sys/dev/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/fb.h>
  33 #include <linux/module.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_crtc.h>
  36 #include <drm/drm_fb_helper.h>
  37 #include <drm/drm_crtc_helper.h>
  38 #include <drm/drm_atomic.h>
  39 #include <drm/drm_atomic_helper.h>
  40
  41 static bool drm_fbdev_emulation = true;
  42 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
  43 MODULE_PARM_DESC(fbdev_emulation,
  44                  "Enable legacy fbdev emulation [default=true]");
  45
  46 static LINUX_LIST_HEAD(kernel_fb_helper_list);
  47
  48 /**
  49  * DOC: fbdev helpers
  50  *
  51  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  52  * mode setting driver. They can be used mostly independently from the crtc
  53  * helper functions used by many drivers to implement the kernel mode setting
  54  * interfaces.
  55  *
  56  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  57  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  58  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  59  * default behaviour can override the third step with their own code.
  60  * Teardown is done with drm_fb_helper_fini().
  61  *
  62  * At runtime drivers should restore the fbdev console by calling
  63  * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
  64  * They should also notify the fb helper code from updates to the output
  65  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  66  * integration with the output polling code in drm_crtc_helper.c the modeset
  67  * code provides a ->output_poll_changed callback.
  68  *
  69  * All other functions exported by the fb helper library can be used to
  70  * implement the fbdev driver interface by the driver.
  71  *
  72  * It is possible, though perhaps somewhat tricky, to implement race-free
  73  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  74  * helper must be called first to initialize the minimum required to make
  75  * hotplug detection work. Drivers also need to make sure to properly set up
  76  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  77  * it is safe to enable interrupts and start processing hotplug events. At the
  78  * same time, drivers should initialize all modeset objects such as CRTCs,
  79  * encoders and connectors. To finish up the fbdev helper initialization, the
  80  * drm_fb_helper_init() function is called. To probe for all attached displays
  81  * and set up an initial configuration using the detected hardware, drivers
  82  * should call drm_fb_helper_single_add_all_connectors() followed by
  83  * drm_fb_helper_initial_config().
  84  */
  85
  86 /**
  87  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  88  *                                             emulation helper
  89  * @fb_helper: fbdev initialized with drm_fb_helper_init
  90  *
  91  * This functions adds all the available connectors for use with the given
  92  * fb_helper. This is a separate step to allow drivers to freely assign
  93  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  94  * not adequate to be used for the fbcon.
  95  *
  96  * This function is protected against concurrent connector hotadds/removals
  97  * using drm_fb_helper_add_one_connector() and
  98  * drm_fb_helper_remove_one_connector().
  99  */
 100 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 101 {
 102         struct drm_device *dev = fb_helper->dev;
 103         struct drm_connector *connector;
 104         int i;
 105
 106         if (!drm_fbdev_emulation)
 107                 return 0;
 108
 109         mutex_lock(&dev->mode_config.mutex);
 110         drm_for_each_connector(connector, dev) {
 111                 struct drm_fb_helper_connector *fb_helper_connector;
 112
 113                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 114                 if (!fb_helper_connector)
 115                         goto fail;
 116
 117                 fb_helper_connector->connector = connector;
 118                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 119         }
 120         mutex_unlock(&dev->mode_config.mutex);
 121         return 0;
 122 fail:
 123         for (i = 0; i < fb_helper->connector_count; i++) {
 124                 kfree(fb_helper->connector_info[i]);
 125                 fb_helper->connector_info[i] = NULL;
 126         }
 127         fb_helper->connector_count = 0;
 128         mutex_unlock(&dev->mode_config.mutex);
 129
 130         return -ENOMEM;
 131 }
 132 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 133
 134 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 135 {
 136         struct drm_fb_helper_connector **temp;
 137         struct drm_fb_helper_connector *fb_helper_connector;
 138
 139         if (!drm_fbdev_emulation)
 140                 return 0;
 141
 142         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 143         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 144                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), M_DRM, M_WAITOK);
 145                 if (!temp)
 146                         return -ENOMEM;
 147
 148                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 149                 fb_helper->connector_info = temp;
 150         }
 151
 152
 153         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 154         if (!fb_helper_connector)
 155                 return -ENOMEM;
 156
 157         fb_helper_connector->connector = connector;
 158         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 159         return 0;
 160 }
 161 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 162
 163 static void remove_from_modeset(struct drm_mode_set *set,
 164                 struct drm_connector *connector)
 165 {
 166         int i, j;
 167
 168         for (i = 0; i < set->num_connectors; i++) {
 169                 if (set->connectors[i] == connector)
 170                         break;
 171         }
 172
 173         if (i == set->num_connectors)
 174                 return;
 175
 176         for (j = i + 1; j < set->num_connectors; j++) {
 177                 set->connectors[j - 1] = set->connectors[j];
 178         }
 179         set->num_connectors--;
 180
 181         /*
 182          * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 183          */
 184         if (set->num_connectors == 0) {
 185                 set->fb = NULL;
 186                 drm_mode_destroy(connector->dev, set->mode);
 187                 set->mode = NULL;
 188         }
 189 }
 190
 191 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 192                                        struct drm_connector *connector)
 193 {
 194         struct drm_fb_helper_connector *fb_helper_connector;
 195         int i, j;
 196
 197         if (!drm_fbdev_emulation)
 198                 return 0;
 199
 200         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 201
 202         for (i = 0; i < fb_helper->connector_count; i++) {
 203                 if (fb_helper->connector_info[i]->connector == connector)
 204                         break;
 205         }
 206
 207         if (i == fb_helper->connector_count)
 208                 return -EINVAL;
 209         fb_helper_connector = fb_helper->connector_info[i];
 210
 211         for (j = i + 1; j < fb_helper->connector_count; j++) {
 212                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 213         }
 214         fb_helper->connector_count--;
 215         kfree(fb_helper_connector);
 216
 217         /* also cleanup dangling references to the connector: */
 218         for (i = 0; i < fb_helper->crtc_count; i++)
 219                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 220
 221         return 0;
 222 }
 223 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 224
 225 #if 0
 226 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 227 {
 228         uint16_t *r_base, *g_base, *b_base;
 229         int i;
 230
 231         if (helper->funcs->gamma_get == NULL)
 232                 return;
 233
 234         r_base = crtc->gamma_store;
 235         g_base = r_base + crtc->gamma_size;
 236         b_base = g_base + crtc->gamma_size;
 237
 238         for (i = 0; i < crtc->gamma_size; i++)
 239                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 240 }
 241
 242 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 243 {
 244         uint16_t *r_base, *g_base, *b_base;
 245
 246         if (crtc->funcs->gamma_set == NULL)
 247                 return;
 248
 249         r_base = crtc->gamma_store;
 250         g_base = r_base + crtc->gamma_size;
 251         b_base = g_base + crtc->gamma_size;
 252
 253         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 254 }
 255
 256 /**
 257  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 258  * @info: fbdev registered by the helper
 259  */
 260 int drm_fb_helper_debug_enter(struct fb_info *info)
 261 {
 262         struct drm_fb_helper *helper = info->par;
 263         const struct drm_crtc_helper_funcs *funcs;
 264         int i;
 265
 266         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 267                 for (i = 0; i < helper->crtc_count; i++) {
 268                         struct drm_mode_set *mode_set =
 269                                 &helper->crtc_info[i].mode_set;
 270
 271                         if (!mode_set->crtc->enabled)
 272                                 continue;
 273
 274                         funcs = mode_set->crtc->helper_private;
 275                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 276                         funcs->mode_set_base_atomic(mode_set->crtc,
 277                                                     mode_set->fb,
 278                                                     mode_set->x,
 279                                                     mode_set->y,
 280                                                     ENTER_ATOMIC_MODE_SET);
 281                 }
 282         }
 283
 284         return 0;
 285 }
 286 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 287
 288 /* Find the real fb for a given fb helper CRTC */
 289 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 290 {
 291         struct drm_device *dev = crtc->dev;
 292         struct drm_crtc *c;
 293
 294         drm_for_each_crtc(c, dev) {
 295                 if (crtc->base.id == c->base.id)
 296                         return c->primary->fb;
 297         }
 298
 299         return NULL;
 300 }
 301
 302 /**
 303  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 304  * @info: fbdev registered by the helper
 305  */
 306 int drm_fb_helper_debug_leave(struct fb_info *info)
 307 {
 308         struct drm_fb_helper *helper = info->par;
 309         struct drm_crtc *crtc;
 310         const struct drm_crtc_helper_funcs *funcs;
 311         struct drm_framebuffer *fb;
 312         int i;
 313
 314         for (i = 0; i < helper->crtc_count; i++) {
 315                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 316                 crtc = mode_set->crtc;
 317                 funcs = crtc->helper_private;
 318                 fb = drm_mode_config_fb(crtc);
 319
 320                 if (!crtc->enabled)
 321                         continue;
 322
 323                 if (!fb) {
 324                         DRM_ERROR("no fb to restore??\n");
 325                         continue;
 326                 }
 327
 328                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 329                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 330                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 331         }
 332
 333         return 0;
 334 }
 335 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 336 #endif
 337
 338 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
 339 {
 340         struct drm_device *dev = fb_helper->dev;
 341         struct drm_plane *plane;
 342         struct drm_atomic_state *state;
 343         int i, ret;
 344         unsigned plane_mask;
 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         plane_mask = 0;
 353         drm_for_each_plane(plane, dev) {
 354                 struct drm_plane_state *plane_state;
 355
 356                 plane_state = drm_atomic_get_plane_state(state, plane);
 357                 if (IS_ERR(plane_state)) {
 358                         ret = PTR_ERR(plane_state);
 359                         goto fail;
 360                 }
 361
 362                 plane_state->rotation = BIT(DRM_ROTATE_0);
 363
 364                 plane->old_fb = plane->fb;
 365                 plane_mask |= 1 << drm_plane_index(plane);
 366
 367                 /* disable non-primary: */
 368                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 369                         continue;
 370
 371                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
 372                 if (ret != 0)
 373                         goto fail;
 374         }
 375
 376         for(i = 0; i < fb_helper->crtc_count; i++) {
 377                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 378
 379                 ret = __drm_atomic_helper_set_config(mode_set, state);
 380                 if (ret != 0)
 381                         goto fail;
 382         }
 383
 384         ret = drm_atomic_commit(state);
 385
 386 fail:
 387         drm_atomic_clean_old_fb(dev, plane_mask, ret);
 388
 389         if (ret == -EDEADLK)
 390                 goto backoff;
 391
 392         if (ret != 0)
 393                 drm_atomic_state_free(state);
 394
 395         return ret;
 396
 397 backoff:
 398         drm_atomic_state_clear(state);
 399         drm_atomic_legacy_backoff(state);
 400
 401         goto retry;
 402 }
 403
 404 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 405 {
 406         struct drm_device *dev = fb_helper->dev;
 407         struct drm_plane *plane;
 408         bool error = false;
 409         int i;
 410
 411         drm_warn_on_modeset_not_all_locked(dev);
 412
 413         if (fb_helper->atomic)
 414                 return restore_fbdev_mode_atomic(fb_helper);
 415
 416         drm_for_each_plane(plane, dev) {
 417                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 418                         drm_plane_force_disable(plane);
 419
 420                 if (dev->mode_config.rotation_property) {
 421                         drm_mode_plane_set_obj_prop(plane,
 422                                                     dev->mode_config.rotation_property,
 423                                                     BIT(DRM_ROTATE_0));
 424                 }
 425         }
 426
 427         for (i = 0; i < fb_helper->crtc_count; i++) {
 428                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 429                 struct drm_crtc *crtc = mode_set->crtc;
 430                 int ret;
 431
 432                 if (crtc->funcs->cursor_set) {
 433                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 434                         if (ret)
 435                                 error = true;
 436                 }
 437
 438                 ret = drm_mode_set_config_internal(mode_set);
 439                 if (ret)
 440                         error = true;
 441         }
 442         return error;
 443 }
 444
 445 /**
 446  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 447  * @fb_helper: fbcon to restore
 448  *
 449  * This should be called from driver's drm ->lastclose callback
 450  * when implementing an fbcon on top of kms using this helper. This ensures that
 451  * the user isn't greeted with a black screen when e.g. X dies.
 452  *
 453  * RETURNS:
 454  * Zero if everything went ok, negative error code otherwise.
 455  */
 456 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 457 {
 458         struct drm_device *dev = fb_helper->dev;
 459         bool do_delayed;
 460         int ret;
 461
 462         if (!drm_fbdev_emulation)
 463                 return -ENODEV;
 464
 465         drm_modeset_lock_all(dev);
 466         ret = restore_fbdev_mode(fb_helper);
 467
 468         do_delayed = fb_helper->delayed_hotplug;
 469         if (do_delayed)
 470                 fb_helper->delayed_hotplug = false;
 471         drm_modeset_unlock_all(dev);
 472
 473         if (do_delayed)
 474                 drm_fb_helper_hotplug_event(fb_helper);
 475         return ret;
 476 }
 477 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 478
 479 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 480 {
 481         struct drm_device *dev = fb_helper->dev;
 482         struct drm_crtc *crtc;
 483         int bound = 0, crtcs_bound = 0;
 484
 485         /* Sometimes user space wants everything disabled, so don't steal the
 486          * display if there's a master. */
 487 #if 0
 488         if (dev->primary->master)
 489                 return false;
 490 #endif
 491
 492         drm_for_each_crtc(crtc, dev) {
 493                 if (crtc->primary->fb)
 494                         crtcs_bound++;
 495                 if (crtc->primary->fb == fb_helper->fb)
 496                         bound++;
 497         }
 498
 499         if (bound < crtcs_bound)
 500                 return false;
 501
 502         return true;
 503 }
 504
 505 #ifdef CONFIG_MAGIC_SYSRQ
 506 /*
 507  * restore fbcon display for all kms driver's using this helper, used for sysrq
 508  * and panic handling.
 509  */
 510 static bool drm_fb_helper_force_kernel_mode(void)
 511 {
 512         bool ret, error = false;
 513         struct drm_fb_helper *helper;
 514
 515         if (list_empty(&kernel_fb_helper_list))
 516                 return false;
 517
 518         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 519                 struct drm_device *dev = helper->dev;
 520
 521                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 522                         continue;
 523
 524                 drm_modeset_lock_all(dev);
 525                 ret = restore_fbdev_mode(helper);
 526                 if (ret)
 527                         error = true;
 528                 drm_modeset_unlock_all(dev);
 529         }
 530         return error;
 531 }
 532
 533 #if 0
 534 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 535 {
 536         bool ret;
 537         ret = drm_fb_helper_force_kernel_mode();
 538         if (ret == true)
 539                 DRM_ERROR("Failed to restore crtc configuration\n");
 540 }
 541 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 542
 543 static void drm_fb_helper_sysrq(int dummy1)
 544 {
 545         schedule_work(&drm_fb_helper_restore_work);
 546 }
 547
 548 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 549         .handler = drm_fb_helper_sysrq,
 550         .help_msg = "force-fb(V)",
 551         .action_msg = "Restore framebuffer console",
 552 };
 553 #else
 554 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 555 #endif
 556
 557 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 558 {
 559         struct drm_fb_helper *fb_helper = info->par;
 560         struct drm_device *dev = fb_helper->dev;
 561         struct drm_crtc *crtc;
 562         struct drm_connector *connector;
 563         int i, j;
 564
 565         /*
 566          * For each CRTC in this fb, turn the connectors on/off.
 567          */
 568         drm_modeset_lock_all(dev);
 569         if (!drm_fb_helper_is_bound(fb_helper)) {
 570                 drm_modeset_unlock_all(dev);
 571                 return;
 572         }
 573
 574         for (i = 0; i < fb_helper->crtc_count; i++) {
 575                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 576
 577                 if (!crtc->enabled)
 578                         continue;
 579
 580                 /* Walk the connectors & encoders on this fb turning them on/off */
 581                 for (j = 0; j < fb_helper->connector_count; j++) {
 582                         connector = fb_helper->connector_info[j]->connector;
 583                         connector->funcs->dpms(connector, dpms_mode);
 584                         drm_object_property_set_value(&connector->base,
 585                                 dev->mode_config.dpms_property, dpms_mode);
 586                 }
 587         }
 588         drm_modeset_unlock_all(dev);
 589 }
 590
 591 /**
 592  * drm_fb_helper_blank - implementation for ->fb_blank
 593  * @blank: desired blanking state
 594  * @info: fbdev registered by the helper
 595  */
 596 int drm_fb_helper_blank(int blank, struct fb_info *info)
 597 {
 598         if (oops_in_progress)
 599                 return -EBUSY;
 600
 601         switch (blank) {
 602         /* Display: On; HSync: On, VSync: On */
 603         case FB_BLANK_UNBLANK:
 604                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 605                 break;
 606         /* Display: Off; HSync: On, VSync: On */
 607         case FB_BLANK_NORMAL:
 608                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 609                 break;
 610         /* Display: Off; HSync: Off, VSync: On */
 611         case FB_BLANK_HSYNC_SUSPEND:
 612                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 613                 break;
 614         /* Display: Off; HSync: On, VSync: Off */
 615         case FB_BLANK_VSYNC_SUSPEND:
 616                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 617                 break;
 618         /* Display: Off; HSync: Off, VSync: Off */
 619         case FB_BLANK_POWERDOWN:
 620                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 621                 break;
 622         }
 623         return 0;
 624 }
 625 EXPORT_SYMBOL(drm_fb_helper_blank);
 626 #endif
 627
 628 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 629 {
 630         int i;
 631
 632         for (i = 0; i < helper->connector_count; i++)
 633                 kfree(helper->connector_info[i]);
 634         kfree(helper->connector_info);
 635         for (i = 0; i < helper->crtc_count; i++) {
 636                 kfree(helper->crtc_info[i].mode_set.connectors);
 637                 if (helper->crtc_info[i].mode_set.mode)
 638                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 639         }
 640         kfree(helper->crtc_info);
 641 }
 642
 643 /**
 644  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 645  * @dev: DRM device
 646  * @helper: driver-allocated fbdev helper structure to set up
 647  * @funcs: pointer to structure of functions associate with this helper
 648  *
 649  * Sets up the bare minimum to make the framebuffer helper usable. This is
 650  * useful to implement race-free initialization of the polling helpers.
 651  */
 652 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 653                            const struct drm_fb_helper_funcs *funcs)
 654 {
 655         INIT_LIST_HEAD(&helper->kernel_fb_list);
 656         helper->funcs = funcs;
 657         helper->dev = dev;
 658 }
 659 EXPORT_SYMBOL(drm_fb_helper_prepare);
 660
 661 /**
 662  * drm_fb_helper_init - initialize a drm_fb_helper structure
 663  * @dev: drm device
 664  * @fb_helper: driver-allocated fbdev helper structure to initialize
 665  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 666  * @max_conn_count: max connector count
 667  *
 668  * This allocates the structures for the fbdev helper with the given limits.
 669  * Note that this won't yet touch the hardware (through the driver interfaces)
 670  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 671  * to allow driver writes more control over the exact init sequence.
 672  *
 673  * Drivers must call drm_fb_helper_prepare() before calling this function.
 674  *
 675  * RETURNS:
 676  * Zero if everything went ok, nonzero otherwise.
 677  */
 678 int drm_fb_helper_init(struct drm_device *dev,
 679                        struct drm_fb_helper *fb_helper,
 680                        int crtc_count, int max_conn_count)
 681 {
 682         struct drm_crtc *crtc;
 683         int i;
 684
 685         if (!drm_fbdev_emulation)
 686                 return 0;
 687
 688         if (!max_conn_count)
 689                 return -EINVAL;
 690
 691         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 692         if (!fb_helper->crtc_info)
 693                 return -ENOMEM;
 694
 695         fb_helper->crtc_count = crtc_count;
 696         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 697         if (!fb_helper->connector_info) {
 698                 kfree(fb_helper->crtc_info);
 699                 return -ENOMEM;
 700         }
 701         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 702         fb_helper->connector_count = 0;
 703
 704         for (i = 0; i < crtc_count; i++) {
 705                 fb_helper->crtc_info[i].mode_set.connectors =
 706                         kcalloc(max_conn_count,
 707                                 sizeof(struct drm_connector *),
 708                                 GFP_KERNEL);
 709
 710                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 711                         goto out_free;
 712                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 713         }
 714
 715         i = 0;
 716         drm_for_each_crtc(crtc, dev) {
 717                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 718                 i++;
 719         }
 720
 721         fb_helper->atomic = !!drm_core_check_feature(dev, DRIVER_ATOMIC);
 722
 723         return 0;
 724 out_free:
 725         drm_fb_helper_crtc_free(fb_helper);
 726         return -ENOMEM;
 727 }
 728 EXPORT_SYMBOL(drm_fb_helper_init);
 729
 730 /**
 731  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 732  * @fb_helper: driver-allocated fbdev helper
 733  *
 734  * A helper to alloc fb_info and the members cmap and apertures. Called
 735  * by the driver within the fb_probe fb_helper callback function.
 736  *
 737  * RETURNS:
 738  * fb_info pointer if things went okay, pointer containing error code
 739  * otherwise
 740  */
 741 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 742 {
 743         struct fb_info *info;
 744
 745         info = kmalloc(sizeof(struct fb_info), M_DRM, M_WAITOK | M_ZERO);
 746         if (!info)
 747                 return ERR_PTR(-ENOMEM);
 748
 749 #if 0
 750         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 751         if (ret)
 752                 goto err_release;
 753
 754         info->apertures = alloc_apertures(1);
 755         if (!info->apertures) {
 756                 ret = -ENOMEM;
 757                 goto err_free_cmap;
 758         }
 759 #endif
 760
 761         fb_helper->fbdev = info;
 762
 763         return info;
 764
 765 #if 0
 766 err_free_cmap:
 767         fb_dealloc_cmap(&info->cmap);
 768 err_release:
 769         framebuffer_release(info);
 770         return ERR_PTR(ret);
 771 #endif
 772 }
 773 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 774
 775 #if 0
 776 /**
 777  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 778  * @fb_helper: driver-allocated fbdev helper
 779  *
 780  * A wrapper around unregister_framebuffer, to release the fb_info
 781  * framebuffer device
 782  */
 783 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 784 {
 785         if (fb_helper && fb_helper->fbdev)
 786                 unregister_framebuffer(fb_helper->fbdev);
 787 }
 788 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 789
 790 /**
 791  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 792  * @fb_helper: driver-allocated fbdev helper
 793  *
 794  * A helper to free memory taken by fb_info and the members cmap and
 795  * apertures
 796  */
 797 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 798 {
 799         if (fb_helper) {
 800                 struct fb_info *info = fb_helper->fbdev;
 801
 802                 if (info) {
 803                         if (info->cmap.len)
 804                                 fb_dealloc_cmap(&info->cmap);
 805                         framebuffer_release(info);
 806                 }
 807
 808                 fb_helper->fbdev = NULL;
 809         }
 810 }
 811 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 812 #endif
 813
 814 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 815 {
 816         if (!drm_fbdev_emulation)
 817                 return;
 818
 819         if (!list_empty(&fb_helper->kernel_fb_list)) {
 820                 list_del(&fb_helper->kernel_fb_list);
 821                 if (list_empty(&kernel_fb_helper_list)) {
 822 #if 0
 823                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 824 #endif
 825                 }
 826         }
 827
 828         drm_fb_helper_crtc_free(fb_helper);
 829
 830 }
 831 EXPORT_SYMBOL(drm_fb_helper_fini);
 832
 833 #if 0
 834 /**
 835  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 836  * @fb_helper: driver-allocated fbdev helper
 837  *
 838  * A wrapper around unlink_framebuffer implemented by fbdev core
 839  */
 840 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 841 {
 842         if (fb_helper && fb_helper->fbdev)
 843                 unlink_framebuffer(fb_helper->fbdev);
 844 }
 845 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 846
 847 /**
 848  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 849  * @info: fb_info struct pointer
 850  * @buf: userspace buffer to read from framebuffer memory
 851  * @count: number of bytes to read from framebuffer memory
 852  * @ppos: read offset within framebuffer memory
 853  *
 854  * A wrapper around fb_sys_read implemented by fbdev core
 855  */
 856 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 857                                size_t count, loff_t *ppos)
 858 {
 859         return fb_sys_read(info, buf, count, ppos);
 860 }
 861 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 862
 863 /**
 864  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 865  * @info: fb_info struct pointer
 866  * @buf: userspace buffer to write to framebuffer memory
 867  * @count: number of bytes to write to framebuffer memory
 868  * @ppos: write offset within framebuffer memory
 869  *
 870  * A wrapper around fb_sys_write implemented by fbdev core
 871  */
 872 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 873                                 size_t count, loff_t *ppos)
 874 {
 875         return fb_sys_write(info, buf, count, ppos);
 876 }
 877 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 878
 879 /**
 880  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 881  * @info: fbdev registered by the helper
 882  * @rect: info about rectangle to fill
 883  *
 884  * A wrapper around sys_fillrect implemented by fbdev core
 885  */
 886 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 887                                 const struct fb_fillrect *rect)
 888 {
 889         sys_fillrect(info, rect);
 890 }
 891 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 892
 893 /**
 894  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 895  * @info: fbdev registered by the helper
 896  * @area: info about area to copy
 897  *
 898  * A wrapper around sys_copyarea implemented by fbdev core
 899  */
 900 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 901                                 const struct fb_copyarea *area)
 902 {
 903         sys_copyarea(info, area);
 904 }
 905 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 906
 907 /**
 908  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 909  * @info: fbdev registered by the helper
 910  * @image: info about image to blit
 911  *
 912  * A wrapper around sys_imageblit implemented by fbdev core
 913  */
 914 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 915                                  const struct fb_image *image)
 916 {
 917         sys_imageblit(info, image);
 918 }
 919 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 920
 921 /**
 922  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 923  * @info: fbdev registered by the helper
 924  * @rect: info about rectangle to fill
 925  *
 926  * A wrapper around cfb_imageblit implemented by fbdev core
 927  */
 928 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 929                                 const struct fb_fillrect *rect)
 930 {
 931         cfb_fillrect(info, rect);
 932 }
 933 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 934
 935 /**
 936  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 937  * @info: fbdev registered by the helper
 938  * @area: info about area to copy
 939  *
 940  * A wrapper around cfb_copyarea implemented by fbdev core
 941  */
 942 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 943                                 const struct fb_copyarea *area)
 944 {
 945         cfb_copyarea(info, area);
 946 }
 947 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
 948
 949 /**
 950  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
 951  * @info: fbdev registered by the helper
 952  * @image: info about image to blit
 953  *
 954  * A wrapper around cfb_imageblit implemented by fbdev core
 955  */
 956 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 957                                  const struct fb_image *image)
 958 {
 959         cfb_imageblit(info, image);
 960 }
 961 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 962
 963 /**
 964  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
 965  * @fb_helper: driver-allocated fbdev helper
 966  * @state: desired state, zero to resume, non-zero to suspend
 967  *
 968  * A wrapper around fb_set_suspend implemented by fbdev core
 969  */
 970 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
 971 {
 972         if (fb_helper && fb_helper->fbdev)
 973                 fb_set_suspend(fb_helper->fbdev, state);
 974 }
 975 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
 976
 977 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 978                      u16 blue, u16 regno, struct fb_info *info)
 979 {
 980         struct drm_fb_helper *fb_helper = info->par;
 981         struct drm_framebuffer *fb = fb_helper->fb;
 982         int pindex;
 983
 984         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 985                 u32 *palette;
 986                 u32 value;
 987                 /* place color in psuedopalette */
 988                 if (regno > 16)
 989                         return -EINVAL;
 990                 palette = (u32 *)info->pseudo_palette;
 991                 red >>= (16 - info->var.red.length);
 992                 green >>= (16 - info->var.green.length);
 993                 blue >>= (16 - info->var.blue.length);
 994                 value = (red << info->var.red.offset) |
 995                         (green << info->var.green.offset) |
 996                         (blue << info->var.blue.offset);
 997                 if (info->var.transp.length > 0) {
 998                         u32 mask = (1 << info->var.transp.length) - 1;
 999                         mask <<= info->var.transp.offset;
1000                         value |= mask;
1001                 }
1002                 palette[regno] = value;
1003                 return 0;
1004         }
1005
1006         /*
1007          * The driver really shouldn't advertise pseudo/directcolor
1008          * visuals if it can't deal with the palette.
1009          */
1010         if (WARN_ON(!fb_helper->funcs->gamma_set ||
1011                     !fb_helper->funcs->gamma_get))
1012                 return -EINVAL;
1013
1014         pindex = regno;
1015
1016         if (fb->bits_per_pixel == 16) {
1017                 pindex = regno << 3;
1018
1019                 if (fb->depth == 16 && regno > 63)
1020                         return -EINVAL;
1021                 if (fb->depth == 15 && regno > 31)
1022                         return -EINVAL;
1023
1024                 if (fb->depth == 16) {
1025                         u16 r, g, b;
1026                         int i;
1027                         if (regno < 32) {
1028                                 for (i = 0; i < 8; i++)
1029                                         fb_helper->funcs->gamma_set(crtc, red,
1030                                                 green, blue, pindex + i);
1031                         }
1032
1033                         fb_helper->funcs->gamma_get(crtc, &r,
1034                                                     &g, &b,
1035                                                     pindex >> 1);
1036
1037                         for (i = 0; i < 4; i++)
1038                                 fb_helper->funcs->gamma_set(crtc, r,
1039                                                             green, b,
1040                                                             (pindex >> 1) + i);
1041                 }
1042         }
1043
1044         if (fb->depth != 16)
1045                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
1046         return 0;
1047 }
1048
1049 /**
1050  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1051  * @cmap: cmap to set
1052  * @info: fbdev registered by the helper
1053  */
1054 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1055 {
1056         struct drm_fb_helper *fb_helper = info->par;
1057         struct drm_device *dev = fb_helper->dev;
1058         const struct drm_crtc_helper_funcs *crtc_funcs;
1059         u16 *red, *green, *blue, *transp;
1060         struct drm_crtc *crtc;
1061         int i, j, rc = 0;
1062         int start;
1063
1064         if (oops_in_progress)
1065                 return -EBUSY;
1066
1067         drm_modeset_lock_all(dev);
1068         if (!drm_fb_helper_is_bound(fb_helper)) {
1069                 drm_modeset_unlock_all(dev);
1070                 return -EBUSY;
1071         }
1072
1073         for (i = 0; i < fb_helper->crtc_count; i++) {
1074                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1075                 crtc_funcs = crtc->helper_private;
1076
1077                 red = cmap->red;
1078                 green = cmap->green;
1079                 blue = cmap->blue;
1080                 transp = cmap->transp;
1081                 start = cmap->start;
1082
1083                 for (j = 0; j < cmap->len; j++) {
1084                         u16 hred, hgreen, hblue, htransp = 0xffff;
1085
1086                         hred = *red++;
1087                         hgreen = *green++;
1088                         hblue = *blue++;
1089
1090                         if (transp)
1091                                 htransp = *transp++;
1092
1093                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1094                         if (rc)
1095                                 goto out;
1096                 }
1097                 if (crtc_funcs->load_lut)
1098                         crtc_funcs->load_lut(crtc);
1099         }
1100  out:
1101         drm_modeset_unlock_all(dev);
1102         return rc;
1103 }
1104 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1105
1106 /**
1107  * drm_fb_helper_check_var - implementation for ->fb_check_var
1108  * @var: screeninfo to check
1109  * @info: fbdev registered by the helper
1110  */
1111 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1112                             struct fb_info *info)
1113 {
1114         struct drm_fb_helper *fb_helper = info->par;
1115         struct drm_framebuffer *fb = fb_helper->fb;
1116         int depth;
1117
1118         if (var->pixclock != 0 || in_dbg_master())
1119                 return -EINVAL;
1120
1121         /* Need to resize the fb object !!! */
1122         if (var->bits_per_pixel > fb->bits_per_pixel ||
1123             var->xres > fb->width || var->yres > fb->height ||
1124             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1125                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1126                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1127                           var->xres, var->yres, var->bits_per_pixel,
1128                           var->xres_virtual, var->yres_virtual,
1129                           fb->width, fb->height, fb->bits_per_pixel);
1130                 return -EINVAL;
1131         }
1132
1133         switch (var->bits_per_pixel) {
1134         case 16:
1135                 depth = (var->green.length == 6) ? 16 : 15;
1136                 break;
1137         case 32:
1138                 depth = (var->transp.length > 0) ? 32 : 24;
1139                 break;
1140         default:
1141                 depth = var->bits_per_pixel;
1142                 break;
1143         }
1144
1145         switch (depth) {
1146         case 8:
1147                 var->red.offset = 0;
1148                 var->green.offset = 0;
1149                 var->blue.offset = 0;
1150                 var->red.length = 8;
1151                 var->green.length = 8;
1152                 var->blue.length = 8;
1153                 var->transp.length = 0;
1154                 var->transp.offset = 0;
1155                 break;
1156         case 15:
1157                 var->red.offset = 10;
1158                 var->green.offset = 5;
1159                 var->blue.offset = 0;
1160                 var->red.length = 5;
1161                 var->green.length = 5;
1162                 var->blue.length = 5;
1163                 var->transp.length = 1;
1164                 var->transp.offset = 15;
1165                 break;
1166         case 16:
1167                 var->red.offset = 11;
1168                 var->green.offset = 5;
1169                 var->blue.offset = 0;
1170                 var->red.length = 5;
1171                 var->green.length = 6;
1172                 var->blue.length = 5;
1173                 var->transp.length = 0;
1174                 var->transp.offset = 0;
1175                 break;
1176         case 24:
1177                 var->red.offset = 16;
1178                 var->green.offset = 8;
1179                 var->blue.offset = 0;
1180                 var->red.length = 8;
1181                 var->green.length = 8;
1182                 var->blue.length = 8;
1183                 var->transp.length = 0;
1184                 var->transp.offset = 0;
1185                 break;
1186         case 32:
1187                 var->red.offset = 16;
1188                 var->green.offset = 8;
1189                 var->blue.offset = 0;
1190                 var->red.length = 8;
1191                 var->green.length = 8;
1192                 var->blue.length = 8;
1193                 var->transp.length = 8;
1194                 var->transp.offset = 24;
1195                 break;
1196         default:
1197                 return -EINVAL;
1198         }
1199         return 0;
1200 }
1201 EXPORT_SYMBOL(drm_fb_helper_check_var);
1202
1203 /**
1204  * drm_fb_helper_set_par - implementation for ->fb_set_par
1205  * @info: fbdev registered by the helper
1206  *
1207  * This will let fbcon do the mode init and is called at initialization time by
1208  * the fbdev core when registering the driver, and later on through the hotplug
1209  * callback.
1210  */
1211 int drm_fb_helper_set_par(struct fb_info *info)
1212 {
1213         struct drm_fb_helper *fb_helper = info->par;
1214         struct fb_var_screeninfo *var = &info->var;
1215
1216         if (oops_in_progress)
1217                 return -EBUSY;
1218
1219         if (var->pixclock != 0) {
1220                 DRM_ERROR("PIXEL CLOCK SET\n");
1221                 return -EINVAL;
1222         }
1223
1224         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1225
1226         return 0;
1227 }
1228 EXPORT_SYMBOL(drm_fb_helper_set_par);
1229
1230 static int pan_display_atomic(struct fb_var_screeninfo *var,
1231                               struct fb_info *info)
1232 {
1233         struct drm_fb_helper *fb_helper = info->par;
1234         struct drm_device *dev = fb_helper->dev;
1235         struct drm_atomic_state *state;
1236         struct drm_plane *plane;
1237         int i, ret;
1238         unsigned plane_mask;
1239
1240         state = drm_atomic_state_alloc(dev);
1241         if (!state)
1242                 return -ENOMEM;
1243
1244         state->acquire_ctx = dev->mode_config.acquire_ctx;
1245 retry:
1246         plane_mask = 0;
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                 plane = mode_set->crtc->primary;
1260                 plane_mask |= 1 << drm_plane_index(plane);
1261                 plane->old_fb = plane->fb;
1262         }
1263
1264         ret = drm_atomic_commit(state);
1265         if (ret != 0)
1266                 goto fail;
1267
1268         info->var.xoffset = var->xoffset;
1269         info->var.yoffset = var->yoffset;
1270
1271
1272 fail:
1273         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1274
1275         if (ret == -EDEADLK)
1276                 goto backoff;
1277
1278         if (ret != 0)
1279                 drm_atomic_state_free(state);
1280
1281         return ret;
1282
1283 backoff:
1284         drm_atomic_state_clear(state);
1285         drm_atomic_legacy_backoff(state);
1286
1287         goto retry;
1288 }
1289
1290 /**
1291  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1292  * @var: updated screen information
1293  * @info: fbdev registered by the helper
1294  */
1295 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1296                               struct fb_info *info)
1297 {
1298         struct drm_fb_helper *fb_helper = info->par;
1299         struct drm_device *dev = fb_helper->dev;
1300         struct drm_mode_set *modeset;
1301         int ret = 0;
1302         int i;
1303
1304         if (oops_in_progress)
1305                 return -EBUSY;
1306
1307         drm_modeset_lock_all(dev);
1308         if (!drm_fb_helper_is_bound(fb_helper)) {
1309                 drm_modeset_unlock_all(dev);
1310                 return -EBUSY;
1311         }
1312
1313         if (fb_helper->atomic) {
1314                 ret = pan_display_atomic(var, info);
1315                 goto unlock;
1316         }
1317
1318         for (i = 0; i < fb_helper->crtc_count; i++) {
1319                 modeset = &fb_helper->crtc_info[i].mode_set;
1320
1321                 modeset->x = var->xoffset;
1322                 modeset->y = var->yoffset;
1323
1324                 if (modeset->num_connectors) {
1325                         ret = drm_mode_set_config_internal(modeset);
1326                         if (!ret) {
1327                                 info->var.xoffset = var->xoffset;
1328                                 info->var.yoffset = var->yoffset;
1329                         }
1330                 }
1331         }
1332 unlock:
1333         drm_modeset_unlock_all(dev);
1334         return ret;
1335 }
1336 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1337 #endif
1338
1339 #ifdef __DragonFly__
1340 static void
1341 do_restore_fbdev_mode(void *context, int pending)
1342 {
1343         struct drm_fb_helper *fb_helper = context;
1344
1345         if (!fb_helper->fb)
1346                 return;
1347
1348         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1349 }
1350
1351 static void
1352 sc_restore_fbdev_mode(void *cookie)
1353 {
1354         struct drm_fb_helper *fb_helper = cookie;
1355
1356         if (!fb_helper->fb)
1357                 return;
1358
1359         taskqueue_enqueue(taskqueue_thread[0], &fb_helper->fb_mode_task);
1360 }
1361 #endif
1362
1363 /*
1364  * Allocates the backing storage and sets up the fbdev info structure through
1365  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1366  * notifier.
1367  */
1368 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1369                                          int preferred_bpp)
1370 {
1371         int ret = 0;
1372         int crtc_count = 0;
1373         int i;
1374         struct fb_info *info;
1375         struct drm_fb_helper_surface_size sizes;
1376         int gamma_size = 0;
1377 #ifdef __DragonFly__
1378         int kms_console = 1;
1379 #endif
1380
1381         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1382         sizes.surface_depth = 24;
1383         sizes.surface_bpp = 32;
1384         sizes.fb_width = (unsigned)-1;
1385         sizes.fb_height = (unsigned)-1;
1386
1387         /* if driver picks 8 or 16 by default use that
1388            for both depth/bpp */
1389         if (preferred_bpp != sizes.surface_bpp)
1390                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1391
1392         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1393         for (i = 0; i < fb_helper->connector_count; i++) {
1394                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1395                 struct drm_cmdline_mode *cmdline_mode;
1396
1397                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1398
1399                 if (cmdline_mode->bpp_specified) {
1400                         switch (cmdline_mode->bpp) {
1401                         case 8:
1402                                 sizes.surface_depth = sizes.surface_bpp = 8;
1403                                 break;
1404                         case 15:
1405                                 sizes.surface_depth = 15;
1406                                 sizes.surface_bpp = 16;
1407                                 break;
1408                         case 16:
1409                                 sizes.surface_depth = sizes.surface_bpp = 16;
1410                                 break;
1411                         case 24:
1412                                 sizes.surface_depth = sizes.surface_bpp = 24;
1413                                 break;
1414                         case 32:
1415                                 sizes.surface_depth = 24;
1416                                 sizes.surface_bpp = 32;
1417                                 break;
1418                         }
1419                         break;
1420                 }
1421         }
1422
1423         crtc_count = 0;
1424         for (i = 0; i < fb_helper->crtc_count; i++) {
1425                 struct drm_display_mode *desired_mode;
1426                 struct drm_mode_set *mode_set;
1427                 int x, y, j;
1428                 /* in case of tile group, are we the last tile vert or horiz?
1429                  * If no tile group you are always the last one both vertically
1430                  * and horizontally
1431                  */
1432                 bool lastv = true, lasth = true;
1433
1434                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1435                 mode_set = &fb_helper->crtc_info[i].mode_set;
1436
1437                 if (!desired_mode)
1438                         continue;
1439
1440                 crtc_count++;
1441
1442                 x = fb_helper->crtc_info[i].x;
1443                 y = fb_helper->crtc_info[i].y;
1444
1445                 if (gamma_size == 0)
1446                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1447
1448                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1449                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1450
1451                 for (j = 0; j < mode_set->num_connectors; j++) {
1452                         struct drm_connector *connector = mode_set->connectors[j];
1453                         if (connector->has_tile) {
1454                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1455                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1456                                 /* cloning to multiple tiles is just crazy-talk, so: */
1457                                 break;
1458                         }
1459                 }
1460
1461                 if (lasth)
1462                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1463                 if (lastv)
1464                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1465         }
1466
1467         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1468                 /* hmm everyone went away - assume VGA cable just fell out
1469                    and will come back later. */
1470                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1471                 sizes.fb_width = sizes.surface_width = 1024;
1472                 sizes.fb_height = sizes.surface_height = 768;
1473         }
1474
1475         /* push down into drivers */
1476         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1477         if (ret < 0)
1478                 return ret;
1479
1480         info = fb_helper->fbdev;
1481
1482         /*
1483          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1484          * events, but at init time drm_setup_crtcs needs to be called before
1485          * the fb is allocated (since we need to figure out the desired size of
1486          * the fb before we can allocate it ...). Hence we need to fix things up
1487          * here again.
1488          */
1489         for (i = 0; i < fb_helper->crtc_count; i++)
1490                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1491                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1492
1493 #ifdef __DragonFly__
1494         TUNABLE_INT_FETCH("kern.kms_console", &kms_console);
1495         if (kms_console) {
1496                 TASK_INIT(&fb_helper->fb_mode_task, 0, do_restore_fbdev_mode,
1497                     fb_helper);
1498                 info->cookie = fb_helper;
1499                 info->restore = (void *)&sc_restore_fbdev_mode;
1500                 if (register_framebuffer(info) < 0)
1501                         return -EINVAL;
1502         }
1503 #endif
1504
1505 #if 0
1506         info->var.pixclock = 0;
1507         if (register_framebuffer(info) < 0)
1508                 return -EINVAL;
1509
1510         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1511                         info->node, info->fix.id);
1512
1513         if (list_empty(&kernel_fb_helper_list)) {
1514                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1515         }
1516
1517         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1518 #endif
1519
1520         return 0;
1521 }
1522
1523 #if 0
1524 /**
1525  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1526  * @info: fbdev registered by the helper
1527  * @pitch: desired pitch
1528  * @depth: desired depth
1529  *
1530  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1531  * fbdev emulations. Drivers which support acceleration methods which impose
1532  * additional constraints need to set up their own limits.
1533  *
1534  * Drivers should call this (or their equivalent setup code) from their
1535  * ->fb_probe callback.
1536  */
1537 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1538                             uint32_t depth)
1539 {
1540         info->fix.type = FB_TYPE_PACKED_PIXELS;
1541         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1542                 FB_VISUAL_TRUECOLOR;
1543         info->fix.mmio_start = 0;
1544         info->fix.mmio_len = 0;
1545         info->fix.type_aux = 0;
1546         info->fix.xpanstep = 1; /* doing it in hw */
1547         info->fix.ypanstep = 1; /* doing it in hw */
1548         info->fix.ywrapstep = 0;
1549         info->fix.accel = FB_ACCEL_NONE;
1550
1551         info->fix.line_length = pitch;
1552         return;
1553 }
1554 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1555
1556 /**
1557  * drm_fb_helper_fill_var - initalizes variable fbdev information
1558  * @info: fbdev instance to set up
1559  * @fb_helper: fb helper instance to use as template
1560  * @fb_width: desired fb width
1561  * @fb_height: desired fb height
1562  *
1563  * Sets up the variable fbdev metainformation from the given fb helper instance
1564  * and the drm framebuffer allocated in fb_helper->fb.
1565  *
1566  * Drivers should call this (or their equivalent setup code) from their
1567  * ->fb_probe callback after having allocated the fbdev backing
1568  * storage framebuffer.
1569  */
1570 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1571                             uint32_t fb_width, uint32_t fb_height)
1572 {
1573         struct drm_framebuffer *fb = fb_helper->fb;
1574         info->pseudo_palette = fb_helper->pseudo_palette;
1575         info->var.xres_virtual = fb->width;
1576         info->var.yres_virtual = fb->height;
1577         info->var.bits_per_pixel = fb->bits_per_pixel;
1578         info->var.accel_flags = FB_ACCELF_TEXT;
1579         info->var.xoffset = 0;
1580         info->var.yoffset = 0;
1581         info->var.activate = FB_ACTIVATE_NOW;
1582         info->var.height = -1;
1583         info->var.width = -1;
1584
1585         switch (fb->depth) {
1586         case 8:
1587                 info->var.red.offset = 0;
1588                 info->var.green.offset = 0;
1589                 info->var.blue.offset = 0;
1590                 info->var.red.length = 8; /* 8bit DAC */
1591                 info->var.green.length = 8;
1592                 info->var.blue.length = 8;
1593                 info->var.transp.offset = 0;
1594                 info->var.transp.length = 0;
1595                 break;
1596         case 15:
1597                 info->var.red.offset = 10;
1598                 info->var.green.offset = 5;
1599                 info->var.blue.offset = 0;
1600                 info->var.red.length = 5;
1601                 info->var.green.length = 5;
1602                 info->var.blue.length = 5;
1603                 info->var.transp.offset = 15;
1604                 info->var.transp.length = 1;
1605                 break;
1606         case 16:
1607                 info->var.red.offset = 11;
1608                 info->var.green.offset = 5;
1609                 info->var.blue.offset = 0;
1610                 info->var.red.length = 5;
1611                 info->var.green.length = 6;
1612                 info->var.blue.length = 5;
1613                 info->var.transp.offset = 0;
1614                 break;
1615         case 24:
1616                 info->var.red.offset = 16;
1617                 info->var.green.offset = 8;
1618                 info->var.blue.offset = 0;
1619                 info->var.red.length = 8;
1620                 info->var.green.length = 8;
1621                 info->var.blue.length = 8;
1622                 info->var.transp.offset = 0;
1623                 info->var.transp.length = 0;
1624                 break;
1625         case 32:
1626                 info->var.red.offset = 16;
1627                 info->var.green.offset = 8;
1628                 info->var.blue.offset = 0;
1629                 info->var.red.length = 8;
1630                 info->var.green.length = 8;
1631                 info->var.blue.length = 8;
1632                 info->var.transp.offset = 24;
1633                 info->var.transp.length = 8;
1634                 break;
1635         default:
1636                 break;
1637         }
1638
1639         info->var.xres = fb_width;
1640         info->var.yres = fb_height;
1641 }
1642 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1643 #endif
1644
1645 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1646                                                uint32_t maxX,
1647                                                uint32_t maxY)
1648 {
1649         struct drm_connector *connector;
1650         int count = 0;
1651         int i;
1652
1653         for (i = 0; i < fb_helper->connector_count; i++) {
1654                 connector = fb_helper->connector_info[i]->connector;
1655                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1656         }
1657
1658         return count;
1659 }
1660
1661 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1662 {
1663         struct drm_display_mode *mode;
1664
1665         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1666                 if (mode->hdisplay > width ||
1667                     mode->vdisplay > height)
1668                         continue;
1669                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1670                         return mode;
1671         }
1672         return NULL;
1673 }
1674 EXPORT_SYMBOL(drm_has_preferred_mode);
1675
1676 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1677 {
1678         return fb_connector->connector->cmdline_mode.specified;
1679 }
1680
1681 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1682                                                       int width, int height)
1683 {
1684         struct drm_cmdline_mode *cmdline_mode;
1685         struct drm_display_mode *mode;
1686         bool prefer_non_interlace;
1687
1688         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1689         if (cmdline_mode->specified == false)
1690                 return NULL;
1691
1692         /* attempt to find a matching mode in the list of modes
1693          *  we have gotten so far, if not add a CVT mode that conforms
1694          */
1695         if (cmdline_mode->rb || cmdline_mode->margins)
1696                 goto create_mode;
1697
1698         prefer_non_interlace = !cmdline_mode->interlace;
1699 again:
1700         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1701                 /* check width/height */
1702                 if (mode->hdisplay != cmdline_mode->xres ||
1703                     mode->vdisplay != cmdline_mode->yres)
1704                         continue;
1705
1706                 if (cmdline_mode->refresh_specified) {
1707                         if (mode->vrefresh != cmdline_mode->refresh)
1708                                 continue;
1709                 }
1710
1711                 if (cmdline_mode->interlace) {
1712                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1713                                 continue;
1714                 } else if (prefer_non_interlace) {
1715                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1716                                 continue;
1717                 }
1718                 return mode;
1719         }
1720
1721         if (prefer_non_interlace) {
1722                 prefer_non_interlace = false;
1723                 goto again;
1724         }
1725
1726 create_mode:
1727         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1728                                                  cmdline_mode);
1729         list_add(&mode->head, &fb_helper_conn->connector->modes);
1730         return mode;
1731 }
1732 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1733
1734 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1735 {
1736         bool enable;
1737
1738         if (strict)
1739                 enable = connector->status == connector_status_connected;
1740         else
1741                 enable = connector->status != connector_status_disconnected;
1742
1743         return enable;
1744 }
1745
1746 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1747                                   bool *enabled)
1748 {
1749         bool any_enabled = false;
1750         struct drm_connector *connector;
1751         int i = 0;
1752
1753         for (i = 0; i < fb_helper->connector_count; i++) {
1754                 connector = fb_helper->connector_info[i]->connector;
1755                 enabled[i] = drm_connector_enabled(connector, true);
1756                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1757                           enabled[i] ? "yes" : "no");
1758                 any_enabled |= enabled[i];
1759         }
1760
1761         if (any_enabled)
1762                 return;
1763
1764         for (i = 0; i < fb_helper->connector_count; i++) {
1765                 connector = fb_helper->connector_info[i]->connector;
1766                 enabled[i] = drm_connector_enabled(connector, false);
1767         }
1768 }
1769
1770 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1771                               struct drm_display_mode **modes,
1772                               struct drm_fb_offset *offsets,
1773                               bool *enabled, int width, int height)
1774 {
1775         int count, i, j;
1776         bool can_clone = false;
1777         struct drm_fb_helper_connector *fb_helper_conn;
1778         struct drm_display_mode *dmt_mode, *mode;
1779
1780         /* only contemplate cloning in the single crtc case */
1781         if (fb_helper->crtc_count > 1)
1782                 return false;
1783
1784         count = 0;
1785         for (i = 0; i < fb_helper->connector_count; i++) {
1786                 if (enabled[i])
1787                         count++;
1788         }
1789
1790         /* only contemplate cloning if more than one connector is enabled */
1791         if (count <= 1)
1792                 return false;
1793
1794         /* check the command line or if nothing common pick 1024x768 */
1795         can_clone = true;
1796         for (i = 0; i < fb_helper->connector_count; i++) {
1797                 if (!enabled[i])
1798                         continue;
1799                 fb_helper_conn = fb_helper->connector_info[i];
1800                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1801                 if (!modes[i]) {
1802                         can_clone = false;
1803                         break;
1804                 }
1805                 for (j = 0; j < i; j++) {
1806                         if (!enabled[j])
1807                                 continue;
1808                         if (!drm_mode_equal(modes[j], modes[i]))
1809                                 can_clone = false;
1810                 }
1811         }
1812
1813         if (can_clone) {
1814                 DRM_DEBUG_KMS("can clone using command line\n");
1815                 return true;
1816         }
1817
1818         /* try and find a 1024x768 mode on each connector */
1819         can_clone = true;
1820         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1821
1822         for (i = 0; i < fb_helper->connector_count; i++) {
1823
1824                 if (!enabled[i])
1825                         continue;
1826
1827                 fb_helper_conn = fb_helper->connector_info[i];
1828                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1829                         if (drm_mode_equal(mode, dmt_mode))
1830                                 modes[i] = mode;
1831                 }
1832                 if (!modes[i])
1833                         can_clone = false;
1834         }
1835
1836         if (can_clone) {
1837                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1838                 return true;
1839         }
1840         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1841         return false;
1842 }
1843
1844 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1845                                 struct drm_display_mode **modes,
1846                                 struct drm_fb_offset *offsets,
1847                                 int idx,
1848                                 int h_idx, int v_idx)
1849 {
1850         struct drm_fb_helper_connector *fb_helper_conn;
1851         int i;
1852         int hoffset = 0, voffset = 0;
1853
1854         for (i = 0; i < fb_helper->connector_count; i++) {
1855                 fb_helper_conn = fb_helper->connector_info[i];
1856                 if (!fb_helper_conn->connector->has_tile)
1857                         continue;
1858
1859                 if (!modes[i] && (h_idx || v_idx)) {
1860                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1861                                       fb_helper_conn->connector->base.id);
1862                         continue;
1863                 }
1864                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1865                         hoffset += modes[i]->hdisplay;
1866
1867                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1868                         voffset += modes[i]->vdisplay;
1869         }
1870         offsets[idx].x = hoffset;
1871         offsets[idx].y = voffset;
1872         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1873         return 0;
1874 }
1875
1876 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1877                                  struct drm_display_mode **modes,
1878                                  struct drm_fb_offset *offsets,
1879                                  bool *enabled, int width, int height)
1880 {
1881         struct drm_fb_helper_connector *fb_helper_conn;
1882         int i;
1883         uint64_t conn_configured = 0, mask;
1884         int tile_pass = 0;
1885         mask = (1 << fb_helper->connector_count) - 1;
1886 retry:
1887         for (i = 0; i < fb_helper->connector_count; i++) {
1888                 fb_helper_conn = fb_helper->connector_info[i];
1889
1890                 if (conn_configured & (1 << i))
1891                         continue;
1892
1893                 if (enabled[i] == false) {
1894                         conn_configured |= (1 << i);
1895                         continue;
1896                 }
1897
1898                 /* first pass over all the untiled connectors */
1899                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1900                         continue;
1901
1902                 if (tile_pass == 1) {
1903                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1904                             fb_helper_conn->connector->tile_v_loc != 0)
1905                                 continue;
1906
1907                 } else {
1908                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1909                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1910                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1911                                 continue;
1912
1913                         /* find the tile offsets for this pass - need
1914                            to find all tiles left and above */
1915                         drm_get_tile_offsets(fb_helper, modes, offsets,
1916                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1917                 }
1918                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1919                               fb_helper_conn->connector->base.id);
1920
1921                 /* got for command line mode first */
1922                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1923                 if (!modes[i]) {
1924                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1925                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1926                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1927                 }
1928                 /* No preferred modes, pick one off the list */
1929                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1930                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1931                                 break;
1932                 }
1933                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1934                           "none");
1935                 conn_configured |= (1 << i);
1936         }
1937
1938         if ((conn_configured & mask) != mask) {
1939                 tile_pass++;
1940                 goto retry;
1941         }
1942         return true;
1943 }
1944
1945 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1946                           struct drm_fb_helper_crtc **best_crtcs,
1947                           struct drm_display_mode **modes,
1948                           int n, int width, int height)
1949 {
1950         int c, o;
1951         struct drm_device *dev = fb_helper->dev;
1952         struct drm_connector *connector;
1953         const struct drm_connector_helper_funcs *connector_funcs;
1954         struct drm_encoder *encoder;
1955         int my_score, best_score, score;
1956         struct drm_fb_helper_crtc **crtcs, *crtc;
1957         struct drm_fb_helper_connector *fb_helper_conn;
1958
1959         if (n == fb_helper->connector_count)
1960                 return 0;
1961
1962         fb_helper_conn = fb_helper->connector_info[n];
1963         connector = fb_helper_conn->connector;
1964
1965         best_crtcs[n] = NULL;
1966         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1967         if (modes[n] == NULL)
1968                 return best_score;
1969
1970         crtcs = kzalloc(dev->mode_config.num_connector *
1971                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1972         if (!crtcs)
1973                 return best_score;
1974
1975         my_score = 1;
1976         if (connector->status == connector_status_connected)
1977                 my_score++;
1978         if (drm_has_cmdline_mode(fb_helper_conn))
1979                 my_score++;
1980         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1981                 my_score++;
1982
1983         connector_funcs = connector->helper_private;
1984         encoder = connector_funcs->best_encoder(connector);
1985         if (!encoder)
1986                 goto out;
1987
1988         /* select a crtc for this connector and then attempt to configure
1989            remaining connectors */
1990         for (c = 0; c < fb_helper->crtc_count; c++) {
1991                 crtc = &fb_helper->crtc_info[c];
1992
1993                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1994                         continue;
1995
1996                 for (o = 0; o < n; o++)
1997                         if (best_crtcs[o] == crtc)
1998                                 break;
1999
2000                 if (o < n) {
2001                         /* ignore cloning unless only a single crtc */
2002                         if (fb_helper->crtc_count > 1)
2003                                 continue;
2004
2005                         if (!drm_mode_equal(modes[o], modes[n]))
2006                                 continue;
2007                 }
2008
2009                 crtcs[n] = crtc;
2010                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2011                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2012                                                   width, height);
2013                 if (score > best_score) {
2014                         best_score = score;
2015                         memcpy(best_crtcs, crtcs,
2016                                dev->mode_config.num_connector *
2017                                sizeof(struct drm_fb_helper_crtc *));
2018                 }
2019         }
2020 out:
2021         kfree(crtcs);
2022         return best_score;
2023 }
2024
2025 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
2026 {
2027         struct drm_device *dev = fb_helper->dev;
2028         struct drm_fb_helper_crtc **crtcs;
2029         struct drm_display_mode **modes;
2030         struct drm_fb_offset *offsets;
2031         struct drm_mode_set *modeset;
2032         bool *enabled;
2033         int width, height;
2034         int i;
2035
2036         DRM_DEBUG_KMS("\n");
2037
2038         width = dev->mode_config.max_width;
2039         height = dev->mode_config.max_height;
2040
2041         crtcs = kcalloc(dev->mode_config.num_connector,
2042                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2043         modes = kcalloc(dev->mode_config.num_connector,
2044                         sizeof(struct drm_display_mode *), GFP_KERNEL);
2045         offsets = kcalloc(dev->mode_config.num_connector,
2046                           sizeof(struct drm_fb_offset), GFP_KERNEL);
2047         enabled = kcalloc(dev->mode_config.num_connector,
2048                           sizeof(bool), GFP_KERNEL);
2049         if (!crtcs || !modes || !enabled || !offsets) {
2050                 DRM_ERROR("Memory allocation failed\n");
2051                 goto out;
2052         }
2053
2054
2055         drm_enable_connectors(fb_helper, enabled);
2056
2057         if (!(fb_helper->funcs->initial_config &&
2058               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2059                                                offsets,
2060                                                enabled, width, height))) {
2061                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
2062                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
2063                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
2064
2065                 if (!drm_target_cloned(fb_helper, modes, offsets,
2066                                        enabled, width, height) &&
2067                     !drm_target_preferred(fb_helper, modes, offsets,
2068                                           enabled, width, height))
2069                         DRM_ERROR("Unable to find initial modes\n");
2070
2071                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2072                               width, height);
2073
2074                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2075         }
2076
2077         /* need to set the modesets up here for use later */
2078         /* fill out the connector<->crtc mappings into the modesets */
2079         for (i = 0; i < fb_helper->crtc_count; i++) {
2080                 modeset = &fb_helper->crtc_info[i].mode_set;
2081                 modeset->num_connectors = 0;
2082                 modeset->fb = NULL;
2083         }
2084
2085         for (i = 0; i < fb_helper->connector_count; i++) {
2086                 struct drm_display_mode *mode = modes[i];
2087                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2088                 struct drm_fb_offset *offset = &offsets[i];
2089                 modeset = &fb_crtc->mode_set;
2090
2091                 if (mode && fb_crtc) {
2092                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2093                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2094                         fb_crtc->desired_mode = mode;
2095                         fb_crtc->x = offset->x;
2096                         fb_crtc->y = offset->y;
2097                         if (modeset->mode)
2098                                 drm_mode_destroy(dev, modeset->mode);
2099                         modeset->mode = drm_mode_duplicate(dev,
2100                                                            fb_crtc->desired_mode);
2101                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
2102                         modeset->fb = fb_helper->fb;
2103                         modeset->x = offset->x;
2104                         modeset->y = offset->y;
2105                 }
2106         }
2107
2108         /* Clear out any old modes if there are no more connected outputs. */
2109         for (i = 0; i < fb_helper->crtc_count; i++) {
2110                 modeset = &fb_helper->crtc_info[i].mode_set;
2111                 if (modeset->num_connectors == 0) {
2112                         BUG_ON(modeset->fb);
2113                         if (modeset->mode)
2114                                 drm_mode_destroy(dev, modeset->mode);
2115                         modeset->mode = NULL;
2116                 }
2117         }
2118 out:
2119         kfree(crtcs);
2120         kfree(modes);
2121         kfree(offsets);
2122         kfree(enabled);
2123 }
2124
2125 /**
2126  * drm_fb_helper_initial_config - setup a sane initial connector configuration
2127  * @fb_helper: fb_helper device struct
2128  * @bpp_sel: bpp value to use for the framebuffer configuration
2129  *
2130  * Scans the CRTCs and connectors and tries to put together an initial setup.
2131  * At the moment, this is a cloned configuration across all heads with
2132  * a new framebuffer object as the backing store.
2133  *
2134  * Note that this also registers the fbdev and so allows userspace to call into
2135  * the driver through the fbdev interfaces.
2136  *
2137  * This function will call down into the ->fb_probe callback to let
2138  * the driver allocate and initialize the fbdev info structure and the drm
2139  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2140  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2141  * values for the fbdev info structure.
2142  *
2143  * RETURNS:
2144  * Zero if everything went ok, nonzero otherwise.
2145  */
2146 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2147 {
2148         struct drm_device *dev = fb_helper->dev;
2149         int count = 0;
2150
2151         if (!drm_fbdev_emulation)
2152                 return 0;
2153
2154         mutex_lock(&dev->mode_config.mutex);
2155         count = drm_fb_helper_probe_connector_modes(fb_helper,
2156                                                     dev->mode_config.max_width,
2157                                                     dev->mode_config.max_height);
2158         mutex_unlock(&dev->mode_config.mutex);
2159         /*
2160          * we shouldn't end up with no modes here.
2161          */
2162         if (count == 0)
2163                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2164
2165         drm_setup_crtcs(fb_helper);
2166
2167         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2168 }
2169 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2170
2171 /**
2172  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2173  *                               probing all the outputs attached to the fb
2174  * @fb_helper: the drm_fb_helper
2175  *
2176  * Scan the connectors attached to the fb_helper and try to put together a
2177  * setup after *notification of a change in output configuration.
2178  *
2179  * Called at runtime, takes the mode config locks to be able to check/change the
2180  * modeset configuration. Must be run from process context (which usually means
2181  * either the output polling work or a work item launched from the driver's
2182  * hotplug interrupt).
2183  *
2184  * Note that drivers may call this even before calling
2185  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
2186  * for a race-free fbcon setup and will make sure that the fbdev emulation will
2187  * not miss any hotplug events.
2188  *
2189  * RETURNS:
2190  * 0 on success and a non-zero error code otherwise.
2191  */
2192 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2193 {
2194         struct drm_device *dev = fb_helper->dev;
2195         u32 max_width, max_height;
2196
2197         if (!drm_fbdev_emulation)
2198                 return 0;
2199
2200         mutex_lock(&fb_helper->dev->mode_config.mutex);
2201         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2202                 fb_helper->delayed_hotplug = true;
2203                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2204                 return 0;
2205         }
2206         DRM_DEBUG_KMS("\n");
2207
2208         max_width = fb_helper->fb->width;
2209         max_height = fb_helper->fb->height;
2210
2211         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2212         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2213
2214         drm_modeset_lock_all(dev);
2215         drm_setup_crtcs(fb_helper);
2216         drm_modeset_unlock_all(dev);
2217 #if 0
2218         drm_fb_helper_set_par(fb_helper->fbdev);
2219 #endif
2220
2221         return 0;
2222 }
2223 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2224
2225 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2226  * but the module doesn't depend on any fb console symbols.  At least
2227  * attempt to load fbcon to avoid leaving the system without a usable console.
2228  */
2229 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2230 static int __init drm_fb_helper_modinit(void)
2231 {
2232         const char *name = "fbcon";
2233         struct module *fbcon;
2234
2235         mutex_lock(&module_mutex);
2236         fbcon = find_module(name);
2237         mutex_unlock(&module_mutex);
2238
2239         if (!fbcon)
2240                 request_module_nowait(name);
2241         return 0;
2242 }
2243
2244 module_init(drm_fb_helper_modinit);
2245 #endif