kernel/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 four-step process with drm_fb_helper_prepare(),
  53  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  54  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  55  * default behaviour can override the third step with their own code.
  56  * Teardown is done with drm_fb_helper_fini().
  57  *
  58  * At runtime drivers should restore the fbdev console by calling
  59  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  60  * should also notify the fb helper code from updates to the output
  61  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  62  * integration with the output polling code in drm_crtc_helper.c the modeset
  63  * code provides a ->output_poll_changed callback.
  64  *
  65  * All other functions exported by the fb helper library can be used to
  66  * implement the fbdev driver interface by the driver.
  67  *
  68  * It is possible, though perhaps somewhat tricky, to implement race-free
  69  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  70  * helper must be called first to initialize the minimum required to make
  71  * hotplug detection work. Drivers also need to make sure to properly set up
  72  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  73  * it is safe to enable interrupts and start processing hotplug events. At the
  74  * same time, drivers should initialize all modeset objects such as CRTCs,
  75  * encoders and connectors. To finish up the fbdev helper initialization, the
  76  * drm_fb_helper_init() function is called. To probe for all attached displays
  77  * and set up an initial configuration using the detected hardware, drivers
  78  * should call drm_fb_helper_single_add_all_connectors() followed by
  79  * drm_fb_helper_initial_config().
  80  */
  81
  82 /**
  83  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  84  *                                             emulation helper
  85  * @fb_helper: fbdev initialized with drm_fb_helper_init
  86  *
  87  * This functions adds all the available connectors for use with the given
  88  * fb_helper. This is a separate step to allow drivers to freely assign
  89  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  90  * not adequate to be used for the fbcon.
  91  *
  92  * Since this is part of the initial setup before the fbdev is published, no
  93  * locking is required.
  94  */
  95 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  96 {
  97         struct drm_device *dev = fb_helper->dev;
  98         struct drm_connector *connector;
  99         int i;
 100
 101         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 102                 struct drm_fb_helper_connector *fb_helper_connector;
 103
 104                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 105                 if (!fb_helper_connector)
 106                         goto fail;
 107
 108                 fb_helper_connector->connector = connector;
 109                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 110         }
 111         return 0;
 112 fail:
 113         for (i = 0; i < fb_helper->connector_count; i++) {
 114                 kfree(fb_helper->connector_info[i]);
 115                 fb_helper->connector_info[i] = NULL;
 116         }
 117         fb_helper->connector_count = 0;
 118         return -ENOMEM;
 119 }
 120 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 121
 122 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 123 {
 124         struct drm_fb_helper_connector **temp;
 125         struct drm_fb_helper_connector *fb_helper_connector;
 126
 127         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 128         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 129                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 130                 if (!temp)
 131                         return -ENOMEM;
 132
 133                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 134                 fb_helper->connector_info = temp;
 135         }
 136
 137
 138         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 139         if (!fb_helper_connector)
 140                 return -ENOMEM;
 141
 142         fb_helper_connector->connector = connector;
 143         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 144         return 0;
 145 }
 146 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 147
 148 static void remove_from_modeset(struct drm_mode_set *set,
 149                 struct drm_connector *connector)
 150 {
 151         int i, j;
 152
 153         for (i = 0; i < set->num_connectors; i++) {
 154                 if (set->connectors[i] == connector)
 155                         break;
 156         }
 157
 158         if (i == set->num_connectors)
 159                 return;
 160
 161         for (j = i + 1; j < set->num_connectors; j++) {
 162                 set->connectors[j - 1] = set->connectors[j];
 163         }
 164         set->num_connectors--;
 165
 166         /* because i915 is pissy about this..
 167          * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 168          */
 169         if (set->num_connectors == 0)
 170                 set->fb = NULL;
 171 }
 172
 173 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 174                                        struct drm_connector *connector)
 175 {
 176         struct drm_fb_helper_connector *fb_helper_connector;
 177         int i, j;
 178
 179         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 180
 181         for (i = 0; i < fb_helper->connector_count; i++) {
 182                 if (fb_helper->connector_info[i]->connector == connector)
 183                         break;
 184         }
 185
 186         if (i == fb_helper->connector_count)
 187                 return -EINVAL;
 188         fb_helper_connector = fb_helper->connector_info[i];
 189
 190         for (j = i + 1; j < fb_helper->connector_count; j++) {
 191                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 192         }
 193         fb_helper->connector_count--;
 194         kfree(fb_helper_connector);
 195
 196         /* also cleanup dangling references to the connector: */
 197         for (i = 0; i < fb_helper->crtc_count; i++)
 198                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 203
 204 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 205 {
 206         uint16_t *r_base, *g_base, *b_base;
 207         int i;
 208
 209         if (helper->funcs->gamma_get == NULL)
 210                 return;
 211
 212         r_base = crtc->gamma_store;
 213         g_base = r_base + crtc->gamma_size;
 214         b_base = g_base + crtc->gamma_size;
 215
 216         for (i = 0; i < crtc->gamma_size; i++)
 217                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 218 }
 219
 220 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 221 {
 222         uint16_t *r_base, *g_base, *b_base;
 223
 224         if (crtc->funcs->gamma_set == NULL)
 225                 return;
 226
 227         r_base = crtc->gamma_store;
 228         g_base = r_base + crtc->gamma_size;
 229         b_base = g_base + crtc->gamma_size;
 230
 231         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 232 }
 233
 234 /**
 235  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 236  * @info: fbdev registered by the helper
 237  */
 238 int drm_fb_helper_debug_enter(struct fb_info *info)
 239 {
 240         struct drm_fb_helper *helper = info->par;
 241         const struct drm_crtc_helper_funcs *funcs;
 242         int i;
 243
 244         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 245                 for (i = 0; i < helper->crtc_count; i++) {
 246                         struct drm_mode_set *mode_set =
 247                                 &helper->crtc_info[i].mode_set;
 248
 249                         if (!mode_set->crtc->enabled)
 250                                 continue;
 251
 252                         funcs = mode_set->crtc->helper_private;
 253                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 254                         funcs->mode_set_base_atomic(mode_set->crtc,
 255                                                     mode_set->fb,
 256                                                     mode_set->x,
 257                                                     mode_set->y,
 258                                                     ENTER_ATOMIC_MODE_SET);
 259                 }
 260         }
 261
 262         return 0;
 263 }
 264 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 265
 266 /* Find the real fb for a given fb helper CRTC */
 267 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 268 {
 269         struct drm_device *dev = crtc->dev;
 270         struct drm_crtc *c;
 271
 272         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 273                 if (crtc->base.id == c->base.id)
 274                         return c->primary->fb;
 275         }
 276
 277         return NULL;
 278 }
 279
 280 /**
 281  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 282  * @info: fbdev registered by the helper
 283  */
 284 int drm_fb_helper_debug_leave(struct fb_info *info)
 285 {
 286         struct drm_fb_helper *helper = info->par;
 287         struct drm_crtc *crtc;
 288         const struct drm_crtc_helper_funcs *funcs;
 289         struct drm_framebuffer *fb;
 290         int i;
 291
 292         for (i = 0; i < helper->crtc_count; i++) {
 293                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 294                 crtc = mode_set->crtc;
 295                 funcs = crtc->helper_private;
 296                 fb = drm_mode_config_fb(crtc);
 297
 298                 if (!crtc->enabled)
 299                         continue;
 300
 301                 if (!fb) {
 302                         DRM_ERROR("no fb to restore??\n");
 303                         continue;
 304                 }
 305
 306                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 307                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 308                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 309         }
 310
 311         return 0;
 312 }
 313 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 314
 315 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 316 {
 317         struct drm_device *dev = fb_helper->dev;
 318         struct drm_plane *plane;
 319         bool error = false;
 320         int i;
 321
 322         drm_warn_on_modeset_not_all_locked(dev);
 323
 324         list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
 325                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 326                         drm_plane_force_disable(plane);
 327
 328                 if (dev->mode_config.rotation_property) {
 329                         drm_mode_plane_set_obj_prop(plane,
 330                                                     dev->mode_config.rotation_property,
 331                                                     BIT(DRM_ROTATE_0));
 332                 }
 333         }
 334
 335         for (i = 0; i < fb_helper->crtc_count; i++) {
 336                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 337                 struct drm_crtc *crtc = mode_set->crtc;
 338                 int ret;
 339
 340                 if (crtc->funcs->cursor_set) {
 341                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 342                         if (ret)
 343                                 error = true;
 344                 }
 345
 346                 ret = drm_mode_set_config_internal(mode_set);
 347                 if (ret)
 348                         error = true;
 349         }
 350         return error;
 351 }
 352 /**
 353  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 354  * @fb_helper: fbcon to restore
 355  *
 356  * This should be called from driver's drm ->lastclose callback
 357  * when implementing an fbcon on top of kms using this helper. This ensures that
 358  * the user isn't greeted with a black screen when e.g. X dies.
 359  *
 360  * Use this variant if you need to bypass locking (panic), or already
 361  * hold all modeset locks.  Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
 362  */
 363 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 364 {
 365         return restore_fbdev_mode(fb_helper);
 366 }
 367
 368 /**
 369  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 370  * @fb_helper: fbcon to restore
 371  *
 372  * This should be called from driver's drm ->lastclose callback
 373  * when implementing an fbcon on top of kms using this helper. This ensures that
 374  * the user isn't greeted with a black screen when e.g. X dies.
 375  */
 376 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 377 {
 378         struct drm_device *dev = fb_helper->dev;
 379         bool ret;
 380         bool do_delayed = false;
 381
 382         drm_modeset_lock_all(dev);
 383         ret = restore_fbdev_mode(fb_helper);
 384
 385         do_delayed = fb_helper->delayed_hotplug;
 386         if (do_delayed)
 387                 fb_helper->delayed_hotplug = false;
 388         drm_modeset_unlock_all(dev);
 389
 390         if (do_delayed)
 391                 drm_fb_helper_hotplug_event(fb_helper);
 392         return ret;
 393 }
 394 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 395
 396 /*
 397  * restore fbcon display for all kms driver's using this helper, used for sysrq
 398  * and panic handling.
 399  */
 400 static bool drm_fb_helper_force_kernel_mode(void)
 401 {
 402         bool ret, error = false;
 403         struct drm_fb_helper *helper;
 404
 405         if (list_empty(&kernel_fb_helper_list))
 406                 return false;
 407
 408         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 409                 struct drm_device *dev = helper->dev;
 410
 411                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 412                         continue;
 413
 414                 /*
 415                  * NOTE: Use trylock mode to avoid deadlocks and sleeping in
 416                  * panic context.
 417                  */
 418                 if (__drm_modeset_lock_all(dev, true) != 0) {
 419                         error = true;
 420                         continue;
 421                 }
 422
 423                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 424                 if (ret)
 425                         error = true;
 426
 427                 drm_modeset_unlock_all(dev);
 428         }
 429         return error;
 430 }
 431
 432 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 433                         void *panic_str)
 434 {
 435         /*
 436          * It's a waste of time and effort to switch back to text console
 437          * if the kernel should reboot before panic messages can be seen.
 438          */
 439         if (panic_timeout < 0)
 440                 return 0;
 441
 442         pr_err("panic occurred, switching back to text console\n");
 443         return drm_fb_helper_force_kernel_mode();
 444 }
 445
 446 static struct notifier_block paniced = {
 447         .notifier_call = drm_fb_helper_panic,
 448 };
 449
 450 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 451 {
 452         struct drm_device *dev = fb_helper->dev;
 453         struct drm_crtc *crtc;
 454         int bound = 0, crtcs_bound = 0;
 455
 456         /* Sometimes user space wants everything disabled, so don't steal the
 457          * display if there's a master. */
 458         if (dev->primary->master)
 459                 return false;
 460
 461         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 462                 if (crtc->primary->fb)
 463                         crtcs_bound++;
 464                 if (crtc->primary->fb == fb_helper->fb)
 465                         bound++;
 466         }
 467
 468         if (bound < crtcs_bound)
 469                 return false;
 470
 471         return true;
 472 }
 473
 474 #ifdef CONFIG_MAGIC_SYSRQ
 475 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 476 {
 477         bool ret;
 478         ret = drm_fb_helper_force_kernel_mode();
 479         if (ret == true)
 480                 DRM_ERROR("Failed to restore crtc configuration\n");
 481 }
 482 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 483
 484 static void drm_fb_helper_sysrq(int dummy1)
 485 {
 486         schedule_work(&drm_fb_helper_restore_work);
 487 }
 488
 489 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 490         .handler = drm_fb_helper_sysrq,
 491         .help_msg = "force-fb(V)",
 492         .action_msg = "Restore framebuffer console",
 493 };
 494 #else
 495 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 496 #endif
 497
 498 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 499 {
 500         struct drm_fb_helper *fb_helper = info->par;
 501         struct drm_device *dev = fb_helper->dev;
 502         struct drm_crtc *crtc;
 503         struct drm_connector *connector;
 504         int i, j;
 505
 506         /*
 507          * fbdev->blank can be called from irq context in case of a panic.
 508          * Since we already have our own special panic handler which will
 509          * restore the fbdev console mode completely, just bail out early.
 510          */
 511         if (oops_in_progress)
 512                 return;
 513
 514         /*
 515          * For each CRTC in this fb, turn the connectors on/off.
 516          */
 517         drm_modeset_lock_all(dev);
 518         if (!drm_fb_helper_is_bound(fb_helper)) {
 519                 drm_modeset_unlock_all(dev);
 520                 return;
 521         }
 522
 523         for (i = 0; i < fb_helper->crtc_count; i++) {
 524                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 525
 526                 if (!crtc->enabled)
 527                         continue;
 528
 529                 /* Walk the connectors & encoders on this fb turning them on/off */
 530                 for (j = 0; j < fb_helper->connector_count; j++) {
 531                         connector = fb_helper->connector_info[j]->connector;
 532                         connector->funcs->dpms(connector, dpms_mode);
 533                         drm_object_property_set_value(&connector->base,
 534                                 dev->mode_config.dpms_property, dpms_mode);
 535                 }
 536         }
 537         drm_modeset_unlock_all(dev);
 538 }
 539
 540 /**
 541  * drm_fb_helper_blank - implementation for ->fb_blank
 542  * @blank: desired blanking state
 543  * @info: fbdev registered by the helper
 544  */
 545 int drm_fb_helper_blank(int blank, struct fb_info *info)
 546 {
 547         switch (blank) {
 548         /* Display: On; HSync: On, VSync: On */
 549         case FB_BLANK_UNBLANK:
 550                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 551                 break;
 552         /* Display: Off; HSync: On, VSync: On */
 553         case FB_BLANK_NORMAL:
 554                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 555                 break;
 556         /* Display: Off; HSync: Off, VSync: On */
 557         case FB_BLANK_HSYNC_SUSPEND:
 558                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 559                 break;
 560         /* Display: Off; HSync: On, VSync: Off */
 561         case FB_BLANK_VSYNC_SUSPEND:
 562                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 563                 break;
 564         /* Display: Off; HSync: Off, VSync: Off */
 565         case FB_BLANK_POWERDOWN:
 566                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 567                 break;
 568         }
 569         return 0;
 570 }
 571 EXPORT_SYMBOL(drm_fb_helper_blank);
 572
 573 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 574 {
 575         int i;
 576
 577         for (i = 0; i < helper->connector_count; i++)
 578                 kfree(helper->connector_info[i]);
 579         kfree(helper->connector_info);
 580         for (i = 0; i < helper->crtc_count; i++) {
 581                 kfree(helper->crtc_info[i].mode_set.connectors);
 582                 if (helper->crtc_info[i].mode_set.mode)
 583                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 584         }
 585         kfree(helper->crtc_info);
 586 }
 587
 588 /**
 589  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 590  * @dev: DRM device
 591  * @helper: driver-allocated fbdev helper structure to set up
 592  * @funcs: pointer to structure of functions associate with this helper
 593  *
 594  * Sets up the bare minimum to make the framebuffer helper usable. This is
 595  * useful to implement race-free initialization of the polling helpers.
 596  */
 597 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 598                            const struct drm_fb_helper_funcs *funcs)
 599 {
 600         INIT_LIST_HEAD(&helper->kernel_fb_list);
 601         helper->funcs = funcs;
 602         helper->dev = dev;
 603 }
 604 EXPORT_SYMBOL(drm_fb_helper_prepare);
 605
 606 /**
 607  * drm_fb_helper_init - initialize a drm_fb_helper structure
 608  * @dev: drm device
 609  * @fb_helper: driver-allocated fbdev helper structure to initialize
 610  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 611  * @max_conn_count: max connector count
 612  *
 613  * This allocates the structures for the fbdev helper with the given limits.
 614  * Note that this won't yet touch the hardware (through the driver interfaces)
 615  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 616  * to allow driver writes more control over the exact init sequence.
 617  *
 618  * Drivers must call drm_fb_helper_prepare() before calling this function.
 619  *
 620  * RETURNS:
 621  * Zero if everything went ok, nonzero otherwise.
 622  */
 623 int drm_fb_helper_init(struct drm_device *dev,
 624                        struct drm_fb_helper *fb_helper,
 625                        int crtc_count, int max_conn_count)
 626 {
 627         struct drm_crtc *crtc;
 628         int i;
 629
 630         if (!max_conn_count)
 631                 return -EINVAL;
 632
 633         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 634         if (!fb_helper->crtc_info)
 635                 return -ENOMEM;
 636
 637         fb_helper->crtc_count = crtc_count;
 638         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 639         if (!fb_helper->connector_info) {
 640                 kfree(fb_helper->crtc_info);
 641                 return -ENOMEM;
 642         }
 643         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 644         fb_helper->connector_count = 0;
 645
 646         for (i = 0; i < crtc_count; i++) {
 647                 fb_helper->crtc_info[i].mode_set.connectors =
 648                         kcalloc(max_conn_count,
 649                                 sizeof(struct drm_connector *),
 650                                 GFP_KERNEL);
 651
 652                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 653                         goto out_free;
 654                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 655         }
 656
 657         i = 0;
 658         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 659                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 660                 i++;
 661         }
 662
 663         return 0;
 664 out_free:
 665         drm_fb_helper_crtc_free(fb_helper);
 666         return -ENOMEM;
 667 }
 668 EXPORT_SYMBOL(drm_fb_helper_init);
 669
 670 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 671 {
 672         if (!list_empty(&fb_helper->kernel_fb_list)) {
 673                 list_del(&fb_helper->kernel_fb_list);
 674                 if (list_empty(&kernel_fb_helper_list)) {
 675                         pr_info("drm: unregistered panic notifier\n");
 676                         atomic_notifier_chain_unregister(&panic_notifier_list,
 677                                                          &paniced);
 678                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 679                 }
 680         }
 681
 682         drm_fb_helper_crtc_free(fb_helper);
 683
 684 }
 685 EXPORT_SYMBOL(drm_fb_helper_fini);
 686
 687 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 688                      u16 blue, u16 regno, struct fb_info *info)
 689 {
 690         struct drm_fb_helper *fb_helper = info->par;
 691         struct drm_framebuffer *fb = fb_helper->fb;
 692         int pindex;
 693
 694         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 695                 u32 *palette;
 696                 u32 value;
 697                 /* place color in psuedopalette */
 698                 if (regno > 16)
 699                         return -EINVAL;
 700                 palette = (u32 *)info->pseudo_palette;
 701                 red >>= (16 - info->var.red.length);
 702                 green >>= (16 - info->var.green.length);
 703                 blue >>= (16 - info->var.blue.length);
 704                 value = (red << info->var.red.offset) |
 705                         (green << info->var.green.offset) |
 706                         (blue << info->var.blue.offset);
 707                 if (info->var.transp.length > 0) {
 708                         u32 mask = (1 << info->var.transp.length) - 1;
 709                         mask <<= info->var.transp.offset;
 710                         value |= mask;
 711                 }
 712                 palette[regno] = value;
 713                 return 0;
 714         }
 715
 716         /*
 717          * The driver really shouldn't advertise pseudo/directcolor
 718          * visuals if it can't deal with the palette.
 719          */
 720         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 721                     !fb_helper->funcs->gamma_get))
 722                 return -EINVAL;
 723
 724         pindex = regno;
 725
 726         if (fb->bits_per_pixel == 16) {
 727                 pindex = regno << 3;
 728
 729                 if (fb->depth == 16 && regno > 63)
 730                         return -EINVAL;
 731                 if (fb->depth == 15 && regno > 31)
 732                         return -EINVAL;
 733
 734                 if (fb->depth == 16) {
 735                         u16 r, g, b;
 736                         int i;
 737                         if (regno < 32) {
 738                                 for (i = 0; i < 8; i++)
 739                                         fb_helper->funcs->gamma_set(crtc, red,
 740                                                 green, blue, pindex + i);
 741                         }
 742
 743                         fb_helper->funcs->gamma_get(crtc, &r,
 744                                                     &g, &b,
 745                                                     pindex >> 1);
 746
 747                         for (i = 0; i < 4; i++)
 748                                 fb_helper->funcs->gamma_set(crtc, r,
 749                                                             green, b,
 750                                                             (pindex >> 1) + i);
 751                 }
 752         }
 753
 754         if (fb->depth != 16)
 755                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 756         return 0;
 757 }
 758
 759 /**
 760  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 761  * @cmap: cmap to set
 762  * @info: fbdev registered by the helper
 763  */
 764 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 765 {
 766         struct drm_fb_helper *fb_helper = info->par;
 767         struct drm_device *dev = fb_helper->dev;
 768         const struct drm_crtc_helper_funcs *crtc_funcs;
 769         u16 *red, *green, *blue, *transp;
 770         struct drm_crtc *crtc;
 771         int i, j, rc = 0;
 772         int start;
 773
 774         if (__drm_modeset_lock_all(dev, !!oops_in_progress)) {
 775                 return -EBUSY;
 776         }
 777         if (!drm_fb_helper_is_bound(fb_helper)) {
 778                 drm_modeset_unlock_all(dev);
 779                 return -EBUSY;
 780         }
 781
 782         for (i = 0; i < fb_helper->crtc_count; i++) {
 783                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 784                 crtc_funcs = crtc->helper_private;
 785
 786                 red = cmap->red;
 787                 green = cmap->green;
 788                 blue = cmap->blue;
 789                 transp = cmap->transp;
 790                 start = cmap->start;
 791
 792                 for (j = 0; j < cmap->len; j++) {
 793                         u16 hred, hgreen, hblue, htransp = 0xffff;
 794
 795                         hred = *red++;
 796                         hgreen = *green++;
 797                         hblue = *blue++;
 798
 799                         if (transp)
 800                                 htransp = *transp++;
 801
 802                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 803                         if (rc)
 804                                 goto out;
 805                 }
 806                 if (crtc_funcs->load_lut)
 807                         crtc_funcs->load_lut(crtc);
 808         }
 809  out:
 810         drm_modeset_unlock_all(dev);
 811         return rc;
 812 }
 813 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 814
 815 /**
 816  * drm_fb_helper_check_var - implementation for ->fb_check_var
 817  * @var: screeninfo to check
 818  * @info: fbdev registered by the helper
 819  */
 820 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 821                             struct fb_info *info)
 822 {
 823         struct drm_fb_helper *fb_helper = info->par;
 824         struct drm_framebuffer *fb = fb_helper->fb;
 825         int depth;
 826
 827         if (var->pixclock != 0 || in_dbg_master())
 828                 return -EINVAL;
 829
 830         /* Need to resize the fb object !!! */
 831         if (var->bits_per_pixel > fb->bits_per_pixel ||
 832             var->xres > fb->width || var->yres > fb->height ||
 833             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 834                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 835                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 836                           var->xres, var->yres, var->bits_per_pixel,
 837                           var->xres_virtual, var->yres_virtual,
 838                           fb->width, fb->height, fb->bits_per_pixel);
 839                 return -EINVAL;
 840         }
 841
 842         switch (var->bits_per_pixel) {
 843         case 16:
 844                 depth = (var->green.length == 6) ? 16 : 15;
 845                 break;
 846         case 32:
 847                 depth = (var->transp.length > 0) ? 32 : 24;
 848                 break;
 849         default:
 850                 depth = var->bits_per_pixel;
 851                 break;
 852         }
 853
 854         switch (depth) {
 855         case 8:
 856                 var->red.offset = 0;
 857                 var->green.offset = 0;
 858                 var->blue.offset = 0;
 859                 var->red.length = 8;
 860                 var->green.length = 8;
 861                 var->blue.length = 8;
 862                 var->transp.length = 0;
 863                 var->transp.offset = 0;
 864                 break;
 865         case 15:
 866                 var->red.offset = 10;
 867                 var->green.offset = 5;
 868                 var->blue.offset = 0;
 869                 var->red.length = 5;
 870                 var->green.length = 5;
 871                 var->blue.length = 5;
 872                 var->transp.length = 1;
 873                 var->transp.offset = 15;
 874                 break;
 875         case 16:
 876                 var->red.offset = 11;
 877                 var->green.offset = 5;
 878                 var->blue.offset = 0;
 879                 var->red.length = 5;
 880                 var->green.length = 6;
 881                 var->blue.length = 5;
 882                 var->transp.length = 0;
 883                 var->transp.offset = 0;
 884                 break;
 885         case 24:
 886                 var->red.offset = 16;
 887                 var->green.offset = 8;
 888                 var->blue.offset = 0;
 889                 var->red.length = 8;
 890                 var->green.length = 8;
 891                 var->blue.length = 8;
 892                 var->transp.length = 0;
 893                 var->transp.offset = 0;
 894                 break;
 895         case 32:
 896                 var->red.offset = 16;
 897                 var->green.offset = 8;
 898                 var->blue.offset = 0;
 899                 var->red.length = 8;
 900                 var->green.length = 8;
 901                 var->blue.length = 8;
 902                 var->transp.length = 8;
 903                 var->transp.offset = 24;
 904                 break;
 905         default:
 906                 return -EINVAL;
 907         }
 908         return 0;
 909 }
 910 EXPORT_SYMBOL(drm_fb_helper_check_var);
 911
 912 /**
 913  * drm_fb_helper_set_par - implementation for ->fb_set_par
 914  * @info: fbdev registered by the helper
 915  *
 916  * This will let fbcon do the mode init and is called at initialization time by
 917  * the fbdev core when registering the driver, and later on through the hotplug
 918  * callback.
 919  */
 920 int drm_fb_helper_set_par(struct fb_info *info)
 921 {
 922         struct drm_fb_helper *fb_helper = info->par;
 923         struct fb_var_screeninfo *var = &info->var;
 924
 925         if (var->pixclock != 0) {
 926                 DRM_ERROR("PIXEL CLOCK SET\n");
 927                 return -EINVAL;
 928         }
 929
 930         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 931
 932         return 0;
 933 }
 934 EXPORT_SYMBOL(drm_fb_helper_set_par);
 935
 936 /**
 937  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 938  * @var: updated screen information
 939  * @info: fbdev registered by the helper
 940  */
 941 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 942                               struct fb_info *info)
 943 {
 944         struct drm_fb_helper *fb_helper = info->par;
 945         struct drm_device *dev = fb_helper->dev;
 946         struct drm_mode_set *modeset;
 947         int ret = 0;
 948         int i;
 949
 950         if (__drm_modeset_lock_all(dev, !!oops_in_progress)) {
 951                 return -EBUSY;
 952         }
 953         if (!drm_fb_helper_is_bound(fb_helper)) {
 954                 drm_modeset_unlock_all(dev);
 955                 return -EBUSY;
 956         }
 957
 958         for (i = 0; i < fb_helper->crtc_count; i++) {
 959                 modeset = &fb_helper->crtc_info[i].mode_set;
 960
 961                 modeset->x = var->xoffset;
 962                 modeset->y = var->yoffset;
 963
 964                 if (modeset->num_connectors) {
 965                         ret = drm_mode_set_config_internal(modeset);
 966                         if (!ret) {
 967                                 info->var.xoffset = var->xoffset;
 968                                 info->var.yoffset = var->yoffset;
 969                         }
 970                 }
 971         }
 972         drm_modeset_unlock_all(dev);
 973         return ret;
 974 }
 975 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 976
 977 /*
 978  * Allocates the backing storage and sets up the fbdev info structure through
 979  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 980  * notifier.
 981  */
 982 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 983                                          int preferred_bpp)
 984 {
 985         int ret = 0;
 986         int crtc_count = 0;
 987         int i;
 988         struct fb_info *info;
 989         struct drm_fb_helper_surface_size sizes;
 990         int gamma_size = 0;
 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                 struct drm_mode_set *mode_set;
1038                 int x, y, j;
1039                 /* in case of tile group, are we the last tile vert or horiz?
1040                  * If no tile group you are always the last one both vertically
1041                  * and horizontally
1042                  */
1043                 bool lastv = true, lasth = true;
1044
1045                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1046                 mode_set = &fb_helper->crtc_info[i].mode_set;
1047
1048                 if (!desired_mode)
1049                         continue;
1050
1051                 crtc_count++;
1052
1053                 x = fb_helper->crtc_info[i].x;
1054                 y = fb_helper->crtc_info[i].y;
1055
1056                 if (gamma_size == 0)
1057                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1058
1059                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1060                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1061
1062                 for (j = 0; j < mode_set->num_connectors; j++) {
1063                         struct drm_connector *connector = mode_set->connectors[j];
1064                         if (connector->has_tile) {
1065                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1066                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1067                                 /* cloning to multiple tiles is just crazy-talk, so: */
1068                                 break;
1069                         }
1070                 }
1071
1072                 if (lasth)
1073                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1074                 if (lastv)
1075                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1076         }
1077
1078         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1079                 /* hmm everyone went away - assume VGA cable just fell out
1080                    and will come back later. */
1081                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1082                 sizes.fb_width = sizes.surface_width = 1024;
1083                 sizes.fb_height = sizes.surface_height = 768;
1084         }
1085
1086         /* push down into drivers */
1087         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1088         if (ret < 0)
1089                 return ret;
1090
1091         info = fb_helper->fbdev;
1092
1093         /*
1094          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1095          * events, but at init time drm_setup_crtcs needs to be called before
1096          * the fb is allocated (since we need to figure out the desired size of
1097          * the fb before we can allocate it ...). Hence we need to fix things up
1098          * here again.
1099          */
1100         for (i = 0; i < fb_helper->crtc_count; i++)
1101                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1102                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1103
1104
1105         info->var.pixclock = 0;
1106         if (register_framebuffer(info) < 0)
1107                 return -EINVAL;
1108
1109         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1110                         info->node, info->fix.id);
1111
1112         /* Switch back to kernel console on panic */
1113         /* multi card linked list maybe */
1114         if (list_empty(&kernel_fb_helper_list)) {
1115                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1116                 atomic_notifier_chain_register(&panic_notifier_list,
1117                                                &paniced);
1118                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1119         }
1120
1121         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1122
1123         return 0;
1124 }
1125
1126 /**
1127  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1128  * @info: fbdev registered by the helper
1129  * @pitch: desired pitch
1130  * @depth: desired depth
1131  *
1132  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1133  * fbdev emulations. Drivers which support acceleration methods which impose
1134  * additional constraints need to set up their own limits.
1135  *
1136  * Drivers should call this (or their equivalent setup code) from their
1137  * ->fb_probe callback.
1138  */
1139 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1140                             uint32_t depth)
1141 {
1142         info->fix.type = FB_TYPE_PACKED_PIXELS;
1143         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1144                 FB_VISUAL_TRUECOLOR;
1145         info->fix.mmio_start = 0;
1146         info->fix.mmio_len = 0;
1147         info->fix.type_aux = 0;
1148         info->fix.xpanstep = 1; /* doing it in hw */
1149         info->fix.ypanstep = 1; /* doing it in hw */
1150         info->fix.ywrapstep = 0;
1151         info->fix.accel = FB_ACCEL_NONE;
1152
1153         info->fix.line_length = pitch;
1154         return;
1155 }
1156 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1157
1158 /**
1159  * drm_fb_helper_fill_var - initalizes variable fbdev information
1160  * @info: fbdev instance to set up
1161  * @fb_helper: fb helper instance to use as template
1162  * @fb_width: desired fb width
1163  * @fb_height: desired fb height
1164  *
1165  * Sets up the variable fbdev metainformation from the given fb helper instance
1166  * and the drm framebuffer allocated in fb_helper->fb.
1167  *
1168  * Drivers should call this (or their equivalent setup code) from their
1169  * ->fb_probe callback after having allocated the fbdev backing
1170  * storage framebuffer.
1171  */
1172 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1173                             uint32_t fb_width, uint32_t fb_height)
1174 {
1175         struct drm_framebuffer *fb = fb_helper->fb;
1176         info->pseudo_palette = fb_helper->pseudo_palette;
1177         info->var.xres_virtual = fb->width;
1178         info->var.yres_virtual = fb->height;
1179         info->var.bits_per_pixel = fb->bits_per_pixel;
1180         info->var.accel_flags = FB_ACCELF_TEXT;
1181         info->var.xoffset = 0;
1182         info->var.yoffset = 0;
1183         info->var.activate = FB_ACTIVATE_NOW;
1184         info->var.height = -1;
1185         info->var.width = -1;
1186
1187         switch (fb->depth) {
1188         case 8:
1189                 info->var.red.offset = 0;
1190                 info->var.green.offset = 0;
1191                 info->var.blue.offset = 0;
1192                 info->var.red.length = 8; /* 8bit DAC */
1193                 info->var.green.length = 8;
1194                 info->var.blue.length = 8;
1195                 info->var.transp.offset = 0;
1196                 info->var.transp.length = 0;
1197                 break;
1198         case 15:
1199                 info->var.red.offset = 10;
1200                 info->var.green.offset = 5;
1201                 info->var.blue.offset = 0;
1202                 info->var.red.length = 5;
1203                 info->var.green.length = 5;
1204                 info->var.blue.length = 5;
1205                 info->var.transp.offset = 15;
1206                 info->var.transp.length = 1;
1207                 break;
1208         case 16:
1209                 info->var.red.offset = 11;
1210                 info->var.green.offset = 5;
1211                 info->var.blue.offset = 0;
1212                 info->var.red.length = 5;
1213                 info->var.green.length = 6;
1214                 info->var.blue.length = 5;
1215                 info->var.transp.offset = 0;
1216                 break;
1217         case 24:
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 = 0;
1225                 info->var.transp.length = 0;
1226                 break;
1227         case 32:
1228                 info->var.red.offset = 16;
1229                 info->var.green.offset = 8;
1230                 info->var.blue.offset = 0;
1231                 info->var.red.length = 8;
1232                 info->var.green.length = 8;
1233                 info->var.blue.length = 8;
1234                 info->var.transp.offset = 24;
1235                 info->var.transp.length = 8;
1236                 break;
1237         default:
1238                 break;
1239         }
1240
1241         info->var.xres = fb_width;
1242         info->var.yres = fb_height;
1243 }
1244 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1245
1246 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1247                                                uint32_t maxX,
1248                                                uint32_t maxY)
1249 {
1250         struct drm_connector *connector;
1251         int count = 0;
1252         int i;
1253
1254         for (i = 0; i < fb_helper->connector_count; i++) {
1255                 connector = fb_helper->connector_info[i]->connector;
1256                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1257         }
1258
1259         return count;
1260 }
1261
1262 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1263 {
1264         struct drm_display_mode *mode;
1265
1266         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1267                 if (mode->hdisplay > width ||
1268                     mode->vdisplay > height)
1269                         continue;
1270                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1271                         return mode;
1272         }
1273         return NULL;
1274 }
1275 EXPORT_SYMBOL(drm_has_preferred_mode);
1276
1277 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1278 {
1279         return fb_connector->connector->cmdline_mode.specified;
1280 }
1281
1282 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1283                                                       int width, int height)
1284 {
1285         struct drm_cmdline_mode *cmdline_mode;
1286         struct drm_display_mode *mode;
1287         bool prefer_non_interlace;
1288
1289         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1290         if (cmdline_mode->specified == false)
1291                 return NULL;
1292
1293         /* attempt to find a matching mode in the list of modes
1294          *  we have gotten so far, if not add a CVT mode that conforms
1295          */
1296         if (cmdline_mode->rb || cmdline_mode->margins)
1297                 goto create_mode;
1298
1299         prefer_non_interlace = !cmdline_mode->interlace;
1300 again:
1301         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1302                 /* check width/height */
1303                 if (mode->hdisplay != cmdline_mode->xres ||
1304                     mode->vdisplay != cmdline_mode->yres)
1305                         continue;
1306
1307                 if (cmdline_mode->refresh_specified) {
1308                         if (mode->vrefresh != cmdline_mode->refresh)
1309                                 continue;
1310                 }
1311
1312                 if (cmdline_mode->interlace) {
1313                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1314                                 continue;
1315                 } else if (prefer_non_interlace) {
1316                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1317                                 continue;
1318                 }
1319                 return mode;
1320         }
1321
1322         if (prefer_non_interlace) {
1323                 prefer_non_interlace = false;
1324                 goto again;
1325         }
1326
1327 create_mode:
1328         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1329                                                  cmdline_mode);
1330         list_add(&mode->head, &fb_helper_conn->connector->modes);
1331         return mode;
1332 }
1333 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1334
1335 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1336 {
1337         bool enable;
1338
1339         if (strict)
1340                 enable = connector->status == connector_status_connected;
1341         else
1342                 enable = connector->status != connector_status_disconnected;
1343
1344         return enable;
1345 }
1346
1347 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1348                                   bool *enabled)
1349 {
1350         bool any_enabled = false;
1351         struct drm_connector *connector;
1352         int i = 0;
1353
1354         for (i = 0; i < fb_helper->connector_count; i++) {
1355                 connector = fb_helper->connector_info[i]->connector;
1356                 enabled[i] = drm_connector_enabled(connector, true);
1357                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1358                           enabled[i] ? "yes" : "no");
1359                 any_enabled |= enabled[i];
1360         }
1361
1362         if (any_enabled)
1363                 return;
1364
1365         for (i = 0; i < fb_helper->connector_count; i++) {
1366                 connector = fb_helper->connector_info[i]->connector;
1367                 enabled[i] = drm_connector_enabled(connector, false);
1368         }
1369 }
1370
1371 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1372                               struct drm_display_mode **modes,
1373                               struct drm_fb_offset *offsets,
1374                               bool *enabled, int width, int height)
1375 {
1376         int count, i, j;
1377         bool can_clone = false;
1378         struct drm_fb_helper_connector *fb_helper_conn;
1379         struct drm_display_mode *dmt_mode, *mode;
1380
1381         /* only contemplate cloning in the single crtc case */
1382         if (fb_helper->crtc_count > 1)
1383                 return false;
1384
1385         count = 0;
1386         for (i = 0; i < fb_helper->connector_count; i++) {
1387                 if (enabled[i])
1388                         count++;
1389         }
1390
1391         /* only contemplate cloning if more than one connector is enabled */
1392         if (count <= 1)
1393                 return false;
1394
1395         /* check the command line or if nothing common pick 1024x768 */
1396         can_clone = true;
1397         for (i = 0; i < fb_helper->connector_count; i++) {
1398                 if (!enabled[i])
1399                         continue;
1400                 fb_helper_conn = fb_helper->connector_info[i];
1401                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1402                 if (!modes[i]) {
1403                         can_clone = false;
1404                         break;
1405                 }
1406                 for (j = 0; j < i; j++) {
1407                         if (!enabled[j])
1408                                 continue;
1409                         if (!drm_mode_equal(modes[j], modes[i]))
1410                                 can_clone = false;
1411                 }
1412         }
1413
1414         if (can_clone) {
1415                 DRM_DEBUG_KMS("can clone using command line\n");
1416                 return true;
1417         }
1418
1419         /* try and find a 1024x768 mode on each connector */
1420         can_clone = true;
1421         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1422
1423         for (i = 0; i < fb_helper->connector_count; i++) {
1424
1425                 if (!enabled[i])
1426                         continue;
1427
1428                 fb_helper_conn = fb_helper->connector_info[i];
1429                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1430                         if (drm_mode_equal(mode, dmt_mode))
1431                                 modes[i] = mode;
1432                 }
1433                 if (!modes[i])
1434                         can_clone = false;
1435         }
1436
1437         if (can_clone) {
1438                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1439                 return true;
1440         }
1441         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1442         return false;
1443 }
1444
1445 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1446                                 struct drm_display_mode **modes,
1447                                 struct drm_fb_offset *offsets,
1448                                 int idx,
1449                                 int h_idx, int v_idx)
1450 {
1451         struct drm_fb_helper_connector *fb_helper_conn;
1452         int i;
1453         int hoffset = 0, voffset = 0;
1454
1455         for (i = 0; i < fb_helper->connector_count; i++) {
1456                 fb_helper_conn = fb_helper->connector_info[i];
1457                 if (!fb_helper_conn->connector->has_tile)
1458                         continue;
1459
1460                 if (!modes[i] && (h_idx || v_idx)) {
1461                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1462                                       fb_helper_conn->connector->base.id);
1463                         continue;
1464                 }
1465                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1466                         hoffset += modes[i]->hdisplay;
1467
1468                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1469                         voffset += modes[i]->vdisplay;
1470         }
1471         offsets[idx].x = hoffset;
1472         offsets[idx].y = voffset;
1473         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1474         return 0;
1475 }
1476
1477 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1478                                  struct drm_display_mode **modes,
1479                                  struct drm_fb_offset *offsets,
1480                                  bool *enabled, int width, int height)
1481 {
1482         struct drm_fb_helper_connector *fb_helper_conn;
1483         int i;
1484         uint64_t conn_configured = 0, mask;
1485         int tile_pass = 0;
1486         mask = (1 << fb_helper->connector_count) - 1;
1487 retry:
1488         for (i = 0; i < fb_helper->connector_count; i++) {
1489                 fb_helper_conn = fb_helper->connector_info[i];
1490
1491                 if (conn_configured & (1 << i))
1492                         continue;
1493
1494                 if (enabled[i] == false) {
1495                         conn_configured |= (1 << i);
1496                         continue;
1497                 }
1498
1499                 /* first pass over all the untiled connectors */
1500                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1501                         continue;
1502
1503                 if (tile_pass == 1) {
1504                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1505                             fb_helper_conn->connector->tile_v_loc != 0)
1506                                 continue;
1507
1508                 } else {
1509                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1510                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1511                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1512                                 continue;
1513
1514                         /* find the tile offsets for this pass - need
1515                            to find all tiles left and above */
1516                         drm_get_tile_offsets(fb_helper, modes, offsets,
1517                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1518                 }
1519                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1520                               fb_helper_conn->connector->base.id);
1521
1522                 /* got for command line mode first */
1523                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1524                 if (!modes[i]) {
1525                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1526                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1527                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1528                 }
1529                 /* No preferred modes, pick one off the list */
1530                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1531                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1532                                 break;
1533                 }
1534                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1535                           "none");
1536                 conn_configured |= (1 << i);
1537         }
1538
1539         if ((conn_configured & mask) != mask) {
1540                 tile_pass++;
1541                 goto retry;
1542         }
1543         return true;
1544 }
1545
1546 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1547                           struct drm_fb_helper_crtc **best_crtcs,
1548                           struct drm_display_mode **modes,
1549                           int n, int width, int height)
1550 {
1551         int c, o;
1552         struct drm_device *dev = fb_helper->dev;
1553         struct drm_connector *connector;
1554         const struct drm_connector_helper_funcs *connector_funcs;
1555         struct drm_encoder *encoder;
1556         int my_score, best_score, score;
1557         struct drm_fb_helper_crtc **crtcs, *crtc;
1558         struct drm_fb_helper_connector *fb_helper_conn;
1559
1560         if (n == fb_helper->connector_count)
1561                 return 0;
1562
1563         fb_helper_conn = fb_helper->connector_info[n];
1564         connector = fb_helper_conn->connector;
1565
1566         best_crtcs[n] = NULL;
1567         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1568         if (modes[n] == NULL)
1569                 return best_score;
1570
1571         crtcs = kzalloc(dev->mode_config.num_connector *
1572                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1573         if (!crtcs)
1574                 return best_score;
1575
1576         my_score = 1;
1577         if (connector->status == connector_status_connected)
1578                 my_score++;
1579         if (drm_has_cmdline_mode(fb_helper_conn))
1580                 my_score++;
1581         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1582                 my_score++;
1583
1584         connector_funcs = connector->helper_private;
1585         encoder = connector_funcs->best_encoder(connector);
1586         if (!encoder)
1587                 goto out;
1588
1589         /* select a crtc for this connector and then attempt to configure
1590            remaining connectors */
1591         for (c = 0; c < fb_helper->crtc_count; c++) {
1592                 crtc = &fb_helper->crtc_info[c];
1593
1594                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1595                         continue;
1596
1597                 for (o = 0; o < n; o++)
1598                         if (best_crtcs[o] == crtc)
1599                                 break;
1600
1601                 if (o < n) {
1602                         /* ignore cloning unless only a single crtc */
1603                         if (fb_helper->crtc_count > 1)
1604                                 continue;
1605
1606                         if (!drm_mode_equal(modes[o], modes[n]))
1607                                 continue;
1608                 }
1609
1610                 crtcs[n] = crtc;
1611                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1612                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1613                                                   width, height);
1614                 if (score > best_score) {
1615                         best_score = score;
1616                         memcpy(best_crtcs, crtcs,
1617                                dev->mode_config.num_connector *
1618                                sizeof(struct drm_fb_helper_crtc *));
1619                 }
1620         }
1621 out:
1622         kfree(crtcs);
1623         return best_score;
1624 }
1625
1626 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1627 {
1628         struct drm_device *dev = fb_helper->dev;
1629         struct drm_fb_helper_crtc **crtcs;
1630         struct drm_display_mode **modes;
1631         struct drm_fb_offset *offsets;
1632         struct drm_mode_set *modeset;
1633         bool *enabled;
1634         int width, height;
1635         int i;
1636
1637         DRM_DEBUG_KMS("\n");
1638
1639         width = dev->mode_config.max_width;
1640         height = dev->mode_config.max_height;
1641
1642         crtcs = kcalloc(dev->mode_config.num_connector,
1643                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1644         modes = kcalloc(dev->mode_config.num_connector,
1645                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1646         offsets = kcalloc(dev->mode_config.num_connector,
1647                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1648         enabled = kcalloc(dev->mode_config.num_connector,
1649                           sizeof(bool), GFP_KERNEL);
1650         if (!crtcs || !modes || !enabled || !offsets) {
1651                 DRM_ERROR("Memory allocation failed\n");
1652                 goto out;
1653         }
1654
1655
1656         drm_enable_connectors(fb_helper, enabled);
1657
1658         if (!(fb_helper->funcs->initial_config &&
1659               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1660                                                offsets,
1661                                                enabled, width, height))) {
1662                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1663                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1664                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1665
1666                 if (!drm_target_cloned(fb_helper, modes, offsets,
1667                                        enabled, width, height) &&
1668                     !drm_target_preferred(fb_helper, modes, offsets,
1669                                           enabled, width, height))
1670                         DRM_ERROR("Unable to find initial modes\n");
1671
1672                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1673                               width, height);
1674
1675                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1676         }
1677
1678         /* need to set the modesets up here for use later */
1679         /* fill out the connector<->crtc mappings into the modesets */
1680         for (i = 0; i < fb_helper->crtc_count; i++) {
1681                 modeset = &fb_helper->crtc_info[i].mode_set;
1682                 modeset->num_connectors = 0;
1683                 modeset->fb = NULL;
1684         }
1685
1686         for (i = 0; i < fb_helper->connector_count; i++) {
1687                 struct drm_display_mode *mode = modes[i];
1688                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1689                 struct drm_fb_offset *offset = &offsets[i];
1690                 modeset = &fb_crtc->mode_set;
1691
1692                 if (mode && fb_crtc) {
1693                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1694                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1695                         fb_crtc->desired_mode = mode;
1696                         fb_crtc->x = offset->x;
1697                         fb_crtc->y = offset->y;
1698                         if (modeset->mode)
1699                                 drm_mode_destroy(dev, modeset->mode);
1700                         modeset->mode = drm_mode_duplicate(dev,
1701                                                            fb_crtc->desired_mode);
1702                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1703                         modeset->fb = fb_helper->fb;
1704                         modeset->x = offset->x;
1705                         modeset->y = offset->y;
1706                 }
1707         }
1708
1709         /* Clear out any old modes if there are no more connected outputs. */
1710         for (i = 0; i < fb_helper->crtc_count; i++) {
1711                 modeset = &fb_helper->crtc_info[i].mode_set;
1712                 if (modeset->num_connectors == 0) {
1713                         BUG_ON(modeset->fb);
1714                         if (modeset->mode)
1715                                 drm_mode_destroy(dev, modeset->mode);
1716                         modeset->mode = NULL;
1717                 }
1718         }
1719 out:
1720         kfree(crtcs);
1721         kfree(modes);
1722         kfree(offsets);
1723         kfree(enabled);
1724 }
1725
1726 /**
1727  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1728  * @fb_helper: fb_helper device struct
1729  * @bpp_sel: bpp value to use for the framebuffer configuration
1730  *
1731  * Scans the CRTCs and connectors and tries to put together an initial setup.
1732  * At the moment, this is a cloned configuration across all heads with
1733  * a new framebuffer object as the backing store.
1734  *
1735  * Note that this also registers the fbdev and so allows userspace to call into
1736  * the driver through the fbdev interfaces.
1737  *
1738  * This function will call down into the ->fb_probe callback to let
1739  * the driver allocate and initialize the fbdev info structure and the drm
1740  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1741  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1742  * values for the fbdev info structure.
1743  *
1744  * RETURNS:
1745  * Zero if everything went ok, nonzero otherwise.
1746  */
1747 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1748 {
1749         struct drm_device *dev = fb_helper->dev;
1750         int count = 0;
1751
1752         mutex_lock(&dev->mode_config.mutex);
1753         count = drm_fb_helper_probe_connector_modes(fb_helper,
1754                                                     dev->mode_config.max_width,
1755                                                     dev->mode_config.max_height);
1756         mutex_unlock(&dev->mode_config.mutex);
1757         /*
1758          * we shouldn't end up with no modes here.
1759          */
1760         if (count == 0)
1761                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1762
1763         drm_setup_crtcs(fb_helper);
1764
1765         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1766 }
1767 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1768
1769 /**
1770  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1771  *                               probing all the outputs attached to the fb
1772  * @fb_helper: the drm_fb_helper
1773  *
1774  * Scan the connectors attached to the fb_helper and try to put together a
1775  * setup after *notification of a change in output configuration.
1776  *
1777  * Called at runtime, takes the mode config locks to be able to check/change the
1778  * modeset configuration. Must be run from process context (which usually means
1779  * either the output polling work or a work item launched from the driver's
1780  * hotplug interrupt).
1781  *
1782  * Note that drivers may call this even before calling
1783  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1784  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1785  * not miss any hotplug events.
1786  *
1787  * RETURNS:
1788  * 0 on success and a non-zero error code otherwise.
1789  */
1790 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1791 {
1792         struct drm_device *dev = fb_helper->dev;
1793         u32 max_width, max_height;
1794
1795         mutex_lock(&fb_helper->dev->mode_config.mutex);
1796         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1797                 fb_helper->delayed_hotplug = true;
1798                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1799                 return 0;
1800         }
1801         DRM_DEBUG_KMS("\n");
1802
1803         max_width = fb_helper->fb->width;
1804         max_height = fb_helper->fb->height;
1805
1806         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1807         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1808
1809         drm_modeset_lock_all(dev);
1810         drm_setup_crtcs(fb_helper);
1811         drm_modeset_unlock_all(dev);
1812         drm_fb_helper_set_par(fb_helper->fbdev);
1813
1814         return 0;
1815 }
1816 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1817
1818 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1819  * but the module doesn't depend on any fb console symbols.  At least
1820  * attempt to load fbcon to avoid leaving the system without a usable console.
1821  */
1822 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1823 static int __init drm_fb_helper_modinit(void)
1824 {
1825         const char *name = "fbcon";
1826         struct module *fbcon;
1827
1828         mutex_lock(&module_mutex);
1829         fbcon = find_module(name);
1830         mutex_unlock(&module_mutex);
1831
1832         if (!fbcon)
1833                 request_module_nowait(name);
1834         return 0;
1835 }
1836
1837 module_init(drm_fb_helper_modinit);
1838 #endif