sys/dev/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
  31 #include <linux/kernel.h>
  32 #include <linux/fb.h>
  33 #include <linux/module.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_crtc.h>
  36 #include <drm/drm_fb_helper.h>
  37 #include <drm/drm_crtc_helper.h>
  38
  39 static LINUX_LIST_HEAD(kernel_fb_helper_list);
  40
  41 /**
  42  * DOC: fbdev helpers
  43  *
  44  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  45  * mode setting driver. They can be used mostly independently from the crtc
  46  * helper functions used by many drivers to implement the kernel mode setting
  47  * interfaces.
  48  *
  49  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  50  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  51  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  52  * default behaviour can override the third step with their own code.
  53  * Teardown is done with drm_fb_helper_fini().
  54  *
  55  * At runtime drivers should restore the fbdev console by calling
  56  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  57  * should also notify the fb helper code from updates to the output
  58  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  59  * integration with the output polling code in drm_crtc_helper.c the modeset
  60  * code provides a ->output_poll_changed callback.
  61  *
  62  * All other functions exported by the fb helper library can be used to
  63  * implement the fbdev driver interface by the driver.
  64  *
  65  * It is possible, though perhaps somewhat tricky, to implement race-free
  66  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  67  * helper must be called first to initialize the minimum required to make
  68  * hotplug detection work. Drivers also need to make sure to properly set up
  69  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  70  * it is safe to enable interrupts and start processing hotplug events. At the
  71  * same time, drivers should initialize all modeset objects such as CRTCs,
  72  * encoders and connectors. To finish up the fbdev helper initialization, the
  73  * drm_fb_helper_init() function is called. To probe for all attached displays
  74  * and set up an initial configuration using the detected hardware, drivers
  75  * should call drm_fb_helper_single_add_all_connectors() followed by
  76  * drm_fb_helper_initial_config().
  77  */
  78
  79 /**
  80  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  81  *                                             emulation helper
  82  * @fb_helper: fbdev initialized with drm_fb_helper_init
  83  *
  84  * This functions adds all the available connectors for use with the given
  85  * fb_helper. This is a separate step to allow drivers to freely assign
  86  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  87  * not adequate to be used for the fbcon.
  88  *
  89  * Since this is part of the initial setup before the fbdev is published, no
  90  * locking is required.
  91  */
  92 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  93 {
  94         struct drm_device *dev = fb_helper->dev;
  95         struct drm_connector *connector;
  96         int i;
  97
  98         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  99                 struct drm_fb_helper_connector *fb_helper_connector;
 100
 101                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 102                 if (!fb_helper_connector)
 103                         goto fail;
 104
 105                 fb_helper_connector->connector = connector;
 106                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 107         }
 108         return 0;
 109 fail:
 110         for (i = 0; i < fb_helper->connector_count; i++) {
 111                 kfree(fb_helper->connector_info[i]);
 112                 fb_helper->connector_info[i] = NULL;
 113         }
 114         fb_helper->connector_count = 0;
 115         return -ENOMEM;
 116 }
 117 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 118
 119 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 120 {
 121         struct drm_fb_helper_connector **temp;
 122         struct drm_fb_helper_connector *fb_helper_connector;
 123
 124         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 125         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 126                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), M_DRM, M_WAITOK);
 127                 if (!temp)
 128                         return -ENOMEM;
 129
 130                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 131                 fb_helper->connector_info = temp;
 132         }
 133
 134
 135         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 136         if (!fb_helper_connector)
 137                 return -ENOMEM;
 138
 139         fb_helper_connector->connector = connector;
 140         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 141         return 0;
 142 }
 143 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 144
 145 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 146                                        struct drm_connector *connector)
 147 {
 148         struct drm_fb_helper_connector *fb_helper_connector;
 149         int i, j;
 150
 151         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 152
 153         for (i = 0; i < fb_helper->connector_count; i++) {
 154                 if (fb_helper->connector_info[i]->connector == connector)
 155                         break;
 156         }
 157
 158         if (i == fb_helper->connector_count)
 159                 return -EINVAL;
 160         fb_helper_connector = fb_helper->connector_info[i];
 161
 162         for (j = i + 1; j < fb_helper->connector_count; j++) {
 163                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 164         }
 165         fb_helper->connector_count--;
 166         kfree(fb_helper_connector);
 167         return 0;
 168 }
 169 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 170
 171 #if 0
 172 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 173 {
 174         uint16_t *r_base, *g_base, *b_base;
 175         int i;
 176
 177         if (helper->funcs->gamma_get == NULL)
 178                 return;
 179
 180         r_base = crtc->gamma_store;
 181         g_base = r_base + crtc->gamma_size;
 182         b_base = g_base + crtc->gamma_size;
 183
 184         for (i = 0; i < crtc->gamma_size; i++)
 185                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 186 }
 187
 188 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 189 {
 190         uint16_t *r_base, *g_base, *b_base;
 191
 192         if (crtc->funcs->gamma_set == NULL)
 193                 return;
 194
 195         r_base = crtc->gamma_store;
 196         g_base = r_base + crtc->gamma_size;
 197         b_base = g_base + crtc->gamma_size;
 198
 199         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 200 }
 201
 202 /**
 203  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 204  * @info: fbdev registered by the helper
 205  */
 206 int drm_fb_helper_debug_enter(struct fb_info *info)
 207 {
 208         struct drm_fb_helper *helper = info->par;
 209         struct drm_crtc_helper_funcs *funcs;
 210         int i;
 211
 212         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 213                 for (i = 0; i < helper->crtc_count; i++) {
 214                         struct drm_mode_set *mode_set =
 215                                 &helper->crtc_info[i].mode_set;
 216
 217                         if (!mode_set->crtc->enabled)
 218                                 continue;
 219
 220                         funcs = mode_set->crtc->helper_private;
 221                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 222                         funcs->mode_set_base_atomic(mode_set->crtc,
 223                                                     mode_set->fb,
 224                                                     mode_set->x,
 225                                                     mode_set->y,
 226                                                     ENTER_ATOMIC_MODE_SET);
 227                 }
 228         }
 229
 230         return 0;
 231 }
 232 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 233
 234 /* Find the real fb for a given fb helper CRTC */
 235 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 236 {
 237         struct drm_device *dev = crtc->dev;
 238         struct drm_crtc *c;
 239
 240         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 241                 if (crtc->base.id == c->base.id)
 242                         return c->primary->fb;
 243         }
 244
 245         return NULL;
 246 }
 247
 248 /**
 249  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 250  * @info: fbdev registered by the helper
 251  */
 252 int drm_fb_helper_debug_leave(struct fb_info *info)
 253 {
 254         struct drm_fb_helper *helper = info->par;
 255         struct drm_crtc *crtc;
 256         struct drm_crtc_helper_funcs *funcs;
 257         struct drm_framebuffer *fb;
 258         int i;
 259
 260         for (i = 0; i < helper->crtc_count; i++) {
 261                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 262                 crtc = mode_set->crtc;
 263                 funcs = crtc->helper_private;
 264                 fb = drm_mode_config_fb(crtc);
 265
 266                 if (!crtc->enabled)
 267                         continue;
 268
 269                 if (!fb) {
 270                         DRM_ERROR("no fb to restore??\n");
 271                         continue;
 272                 }
 273
 274                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 275                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 276                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 277         }
 278
 279         return 0;
 280 }
 281 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 282 #endif
 283
 284 static bool 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                 if (dev->mode_config.rotation_property) {
 298                         drm_mode_plane_set_obj_prop(plane,
 299                                                     dev->mode_config.rotation_property,
 300                                                     BIT(DRM_ROTATE_0));
 301                 }
 302         }
 303
 304         for (i = 0; i < fb_helper->crtc_count; i++) {
 305                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 306                 struct drm_crtc *crtc = mode_set->crtc;
 307                 int ret;
 308
 309                 if (crtc->funcs->cursor_set) {
 310                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 311                         if (ret)
 312                                 error = true;
 313                 }
 314
 315                 ret = drm_mode_set_config_internal(mode_set);
 316                 if (ret)
 317                         error = true;
 318         }
 319         return error;
 320 }
 321 /**
 322  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 323  * @fb_helper: fbcon to restore
 324  *
 325  * This should be called from driver's drm ->lastclose callback
 326  * when implementing an fbcon on top of kms using this helper. This ensures that
 327  * the user isn't greeted with a black screen when e.g. X dies.
 328  *
 329  * Use this variant if you need to bypass locking (panic), or already
 330  * hold all modeset locks.  Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
 331  */
 332 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 333 {
 334         return restore_fbdev_mode(fb_helper);
 335 }
 336
 337 /**
 338  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 339  * @fb_helper: fbcon to restore
 340  *
 341  * This should be called from driver's drm ->lastclose callback
 342  * when implementing an fbcon on top of kms using this helper. This ensures that
 343  * the user isn't greeted with a black screen when e.g. X dies.
 344  */
 345 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 346 {
 347         struct drm_device *dev = fb_helper->dev;
 348         bool ret;
 349         drm_modeset_lock_all(dev);
 350         ret = restore_fbdev_mode(fb_helper);
 351         drm_modeset_unlock_all(dev);
 352         return ret;
 353 }
 354 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 355
 356 #if 0
 357 /*
 358  * restore fbcon display for all kms driver's using this helper, used for sysrq
 359  * and panic handling.
 360  */
 361 static bool drm_fb_helper_force_kernel_mode(void)
 362 {
 363         bool ret, error = false;
 364         struct drm_fb_helper *helper;
 365
 366         if (list_empty(&kernel_fb_helper_list))
 367                 return false;
 368
 369         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 370                 struct drm_device *dev = helper->dev;
 371
 372                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 373                         continue;
 374
 375                 /* NOTE: we use lockless flag below to avoid grabbing other
 376                  * modeset locks.  So just trylock the underlying mutex
 377                  * directly:
 378                  */
 379                 if (!mutex_trylock(&dev->mode_config.mutex)) {
 380                         error = true;
 381                         continue;
 382                 }
 383
 384                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 385                 if (ret)
 386                         error = true;
 387
 388                 mutex_unlock(&dev->mode_config.mutex);
 389         }
 390         return error;
 391 }
 392
 393 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 394                         void *panic_str)
 395 {
 396         /*
 397          * It's a waste of time and effort to switch back to text console
 398          * if the kernel should reboot before panic messages can be seen.
 399          */
 400         if (panic_timeout < 0)
 401                 return 0;
 402
 403         pr_err("panic occurred, switching back to text console\n");
 404         return drm_fb_helper_force_kernel_mode();
 405 }
 406
 407 static struct notifier_block paniced = {
 408         .notifier_call = drm_fb_helper_panic,
 409 };
 410 #endif
 411
 412 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 413 {
 414         struct drm_device *dev = fb_helper->dev;
 415         struct drm_crtc *crtc;
 416         int bound = 0, crtcs_bound = 0;
 417
 418 #if 0
 419         /* Sometimes user space wants everything disabled, so don't steal the
 420          * display if there's a master. */
 421         if (dev->primary->master)
 422                 return false;
 423 #endif
 424
 425         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 426                 if (crtc->primary->fb)
 427                         crtcs_bound++;
 428                 if (crtc->primary->fb == fb_helper->fb)
 429                         bound++;
 430         }
 431
 432         if (bound < crtcs_bound)
 433                 return false;
 434
 435         return true;
 436 }
 437
 438 #if 0
 439 #ifdef CONFIG_MAGIC_SYSRQ
 440 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 441 {
 442         bool ret;
 443         ret = drm_fb_helper_force_kernel_mode();
 444         if (ret == true)
 445                 DRM_ERROR("Failed to restore crtc configuration\n");
 446 }
 447 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 448
 449 static void drm_fb_helper_sysrq(int dummy1)
 450 {
 451         schedule_work(&drm_fb_helper_restore_work);
 452 }
 453
 454 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 455         .handler = drm_fb_helper_sysrq,
 456         .help_msg = "force-fb(V)",
 457         .action_msg = "Restore framebuffer console",
 458 };
 459 #else
 460 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 461 #endif
 462
 463 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 464 {
 465         struct drm_fb_helper *fb_helper = info->par;
 466         struct drm_device *dev = fb_helper->dev;
 467         struct drm_crtc *crtc;
 468         struct drm_connector *connector;
 469         int i, j;
 470
 471         /*
 472          * fbdev->blank can be called from irq context in case of a panic.
 473          * Since we already have our own special panic handler which will
 474          * restore the fbdev console mode completely, just bail out early.
 475          */
 476         if (oops_in_progress)
 477                 return;
 478
 479         /*
 480          * For each CRTC in this fb, turn the connectors on/off.
 481          */
 482         drm_modeset_lock_all(dev);
 483         if (!drm_fb_helper_is_bound(fb_helper)) {
 484                 drm_modeset_unlock_all(dev);
 485                 return;
 486         }
 487
 488         for (i = 0; i < fb_helper->crtc_count; i++) {
 489                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 490
 491                 if (!crtc->enabled)
 492                         continue;
 493
 494                 /* Walk the connectors & encoders on this fb turning them on/off */
 495                 for (j = 0; j < fb_helper->connector_count; j++) {
 496                         connector = fb_helper->connector_info[j]->connector;
 497                         connector->funcs->dpms(connector, dpms_mode);
 498                         drm_object_property_set_value(&connector->base,
 499                                 dev->mode_config.dpms_property, dpms_mode);
 500                 }
 501         }
 502         drm_modeset_unlock_all(dev);
 503 }
 504
 505 /**
 506  * drm_fb_helper_blank - implementation for ->fb_blank
 507  * @blank: desired blanking state
 508  * @info: fbdev registered by the helper
 509  */
 510 int drm_fb_helper_blank(int blank, struct fb_info *info)
 511 {
 512         switch (blank) {
 513         /* Display: On; HSync: On, VSync: On */
 514         case FB_BLANK_UNBLANK:
 515                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 516                 break;
 517         /* Display: Off; HSync: On, VSync: On */
 518         case FB_BLANK_NORMAL:
 519                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 520                 break;
 521         /* Display: Off; HSync: Off, VSync: On */
 522         case FB_BLANK_HSYNC_SUSPEND:
 523                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 524                 break;
 525         /* Display: Off; HSync: On, VSync: Off */
 526         case FB_BLANK_VSYNC_SUSPEND:
 527                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 528                 break;
 529         /* Display: Off; HSync: Off, VSync: Off */
 530         case FB_BLANK_POWERDOWN:
 531                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 532                 break;
 533         }
 534         return 0;
 535 }
 536 EXPORT_SYMBOL(drm_fb_helper_blank);
 537 #endif
 538
 539 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 540 {
 541         int i;
 542
 543         for (i = 0; i < helper->connector_count; i++)
 544                 kfree(helper->connector_info[i]);
 545         kfree(helper->connector_info);
 546         for (i = 0; i < helper->crtc_count; i++) {
 547                 kfree(helper->crtc_info[i].mode_set.connectors);
 548                 if (helper->crtc_info[i].mode_set.mode)
 549                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 550         }
 551         kfree(helper->crtc_info);
 552 }
 553
 554 /**
 555  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 556  * @dev: DRM device
 557  * @helper: driver-allocated fbdev helper structure to set up
 558  * @funcs: pointer to structure of functions associate with this helper
 559  *
 560  * Sets up the bare minimum to make the framebuffer helper usable. This is
 561  * useful to implement race-free initialization of the polling helpers.
 562  */
 563 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 564                            const struct drm_fb_helper_funcs *funcs)
 565 {
 566         INIT_LIST_HEAD(&helper->kernel_fb_list);
 567         helper->funcs = funcs;
 568         helper->dev = dev;
 569 }
 570 EXPORT_SYMBOL(drm_fb_helper_prepare);
 571
 572 /**
 573  * drm_fb_helper_init - initialize a drm_fb_helper structure
 574  * @dev: drm device
 575  * @fb_helper: driver-allocated fbdev helper structure to initialize
 576  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 577  * @max_conn_count: max connector count
 578  *
 579  * This allocates the structures for the fbdev helper with the given limits.
 580  * Note that this won't yet touch the hardware (through the driver interfaces)
 581  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 582  * to allow driver writes more control over the exact init sequence.
 583  *
 584  * Drivers must call drm_fb_helper_prepare() before calling this function.
 585  *
 586  * RETURNS:
 587  * Zero if everything went ok, nonzero otherwise.
 588  */
 589 int drm_fb_helper_init(struct drm_device *dev,
 590                        struct drm_fb_helper *fb_helper,
 591                        int crtc_count, int max_conn_count)
 592 {
 593         struct drm_crtc *crtc;
 594         int i;
 595
 596         if (!max_conn_count)
 597                 return -EINVAL;
 598
 599         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 600         if (!fb_helper->crtc_info)
 601                 return -ENOMEM;
 602
 603         fb_helper->crtc_count = crtc_count;
 604         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 605         if (!fb_helper->connector_info) {
 606                 kfree(fb_helper->crtc_info);
 607                 return -ENOMEM;
 608         }
 609         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 610         fb_helper->connector_count = 0;
 611
 612         for (i = 0; i < crtc_count; i++) {
 613                 fb_helper->crtc_info[i].mode_set.connectors =
 614                         kcalloc(max_conn_count,
 615                                 sizeof(struct drm_connector *),
 616                                 GFP_KERNEL);
 617
 618                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 619                         goto out_free;
 620                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 621         }
 622
 623         i = 0;
 624         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 625                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 626                 i++;
 627         }
 628
 629         return 0;
 630 out_free:
 631         drm_fb_helper_crtc_free(fb_helper);
 632         return -ENOMEM;
 633 }
 634 EXPORT_SYMBOL(drm_fb_helper_init);
 635
 636 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 637 {
 638         if (!list_empty(&fb_helper->kernel_fb_list)) {
 639                 list_del(&fb_helper->kernel_fb_list);
 640                 if (list_empty(&kernel_fb_helper_list)) {
 641 #if 0
 642                         pr_info("drm: unregistered panic notifier\n");
 643                         atomic_notifier_chain_unregister(&panic_notifier_list,
 644                                                          &paniced);
 645                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 646 #endif
 647                 }
 648         }
 649
 650         drm_fb_helper_crtc_free(fb_helper);
 651
 652 }
 653 EXPORT_SYMBOL(drm_fb_helper_fini);
 654
 655 #if 0
 656 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 657                      u16 blue, u16 regno, struct fb_info *info)
 658 {
 659         struct drm_fb_helper *fb_helper = info->par;
 660         struct drm_framebuffer *fb = fb_helper->fb;
 661         int pindex;
 662
 663         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 664                 u32 *palette;
 665                 u32 value;
 666                 /* place color in psuedopalette */
 667                 if (regno > 16)
 668                         return -EINVAL;
 669                 palette = (u32 *)info->pseudo_palette;
 670                 red >>= (16 - info->var.red.length);
 671                 green >>= (16 - info->var.green.length);
 672                 blue >>= (16 - info->var.blue.length);
 673                 value = (red << info->var.red.offset) |
 674                         (green << info->var.green.offset) |
 675                         (blue << info->var.blue.offset);
 676                 if (info->var.transp.length > 0) {
 677                         u32 mask = (1 << info->var.transp.length) - 1;
 678                         mask <<= info->var.transp.offset;
 679                         value |= mask;
 680                 }
 681                 palette[regno] = value;
 682                 return 0;
 683         }
 684
 685         /*
 686          * The driver really shouldn't advertise pseudo/directcolor
 687          * visuals if it can't deal with the palette.
 688          */
 689         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 690                     !fb_helper->funcs->gamma_get))
 691                 return -EINVAL;
 692
 693         pindex = regno;
 694
 695         if (fb->bits_per_pixel == 16) {
 696                 pindex = regno << 3;
 697
 698                 if (fb->depth == 16 && regno > 63)
 699                         return -EINVAL;
 700                 if (fb->depth == 15 && regno > 31)
 701                         return -EINVAL;
 702
 703                 if (fb->depth == 16) {
 704                         u16 r, g, b;
 705                         int i;
 706                         if (regno < 32) {
 707                                 for (i = 0; i < 8; i++)
 708                                         fb_helper->funcs->gamma_set(crtc, red,
 709                                                 green, blue, pindex + i);
 710                         }
 711
 712                         fb_helper->funcs->gamma_get(crtc, &r,
 713                                                     &g, &b,
 714                                                     pindex >> 1);
 715
 716                         for (i = 0; i < 4; i++)
 717                                 fb_helper->funcs->gamma_set(crtc, r,
 718                                                             green, b,
 719                                                             (pindex >> 1) + i);
 720                 }
 721         }
 722
 723         if (fb->depth != 16)
 724                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 725         return 0;
 726 }
 727
 728 /**
 729  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 730  * @cmap: cmap to set
 731  * @info: fbdev registered by the helper
 732  */
 733 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 734 {
 735         struct drm_fb_helper *fb_helper = info->par;
 736         struct drm_device *dev = fb_helper->dev;
 737         struct drm_crtc_helper_funcs *crtc_funcs;
 738         u16 *red, *green, *blue, *transp;
 739         struct drm_crtc *crtc;
 740         int i, j, rc = 0;
 741         int start;
 742
 743         drm_modeset_lock_all(dev);
 744         if (!drm_fb_helper_is_bound(fb_helper)) {
 745                 drm_modeset_unlock_all(dev);
 746                 return -EBUSY;
 747         }
 748
 749         for (i = 0; i < fb_helper->crtc_count; i++) {
 750                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 751                 crtc_funcs = crtc->helper_private;
 752
 753                 red = cmap->red;
 754                 green = cmap->green;
 755                 blue = cmap->blue;
 756                 transp = cmap->transp;
 757                 start = cmap->start;
 758
 759                 for (j = 0; j < cmap->len; j++) {
 760                         u16 hred, hgreen, hblue, htransp = 0xffff;
 761
 762                         hred = *red++;
 763                         hgreen = *green++;
 764                         hblue = *blue++;
 765
 766                         if (transp)
 767                                 htransp = *transp++;
 768
 769                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 770                         if (rc)
 771                                 goto out;
 772                 }
 773                 if (crtc_funcs->load_lut)
 774                         crtc_funcs->load_lut(crtc);
 775         }
 776  out:
 777         drm_modeset_unlock_all(dev);
 778         return rc;
 779 }
 780 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 781
 782 /**
 783  * drm_fb_helper_check_var - implementation for ->fb_check_var
 784  * @var: screeninfo to check
 785  * @info: fbdev registered by the helper
 786  */
 787 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 788                             struct fb_info *info)
 789 {
 790         struct drm_fb_helper *fb_helper = info->par;
 791         struct drm_framebuffer *fb = fb_helper->fb;
 792         int depth;
 793
 794         if (var->pixclock != 0 || in_dbg_master())
 795                 return -EINVAL;
 796
 797         /* Need to resize the fb object !!! */
 798         if (var->bits_per_pixel > fb->bits_per_pixel ||
 799             var->xres > fb->width || var->yres > fb->height ||
 800             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 801                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 802                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 803                           var->xres, var->yres, var->bits_per_pixel,
 804                           var->xres_virtual, var->yres_virtual,
 805                           fb->width, fb->height, fb->bits_per_pixel);
 806                 return -EINVAL;
 807         }
 808
 809         switch (var->bits_per_pixel) {
 810         case 16:
 811                 depth = (var->green.length == 6) ? 16 : 15;
 812                 break;
 813         case 32:
 814                 depth = (var->transp.length > 0) ? 32 : 24;
 815                 break;
 816         default:
 817                 depth = var->bits_per_pixel;
 818                 break;
 819         }
 820
 821         switch (depth) {
 822         case 8:
 823                 var->red.offset = 0;
 824                 var->green.offset = 0;
 825                 var->blue.offset = 0;
 826                 var->red.length = 8;
 827                 var->green.length = 8;
 828                 var->blue.length = 8;
 829                 var->transp.length = 0;
 830                 var->transp.offset = 0;
 831                 break;
 832         case 15:
 833                 var->red.offset = 10;
 834                 var->green.offset = 5;
 835                 var->blue.offset = 0;
 836                 var->red.length = 5;
 837                 var->green.length = 5;
 838                 var->blue.length = 5;
 839                 var->transp.length = 1;
 840                 var->transp.offset = 15;
 841                 break;
 842         case 16:
 843                 var->red.offset = 11;
 844                 var->green.offset = 5;
 845                 var->blue.offset = 0;
 846                 var->red.length = 5;
 847                 var->green.length = 6;
 848                 var->blue.length = 5;
 849                 var->transp.length = 0;
 850                 var->transp.offset = 0;
 851                 break;
 852         case 24:
 853                 var->red.offset = 16;
 854                 var->green.offset = 8;
 855                 var->blue.offset = 0;
 856                 var->red.length = 8;
 857                 var->green.length = 8;
 858                 var->blue.length = 8;
 859                 var->transp.length = 0;
 860                 var->transp.offset = 0;
 861                 break;
 862         case 32:
 863                 var->red.offset = 16;
 864                 var->green.offset = 8;
 865                 var->blue.offset = 0;
 866                 var->red.length = 8;
 867                 var->green.length = 8;
 868                 var->blue.length = 8;
 869                 var->transp.length = 8;
 870                 var->transp.offset = 24;
 871                 break;
 872         default:
 873                 return -EINVAL;
 874         }
 875         return 0;
 876 }
 877 EXPORT_SYMBOL(drm_fb_helper_check_var);
 878
 879 /**
 880  * drm_fb_helper_set_par - implementation for ->fb_set_par
 881  * @info: fbdev registered by the helper
 882  *
 883  * This will let fbcon do the mode init and is called at initialization time by
 884  * the fbdev core when registering the driver, and later on through the hotplug
 885  * callback.
 886  */
 887 int drm_fb_helper_set_par(struct fb_info *info)
 888 {
 889         struct drm_fb_helper *fb_helper = info->par;
 890         struct fb_var_screeninfo *var = &info->var;
 891
 892         if (var->pixclock != 0) {
 893                 DRM_ERROR("PIXEL CLOCK SET\n");
 894                 return -EINVAL;
 895         }
 896
 897         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 898
 899         if (fb_helper->delayed_hotplug) {
 900                 fb_helper->delayed_hotplug = false;
 901                 drm_fb_helper_hotplug_event(fb_helper);
 902         }
 903         return 0;
 904 }
 905 EXPORT_SYMBOL(drm_fb_helper_set_par);
 906
 907 /**
 908  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 909  * @var: updated screen information
 910  * @info: fbdev registered by the helper
 911  */
 912 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 913                               struct fb_info *info)
 914 {
 915         struct drm_fb_helper *fb_helper = info->par;
 916         struct drm_device *dev = fb_helper->dev;
 917         struct drm_mode_set *modeset;
 918         int ret = 0;
 919         int i;
 920
 921         drm_modeset_lock_all(dev);
 922         if (!drm_fb_helper_is_bound(fb_helper)) {
 923                 drm_modeset_unlock_all(dev);
 924                 return -EBUSY;
 925         }
 926
 927         for (i = 0; i < fb_helper->crtc_count; i++) {
 928                 modeset = &fb_helper->crtc_info[i].mode_set;
 929
 930                 modeset->x = var->xoffset;
 931                 modeset->y = var->yoffset;
 932
 933                 if (modeset->num_connectors) {
 934                         ret = drm_mode_set_config_internal(modeset);
 935                         if (!ret) {
 936                                 info->var.xoffset = var->xoffset;
 937                                 info->var.yoffset = var->yoffset;
 938                         }
 939                 }
 940         }
 941         drm_modeset_unlock_all(dev);
 942         return ret;
 943 }
 944 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 945 #endif
 946
 947 #ifdef __DragonFly__
 948 static void
 949 do_restore_fbdev_mode(void *context, int pending)
 950 {
 951         struct drm_fb_helper *fb_helper = context;
 952         struct drm_device *dev = fb_helper->dev;
 953
 954         if (!fb_helper->fb)
 955                 return;
 956
 957         drm_modeset_lock_all(dev);
 958         drm_fb_helper_restore_fbdev_mode(fb_helper);
 959         drm_modeset_unlock_all(dev);
 960 }
 961
 962 static void
 963 sc_restore_fbdev_mode(void *cookie)
 964 {
 965         struct drm_fb_helper *fb_helper = cookie;
 966
 967         if (!fb_helper->fb)
 968                 return;
 969
 970         taskqueue_enqueue(taskqueue_thread[0], &fb_helper->fb_mode_task);
 971 }
 972 #endif
 973
 974 /*
 975  * Allocates the backing storage and sets up the fbdev info structure through
 976  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 977  * notifier.
 978  */
 979 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 980                                          int preferred_bpp)
 981 {
 982         int ret = 0;
 983         int crtc_count = 0;
 984         int i;
 985         struct fb_info *info;
 986         struct drm_fb_helper_surface_size sizes;
 987         int gamma_size = 0;
 988 #ifdef __DragonFly__
 989         int kms_console = 1;
 990 #endif
 991
 992         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 993         sizes.surface_depth = 24;
 994         sizes.surface_bpp = 32;
 995         sizes.fb_width = (unsigned)-1;
 996         sizes.fb_height = (unsigned)-1;
 997
 998         /* if driver picks 8 or 16 by default use that
 999            for both depth/bpp */
1000         if (preferred_bpp != sizes.surface_bpp)
1001                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1002
1003         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1004         for (i = 0; i < fb_helper->connector_count; i++) {
1005                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1006                 struct drm_cmdline_mode *cmdline_mode;
1007
1008                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1009
1010                 if (cmdline_mode->bpp_specified) {
1011                         switch (cmdline_mode->bpp) {
1012                         case 8:
1013                                 sizes.surface_depth = sizes.surface_bpp = 8;
1014                                 break;
1015                         case 15:
1016                                 sizes.surface_depth = 15;
1017                                 sizes.surface_bpp = 16;
1018                                 break;
1019                         case 16:
1020                                 sizes.surface_depth = sizes.surface_bpp = 16;
1021                                 break;
1022                         case 24:
1023                                 sizes.surface_depth = sizes.surface_bpp = 24;
1024                                 break;
1025                         case 32:
1026                                 sizes.surface_depth = 24;
1027                                 sizes.surface_bpp = 32;
1028                                 break;
1029                         }
1030                         break;
1031                 }
1032         }
1033
1034         crtc_count = 0;
1035         for (i = 0; i < fb_helper->crtc_count; i++) {
1036                 struct drm_display_mode *desired_mode;
1037                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1038
1039                 if (desired_mode) {
1040                         if (gamma_size == 0)
1041                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1042                         if (desired_mode->hdisplay < sizes.fb_width)
1043                                 sizes.fb_width = desired_mode->hdisplay;
1044                         if (desired_mode->vdisplay < sizes.fb_height)
1045                                 sizes.fb_height = desired_mode->vdisplay;
1046                         if (desired_mode->hdisplay > sizes.surface_width)
1047                                 sizes.surface_width = desired_mode->hdisplay;
1048                         if (desired_mode->vdisplay > sizes.surface_height)
1049                                 sizes.surface_height = desired_mode->vdisplay;
1050                         crtc_count++;
1051                 }
1052         }
1053
1054         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1055                 /* hmm everyone went away - assume VGA cable just fell out
1056                    and will come back later. */
1057                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1058                 sizes.fb_width = sizes.surface_width = 1024;
1059                 sizes.fb_height = sizes.surface_height = 768;
1060         }
1061
1062         /* push down into drivers */
1063         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1064         if (ret < 0)
1065                 return ret;
1066
1067         info = fb_helper->fbdev;
1068
1069         /*
1070          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1071          * events, but at init time drm_setup_crtcs needs to be called before
1072          * the fb is allocated (since we need to figure out the desired size of
1073          * the fb before we can allocate it ...). Hence we need to fix things up
1074          * here again.
1075          */
1076         for (i = 0; i < fb_helper->crtc_count; i++)
1077                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1078                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1079
1080 #ifdef __DragonFly__
1081         TUNABLE_INT_FETCH("kern.kms_console", &kms_console);
1082         if (kms_console) {
1083                 TASK_INIT(&fb_helper->fb_mode_task, 0, do_restore_fbdev_mode,
1084                     fb_helper);
1085                 info->cookie = fb_helper;
1086                 info->restore = (void *)&sc_restore_fbdev_mode;
1087                 if (register_framebuffer(info) < 0)
1088                         return -EINVAL;
1089         }
1090 #endif
1091
1092 #if 0
1093         info->var.pixclock = 0;
1094         if (register_framebuffer(info) < 0)
1095                 return -EINVAL;
1096
1097         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1098                         info->node, info->fix.id);
1099
1100         /* Switch back to kernel console on panic */
1101         /* multi card linked list maybe */
1102         if (list_empty(&kernel_fb_helper_list)) {
1103                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1104                 atomic_notifier_chain_register(&panic_notifier_list,
1105                                                &paniced);
1106                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1107         }
1108
1109         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1110 #endif
1111
1112         return 0;
1113 }
1114
1115 #if 0
1116 /**
1117  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1118  * @info: fbdev registered by the helper
1119  * @pitch: desired pitch
1120  * @depth: desired depth
1121  *
1122  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1123  * fbdev emulations. Drivers which support acceleration methods which impose
1124  * additional constraints need to set up their own limits.
1125  *
1126  * Drivers should call this (or their equivalent setup code) from their
1127  * ->fb_probe callback.
1128  */
1129 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1130                             uint32_t depth)
1131 {
1132         info->fix.type = FB_TYPE_PACKED_PIXELS;
1133         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1134                 FB_VISUAL_TRUECOLOR;
1135         info->fix.mmio_start = 0;
1136         info->fix.mmio_len = 0;
1137         info->fix.type_aux = 0;
1138         info->fix.xpanstep = 1; /* doing it in hw */
1139         info->fix.ypanstep = 1; /* doing it in hw */
1140         info->fix.ywrapstep = 0;
1141         info->fix.accel = FB_ACCEL_NONE;
1142
1143         info->fix.line_length = pitch;
1144         return;
1145 }
1146 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1147
1148 /**
1149  * drm_fb_helper_fill_var - initalizes variable fbdev information
1150  * @info: fbdev instance to set up
1151  * @fb_helper: fb helper instance to use as template
1152  * @fb_width: desired fb width
1153  * @fb_height: desired fb height
1154  *
1155  * Sets up the variable fbdev metainformation from the given fb helper instance
1156  * and the drm framebuffer allocated in fb_helper->fb.
1157  *
1158  * Drivers should call this (or their equivalent setup code) from their
1159  * ->fb_probe callback after having allocated the fbdev backing
1160  * storage framebuffer.
1161  */
1162 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1163                             uint32_t fb_width, uint32_t fb_height)
1164 {
1165         struct drm_framebuffer *fb = fb_helper->fb;
1166         info->pseudo_palette = fb_helper->pseudo_palette;
1167         info->var.xres_virtual = fb->width;
1168         info->var.yres_virtual = fb->height;
1169         info->var.bits_per_pixel = fb->bits_per_pixel;
1170         info->var.accel_flags = FB_ACCELF_TEXT;
1171         info->var.xoffset = 0;
1172         info->var.yoffset = 0;
1173         info->var.activate = FB_ACTIVATE_NOW;
1174         info->var.height = -1;
1175         info->var.width = -1;
1176
1177         switch (fb->depth) {
1178         case 8:
1179                 info->var.red.offset = 0;
1180                 info->var.green.offset = 0;
1181                 info->var.blue.offset = 0;
1182                 info->var.red.length = 8; /* 8bit DAC */
1183                 info->var.green.length = 8;
1184                 info->var.blue.length = 8;
1185                 info->var.transp.offset = 0;
1186                 info->var.transp.length = 0;
1187                 break;
1188         case 15:
1189                 info->var.red.offset = 10;
1190                 info->var.green.offset = 5;
1191                 info->var.blue.offset = 0;
1192                 info->var.red.length = 5;
1193                 info->var.green.length = 5;
1194                 info->var.blue.length = 5;
1195                 info->var.transp.offset = 15;
1196                 info->var.transp.length = 1;
1197                 break;
1198         case 16:
1199                 info->var.red.offset = 11;
1200                 info->var.green.offset = 5;
1201                 info->var.blue.offset = 0;
1202                 info->var.red.length = 5;
1203                 info->var.green.length = 6;
1204                 info->var.blue.length = 5;
1205                 info->var.transp.offset = 0;
1206                 break;
1207         case 24:
1208                 info->var.red.offset = 16;
1209                 info->var.green.offset = 8;
1210                 info->var.blue.offset = 0;
1211                 info->var.red.length = 8;
1212                 info->var.green.length = 8;
1213                 info->var.blue.length = 8;
1214                 info->var.transp.offset = 0;
1215                 info->var.transp.length = 0;
1216                 break;
1217         case 32:
1218                 info->var.red.offset = 16;
1219                 info->var.green.offset = 8;
1220                 info->var.blue.offset = 0;
1221                 info->var.red.length = 8;
1222                 info->var.green.length = 8;
1223                 info->var.blue.length = 8;
1224                 info->var.transp.offset = 24;
1225                 info->var.transp.length = 8;
1226                 break;
1227         default:
1228                 break;
1229         }
1230
1231         info->var.xres = fb_width;
1232         info->var.yres = fb_height;
1233 }
1234 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1235 #endif
1236
1237 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1238                                                uint32_t maxX,
1239                                                uint32_t maxY)
1240 {
1241         struct drm_connector *connector;
1242         int count = 0;
1243         int i;
1244
1245         for (i = 0; i < fb_helper->connector_count; i++) {
1246                 connector = fb_helper->connector_info[i]->connector;
1247                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1248         }
1249
1250         return count;
1251 }
1252
1253 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1254 {
1255         struct drm_display_mode *mode;
1256
1257         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1258                 if (mode->hdisplay > width ||
1259                     mode->vdisplay > height)
1260                         continue;
1261                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1262                         return mode;
1263         }
1264         return NULL;
1265 }
1266 EXPORT_SYMBOL(drm_has_preferred_mode);
1267
1268 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1269 {
1270         return fb_connector->connector->cmdline_mode.specified;
1271 }
1272
1273 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1274                                                       int width, int height)
1275 {
1276         struct drm_cmdline_mode *cmdline_mode;
1277         struct drm_display_mode *mode = NULL;
1278         bool prefer_non_interlace;
1279
1280         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1281         if (cmdline_mode->specified == false)
1282                 return mode;
1283
1284         /* attempt to find a matching mode in the list of modes
1285          *  we have gotten so far, if not add a CVT mode that conforms
1286          */
1287         if (cmdline_mode->rb || cmdline_mode->margins)
1288                 goto create_mode;
1289
1290         prefer_non_interlace = !cmdline_mode->interlace;
1291  again:
1292         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1293                 /* check width/height */
1294                 if (mode->hdisplay != cmdline_mode->xres ||
1295                     mode->vdisplay != cmdline_mode->yres)
1296                         continue;
1297
1298                 if (cmdline_mode->refresh_specified) {
1299                         if (mode->vrefresh != cmdline_mode->refresh)
1300                                 continue;
1301                 }
1302
1303                 if (cmdline_mode->interlace) {
1304                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1305                                 continue;
1306                 } else if (prefer_non_interlace) {
1307                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1308                                 continue;
1309                 }
1310                 return mode;
1311         }
1312
1313         if (prefer_non_interlace) {
1314                 prefer_non_interlace = false;
1315                 goto again;
1316         }
1317
1318 create_mode:
1319         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1320                                                  cmdline_mode);
1321         list_add(&mode->head, &fb_helper_conn->connector->modes);
1322         return mode;
1323 }
1324 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1325
1326 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1327 {
1328         bool enable;
1329
1330         if (strict)
1331                 enable = connector->status == connector_status_connected;
1332         else
1333                 enable = connector->status != connector_status_disconnected;
1334
1335         return enable;
1336 }
1337
1338 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1339                                   bool *enabled)
1340 {
1341         bool any_enabled = false;
1342         struct drm_connector *connector;
1343         int i = 0;
1344
1345         for (i = 0; i < fb_helper->connector_count; i++) {
1346                 connector = fb_helper->connector_info[i]->connector;
1347                 enabled[i] = drm_connector_enabled(connector, true);
1348                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1349                           enabled[i] ? "yes" : "no");
1350                 any_enabled |= enabled[i];
1351         }
1352
1353         if (any_enabled)
1354                 return;
1355
1356         for (i = 0; i < fb_helper->connector_count; i++) {
1357                 connector = fb_helper->connector_info[i]->connector;
1358                 enabled[i] = drm_connector_enabled(connector, false);
1359         }
1360 }
1361
1362 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1363                               struct drm_display_mode **modes,
1364                               bool *enabled, int width, int height)
1365 {
1366         int count, i, j;
1367         bool can_clone = false;
1368         struct drm_fb_helper_connector *fb_helper_conn;
1369         struct drm_display_mode *dmt_mode, *mode;
1370
1371         /* only contemplate cloning in the single crtc case */
1372         if (fb_helper->crtc_count > 1)
1373                 return false;
1374
1375         count = 0;
1376         for (i = 0; i < fb_helper->connector_count; i++) {
1377                 if (enabled[i])
1378                         count++;
1379         }
1380
1381         /* only contemplate cloning if more than one connector is enabled */
1382         if (count <= 1)
1383                 return false;
1384
1385         /* check the command line or if nothing common pick 1024x768 */
1386         can_clone = true;
1387         for (i = 0; i < fb_helper->connector_count; i++) {
1388                 if (!enabled[i])
1389                         continue;
1390                 fb_helper_conn = fb_helper->connector_info[i];
1391                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1392                 if (!modes[i]) {
1393                         can_clone = false;
1394                         break;
1395                 }
1396                 for (j = 0; j < i; j++) {
1397                         if (!enabled[j])
1398                                 continue;
1399                         if (!drm_mode_equal(modes[j], modes[i]))
1400                                 can_clone = false;
1401                 }
1402         }
1403
1404         if (can_clone) {
1405                 DRM_DEBUG_KMS("can clone using command line\n");
1406                 return true;
1407         }
1408
1409         /* try and find a 1024x768 mode on each connector */
1410         can_clone = true;
1411         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1412
1413         for (i = 0; i < fb_helper->connector_count; i++) {
1414
1415                 if (!enabled[i])
1416                         continue;
1417
1418                 fb_helper_conn = fb_helper->connector_info[i];
1419                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1420                         if (drm_mode_equal(mode, dmt_mode))
1421                                 modes[i] = mode;
1422                 }
1423                 if (!modes[i])
1424                         can_clone = false;
1425         }
1426
1427         if (can_clone) {
1428                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1429                 return true;
1430         }
1431         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1432         return false;
1433 }
1434
1435 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1436                                  struct drm_display_mode **modes,
1437                                  bool *enabled, int width, int height)
1438 {
1439         struct drm_fb_helper_connector *fb_helper_conn;
1440         int i;
1441
1442         for (i = 0; i < fb_helper->connector_count; i++) {
1443                 fb_helper_conn = fb_helper->connector_info[i];
1444
1445                 if (enabled[i] == false)
1446                         continue;
1447
1448                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1449                               fb_helper_conn->connector->base.id);
1450
1451                 /* got for command line mode first */
1452                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1453                 if (!modes[i]) {
1454                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1455                                       fb_helper_conn->connector->base.id);
1456                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1457                 }
1458                 /* No preferred modes, pick one off the list */
1459                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1460                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1461                                 break;
1462                 }
1463                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1464                           "none");
1465         }
1466         return true;
1467 }
1468
1469 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1470                           struct drm_fb_helper_crtc **best_crtcs,
1471                           struct drm_display_mode **modes,
1472                           int n, int width, int height)
1473 {
1474         int c, o;
1475         struct drm_device *dev = fb_helper->dev;
1476         struct drm_connector *connector;
1477         struct drm_connector_helper_funcs *connector_funcs;
1478         struct drm_encoder *encoder;
1479         int my_score, best_score, score;
1480         struct drm_fb_helper_crtc **crtcs, *crtc;
1481         struct drm_fb_helper_connector *fb_helper_conn;
1482
1483         if (n == fb_helper->connector_count)
1484                 return 0;
1485
1486         fb_helper_conn = fb_helper->connector_info[n];
1487         connector = fb_helper_conn->connector;
1488
1489         best_crtcs[n] = NULL;
1490         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1491         if (modes[n] == NULL)
1492                 return best_score;
1493
1494         crtcs = kzalloc(dev->mode_config.num_connector *
1495                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1496         if (!crtcs)
1497                 return best_score;
1498
1499         my_score = 1;
1500         if (connector->status == connector_status_connected)
1501                 my_score++;
1502         if (drm_has_cmdline_mode(fb_helper_conn))
1503                 my_score++;
1504         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1505                 my_score++;
1506
1507         connector_funcs = connector->helper_private;
1508         encoder = connector_funcs->best_encoder(connector);
1509         if (!encoder)
1510                 goto out;
1511
1512         /* select a crtc for this connector and then attempt to configure
1513            remaining connectors */
1514         for (c = 0; c < fb_helper->crtc_count; c++) {
1515                 crtc = &fb_helper->crtc_info[c];
1516
1517                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1518                         continue;
1519
1520                 for (o = 0; o < n; o++)
1521                         if (best_crtcs[o] == crtc)
1522                                 break;
1523
1524                 if (o < n) {
1525                         /* ignore cloning unless only a single crtc */
1526                         if (fb_helper->crtc_count > 1)
1527                                 continue;
1528
1529                         if (!drm_mode_equal(modes[o], modes[n]))
1530                                 continue;
1531                 }
1532
1533                 crtcs[n] = crtc;
1534                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1535                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1536                                                   width, height);
1537                 if (score > best_score) {
1538                         best_score = score;
1539                         memcpy(best_crtcs, crtcs,
1540                                dev->mode_config.num_connector *
1541                                sizeof(struct drm_fb_helper_crtc *));
1542                 }
1543         }
1544 out:
1545         kfree(crtcs);
1546         return best_score;
1547 }
1548
1549 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1550 {
1551         struct drm_device *dev = fb_helper->dev;
1552         struct drm_fb_helper_crtc **crtcs;
1553         struct drm_display_mode **modes;
1554         struct drm_mode_set *modeset;
1555         bool *enabled;
1556         int width, height;
1557         int i;
1558
1559         DRM_DEBUG_KMS("\n");
1560
1561         width = dev->mode_config.max_width;
1562         height = dev->mode_config.max_height;
1563
1564         crtcs = kcalloc(dev->mode_config.num_connector,
1565                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1566         modes = kcalloc(dev->mode_config.num_connector,
1567                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1568         enabled = kcalloc(dev->mode_config.num_connector,
1569                           sizeof(bool), GFP_KERNEL);
1570         if (!crtcs || !modes || !enabled) {
1571                 DRM_ERROR("Memory allocation failed\n");
1572                 goto out;
1573         }
1574
1575
1576         drm_enable_connectors(fb_helper, enabled);
1577
1578         if (!(fb_helper->funcs->initial_config &&
1579               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1580                                                enabled, width, height))) {
1581                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1582                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1583
1584                 if (!drm_target_cloned(fb_helper,
1585                                        modes, enabled, width, height) &&
1586                     !drm_target_preferred(fb_helper,
1587                                           modes, enabled, width, height))
1588                         DRM_ERROR("Unable to find initial modes\n");
1589
1590                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1591                               width, height);
1592
1593                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1594         }
1595
1596         /* need to set the modesets up here for use later */
1597         /* fill out the connector<->crtc mappings into the modesets */
1598         for (i = 0; i < fb_helper->crtc_count; i++) {
1599                 modeset = &fb_helper->crtc_info[i].mode_set;
1600                 modeset->num_connectors = 0;
1601                 modeset->fb = NULL;
1602         }
1603
1604         for (i = 0; i < fb_helper->connector_count; i++) {
1605                 struct drm_display_mode *mode = modes[i];
1606                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1607                 modeset = &fb_crtc->mode_set;
1608
1609                 if (mode && fb_crtc) {
1610                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1611                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1612                         fb_crtc->desired_mode = mode;
1613                         if (modeset->mode)
1614                                 drm_mode_destroy(dev, modeset->mode);
1615                         modeset->mode = drm_mode_duplicate(dev,
1616                                                            fb_crtc->desired_mode);
1617                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1618                         modeset->fb = fb_helper->fb;
1619                 }
1620         }
1621
1622         /* Clear out any old modes if there are no more connected outputs. */
1623         for (i = 0; i < fb_helper->crtc_count; i++) {
1624                 modeset = &fb_helper->crtc_info[i].mode_set;
1625                 if (modeset->num_connectors == 0) {
1626                         BUG_ON(modeset->fb);
1627                         BUG_ON(modeset->num_connectors);
1628                         if (modeset->mode)
1629                                 drm_mode_destroy(dev, modeset->mode);
1630                         modeset->mode = NULL;
1631                 }
1632         }
1633 out:
1634         kfree(crtcs);
1635         kfree(modes);
1636         kfree(enabled);
1637 }
1638
1639 /**
1640  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1641  * @fb_helper: fb_helper device struct
1642  * @bpp_sel: bpp value to use for the framebuffer configuration
1643  *
1644  * Scans the CRTCs and connectors and tries to put together an initial setup.
1645  * At the moment, this is a cloned configuration across all heads with
1646  * a new framebuffer object as the backing store.
1647  *
1648  * Note that this also registers the fbdev and so allows userspace to call into
1649  * the driver through the fbdev interfaces.
1650  *
1651  * This function will call down into the ->fb_probe callback to let
1652  * the driver allocate and initialize the fbdev info structure and the drm
1653  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1654  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1655  * values for the fbdev info structure.
1656  *
1657  * RETURNS:
1658  * Zero if everything went ok, nonzero otherwise.
1659  */
1660 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1661 {
1662         struct drm_device *dev = fb_helper->dev;
1663         int count = 0;
1664
1665         mutex_lock(&dev->mode_config.mutex);
1666         count = drm_fb_helper_probe_connector_modes(fb_helper,
1667                                                     dev->mode_config.max_width,
1668                                                     dev->mode_config.max_height);
1669         mutex_unlock(&dev->mode_config.mutex);
1670         /*
1671          * we shouldn't end up with no modes here.
1672          */
1673         if (count == 0)
1674                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1675
1676         drm_setup_crtcs(fb_helper);
1677
1678         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1679 }
1680 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1681
1682 /**
1683  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1684  *                               probing all the outputs attached to the fb
1685  * @fb_helper: the drm_fb_helper
1686  *
1687  * Scan the connectors attached to the fb_helper and try to put together a
1688  * setup after *notification of a change in output configuration.
1689  *
1690  * Called at runtime, takes the mode config locks to be able to check/change the
1691  * modeset configuration. Must be run from process context (which usually means
1692  * either the output polling work or a work item launched from the driver's
1693  * hotplug interrupt).
1694  *
1695  * Note that drivers may call this even before calling
1696  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1697  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1698  * not miss any hotplug events.
1699  *
1700  * RETURNS:
1701  * 0 on success and a non-zero error code otherwise.
1702  */
1703 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1704 {
1705         struct drm_device *dev = fb_helper->dev;
1706         u32 max_width, max_height;
1707
1708         mutex_lock(&fb_helper->dev->mode_config.mutex);
1709         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1710                 fb_helper->delayed_hotplug = true;
1711                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1712                 return 0;
1713         }
1714         DRM_DEBUG_KMS("\n");
1715
1716         max_width = fb_helper->fb->width;
1717         max_height = fb_helper->fb->height;
1718
1719         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1720         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1721
1722         drm_modeset_lock_all(dev);
1723         drm_setup_crtcs(fb_helper);
1724         drm_modeset_unlock_all(dev);
1725 #if 0
1726         drm_fb_helper_set_par(fb_helper->fbdev);
1727 #endif
1728
1729         return 0;
1730 }
1731 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1732
1733 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1734  * but the module doesn't depend on any fb console symbols.  At least
1735  * attempt to load fbcon to avoid leaving the system without a usable console.
1736  */
1737 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1738 static int __init drm_fb_helper_modinit(void)
1739 {
1740         const char *name = "fbcon";
1741         struct module *fbcon;
1742
1743         mutex_lock(&module_mutex);
1744         fbcon = find_module(name);
1745         mutex_unlock(&module_mutex);
1746
1747         if (!fbcon)
1748                 request_module_nowait(name);
1749         return 0;
1750 }
1751
1752 module_init(drm_fb_helper_modinit);
1753 #endif