drivers/gpu/drm/drm_crtc.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  * Copyright (c) 2008 Red Hat Inc.
   5  *
   6  * DRM core CRTC related 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  *      Keith Packard
  28  *      Eric Anholt <eric@anholt.net>
  29  *      Dave Airlie <airlied@linux.ie>
  30  *      Jesse Barnes <jesse.barnes@intel.com>
  31  */
  32 #include <linux/ctype.h>
  33 #include <linux/list.h>
  34 #include <linux/slab.h>
  35 #include <linux/export.h>
  36 #include <linux/dma-fence.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_edid.h>
  40 #include <drm/drm_fourcc.h>
  41 #include <drm/drm_modeset_lock.h>
  42 #include <drm/drm_atomic.h>
  43 #include <drm/drm_auth.h>
  44 #include <drm/drm_debugfs_crc.h>
  45
  46 #include "drm_crtc_internal.h"
  47 #include "drm_internal.h"
  48
  49 /**
  50  * DOC: overview
  51  *
  52  * A CRTC represents the overall display pipeline. It receives pixel data from
  53  * &drm_plane and blends them together. The &drm_display_mode is also attached
  54  * to the CRTC, specifying display timings. On the output side the data is fed
  55  * to one or more &drm_encoder, which are then each connected to one
  56  * &drm_connector.
  57  *
  58  * To create a CRTC, a KMS drivers allocates and zeroes an instances of
  59  * &struct drm_crtc (possibly as part of a larger structure) and registers it
  60  * with a call to drm_crtc_init_with_planes().
  61  *
  62  * The CRTC is also the entry point for legacy modeset operations, see
  63  * &drm_crtc_funcs.set_config, legacy plane operations, see
  64  * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2, and other legacy
  65  * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these
  66  * features are controlled through &drm_property and
  67  * &drm_mode_config_funcs.atomic_check and &drm_mode_config_funcs.atomic_check.
  68  */
  69
  70 /**
  71  * drm_crtc_from_index - find the registered CRTC at an index
  72  * @dev: DRM device
  73  * @idx: index of registered CRTC to find for
  74  *
  75  * Given a CRTC index, return the registered CRTC from DRM device's
  76  * list of CRTCs with matching index. This is the inverse of drm_crtc_index().
  77  * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
  78  * &drm_driver.disable_vblank), since that still deals with indices instead
  79  * of pointers to &struct drm_crtc."
  80  */
  81 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
  82 {
  83         struct drm_crtc *crtc;
  84
  85         drm_for_each_crtc(crtc, dev)
  86                 if (idx == crtc->index)
  87                         return crtc;
  88
  89         return NULL;
  90 }
  91 EXPORT_SYMBOL(drm_crtc_from_index);
  92
  93 /**
  94  * drm_crtc_force_disable - Forcibly turn off a CRTC
  95  * @crtc: CRTC to turn off
  96  *
  97  * Note: This should only be used by non-atomic legacy drivers.
  98  *
  99  * Returns:
 100  * Zero on success, error code on failure.
 101  */
 102 int drm_crtc_force_disable(struct drm_crtc *crtc)
 103 {
 104         struct drm_mode_set set = {
 105                 .crtc = crtc,
 106         };
 107
 108         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 109
 110         return drm_mode_set_config_internal(&set);
 111 }
 112 EXPORT_SYMBOL(drm_crtc_force_disable);
 113
 114 /**
 115  * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
 116  * @dev: DRM device whose CRTCs to turn off
 117  *
 118  * Drivers may want to call this on unload to ensure that all displays are
 119  * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
 120  *
 121  * Note: This should only be used by non-atomic legacy drivers. For an atomic
 122  * version look at drm_atomic_helper_shutdown().
 123  *
 124  * Returns:
 125  * Zero on success, error code on failure.
 126  */
 127 int drm_crtc_force_disable_all(struct drm_device *dev)
 128 {
 129         struct drm_crtc *crtc;
 130         int ret = 0;
 131
 132         drm_modeset_lock_all(dev);
 133         drm_for_each_crtc(crtc, dev)
 134                 if (crtc->enabled) {
 135                         ret = drm_crtc_force_disable(crtc);
 136                         if (ret)
 137                                 goto out;
 138                 }
 139 out:
 140         drm_modeset_unlock_all(dev);
 141         return ret;
 142 }
 143 EXPORT_SYMBOL(drm_crtc_force_disable_all);
 144
 145 static unsigned int drm_num_crtcs(struct drm_device *dev)
 146 {
 147         unsigned int num = 0;
 148         struct drm_crtc *tmp;
 149
 150         drm_for_each_crtc(tmp, dev) {
 151                 num++;
 152         }
 153
 154         return num;
 155 }
 156
 157 int drm_crtc_register_all(struct drm_device *dev)
 158 {
 159         struct drm_crtc *crtc;
 160         int ret = 0;
 161
 162         drm_for_each_crtc(crtc, dev) {
 163                 if (drm_debugfs_crtc_add(crtc))
 164                         DRM_ERROR("Failed to initialize debugfs entry for CRTC '%s'.\n",
 165                                   crtc->name);
 166
 167                 if (crtc->funcs->late_register)
 168                         ret = crtc->funcs->late_register(crtc);
 169                 if (ret)
 170                         return ret;
 171         }
 172
 173         return 0;
 174 }
 175
 176 void drm_crtc_unregister_all(struct drm_device *dev)
 177 {
 178         struct drm_crtc *crtc;
 179
 180         drm_for_each_crtc(crtc, dev) {
 181                 if (crtc->funcs->early_unregister)
 182                         crtc->funcs->early_unregister(crtc);
 183                 drm_debugfs_crtc_remove(crtc);
 184         }
 185 }
 186
 187 static int drm_crtc_crc_init(struct drm_crtc *crtc)
 188 {
 189 #ifdef CONFIG_DEBUG_FS
 190         spin_lock_init(&crtc->crc.lock);
 191         init_waitqueue_head(&crtc->crc.wq);
 192         crtc->crc.source = kstrdup("auto", GFP_KERNEL);
 193         if (!crtc->crc.source)
 194                 return -ENOMEM;
 195 #endif
 196         return 0;
 197 }
 198
 199 static void drm_crtc_crc_fini(struct drm_crtc *crtc)
 200 {
 201 #ifdef CONFIG_DEBUG_FS
 202         kfree(crtc->crc.source);
 203 #endif
 204 }
 205
 206 static const struct dma_fence_ops drm_crtc_fence_ops;
 207
 208 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
 209 {
 210         BUG_ON(fence->ops != &drm_crtc_fence_ops);
 211         return container_of(fence->lock, struct drm_crtc, fence_lock);
 212 }
 213
 214 static const char *drm_crtc_fence_get_driver_name(struct dma_fence *fence)
 215 {
 216         struct drm_crtc *crtc = fence_to_crtc(fence);
 217
 218         return crtc->dev->driver->name;
 219 }
 220
 221 static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
 222 {
 223         struct drm_crtc *crtc = fence_to_crtc(fence);
 224
 225         return crtc->timeline_name;
 226 }
 227
 228 static bool drm_crtc_fence_enable_signaling(struct dma_fence *fence)
 229 {
 230         return true;
 231 }
 232
 233 static const struct dma_fence_ops drm_crtc_fence_ops = {
 234         .get_driver_name = drm_crtc_fence_get_driver_name,
 235         .get_timeline_name = drm_crtc_fence_get_timeline_name,
 236         .enable_signaling = drm_crtc_fence_enable_signaling,
 237         .wait = dma_fence_default_wait,
 238 };
 239
 240 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
 241 {
 242         struct dma_fence *fence;
 243
 244         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 245         if (!fence)
 246                 return NULL;
 247
 248         dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
 249                        crtc->fence_context, ++crtc->fence_seqno);
 250
 251         return fence;
 252 }
 253
 254 /**
 255  * drm_crtc_init_with_planes - Initialise a new CRTC object with
 256  *    specified primary and cursor planes.
 257  * @dev: DRM device
 258  * @crtc: CRTC object to init
 259  * @primary: Primary plane for CRTC
 260  * @cursor: Cursor plane for CRTC
 261  * @funcs: callbacks for the new CRTC
 262  * @name: printf style format string for the CRTC name, or NULL for default name
 263  *
 264  * Inits a new object created as base part of a driver crtc object. Drivers
 265  * should use this function instead of drm_crtc_init(), which is only provided
 266  * for backwards compatibility with drivers which do not yet support universal
 267  * planes). For really simple hardware which has only 1 plane look at
 268  * drm_simple_display_pipe_init() instead.
 269  *
 270  * Returns:
 271  * Zero on success, error code on failure.
 272  */
 273 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 274                               struct drm_plane *primary,
 275                               struct drm_plane *cursor,
 276                               const struct drm_crtc_funcs *funcs,
 277                               const char *name, ...)
 278 {
 279         struct drm_mode_config *config = &dev->mode_config;
 280         int ret;
 281
 282         WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
 283         WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
 284
 285         crtc->dev = dev;
 286         crtc->funcs = funcs;
 287
 288         INIT_LIST_HEAD(&crtc->commit_list);
 289         spin_lock_init(&crtc->commit_lock);
 290
 291         drm_modeset_lock_init(&crtc->mutex);
 292         ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
 293         if (ret)
 294                 return ret;
 295
 296         if (name) {
 297                 va_list ap;
 298
 299                 va_start(ap, name);
 300                 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
 301                 va_end(ap);
 302         } else {
 303                 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
 304                                        drm_num_crtcs(dev));
 305         }
 306         if (!crtc->name) {
 307                 drm_mode_object_unregister(dev, &crtc->base);
 308                 return -ENOMEM;
 309         }
 310
 311         crtc->fence_context = dma_fence_context_alloc(1);
 312         spin_lock_init(&crtc->fence_lock);
 313         snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
 314                  "CRTC:%d-%s", crtc->base.id, crtc->name);
 315
 316         crtc->base.properties = &crtc->properties;
 317
 318         list_add_tail(&crtc->head, &config->crtc_list);
 319         crtc->index = config->num_crtc++;
 320
 321         crtc->primary = primary;
 322         crtc->cursor = cursor;
 323         if (primary && !primary->possible_crtcs)
 324                 primary->possible_crtcs = 1 << drm_crtc_index(crtc);
 325         if (cursor && !cursor->possible_crtcs)
 326                 cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
 327
 328         ret = drm_crtc_crc_init(crtc);
 329         if (ret) {
 330                 drm_mode_object_unregister(dev, &crtc->base);
 331                 return ret;
 332         }
 333
 334         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 335                 drm_object_attach_property(&crtc->base, config->prop_active, 0);
 336                 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 337                 drm_object_attach_property(&crtc->base,
 338                                            config->prop_out_fence_ptr, 0);
 339         }
 340
 341         return 0;
 342 }
 343 EXPORT_SYMBOL(drm_crtc_init_with_planes);
 344
 345 /**
 346  * drm_crtc_cleanup - Clean up the core crtc usage
 347  * @crtc: CRTC to cleanup
 348  *
 349  * This function cleans up @crtc and removes it from the DRM mode setting
 350  * core. Note that the function does *not* free the crtc structure itself,
 351  * this is the responsibility of the caller.
 352  */
 353 void drm_crtc_cleanup(struct drm_crtc *crtc)
 354 {
 355         struct drm_device *dev = crtc->dev;
 356
 357         /* Note that the crtc_list is considered to be static; should we
 358          * remove the drm_crtc at runtime we would have to decrement all
 359          * the indices on the drm_crtc after us in the crtc_list.
 360          */
 361
 362         drm_crtc_crc_fini(crtc);
 363
 364         kfree(crtc->gamma_store);
 365         crtc->gamma_store = NULL;
 366
 367         drm_modeset_lock_fini(&crtc->mutex);
 368
 369         drm_mode_object_unregister(dev, &crtc->base);
 370         list_del(&crtc->head);
 371         dev->mode_config.num_crtc--;
 372
 373         WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
 374         if (crtc->state && crtc->funcs->atomic_destroy_state)
 375                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 376
 377         kfree(crtc->name);
 378
 379         memset(crtc, 0, sizeof(*crtc));
 380 }
 381 EXPORT_SYMBOL(drm_crtc_cleanup);
 382
 383 /**
 384  * drm_mode_getcrtc - get CRTC configuration
 385  * @dev: drm device for the ioctl
 386  * @data: data pointer for the ioctl
 387  * @file_priv: drm file for the ioctl call
 388  *
 389  * Construct a CRTC configuration structure to return to the user.
 390  *
 391  * Called by the user via ioctl.
 392  *
 393  * Returns:
 394  * Zero on success, negative errno on failure.
 395  */
 396 int drm_mode_getcrtc(struct drm_device *dev,
 397                      void *data, struct drm_file *file_priv)
 398 {
 399         struct drm_mode_crtc *crtc_resp = data;
 400         struct drm_crtc *crtc;
 401
 402         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 403                 return -EINVAL;
 404
 405         crtc = drm_crtc_find(dev, crtc_resp->crtc_id);
 406         if (!crtc)
 407                 return -ENOENT;
 408
 409         crtc_resp->gamma_size = crtc->gamma_size;
 410
 411         drm_modeset_lock(&crtc->primary->mutex, NULL);
 412         if (crtc->primary->state && crtc->primary->state->fb)
 413                 crtc_resp->fb_id = crtc->primary->state->fb->base.id;
 414         else if (!crtc->primary->state && crtc->primary->fb)
 415                 crtc_resp->fb_id = crtc->primary->fb->base.id;
 416         else
 417                 crtc_resp->fb_id = 0;
 418
 419         if (crtc->primary->state) {
 420                 crtc_resp->x = crtc->primary->state->src_x >> 16;
 421                 crtc_resp->y = crtc->primary->state->src_y >> 16;
 422         }
 423         drm_modeset_unlock(&crtc->primary->mutex);
 424
 425         drm_modeset_lock(&crtc->mutex, NULL);
 426         if (crtc->state) {
 427                 if (crtc->state->enable) {
 428                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 429                         crtc_resp->mode_valid = 1;
 430
 431                 } else {
 432                         crtc_resp->mode_valid = 0;
 433                 }
 434         } else {
 435                 crtc_resp->x = crtc->x;
 436                 crtc_resp->y = crtc->y;
 437                 if (crtc->enabled) {
 438                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 439                         crtc_resp->mode_valid = 1;
 440
 441                 } else {
 442                         crtc_resp->mode_valid = 0;
 443                 }
 444         }
 445         drm_modeset_unlock(&crtc->mutex);
 446
 447         return 0;
 448 }
 449
 450 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
 451                                           struct drm_modeset_acquire_ctx *ctx)
 452 {
 453         struct drm_crtc *crtc = set->crtc;
 454         struct drm_framebuffer *fb;
 455         struct drm_crtc *tmp;
 456         int ret;
 457
 458         /*
 459          * NOTE: ->set_config can also disable other crtcs (if we steal all
 460          * connectors from it), hence we need to refcount the fbs across all
 461          * crtcs. Atomic modeset will have saner semantics ...
 462          */
 463         drm_for_each_crtc(tmp, crtc->dev)
 464                 tmp->primary->old_fb = tmp->primary->fb;
 465
 466         fb = set->fb;
 467
 468         ret = crtc->funcs->set_config(set, ctx);
 469         if (ret == 0) {
 470                 crtc->primary->crtc = crtc;
 471                 crtc->primary->fb = fb;
 472         }
 473
 474         drm_for_each_crtc(tmp, crtc->dev) {
 475                 if (tmp->primary->fb)
 476                         drm_framebuffer_get(tmp->primary->fb);
 477                 if (tmp->primary->old_fb)
 478                         drm_framebuffer_put(tmp->primary->old_fb);
 479                 tmp->primary->old_fb = NULL;
 480         }
 481
 482         return ret;
 483 }
 484 /**
 485  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 486  * @set: modeset config to set
 487  *
 488  * This is a little helper to wrap internal calls to the
 489  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 490  * correct refcounting dance.
 491  *
 492  * This should only be used by non-atomic legacy drivers.
 493  *
 494  * Returns:
 495  * Zero on success, negative errno on failure.
 496  */
 497 int drm_mode_set_config_internal(struct drm_mode_set *set)
 498 {
 499         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 500
 501         return __drm_mode_set_config_internal(set, NULL);
 502 }
 503 EXPORT_SYMBOL(drm_mode_set_config_internal);
 504
 505 /**
 506  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 507  *     CRTC viewport
 508  * @crtc: CRTC that framebuffer will be displayed on
 509  * @x: x panning
 510  * @y: y panning
 511  * @mode: mode that framebuffer will be displayed under
 512  * @fb: framebuffer to check size of
 513  */
 514 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 515                             int x, int y,
 516                             const struct drm_display_mode *mode,
 517                             const struct drm_framebuffer *fb)
 518
 519 {
 520         int hdisplay, vdisplay;
 521
 522         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 523
 524         if (crtc->state &&
 525             drm_rotation_90_or_270(crtc->primary->state->rotation))
 526                 swap(hdisplay, vdisplay);
 527
 528         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 529                                                 hdisplay << 16, vdisplay << 16,
 530                                                 fb);
 531 }
 532 EXPORT_SYMBOL(drm_crtc_check_viewport);
 533
 534 /**
 535  * drm_mode_setcrtc - set CRTC configuration
 536  * @dev: drm device for the ioctl
 537  * @data: data pointer for the ioctl
 538  * @file_priv: drm file for the ioctl call
 539  *
 540  * Build a new CRTC configuration based on user request.
 541  *
 542  * Called by the user via ioctl.
 543  *
 544  * Returns:
 545  * Zero on success, negative errno on failure.
 546  */
 547 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 548                      struct drm_file *file_priv)
 549 {
 550         struct drm_mode_config *config = &dev->mode_config;
 551         struct drm_mode_crtc *crtc_req = data;
 552         struct drm_crtc *crtc;
 553         struct drm_connector **connector_set = NULL, *connector;
 554         struct drm_framebuffer *fb = NULL;
 555         struct drm_display_mode *mode = NULL;
 556         struct drm_mode_set set;
 557         uint32_t __user *set_connectors_ptr;
 558         struct drm_modeset_acquire_ctx ctx;
 559         int ret;
 560         int i;
 561
 562         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 563                 return -EINVAL;
 564
 565         /*
 566          * Universal plane src offsets are only 16.16, prevent havoc for
 567          * drivers using universal plane code internally.
 568          */
 569         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 570                 return -ERANGE;
 571
 572         crtc = drm_crtc_find(dev, crtc_req->crtc_id);
 573         if (!crtc) {
 574                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 575                 return -ENOENT;
 576         }
 577         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 578
 579         mutex_lock(&crtc->dev->mode_config.mutex);
 580         drm_modeset_acquire_init(&ctx, 0);
 581 retry:
 582         ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
 583         if (ret)
 584                 goto out;
 585         if (crtc_req->mode_valid) {
 586                 /* If we have a mode we need a framebuffer. */
 587                 /* If we pass -1, set the mode with the currently bound fb */
 588                 if (crtc_req->fb_id == -1) {
 589                         if (!crtc->primary->fb) {
 590                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 591                                 ret = -EINVAL;
 592                                 goto out;
 593                         }
 594                         fb = crtc->primary->fb;
 595                         /* Make refcounting symmetric with the lookup path. */
 596                         drm_framebuffer_get(fb);
 597                 } else {
 598                         fb = drm_framebuffer_lookup(dev, crtc_req->fb_id);
 599                         if (!fb) {
 600                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 601                                                 crtc_req->fb_id);
 602                                 ret = -ENOENT;
 603                                 goto out;
 604                         }
 605                 }
 606
 607                 mode = drm_mode_create(dev);
 608                 if (!mode) {
 609                         ret = -ENOMEM;
 610                         goto out;
 611                 }
 612
 613                 ret = drm_mode_convert_umode(mode, &crtc_req->mode);
 614                 if (ret) {
 615                         DRM_DEBUG_KMS("Invalid mode\n");
 616                         goto out;
 617                 }
 618
 619                 /*
 620                  * Check whether the primary plane supports the fb pixel format.
 621                  * Drivers not implementing the universal planes API use a
 622                  * default formats list provided by the DRM core which doesn't
 623                  * match real hardware capabilities. Skip the check in that
 624                  * case.
 625                  */
 626                 if (!crtc->primary->format_default) {
 627                         ret = drm_plane_check_pixel_format(crtc->primary,
 628                                                            fb->format->format);
 629                         if (ret) {
 630                                 struct drm_format_name_buf format_name;
 631                                 DRM_DEBUG_KMS("Invalid pixel format %s\n",
 632                                               drm_get_format_name(fb->format->format,
 633                                                                   &format_name));
 634                                 goto out;
 635                         }
 636                 }
 637
 638                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 639                                               mode, fb);
 640                 if (ret)
 641                         goto out;
 642
 643         }
 644
 645         if (crtc_req->count_connectors == 0 && mode) {
 646                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 647                 ret = -EINVAL;
 648                 goto out;
 649         }
 650
 651         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 652                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 653                           crtc_req->count_connectors);
 654                 ret = -EINVAL;
 655                 goto out;
 656         }
 657
 658         if (crtc_req->count_connectors > 0) {
 659                 u32 out_id;
 660
 661                 /* Avoid unbounded kernel memory allocation */
 662                 if (crtc_req->count_connectors > config->num_connector) {
 663                         ret = -EINVAL;
 664                         goto out;
 665                 }
 666
 667                 connector_set = kmalloc_array(crtc_req->count_connectors,
 668                                               sizeof(struct drm_connector *),
 669                                               GFP_KERNEL);
 670                 if (!connector_set) {
 671                         ret = -ENOMEM;
 672                         goto out;
 673                 }
 674
 675                 for (i = 0; i < crtc_req->count_connectors; i++) {
 676                         connector_set[i] = NULL;
 677                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 678                         if (get_user(out_id, &set_connectors_ptr[i])) {
 679                                 ret = -EFAULT;
 680                                 goto out;
 681                         }
 682
 683                         connector = drm_connector_lookup(dev, out_id);
 684                         if (!connector) {
 685                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 686                                                 out_id);
 687                                 ret = -ENOENT;
 688                                 goto out;
 689                         }
 690                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 691                                         connector->base.id,
 692                                         connector->name);
 693
 694                         connector_set[i] = connector;
 695                 }
 696         }
 697
 698         set.crtc = crtc;
 699         set.x = crtc_req->x;
 700         set.y = crtc_req->y;
 701         set.mode = mode;
 702         set.connectors = connector_set;
 703         set.num_connectors = crtc_req->count_connectors;
 704         set.fb = fb;
 705         ret = __drm_mode_set_config_internal(&set, &ctx);
 706
 707 out:
 708         if (fb)
 709                 drm_framebuffer_put(fb);
 710
 711         if (connector_set) {
 712                 for (i = 0; i < crtc_req->count_connectors; i++) {
 713                         if (connector_set[i])
 714                                 drm_connector_put(connector_set[i]);
 715                 }
 716         }
 717         kfree(connector_set);
 718         drm_mode_destroy(dev, mode);
 719         if (ret == -EDEADLK) {
 720                 drm_modeset_backoff(&ctx);
 721                 goto retry;
 722         }
 723         drm_modeset_drop_locks(&ctx);
 724         drm_modeset_acquire_fini(&ctx);
 725         mutex_unlock(&crtc->dev->mode_config.mutex);
 726
 727         return ret;
 728 }
 729
 730 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 731                                struct drm_property *property,
 732                                uint64_t value)
 733 {
 734         int ret = -EINVAL;
 735         struct drm_crtc *crtc = obj_to_crtc(obj);
 736
 737         if (crtc->funcs->set_property)
 738                 ret = crtc->funcs->set_property(crtc, property, value);
 739         if (!ret)
 740                 drm_object_property_set_value(obj, property, value);
 741
 742         return ret;
 743 }