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 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 277 {
 278         struct drm_device *dev = fb_helper->dev;
 279         struct drm_plane *plane;
 280         bool error = false;
 281         int i;
 282
 283         drm_warn_on_modeset_not_all_locked(dev);
 284
 285         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 286                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 287                         drm_plane_force_disable(plane);
 288
 289         for (i = 0; i < fb_helper->crtc_count; i++) {
 290                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 291                 struct drm_crtc *crtc = mode_set->crtc;
 292                 int ret;
 293
 294                 if (crtc->funcs->cursor_set) {
 295                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 296                         if (ret)
 297                                 error = true;
 298                 }
 299
 300                 ret = drm_mode_set_config_internal(mode_set);
 301                 if (ret)
 302                         error = true;
 303         }
 304         return error;
 305 }
 306 /**
 307  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 308  * @fb_helper: fbcon to restore
 309  *
 310  * This should be called from driver's drm ->lastclose callback
 311  * when implementing an fbcon on top of kms using this helper. This ensures that
 312  * the user isn't greeted with a black screen when e.g. X dies.
 313  *
 314  * Use this variant if you need to bypass locking (panic), or already
 315  * hold all modeset locks.  Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
 316  */
 317 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 318 {
 319         return restore_fbdev_mode(fb_helper);
 320 }
 321
 322 /**
 323  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 324  * @fb_helper: fbcon to restore
 325  *
 326  * This should be called from driver's drm ->lastclose callback
 327  * when implementing an fbcon on top of kms using this helper. This ensures that
 328  * the user isn't greeted with a black screen when e.g. X dies.
 329  */
 330 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 331 {
 332         struct drm_device *dev = fb_helper->dev;
 333         bool ret;
 334         drm_modeset_lock_all(dev);
 335         ret = restore_fbdev_mode(fb_helper);
 336         drm_modeset_unlock_all(dev);
 337         return ret;
 338 }
 339 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 340
 341 /*
 342  * restore fbcon display for all kms driver's using this helper, used for sysrq
 343  * and panic handling.
 344  */
 345 static bool drm_fb_helper_force_kernel_mode(void)
 346 {
 347         bool ret, error = false;
 348         struct drm_fb_helper *helper;
 349
 350         if (list_empty(&kernel_fb_helper_list))
 351                 return false;
 352
 353         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 354                 struct drm_device *dev = helper->dev;
 355
 356                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 357                         continue;
 358
 359                 /* NOTE: we use lockless flag below to avoid grabbing other
 360                  * modeset locks.  So just trylock the underlying mutex
 361                  * directly:
 362                  */
 363                 if (!mutex_trylock(&dev->mode_config.mutex)) {
 364                         error = true;
 365                         continue;
 366                 }
 367
 368                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 369                 if (ret)
 370                         error = true;
 371
 372                 mutex_unlock(&dev->mode_config.mutex);
 373         }
 374         return error;
 375 }
 376
 377 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 378                         void *panic_str)
 379 {
 380         /*
 381          * It's a waste of time and effort to switch back to text console
 382          * if the kernel should reboot before panic messages can be seen.
 383          */
 384         if (panic_timeout < 0)
 385                 return 0;
 386
 387         pr_err("panic occurred, switching back to text console\n");
 388         return drm_fb_helper_force_kernel_mode();
 389 }
 390
 391 static struct notifier_block paniced = {
 392         .notifier_call = drm_fb_helper_panic,
 393 };
 394
 395 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 396 {
 397         struct drm_device *dev = fb_helper->dev;
 398         struct drm_crtc *crtc;
 399         int bound = 0, crtcs_bound = 0;
 400
 401         /* Sometimes user space wants everything disabled, so don't steal the
 402          * display if there's a master. */
 403         if (dev->primary->master)
 404                 return false;
 405
 406         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 407                 if (crtc->primary->fb)
 408                         crtcs_bound++;
 409                 if (crtc->primary->fb == fb_helper->fb)
 410                         bound++;
 411         }
 412
 413         if (bound < crtcs_bound)
 414                 return false;
 415
 416         return true;
 417 }
 418
 419 #ifdef CONFIG_MAGIC_SYSRQ
 420 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 421 {
 422         bool ret;
 423         ret = drm_fb_helper_force_kernel_mode();
 424         if (ret == true)
 425                 DRM_ERROR("Failed to restore crtc configuration\n");
 426 }
 427 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 428
 429 static void drm_fb_helper_sysrq(int dummy1)
 430 {
 431         schedule_work(&drm_fb_helper_restore_work);
 432 }
 433
 434 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 435         .handler = drm_fb_helper_sysrq,
 436         .help_msg = "force-fb(V)",
 437         .action_msg = "Restore framebuffer console",
 438 };
 439 #else
 440 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 441 #endif
 442
 443 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 444 {
 445         struct drm_fb_helper *fb_helper = info->par;
 446         struct drm_device *dev = fb_helper->dev;
 447         struct drm_crtc *crtc;
 448         struct drm_connector *connector;
 449         int i, j;
 450
 451         /*
 452          * fbdev->blank can be called from irq context in case of a panic.
 453          * Since we already have our own special panic handler which will
 454          * restore the fbdev console mode completely, just bail out early.
 455          */
 456         if (oops_in_progress)
 457                 return;
 458
 459         /*
 460          * For each CRTC in this fb, turn the connectors on/off.
 461          */
 462         drm_modeset_lock_all(dev);
 463         if (!drm_fb_helper_is_bound(fb_helper)) {
 464                 drm_modeset_unlock_all(dev);
 465                 return;
 466         }
 467
 468         for (i = 0; i < fb_helper->crtc_count; i++) {
 469                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 470
 471                 if (!crtc->enabled)
 472                         continue;
 473
 474                 /* Walk the connectors & encoders on this fb turning them on/off */
 475                 for (j = 0; j < fb_helper->connector_count; j++) {
 476                         connector = fb_helper->connector_info[j]->connector;
 477                         connector->funcs->dpms(connector, dpms_mode);
 478                         drm_object_property_set_value(&connector->base,
 479                                 dev->mode_config.dpms_property, dpms_mode);
 480                 }
 481         }
 482         drm_modeset_unlock_all(dev);
 483 }
 484
 485 /**
 486  * drm_fb_helper_blank - implementation for ->fb_blank
 487  * @blank: desired blanking state
 488  * @info: fbdev registered by the helper
 489  */
 490 int drm_fb_helper_blank(int blank, struct fb_info *info)
 491 {
 492         switch (blank) {
 493         /* Display: On; HSync: On, VSync: On */
 494         case FB_BLANK_UNBLANK:
 495                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 496                 break;
 497         /* Display: Off; HSync: On, VSync: On */
 498         case FB_BLANK_NORMAL:
 499                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 500                 break;
 501         /* Display: Off; HSync: Off, VSync: On */
 502         case FB_BLANK_HSYNC_SUSPEND:
 503                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 504                 break;
 505         /* Display: Off; HSync: On, VSync: Off */
 506         case FB_BLANK_VSYNC_SUSPEND:
 507                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 508                 break;
 509         /* Display: Off; HSync: Off, VSync: Off */
 510         case FB_BLANK_POWERDOWN:
 511                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 512                 break;
 513         }
 514         return 0;
 515 }
 516 EXPORT_SYMBOL(drm_fb_helper_blank);
 517
 518 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 519 {
 520         int i;
 521
 522         for (i = 0; i < helper->connector_count; i++)
 523                 kfree(helper->connector_info[i]);
 524         kfree(helper->connector_info);
 525         for (i = 0; i < helper->crtc_count; i++) {
 526                 kfree(helper->crtc_info[i].mode_set.connectors);
 527                 if (helper->crtc_info[i].mode_set.mode)
 528                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 529         }
 530         kfree(helper->crtc_info);
 531 }
 532
 533 /**
 534  * drm_fb_helper_init - initialize a drm_fb_helper structure
 535  * @dev: drm device
 536  * @fb_helper: driver-allocated fbdev helper structure to initialize
 537  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 538  * @max_conn_count: max connector count
 539  *
 540  * This allocates the structures for the fbdev helper with the given limits.
 541  * Note that this won't yet touch the hardware (through the driver interfaces)
 542  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 543  * to allow driver writes more control over the exact init sequence.
 544  *
 545  * Drivers must set fb_helper->funcs before calling
 546  * drm_fb_helper_initial_config().
 547  *
 548  * RETURNS:
 549  * Zero if everything went ok, nonzero otherwise.
 550  */
 551 int drm_fb_helper_init(struct drm_device *dev,
 552                        struct drm_fb_helper *fb_helper,
 553                        int crtc_count, int max_conn_count)
 554 {
 555         struct drm_crtc *crtc;
 556         int i;
 557
 558         if (!max_conn_count)
 559                 return -EINVAL;
 560
 561         fb_helper->dev = dev;
 562
 563         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 564
 565         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 566         if (!fb_helper->crtc_info)
 567                 return -ENOMEM;
 568
 569         fb_helper->crtc_count = crtc_count;
 570         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 571         if (!fb_helper->connector_info) {
 572                 kfree(fb_helper->crtc_info);
 573                 return -ENOMEM;
 574         }
 575         fb_helper->connector_count = 0;
 576
 577         for (i = 0; i < crtc_count; i++) {
 578                 fb_helper->crtc_info[i].mode_set.connectors =
 579                         kcalloc(max_conn_count,
 580                                 sizeof(struct drm_connector *),
 581                                 GFP_KERNEL);
 582
 583                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 584                         goto out_free;
 585                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 586         }
 587
 588         i = 0;
 589         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 590                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 591                 i++;
 592         }
 593
 594         return 0;
 595 out_free:
 596         drm_fb_helper_crtc_free(fb_helper);
 597         return -ENOMEM;
 598 }
 599 EXPORT_SYMBOL(drm_fb_helper_init);
 600
 601 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 602 {
 603         if (!list_empty(&fb_helper->kernel_fb_list)) {
 604                 list_del(&fb_helper->kernel_fb_list);
 605                 if (list_empty(&kernel_fb_helper_list)) {
 606                         pr_info("drm: unregistered panic notifier\n");
 607                         atomic_notifier_chain_unregister(&panic_notifier_list,
 608                                                          &paniced);
 609                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 610                 }
 611         }
 612
 613         drm_fb_helper_crtc_free(fb_helper);
 614
 615 }
 616 EXPORT_SYMBOL(drm_fb_helper_fini);
 617
 618 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 619                      u16 blue, u16 regno, struct fb_info *info)
 620 {
 621         struct drm_fb_helper *fb_helper = info->par;
 622         struct drm_framebuffer *fb = fb_helper->fb;
 623         int pindex;
 624
 625         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 626                 u32 *palette;
 627                 u32 value;
 628                 /* place color in psuedopalette */
 629                 if (regno > 16)
 630                         return -EINVAL;
 631                 palette = (u32 *)info->pseudo_palette;
 632                 red >>= (16 - info->var.red.length);
 633                 green >>= (16 - info->var.green.length);
 634                 blue >>= (16 - info->var.blue.length);
 635                 value = (red << info->var.red.offset) |
 636                         (green << info->var.green.offset) |
 637                         (blue << info->var.blue.offset);
 638                 if (info->var.transp.length > 0) {
 639                         u32 mask = (1 << info->var.transp.length) - 1;
 640                         mask <<= info->var.transp.offset;
 641                         value |= mask;
 642                 }
 643                 palette[regno] = value;
 644                 return 0;
 645         }
 646
 647         /*
 648          * The driver really shouldn't advertise pseudo/directcolor
 649          * visuals if it can't deal with the palette.
 650          */
 651         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 652                     !fb_helper->funcs->gamma_get))
 653                 return -EINVAL;
 654
 655         pindex = regno;
 656
 657         if (fb->bits_per_pixel == 16) {
 658                 pindex = regno << 3;
 659
 660                 if (fb->depth == 16 && regno > 63)
 661                         return -EINVAL;
 662                 if (fb->depth == 15 && regno > 31)
 663                         return -EINVAL;
 664
 665                 if (fb->depth == 16) {
 666                         u16 r, g, b;
 667                         int i;
 668                         if (regno < 32) {
 669                                 for (i = 0; i < 8; i++)
 670                                         fb_helper->funcs->gamma_set(crtc, red,
 671                                                 green, blue, pindex + i);
 672                         }
 673
 674                         fb_helper->funcs->gamma_get(crtc, &r,
 675                                                     &g, &b,
 676                                                     pindex >> 1);
 677
 678                         for (i = 0; i < 4; i++)
 679                                 fb_helper->funcs->gamma_set(crtc, r,
 680                                                             green, b,
 681                                                             (pindex >> 1) + i);
 682                 }
 683         }
 684
 685         if (fb->depth != 16)
 686                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 687         return 0;
 688 }
 689
 690 /**
 691  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 692  * @cmap: cmap to set
 693  * @info: fbdev registered by the helper
 694  */
 695 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 696 {
 697         struct drm_fb_helper *fb_helper = info->par;
 698         struct drm_device *dev = fb_helper->dev;
 699         struct drm_crtc_helper_funcs *crtc_funcs;
 700         u16 *red, *green, *blue, *transp;
 701         struct drm_crtc *crtc;
 702         int i, j, rc = 0;
 703         int start;
 704
 705         drm_modeset_lock_all(dev);
 706         if (!drm_fb_helper_is_bound(fb_helper)) {
 707                 drm_modeset_unlock_all(dev);
 708                 return -EBUSY;
 709         }
 710
 711         for (i = 0; i < fb_helper->crtc_count; i++) {
 712                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 713                 crtc_funcs = crtc->helper_private;
 714
 715                 red = cmap->red;
 716                 green = cmap->green;
 717                 blue = cmap->blue;
 718                 transp = cmap->transp;
 719                 start = cmap->start;
 720
 721                 for (j = 0; j < cmap->len; j++) {
 722                         u16 hred, hgreen, hblue, htransp = 0xffff;
 723
 724                         hred = *red++;
 725                         hgreen = *green++;
 726                         hblue = *blue++;
 727
 728                         if (transp)
 729                                 htransp = *transp++;
 730
 731                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 732                         if (rc)
 733                                 goto out;
 734                 }
 735                 if (crtc_funcs->load_lut)
 736                         crtc_funcs->load_lut(crtc);
 737         }
 738  out:
 739         drm_modeset_unlock_all(dev);
 740         return rc;
 741 }
 742 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 743
 744 /**
 745  * drm_fb_helper_check_var - implementation for ->fb_check_var
 746  * @var: screeninfo to check
 747  * @info: fbdev registered by the helper
 748  */
 749 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 750                             struct fb_info *info)
 751 {
 752         struct drm_fb_helper *fb_helper = info->par;
 753         struct drm_framebuffer *fb = fb_helper->fb;
 754         int depth;
 755
 756         if (var->pixclock != 0 || in_dbg_master())
 757                 return -EINVAL;
 758
 759         /* Need to resize the fb object !!! */
 760         if (var->bits_per_pixel > fb->bits_per_pixel ||
 761             var->xres > fb->width || var->yres > fb->height ||
 762             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 763                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 764                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 765                           var->xres, var->yres, var->bits_per_pixel,
 766                           var->xres_virtual, var->yres_virtual,
 767                           fb->width, fb->height, fb->bits_per_pixel);
 768                 return -EINVAL;
 769         }
 770
 771         switch (var->bits_per_pixel) {
 772         case 16:
 773                 depth = (var->green.length == 6) ? 16 : 15;
 774                 break;
 775         case 32:
 776                 depth = (var->transp.length > 0) ? 32 : 24;
 777                 break;
 778         default:
 779                 depth = var->bits_per_pixel;
 780                 break;
 781         }
 782
 783         switch (depth) {
 784         case 8:
 785                 var->red.offset = 0;
 786                 var->green.offset = 0;
 787                 var->blue.offset = 0;
 788                 var->red.length = 8;
 789                 var->green.length = 8;
 790                 var->blue.length = 8;
 791                 var->transp.length = 0;
 792                 var->transp.offset = 0;
 793                 break;
 794         case 15:
 795                 var->red.offset = 10;
 796                 var->green.offset = 5;
 797                 var->blue.offset = 0;
 798                 var->red.length = 5;
 799                 var->green.length = 5;
 800                 var->blue.length = 5;
 801                 var->transp.length = 1;
 802                 var->transp.offset = 15;
 803                 break;
 804         case 16:
 805                 var->red.offset = 11;
 806                 var->green.offset = 5;
 807                 var->blue.offset = 0;
 808                 var->red.length = 5;
 809                 var->green.length = 6;
 810                 var->blue.length = 5;
 811                 var->transp.length = 0;
 812                 var->transp.offset = 0;
 813                 break;
 814         case 24:
 815                 var->red.offset = 16;
 816                 var->green.offset = 8;
 817                 var->blue.offset = 0;
 818                 var->red.length = 8;
 819                 var->green.length = 8;
 820                 var->blue.length = 8;
 821                 var->transp.length = 0;
 822                 var->transp.offset = 0;
 823                 break;
 824         case 32:
 825                 var->red.offset = 16;
 826                 var->green.offset = 8;
 827                 var->blue.offset = 0;
 828                 var->red.length = 8;
 829                 var->green.length = 8;
 830                 var->blue.length = 8;
 831                 var->transp.length = 8;
 832                 var->transp.offset = 24;
 833                 break;
 834         default:
 835                 return -EINVAL;
 836         }
 837         return 0;
 838 }
 839 EXPORT_SYMBOL(drm_fb_helper_check_var);
 840
 841 /**
 842  * drm_fb_helper_set_par - implementation for ->fb_set_par
 843  * @info: fbdev registered by the helper
 844  *
 845  * This will let fbcon do the mode init and is called at initialization time by
 846  * the fbdev core when registering the driver, and later on through the hotplug
 847  * callback.
 848  */
 849 int drm_fb_helper_set_par(struct fb_info *info)
 850 {
 851         struct drm_fb_helper *fb_helper = info->par;
 852         struct fb_var_screeninfo *var = &info->var;
 853
 854         if (var->pixclock != 0) {
 855                 DRM_ERROR("PIXEL CLOCK SET\n");
 856                 return -EINVAL;
 857         }
 858
 859         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 860
 861         if (fb_helper->delayed_hotplug) {
 862                 fb_helper->delayed_hotplug = false;
 863                 drm_fb_helper_hotplug_event(fb_helper);
 864         }
 865         return 0;
 866 }
 867 EXPORT_SYMBOL(drm_fb_helper_set_par);
 868
 869 /**
 870  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 871  * @var: updated screen information
 872  * @info: fbdev registered by the helper
 873  */
 874 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 875                               struct fb_info *info)
 876 {
 877         struct drm_fb_helper *fb_helper = info->par;
 878         struct drm_device *dev = fb_helper->dev;
 879         struct drm_mode_set *modeset;
 880         int ret = 0;
 881         int i;
 882
 883         drm_modeset_lock_all(dev);
 884         if (!drm_fb_helper_is_bound(fb_helper)) {
 885                 drm_modeset_unlock_all(dev);
 886                 return -EBUSY;
 887         }
 888
 889         for (i = 0; i < fb_helper->crtc_count; i++) {
 890                 modeset = &fb_helper->crtc_info[i].mode_set;
 891
 892                 modeset->x = var->xoffset;
 893                 modeset->y = var->yoffset;
 894
 895                 if (modeset->num_connectors) {
 896                         ret = drm_mode_set_config_internal(modeset);
 897                         if (!ret) {
 898                                 info->var.xoffset = var->xoffset;
 899                                 info->var.yoffset = var->yoffset;
 900                         }
 901                 }
 902         }
 903         drm_modeset_unlock_all(dev);
 904         return ret;
 905 }
 906 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 907
 908 /*
 909  * Allocates the backing storage and sets up the fbdev info structure through
 910  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 911  * notifier.
 912  */
 913 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 914                                          int preferred_bpp)
 915 {
 916         int ret = 0;
 917         int crtc_count = 0;
 918         int i;
 919         struct fb_info *info;
 920         struct drm_fb_helper_surface_size sizes;
 921         int gamma_size = 0;
 922
 923         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 924         sizes.surface_depth = 24;
 925         sizes.surface_bpp = 32;
 926         sizes.fb_width = (unsigned)-1;
 927         sizes.fb_height = (unsigned)-1;
 928
 929         /* if driver picks 8 or 16 by default use that
 930            for both depth/bpp */
 931         if (preferred_bpp != sizes.surface_bpp)
 932                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 933
 934         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 935         for (i = 0; i < fb_helper->connector_count; i++) {
 936                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 937                 struct drm_cmdline_mode *cmdline_mode;
 938
 939                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 940
 941                 if (cmdline_mode->bpp_specified) {
 942                         switch (cmdline_mode->bpp) {
 943                         case 8:
 944                                 sizes.surface_depth = sizes.surface_bpp = 8;
 945                                 break;
 946                         case 15:
 947                                 sizes.surface_depth = 15;
 948                                 sizes.surface_bpp = 16;
 949                                 break;
 950                         case 16:
 951                                 sizes.surface_depth = sizes.surface_bpp = 16;
 952                                 break;
 953                         case 24:
 954                                 sizes.surface_depth = sizes.surface_bpp = 24;
 955                                 break;
 956                         case 32:
 957                                 sizes.surface_depth = 24;
 958                                 sizes.surface_bpp = 32;
 959                                 break;
 960                         }
 961                         break;
 962                 }
 963         }
 964
 965         crtc_count = 0;
 966         for (i = 0; i < fb_helper->crtc_count; i++) {
 967                 struct drm_display_mode *desired_mode;
 968                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 969
 970                 if (desired_mode) {
 971                         if (gamma_size == 0)
 972                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 973                         if (desired_mode->hdisplay < sizes.fb_width)
 974                                 sizes.fb_width = desired_mode->hdisplay;
 975                         if (desired_mode->vdisplay < sizes.fb_height)
 976                                 sizes.fb_height = desired_mode->vdisplay;
 977                         if (desired_mode->hdisplay > sizes.surface_width)
 978                                 sizes.surface_width = desired_mode->hdisplay;
 979                         if (desired_mode->vdisplay > sizes.surface_height)
 980                                 sizes.surface_height = desired_mode->vdisplay;
 981                         crtc_count++;
 982                 }
 983         }
 984
 985         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 986                 /* hmm everyone went away - assume VGA cable just fell out
 987                    and will come back later. */
 988                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 989                 sizes.fb_width = sizes.surface_width = 1024;
 990                 sizes.fb_height = sizes.surface_height = 768;
 991         }
 992
 993         /* push down into drivers */
 994         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 995         if (ret < 0)
 996                 return ret;
 997
 998         info = fb_helper->fbdev;
 999
1000         /*
1001          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1002          * events, but at init time drm_setup_crtcs needs to be called before
1003          * the fb is allocated (since we need to figure out the desired size of
1004          * the fb before we can allocate it ...). Hence we need to fix things up
1005          * here again.
1006          */
1007         for (i = 0; i < fb_helper->crtc_count; i++)
1008                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1009                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1010
1011
1012         info->var.pixclock = 0;
1013         if (register_framebuffer(info) < 0)
1014                 return -EINVAL;
1015
1016         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1017                         info->node, info->fix.id);
1018
1019         /* Switch back to kernel console on panic */
1020         /* multi card linked list maybe */
1021         if (list_empty(&kernel_fb_helper_list)) {
1022                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1023                 atomic_notifier_chain_register(&panic_notifier_list,
1024                                                &paniced);
1025                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1026         }
1027
1028         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1029
1030         return 0;
1031 }
1032
1033 /**
1034  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1035  * @info: fbdev registered by the helper
1036  * @pitch: desired pitch
1037  * @depth: desired depth
1038  *
1039  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1040  * fbdev emulations. Drivers which support acceleration methods which impose
1041  * additional constraints need to set up their own limits.
1042  *
1043  * Drivers should call this (or their equivalent setup code) from their
1044  * ->fb_probe callback.
1045  */
1046 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1047                             uint32_t depth)
1048 {
1049         info->fix.type = FB_TYPE_PACKED_PIXELS;
1050         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1051                 FB_VISUAL_TRUECOLOR;
1052         info->fix.mmio_start = 0;
1053         info->fix.mmio_len = 0;
1054         info->fix.type_aux = 0;
1055         info->fix.xpanstep = 1; /* doing it in hw */
1056         info->fix.ypanstep = 1; /* doing it in hw */
1057         info->fix.ywrapstep = 0;
1058         info->fix.accel = FB_ACCEL_NONE;
1059         info->fix.type_aux = 0;
1060
1061         info->fix.line_length = pitch;
1062         return;
1063 }
1064 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1065
1066 /**
1067  * drm_fb_helper_fill_var - initalizes variable fbdev information
1068  * @info: fbdev instance to set up
1069  * @fb_helper: fb helper instance to use as template
1070  * @fb_width: desired fb width
1071  * @fb_height: desired fb height
1072  *
1073  * Sets up the variable fbdev metainformation from the given fb helper instance
1074  * and the drm framebuffer allocated in fb_helper->fb.
1075  *
1076  * Drivers should call this (or their equivalent setup code) from their
1077  * ->fb_probe callback after having allocated the fbdev backing
1078  * storage framebuffer.
1079  */
1080 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1081                             uint32_t fb_width, uint32_t fb_height)
1082 {
1083         struct drm_framebuffer *fb = fb_helper->fb;
1084         info->pseudo_palette = fb_helper->pseudo_palette;
1085         info->var.xres_virtual = fb->width;
1086         info->var.yres_virtual = fb->height;
1087         info->var.bits_per_pixel = fb->bits_per_pixel;
1088         info->var.accel_flags = FB_ACCELF_TEXT;
1089         info->var.xoffset = 0;
1090         info->var.yoffset = 0;
1091         info->var.activate = FB_ACTIVATE_NOW;
1092         info->var.height = -1;
1093         info->var.width = -1;
1094
1095         switch (fb->depth) {
1096         case 8:
1097                 info->var.red.offset = 0;
1098                 info->var.green.offset = 0;
1099                 info->var.blue.offset = 0;
1100                 info->var.red.length = 8; /* 8bit DAC */
1101                 info->var.green.length = 8;
1102                 info->var.blue.length = 8;
1103                 info->var.transp.offset = 0;
1104                 info->var.transp.length = 0;
1105                 break;
1106         case 15:
1107                 info->var.red.offset = 10;
1108                 info->var.green.offset = 5;
1109                 info->var.blue.offset = 0;
1110                 info->var.red.length = 5;
1111                 info->var.green.length = 5;
1112                 info->var.blue.length = 5;
1113                 info->var.transp.offset = 15;
1114                 info->var.transp.length = 1;
1115                 break;
1116         case 16:
1117                 info->var.red.offset = 11;
1118                 info->var.green.offset = 5;
1119                 info->var.blue.offset = 0;
1120                 info->var.red.length = 5;
1121                 info->var.green.length = 6;
1122                 info->var.blue.length = 5;
1123                 info->var.transp.offset = 0;
1124                 break;
1125         case 24:
1126                 info->var.red.offset = 16;
1127                 info->var.green.offset = 8;
1128                 info->var.blue.offset = 0;
1129                 info->var.red.length = 8;
1130                 info->var.green.length = 8;
1131                 info->var.blue.length = 8;
1132                 info->var.transp.offset = 0;
1133                 info->var.transp.length = 0;
1134                 break;
1135         case 32:
1136                 info->var.red.offset = 16;
1137                 info->var.green.offset = 8;
1138                 info->var.blue.offset = 0;
1139                 info->var.red.length = 8;
1140                 info->var.green.length = 8;
1141                 info->var.blue.length = 8;
1142                 info->var.transp.offset = 24;
1143                 info->var.transp.length = 8;
1144                 break;
1145         default:
1146                 break;
1147         }
1148
1149         info->var.xres = fb_width;
1150         info->var.yres = fb_height;
1151 }
1152 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1153
1154 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1155                                                uint32_t maxX,
1156                                                uint32_t maxY)
1157 {
1158         struct drm_connector *connector;
1159         int count = 0;
1160         int i;
1161
1162         for (i = 0; i < fb_helper->connector_count; i++) {
1163                 connector = fb_helper->connector_info[i]->connector;
1164                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1165         }
1166
1167         return count;
1168 }
1169
1170 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1171 {
1172         struct drm_display_mode *mode;
1173
1174         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1175                 if (mode->hdisplay > width ||
1176                     mode->vdisplay > height)
1177                         continue;
1178                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1179                         return mode;
1180         }
1181         return NULL;
1182 }
1183 EXPORT_SYMBOL(drm_has_preferred_mode);
1184
1185 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1186 {
1187         struct drm_cmdline_mode *cmdline_mode;
1188         cmdline_mode = &fb_connector->cmdline_mode;
1189         return cmdline_mode->specified;
1190 }
1191
1192 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1193                                                       int width, int height)
1194 {
1195         struct drm_cmdline_mode *cmdline_mode;
1196         struct drm_display_mode *mode = NULL;
1197         bool prefer_non_interlace;
1198
1199         cmdline_mode = &fb_helper_conn->cmdline_mode;
1200         if (cmdline_mode->specified == false)
1201                 return mode;
1202
1203         /* attempt to find a matching mode in the list of modes
1204          *  we have gotten so far, if not add a CVT mode that conforms
1205          */
1206         if (cmdline_mode->rb || cmdline_mode->margins)
1207                 goto create_mode;
1208
1209         prefer_non_interlace = !cmdline_mode->interlace;
1210  again:
1211         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1212                 /* check width/height */
1213                 if (mode->hdisplay != cmdline_mode->xres ||
1214                     mode->vdisplay != cmdline_mode->yres)
1215                         continue;
1216
1217                 if (cmdline_mode->refresh_specified) {
1218                         if (mode->vrefresh != cmdline_mode->refresh)
1219                                 continue;
1220                 }
1221
1222                 if (cmdline_mode->interlace) {
1223                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1224                                 continue;
1225                 } else if (prefer_non_interlace) {
1226                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1227                                 continue;
1228                 }
1229                 return mode;
1230         }
1231
1232         if (prefer_non_interlace) {
1233                 prefer_non_interlace = false;
1234                 goto again;
1235         }
1236
1237 create_mode:
1238         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1239                                                  cmdline_mode);
1240         list_add(&mode->head, &fb_helper_conn->connector->modes);
1241         return mode;
1242 }
1243 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1244
1245 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1246 {
1247         bool enable;
1248
1249         if (strict)
1250                 enable = connector->status == connector_status_connected;
1251         else
1252                 enable = connector->status != connector_status_disconnected;
1253
1254         return enable;
1255 }
1256
1257 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1258                                   bool *enabled)
1259 {
1260         bool any_enabled = false;
1261         struct drm_connector *connector;
1262         int i = 0;
1263
1264         for (i = 0; i < fb_helper->connector_count; i++) {
1265                 connector = fb_helper->connector_info[i]->connector;
1266                 enabled[i] = drm_connector_enabled(connector, true);
1267                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1268                           enabled[i] ? "yes" : "no");
1269                 any_enabled |= enabled[i];
1270         }
1271
1272         if (any_enabled)
1273                 return;
1274
1275         for (i = 0; i < fb_helper->connector_count; i++) {
1276                 connector = fb_helper->connector_info[i]->connector;
1277                 enabled[i] = drm_connector_enabled(connector, false);
1278         }
1279 }
1280
1281 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1282                               struct drm_display_mode **modes,
1283                               bool *enabled, int width, int height)
1284 {
1285         int count, i, j;
1286         bool can_clone = false;
1287         struct drm_fb_helper_connector *fb_helper_conn;
1288         struct drm_display_mode *dmt_mode, *mode;
1289
1290         /* only contemplate cloning in the single crtc case */
1291         if (fb_helper->crtc_count > 1)
1292                 return false;
1293
1294         count = 0;
1295         for (i = 0; i < fb_helper->connector_count; i++) {
1296                 if (enabled[i])
1297                         count++;
1298         }
1299
1300         /* only contemplate cloning if more than one connector is enabled */
1301         if (count <= 1)
1302                 return false;
1303
1304         /* check the command line or if nothing common pick 1024x768 */
1305         can_clone = true;
1306         for (i = 0; i < fb_helper->connector_count; i++) {
1307                 if (!enabled[i])
1308                         continue;
1309                 fb_helper_conn = fb_helper->connector_info[i];
1310                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1311                 if (!modes[i]) {
1312                         can_clone = false;
1313                         break;
1314                 }
1315                 for (j = 0; j < i; j++) {
1316                         if (!enabled[j])
1317                                 continue;
1318                         if (!drm_mode_equal(modes[j], modes[i]))
1319                                 can_clone = false;
1320                 }
1321         }
1322
1323         if (can_clone) {
1324                 DRM_DEBUG_KMS("can clone using command line\n");
1325                 return true;
1326         }
1327
1328         /* try and find a 1024x768 mode on each connector */
1329         can_clone = true;
1330         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1331
1332         for (i = 0; i < fb_helper->connector_count; i++) {
1333
1334                 if (!enabled[i])
1335                         continue;
1336
1337                 fb_helper_conn = fb_helper->connector_info[i];
1338                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1339                         if (drm_mode_equal(mode, dmt_mode))
1340                                 modes[i] = mode;
1341                 }
1342                 if (!modes[i])
1343                         can_clone = false;
1344         }
1345
1346         if (can_clone) {
1347                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1348                 return true;
1349         }
1350         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1351         return false;
1352 }
1353
1354 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1355                                  struct drm_display_mode **modes,
1356                                  bool *enabled, int width, int height)
1357 {
1358         struct drm_fb_helper_connector *fb_helper_conn;
1359         int i;
1360
1361         for (i = 0; i < fb_helper->connector_count; i++) {
1362                 fb_helper_conn = fb_helper->connector_info[i];
1363
1364                 if (enabled[i] == false)
1365                         continue;
1366
1367                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1368                               fb_helper_conn->connector->base.id);
1369
1370                 /* got for command line mode first */
1371                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1372                 if (!modes[i]) {
1373                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1374                                       fb_helper_conn->connector->base.id);
1375                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1376                 }
1377                 /* No preferred modes, pick one off the list */
1378                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1379                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1380                                 break;
1381                 }
1382                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1383                           "none");
1384         }
1385         return true;
1386 }
1387
1388 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1389                           struct drm_fb_helper_crtc **best_crtcs,
1390                           struct drm_display_mode **modes,
1391                           int n, int width, int height)
1392 {
1393         int c, o;
1394         struct drm_device *dev = fb_helper->dev;
1395         struct drm_connector *connector;
1396         struct drm_connector_helper_funcs *connector_funcs;
1397         struct drm_encoder *encoder;
1398         int my_score, best_score, score;
1399         struct drm_fb_helper_crtc **crtcs, *crtc;
1400         struct drm_fb_helper_connector *fb_helper_conn;
1401
1402         if (n == fb_helper->connector_count)
1403                 return 0;
1404
1405         fb_helper_conn = fb_helper->connector_info[n];
1406         connector = fb_helper_conn->connector;
1407
1408         best_crtcs[n] = NULL;
1409         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1410         if (modes[n] == NULL)
1411                 return best_score;
1412
1413         crtcs = kzalloc(dev->mode_config.num_connector *
1414                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1415         if (!crtcs)
1416                 return best_score;
1417
1418         my_score = 1;
1419         if (connector->status == connector_status_connected)
1420                 my_score++;
1421         if (drm_has_cmdline_mode(fb_helper_conn))
1422                 my_score++;
1423         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1424                 my_score++;
1425
1426         connector_funcs = connector->helper_private;
1427         encoder = connector_funcs->best_encoder(connector);
1428         if (!encoder)
1429                 goto out;
1430
1431         /* select a crtc for this connector and then attempt to configure
1432            remaining connectors */
1433         for (c = 0; c < fb_helper->crtc_count; c++) {
1434                 crtc = &fb_helper->crtc_info[c];
1435
1436                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1437                         continue;
1438
1439                 for (o = 0; o < n; o++)
1440                         if (best_crtcs[o] == crtc)
1441                                 break;
1442
1443                 if (o < n) {
1444                         /* ignore cloning unless only a single crtc */
1445                         if (fb_helper->crtc_count > 1)
1446                                 continue;
1447
1448                         if (!drm_mode_equal(modes[o], modes[n]))
1449                                 continue;
1450                 }
1451
1452                 crtcs[n] = crtc;
1453                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1454                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1455                                                   width, height);
1456                 if (score > best_score) {
1457                         best_score = score;
1458                         memcpy(best_crtcs, crtcs,
1459                                dev->mode_config.num_connector *
1460                                sizeof(struct drm_fb_helper_crtc *));
1461                 }
1462         }
1463 out:
1464         kfree(crtcs);
1465         return best_score;
1466 }
1467
1468 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1469 {
1470         struct drm_device *dev = fb_helper->dev;
1471         struct drm_fb_helper_crtc **crtcs;
1472         struct drm_display_mode **modes;
1473         struct drm_mode_set *modeset;
1474         bool *enabled;
1475         int width, height;
1476         int i;
1477
1478         DRM_DEBUG_KMS("\n");
1479
1480         width = dev->mode_config.max_width;
1481         height = dev->mode_config.max_height;
1482
1483         crtcs = kcalloc(dev->mode_config.num_connector,
1484                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1485         modes = kcalloc(dev->mode_config.num_connector,
1486                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1487         enabled = kcalloc(dev->mode_config.num_connector,
1488                           sizeof(bool), GFP_KERNEL);
1489         if (!crtcs || !modes || !enabled) {
1490                 DRM_ERROR("Memory allocation failed\n");
1491                 goto out;
1492         }
1493
1494
1495         drm_enable_connectors(fb_helper, enabled);
1496
1497         if (!(fb_helper->funcs->initial_config &&
1498               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1499                                                enabled, width, height))) {
1500                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1501                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1502
1503                 if (!drm_target_cloned(fb_helper,
1504                                        modes, enabled, width, height) &&
1505                     !drm_target_preferred(fb_helper,
1506                                           modes, enabled, width, height))
1507                         DRM_ERROR("Unable to find initial modes\n");
1508
1509                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1510                               width, height);
1511
1512                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1513         }
1514
1515         /* need to set the modesets up here for use later */
1516         /* fill out the connector<->crtc mappings into the modesets */
1517         for (i = 0; i < fb_helper->crtc_count; i++) {
1518                 modeset = &fb_helper->crtc_info[i].mode_set;
1519                 modeset->num_connectors = 0;
1520                 modeset->fb = NULL;
1521         }
1522
1523         for (i = 0; i < fb_helper->connector_count; i++) {
1524                 struct drm_display_mode *mode = modes[i];
1525                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1526                 modeset = &fb_crtc->mode_set;
1527
1528                 if (mode && fb_crtc) {
1529                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1530                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1531                         fb_crtc->desired_mode = mode;
1532                         if (modeset->mode)
1533                                 drm_mode_destroy(dev, modeset->mode);
1534                         modeset->mode = drm_mode_duplicate(dev,
1535                                                            fb_crtc->desired_mode);
1536                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1537                         modeset->fb = fb_helper->fb;
1538                 }
1539         }
1540
1541         /* Clear out any old modes if there are no more connected outputs. */
1542         for (i = 0; i < fb_helper->crtc_count; i++) {
1543                 modeset = &fb_helper->crtc_info[i].mode_set;
1544                 if (modeset->num_connectors == 0) {
1545                         BUG_ON(modeset->fb);
1546                         BUG_ON(modeset->num_connectors);
1547                         if (modeset->mode)
1548                                 drm_mode_destroy(dev, modeset->mode);
1549                         modeset->mode = NULL;
1550                 }
1551         }
1552 out:
1553         kfree(crtcs);
1554         kfree(modes);
1555         kfree(enabled);
1556 }
1557
1558 /**
1559  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1560  * @fb_helper: fb_helper device struct
1561  * @bpp_sel: bpp value to use for the framebuffer configuration
1562  *
1563  * Scans the CRTCs and connectors and tries to put together an initial setup.
1564  * At the moment, this is a cloned configuration across all heads with
1565  * a new framebuffer object as the backing store.
1566  *
1567  * Note that this also registers the fbdev and so allows userspace to call into
1568  * the driver through the fbdev interfaces.
1569  *
1570  * This function will call down into the ->fb_probe callback to let
1571  * the driver allocate and initialize the fbdev info structure and the drm
1572  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1573  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1574  * values for the fbdev info structure.
1575  *
1576  * RETURNS:
1577  * Zero if everything went ok, nonzero otherwise.
1578  */
1579 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1580 {
1581         struct drm_device *dev = fb_helper->dev;
1582         int count = 0;
1583
1584         drm_fb_helper_parse_command_line(fb_helper);
1585
1586         mutex_lock(&dev->mode_config.mutex);
1587         count = drm_fb_helper_probe_connector_modes(fb_helper,
1588                                                     dev->mode_config.max_width,
1589                                                     dev->mode_config.max_height);
1590         mutex_unlock(&dev->mode_config.mutex);
1591         /*
1592          * we shouldn't end up with no modes here.
1593          */
1594         if (count == 0)
1595                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1596
1597         drm_setup_crtcs(fb_helper);
1598
1599         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1600 }
1601 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1602
1603 /**
1604  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1605  *                               probing all the outputs attached to the fb
1606  * @fb_helper: the drm_fb_helper
1607  *
1608  * Scan the connectors attached to the fb_helper and try to put together a
1609  * setup after *notification of a change in output configuration.
1610  *
1611  * Called at runtime, takes the mode config locks to be able to check/change the
1612  * modeset configuration. Must be run from process context (which usually means
1613  * either the output polling work or a work item launched from the driver's
1614  * hotplug interrupt).
1615  *
1616  * Note that the driver must ensure that this is only called _after_ the fb has
1617  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1618  *
1619  * RETURNS:
1620  * 0 on success and a non-zero error code otherwise.
1621  */
1622 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1623 {
1624         struct drm_device *dev = fb_helper->dev;
1625         u32 max_width, max_height;
1626
1627         if (!fb_helper->fb)
1628                 return 0;
1629
1630         mutex_lock(&fb_helper->dev->mode_config.mutex);
1631         if (!drm_fb_helper_is_bound(fb_helper)) {
1632                 fb_helper->delayed_hotplug = true;
1633                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1634                 return 0;
1635         }
1636         DRM_DEBUG_KMS("\n");
1637
1638         max_width = fb_helper->fb->width;
1639         max_height = fb_helper->fb->height;
1640
1641         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1642         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1643
1644         drm_modeset_lock_all(dev);
1645         drm_setup_crtcs(fb_helper);
1646         drm_modeset_unlock_all(dev);
1647         drm_fb_helper_set_par(fb_helper->fbdev);
1648
1649         return 0;
1650 }
1651 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1652
1653 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1654  * but the module doesn't depend on any fb console symbols.  At least
1655  * attempt to load fbcon to avoid leaving the system without a usable console.
1656  */
1657 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1658 static int __init drm_fb_helper_modinit(void)
1659 {
1660         const char *name = "fbcon";
1661         struct module *fbcon;
1662
1663         mutex_lock(&module_mutex);
1664         fbcon = find_module(name);
1665         mutex_unlock(&module_mutex);
1666
1667         if (!fbcon)
1668                 request_module_nowait(name);
1669         return 0;
1670 }
1671
1672 module_init(drm_fb_helper_modinit);
1673 #endif