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, ret;
 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                 ret = drm_fb_helper_add_one_connector(fb_helper, connector);
 115
 116                 if (ret)
 117                         goto fail;
 118         }
 119         mutex_unlock(&dev->mode_config.mutex);
 120         return 0;
 121 fail:
 122         for (i = 0; i < fb_helper->connector_count; i++) {
 123                 kfree(fb_helper->connector_info[i]);
 124                 fb_helper->connector_info[i] = NULL;
 125         }
 126         fb_helper->connector_count = 0;
 127         mutex_unlock(&dev->mode_config.mutex);
 128
 129         return ret;
 130 }
 131 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 132
 133 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 134 {
 135         struct drm_fb_helper_connector **temp;
 136         struct drm_fb_helper_connector *fb_helper_connector;
 137
 138         if (!drm_fbdev_emulation)
 139                 return 0;
 140
 141         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 142         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 143                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 144                 if (!temp)
 145                         return -ENOMEM;
 146
 147                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 148                 fb_helper->connector_info = temp;
 149         }
 150
 151
 152         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 153         if (!fb_helper_connector)
 154                 return -ENOMEM;
 155
 156         fb_helper_connector->connector = connector;
 157         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 158         return 0;
 159 }
 160 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 161
 162 static void remove_from_modeset(struct drm_mode_set *set,
 163                 struct drm_connector *connector)
 164 {
 165         int i, j;
 166
 167         for (i = 0; i < set->num_connectors; i++) {
 168                 if (set->connectors[i] == connector)
 169                         break;
 170         }
 171
 172         if (i == set->num_connectors)
 173                 return;
 174
 175         for (j = i + 1; j < set->num_connectors; j++) {
 176                 set->connectors[j - 1] = set->connectors[j];
 177         }
 178         set->num_connectors--;
 179
 180         /*
 181          * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 182          */
 183         if (set->num_connectors == 0) {
 184                 set->fb = NULL;
 185                 drm_mode_destroy(connector->dev, set->mode);
 186                 set->mode = NULL;
 187         }
 188 }
 189
 190 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 191                                        struct drm_connector *connector)
 192 {
 193         struct drm_fb_helper_connector *fb_helper_connector;
 194         int i, j;
 195
 196         if (!drm_fbdev_emulation)
 197                 return 0;
 198
 199         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 200
 201         for (i = 0; i < fb_helper->connector_count; i++) {
 202                 if (fb_helper->connector_info[i]->connector == connector)
 203                         break;
 204         }
 205
 206         if (i == fb_helper->connector_count)
 207                 return -EINVAL;
 208         fb_helper_connector = fb_helper->connector_info[i];
 209
 210         for (j = i + 1; j < fb_helper->connector_count; j++) {
 211                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 212         }
 213         fb_helper->connector_count--;
 214         kfree(fb_helper_connector);
 215
 216         /* also cleanup dangling references to the connector: */
 217         for (i = 0; i < fb_helper->crtc_count; i++)
 218                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 219
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 223
 224 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 225 {
 226         uint16_t *r_base, *g_base, *b_base;
 227         int i;
 228
 229         if (helper->funcs->gamma_get == NULL)
 230                 return;
 231
 232         r_base = crtc->gamma_store;
 233         g_base = r_base + crtc->gamma_size;
 234         b_base = g_base + crtc->gamma_size;
 235
 236         for (i = 0; i < crtc->gamma_size; i++)
 237                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 238 }
 239
 240 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 241 {
 242         uint16_t *r_base, *g_base, *b_base;
 243
 244         if (crtc->funcs->gamma_set == NULL)
 245                 return;
 246
 247         r_base = crtc->gamma_store;
 248         g_base = r_base + crtc->gamma_size;
 249         b_base = g_base + crtc->gamma_size;
 250
 251         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 252 }
 253
 254 /**
 255  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 256  * @info: fbdev registered by the helper
 257  */
 258 int drm_fb_helper_debug_enter(struct fb_info *info)
 259 {
 260         struct drm_fb_helper *helper = info->par;
 261         const struct drm_crtc_helper_funcs *funcs;
 262         int i;
 263
 264         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 265                 for (i = 0; i < helper->crtc_count; i++) {
 266                         struct drm_mode_set *mode_set =
 267                                 &helper->crtc_info[i].mode_set;
 268
 269                         if (!mode_set->crtc->enabled)
 270                                 continue;
 271
 272                         funcs = mode_set->crtc->helper_private;
 273                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 274                         funcs->mode_set_base_atomic(mode_set->crtc,
 275                                                     mode_set->fb,
 276                                                     mode_set->x,
 277                                                     mode_set->y,
 278                                                     ENTER_ATOMIC_MODE_SET);
 279                 }
 280         }
 281
 282         return 0;
 283 }
 284 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 285
 286 /* Find the real fb for a given fb helper CRTC */
 287 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 288 {
 289         struct drm_device *dev = crtc->dev;
 290         struct drm_crtc *c;
 291
 292         drm_for_each_crtc(c, dev) {
 293                 if (crtc->base.id == c->base.id)
 294                         return c->primary->fb;
 295         }
 296
 297         return NULL;
 298 }
 299
 300 /**
 301  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 302  * @info: fbdev registered by the helper
 303  */
 304 int drm_fb_helper_debug_leave(struct fb_info *info)
 305 {
 306         struct drm_fb_helper *helper = info->par;
 307         struct drm_crtc *crtc;
 308         const struct drm_crtc_helper_funcs *funcs;
 309         struct drm_framebuffer *fb;
 310         int i;
 311
 312         for (i = 0; i < helper->crtc_count; i++) {
 313                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 314                 crtc = mode_set->crtc;
 315                 funcs = crtc->helper_private;
 316                 fb = drm_mode_config_fb(crtc);
 317
 318                 if (!crtc->enabled)
 319                         continue;
 320
 321                 if (!fb) {
 322                         DRM_ERROR("no fb to restore??\n");
 323                         continue;
 324                 }
 325
 326                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 327                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 328                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 329         }
 330
 331         return 0;
 332 }
 333 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 334
 335 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
 336 {
 337         struct drm_device *dev = fb_helper->dev;
 338         struct drm_plane *plane;
 339         struct drm_atomic_state *state;
 340         int i, ret;
 341         unsigned plane_mask;
 342
 343         state = drm_atomic_state_alloc(dev);
 344         if (!state)
 345                 return -ENOMEM;
 346
 347         state->acquire_ctx = dev->mode_config.acquire_ctx;
 348 retry:
 349         plane_mask = 0;
 350         drm_for_each_plane(plane, dev) {
 351                 struct drm_plane_state *plane_state;
 352
 353                 plane_state = drm_atomic_get_plane_state(state, plane);
 354                 if (IS_ERR(plane_state)) {
 355                         ret = PTR_ERR(plane_state);
 356                         goto fail;
 357                 }
 358
 359                 plane_state->rotation = BIT(DRM_ROTATE_0);
 360
 361                 plane->old_fb = plane->fb;
 362                 plane_mask |= 1 << drm_plane_index(plane);
 363
 364                 /* disable non-primary: */
 365                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 366                         continue;
 367
 368                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
 369                 if (ret != 0)
 370                         goto fail;
 371         }
 372
 373         for(i = 0; i < fb_helper->crtc_count; i++) {
 374                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 375
 376                 ret = __drm_atomic_helper_set_config(mode_set, state);
 377                 if (ret != 0)
 378                         goto fail;
 379         }
 380
 381         ret = drm_atomic_commit(state);
 382
 383 fail:
 384         drm_atomic_clean_old_fb(dev, plane_mask, ret);
 385
 386         if (ret == -EDEADLK)
 387                 goto backoff;
 388
 389         if (ret != 0)
 390                 drm_atomic_state_free(state);
 391
 392         return ret;
 393
 394 backoff:
 395         drm_atomic_state_clear(state);
 396         drm_atomic_legacy_backoff(state);
 397
 398         goto retry;
 399 }
 400
 401 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 402 {
 403         struct drm_device *dev = fb_helper->dev;
 404         struct drm_plane *plane;
 405         int i;
 406
 407         drm_warn_on_modeset_not_all_locked(dev);
 408
 409         if (fb_helper->atomic)
 410                 return restore_fbdev_mode_atomic(fb_helper);
 411
 412         drm_for_each_plane(plane, dev) {
 413                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 414                         drm_plane_force_disable(plane);
 415
 416                 if (dev->mode_config.rotation_property) {
 417                         drm_mode_plane_set_obj_prop(plane,
 418                                                     dev->mode_config.rotation_property,
 419                                                     BIT(DRM_ROTATE_0));
 420                 }
 421         }
 422
 423         for (i = 0; i < fb_helper->crtc_count; i++) {
 424                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 425                 struct drm_crtc *crtc = mode_set->crtc;
 426                 int ret;
 427
 428                 if (crtc->funcs->cursor_set2) {
 429                         ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
 430                         if (ret)
 431                                 return ret;
 432                 } else if (crtc->funcs->cursor_set) {
 433                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 434                         if (ret)
 435                                 return ret;
 436                 }
 437
 438                 ret = drm_mode_set_config_internal(mode_set);
 439                 if (ret)
 440                         return ret;
 441         }
 442
 443         return 0;
 444 }
 445
 446 /**
 447  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 448  * @fb_helper: fbcon to restore
 449  *
 450  * This should be called from driver's drm ->lastclose callback
 451  * when implementing an fbcon on top of kms using this helper. This ensures that
 452  * the user isn't greeted with a black screen when e.g. X dies.
 453  *
 454  * RETURNS:
 455  * Zero if everything went ok, negative error code otherwise.
 456  */
 457 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 458 {
 459         struct drm_device *dev = fb_helper->dev;
 460         bool do_delayed;
 461         int ret;
 462
 463         if (!drm_fbdev_emulation)
 464                 return -ENODEV;
 465
 466         drm_modeset_lock_all(dev);
 467         ret = restore_fbdev_mode(fb_helper);
 468
 469         do_delayed = fb_helper->delayed_hotplug;
 470         if (do_delayed)
 471                 fb_helper->delayed_hotplug = false;
 472         drm_modeset_unlock_all(dev);
 473
 474         if (do_delayed)
 475                 drm_fb_helper_hotplug_event(fb_helper);
 476         return ret;
 477 }
 478 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 479
 480 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 481 {
 482         struct drm_device *dev = fb_helper->dev;
 483         struct drm_crtc *crtc;
 484         int bound = 0, crtcs_bound = 0;
 485
 486         /* Sometimes user space wants everything disabled, so don't steal the
 487          * display if there's a master. */
 488         if (dev->primary->master)
 489                 return false;
 490
 491         drm_for_each_crtc(crtc, dev) {
 492                 if (crtc->primary->fb)
 493                         crtcs_bound++;
 494                 if (crtc->primary->fb == fb_helper->fb)
 495                         bound++;
 496         }
 497
 498         if (bound < crtcs_bound)
 499                 return false;
 500
 501         return true;
 502 }
 503
 504 #ifdef CONFIG_MAGIC_SYSRQ
 505 /*
 506  * restore fbcon display for all kms driver's using this helper, used for sysrq
 507  * and panic handling.
 508  */
 509 static bool drm_fb_helper_force_kernel_mode(void)
 510 {
 511         bool ret, error = false;
 512         struct drm_fb_helper *helper;
 513
 514         if (list_empty(&kernel_fb_helper_list))
 515                 return false;
 516
 517         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 518                 struct drm_device *dev = helper->dev;
 519
 520                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 521                         continue;
 522
 523                 drm_modeset_lock_all(dev);
 524                 ret = restore_fbdev_mode(helper);
 525                 if (ret)
 526                         error = true;
 527                 drm_modeset_unlock_all(dev);
 528         }
 529         return error;
 530 }
 531
 532 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 533 {
 534         bool ret;
 535         ret = drm_fb_helper_force_kernel_mode();
 536         if (ret == true)
 537                 DRM_ERROR("Failed to restore crtc configuration\n");
 538 }
 539 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 540
 541 static void drm_fb_helper_sysrq(int dummy1)
 542 {
 543         schedule_work(&drm_fb_helper_restore_work);
 544 }
 545
 546 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 547         .handler = drm_fb_helper_sysrq,
 548         .help_msg = "force-fb(V)",
 549         .action_msg = "Restore framebuffer console",
 550 };
 551 #else
 552 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 553 #endif
 554
 555 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 556 {
 557         struct drm_fb_helper *fb_helper = info->par;
 558         struct drm_device *dev = fb_helper->dev;
 559         struct drm_crtc *crtc;
 560         struct drm_connector *connector;
 561         int i, j;
 562
 563         /*
 564          * For each CRTC in this fb, turn the connectors on/off.
 565          */
 566         drm_modeset_lock_all(dev);
 567         if (!drm_fb_helper_is_bound(fb_helper)) {
 568                 drm_modeset_unlock_all(dev);
 569                 return;
 570         }
 571
 572         for (i = 0; i < fb_helper->crtc_count; i++) {
 573                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 574
 575                 if (!crtc->enabled)
 576                         continue;
 577
 578                 /* Walk the connectors & encoders on this fb turning them on/off */
 579                 for (j = 0; j < fb_helper->connector_count; j++) {
 580                         connector = fb_helper->connector_info[j]->connector;
 581                         connector->funcs->dpms(connector, dpms_mode);
 582                         drm_object_property_set_value(&connector->base,
 583                                 dev->mode_config.dpms_property, dpms_mode);
 584                 }
 585         }
 586         drm_modeset_unlock_all(dev);
 587 }
 588
 589 /**
 590  * drm_fb_helper_blank - implementation for ->fb_blank
 591  * @blank: desired blanking state
 592  * @info: fbdev registered by the helper
 593  */
 594 int drm_fb_helper_blank(int blank, struct fb_info *info)
 595 {
 596         if (oops_in_progress)
 597                 return -EBUSY;
 598
 599         switch (blank) {
 600         /* Display: On; HSync: On, VSync: On */
 601         case FB_BLANK_UNBLANK:
 602                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 603                 break;
 604         /* Display: Off; HSync: On, VSync: On */
 605         case FB_BLANK_NORMAL:
 606                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 607                 break;
 608         /* Display: Off; HSync: Off, VSync: On */
 609         case FB_BLANK_HSYNC_SUSPEND:
 610                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 611                 break;
 612         /* Display: Off; HSync: On, VSync: Off */
 613         case FB_BLANK_VSYNC_SUSPEND:
 614                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 615                 break;
 616         /* Display: Off; HSync: Off, VSync: Off */
 617         case FB_BLANK_POWERDOWN:
 618                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 619                 break;
 620         }
 621         return 0;
 622 }
 623 EXPORT_SYMBOL(drm_fb_helper_blank);
 624
 625 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 626 {
 627         int i;
 628
 629         for (i = 0; i < helper->connector_count; i++)
 630                 kfree(helper->connector_info[i]);
 631         kfree(helper->connector_info);
 632         for (i = 0; i < helper->crtc_count; i++) {
 633                 kfree(helper->crtc_info[i].mode_set.connectors);
 634                 if (helper->crtc_info[i].mode_set.mode)
 635                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 636         }
 637         kfree(helper->crtc_info);
 638 }
 639
 640 /**
 641  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 642  * @dev: DRM device
 643  * @helper: driver-allocated fbdev helper structure to set up
 644  * @funcs: pointer to structure of functions associate with this helper
 645  *
 646  * Sets up the bare minimum to make the framebuffer helper usable. This is
 647  * useful to implement race-free initialization of the polling helpers.
 648  */
 649 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 650                            const struct drm_fb_helper_funcs *funcs)
 651 {
 652         INIT_LIST_HEAD(&helper->kernel_fb_list);
 653         helper->funcs = funcs;
 654         helper->dev = dev;
 655 }
 656 EXPORT_SYMBOL(drm_fb_helper_prepare);
 657
 658 /**
 659  * drm_fb_helper_init - initialize a drm_fb_helper structure
 660  * @dev: drm device
 661  * @fb_helper: driver-allocated fbdev helper structure to initialize
 662  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 663  * @max_conn_count: max connector count
 664  *
 665  * This allocates the structures for the fbdev helper with the given limits.
 666  * Note that this won't yet touch the hardware (through the driver interfaces)
 667  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 668  * to allow driver writes more control over the exact init sequence.
 669  *
 670  * Drivers must call drm_fb_helper_prepare() before calling this function.
 671  *
 672  * RETURNS:
 673  * Zero if everything went ok, nonzero otherwise.
 674  */
 675 int drm_fb_helper_init(struct drm_device *dev,
 676                        struct drm_fb_helper *fb_helper,
 677                        int crtc_count, int max_conn_count)
 678 {
 679         struct drm_crtc *crtc;
 680         int i;
 681
 682         if (!drm_fbdev_emulation)
 683                 return 0;
 684
 685         if (!max_conn_count)
 686                 return -EINVAL;
 687
 688         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 689         if (!fb_helper->crtc_info)
 690                 return -ENOMEM;
 691
 692         fb_helper->crtc_count = crtc_count;
 693         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 694         if (!fb_helper->connector_info) {
 695                 kfree(fb_helper->crtc_info);
 696                 return -ENOMEM;
 697         }
 698         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 699         fb_helper->connector_count = 0;
 700
 701         for (i = 0; i < crtc_count; i++) {
 702                 fb_helper->crtc_info[i].mode_set.connectors =
 703                         kcalloc(max_conn_count,
 704                                 sizeof(struct drm_connector *),
 705                                 GFP_KERNEL);
 706
 707                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 708                         goto out_free;
 709                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 710         }
 711
 712         i = 0;
 713         drm_for_each_crtc(crtc, dev) {
 714                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 715                 i++;
 716         }
 717
 718         fb_helper->atomic = !!drm_core_check_feature(dev, DRIVER_ATOMIC);
 719
 720         return 0;
 721 out_free:
 722         drm_fb_helper_crtc_free(fb_helper);
 723         return -ENOMEM;
 724 }
 725 EXPORT_SYMBOL(drm_fb_helper_init);
 726
 727 /**
 728  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 729  * @fb_helper: driver-allocated fbdev helper
 730  *
 731  * A helper to alloc fb_info and the members cmap and apertures. Called
 732  * by the driver within the fb_probe fb_helper callback function.
 733  *
 734  * RETURNS:
 735  * fb_info pointer if things went okay, pointer containing error code
 736  * otherwise
 737  */
 738 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 739 {
 740         struct device *dev = fb_helper->dev->dev;
 741         struct fb_info *info;
 742         int ret;
 743
 744         info = framebuffer_alloc(0, dev);
 745         if (!info)
 746                 return ERR_PTR(-ENOMEM);
 747
 748         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 749         if (ret)
 750                 goto err_release;
 751
 752         info->apertures = alloc_apertures(1);
 753         if (!info->apertures) {
 754                 ret = -ENOMEM;
 755                 goto err_free_cmap;
 756         }
 757
 758         fb_helper->fbdev = info;
 759
 760         return info;
 761
 762 err_free_cmap:
 763         fb_dealloc_cmap(&info->cmap);
 764 err_release:
 765         framebuffer_release(info);
 766         return ERR_PTR(ret);
 767 }
 768 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 769
 770 /**
 771  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 772  * @fb_helper: driver-allocated fbdev helper
 773  *
 774  * A wrapper around unregister_framebuffer, to release the fb_info
 775  * framebuffer device
 776  */
 777 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 778 {
 779         if (fb_helper && fb_helper->fbdev)
 780                 unregister_framebuffer(fb_helper->fbdev);
 781 }
 782 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 783
 784 /**
 785  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 786  * @fb_helper: driver-allocated fbdev helper
 787  *
 788  * A helper to free memory taken by fb_info and the members cmap and
 789  * apertures
 790  */
 791 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 792 {
 793         if (fb_helper) {
 794                 struct fb_info *info = fb_helper->fbdev;
 795
 796                 if (info) {
 797                         if (info->cmap.len)
 798                                 fb_dealloc_cmap(&info->cmap);
 799                         framebuffer_release(info);
 800                 }
 801
 802                 fb_helper->fbdev = NULL;
 803         }
 804 }
 805 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 806
 807 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 808 {
 809         if (!drm_fbdev_emulation)
 810                 return;
 811
 812         if (!list_empty(&fb_helper->kernel_fb_list)) {
 813                 list_del(&fb_helper->kernel_fb_list);
 814                 if (list_empty(&kernel_fb_helper_list)) {
 815                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 816                 }
 817         }
 818
 819         drm_fb_helper_crtc_free(fb_helper);
 820
 821 }
 822 EXPORT_SYMBOL(drm_fb_helper_fini);
 823
 824 /**
 825  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 826  * @fb_helper: driver-allocated fbdev helper
 827  *
 828  * A wrapper around unlink_framebuffer implemented by fbdev core
 829  */
 830 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 831 {
 832         if (fb_helper && fb_helper->fbdev)
 833                 unlink_framebuffer(fb_helper->fbdev);
 834 }
 835 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 836
 837 /**
 838  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 839  * @info: fb_info struct pointer
 840  * @buf: userspace buffer to read from framebuffer memory
 841  * @count: number of bytes to read from framebuffer memory
 842  * @ppos: read offset within framebuffer memory
 843  *
 844  * A wrapper around fb_sys_read implemented by fbdev core
 845  */
 846 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 847                                size_t count, loff_t *ppos)
 848 {
 849         return fb_sys_read(info, buf, count, ppos);
 850 }
 851 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 852
 853 /**
 854  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 855  * @info: fb_info struct pointer
 856  * @buf: userspace buffer to write to framebuffer memory
 857  * @count: number of bytes to write to framebuffer memory
 858  * @ppos: write offset within framebuffer memory
 859  *
 860  * A wrapper around fb_sys_write implemented by fbdev core
 861  */
 862 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 863                                 size_t count, loff_t *ppos)
 864 {
 865         return fb_sys_write(info, buf, count, ppos);
 866 }
 867 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 868
 869 /**
 870  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 871  * @info: fbdev registered by the helper
 872  * @rect: info about rectangle to fill
 873  *
 874  * A wrapper around sys_fillrect implemented by fbdev core
 875  */
 876 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 877                                 const struct fb_fillrect *rect)
 878 {
 879         sys_fillrect(info, rect);
 880 }
 881 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 882
 883 /**
 884  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 885  * @info: fbdev registered by the helper
 886  * @area: info about area to copy
 887  *
 888  * A wrapper around sys_copyarea implemented by fbdev core
 889  */
 890 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 891                                 const struct fb_copyarea *area)
 892 {
 893         sys_copyarea(info, area);
 894 }
 895 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 896
 897 /**
 898  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 899  * @info: fbdev registered by the helper
 900  * @image: info about image to blit
 901  *
 902  * A wrapper around sys_imageblit implemented by fbdev core
 903  */
 904 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 905                                  const struct fb_image *image)
 906 {
 907         sys_imageblit(info, image);
 908 }
 909 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 910
 911 /**
 912  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 913  * @info: fbdev registered by the helper
 914  * @rect: info about rectangle to fill
 915  *
 916  * A wrapper around cfb_imageblit implemented by fbdev core
 917  */
 918 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 919                                 const struct fb_fillrect *rect)
 920 {
 921         cfb_fillrect(info, rect);
 922 }
 923 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 924
 925 /**
 926  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 927  * @info: fbdev registered by the helper
 928  * @area: info about area to copy
 929  *
 930  * A wrapper around cfb_copyarea implemented by fbdev core
 931  */
 932 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 933                                 const struct fb_copyarea *area)
 934 {
 935         cfb_copyarea(info, area);
 936 }
 937 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
 938
 939 /**
 940  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
 941  * @info: fbdev registered by the helper
 942  * @image: info about image to blit
 943  *
 944  * A wrapper around cfb_imageblit implemented by fbdev core
 945  */
 946 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 947                                  const struct fb_image *image)
 948 {
 949         cfb_imageblit(info, image);
 950 }
 951 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 952
 953 /**
 954  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
 955  * @fb_helper: driver-allocated fbdev helper
 956  * @state: desired state, zero to resume, non-zero to suspend
 957  *
 958  * A wrapper around fb_set_suspend implemented by fbdev core
 959  */
 960 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
 961 {
 962         if (fb_helper && fb_helper->fbdev)
 963                 fb_set_suspend(fb_helper->fbdev, state);
 964 }
 965 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
 966
 967 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 968                      u16 blue, u16 regno, struct fb_info *info)
 969 {
 970         struct drm_fb_helper *fb_helper = info->par;
 971         struct drm_framebuffer *fb = fb_helper->fb;
 972         int pindex;
 973
 974         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 975                 u32 *palette;
 976                 u32 value;
 977                 /* place color in psuedopalette */
 978                 if (regno > 16)
 979                         return -EINVAL;
 980                 palette = (u32 *)info->pseudo_palette;
 981                 red >>= (16 - info->var.red.length);
 982                 green >>= (16 - info->var.green.length);
 983                 blue >>= (16 - info->var.blue.length);
 984                 value = (red << info->var.red.offset) |
 985                         (green << info->var.green.offset) |
 986                         (blue << info->var.blue.offset);
 987                 if (info->var.transp.length > 0) {
 988                         u32 mask = (1 << info->var.transp.length) - 1;
 989                         mask <<= info->var.transp.offset;
 990                         value |= mask;
 991                 }
 992                 palette[regno] = value;
 993                 return 0;
 994         }
 995
 996         /*
 997          * The driver really shouldn't advertise pseudo/directcolor
 998          * visuals if it can't deal with the palette.
 999          */
1000         if (WARN_ON(!fb_helper->funcs->gamma_set ||
1001                     !fb_helper->funcs->gamma_get))
1002                 return -EINVAL;
1003
1004         pindex = regno;
1005
1006         if (fb->bits_per_pixel == 16) {
1007                 pindex = regno << 3;
1008
1009                 if (fb->depth == 16 && regno > 63)
1010                         return -EINVAL;
1011                 if (fb->depth == 15 && regno > 31)
1012                         return -EINVAL;
1013
1014                 if (fb->depth == 16) {
1015                         u16 r, g, b;
1016                         int i;
1017                         if (regno < 32) {
1018                                 for (i = 0; i < 8; i++)
1019                                         fb_helper->funcs->gamma_set(crtc, red,
1020                                                 green, blue, pindex + i);
1021                         }
1022
1023                         fb_helper->funcs->gamma_get(crtc, &r,
1024                                                     &g, &b,
1025                                                     pindex >> 1);
1026
1027                         for (i = 0; i < 4; i++)
1028                                 fb_helper->funcs->gamma_set(crtc, r,
1029                                                             green, b,
1030                                                             (pindex >> 1) + i);
1031                 }
1032         }
1033
1034         if (fb->depth != 16)
1035                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
1036         return 0;
1037 }
1038
1039 /**
1040  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1041  * @cmap: cmap to set
1042  * @info: fbdev registered by the helper
1043  */
1044 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1045 {
1046         struct drm_fb_helper *fb_helper = info->par;
1047         struct drm_device *dev = fb_helper->dev;
1048         const struct drm_crtc_helper_funcs *crtc_funcs;
1049         u16 *red, *green, *blue, *transp;
1050         struct drm_crtc *crtc;
1051         int i, j, rc = 0;
1052         int start;
1053
1054         if (oops_in_progress)
1055                 return -EBUSY;
1056
1057         drm_modeset_lock_all(dev);
1058         if (!drm_fb_helper_is_bound(fb_helper)) {
1059                 drm_modeset_unlock_all(dev);
1060                 return -EBUSY;
1061         }
1062
1063         for (i = 0; i < fb_helper->crtc_count; i++) {
1064                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1065                 crtc_funcs = crtc->helper_private;
1066
1067                 red = cmap->red;
1068                 green = cmap->green;
1069                 blue = cmap->blue;
1070                 transp = cmap->transp;
1071                 start = cmap->start;
1072
1073                 for (j = 0; j < cmap->len; j++) {
1074                         u16 hred, hgreen, hblue, htransp = 0xffff;
1075
1076                         hred = *red++;
1077                         hgreen = *green++;
1078                         hblue = *blue++;
1079
1080                         if (transp)
1081                                 htransp = *transp++;
1082
1083                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1084                         if (rc)
1085                                 goto out;
1086                 }
1087                 if (crtc_funcs->load_lut)
1088                         crtc_funcs->load_lut(crtc);
1089         }
1090  out:
1091         drm_modeset_unlock_all(dev);
1092         return rc;
1093 }
1094 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1095
1096 /**
1097  * drm_fb_helper_check_var - implementation for ->fb_check_var
1098  * @var: screeninfo to check
1099  * @info: fbdev registered by the helper
1100  */
1101 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1102                             struct fb_info *info)
1103 {
1104         struct drm_fb_helper *fb_helper = info->par;
1105         struct drm_framebuffer *fb = fb_helper->fb;
1106         int depth;
1107
1108         if (var->pixclock != 0 || in_dbg_master())
1109                 return -EINVAL;
1110
1111         /* Need to resize the fb object !!! */
1112         if (var->bits_per_pixel > fb->bits_per_pixel ||
1113             var->xres > fb->width || var->yres > fb->height ||
1114             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1115                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1116                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1117                           var->xres, var->yres, var->bits_per_pixel,
1118                           var->xres_virtual, var->yres_virtual,
1119                           fb->width, fb->height, fb->bits_per_pixel);
1120                 return -EINVAL;
1121         }
1122
1123         switch (var->bits_per_pixel) {
1124         case 16:
1125                 depth = (var->green.length == 6) ? 16 : 15;
1126                 break;
1127         case 32:
1128                 depth = (var->transp.length > 0) ? 32 : 24;
1129                 break;
1130         default:
1131                 depth = var->bits_per_pixel;
1132                 break;
1133         }
1134
1135         switch (depth) {
1136         case 8:
1137                 var->red.offset = 0;
1138                 var->green.offset = 0;
1139                 var->blue.offset = 0;
1140                 var->red.length = 8;
1141                 var->green.length = 8;
1142                 var->blue.length = 8;
1143                 var->transp.length = 0;
1144                 var->transp.offset = 0;
1145                 break;
1146         case 15:
1147                 var->red.offset = 10;
1148                 var->green.offset = 5;
1149                 var->blue.offset = 0;
1150                 var->red.length = 5;
1151                 var->green.length = 5;
1152                 var->blue.length = 5;
1153                 var->transp.length = 1;
1154                 var->transp.offset = 15;
1155                 break;
1156         case 16:
1157                 var->red.offset = 11;
1158                 var->green.offset = 5;
1159                 var->blue.offset = 0;
1160                 var->red.length = 5;
1161                 var->green.length = 6;
1162                 var->blue.length = 5;
1163                 var->transp.length = 0;
1164                 var->transp.offset = 0;
1165                 break;
1166         case 24:
1167                 var->red.offset = 16;
1168                 var->green.offset = 8;
1169                 var->blue.offset = 0;
1170                 var->red.length = 8;
1171                 var->green.length = 8;
1172                 var->blue.length = 8;
1173                 var->transp.length = 0;
1174                 var->transp.offset = 0;
1175                 break;
1176         case 32:
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 = 8;
1184                 var->transp.offset = 24;
1185                 break;
1186         default:
1187                 return -EINVAL;
1188         }
1189         return 0;
1190 }
1191 EXPORT_SYMBOL(drm_fb_helper_check_var);
1192
1193 /**
1194  * drm_fb_helper_set_par - implementation for ->fb_set_par
1195  * @info: fbdev registered by the helper
1196  *
1197  * This will let fbcon do the mode init and is called at initialization time by
1198  * the fbdev core when registering the driver, and later on through the hotplug
1199  * callback.
1200  */
1201 int drm_fb_helper_set_par(struct fb_info *info)
1202 {
1203         struct drm_fb_helper *fb_helper = info->par;
1204         struct fb_var_screeninfo *var = &info->var;
1205
1206         if (oops_in_progress)
1207                 return -EBUSY;
1208
1209         if (var->pixclock != 0) {
1210                 DRM_ERROR("PIXEL CLOCK SET\n");
1211                 return -EINVAL;
1212         }
1213
1214         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1215
1216         return 0;
1217 }
1218 EXPORT_SYMBOL(drm_fb_helper_set_par);
1219
1220 static int pan_display_atomic(struct fb_var_screeninfo *var,
1221                               struct fb_info *info)
1222 {
1223         struct drm_fb_helper *fb_helper = info->par;
1224         struct drm_device *dev = fb_helper->dev;
1225         struct drm_atomic_state *state;
1226         struct drm_plane *plane;
1227         int i, ret;
1228         unsigned plane_mask;
1229
1230         state = drm_atomic_state_alloc(dev);
1231         if (!state)
1232                 return -ENOMEM;
1233
1234         state->acquire_ctx = dev->mode_config.acquire_ctx;
1235 retry:
1236         plane_mask = 0;
1237         for(i = 0; i < fb_helper->crtc_count; i++) {
1238                 struct drm_mode_set *mode_set;
1239
1240                 mode_set = &fb_helper->crtc_info[i].mode_set;
1241
1242                 mode_set->x = var->xoffset;
1243                 mode_set->y = var->yoffset;
1244
1245                 ret = __drm_atomic_helper_set_config(mode_set, state);
1246                 if (ret != 0)
1247                         goto fail;
1248
1249                 plane = mode_set->crtc->primary;
1250                 plane_mask |= (1 << drm_plane_index(plane));
1251                 plane->old_fb = plane->fb;
1252         }
1253
1254         ret = drm_atomic_commit(state);
1255         if (ret != 0)
1256                 goto fail;
1257
1258         info->var.xoffset = var->xoffset;
1259         info->var.yoffset = var->yoffset;
1260
1261
1262 fail:
1263         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1264
1265         if (ret == -EDEADLK)
1266                 goto backoff;
1267
1268         if (ret != 0)
1269                 drm_atomic_state_free(state);
1270
1271         return ret;
1272
1273 backoff:
1274         drm_atomic_state_clear(state);
1275         drm_atomic_legacy_backoff(state);
1276
1277         goto retry;
1278 }
1279
1280 /**
1281  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1282  * @var: updated screen information
1283  * @info: fbdev registered by the helper
1284  */
1285 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1286                               struct fb_info *info)
1287 {
1288         struct drm_fb_helper *fb_helper = info->par;
1289         struct drm_device *dev = fb_helper->dev;
1290         struct drm_mode_set *modeset;
1291         int ret = 0;
1292         int i;
1293
1294         if (oops_in_progress)
1295                 return -EBUSY;
1296
1297         drm_modeset_lock_all(dev);
1298         if (!drm_fb_helper_is_bound(fb_helper)) {
1299                 drm_modeset_unlock_all(dev);
1300                 return -EBUSY;
1301         }
1302
1303         if (fb_helper->atomic) {
1304                 ret = pan_display_atomic(var, info);
1305                 goto unlock;
1306         }
1307
1308         for (i = 0; i < fb_helper->crtc_count; i++) {
1309                 modeset = &fb_helper->crtc_info[i].mode_set;
1310
1311                 modeset->x = var->xoffset;
1312                 modeset->y = var->yoffset;
1313
1314                 if (modeset->num_connectors) {
1315                         ret = drm_mode_set_config_internal(modeset);
1316                         if (!ret) {
1317                                 info->var.xoffset = var->xoffset;
1318                                 info->var.yoffset = var->yoffset;
1319                         }
1320                 }
1321         }
1322 unlock:
1323         drm_modeset_unlock_all(dev);
1324         return ret;
1325 }
1326 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1327
1328 /*
1329  * Allocates the backing storage and sets up the fbdev info structure through
1330  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1331  * notifier.
1332  */
1333 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1334                                          int preferred_bpp)
1335 {
1336         int ret = 0;
1337         int crtc_count = 0;
1338         int i;
1339         struct fb_info *info;
1340         struct drm_fb_helper_surface_size sizes;
1341         int gamma_size = 0;
1342
1343         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1344         sizes.surface_depth = 24;
1345         sizes.surface_bpp = 32;
1346         sizes.fb_width = (unsigned)-1;
1347         sizes.fb_height = (unsigned)-1;
1348
1349         /* if driver picks 8 or 16 by default use that
1350            for both depth/bpp */
1351         if (preferred_bpp != sizes.surface_bpp)
1352                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1353
1354         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1355         for (i = 0; i < fb_helper->connector_count; i++) {
1356                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1357                 struct drm_cmdline_mode *cmdline_mode;
1358
1359                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1360
1361                 if (cmdline_mode->bpp_specified) {
1362                         switch (cmdline_mode->bpp) {
1363                         case 8:
1364                                 sizes.surface_depth = sizes.surface_bpp = 8;
1365                                 break;
1366                         case 15:
1367                                 sizes.surface_depth = 15;
1368                                 sizes.surface_bpp = 16;
1369                                 break;
1370                         case 16:
1371                                 sizes.surface_depth = sizes.surface_bpp = 16;
1372                                 break;
1373                         case 24:
1374                                 sizes.surface_depth = sizes.surface_bpp = 24;
1375                                 break;
1376                         case 32:
1377                                 sizes.surface_depth = 24;
1378                                 sizes.surface_bpp = 32;
1379                                 break;
1380                         }
1381                         break;
1382                 }
1383         }
1384
1385         crtc_count = 0;
1386         for (i = 0; i < fb_helper->crtc_count; i++) {
1387                 struct drm_display_mode *desired_mode;
1388                 struct drm_mode_set *mode_set;
1389                 int x, y, j;
1390                 /* in case of tile group, are we the last tile vert or horiz?
1391                  * If no tile group you are always the last one both vertically
1392                  * and horizontally
1393                  */
1394                 bool lastv = true, lasth = true;
1395
1396                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1397                 mode_set = &fb_helper->crtc_info[i].mode_set;
1398
1399                 if (!desired_mode)
1400                         continue;
1401
1402                 crtc_count++;
1403
1404                 x = fb_helper->crtc_info[i].x;
1405                 y = fb_helper->crtc_info[i].y;
1406
1407                 if (gamma_size == 0)
1408                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1409
1410                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1411                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1412
1413                 for (j = 0; j < mode_set->num_connectors; j++) {
1414                         struct drm_connector *connector = mode_set->connectors[j];
1415                         if (connector->has_tile) {
1416                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1417                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1418                                 /* cloning to multiple tiles is just crazy-talk, so: */
1419                                 break;
1420                         }
1421                 }
1422
1423                 if (lasth)
1424                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1425                 if (lastv)
1426                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1427         }
1428
1429         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1430                 /* hmm everyone went away - assume VGA cable just fell out
1431                    and will come back later. */
1432                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1433                 sizes.fb_width = sizes.surface_width = 1024;
1434                 sizes.fb_height = sizes.surface_height = 768;
1435         }
1436
1437         /* push down into drivers */
1438         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1439         if (ret < 0)
1440                 return ret;
1441
1442         info = fb_helper->fbdev;
1443
1444         /*
1445          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1446          * events, but at init time drm_setup_crtcs needs to be called before
1447          * the fb is allocated (since we need to figure out the desired size of
1448          * the fb before we can allocate it ...). Hence we need to fix things up
1449          * here again.
1450          */
1451         for (i = 0; i < fb_helper->crtc_count; i++)
1452                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1453                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1454
1455
1456         info->var.pixclock = 0;
1457         if (register_framebuffer(info) < 0)
1458                 return -EINVAL;
1459
1460         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1461                         info->node, info->fix.id);
1462
1463         if (list_empty(&kernel_fb_helper_list)) {
1464                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1465         }
1466
1467         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1468
1469         return 0;
1470 }
1471
1472 /**
1473  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1474  * @info: fbdev registered by the helper
1475  * @pitch: desired pitch
1476  * @depth: desired depth
1477  *
1478  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1479  * fbdev emulations. Drivers which support acceleration methods which impose
1480  * additional constraints need to set up their own limits.
1481  *
1482  * Drivers should call this (or their equivalent setup code) from their
1483  * ->fb_probe callback.
1484  */
1485 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1486                             uint32_t depth)
1487 {
1488         info->fix.type = FB_TYPE_PACKED_PIXELS;
1489         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1490                 FB_VISUAL_TRUECOLOR;
1491         info->fix.mmio_start = 0;
1492         info->fix.mmio_len = 0;
1493         info->fix.type_aux = 0;
1494         info->fix.xpanstep = 1; /* doing it in hw */
1495         info->fix.ypanstep = 1; /* doing it in hw */
1496         info->fix.ywrapstep = 0;
1497         info->fix.accel = FB_ACCEL_NONE;
1498
1499         info->fix.line_length = pitch;
1500         return;
1501 }
1502 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1503
1504 /**
1505  * drm_fb_helper_fill_var - initalizes variable fbdev information
1506  * @info: fbdev instance to set up
1507  * @fb_helper: fb helper instance to use as template
1508  * @fb_width: desired fb width
1509  * @fb_height: desired fb height
1510  *
1511  * Sets up the variable fbdev metainformation from the given fb helper instance
1512  * and the drm framebuffer allocated in fb_helper->fb.
1513  *
1514  * Drivers should call this (or their equivalent setup code) from their
1515  * ->fb_probe callback after having allocated the fbdev backing
1516  * storage framebuffer.
1517  */
1518 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1519                             uint32_t fb_width, uint32_t fb_height)
1520 {
1521         struct drm_framebuffer *fb = fb_helper->fb;
1522         info->pseudo_palette = fb_helper->pseudo_palette;
1523         info->var.xres_virtual = fb->width;
1524         info->var.yres_virtual = fb->height;
1525         info->var.bits_per_pixel = fb->bits_per_pixel;
1526         info->var.accel_flags = FB_ACCELF_TEXT;
1527         info->var.xoffset = 0;
1528         info->var.yoffset = 0;
1529         info->var.activate = FB_ACTIVATE_NOW;
1530         info->var.height = -1;
1531         info->var.width = -1;
1532
1533         switch (fb->depth) {
1534         case 8:
1535                 info->var.red.offset = 0;
1536                 info->var.green.offset = 0;
1537                 info->var.blue.offset = 0;
1538                 info->var.red.length = 8; /* 8bit DAC */
1539                 info->var.green.length = 8;
1540                 info->var.blue.length = 8;
1541                 info->var.transp.offset = 0;
1542                 info->var.transp.length = 0;
1543                 break;
1544         case 15:
1545                 info->var.red.offset = 10;
1546                 info->var.green.offset = 5;
1547                 info->var.blue.offset = 0;
1548                 info->var.red.length = 5;
1549                 info->var.green.length = 5;
1550                 info->var.blue.length = 5;
1551                 info->var.transp.offset = 15;
1552                 info->var.transp.length = 1;
1553                 break;
1554         case 16:
1555                 info->var.red.offset = 11;
1556                 info->var.green.offset = 5;
1557                 info->var.blue.offset = 0;
1558                 info->var.red.length = 5;
1559                 info->var.green.length = 6;
1560                 info->var.blue.length = 5;
1561                 info->var.transp.offset = 0;
1562                 break;
1563         case 24:
1564                 info->var.red.offset = 16;
1565                 info->var.green.offset = 8;
1566                 info->var.blue.offset = 0;
1567                 info->var.red.length = 8;
1568                 info->var.green.length = 8;
1569                 info->var.blue.length = 8;
1570                 info->var.transp.offset = 0;
1571                 info->var.transp.length = 0;
1572                 break;
1573         case 32:
1574                 info->var.red.offset = 16;
1575                 info->var.green.offset = 8;
1576                 info->var.blue.offset = 0;
1577                 info->var.red.length = 8;
1578                 info->var.green.length = 8;
1579                 info->var.blue.length = 8;
1580                 info->var.transp.offset = 24;
1581                 info->var.transp.length = 8;
1582                 break;
1583         default:
1584                 break;
1585         }
1586
1587         info->var.xres = fb_width;
1588         info->var.yres = fb_height;
1589 }
1590 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1591
1592 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1593                                                uint32_t maxX,
1594                                                uint32_t maxY)
1595 {
1596         struct drm_connector *connector;
1597         int count = 0;
1598         int i;
1599
1600         for (i = 0; i < fb_helper->connector_count; i++) {
1601                 connector = fb_helper->connector_info[i]->connector;
1602                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1603         }
1604
1605         return count;
1606 }
1607
1608 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1609 {
1610         struct drm_display_mode *mode;
1611
1612         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1613                 if (mode->hdisplay > width ||
1614                     mode->vdisplay > height)
1615                         continue;
1616                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1617                         return mode;
1618         }
1619         return NULL;
1620 }
1621 EXPORT_SYMBOL(drm_has_preferred_mode);
1622
1623 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1624 {
1625         return fb_connector->connector->cmdline_mode.specified;
1626 }
1627
1628 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1629                                                       int width, int height)
1630 {
1631         struct drm_cmdline_mode *cmdline_mode;
1632         struct drm_display_mode *mode;
1633         bool prefer_non_interlace;
1634
1635         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1636         if (cmdline_mode->specified == false)
1637                 return NULL;
1638
1639         /* attempt to find a matching mode in the list of modes
1640          *  we have gotten so far, if not add a CVT mode that conforms
1641          */
1642         if (cmdline_mode->rb || cmdline_mode->margins)
1643                 goto create_mode;
1644
1645         prefer_non_interlace = !cmdline_mode->interlace;
1646 again:
1647         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1648                 /* check width/height */
1649                 if (mode->hdisplay != cmdline_mode->xres ||
1650                     mode->vdisplay != cmdline_mode->yres)
1651                         continue;
1652
1653                 if (cmdline_mode->refresh_specified) {
1654                         if (mode->vrefresh != cmdline_mode->refresh)
1655                                 continue;
1656                 }
1657
1658                 if (cmdline_mode->interlace) {
1659                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1660                                 continue;
1661                 } else if (prefer_non_interlace) {
1662                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1663                                 continue;
1664                 }
1665                 return mode;
1666         }
1667
1668         if (prefer_non_interlace) {
1669                 prefer_non_interlace = false;
1670                 goto again;
1671         }
1672
1673 create_mode:
1674         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1675                                                  cmdline_mode);
1676         list_add(&mode->head, &fb_helper_conn->connector->modes);
1677         return mode;
1678 }
1679 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1680
1681 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1682 {
1683         bool enable;
1684
1685         if (strict)
1686                 enable = connector->status == connector_status_connected;
1687         else
1688                 enable = connector->status != connector_status_disconnected;
1689
1690         return enable;
1691 }
1692
1693 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1694                                   bool *enabled)
1695 {
1696         bool any_enabled = false;
1697         struct drm_connector *connector;
1698         int i = 0;
1699
1700         for (i = 0; i < fb_helper->connector_count; i++) {
1701                 connector = fb_helper->connector_info[i]->connector;
1702                 enabled[i] = drm_connector_enabled(connector, true);
1703                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1704                           enabled[i] ? "yes" : "no");
1705                 any_enabled |= enabled[i];
1706         }
1707
1708         if (any_enabled)
1709                 return;
1710
1711         for (i = 0; i < fb_helper->connector_count; i++) {
1712                 connector = fb_helper->connector_info[i]->connector;
1713                 enabled[i] = drm_connector_enabled(connector, false);
1714         }
1715 }
1716
1717 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1718                               struct drm_display_mode **modes,
1719                               struct drm_fb_offset *offsets,
1720                               bool *enabled, int width, int height)
1721 {
1722         int count, i, j;
1723         bool can_clone = false;
1724         struct drm_fb_helper_connector *fb_helper_conn;
1725         struct drm_display_mode *dmt_mode, *mode;
1726
1727         /* only contemplate cloning in the single crtc case */
1728         if (fb_helper->crtc_count > 1)
1729                 return false;
1730
1731         count = 0;
1732         for (i = 0; i < fb_helper->connector_count; i++) {
1733                 if (enabled[i])
1734                         count++;
1735         }
1736
1737         /* only contemplate cloning if more than one connector is enabled */
1738         if (count <= 1)
1739                 return false;
1740
1741         /* check the command line or if nothing common pick 1024x768 */
1742         can_clone = true;
1743         for (i = 0; i < fb_helper->connector_count; i++) {
1744                 if (!enabled[i])
1745                         continue;
1746                 fb_helper_conn = fb_helper->connector_info[i];
1747                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1748                 if (!modes[i]) {
1749                         can_clone = false;
1750                         break;
1751                 }
1752                 for (j = 0; j < i; j++) {
1753                         if (!enabled[j])
1754                                 continue;
1755                         if (!drm_mode_equal(modes[j], modes[i]))
1756                                 can_clone = false;
1757                 }
1758         }
1759
1760         if (can_clone) {
1761                 DRM_DEBUG_KMS("can clone using command line\n");
1762                 return true;
1763         }
1764
1765         /* try and find a 1024x768 mode on each connector */
1766         can_clone = true;
1767         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1768
1769         for (i = 0; i < fb_helper->connector_count; i++) {
1770
1771                 if (!enabled[i])
1772                         continue;
1773
1774                 fb_helper_conn = fb_helper->connector_info[i];
1775                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1776                         if (drm_mode_equal(mode, dmt_mode))
1777                                 modes[i] = mode;
1778                 }
1779                 if (!modes[i])
1780                         can_clone = false;
1781         }
1782
1783         if (can_clone) {
1784                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1785                 return true;
1786         }
1787         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1788         return false;
1789 }
1790
1791 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1792                                 struct drm_display_mode **modes,
1793                                 struct drm_fb_offset *offsets,
1794                                 int idx,
1795                                 int h_idx, int v_idx)
1796 {
1797         struct drm_fb_helper_connector *fb_helper_conn;
1798         int i;
1799         int hoffset = 0, voffset = 0;
1800
1801         for (i = 0; i < fb_helper->connector_count; i++) {
1802                 fb_helper_conn = fb_helper->connector_info[i];
1803                 if (!fb_helper_conn->connector->has_tile)
1804                         continue;
1805
1806                 if (!modes[i] && (h_idx || v_idx)) {
1807                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1808                                       fb_helper_conn->connector->base.id);
1809                         continue;
1810                 }
1811                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1812                         hoffset += modes[i]->hdisplay;
1813
1814                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1815                         voffset += modes[i]->vdisplay;
1816         }
1817         offsets[idx].x = hoffset;
1818         offsets[idx].y = voffset;
1819         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1820         return 0;
1821 }
1822
1823 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1824                                  struct drm_display_mode **modes,
1825                                  struct drm_fb_offset *offsets,
1826                                  bool *enabled, int width, int height)
1827 {
1828         struct drm_fb_helper_connector *fb_helper_conn;
1829         int i;
1830         uint64_t conn_configured = 0, mask;
1831         int tile_pass = 0;
1832         mask = (1 << fb_helper->connector_count) - 1;
1833 retry:
1834         for (i = 0; i < fb_helper->connector_count; i++) {
1835                 fb_helper_conn = fb_helper->connector_info[i];
1836
1837                 if (conn_configured & (1 << i))
1838                         continue;
1839
1840                 if (enabled[i] == false) {
1841                         conn_configured |= (1 << i);
1842                         continue;
1843                 }
1844
1845                 /* first pass over all the untiled connectors */
1846                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1847                         continue;
1848
1849                 if (tile_pass == 1) {
1850                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1851                             fb_helper_conn->connector->tile_v_loc != 0)
1852                                 continue;
1853
1854                 } else {
1855                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1856                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1857                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1858                                 continue;
1859
1860                         /* find the tile offsets for this pass - need
1861                            to find all tiles left and above */
1862                         drm_get_tile_offsets(fb_helper, modes, offsets,
1863                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1864                 }
1865                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1866                               fb_helper_conn->connector->base.id);
1867
1868                 /* got for command line mode first */
1869                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1870                 if (!modes[i]) {
1871                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1872                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1873                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1874                 }
1875                 /* No preferred modes, pick one off the list */
1876                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1877                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1878                                 break;
1879                 }
1880                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1881                           "none");
1882                 conn_configured |= (1 << i);
1883         }
1884
1885         if ((conn_configured & mask) != mask) {
1886                 tile_pass++;
1887                 goto retry;
1888         }
1889         return true;
1890 }
1891
1892 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1893                           struct drm_fb_helper_crtc **best_crtcs,
1894                           struct drm_display_mode **modes,
1895                           int n, int width, int height)
1896 {
1897         int c, o;
1898         struct drm_device *dev = fb_helper->dev;
1899         struct drm_connector *connector;
1900         const struct drm_connector_helper_funcs *connector_funcs;
1901         struct drm_encoder *encoder;
1902         int my_score, best_score, score;
1903         struct drm_fb_helper_crtc **crtcs, *crtc;
1904         struct drm_fb_helper_connector *fb_helper_conn;
1905
1906         if (n == fb_helper->connector_count)
1907                 return 0;
1908
1909         fb_helper_conn = fb_helper->connector_info[n];
1910         connector = fb_helper_conn->connector;
1911
1912         best_crtcs[n] = NULL;
1913         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1914         if (modes[n] == NULL)
1915                 return best_score;
1916
1917         crtcs = kzalloc(dev->mode_config.num_connector *
1918                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1919         if (!crtcs)
1920                 return best_score;
1921
1922         my_score = 1;
1923         if (connector->status == connector_status_connected)
1924                 my_score++;
1925         if (drm_has_cmdline_mode(fb_helper_conn))
1926                 my_score++;
1927         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1928                 my_score++;
1929
1930         connector_funcs = connector->helper_private;
1931         encoder = connector_funcs->best_encoder(connector);
1932         if (!encoder)
1933                 goto out;
1934
1935         /* select a crtc for this connector and then attempt to configure
1936            remaining connectors */
1937         for (c = 0; c < fb_helper->crtc_count; c++) {
1938                 crtc = &fb_helper->crtc_info[c];
1939
1940                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1941                         continue;
1942
1943                 for (o = 0; o < n; o++)
1944                         if (best_crtcs[o] == crtc)
1945                                 break;
1946
1947                 if (o < n) {
1948                         /* ignore cloning unless only a single crtc */
1949                         if (fb_helper->crtc_count > 1)
1950                                 continue;
1951
1952                         if (!drm_mode_equal(modes[o], modes[n]))
1953                                 continue;
1954                 }
1955
1956                 crtcs[n] = crtc;
1957                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1958                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1959                                                   width, height);
1960                 if (score > best_score) {
1961                         best_score = score;
1962                         memcpy(best_crtcs, crtcs,
1963                                dev->mode_config.num_connector *
1964                                sizeof(struct drm_fb_helper_crtc *));
1965                 }
1966         }
1967 out:
1968         kfree(crtcs);
1969         return best_score;
1970 }
1971
1972 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1973 {
1974         struct drm_device *dev = fb_helper->dev;
1975         struct drm_fb_helper_crtc **crtcs;
1976         struct drm_display_mode **modes;
1977         struct drm_fb_offset *offsets;
1978         struct drm_mode_set *modeset;
1979         bool *enabled;
1980         int width, height;
1981         int i;
1982
1983         DRM_DEBUG_KMS("\n");
1984
1985         width = dev->mode_config.max_width;
1986         height = dev->mode_config.max_height;
1987
1988         crtcs = kcalloc(fb_helper->connector_count,
1989                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1990         modes = kcalloc(fb_helper->connector_count,
1991                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1992         offsets = kcalloc(fb_helper->connector_count,
1993                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1994         enabled = kcalloc(fb_helper->connector_count,
1995                           sizeof(bool), GFP_KERNEL);
1996         if (!crtcs || !modes || !enabled || !offsets) {
1997                 DRM_ERROR("Memory allocation failed\n");
1998                 goto out;
1999         }
2000
2001
2002         drm_enable_connectors(fb_helper, enabled);
2003
2004         if (!(fb_helper->funcs->initial_config &&
2005               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2006                                                offsets,
2007                                                enabled, width, height))) {
2008                 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2009                 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2010                 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2011
2012                 if (!drm_target_cloned(fb_helper, modes, offsets,
2013                                        enabled, width, height) &&
2014                     !drm_target_preferred(fb_helper, modes, offsets,
2015                                           enabled, width, height))
2016                         DRM_ERROR("Unable to find initial modes\n");
2017
2018                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2019                               width, height);
2020
2021                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2022         }
2023
2024         /* need to set the modesets up here for use later */
2025         /* fill out the connector<->crtc mappings into the modesets */
2026         for (i = 0; i < fb_helper->crtc_count; i++) {
2027                 modeset = &fb_helper->crtc_info[i].mode_set;
2028                 modeset->num_connectors = 0;
2029                 modeset->fb = NULL;
2030         }
2031
2032         for (i = 0; i < fb_helper->connector_count; i++) {
2033                 struct drm_display_mode *mode = modes[i];
2034                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2035                 struct drm_fb_offset *offset = &offsets[i];
2036                 modeset = &fb_crtc->mode_set;
2037
2038                 if (mode && fb_crtc) {
2039                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2040                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2041                         fb_crtc->desired_mode = mode;
2042                         fb_crtc->x = offset->x;
2043                         fb_crtc->y = offset->y;
2044                         if (modeset->mode)
2045                                 drm_mode_destroy(dev, modeset->mode);
2046                         modeset->mode = drm_mode_duplicate(dev,
2047                                                            fb_crtc->desired_mode);
2048                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
2049                         modeset->fb = fb_helper->fb;
2050                         modeset->x = offset->x;
2051                         modeset->y = offset->y;
2052                 }
2053         }
2054
2055         /* Clear out any old modes if there are no more connected outputs. */
2056         for (i = 0; i < fb_helper->crtc_count; i++) {
2057                 modeset = &fb_helper->crtc_info[i].mode_set;
2058                 if (modeset->num_connectors == 0) {
2059                         BUG_ON(modeset->fb);
2060                         if (modeset->mode)
2061                                 drm_mode_destroy(dev, modeset->mode);
2062                         modeset->mode = NULL;
2063                 }
2064         }
2065 out:
2066         kfree(crtcs);
2067         kfree(modes);
2068         kfree(offsets);
2069         kfree(enabled);
2070 }
2071
2072 /**
2073  * drm_fb_helper_initial_config - setup a sane initial connector configuration
2074  * @fb_helper: fb_helper device struct
2075  * @bpp_sel: bpp value to use for the framebuffer configuration
2076  *
2077  * Scans the CRTCs and connectors and tries to put together an initial setup.
2078  * At the moment, this is a cloned configuration across all heads with
2079  * a new framebuffer object as the backing store.
2080  *
2081  * Note that this also registers the fbdev and so allows userspace to call into
2082  * the driver through the fbdev interfaces.
2083  *
2084  * This function will call down into the ->fb_probe callback to let
2085  * the driver allocate and initialize the fbdev info structure and the drm
2086  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2087  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2088  * values for the fbdev info structure.
2089  *
2090  * HANG DEBUGGING:
2091  *
2092  * When you have fbcon support built-in or already loaded, this function will do
2093  * a full modeset to setup the fbdev console. Due to locking misdesign in the
2094  * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2095  * console_lock. Until console_unlock is called no dmesg lines will be sent out
2096  * to consoles, not even serial console. This means when your driver crashes,
2097  * you will see absolutely nothing else but a system stuck in this function,
2098  * with no further output. Any kind of printk() you place within your own driver
2099  * or in the drm core modeset code will also never show up.
2100  *
2101  * Standard debug practice is to run the fbcon setup without taking the
2102  * console_lock as a hack, to be able to see backtraces and crashes on the
2103  * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2104  * cmdline option.
2105  *
2106  * The other option is to just disable fbdev emulation since very likely the
2107  * first modest from userspace will crash in the same way, and is even easier to
2108  * debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2109  * kernel cmdline option.
2110  *
2111  * RETURNS:
2112  * Zero if everything went ok, nonzero otherwise.
2113  */
2114 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2115 {
2116         struct drm_device *dev = fb_helper->dev;
2117         int count = 0;
2118
2119         if (!drm_fbdev_emulation)
2120                 return 0;
2121
2122         mutex_lock(&dev->mode_config.mutex);
2123         count = drm_fb_helper_probe_connector_modes(fb_helper,
2124                                                     dev->mode_config.max_width,
2125                                                     dev->mode_config.max_height);
2126         mutex_unlock(&dev->mode_config.mutex);
2127         /*
2128          * we shouldn't end up with no modes here.
2129          */
2130         if (count == 0)
2131                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2132
2133         drm_setup_crtcs(fb_helper);
2134
2135         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2136 }
2137 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2138
2139 /**
2140  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2141  *                               probing all the outputs attached to the fb
2142  * @fb_helper: the drm_fb_helper
2143  *
2144  * Scan the connectors attached to the fb_helper and try to put together a
2145  * setup after *notification of a change in output configuration.
2146  *
2147  * Called at runtime, takes the mode config locks to be able to check/change the
2148  * modeset configuration. Must be run from process context (which usually means
2149  * either the output polling work or a work item launched from the driver's
2150  * hotplug interrupt).
2151  *
2152  * Note that drivers may call this even before calling
2153  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
2154  * for a race-free fbcon setup and will make sure that the fbdev emulation will
2155  * not miss any hotplug events.
2156  *
2157  * RETURNS:
2158  * 0 on success and a non-zero error code otherwise.
2159  */
2160 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2161 {
2162         struct drm_device *dev = fb_helper->dev;
2163         u32 max_width, max_height;
2164
2165         if (!drm_fbdev_emulation)
2166                 return 0;
2167
2168         mutex_lock(&fb_helper->dev->mode_config.mutex);
2169         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2170                 fb_helper->delayed_hotplug = true;
2171                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2172                 return 0;
2173         }
2174         DRM_DEBUG_KMS("\n");
2175
2176         max_width = fb_helper->fb->width;
2177         max_height = fb_helper->fb->height;
2178
2179         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2180         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2181
2182         drm_modeset_lock_all(dev);
2183         drm_setup_crtcs(fb_helper);
2184         drm_modeset_unlock_all(dev);
2185         drm_fb_helper_set_par(fb_helper->fbdev);
2186
2187         return 0;
2188 }
2189 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2190
2191 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2192  * but the module doesn't depend on any fb console symbols.  At least
2193  * attempt to load fbcon to avoid leaving the system without a usable console.
2194  */
2195 int __init drm_fb_helper_modinit(void)
2196 {
2197 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2198         const char *name = "fbcon";
2199         struct module *fbcon;
2200
2201         mutex_lock(&module_mutex);
2202         fbcon = find_module(name);
2203         mutex_unlock(&module_mutex);
2204
2205         if (!fbcon)
2206                 request_module_nowait(name);
2207 #endif
2208         return 0;
2209 }
2210 EXPORT_SYMBOL(drm_fb_helper_modinit);