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         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         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         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                 int x, y;
1038                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1039                 x = fb_helper->crtc_info[i].x;
1040                 y = fb_helper->crtc_info[i].y;
1041                 if (desired_mode) {
1042                         if (gamma_size == 0)
1043                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1044                         if (desired_mode->hdisplay + x < sizes.fb_width)
1045                                 sizes.fb_width = desired_mode->hdisplay + x;
1046                         if (desired_mode->vdisplay + y < sizes.fb_height)
1047                                 sizes.fb_height = desired_mode->vdisplay + y;
1048                         if (desired_mode->hdisplay + x > sizes.surface_width)
1049                                 sizes.surface_width = desired_mode->hdisplay + x;
1050                         if (desired_mode->vdisplay + y > sizes.surface_height)
1051                                 sizes.surface_height = desired_mode->vdisplay + y;
1052                         crtc_count++;
1053                 }
1054         }
1055
1056         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1057                 /* hmm everyone went away - assume VGA cable just fell out
1058                    and will come back later. */
1059                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1060                 sizes.fb_width = sizes.surface_width = 1024;
1061                 sizes.fb_height = sizes.surface_height = 768;
1062         }
1063
1064         /* push down into drivers */
1065         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1066         if (ret < 0)
1067                 return ret;
1068
1069         info = fb_helper->fbdev;
1070
1071         /*
1072          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1073          * events, but at init time drm_setup_crtcs needs to be called before
1074          * the fb is allocated (since we need to figure out the desired size of
1075          * the fb before we can allocate it ...). Hence we need to fix things up
1076          * here again.
1077          */
1078         for (i = 0; i < fb_helper->crtc_count; i++)
1079                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1080                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1081
1082
1083         info->var.pixclock = 0;
1084         if (register_framebuffer(info) < 0)
1085                 return -EINVAL;
1086
1087         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1088                         info->node, info->fix.id);
1089
1090         /* Switch back to kernel console on panic */
1091         /* multi card linked list maybe */
1092         if (list_empty(&kernel_fb_helper_list)) {
1093                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1094                 atomic_notifier_chain_register(&panic_notifier_list,
1095                                                &paniced);
1096                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1097         }
1098
1099         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1100
1101         return 0;
1102 }
1103
1104 /**
1105  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1106  * @info: fbdev registered by the helper
1107  * @pitch: desired pitch
1108  * @depth: desired depth
1109  *
1110  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1111  * fbdev emulations. Drivers which support acceleration methods which impose
1112  * additional constraints need to set up their own limits.
1113  *
1114  * Drivers should call this (or their equivalent setup code) from their
1115  * ->fb_probe callback.
1116  */
1117 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1118                             uint32_t depth)
1119 {
1120         info->fix.type = FB_TYPE_PACKED_PIXELS;
1121         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1122                 FB_VISUAL_TRUECOLOR;
1123         info->fix.mmio_start = 0;
1124         info->fix.mmio_len = 0;
1125         info->fix.type_aux = 0;
1126         info->fix.xpanstep = 1; /* doing it in hw */
1127         info->fix.ypanstep = 1; /* doing it in hw */
1128         info->fix.ywrapstep = 0;
1129         info->fix.accel = FB_ACCEL_NONE;
1130
1131         info->fix.line_length = pitch;
1132         return;
1133 }
1134 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1135
1136 /**
1137  * drm_fb_helper_fill_var - initalizes variable fbdev information
1138  * @info: fbdev instance to set up
1139  * @fb_helper: fb helper instance to use as template
1140  * @fb_width: desired fb width
1141  * @fb_height: desired fb height
1142  *
1143  * Sets up the variable fbdev metainformation from the given fb helper instance
1144  * and the drm framebuffer allocated in fb_helper->fb.
1145  *
1146  * Drivers should call this (or their equivalent setup code) from their
1147  * ->fb_probe callback after having allocated the fbdev backing
1148  * storage framebuffer.
1149  */
1150 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1151                             uint32_t fb_width, uint32_t fb_height)
1152 {
1153         struct drm_framebuffer *fb = fb_helper->fb;
1154         info->pseudo_palette = fb_helper->pseudo_palette;
1155         info->var.xres_virtual = fb->width;
1156         info->var.yres_virtual = fb->height;
1157         info->var.bits_per_pixel = fb->bits_per_pixel;
1158         info->var.accel_flags = FB_ACCELF_TEXT;
1159         info->var.xoffset = 0;
1160         info->var.yoffset = 0;
1161         info->var.activate = FB_ACTIVATE_NOW;
1162         info->var.height = -1;
1163         info->var.width = -1;
1164
1165         switch (fb->depth) {
1166         case 8:
1167                 info->var.red.offset = 0;
1168                 info->var.green.offset = 0;
1169                 info->var.blue.offset = 0;
1170                 info->var.red.length = 8; /* 8bit DAC */
1171                 info->var.green.length = 8;
1172                 info->var.blue.length = 8;
1173                 info->var.transp.offset = 0;
1174                 info->var.transp.length = 0;
1175                 break;
1176         case 15:
1177                 info->var.red.offset = 10;
1178                 info->var.green.offset = 5;
1179                 info->var.blue.offset = 0;
1180                 info->var.red.length = 5;
1181                 info->var.green.length = 5;
1182                 info->var.blue.length = 5;
1183                 info->var.transp.offset = 15;
1184                 info->var.transp.length = 1;
1185                 break;
1186         case 16:
1187                 info->var.red.offset = 11;
1188                 info->var.green.offset = 5;
1189                 info->var.blue.offset = 0;
1190                 info->var.red.length = 5;
1191                 info->var.green.length = 6;
1192                 info->var.blue.length = 5;
1193                 info->var.transp.offset = 0;
1194                 break;
1195         case 24:
1196                 info->var.red.offset = 16;
1197                 info->var.green.offset = 8;
1198                 info->var.blue.offset = 0;
1199                 info->var.red.length = 8;
1200                 info->var.green.length = 8;
1201                 info->var.blue.length = 8;
1202                 info->var.transp.offset = 0;
1203                 info->var.transp.length = 0;
1204                 break;
1205         case 32:
1206                 info->var.red.offset = 16;
1207                 info->var.green.offset = 8;
1208                 info->var.blue.offset = 0;
1209                 info->var.red.length = 8;
1210                 info->var.green.length = 8;
1211                 info->var.blue.length = 8;
1212                 info->var.transp.offset = 24;
1213                 info->var.transp.length = 8;
1214                 break;
1215         default:
1216                 break;
1217         }
1218
1219         info->var.xres = fb_width;
1220         info->var.yres = fb_height;
1221 }
1222 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1223
1224 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1225                                                uint32_t maxX,
1226                                                uint32_t maxY)
1227 {
1228         struct drm_connector *connector;
1229         int count = 0;
1230         int i;
1231
1232         for (i = 0; i < fb_helper->connector_count; i++) {
1233                 connector = fb_helper->connector_info[i]->connector;
1234                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1235         }
1236
1237         return count;
1238 }
1239
1240 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1241 {
1242         struct drm_display_mode *mode;
1243
1244         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1245                 if (mode->hdisplay > width ||
1246                     mode->vdisplay > height)
1247                         continue;
1248                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1249                         return mode;
1250         }
1251         return NULL;
1252 }
1253 EXPORT_SYMBOL(drm_has_preferred_mode);
1254
1255 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1256 {
1257         return fb_connector->connector->cmdline_mode.specified;
1258 }
1259
1260 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1261                                                       int width, int height)
1262 {
1263         struct drm_cmdline_mode *cmdline_mode;
1264         struct drm_display_mode *mode = NULL;
1265         bool prefer_non_interlace;
1266
1267         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1268         if (cmdline_mode->specified == false)
1269                 return mode;
1270
1271         /* attempt to find a matching mode in the list of modes
1272          *  we have gotten so far, if not add a CVT mode that conforms
1273          */
1274         if (cmdline_mode->rb || cmdline_mode->margins)
1275                 goto create_mode;
1276
1277         prefer_non_interlace = !cmdline_mode->interlace;
1278  again:
1279         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1280                 /* check width/height */
1281                 if (mode->hdisplay != cmdline_mode->xres ||
1282                     mode->vdisplay != cmdline_mode->yres)
1283                         continue;
1284
1285                 if (cmdline_mode->refresh_specified) {
1286                         if (mode->vrefresh != cmdline_mode->refresh)
1287                                 continue;
1288                 }
1289
1290                 if (cmdline_mode->interlace) {
1291                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1292                                 continue;
1293                 } else if (prefer_non_interlace) {
1294                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1295                                 continue;
1296                 }
1297                 return mode;
1298         }
1299
1300         if (prefer_non_interlace) {
1301                 prefer_non_interlace = false;
1302                 goto again;
1303         }
1304
1305 create_mode:
1306         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1307                                                  cmdline_mode);
1308         list_add(&mode->head, &fb_helper_conn->connector->modes);
1309         return mode;
1310 }
1311 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1312
1313 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1314 {
1315         bool enable;
1316
1317         if (strict)
1318                 enable = connector->status == connector_status_connected;
1319         else
1320                 enable = connector->status != connector_status_disconnected;
1321
1322         return enable;
1323 }
1324
1325 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1326                                   bool *enabled)
1327 {
1328         bool any_enabled = false;
1329         struct drm_connector *connector;
1330         int i = 0;
1331
1332         for (i = 0; i < fb_helper->connector_count; i++) {
1333                 connector = fb_helper->connector_info[i]->connector;
1334                 enabled[i] = drm_connector_enabled(connector, true);
1335                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1336                           enabled[i] ? "yes" : "no");
1337                 any_enabled |= enabled[i];
1338         }
1339
1340         if (any_enabled)
1341                 return;
1342
1343         for (i = 0; i < fb_helper->connector_count; i++) {
1344                 connector = fb_helper->connector_info[i]->connector;
1345                 enabled[i] = drm_connector_enabled(connector, false);
1346         }
1347 }
1348
1349 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1350                               struct drm_display_mode **modes,
1351                               struct drm_fb_offset *offsets,
1352                               bool *enabled, int width, int height)
1353 {
1354         int count, i, j;
1355         bool can_clone = false;
1356         struct drm_fb_helper_connector *fb_helper_conn;
1357         struct drm_display_mode *dmt_mode, *mode;
1358
1359         /* only contemplate cloning in the single crtc case */
1360         if (fb_helper->crtc_count > 1)
1361                 return false;
1362
1363         count = 0;
1364         for (i = 0; i < fb_helper->connector_count; i++) {
1365                 if (enabled[i])
1366                         count++;
1367         }
1368
1369         /* only contemplate cloning if more than one connector is enabled */
1370         if (count <= 1)
1371                 return false;
1372
1373         /* check the command line or if nothing common pick 1024x768 */
1374         can_clone = true;
1375         for (i = 0; i < fb_helper->connector_count; i++) {
1376                 if (!enabled[i])
1377                         continue;
1378                 fb_helper_conn = fb_helper->connector_info[i];
1379                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1380                 if (!modes[i]) {
1381                         can_clone = false;
1382                         break;
1383                 }
1384                 for (j = 0; j < i; j++) {
1385                         if (!enabled[j])
1386                                 continue;
1387                         if (!drm_mode_equal(modes[j], modes[i]))
1388                                 can_clone = false;
1389                 }
1390         }
1391
1392         if (can_clone) {
1393                 DRM_DEBUG_KMS("can clone using command line\n");
1394                 return true;
1395         }
1396
1397         /* try and find a 1024x768 mode on each connector */
1398         can_clone = true;
1399         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1400
1401         for (i = 0; i < fb_helper->connector_count; i++) {
1402
1403                 if (!enabled[i])
1404                         continue;
1405
1406                 fb_helper_conn = fb_helper->connector_info[i];
1407                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1408                         if (drm_mode_equal(mode, dmt_mode))
1409                                 modes[i] = mode;
1410                 }
1411                 if (!modes[i])
1412                         can_clone = false;
1413         }
1414
1415         if (can_clone) {
1416                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1417                 return true;
1418         }
1419         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1420         return false;
1421 }
1422
1423 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1424                                 struct drm_display_mode **modes,
1425                                 struct drm_fb_offset *offsets,
1426                                 int idx,
1427                                 int h_idx, int v_idx)
1428 {
1429         struct drm_fb_helper_connector *fb_helper_conn;
1430         int i;
1431         int hoffset = 0, voffset = 0;
1432
1433         for (i = 0; i < fb_helper->connector_count; i++) {
1434                 fb_helper_conn = fb_helper->connector_info[i];
1435                 if (!fb_helper_conn->connector->has_tile)
1436                         continue;
1437
1438                 if (!modes[i] && (h_idx || v_idx)) {
1439                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1440                                       fb_helper_conn->connector->base.id);
1441                         continue;
1442                 }
1443                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1444                         hoffset += modes[i]->hdisplay;
1445
1446                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1447                         voffset += modes[i]->vdisplay;
1448         }
1449         offsets[idx].x = hoffset;
1450         offsets[idx].y = voffset;
1451         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1452         return 0;
1453 }
1454
1455 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1456                                  struct drm_display_mode **modes,
1457                                  struct drm_fb_offset *offsets,
1458                                  bool *enabled, int width, int height)
1459 {
1460         struct drm_fb_helper_connector *fb_helper_conn;
1461         int i;
1462         uint64_t conn_configured = 0, mask;
1463         int tile_pass = 0;
1464         mask = (1 << fb_helper->connector_count) - 1;
1465 retry:
1466         for (i = 0; i < fb_helper->connector_count; i++) {
1467                 fb_helper_conn = fb_helper->connector_info[i];
1468
1469                 if (conn_configured & (1 << i))
1470                         continue;
1471
1472                 if (enabled[i] == false) {
1473                         conn_configured |= (1 << i);
1474                         continue;
1475                 }
1476
1477                 /* first pass over all the untiled connectors */
1478                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1479                         continue;
1480
1481                 if (tile_pass == 1) {
1482                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1483                             fb_helper_conn->connector->tile_v_loc != 0)
1484                                 continue;
1485
1486                 } else {
1487                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1488                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1489                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1490                                 continue;
1491
1492                         /* find the tile offsets for this pass - need
1493                            to find all tiles left and above */
1494                         drm_get_tile_offsets(fb_helper, modes, offsets,
1495                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1496                 }
1497                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1498                               fb_helper_conn->connector->base.id);
1499
1500                 /* got for command line mode first */
1501                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1502                 if (!modes[i]) {
1503                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1504                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1505                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1506                 }
1507                 /* No preferred modes, pick one off the list */
1508                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1509                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1510                                 break;
1511                 }
1512                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1513                           "none");
1514                 conn_configured |= (1 << i);
1515         }
1516
1517         if ((conn_configured & mask) != mask) {
1518                 tile_pass++;
1519                 goto retry;
1520         }
1521         return true;
1522 }
1523
1524 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1525                           struct drm_fb_helper_crtc **best_crtcs,
1526                           struct drm_display_mode **modes,
1527                           int n, int width, int height)
1528 {
1529         int c, o;
1530         struct drm_device *dev = fb_helper->dev;
1531         struct drm_connector *connector;
1532         struct drm_connector_helper_funcs *connector_funcs;
1533         struct drm_encoder *encoder;
1534         int my_score, best_score, score;
1535         struct drm_fb_helper_crtc **crtcs, *crtc;
1536         struct drm_fb_helper_connector *fb_helper_conn;
1537
1538         if (n == fb_helper->connector_count)
1539                 return 0;
1540
1541         fb_helper_conn = fb_helper->connector_info[n];
1542         connector = fb_helper_conn->connector;
1543
1544         best_crtcs[n] = NULL;
1545         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1546         if (modes[n] == NULL)
1547                 return best_score;
1548
1549         crtcs = kzalloc(dev->mode_config.num_connector *
1550                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1551         if (!crtcs)
1552                 return best_score;
1553
1554         my_score = 1;
1555         if (connector->status == connector_status_connected)
1556                 my_score++;
1557         if (drm_has_cmdline_mode(fb_helper_conn))
1558                 my_score++;
1559         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1560                 my_score++;
1561
1562         connector_funcs = connector->helper_private;
1563         encoder = connector_funcs->best_encoder(connector);
1564         if (!encoder)
1565                 goto out;
1566
1567         /* select a crtc for this connector and then attempt to configure
1568            remaining connectors */
1569         for (c = 0; c < fb_helper->crtc_count; c++) {
1570                 crtc = &fb_helper->crtc_info[c];
1571
1572                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1573                         continue;
1574
1575                 for (o = 0; o < n; o++)
1576                         if (best_crtcs[o] == crtc)
1577                                 break;
1578
1579                 if (o < n) {
1580                         /* ignore cloning unless only a single crtc */
1581                         if (fb_helper->crtc_count > 1)
1582                                 continue;
1583
1584                         if (!drm_mode_equal(modes[o], modes[n]))
1585                                 continue;
1586                 }
1587
1588                 crtcs[n] = crtc;
1589                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1590                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1591                                                   width, height);
1592                 if (score > best_score) {
1593                         best_score = score;
1594                         memcpy(best_crtcs, crtcs,
1595                                dev->mode_config.num_connector *
1596                                sizeof(struct drm_fb_helper_crtc *));
1597                 }
1598         }
1599 out:
1600         kfree(crtcs);
1601         return best_score;
1602 }
1603
1604 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1605 {
1606         struct drm_device *dev = fb_helper->dev;
1607         struct drm_fb_helper_crtc **crtcs;
1608         struct drm_display_mode **modes;
1609         struct drm_fb_offset *offsets;
1610         struct drm_mode_set *modeset;
1611         bool *enabled;
1612         int width, height;
1613         int i;
1614
1615         DRM_DEBUG_KMS("\n");
1616
1617         width = dev->mode_config.max_width;
1618         height = dev->mode_config.max_height;
1619
1620         crtcs = kcalloc(dev->mode_config.num_connector,
1621                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1622         modes = kcalloc(dev->mode_config.num_connector,
1623                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1624         offsets = kcalloc(dev->mode_config.num_connector,
1625                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1626         enabled = kcalloc(dev->mode_config.num_connector,
1627                           sizeof(bool), GFP_KERNEL);
1628         if (!crtcs || !modes || !enabled || !offsets) {
1629                 DRM_ERROR("Memory allocation failed\n");
1630                 goto out;
1631         }
1632
1633
1634         drm_enable_connectors(fb_helper, enabled);
1635
1636         if (!(fb_helper->funcs->initial_config &&
1637               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1638                                                offsets,
1639                                                enabled, width, height))) {
1640                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1641                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1642                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1643
1644                 if (!drm_target_cloned(fb_helper, modes, offsets,
1645                                        enabled, width, height) &&
1646                     !drm_target_preferred(fb_helper, modes, offsets,
1647                                           enabled, width, height))
1648                         DRM_ERROR("Unable to find initial modes\n");
1649
1650                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1651                               width, height);
1652
1653                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1654         }
1655
1656         /* need to set the modesets up here for use later */
1657         /* fill out the connector<->crtc mappings into the modesets */
1658         for (i = 0; i < fb_helper->crtc_count; i++) {
1659                 modeset = &fb_helper->crtc_info[i].mode_set;
1660                 modeset->num_connectors = 0;
1661                 modeset->fb = NULL;
1662         }
1663
1664         for (i = 0; i < fb_helper->connector_count; i++) {
1665                 struct drm_display_mode *mode = modes[i];
1666                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1667                 struct drm_fb_offset *offset = &offsets[i];
1668                 modeset = &fb_crtc->mode_set;
1669
1670                 if (mode && fb_crtc) {
1671                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1672                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1673                         fb_crtc->desired_mode = mode;
1674                         fb_crtc->x = offset->x;
1675                         fb_crtc->y = offset->y;
1676                         if (modeset->mode)
1677                                 drm_mode_destroy(dev, modeset->mode);
1678                         modeset->mode = drm_mode_duplicate(dev,
1679                                                            fb_crtc->desired_mode);
1680                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1681                         modeset->fb = fb_helper->fb;
1682                         modeset->x = offset->x;
1683                         modeset->y = offset->y;
1684                 }
1685         }
1686
1687         /* Clear out any old modes if there are no more connected outputs. */
1688         for (i = 0; i < fb_helper->crtc_count; i++) {
1689                 modeset = &fb_helper->crtc_info[i].mode_set;
1690                 if (modeset->num_connectors == 0) {
1691                         BUG_ON(modeset->fb);
1692                         if (modeset->mode)
1693                                 drm_mode_destroy(dev, modeset->mode);
1694                         modeset->mode = NULL;
1695                 }
1696         }
1697 out:
1698         kfree(crtcs);
1699         kfree(modes);
1700         kfree(offsets);
1701         kfree(enabled);
1702 }
1703
1704 /**
1705  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1706  * @fb_helper: fb_helper device struct
1707  * @bpp_sel: bpp value to use for the framebuffer configuration
1708  *
1709  * Scans the CRTCs and connectors and tries to put together an initial setup.
1710  * At the moment, this is a cloned configuration across all heads with
1711  * a new framebuffer object as the backing store.
1712  *
1713  * Note that this also registers the fbdev and so allows userspace to call into
1714  * the driver through the fbdev interfaces.
1715  *
1716  * This function will call down into the ->fb_probe callback to let
1717  * the driver allocate and initialize the fbdev info structure and the drm
1718  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1719  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1720  * values for the fbdev info structure.
1721  *
1722  * RETURNS:
1723  * Zero if everything went ok, nonzero otherwise.
1724  */
1725 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1726 {
1727         struct drm_device *dev = fb_helper->dev;
1728         int count = 0;
1729
1730         mutex_lock(&dev->mode_config.mutex);
1731         count = drm_fb_helper_probe_connector_modes(fb_helper,
1732                                                     dev->mode_config.max_width,
1733                                                     dev->mode_config.max_height);
1734         mutex_unlock(&dev->mode_config.mutex);
1735         /*
1736          * we shouldn't end up with no modes here.
1737          */
1738         if (count == 0)
1739                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1740
1741         drm_setup_crtcs(fb_helper);
1742
1743         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1744 }
1745 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1746
1747 /**
1748  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1749  *                               probing all the outputs attached to the fb
1750  * @fb_helper: the drm_fb_helper
1751  *
1752  * Scan the connectors attached to the fb_helper and try to put together a
1753  * setup after *notification of a change in output configuration.
1754  *
1755  * Called at runtime, takes the mode config locks to be able to check/change the
1756  * modeset configuration. Must be run from process context (which usually means
1757  * either the output polling work or a work item launched from the driver's
1758  * hotplug interrupt).
1759  *
1760  * Note that drivers may call this even before calling
1761  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1762  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1763  * not miss any hotplug events.
1764  *
1765  * RETURNS:
1766  * 0 on success and a non-zero error code otherwise.
1767  */
1768 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1769 {
1770         struct drm_device *dev = fb_helper->dev;
1771         u32 max_width, max_height;
1772
1773         mutex_lock(&fb_helper->dev->mode_config.mutex);
1774         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1775                 fb_helper->delayed_hotplug = true;
1776                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1777                 return 0;
1778         }
1779         DRM_DEBUG_KMS("\n");
1780
1781         max_width = fb_helper->fb->width;
1782         max_height = fb_helper->fb->height;
1783
1784         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1785         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1786
1787         drm_modeset_lock_all(dev);
1788         drm_setup_crtcs(fb_helper);
1789         drm_modeset_unlock_all(dev);
1790         drm_fb_helper_set_par(fb_helper->fbdev);
1791
1792         return 0;
1793 }
1794 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1795
1796 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1797  * but the module doesn't depend on any fb console symbols.  At least
1798  * attempt to load fbcon to avoid leaving the system without a usable console.
1799  */
1800 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1801 static int __init drm_fb_helper_modinit(void)
1802 {
1803         const char *name = "fbcon";
1804         struct module *fbcon;
1805
1806         mutex_lock(&module_mutex);
1807         fbcon = find_module(name);
1808         mutex_unlock(&module_mutex);
1809
1810         if (!fbcon)
1811                 request_module_nowait(name);
1812         return 0;
1813 }
1814
1815 module_init(drm_fb_helper_modinit);
1816 #endif