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 #include <drm/drm_atomic.h>
  42 #include <drm/drm_atomic_helper.h>
  43
  44 static bool drm_fbdev_emulation = true;
  45 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
  46 MODULE_PARM_DESC(fbdev_emulation,
  47                  "Enable legacy fbdev emulation [default=true]");
  48
  49 static LIST_HEAD(kernel_fb_helper_list);
  50
  51 /**
  52  * DOC: fbdev helpers
  53  *
  54  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  55  * mode setting driver. They can be used mostly independently from the crtc
  56  * helper functions used by many drivers to implement the kernel mode setting
  57  * interfaces.
  58  *
  59  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  60  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  61  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  62  * default behaviour can override the third step with their own code.
  63  * Teardown is done with drm_fb_helper_fini().
  64  *
  65  * At runtime drivers should restore the fbdev console by calling
  66  * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
  67  * They should also notify the fb helper code from updates to the output
  68  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  69  * integration with the output polling code in drm_crtc_helper.c the modeset
  70  * code provides a ->output_poll_changed callback.
  71  *
  72  * All other functions exported by the fb helper library can be used to
  73  * implement the fbdev driver interface by the driver.
  74  *
  75  * It is possible, though perhaps somewhat tricky, to implement race-free
  76  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  77  * helper must be called first to initialize the minimum required to make
  78  * hotplug detection work. Drivers also need to make sure to properly set up
  79  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  80  * it is safe to enable interrupts and start processing hotplug events. At the
  81  * same time, drivers should initialize all modeset objects such as CRTCs,
  82  * encoders and connectors. To finish up the fbdev helper initialization, the
  83  * drm_fb_helper_init() function is called. To probe for all attached displays
  84  * and set up an initial configuration using the detected hardware, drivers
  85  * should call drm_fb_helper_single_add_all_connectors() followed by
  86  * drm_fb_helper_initial_config().
  87  */
  88
  89 /**
  90  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  91  *                                             emulation helper
  92  * @fb_helper: fbdev initialized with drm_fb_helper_init
  93  *
  94  * This functions adds all the available connectors for use with the given
  95  * fb_helper. This is a separate step to allow drivers to freely assign
  96  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  97  * not adequate to be used for the fbcon.
  98  *
  99  * This function is protected against concurrent connector hotadds/removals
 100  * using drm_fb_helper_add_one_connector() and
 101  * drm_fb_helper_remove_one_connector().
 102  */
 103 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 104 {
 105         struct drm_device *dev = fb_helper->dev;
 106         struct drm_connector *connector;
 107         int i;
 108
 109         if (!drm_fbdev_emulation)
 110                 return 0;
 111
 112         mutex_lock(&dev->mode_config.mutex);
 113         drm_for_each_connector(connector, dev) {
 114                 struct drm_fb_helper_connector *fb_helper_connector;
 115
 116                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 117                 if (!fb_helper_connector)
 118                         goto fail;
 119
 120                 fb_helper_connector->connector = connector;
 121                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 122         }
 123         mutex_unlock(&dev->mode_config.mutex);
 124         return 0;
 125 fail:
 126         for (i = 0; i < fb_helper->connector_count; i++) {
 127                 kfree(fb_helper->connector_info[i]);
 128                 fb_helper->connector_info[i] = NULL;
 129         }
 130         fb_helper->connector_count = 0;
 131         mutex_unlock(&dev->mode_config.mutex);
 132
 133         return -ENOMEM;
 134 }
 135 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 136
 137 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 138 {
 139         struct drm_fb_helper_connector **temp;
 140         struct drm_fb_helper_connector *fb_helper_connector;
 141
 142         if (!drm_fbdev_emulation)
 143                 return 0;
 144
 145         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 146         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 147                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 148                 if (!temp)
 149                         return -ENOMEM;
 150
 151                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 152                 fb_helper->connector_info = temp;
 153         }
 154
 155
 156         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 157         if (!fb_helper_connector)
 158                 return -ENOMEM;
 159
 160         fb_helper_connector->connector = connector;
 161         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 162         return 0;
 163 }
 164 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 165
 166 static void remove_from_modeset(struct drm_mode_set *set,
 167                 struct drm_connector *connector)
 168 {
 169         int i, j;
 170
 171         for (i = 0; i < set->num_connectors; i++) {
 172                 if (set->connectors[i] == connector)
 173                         break;
 174         }
 175
 176         if (i == set->num_connectors)
 177                 return;
 178
 179         for (j = i + 1; j < set->num_connectors; j++) {
 180                 set->connectors[j - 1] = set->connectors[j];
 181         }
 182         set->num_connectors--;
 183
 184         /*
 185          * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 186          */
 187         if (set->num_connectors == 0) {
 188                 set->fb = NULL;
 189                 drm_mode_destroy(connector->dev, set->mode);
 190                 set->mode = NULL;
 191         }
 192 }
 193
 194 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 195                                        struct drm_connector *connector)
 196 {
 197         struct drm_fb_helper_connector *fb_helper_connector;
 198         int i, j;
 199
 200         if (!drm_fbdev_emulation)
 201                 return 0;
 202
 203         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 204
 205         for (i = 0; i < fb_helper->connector_count; i++) {
 206                 if (fb_helper->connector_info[i]->connector == connector)
 207                         break;
 208         }
 209
 210         if (i == fb_helper->connector_count)
 211                 return -EINVAL;
 212         fb_helper_connector = fb_helper->connector_info[i];
 213
 214         for (j = i + 1; j < fb_helper->connector_count; j++) {
 215                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 216         }
 217         fb_helper->connector_count--;
 218         kfree(fb_helper_connector);
 219
 220         /* also cleanup dangling references to the connector: */
 221         for (i = 0; i < fb_helper->crtc_count; i++)
 222                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 223
 224         return 0;
 225 }
 226 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 227
 228 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 229 {
 230         uint16_t *r_base, *g_base, *b_base;
 231         int i;
 232
 233         if (helper->funcs->gamma_get == NULL)
 234                 return;
 235
 236         r_base = crtc->gamma_store;
 237         g_base = r_base + crtc->gamma_size;
 238         b_base = g_base + crtc->gamma_size;
 239
 240         for (i = 0; i < crtc->gamma_size; i++)
 241                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 242 }
 243
 244 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 245 {
 246         uint16_t *r_base, *g_base, *b_base;
 247
 248         if (crtc->funcs->gamma_set == NULL)
 249                 return;
 250
 251         r_base = crtc->gamma_store;
 252         g_base = r_base + crtc->gamma_size;
 253         b_base = g_base + crtc->gamma_size;
 254
 255         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 256 }
 257
 258 /**
 259  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 260  * @info: fbdev registered by the helper
 261  */
 262 int drm_fb_helper_debug_enter(struct fb_info *info)
 263 {
 264         struct drm_fb_helper *helper = info->par;
 265         const struct drm_crtc_helper_funcs *funcs;
 266         int i;
 267
 268         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 269                 for (i = 0; i < helper->crtc_count; i++) {
 270                         struct drm_mode_set *mode_set =
 271                                 &helper->crtc_info[i].mode_set;
 272
 273                         if (!mode_set->crtc->enabled)
 274                                 continue;
 275
 276                         funcs = mode_set->crtc->helper_private;
 277                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 278                         funcs->mode_set_base_atomic(mode_set->crtc,
 279                                                     mode_set->fb,
 280                                                     mode_set->x,
 281                                                     mode_set->y,
 282                                                     ENTER_ATOMIC_MODE_SET);
 283                 }
 284         }
 285
 286         return 0;
 287 }
 288 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 289
 290 /* Find the real fb for a given fb helper CRTC */
 291 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 292 {
 293         struct drm_device *dev = crtc->dev;
 294         struct drm_crtc *c;
 295
 296         drm_for_each_crtc(c, dev) {
 297                 if (crtc->base.id == c->base.id)
 298                         return c->primary->fb;
 299         }
 300
 301         return NULL;
 302 }
 303
 304 /**
 305  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 306  * @info: fbdev registered by the helper
 307  */
 308 int drm_fb_helper_debug_leave(struct fb_info *info)
 309 {
 310         struct drm_fb_helper *helper = info->par;
 311         struct drm_crtc *crtc;
 312         const struct drm_crtc_helper_funcs *funcs;
 313         struct drm_framebuffer *fb;
 314         int i;
 315
 316         for (i = 0; i < helper->crtc_count; i++) {
 317                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 318                 crtc = mode_set->crtc;
 319                 funcs = crtc->helper_private;
 320                 fb = drm_mode_config_fb(crtc);
 321
 322                 if (!crtc->enabled)
 323                         continue;
 324
 325                 if (!fb) {
 326                         DRM_ERROR("no fb to restore??\n");
 327                         continue;
 328                 }
 329
 330                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 331                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 332                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 333         }
 334
 335         return 0;
 336 }
 337 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 338
 339 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
 340 {
 341         struct drm_device *dev = fb_helper->dev;
 342         struct drm_plane *plane;
 343         struct drm_atomic_state *state;
 344         int i, ret;
 345
 346         state = drm_atomic_state_alloc(dev);
 347         if (!state)
 348                 return -ENOMEM;
 349
 350         state->acquire_ctx = dev->mode_config.acquire_ctx;
 351 retry:
 352         drm_for_each_plane(plane, dev) {
 353                 struct drm_plane_state *plane_state;
 354
 355                 plane->old_fb = plane->fb;
 356
 357                 plane_state = drm_atomic_get_plane_state(state, plane);
 358                 if (IS_ERR(plane_state)) {
 359                         ret = PTR_ERR(plane_state);
 360                         goto fail;
 361                 }
 362
 363                 ret = drm_atomic_plane_set_property(plane, plane_state,
 364                                 dev->mode_config.rotation_property,
 365                                 BIT(DRM_ROTATE_0));
 366                 if (ret != 0)
 367                         goto fail;
 368
 369                 /* disable non-primary: */
 370                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 371                         continue;
 372
 373                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
 374                 if (ret != 0)
 375                         goto fail;
 376         }
 377
 378         for(i = 0; i < fb_helper->crtc_count; i++) {
 379                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 380
 381                 ret = __drm_atomic_helper_set_config(mode_set, state);
 382                 if (ret != 0)
 383                         goto fail;
 384         }
 385
 386         ret = drm_atomic_commit(state);
 387
 388 fail:
 389         drm_for_each_plane(plane, dev) {
 390                 if (ret == 0) {
 391                         struct drm_framebuffer *new_fb = plane->state->fb;
 392                         if (new_fb)
 393                                 drm_framebuffer_reference(new_fb);
 394                         plane->fb = new_fb;
 395                         plane->crtc = plane->state->crtc;
 396
 397                         if (plane->old_fb)
 398                                 drm_framebuffer_unreference(plane->old_fb);
 399                 }
 400                 plane->old_fb = NULL;
 401         }
 402
 403         if (ret == -EDEADLK)
 404                 goto backoff;
 405
 406         if (ret != 0)
 407                 drm_atomic_state_free(state);
 408
 409         return ret;
 410
 411 backoff:
 412         drm_atomic_state_clear(state);
 413         drm_atomic_legacy_backoff(state);
 414
 415         goto retry;
 416 }
 417
 418 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 419 {
 420         struct drm_device *dev = fb_helper->dev;
 421         struct drm_plane *plane;
 422         int i;
 423
 424         drm_warn_on_modeset_not_all_locked(dev);
 425
 426         if (fb_helper->atomic)
 427                 return restore_fbdev_mode_atomic(fb_helper);
 428
 429         drm_for_each_plane(plane, dev) {
 430                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 431                         drm_plane_force_disable(plane);
 432
 433                 if (dev->mode_config.rotation_property) {
 434                         drm_mode_plane_set_obj_prop(plane,
 435                                                     dev->mode_config.rotation_property,
 436                                                     BIT(DRM_ROTATE_0));
 437                 }
 438         }
 439
 440         for (i = 0; i < fb_helper->crtc_count; i++) {
 441                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 442                 struct drm_crtc *crtc = mode_set->crtc;
 443                 int ret;
 444
 445                 if (crtc->funcs->cursor_set) {
 446                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 447                         if (ret)
 448                                 return ret;
 449                 }
 450
 451                 ret = drm_mode_set_config_internal(mode_set);
 452                 if (ret)
 453                         return ret;
 454         }
 455
 456         return 0;
 457 }
 458
 459 /**
 460  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 461  * @fb_helper: fbcon to restore
 462  *
 463  * This should be called from driver's drm ->lastclose callback
 464  * when implementing an fbcon on top of kms using this helper. This ensures that
 465  * the user isn't greeted with a black screen when e.g. X dies.
 466  *
 467  * RETURNS:
 468  * Zero if everything went ok, negative error code otherwise.
 469  */
 470 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 471 {
 472         struct drm_device *dev = fb_helper->dev;
 473         bool do_delayed;
 474         int ret;
 475
 476         if (!drm_fbdev_emulation)
 477                 return -ENODEV;
 478
 479         drm_modeset_lock_all(dev);
 480         ret = restore_fbdev_mode(fb_helper);
 481
 482         do_delayed = fb_helper->delayed_hotplug;
 483         if (do_delayed)
 484                 fb_helper->delayed_hotplug = false;
 485         drm_modeset_unlock_all(dev);
 486
 487         if (do_delayed)
 488                 drm_fb_helper_hotplug_event(fb_helper);
 489         return ret;
 490 }
 491 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 492
 493 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 494 {
 495         struct drm_device *dev = fb_helper->dev;
 496         struct drm_crtc *crtc;
 497         int bound = 0, crtcs_bound = 0;
 498
 499         /* Sometimes user space wants everything disabled, so don't steal the
 500          * display if there's a master. */
 501         if (dev->primary->master)
 502                 return false;
 503
 504         drm_for_each_crtc(crtc, dev) {
 505                 if (crtc->primary->fb)
 506                         crtcs_bound++;
 507                 if (crtc->primary->fb == fb_helper->fb)
 508                         bound++;
 509         }
 510
 511         if (bound < crtcs_bound)
 512                 return false;
 513
 514         return true;
 515 }
 516
 517 #ifdef CONFIG_MAGIC_SYSRQ
 518 /*
 519  * restore fbcon display for all kms driver's using this helper, used for sysrq
 520  * and panic handling.
 521  */
 522 static bool drm_fb_helper_force_kernel_mode(void)
 523 {
 524         bool ret, error = false;
 525         struct drm_fb_helper *helper;
 526
 527         if (list_empty(&kernel_fb_helper_list))
 528                 return false;
 529
 530         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 531                 struct drm_device *dev = helper->dev;
 532
 533                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 534                         continue;
 535
 536                 drm_modeset_lock_all(dev);
 537                 ret = restore_fbdev_mode(helper);
 538                 if (ret)
 539                         error = true;
 540                 drm_modeset_unlock_all(dev);
 541         }
 542         return error;
 543 }
 544
 545 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 546 {
 547         bool ret;
 548         ret = drm_fb_helper_force_kernel_mode();
 549         if (ret == true)
 550                 DRM_ERROR("Failed to restore crtc configuration\n");
 551 }
 552 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 553
 554 static void drm_fb_helper_sysrq(int dummy1)
 555 {
 556         schedule_work(&drm_fb_helper_restore_work);
 557 }
 558
 559 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 560         .handler = drm_fb_helper_sysrq,
 561         .help_msg = "force-fb(V)",
 562         .action_msg = "Restore framebuffer console",
 563 };
 564 #else
 565 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 566 #endif
 567
 568 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 569 {
 570         struct drm_fb_helper *fb_helper = info->par;
 571         struct drm_device *dev = fb_helper->dev;
 572         struct drm_crtc *crtc;
 573         struct drm_connector *connector;
 574         int i, j;
 575
 576         /*
 577          * For each CRTC in this fb, turn the connectors on/off.
 578          */
 579         drm_modeset_lock_all(dev);
 580         if (!drm_fb_helper_is_bound(fb_helper)) {
 581                 drm_modeset_unlock_all(dev);
 582                 return;
 583         }
 584
 585         for (i = 0; i < fb_helper->crtc_count; i++) {
 586                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 587
 588                 if (!crtc->enabled)
 589                         continue;
 590
 591                 /* Walk the connectors & encoders on this fb turning them on/off */
 592                 for (j = 0; j < fb_helper->connector_count; j++) {
 593                         connector = fb_helper->connector_info[j]->connector;
 594                         connector->funcs->dpms(connector, dpms_mode);
 595                         drm_object_property_set_value(&connector->base,
 596                                 dev->mode_config.dpms_property, dpms_mode);
 597                 }
 598         }
 599         drm_modeset_unlock_all(dev);
 600 }
 601
 602 /**
 603  * drm_fb_helper_blank - implementation for ->fb_blank
 604  * @blank: desired blanking state
 605  * @info: fbdev registered by the helper
 606  */
 607 int drm_fb_helper_blank(int blank, struct fb_info *info)
 608 {
 609         if (oops_in_progress)
 610                 return -EBUSY;
 611
 612         switch (blank) {
 613         /* Display: On; HSync: On, VSync: On */
 614         case FB_BLANK_UNBLANK:
 615                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 616                 break;
 617         /* Display: Off; HSync: On, VSync: On */
 618         case FB_BLANK_NORMAL:
 619                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 620                 break;
 621         /* Display: Off; HSync: Off, VSync: On */
 622         case FB_BLANK_HSYNC_SUSPEND:
 623                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 624                 break;
 625         /* Display: Off; HSync: On, VSync: Off */
 626         case FB_BLANK_VSYNC_SUSPEND:
 627                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 628                 break;
 629         /* Display: Off; HSync: Off, VSync: Off */
 630         case FB_BLANK_POWERDOWN:
 631                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 632                 break;
 633         }
 634         return 0;
 635 }
 636 EXPORT_SYMBOL(drm_fb_helper_blank);
 637
 638 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 639 {
 640         int i;
 641
 642         for (i = 0; i < helper->connector_count; i++)
 643                 kfree(helper->connector_info[i]);
 644         kfree(helper->connector_info);
 645         for (i = 0; i < helper->crtc_count; i++) {
 646                 kfree(helper->crtc_info[i].mode_set.connectors);
 647                 if (helper->crtc_info[i].mode_set.mode)
 648                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 649         }
 650         kfree(helper->crtc_info);
 651 }
 652
 653 /**
 654  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 655  * @dev: DRM device
 656  * @helper: driver-allocated fbdev helper structure to set up
 657  * @funcs: pointer to structure of functions associate with this helper
 658  *
 659  * Sets up the bare minimum to make the framebuffer helper usable. This is
 660  * useful to implement race-free initialization of the polling helpers.
 661  */
 662 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 663                            const struct drm_fb_helper_funcs *funcs)
 664 {
 665         INIT_LIST_HEAD(&helper->kernel_fb_list);
 666         helper->funcs = funcs;
 667         helper->dev = dev;
 668 }
 669 EXPORT_SYMBOL(drm_fb_helper_prepare);
 670
 671 /**
 672  * drm_fb_helper_init - initialize a drm_fb_helper structure
 673  * @dev: drm device
 674  * @fb_helper: driver-allocated fbdev helper structure to initialize
 675  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 676  * @max_conn_count: max connector count
 677  *
 678  * This allocates the structures for the fbdev helper with the given limits.
 679  * Note that this won't yet touch the hardware (through the driver interfaces)
 680  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 681  * to allow driver writes more control over the exact init sequence.
 682  *
 683  * Drivers must call drm_fb_helper_prepare() before calling this function.
 684  *
 685  * RETURNS:
 686  * Zero if everything went ok, nonzero otherwise.
 687  */
 688 int drm_fb_helper_init(struct drm_device *dev,
 689                        struct drm_fb_helper *fb_helper,
 690                        int crtc_count, int max_conn_count)
 691 {
 692         struct drm_crtc *crtc;
 693         int i;
 694
 695         if (!drm_fbdev_emulation)
 696                 return 0;
 697
 698         if (!max_conn_count)
 699                 return -EINVAL;
 700
 701         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 702         if (!fb_helper->crtc_info)
 703                 return -ENOMEM;
 704
 705         fb_helper->crtc_count = crtc_count;
 706         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 707         if (!fb_helper->connector_info) {
 708                 kfree(fb_helper->crtc_info);
 709                 return -ENOMEM;
 710         }
 711         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 712         fb_helper->connector_count = 0;
 713
 714         for (i = 0; i < crtc_count; i++) {
 715                 fb_helper->crtc_info[i].mode_set.connectors =
 716                         kcalloc(max_conn_count,
 717                                 sizeof(struct drm_connector *),
 718                                 GFP_KERNEL);
 719
 720                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 721                         goto out_free;
 722                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 723         }
 724
 725         i = 0;
 726         drm_for_each_crtc(crtc, dev) {
 727                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 728                 i++;
 729         }
 730
 731         fb_helper->atomic = !!drm_core_check_feature(dev, DRIVER_ATOMIC);
 732
 733         return 0;
 734 out_free:
 735         drm_fb_helper_crtc_free(fb_helper);
 736         return -ENOMEM;
 737 }
 738 EXPORT_SYMBOL(drm_fb_helper_init);
 739
 740 /**
 741  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 742  * @fb_helper: driver-allocated fbdev helper
 743  *
 744  * A helper to alloc fb_info and the members cmap and apertures. Called
 745  * by the driver within the fb_probe fb_helper callback function.
 746  *
 747  * RETURNS:
 748  * fb_info pointer if things went okay, pointer containing error code
 749  * otherwise
 750  */
 751 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 752 {
 753         struct device *dev = fb_helper->dev->dev;
 754         struct fb_info *info;
 755         int ret;
 756
 757         info = framebuffer_alloc(0, dev);
 758         if (!info)
 759                 return ERR_PTR(-ENOMEM);
 760
 761         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 762         if (ret)
 763                 goto err_release;
 764
 765         info->apertures = alloc_apertures(1);
 766         if (!info->apertures) {
 767                 ret = -ENOMEM;
 768                 goto err_free_cmap;
 769         }
 770
 771         fb_helper->fbdev = info;
 772
 773         return info;
 774
 775 err_free_cmap:
 776         fb_dealloc_cmap(&info->cmap);
 777 err_release:
 778         framebuffer_release(info);
 779         return ERR_PTR(ret);
 780 }
 781 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 782
 783 /**
 784  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 785  * @fb_helper: driver-allocated fbdev helper
 786  *
 787  * A wrapper around unregister_framebuffer, to release the fb_info
 788  * framebuffer device
 789  */
 790 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 791 {
 792         if (fb_helper && fb_helper->fbdev)
 793                 unregister_framebuffer(fb_helper->fbdev);
 794 }
 795 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 796
 797 /**
 798  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 799  * @fb_helper: driver-allocated fbdev helper
 800  *
 801  * A helper to free memory taken by fb_info and the members cmap and
 802  * apertures
 803  */
 804 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 805 {
 806         if (fb_helper) {
 807                 struct fb_info *info = fb_helper->fbdev;
 808
 809                 if (info) {
 810                         if (info->cmap.len)
 811                                 fb_dealloc_cmap(&info->cmap);
 812                         framebuffer_release(info);
 813                 }
 814
 815                 fb_helper->fbdev = NULL;
 816         }
 817 }
 818 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 819
 820 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 821 {
 822         if (!drm_fbdev_emulation)
 823                 return;
 824
 825         if (!list_empty(&fb_helper->kernel_fb_list)) {
 826                 list_del(&fb_helper->kernel_fb_list);
 827                 if (list_empty(&kernel_fb_helper_list)) {
 828                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 829                 }
 830         }
 831
 832         drm_fb_helper_crtc_free(fb_helper);
 833
 834 }
 835 EXPORT_SYMBOL(drm_fb_helper_fini);
 836
 837 /**
 838  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 839  * @fb_helper: driver-allocated fbdev helper
 840  *
 841  * A wrapper around unlink_framebuffer implemented by fbdev core
 842  */
 843 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 844 {
 845         if (fb_helper && fb_helper->fbdev)
 846                 unlink_framebuffer(fb_helper->fbdev);
 847 }
 848 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 849
 850 /**
 851  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 852  * @info: fb_info struct pointer
 853  * @buf: userspace buffer to read from framebuffer memory
 854  * @count: number of bytes to read from framebuffer memory
 855  * @ppos: read offset within framebuffer memory
 856  *
 857  * A wrapper around fb_sys_read implemented by fbdev core
 858  */
 859 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 860                                size_t count, loff_t *ppos)
 861 {
 862         return fb_sys_read(info, buf, count, ppos);
 863 }
 864 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 865
 866 /**
 867  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 868  * @info: fb_info struct pointer
 869  * @buf: userspace buffer to write to framebuffer memory
 870  * @count: number of bytes to write to framebuffer memory
 871  * @ppos: write offset within framebuffer memory
 872  *
 873  * A wrapper around fb_sys_write implemented by fbdev core
 874  */
 875 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 876                                 size_t count, loff_t *ppos)
 877 {
 878         return fb_sys_write(info, buf, count, ppos);
 879 }
 880 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 881
 882 /**
 883  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 884  * @info: fbdev registered by the helper
 885  * @rect: info about rectangle to fill
 886  *
 887  * A wrapper around sys_fillrect implemented by fbdev core
 888  */
 889 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 890                                 const struct fb_fillrect *rect)
 891 {
 892         sys_fillrect(info, rect);
 893 }
 894 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 895
 896 /**
 897  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 898  * @info: fbdev registered by the helper
 899  * @area: info about area to copy
 900  *
 901  * A wrapper around sys_copyarea implemented by fbdev core
 902  */
 903 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 904                                 const struct fb_copyarea *area)
 905 {
 906         sys_copyarea(info, area);
 907 }
 908 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 909
 910 /**
 911  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 912  * @info: fbdev registered by the helper
 913  * @image: info about image to blit
 914  *
 915  * A wrapper around sys_imageblit implemented by fbdev core
 916  */
 917 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 918                                  const struct fb_image *image)
 919 {
 920         sys_imageblit(info, image);
 921 }
 922 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 923
 924 /**
 925  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 926  * @info: fbdev registered by the helper
 927  * @rect: info about rectangle to fill
 928  *
 929  * A wrapper around cfb_imageblit implemented by fbdev core
 930  */
 931 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 932                                 const struct fb_fillrect *rect)
 933 {
 934         cfb_fillrect(info, rect);
 935 }
 936 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 937
 938 /**
 939  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 940  * @info: fbdev registered by the helper
 941  * @area: info about area to copy
 942  *
 943  * A wrapper around cfb_copyarea implemented by fbdev core
 944  */
 945 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 946                                 const struct fb_copyarea *area)
 947 {
 948         cfb_copyarea(info, area);
 949 }
 950 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
 951
 952 /**
 953  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
 954  * @info: fbdev registered by the helper
 955  * @image: info about image to blit
 956  *
 957  * A wrapper around cfb_imageblit implemented by fbdev core
 958  */
 959 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 960                                  const struct fb_image *image)
 961 {
 962         cfb_imageblit(info, image);
 963 }
 964 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 965
 966 /**
 967  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
 968  * @fb_helper: driver-allocated fbdev helper
 969  * @state: desired state, zero to resume, non-zero to suspend
 970  *
 971  * A wrapper around fb_set_suspend implemented by fbdev core
 972  */
 973 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
 974 {
 975         if (fb_helper && fb_helper->fbdev)
 976                 fb_set_suspend(fb_helper->fbdev, state);
 977 }
 978 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
 979
 980 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 981                      u16 blue, u16 regno, struct fb_info *info)
 982 {
 983         struct drm_fb_helper *fb_helper = info->par;
 984         struct drm_framebuffer *fb = fb_helper->fb;
 985         int pindex;
 986
 987         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 988                 u32 *palette;
 989                 u32 value;
 990                 /* place color in psuedopalette */
 991                 if (regno > 16)
 992                         return -EINVAL;
 993                 palette = (u32 *)info->pseudo_palette;
 994                 red >>= (16 - info->var.red.length);
 995                 green >>= (16 - info->var.green.length);
 996                 blue >>= (16 - info->var.blue.length);
 997                 value = (red << info->var.red.offset) |
 998                         (green << info->var.green.offset) |
 999                         (blue << info->var.blue.offset);
1000                 if (info->var.transp.length > 0) {
1001                         u32 mask = (1 << info->var.transp.length) - 1;
1002                         mask <<= info->var.transp.offset;
1003                         value |= mask;
1004                 }
1005                 palette[regno] = value;
1006                 return 0;
1007         }
1008
1009         /*
1010          * The driver really shouldn't advertise pseudo/directcolor
1011          * visuals if it can't deal with the palette.
1012          */
1013         if (WARN_ON(!fb_helper->funcs->gamma_set ||
1014                     !fb_helper->funcs->gamma_get))
1015                 return -EINVAL;
1016
1017         pindex = regno;
1018
1019         if (fb->bits_per_pixel == 16) {
1020                 pindex = regno << 3;
1021
1022                 if (fb->depth == 16 && regno > 63)
1023                         return -EINVAL;
1024                 if (fb->depth == 15 && regno > 31)
1025                         return -EINVAL;
1026
1027                 if (fb->depth == 16) {
1028                         u16 r, g, b;
1029                         int i;
1030                         if (regno < 32) {
1031                                 for (i = 0; i < 8; i++)
1032                                         fb_helper->funcs->gamma_set(crtc, red,
1033                                                 green, blue, pindex + i);
1034                         }
1035
1036                         fb_helper->funcs->gamma_get(crtc, &r,
1037                                                     &g, &b,
1038                                                     pindex >> 1);
1039
1040                         for (i = 0; i < 4; i++)
1041                                 fb_helper->funcs->gamma_set(crtc, r,
1042                                                             green, b,
1043                                                             (pindex >> 1) + i);
1044                 }
1045         }
1046
1047         if (fb->depth != 16)
1048                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
1049         return 0;
1050 }
1051
1052 /**
1053  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1054  * @cmap: cmap to set
1055  * @info: fbdev registered by the helper
1056  */
1057 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1058 {
1059         struct drm_fb_helper *fb_helper = info->par;
1060         struct drm_device *dev = fb_helper->dev;
1061         const struct drm_crtc_helper_funcs *crtc_funcs;
1062         u16 *red, *green, *blue, *transp;
1063         struct drm_crtc *crtc;
1064         int i, j, rc = 0;
1065         int start;
1066
1067         if (oops_in_progress)
1068                 return -EBUSY;
1069
1070         drm_modeset_lock_all(dev);
1071         if (!drm_fb_helper_is_bound(fb_helper)) {
1072                 drm_modeset_unlock_all(dev);
1073                 return -EBUSY;
1074         }
1075
1076         for (i = 0; i < fb_helper->crtc_count; i++) {
1077                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1078                 crtc_funcs = crtc->helper_private;
1079
1080                 red = cmap->red;
1081                 green = cmap->green;
1082                 blue = cmap->blue;
1083                 transp = cmap->transp;
1084                 start = cmap->start;
1085
1086                 for (j = 0; j < cmap->len; j++) {
1087                         u16 hred, hgreen, hblue, htransp = 0xffff;
1088
1089                         hred = *red++;
1090                         hgreen = *green++;
1091                         hblue = *blue++;
1092
1093                         if (transp)
1094                                 htransp = *transp++;
1095
1096                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1097                         if (rc)
1098                                 goto out;
1099                 }
1100                 if (crtc_funcs->load_lut)
1101                         crtc_funcs->load_lut(crtc);
1102         }
1103  out:
1104         drm_modeset_unlock_all(dev);
1105         return rc;
1106 }
1107 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1108
1109 /**
1110  * drm_fb_helper_check_var - implementation for ->fb_check_var
1111  * @var: screeninfo to check
1112  * @info: fbdev registered by the helper
1113  */
1114 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1115                             struct fb_info *info)
1116 {
1117         struct drm_fb_helper *fb_helper = info->par;
1118         struct drm_framebuffer *fb = fb_helper->fb;
1119         int depth;
1120
1121         if (var->pixclock != 0 || in_dbg_master())
1122                 return -EINVAL;
1123
1124         /* Need to resize the fb object !!! */
1125         if (var->bits_per_pixel > fb->bits_per_pixel ||
1126             var->xres > fb->width || var->yres > fb->height ||
1127             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1128                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1129                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1130                           var->xres, var->yres, var->bits_per_pixel,
1131                           var->xres_virtual, var->yres_virtual,
1132                           fb->width, fb->height, fb->bits_per_pixel);
1133                 return -EINVAL;
1134         }
1135
1136         switch (var->bits_per_pixel) {
1137         case 16:
1138                 depth = (var->green.length == 6) ? 16 : 15;
1139                 break;
1140         case 32:
1141                 depth = (var->transp.length > 0) ? 32 : 24;
1142                 break;
1143         default:
1144                 depth = var->bits_per_pixel;
1145                 break;
1146         }
1147
1148         switch (depth) {
1149         case 8:
1150                 var->red.offset = 0;
1151                 var->green.offset = 0;
1152                 var->blue.offset = 0;
1153                 var->red.length = 8;
1154                 var->green.length = 8;
1155                 var->blue.length = 8;
1156                 var->transp.length = 0;
1157                 var->transp.offset = 0;
1158                 break;
1159         case 15:
1160                 var->red.offset = 10;
1161                 var->green.offset = 5;
1162                 var->blue.offset = 0;
1163                 var->red.length = 5;
1164                 var->green.length = 5;
1165                 var->blue.length = 5;
1166                 var->transp.length = 1;
1167                 var->transp.offset = 15;
1168                 break;
1169         case 16:
1170                 var->red.offset = 11;
1171                 var->green.offset = 5;
1172                 var->blue.offset = 0;
1173                 var->red.length = 5;
1174                 var->green.length = 6;
1175                 var->blue.length = 5;
1176                 var->transp.length = 0;
1177                 var->transp.offset = 0;
1178                 break;
1179         case 24:
1180                 var->red.offset = 16;
1181                 var->green.offset = 8;
1182                 var->blue.offset = 0;
1183                 var->red.length = 8;
1184                 var->green.length = 8;
1185                 var->blue.length = 8;
1186                 var->transp.length = 0;
1187                 var->transp.offset = 0;
1188                 break;
1189         case 32:
1190                 var->red.offset = 16;
1191                 var->green.offset = 8;
1192                 var->blue.offset = 0;
1193                 var->red.length = 8;
1194                 var->green.length = 8;
1195                 var->blue.length = 8;
1196                 var->transp.length = 8;
1197                 var->transp.offset = 24;
1198                 break;
1199         default:
1200                 return -EINVAL;
1201         }
1202         return 0;
1203 }
1204 EXPORT_SYMBOL(drm_fb_helper_check_var);
1205
1206 /**
1207  * drm_fb_helper_set_par - implementation for ->fb_set_par
1208  * @info: fbdev registered by the helper
1209  *
1210  * This will let fbcon do the mode init and is called at initialization time by
1211  * the fbdev core when registering the driver, and later on through the hotplug
1212  * callback.
1213  */
1214 int drm_fb_helper_set_par(struct fb_info *info)
1215 {
1216         struct drm_fb_helper *fb_helper = info->par;
1217         struct fb_var_screeninfo *var = &info->var;
1218
1219         if (oops_in_progress)
1220                 return -EBUSY;
1221
1222         if (var->pixclock != 0) {
1223                 DRM_ERROR("PIXEL CLOCK SET\n");
1224                 return -EINVAL;
1225         }
1226
1227         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1228
1229         return 0;
1230 }
1231 EXPORT_SYMBOL(drm_fb_helper_set_par);
1232
1233 static int pan_display_atomic(struct fb_var_screeninfo *var,
1234                 struct fb_info *info)
1235 {
1236         struct drm_fb_helper *fb_helper = info->par;
1237         struct drm_device *dev = fb_helper->dev;
1238         struct drm_atomic_state *state;
1239         int i, ret;
1240
1241         state = drm_atomic_state_alloc(dev);
1242         if (!state)
1243                 return -ENOMEM;
1244
1245         state->acquire_ctx = dev->mode_config.acquire_ctx;
1246 retry:
1247         for(i = 0; i < fb_helper->crtc_count; i++) {
1248                 struct drm_mode_set *mode_set;
1249
1250                 mode_set = &fb_helper->crtc_info[i].mode_set;
1251
1252                 mode_set->x = var->xoffset;
1253                 mode_set->y = var->yoffset;
1254
1255                 ret = __drm_atomic_helper_set_config(mode_set, state);
1256                 if (ret != 0)
1257                         goto fail;
1258         }
1259
1260         ret = drm_atomic_commit(state);
1261         if (ret != 0)
1262                 goto fail;
1263
1264         info->var.xoffset = var->xoffset;
1265         info->var.yoffset = var->yoffset;
1266
1267         return 0;
1268
1269 fail:
1270         if (ret == -EDEADLK)
1271                 goto backoff;
1272
1273         drm_atomic_state_free(state);
1274
1275         return ret;
1276
1277 backoff:
1278         drm_atomic_state_clear(state);
1279         drm_atomic_legacy_backoff(state);
1280
1281         goto retry;
1282 }
1283
1284 /**
1285  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1286  * @var: updated screen information
1287  * @info: fbdev registered by the helper
1288  */
1289 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1290                               struct fb_info *info)
1291 {
1292         struct drm_fb_helper *fb_helper = info->par;
1293         struct drm_device *dev = fb_helper->dev;
1294         struct drm_mode_set *modeset;
1295         int ret = 0;
1296         int i;
1297
1298         if (oops_in_progress)
1299                 return -EBUSY;
1300
1301         drm_modeset_lock_all(dev);
1302         if (!drm_fb_helper_is_bound(fb_helper)) {
1303                 drm_modeset_unlock_all(dev);
1304                 return -EBUSY;
1305         }
1306
1307         if (fb_helper->atomic) {
1308                 ret = pan_display_atomic(var, info);
1309                 goto unlock;
1310         }
1311
1312         for (i = 0; i < fb_helper->crtc_count; i++) {
1313                 modeset = &fb_helper->crtc_info[i].mode_set;
1314
1315                 modeset->x = var->xoffset;
1316                 modeset->y = var->yoffset;
1317
1318                 if (modeset->num_connectors) {
1319                         ret = drm_mode_set_config_internal(modeset);
1320                         if (!ret) {
1321                                 info->var.xoffset = var->xoffset;
1322                                 info->var.yoffset = var->yoffset;
1323                         }
1324                 }
1325         }
1326 unlock:
1327         drm_modeset_unlock_all(dev);
1328         return ret;
1329 }
1330 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1331
1332 /*
1333  * Allocates the backing storage and sets up the fbdev info structure through
1334  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1335  * notifier.
1336  */
1337 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1338                                          int preferred_bpp)
1339 {
1340         int ret = 0;
1341         int crtc_count = 0;
1342         int i;
1343         struct fb_info *info;
1344         struct drm_fb_helper_surface_size sizes;
1345         int gamma_size = 0;
1346
1347         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1348         sizes.surface_depth = 24;
1349         sizes.surface_bpp = 32;
1350         sizes.fb_width = (unsigned)-1;
1351         sizes.fb_height = (unsigned)-1;
1352
1353         /* if driver picks 8 or 16 by default use that
1354            for both depth/bpp */
1355         if (preferred_bpp != sizes.surface_bpp)
1356                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1357
1358         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1359         for (i = 0; i < fb_helper->connector_count; i++) {
1360                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1361                 struct drm_cmdline_mode *cmdline_mode;
1362
1363                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1364
1365                 if (cmdline_mode->bpp_specified) {
1366                         switch (cmdline_mode->bpp) {
1367                         case 8:
1368                                 sizes.surface_depth = sizes.surface_bpp = 8;
1369                                 break;
1370                         case 15:
1371                                 sizes.surface_depth = 15;
1372                                 sizes.surface_bpp = 16;
1373                                 break;
1374                         case 16:
1375                                 sizes.surface_depth = sizes.surface_bpp = 16;
1376                                 break;
1377                         case 24:
1378                                 sizes.surface_depth = sizes.surface_bpp = 24;
1379                                 break;
1380                         case 32:
1381                                 sizes.surface_depth = 24;
1382                                 sizes.surface_bpp = 32;
1383                                 break;
1384                         }
1385                         break;
1386                 }
1387         }
1388
1389         crtc_count = 0;
1390         for (i = 0; i < fb_helper->crtc_count; i++) {
1391                 struct drm_display_mode *desired_mode;
1392                 struct drm_mode_set *mode_set;
1393                 int x, y, j;
1394                 /* in case of tile group, are we the last tile vert or horiz?
1395                  * If no tile group you are always the last one both vertically
1396                  * and horizontally
1397                  */
1398                 bool lastv = true, lasth = true;
1399
1400                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1401                 mode_set = &fb_helper->crtc_info[i].mode_set;
1402
1403                 if (!desired_mode)
1404                         continue;
1405
1406                 crtc_count++;
1407
1408                 x = fb_helper->crtc_info[i].x;
1409                 y = fb_helper->crtc_info[i].y;
1410
1411                 if (gamma_size == 0)
1412                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1413
1414                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1415                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1416
1417                 for (j = 0; j < mode_set->num_connectors; j++) {
1418                         struct drm_connector *connector = mode_set->connectors[j];
1419                         if (connector->has_tile) {
1420                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1421                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1422                                 /* cloning to multiple tiles is just crazy-talk, so: */
1423                                 break;
1424                         }
1425                 }
1426
1427                 if (lasth)
1428                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1429                 if (lastv)
1430                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1431         }
1432
1433         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1434                 /* hmm everyone went away - assume VGA cable just fell out
1435                    and will come back later. */
1436                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1437                 sizes.fb_width = sizes.surface_width = 1024;
1438                 sizes.fb_height = sizes.surface_height = 768;
1439         }
1440
1441         /* push down into drivers */
1442         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1443         if (ret < 0)
1444                 return ret;
1445
1446         info = fb_helper->fbdev;
1447
1448         /*
1449          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1450          * events, but at init time drm_setup_crtcs needs to be called before
1451          * the fb is allocated (since we need to figure out the desired size of
1452          * the fb before we can allocate it ...). Hence we need to fix things up
1453          * here again.
1454          */
1455         for (i = 0; i < fb_helper->crtc_count; i++)
1456                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1457                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1458
1459
1460         info->var.pixclock = 0;
1461         if (register_framebuffer(info) < 0)
1462                 return -EINVAL;
1463
1464         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1465                         info->node, info->fix.id);
1466
1467         if (list_empty(&kernel_fb_helper_list)) {
1468                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1469         }
1470
1471         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1472
1473         return 0;
1474 }
1475
1476 /**
1477  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1478  * @info: fbdev registered by the helper
1479  * @pitch: desired pitch
1480  * @depth: desired depth
1481  *
1482  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1483  * fbdev emulations. Drivers which support acceleration methods which impose
1484  * additional constraints need to set up their own limits.
1485  *
1486  * Drivers should call this (or their equivalent setup code) from their
1487  * ->fb_probe callback.
1488  */
1489 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1490                             uint32_t depth)
1491 {
1492         info->fix.type = FB_TYPE_PACKED_PIXELS;
1493         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1494                 FB_VISUAL_TRUECOLOR;
1495         info->fix.mmio_start = 0;
1496         info->fix.mmio_len = 0;
1497         info->fix.type_aux = 0;
1498         info->fix.xpanstep = 1; /* doing it in hw */
1499         info->fix.ypanstep = 1; /* doing it in hw */
1500         info->fix.ywrapstep = 0;
1501         info->fix.accel = FB_ACCEL_NONE;
1502
1503         info->fix.line_length = pitch;
1504         return;
1505 }
1506 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1507
1508 /**
1509  * drm_fb_helper_fill_var - initalizes variable fbdev information
1510  * @info: fbdev instance to set up
1511  * @fb_helper: fb helper instance to use as template
1512  * @fb_width: desired fb width
1513  * @fb_height: desired fb height
1514  *
1515  * Sets up the variable fbdev metainformation from the given fb helper instance
1516  * and the drm framebuffer allocated in fb_helper->fb.
1517  *
1518  * Drivers should call this (or their equivalent setup code) from their
1519  * ->fb_probe callback after having allocated the fbdev backing
1520  * storage framebuffer.
1521  */
1522 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1523                             uint32_t fb_width, uint32_t fb_height)
1524 {
1525         struct drm_framebuffer *fb = fb_helper->fb;
1526         info->pseudo_palette = fb_helper->pseudo_palette;
1527         info->var.xres_virtual = fb->width;
1528         info->var.yres_virtual = fb->height;
1529         info->var.bits_per_pixel = fb->bits_per_pixel;
1530         info->var.accel_flags = FB_ACCELF_TEXT;
1531         info->var.xoffset = 0;
1532         info->var.yoffset = 0;
1533         info->var.activate = FB_ACTIVATE_NOW;
1534         info->var.height = -1;
1535         info->var.width = -1;
1536
1537         switch (fb->depth) {
1538         case 8:
1539                 info->var.red.offset = 0;
1540                 info->var.green.offset = 0;
1541                 info->var.blue.offset = 0;
1542                 info->var.red.length = 8; /* 8bit DAC */
1543                 info->var.green.length = 8;
1544                 info->var.blue.length = 8;
1545                 info->var.transp.offset = 0;
1546                 info->var.transp.length = 0;
1547                 break;
1548         case 15:
1549                 info->var.red.offset = 10;
1550                 info->var.green.offset = 5;
1551                 info->var.blue.offset = 0;
1552                 info->var.red.length = 5;
1553                 info->var.green.length = 5;
1554                 info->var.blue.length = 5;
1555                 info->var.transp.offset = 15;
1556                 info->var.transp.length = 1;
1557                 break;
1558         case 16:
1559                 info->var.red.offset = 11;
1560                 info->var.green.offset = 5;
1561                 info->var.blue.offset = 0;
1562                 info->var.red.length = 5;
1563                 info->var.green.length = 6;
1564                 info->var.blue.length = 5;
1565                 info->var.transp.offset = 0;
1566                 break;
1567         case 24:
1568                 info->var.red.offset = 16;
1569                 info->var.green.offset = 8;
1570                 info->var.blue.offset = 0;
1571                 info->var.red.length = 8;
1572                 info->var.green.length = 8;
1573                 info->var.blue.length = 8;
1574                 info->var.transp.offset = 0;
1575                 info->var.transp.length = 0;
1576                 break;
1577         case 32:
1578                 info->var.red.offset = 16;
1579                 info->var.green.offset = 8;
1580                 info->var.blue.offset = 0;
1581                 info->var.red.length = 8;
1582                 info->var.green.length = 8;
1583                 info->var.blue.length = 8;
1584                 info->var.transp.offset = 24;
1585                 info->var.transp.length = 8;
1586                 break;
1587         default:
1588                 break;
1589         }
1590
1591         info->var.xres = fb_width;
1592         info->var.yres = fb_height;
1593 }
1594 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1595
1596 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1597                                                uint32_t maxX,
1598                                                uint32_t maxY)
1599 {
1600         struct drm_connector *connector;
1601         int count = 0;
1602         int i;
1603
1604         for (i = 0; i < fb_helper->connector_count; i++) {
1605                 connector = fb_helper->connector_info[i]->connector;
1606                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1607         }
1608
1609         return count;
1610 }
1611
1612 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1613 {
1614         struct drm_display_mode *mode;
1615
1616         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1617                 if (mode->hdisplay > width ||
1618                     mode->vdisplay > height)
1619                         continue;
1620                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1621                         return mode;
1622         }
1623         return NULL;
1624 }
1625 EXPORT_SYMBOL(drm_has_preferred_mode);
1626
1627 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1628 {
1629         return fb_connector->connector->cmdline_mode.specified;
1630 }
1631
1632 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1633                                                       int width, int height)
1634 {
1635         struct drm_cmdline_mode *cmdline_mode;
1636         struct drm_display_mode *mode;
1637         bool prefer_non_interlace;
1638
1639         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1640         if (cmdline_mode->specified == false)
1641                 return NULL;
1642
1643         /* attempt to find a matching mode in the list of modes
1644          *  we have gotten so far, if not add a CVT mode that conforms
1645          */
1646         if (cmdline_mode->rb || cmdline_mode->margins)
1647                 goto create_mode;
1648
1649         prefer_non_interlace = !cmdline_mode->interlace;
1650 again:
1651         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1652                 /* check width/height */
1653                 if (mode->hdisplay != cmdline_mode->xres ||
1654                     mode->vdisplay != cmdline_mode->yres)
1655                         continue;
1656
1657                 if (cmdline_mode->refresh_specified) {
1658                         if (mode->vrefresh != cmdline_mode->refresh)
1659                                 continue;
1660                 }
1661
1662                 if (cmdline_mode->interlace) {
1663                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1664                                 continue;
1665                 } else if (prefer_non_interlace) {
1666                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1667                                 continue;
1668                 }
1669                 return mode;
1670         }
1671
1672         if (prefer_non_interlace) {
1673                 prefer_non_interlace = false;
1674                 goto again;
1675         }
1676
1677 create_mode:
1678         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1679                                                  cmdline_mode);
1680         list_add(&mode->head, &fb_helper_conn->connector->modes);
1681         return mode;
1682 }
1683 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1684
1685 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1686 {
1687         bool enable;
1688
1689         if (strict)
1690                 enable = connector->status == connector_status_connected;
1691         else
1692                 enable = connector->status != connector_status_disconnected;
1693
1694         return enable;
1695 }
1696
1697 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1698                                   bool *enabled)
1699 {
1700         bool any_enabled = false;
1701         struct drm_connector *connector;
1702         int i = 0;
1703
1704         for (i = 0; i < fb_helper->connector_count; i++) {
1705                 connector = fb_helper->connector_info[i]->connector;
1706                 enabled[i] = drm_connector_enabled(connector, true);
1707                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1708                           enabled[i] ? "yes" : "no");
1709                 any_enabled |= enabled[i];
1710         }
1711
1712         if (any_enabled)
1713                 return;
1714
1715         for (i = 0; i < fb_helper->connector_count; i++) {
1716                 connector = fb_helper->connector_info[i]->connector;
1717                 enabled[i] = drm_connector_enabled(connector, false);
1718         }
1719 }
1720
1721 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1722                               struct drm_display_mode **modes,
1723                               struct drm_fb_offset *offsets,
1724                               bool *enabled, int width, int height)
1725 {
1726         int count, i, j;
1727         bool can_clone = false;
1728         struct drm_fb_helper_connector *fb_helper_conn;
1729         struct drm_display_mode *dmt_mode, *mode;
1730
1731         /* only contemplate cloning in the single crtc case */
1732         if (fb_helper->crtc_count > 1)
1733                 return false;
1734
1735         count = 0;
1736         for (i = 0; i < fb_helper->connector_count; i++) {
1737                 if (enabled[i])
1738                         count++;
1739         }
1740
1741         /* only contemplate cloning if more than one connector is enabled */
1742         if (count <= 1)
1743                 return false;
1744
1745         /* check the command line or if nothing common pick 1024x768 */
1746         can_clone = true;
1747         for (i = 0; i < fb_helper->connector_count; i++) {
1748                 if (!enabled[i])
1749                         continue;
1750                 fb_helper_conn = fb_helper->connector_info[i];
1751                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1752                 if (!modes[i]) {
1753                         can_clone = false;
1754                         break;
1755                 }
1756                 for (j = 0; j < i; j++) {
1757                         if (!enabled[j])
1758                                 continue;
1759                         if (!drm_mode_equal(modes[j], modes[i]))
1760                                 can_clone = false;
1761                 }
1762         }
1763
1764         if (can_clone) {
1765                 DRM_DEBUG_KMS("can clone using command line\n");
1766                 return true;
1767         }
1768
1769         /* try and find a 1024x768 mode on each connector */
1770         can_clone = true;
1771         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1772
1773         for (i = 0; i < fb_helper->connector_count; i++) {
1774
1775                 if (!enabled[i])
1776                         continue;
1777
1778                 fb_helper_conn = fb_helper->connector_info[i];
1779                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1780                         if (drm_mode_equal(mode, dmt_mode))
1781                                 modes[i] = mode;
1782                 }
1783                 if (!modes[i])
1784                         can_clone = false;
1785         }
1786
1787         if (can_clone) {
1788                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1789                 return true;
1790         }
1791         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1792         return false;
1793 }
1794
1795 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1796                                 struct drm_display_mode **modes,
1797                                 struct drm_fb_offset *offsets,
1798                                 int idx,
1799                                 int h_idx, int v_idx)
1800 {
1801         struct drm_fb_helper_connector *fb_helper_conn;
1802         int i;
1803         int hoffset = 0, voffset = 0;
1804
1805         for (i = 0; i < fb_helper->connector_count; i++) {
1806                 fb_helper_conn = fb_helper->connector_info[i];
1807                 if (!fb_helper_conn->connector->has_tile)
1808                         continue;
1809
1810                 if (!modes[i] && (h_idx || v_idx)) {
1811                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1812                                       fb_helper_conn->connector->base.id);
1813                         continue;
1814                 }
1815                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1816                         hoffset += modes[i]->hdisplay;
1817
1818                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1819                         voffset += modes[i]->vdisplay;
1820         }
1821         offsets[idx].x = hoffset;
1822         offsets[idx].y = voffset;
1823         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1824         return 0;
1825 }
1826
1827 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1828                                  struct drm_display_mode **modes,
1829                                  struct drm_fb_offset *offsets,
1830                                  bool *enabled, int width, int height)
1831 {
1832         struct drm_fb_helper_connector *fb_helper_conn;
1833         int i;
1834         uint64_t conn_configured = 0, mask;
1835         int tile_pass = 0;
1836         mask = (1 << fb_helper->connector_count) - 1;
1837 retry:
1838         for (i = 0; i < fb_helper->connector_count; i++) {
1839                 fb_helper_conn = fb_helper->connector_info[i];
1840
1841                 if (conn_configured & (1 << i))
1842                         continue;
1843
1844                 if (enabled[i] == false) {
1845                         conn_configured |= (1 << i);
1846                         continue;
1847                 }
1848
1849                 /* first pass over all the untiled connectors */
1850                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1851                         continue;
1852
1853                 if (tile_pass == 1) {
1854                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1855                             fb_helper_conn->connector->tile_v_loc != 0)
1856                                 continue;
1857
1858                 } else {
1859                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1860                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1861                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1862                                 continue;
1863
1864                         /* find the tile offsets for this pass - need
1865                            to find all tiles left and above */
1866                         drm_get_tile_offsets(fb_helper, modes, offsets,
1867                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1868                 }
1869                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1870                               fb_helper_conn->connector->base.id);
1871
1872                 /* got for command line mode first */
1873                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1874                 if (!modes[i]) {
1875                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1876                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1877                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1878                 }
1879                 /* No preferred modes, pick one off the list */
1880                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1881                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1882                                 break;
1883                 }
1884                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1885                           "none");
1886                 conn_configured |= (1 << i);
1887         }
1888
1889         if ((conn_configured & mask) != mask) {
1890                 tile_pass++;
1891                 goto retry;
1892         }
1893         return true;
1894 }
1895
1896 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1897                           struct drm_fb_helper_crtc **best_crtcs,
1898                           struct drm_display_mode **modes,
1899                           int n, int width, int height)
1900 {
1901         int c, o;
1902         struct drm_device *dev = fb_helper->dev;
1903         struct drm_connector *connector;
1904         const struct drm_connector_helper_funcs *connector_funcs;
1905         struct drm_encoder *encoder;
1906         int my_score, best_score, score;
1907         struct drm_fb_helper_crtc **crtcs, *crtc;
1908         struct drm_fb_helper_connector *fb_helper_conn;
1909
1910         if (n == fb_helper->connector_count)
1911                 return 0;
1912
1913         fb_helper_conn = fb_helper->connector_info[n];
1914         connector = fb_helper_conn->connector;
1915
1916         best_crtcs[n] = NULL;
1917         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1918         if (modes[n] == NULL)
1919                 return best_score;
1920
1921         crtcs = kzalloc(dev->mode_config.num_connector *
1922                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1923         if (!crtcs)
1924                 return best_score;
1925
1926         my_score = 1;
1927         if (connector->status == connector_status_connected)
1928                 my_score++;
1929         if (drm_has_cmdline_mode(fb_helper_conn))
1930                 my_score++;
1931         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1932                 my_score++;
1933
1934         connector_funcs = connector->helper_private;
1935         encoder = connector_funcs->best_encoder(connector);
1936         if (!encoder)
1937                 goto out;
1938
1939         /* select a crtc for this connector and then attempt to configure
1940            remaining connectors */
1941         for (c = 0; c < fb_helper->crtc_count; c++) {
1942                 crtc = &fb_helper->crtc_info[c];
1943
1944                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1945                         continue;
1946
1947                 for (o = 0; o < n; o++)
1948                         if (best_crtcs[o] == crtc)
1949                                 break;
1950
1951                 if (o < n) {
1952                         /* ignore cloning unless only a single crtc */
1953                         if (fb_helper->crtc_count > 1)
1954                                 continue;
1955
1956                         if (!drm_mode_equal(modes[o], modes[n]))
1957                                 continue;
1958                 }
1959
1960                 crtcs[n] = crtc;
1961                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1962                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1963                                                   width, height);
1964                 if (score > best_score) {
1965                         best_score = score;
1966                         memcpy(best_crtcs, crtcs,
1967                                dev->mode_config.num_connector *
1968                                sizeof(struct drm_fb_helper_crtc *));
1969                 }
1970         }
1971 out:
1972         kfree(crtcs);
1973         return best_score;
1974 }
1975
1976 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1977 {
1978         struct drm_device *dev = fb_helper->dev;
1979         struct drm_fb_helper_crtc **crtcs;
1980         struct drm_display_mode **modes;
1981         struct drm_fb_offset *offsets;
1982         struct drm_mode_set *modeset;
1983         bool *enabled;
1984         int width, height;
1985         int i;
1986
1987         DRM_DEBUG_KMS("\n");
1988
1989         width = dev->mode_config.max_width;
1990         height = dev->mode_config.max_height;
1991
1992         crtcs = kcalloc(dev->mode_config.num_connector,
1993                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1994         modes = kcalloc(dev->mode_config.num_connector,
1995                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1996         offsets = kcalloc(dev->mode_config.num_connector,
1997                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1998         enabled = kcalloc(dev->mode_config.num_connector,
1999                           sizeof(bool), GFP_KERNEL);
2000         if (!crtcs || !modes || !enabled || !offsets) {
2001                 DRM_ERROR("Memory allocation failed\n");
2002                 goto out;
2003         }
2004
2005
2006         drm_enable_connectors(fb_helper, enabled);
2007
2008         if (!(fb_helper->funcs->initial_config &&
2009               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2010                                                offsets,
2011                                                enabled, width, height))) {
2012                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
2013                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
2014                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
2015
2016                 if (!drm_target_cloned(fb_helper, modes, offsets,
2017                                        enabled, width, height) &&
2018                     !drm_target_preferred(fb_helper, modes, offsets,
2019                                           enabled, width, height))
2020                         DRM_ERROR("Unable to find initial modes\n");
2021
2022                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2023                               width, height);
2024
2025                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2026         }
2027
2028         /* need to set the modesets up here for use later */
2029         /* fill out the connector<->crtc mappings into the modesets */
2030         for (i = 0; i < fb_helper->crtc_count; i++) {
2031                 modeset = &fb_helper->crtc_info[i].mode_set;
2032                 modeset->num_connectors = 0;
2033                 modeset->fb = NULL;
2034         }
2035
2036         for (i = 0; i < fb_helper->connector_count; i++) {
2037                 struct drm_display_mode *mode = modes[i];
2038                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2039                 struct drm_fb_offset *offset = &offsets[i];
2040                 modeset = &fb_crtc->mode_set;
2041
2042                 if (mode && fb_crtc) {
2043                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2044                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2045                         fb_crtc->desired_mode = mode;
2046                         fb_crtc->x = offset->x;
2047                         fb_crtc->y = offset->y;
2048                         if (modeset->mode)
2049                                 drm_mode_destroy(dev, modeset->mode);
2050                         modeset->mode = drm_mode_duplicate(dev,
2051                                                            fb_crtc->desired_mode);
2052                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
2053                         modeset->fb = fb_helper->fb;
2054                         modeset->x = offset->x;
2055                         modeset->y = offset->y;
2056                 }
2057         }
2058
2059         /* Clear out any old modes if there are no more connected outputs. */
2060         for (i = 0; i < fb_helper->crtc_count; i++) {
2061                 modeset = &fb_helper->crtc_info[i].mode_set;
2062                 if (modeset->num_connectors == 0) {
2063                         BUG_ON(modeset->fb);
2064                         if (modeset->mode)
2065                                 drm_mode_destroy(dev, modeset->mode);
2066                         modeset->mode = NULL;
2067                 }
2068         }
2069 out:
2070         kfree(crtcs);
2071         kfree(modes);
2072         kfree(offsets);
2073         kfree(enabled);
2074 }
2075
2076 /**
2077  * drm_fb_helper_initial_config - setup a sane initial connector configuration
2078  * @fb_helper: fb_helper device struct
2079  * @bpp_sel: bpp value to use for the framebuffer configuration
2080  *
2081  * Scans the CRTCs and connectors and tries to put together an initial setup.
2082  * At the moment, this is a cloned configuration across all heads with
2083  * a new framebuffer object as the backing store.
2084  *
2085  * Note that this also registers the fbdev and so allows userspace to call into
2086  * the driver through the fbdev interfaces.
2087  *
2088  * This function will call down into the ->fb_probe callback to let
2089  * the driver allocate and initialize the fbdev info structure and the drm
2090  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2091  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2092  * values for the fbdev info structure.
2093  *
2094  * RETURNS:
2095  * Zero if everything went ok, nonzero otherwise.
2096  */
2097 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2098 {
2099         struct drm_device *dev = fb_helper->dev;
2100         int count = 0;
2101
2102         if (!drm_fbdev_emulation)
2103                 return 0;
2104
2105         mutex_lock(&dev->mode_config.mutex);
2106         count = drm_fb_helper_probe_connector_modes(fb_helper,
2107                                                     dev->mode_config.max_width,
2108                                                     dev->mode_config.max_height);
2109         mutex_unlock(&dev->mode_config.mutex);
2110         /*
2111          * we shouldn't end up with no modes here.
2112          */
2113         if (count == 0)
2114                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2115
2116         drm_setup_crtcs(fb_helper);
2117
2118         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2119 }
2120 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2121
2122 /**
2123  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2124  *                               probing all the outputs attached to the fb
2125  * @fb_helper: the drm_fb_helper
2126  *
2127  * Scan the connectors attached to the fb_helper and try to put together a
2128  * setup after *notification of a change in output configuration.
2129  *
2130  * Called at runtime, takes the mode config locks to be able to check/change the
2131  * modeset configuration. Must be run from process context (which usually means
2132  * either the output polling work or a work item launched from the driver's
2133  * hotplug interrupt).
2134  *
2135  * Note that drivers may call this even before calling
2136  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
2137  * for a race-free fbcon setup and will make sure that the fbdev emulation will
2138  * not miss any hotplug events.
2139  *
2140  * RETURNS:
2141  * 0 on success and a non-zero error code otherwise.
2142  */
2143 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2144 {
2145         struct drm_device *dev = fb_helper->dev;
2146         u32 max_width, max_height;
2147
2148         if (!drm_fbdev_emulation)
2149                 return 0;
2150
2151         mutex_lock(&fb_helper->dev->mode_config.mutex);
2152         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2153                 fb_helper->delayed_hotplug = true;
2154                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2155                 return 0;
2156         }
2157         DRM_DEBUG_KMS("\n");
2158
2159         max_width = fb_helper->fb->width;
2160         max_height = fb_helper->fb->height;
2161
2162         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2163         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2164
2165         drm_modeset_lock_all(dev);
2166         drm_setup_crtcs(fb_helper);
2167         drm_modeset_unlock_all(dev);
2168         drm_fb_helper_set_par(fb_helper->fbdev);
2169
2170         return 0;
2171 }
2172 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2173
2174 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2175  * but the module doesn't depend on any fb console symbols.  At least
2176  * attempt to load fbcon to avoid leaving the system without a usable console.
2177  */
2178 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2179 static int __init drm_fb_helper_modinit(void)
2180 {
2181         const char *name = "fbcon";
2182         struct module *fbcon;
2183
2184         mutex_lock(&module_mutex);
2185         fbcon = find_module(name);
2186         mutex_unlock(&module_mutex);
2187
2188         if (!fbcon)
2189                 request_module_nowait(name);
2190         return 0;
2191 }
2192
2193 module_init(drm_fb_helper_modinit);
2194 #endif