
 670         struct drm_crtc_helper_funcs *crtc_funcs;
 671         u16 *red, *green, *blue, *transp;
 672         struct drm_crtc *crtc;
 673         int i, j, rc = 0;
 674         int start;
 675
 676         drm_modeset_lock_all(dev);
 677         if (!drm_fb_helper_is_bound(fb_helper)) {
 678                 drm_modeset_unlock_all(dev);
 679                 return -EBUSY;
 680         }
 681
 682         for (i = 0; i < fb_helper->crtc_count; i++) {
 683                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 684                 crtc_funcs = crtc->helper_private;
 685
 686                 red = cmap->red;
 687                 green = cmap->green;
 688                 blue = cmap->blue;
 689                 transp = cmap->transp;
 690                 start = cmap->start;
 691
 692                 for (j = 0; j < cmap->len; j++) {
 693                         u16 hred, hgreen, hblue, htransp = 0xffff;
 694
 695                         hred = *red++;
 696                         hgreen = *green++;
 697                         hblue = *blue++;
 698
 699                         if (transp)
 700                                 htransp = *transp++;
 701
 702                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 703                         if (rc)
 704                                 goto out;
 705                 }
 706                 if (crtc_funcs->load_lut)
 707                         crtc_funcs->load_lut(crtc);
 708         }
 709  out:
 710         drm_modeset_unlock_all(dev);
 711         return rc;
 712 }
 713 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 714
 715 /**
 716  * drm_fb_helper_check_var - implementation for ->fb_check_var
 717  * @var: screeninfo to check
 718  * @info: fbdev registered by the helper
 719  */
 720 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 721                             struct fb_info *info)
 722 {
 723         struct drm_fb_helper *fb_helper = info->par;
 724         struct drm_framebuffer *fb = fb_helper->fb;
 725         int depth;
 726
 727         if (var->pixclock != 0 || in_dbg_master())
 728                 return -EINVAL;
 729
 730         /* Need to resize the fb object !!! */
 731         if (var->bits_per_pixel > fb->bits_per_pixel ||
 732             var->xres > fb->width || var->yres > fb->height ||
 733             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 734                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 735                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 736                           var->xres, var->yres, var->bits_per_pixel,
 737                           var->xres_virtual, var->yres_virtual,
 738                           fb->width, fb->height, fb->bits_per_pixel);
 739                 return -EINVAL;
 740         }
 741
 742         switch (var->bits_per_pixel) {
 743         case 16:
 744                 depth = (var->green.length == 6) ? 16 : 15;
 745                 break;
 746         case 32:
 747                 depth = (var->transp.length > 0) ? 32 : 24;
 748                 break;
 749         default:
 750                 depth = var->bits_per_pixel;
 751                 break;
 752         }
 753
 754         switch (depth) {
 755         case 8:
 756                 var->red.offset = 0;
 757                 var->green.offset = 0;
 758                 var->blue.offset = 0;
 759                 var->red.length = 8;
 760                 var->green.length = 8;
 761                 var->blue.length = 8;
 762                 var->transp.length = 0;
 763                 var->transp.offset = 0;
 764                 break;
 765         case 15:
 766                 var->red.offset = 10;
 767                 var->green.offset = 5;
 768                 var->blue.offset = 0;
 769                 var->red.length = 5;
 770                 var->green.length = 5;
 771                 var->blue.length = 5;
 772                 var->transp.length = 1;
 773                 var->transp.offset = 15;
 774                 break;
 775         case 16:
 776                 var->red.offset = 11;
 777                 var->green.offset = 5;
 778                 var->blue.offset = 0;
 779                 var->red.length = 5;
 780                 var->green.length = 6;
 781                 var->blue.length = 5;
 782                 var->transp.length = 0;
 783                 var->transp.offset = 0;
 784                 break;
 785         case 24:
 786                 var->red.offset = 16;
 787                 var->green.offset = 8;
 788                 var->blue.offset = 0;
 789                 var->red.length = 8;
 790                 var->green.length = 8;
 791                 var->blue.length = 8;
 792                 var->transp.length = 0;
 793                 var->transp.offset = 0;
 794                 break;
 795         case 32:
 796                 var->red.offset = 16;
 797                 var->green.offset = 8;
 798                 var->blue.offset = 0;
 799                 var->red.length = 8;
 800                 var->green.length = 8;
 801                 var->blue.length = 8;
 802                 var->transp.length = 8;
 803                 var->transp.offset = 24;
 804                 break;
 805         default:
 806                 return -EINVAL;
 807         }
 808         return 0;
 809 }
 810 EXPORT_SYMBOL(drm_fb_helper_check_var);
 811
 812 /**
 813  * drm_fb_helper_set_par - implementation for ->fb_set_par
 814  * @info: fbdev registered by the helper
 815  *
 816  * This will let fbcon do the mode init and is called at initialization time by
 817  * the fbdev core when registering the driver, and later on through the hotplug
 818  * callback.
 819  */
 820 int drm_fb_helper_set_par(struct fb_info *info)
 821 {
 822         struct drm_fb_helper *fb_helper = info->par;
 823         struct drm_device *dev = fb_helper->dev;
 824         struct fb_var_screeninfo *var = &info->var;
 825
 826         if (var->pixclock != 0) {
 827                 DRM_ERROR("PIXEL CLOCK SET\n");
 828                 return -EINVAL;
 829         }
 830
 831         drm_modeset_lock_all(dev);
 832         drm_fb_helper_restore_fbdev_mode(fb_helper);
 833         drm_modeset_unlock_all(dev);
 834
 835         if (fb_helper->delayed_hotplug) {
 836                 fb_helper->delayed_hotplug = false;
 837                 drm_fb_helper_hotplug_event(fb_helper);
 838         }
 839         return 0;
 840 }
 841 EXPORT_SYMBOL(drm_fb_helper_set_par);
 842
 843 /**
 844  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 845  * @var: updated screen information
 846  * @info: fbdev registered by the helper
 847  */
 848 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 849                               struct fb_info *info)
 850 {
 851         struct drm_fb_helper *fb_helper = info->par;
 852         struct drm_device *dev = fb_helper->dev;
 853         struct drm_mode_set *modeset;
 854         int ret = 0;
 855         int i;
 856
 857         drm_modeset_lock_all(dev);
 858         if (!drm_fb_helper_is_bound(fb_helper)) {
 859                 drm_modeset_unlock_all(dev);
 860                 return -EBUSY;
 861         }
 862
 863         for (i = 0; i < fb_helper->crtc_count; i++) {
 864                 modeset = &fb_helper->crtc_info[i].mode_set;
 865
 866                 modeset->x = var->xoffset;
 867                 modeset->y = var->yoffset;
 868
 869                 if (modeset->num_connectors) {
 870                         ret = drm_mode_set_config_internal(modeset);
 871                         if (!ret) {
 872                                 info->var.xoffset = var->xoffset;
 873                                 info->var.yoffset = var->yoffset;
 874                         }
 875                 }
 876         }
 877         drm_modeset_unlock_all(dev);
 878         return ret;
 879 }
 880 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 881
 882 /*
 883  * Allocates the backing storage and sets up the fbdev info structure through
 884  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 885  * notifier.
 886  */
 887 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 888                                          int preferred_bpp)
 889 {
 890         int ret = 0;
 891         int crtc_count = 0;
 892         int i;
 893         struct fb_info *info;
 894         struct drm_fb_helper_surface_size sizes;
 895         int gamma_size = 0;
 896
 897         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 898         sizes.surface_depth = 24;
 899         sizes.surface_bpp = 32;
 900         sizes.fb_width = (unsigned)-1;
 901         sizes.fb_height = (unsigned)-1;
 902
 903         /* if driver picks 8 or 16 by default use that
 904            for both depth/bpp */
 905         if (preferred_bpp != sizes.surface_bpp)
 906                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 907
 908         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 909         for (i = 0; i < fb_helper->connector_count; i++) {
 910                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 911                 struct drm_cmdline_mode *cmdline_mode;
 912
 913                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 914
 915                 if (cmdline_mode->bpp_specified) {
 916                         switch (cmdline_mode->bpp) {
 917                         case 8:
 918                                 sizes.surface_depth = sizes.surface_bpp = 8;
 919                                 break;
 920                         case 15:
 921                                 sizes.surface_depth = 15;
 922                                 sizes.surface_bpp = 16;
 923                                 break;
 924                         case 16:
 925                                 sizes.surface_depth = sizes.surface_bpp = 16;
 926                                 break;
 927                         case 24:
 928                                 sizes.surface_depth = sizes.surface_bpp = 24;
 929                                 break;
 930                         case 32:
 931                                 sizes.surface_depth = 24;
 932                                 sizes.surface_bpp = 32;
 933                                 break;
 934                         }
 935                         break;
 936                 }
 937         }
 938
 939         crtc_count = 0;
 940         for (i = 0; i < fb_helper->crtc_count; i++) {
 941                 struct drm_display_mode *desired_mode;
 942                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 943
 944                 if (desired_mode) {
 945                         if (gamma_size == 0)
 946                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 947                         if (desired_mode->hdisplay < sizes.fb_width)
 948                                 sizes.fb_width = desired_mode->hdisplay;
 949                         if (desired_mode->vdisplay < sizes.fb_height)
 950                                 sizes.fb_height = desired_mode->vdisplay;
 951                         if (desired_mode->hdisplay > sizes.surface_width)
 952                                 sizes.surface_width = desired_mode->hdisplay;
 953                         if (desired_mode->vdisplay > sizes.surface_height)
 954                                 sizes.surface_height = desired_mode->vdisplay;
 955                         crtc_count++;
 956                 }
 957         }
 958
 959         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 960                 /* hmm everyone went away - assume VGA cable just fell out
 961                    and will come back later. */
 962                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 963                 sizes.fb_width = sizes.surface_width = 1024;
 964                 sizes.fb_height = sizes.surface_height = 768;
 965         }
 966
 967         /* push down into drivers */
 968         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 969         if (ret < 0)
 970                 return ret;
 971
 972         info = fb_helper->fbdev;
 973
 974         /*
 975          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
 976          * events, but at init time drm_setup_crtcs needs to be called before
 977          * the fb is allocated (since we need to figure out the desired size of
 978          * the fb before we can allocate it ...). Hence we need to fix things up
 979          * here again.
 980          */
 981         for (i = 0; i < fb_helper->crtc_count; i++)
 982                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
 983                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 984
 985
 986         info->var.pixclock = 0;
 987         if (register_framebuffer(info) < 0)
 988                 return -EINVAL;
 989
 990         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 991                         info->node, info->fix.id);
 992
 993         /* Switch back to kernel console on panic */
 994         /* multi card linked list maybe */
 995         if (list_empty(&kernel_fb_helper_list)) {
 996                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
 997                 atomic_notifier_chain_register(&panic_notifier_list,
 998                                                &paniced);
 999                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1000         }
1001
1002         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1003
1004         return 0;
1005 }
1006
1007 /**
1008  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1009  * @info: fbdev registered by the helper
1010  * @pitch: desired pitch
1011  * @depth: desired depth
1012  *
1013  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1014  * fbdev emulations. Drivers which support acceleration methods which impose
1015  * additional constraints need to set up their own limits.
1016  *
1017  * Drivers should call this (or their equivalent setup code) from their
1018  * ->fb_probe callback.
1019  */
1020 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1021                             uint32_t depth)
1022 {
1023         info->fix.type = FB_TYPE_PACKED_PIXELS;
1024         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1025                 FB_VISUAL_TRUECOLOR;
1026         info->fix.mmio_start = 0;
1027         info->fix.mmio_len = 0;
1028         info->fix.type_aux = 0;
1029         info->fix.xpanstep = 1; /* doing it in hw */
1030         info->fix.ypanstep = 1; /* doing it in hw */
1031         info->fix.ywrapstep = 0;
1032         info->fix.accel = FB_ACCEL_NONE;
1033         info->fix.type_aux = 0;
1034
1035         info->fix.line_length = pitch;
1036         return;
1037 }
1038 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1039
1040 /**
1041  * drm_fb_helper_fill_var - initalizes variable fbdev information
1042  * @info: fbdev instance to set up
1043  * @fb_helper: fb helper instance to use as template
1044  * @fb_width: desired fb width
1045  * @fb_height: desired fb height
1046  *
1047  * Sets up the variable fbdev metainformation from the given fb helper instance
1048  * and the drm framebuffer allocated in fb_helper->fb.
1049  *
1050  * Drivers should call this (or their equivalent setup code) from their
1051  * ->fb_probe callback after having allocated the fbdev backing
1052  * storage framebuffer.
1053  */
1054 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1055                             uint32_t fb_width, uint32_t fb_height)
1056 {
1057         struct drm_framebuffer *fb = fb_helper->fb;
1058         info->pseudo_palette = fb_helper->pseudo_palette;
1059         info->var.xres_virtual = fb->width;
1060         info->var.yres_virtual = fb->height;
1061         info->var.bits_per_pixel = fb->bits_per_pixel;
1062         info->var.accel_flags = FB_ACCELF_TEXT;
1063         info->var.xoffset = 0;
1064         info->var.yoffset = 0;
1065         info->var.activate = FB_ACTIVATE_NOW;
1066         info->var.height = -1;
1067         info->var.width = -1;
1068
1069         switch (fb->depth) {
1070         case 8:
1071                 info->var.red.offset = 0;
1072                 info->var.green.offset = 0;
1073                 info->var.blue.offset = 0;
1074                 info->var.red.length = 8; /* 8bit DAC */
1075                 info->var.green.length = 8;
1076                 info->var.blue.length = 8;
1077                 info->var.transp.offset = 0;
1078                 info->var.transp.length = 0;
1079                 break;
1080         case 15:
1081                 info->var.red.offset = 10;
1082                 info->var.green.offset = 5;
1083                 info->var.blue.offset = 0;
1084                 info->var.red.length = 5;
1085                 info->var.green.length = 5;
1086                 info->var.blue.length = 5;
1087                 info->var.transp.offset = 15;
1088                 info->var.transp.length = 1;
1089                 break;
1090         case 16:
1091                 info->var.red.offset = 11;
1092                 info->var.green.offset = 5;
1093                 info->var.blue.offset = 0;
1094                 info->var.red.length = 5;
1095                 info->var.green.length = 6;
1096                 info->var.blue.length = 5;
1097                 info->var.transp.offset = 0;
1098                 break;
1099         case 24:
1100                 info->var.red.offset = 16;
1101                 info->var.green.offset = 8;
1102                 info->var.blue.offset = 0;
1103                 info->var.red.length = 8;
1104                 info->var.green.length = 8;
1105                 info->var.blue.length = 8;
1106                 info->var.transp.offset = 0;
1107                 info->var.transp.length = 0;
1108                 break;
1109         case 32:
1110                 info->var.red.offset = 16;
1111                 info->var.green.offset = 8;
1112                 info->var.blue.offset = 0;
1113                 info->var.red.length = 8;
1114                 info->var.green.length = 8;
1115                 info->var.blue.length = 8;
1116                 info->var.transp.offset = 24;
1117                 info->var.transp.length = 8;
1118                 break;
1119         default:
1120                 break;
1121         }
1122
1123         info->var.xres = fb_width;
1124         info->var.yres = fb_height;
1125 }
1126 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1127
1128 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1129                                                uint32_t maxX,
1130                                                uint32_t maxY)
1131 {
1132         struct drm_connector *connector;
1133         int count = 0;
1134         int i;
1135
1136         for (i = 0; i < fb_helper->connector_count; i++) {
1137                 connector = fb_helper->connector_info[i]->connector;
1138                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1139         }
1140
1141         return count;
1142 }
1143
1144 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1145 {
1146         struct drm_display_mode *mode;
1147
1148         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1149                 if (mode->hdisplay > width ||
1150                     mode->vdisplay > height)
1151                         continue;
1152                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1153                         return mode;
1154         }
1155         return NULL;
1156 }
1157 EXPORT_SYMBOL(drm_has_preferred_mode);
1158
1159 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1160 {
1161         struct drm_cmdline_mode *cmdline_mode;
1162         cmdline_mode = &fb_connector->cmdline_mode;
1163         return cmdline_mode->specified;
1164 }
1165
1166 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1167                                                       int width, int height)
1168 {
1169         struct drm_cmdline_mode *cmdline_mode;
1170         struct drm_display_mode *mode = NULL;
1171         bool prefer_non_interlace;
1172
1173         cmdline_mode = &fb_helper_conn->cmdline_mode;
1174         if (cmdline_mode->specified == false)
1175                 return mode;
1176
1177         /* attempt to find a matching mode in the list of modes
1178          *  we have gotten so far, if not add a CVT mode that conforms
1179          */
1180         if (cmdline_mode->rb || cmdline_mode->margins)
1181                 goto create_mode;
1182
1183         prefer_non_interlace = !cmdline_mode->interlace;
1184  again:
1185         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1186                 /* check width/height */
1187                 if (mode->hdisplay != cmdline_mode->xres ||
1188                     mode->vdisplay != cmdline_mode->yres)
1189                         continue;
1190
1191                 if (cmdline_mode->refresh_specified) {
1192                         if (mode->vrefresh != cmdline_mode->refresh)
1193                                 continue;
1194                 }
1195
1196                 if (cmdline_mode->interlace) {
1197                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1198                                 continue;
1199                 } else if (prefer_non_interlace) {
1200                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1201                                 continue;
1202                 }
1203                 return mode;
1204         }
1205
1206         if (prefer_non_interlace) {
1207                 prefer_non_interlace = false;
1208                 goto again;
1209         }
1210
1211 create_mode:
1212         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1213                                                  cmdline_mode);
1214         list_add(&mode->head, &fb_helper_conn->connector->modes);
1215         return mode;
1216 }
1217 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1218
1219 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1220 {
1221         bool enable;
1222
1223         if (strict)
1224                 enable = connector->status == connector_status_connected;
1225         else
1226                 enable = connector->status != connector_status_disconnected;
1227
1228         return enable;
1229 }
1230
1231 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1232                                   bool *enabled)
1233 {
1234         bool any_enabled = false;
1235         struct drm_connector *connector;
1236         int i = 0;
1237
1238         for (i = 0; i < fb_helper->connector_count; i++) {
1239                 connector = fb_helper->connector_info[i]->connector;
1240                 enabled[i] = drm_connector_enabled(connector, true);
1241                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1242                           enabled[i] ? "yes" : "no");
1243                 any_enabled |= enabled[i];
1244         }
1245
1246         if (any_enabled)
1247                 return;
1248
1249         for (i = 0; i < fb_helper->connector_count; i++) {
1250                 connector = fb_helper->connector_info[i]->connector;
1251                 enabled[i] = drm_connector_enabled(connector, false);
1252         }
1253 }
1254
1255 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1256                               struct drm_display_mode **modes,
1257                               bool *enabled, int width, int height)
1258 {
1259         int count, i, j;
1260         bool can_clone = false;
1261         struct drm_fb_helper_connector *fb_helper_conn;
1262         struct drm_display_mode *dmt_mode, *mode;
1263
1264         /* only contemplate cloning in the single crtc case */
1265         if (fb_helper->crtc_count > 1)
1266                 return false;
1267
1268         count = 0;
1269         for (i = 0; i < fb_helper->connector_count; i++) {
1270                 if (enabled[i])
1271                         count++;
1272         }
1273
1274         /* only contemplate cloning if more than one connector is enabled */
1275         if (count <= 1)
1276                 return false;
1277
1278         /* check the command line or if nothing common pick 1024x768 */
1279         can_clone = true;
1280         for (i = 0; i < fb_helper->connector_count; i++) {
1281                 if (!enabled[i])
1282                         continue;
1283                 fb_helper_conn = fb_helper->connector_info[i];
1284                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1285                 if (!modes[i]) {
1286                         can_clone = false;
1287                         break;
1288                 }
1289                 for (j = 0; j < i; j++) {
1290                         if (!enabled[j])
1291                                 continue;
1292                         if (!drm_mode_equal(modes[j], modes[i]))
1293                                 can_clone = false;
1294                 }
1295         }
1296
1297         if (can_clone) {
1298                 DRM_DEBUG_KMS("can clone using command line\n");
1299                 return true;
1300         }
1301
1302         /* try and find a 1024x768 mode on each connector */
1303         can_clone = true;
1304         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1305
1306         for (i = 0; i < fb_helper->connector_count; i++) {
1307
1308                 if (!enabled[i])
1309                         continue;
1310
1311                 fb_helper_conn = fb_helper->connector_info[i];
1312                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1313                         if (drm_mode_equal(mode, dmt_mode))
1314                                 modes[i] = mode;
1315                 }
1316                 if (!modes[i])
1317                         can_clone = false;
1318         }
1319
1320         if (can_clone) {
1321                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1322                 return true;
1323         }
1324         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1325         return false;
1326 }
1327
1328 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1329                                  struct drm_display_mode **modes,
1330                                  bool *enabled, int width, int height)
1331 {
1332         struct drm_fb_helper_connector *fb_helper_conn;
1333         int i;
1334
1335         for (i = 0; i < fb_helper->connector_count; i++) {
1336                 fb_helper_conn = fb_helper->connector_info[i];
1337
1338                 if (enabled[i] == false)
1339                         continue;
1340
1341                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1342                               fb_helper_conn->connector->base.id);
1343
1344                 /* got for command line mode first */
1345                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1346                 if (!modes[i]) {
1347                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1348                                       fb_helper_conn->connector->base.id);
1349                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1350                 }
1351                 /* No preferred modes, pick one off the list */
1352                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1353                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1354                                 break;
1355                 }
1356                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1357                           "none");
1358         }
1359         return true;
1360 }
1361
1362 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1363                           struct drm_fb_helper_crtc **best_crtcs,
1364                           struct drm_display_mode **modes,
1365                           int n, int width, int height)
1366 {
1367         int c, o;
1368         struct drm_device *dev = fb_helper->dev;
1369         struct drm_connector *connector;
1370         struct drm_connector_helper_funcs *connector_funcs;
1371         struct drm_encoder *encoder;
1372         int my_score, best_score, score;
1373         struct drm_fb_helper_crtc **crtcs, *crtc;
1374         struct drm_fb_helper_connector *fb_helper_conn;
1375
1376         if (n == fb_helper->connector_count)
1377                 return 0;
1378
1379         fb_helper_conn = fb_helper->connector_info[n];
1380         connector = fb_helper_conn->connector;
1381
1382         best_crtcs[n] = NULL;
1383         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1384         if (modes[n] == NULL)
1385                 return best_score;
1386
1387         crtcs = kzalloc(dev->mode_config.num_connector *
1388                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1389         if (!crtcs)
1390                 return best_score;
1391
1392         my_score = 1;
1393         if (connector->status == connector_status_connected)
1394                 my_score++;
1395         if (drm_has_cmdline_mode(fb_helper_conn))
1396                 my_score++;
1397         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1398                 my_score++;
1399
1400         connector_funcs = connector->helper_private;
1401         encoder = connector_funcs->best_encoder(connector);
1402         if (!encoder)
1403                 goto out;
1404
1405         /* select a crtc for this connector and then attempt to configure
1406            remaining connectors */
1407         for (c = 0; c < fb_helper->crtc_count; c++) {
1408                 crtc = &fb_helper->crtc_info[c];
1409
1410                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1411                         continue;
1412
1413                 for (o = 0; o < n; o++)
1414                         if (best_crtcs[o] == crtc)
1415                                 break;
1416
1417                 if (o < n) {
1418                         /* ignore cloning unless only a single crtc */
1419                         if (fb_helper->crtc_count > 1)
1420                                 continue;
1421
1422                         if (!drm_mode_equal(modes[o], modes[n]))
1423                                 continue;
1424                 }
1425
1426                 crtcs[n] = crtc;
1427                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1428                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1429                                                   width, height);
1430                 if (score > best_score) {
1431                         best_score = score;
1432                         memcpy(best_crtcs, crtcs,
1433                                dev->mode_config.num_connector *
1434                                sizeof(struct drm_fb_helper_crtc *));
1435                 }
1436         }
1437 out:
1438         kfree(crtcs);
1439         return best_score;
1440 }
1441
1442 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1443 {
1444         struct drm_device *dev = fb_helper->dev;
1445         struct drm_fb_helper_crtc **crtcs;
1446         struct drm_display_mode **modes;
1447         struct drm_mode_set *modeset;
1448         bool *enabled;
1449         int width, height;
1450         int i;
1451
1452         DRM_DEBUG_KMS("\n");
1453
1454         width = dev->mode_config.max_width;
1455         height = dev->mode_config.max_height;
1456
1457         crtcs = kcalloc(dev->mode_config.num_connector,
1458                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1459         modes = kcalloc(dev->mode_config.num_connector,
1460                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1461         enabled = kcalloc(dev->mode_config.num_connector,
1462                           sizeof(bool), GFP_KERNEL);
1463         if (!crtcs || !modes || !enabled) {
1464                 DRM_ERROR("Memory allocation failed\n");
1465                 goto out;
1466         }
1467
1468
1469         drm_enable_connectors(fb_helper, enabled);
1470
1471         if (!(fb_helper->funcs->initial_config &&
1472               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1473                                                enabled, width, height))) {
1474                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1475                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1476
1477                 if (!drm_target_cloned(fb_helper,
1478                                        modes, enabled, width, height) &&
1479                     !drm_target_preferred(fb_helper,
1480                                           modes, enabled, width, height))
1481                         DRM_ERROR("Unable to find initial modes\n");
1482
1483                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1484                               width, height);
1485
1486                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1487         }
1488
1489         /* need to set the modesets up here for use later */
1490         /* fill out the connector<->crtc mappings into the modesets */
1491         for (i = 0; i < fb_helper->crtc_count; i++) {
1492                 modeset = &fb_helper->crtc_info[i].mode_set;
1493                 modeset->num_connectors = 0;
1494                 modeset->fb = NULL;
1495         }
1496
1497         for (i = 0; i < fb_helper->connector_count; i++) {
1498                 struct drm_display_mode *mode = modes[i];
1499                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1500                 modeset = &fb_crtc->mode_set;
1501
1502                 if (mode && fb_crtc) {
1503                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1504                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1505                         fb_crtc->desired_mode = mode;
1506                         if (modeset->mode)
1507                                 drm_mode_destroy(dev, modeset->mode);
1508                         modeset->mode = drm_mode_duplicate(dev,
1509                                                            fb_crtc->desired_mode);
1510                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1511                         modeset->fb = fb_helper->fb;
1512                 }
1513         }
1514
1515         /* Clear out any old modes if there are no more connected outputs. */
1516         for (i = 0; i < fb_helper->crtc_count; i++) {
1517                 modeset = &fb_helper->crtc_info[i].mode_set;
1518                 if (modeset->num_connectors == 0) {
1519                         BUG_ON(modeset->fb);
1520                         BUG_ON(modeset->num_connectors);
1521                         if (modeset->mode)
1522                                 drm_mode_destroy(dev, modeset->mode);
1523                         modeset->mode = NULL;
1524                 }
1525         }
1526 out:
1527         kfree(crtcs);
1528         kfree(modes);
1529         kfree(enabled);
1530 }
1531
1532 /**
1533  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1534  * @fb_helper: fb_helper device struct
1535  * @bpp_sel: bpp value to use for the framebuffer configuration
1536  *
1537  * Scans the CRTCs and connectors and tries to put together an initial setup.
1538  * At the moment, this is a cloned configuration across all heads with
1539  * a new framebuffer object as the backing store.
1540  *
1541  * Note that this also registers the fbdev and so allows userspace to call into
1542  * the driver through the fbdev interfaces.
1543  *
1544  * This function will call down into the ->fb_probe callback to let
1545  * the driver allocate and initialize the fbdev info structure and the drm
1546  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1547  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1548  * values for the fbdev info structure.
1549  *
1550  * RETURNS:
1551  * Zero if everything went ok, nonzero otherwise.
1552  */
1553 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1554 {
1555         struct drm_device *dev = fb_helper->dev;
1556         int count = 0;
1557
1558         drm_fb_helper_parse_command_line(fb_helper);
1559
1560         mutex_lock(&dev->mode_config.mutex);
1561         count = drm_fb_helper_probe_connector_modes(fb_helper,
1562                                                     dev->mode_config.max_width,
1563                                                     dev->mode_config.max_height);
1564         mutex_unlock(&dev->mode_config.mutex);
1565         /*
1566          * we shouldn't end up with no modes here.
1567          */
1568         if (count == 0)
1569                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1570
1571         drm_setup_crtcs(fb_helper);
1572
1573         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1574 }
1575 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1576
1577 /**
1578  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1579  *                               probing all the outputs attached to the fb
1580  * @fb_helper: the drm_fb_helper
1581  *
1582  * Scan the connectors attached to the fb_helper and try to put together a
1583  * setup after *notification of a change in output configuration.
1584  *
1585  * Called at runtime, takes the mode config locks to be able to check/change the
1586  * modeset configuration. Must be run from process context (which usually means
1587  * either the output polling work or a work item launched from the driver's
1588  * hotplug interrupt).
1589  *
1590  * Note that the driver must ensure that this is only called _after_ the fb has
1591  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1592  *
1593  * RETURNS:
1594  * 0 on success and a non-zero error code otherwise.
1595  */
1596 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1597 {
1598         struct drm_device *dev = fb_helper->dev;
1599         u32 max_width, max_height;
1600
1601         if (!fb_helper->fb)
1602                 return 0;
1603
1604         mutex_lock(&fb_helper->dev->mode_config.mutex);
1605         if (!drm_fb_helper_is_bound(fb_helper)) {
1606                 fb_helper->delayed_hotplug = true;
1607                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1608                 return 0;
1609         }
1610         DRM_DEBUG_KMS("\n");
1611
1612         max_width = fb_helper->fb->width;
1613         max_height = fb_helper->fb->height;
1614
1615         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1616         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1617
1618         drm_modeset_lock_all(dev);
1619         drm_setup_crtcs(fb_helper);
1620         drm_modeset_unlock_all(dev);
1621         drm_fb_helper_set_par(fb_helper->fbdev);
1622
1623         return 0;
1624 }
1625 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1626
1627 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1628  * but the module doesn't depend on any fb console symbols.  At least
1629  * attempt to load fbcon to avoid leaving the system without a usable console.
1630  */
1631 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1632 static int __init drm_fb_helper_modinit(void)
1633 {
1634         const char *name = "fbcon";
1635         struct module *fbcon;
1636
1637         mutex_lock(&module_mutex);
1638         fbcon = find_module(name);
1639         mutex_unlock(&module_mutex);
1640
1641         if (!fbcon)
1642                 request_module_nowait(name);
1643         return 0;
1644 }
1645
1646 module_init(drm_fb_helper_modinit);
1647 #endif