2 * Copyright (c) 2016 Intel Corporation
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 #include <linux/export.h>
25 #include <drm/drm_auth.h>
26 #include <drm/drm_framebuffer.h>
28 #include "drm_crtc_internal.h"
33 * Frame buffers are abstract memory objects that provide a source of pixels to
34 * scanout to a CRTC. Applications explicitly request the creation of frame
35 * buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque
36 * handle that can be passed to the KMS CRTC control, plane configuration and
37 * page flip functions.
39 * Frame buffers rely on the underlying memory manager for allocating backing
40 * storage. When creating a frame buffer applications pass a memory handle
41 * (or a list of memory handles for multi-planar formats) through the
42 * &struct drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace
43 * buffer management interface this would be a GEM handle. Drivers are however
44 * free to use their own backing storage object handles, e.g. vmwgfx directly
45 * exposes special TTM handles to userspace and so expects TTM handles in the
46 * create ioctl and not GEM handles.
48 * Framebuffers are tracked with &struct drm_framebuffer. They are published
49 * using drm_framebuffer_init() - after calling that function userspace can use
50 * and access the framebuffer object. The helper function
51 * drm_helper_mode_fill_fb_struct() can be used to pre-fill the required
54 * The lifetime of a drm framebuffer is controlled with a reference count,
55 * drivers can grab additional references with drm_framebuffer_reference() and
56 * drop them again with drm_framebuffer_unreference(). For driver-private
57 * framebuffers for which the last reference is never dropped (e.g. for the
58 * fbdev framebuffer when the struct &struct drm_framebuffer is embedded into
59 * the fbdev helper struct) drivers can manually clean up a framebuffer at
60 * module unload time with drm_framebuffer_unregister_private(). But doing this
61 * is not recommended, and it's better to have a normal free-standing &struct
65 int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
66 uint32_t src_w, uint32_t src_h,
67 const struct drm_framebuffer *fb)
69 unsigned int fb_width, fb_height;
71 fb_width = fb->width << 16;
72 fb_height = fb->height << 16;
74 /* Make sure source coordinates are inside the fb. */
75 if (src_w > fb_width ||
76 src_x > fb_width - src_w ||
78 src_y > fb_height - src_h) {
79 DRM_DEBUG_KMS("Invalid source coordinates "
80 "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
81 src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
82 src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
83 src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
84 src_y >> 16, ((src_y & 0xffff) * 15625) >> 10);
92 * drm_mode_addfb - add an FB to the graphics configuration
93 * @dev: drm device for the ioctl
94 * @data: data pointer for the ioctl
95 * @file_priv: drm file for the ioctl call
97 * Add a new FB to the specified CRTC, given a user request. This is the
98 * original addfb ioctl which only supported RGB formats.
100 * Called by the user via ioctl.
103 * Zero on success, negative errno on failure.
105 int drm_mode_addfb(struct drm_device *dev,
106 void *data, struct drm_file *file_priv)
108 struct drm_mode_fb_cmd *or = data;
109 struct drm_mode_fb_cmd2 r = {};
112 /* convert to new format and call new ioctl */
115 r.height = or->height;
116 r.pitches[0] = or->pitch;
117 r.pixel_format = drm_mode_legacy_fb_format(or->bpp, or->depth);
118 r.handles[0] = or->handle;
120 ret = drm_mode_addfb2(dev, &r, file_priv);
129 static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
131 const struct drm_format_info *info;
134 info = __drm_format_info(r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN);
136 struct drm_format_name_buf format_name;
137 DRM_DEBUG_KMS("bad framebuffer format %s\n",
138 drm_get_format_name(r->pixel_format,
143 if (r->width == 0 || r->width % info->hsub) {
144 DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width);
148 if (r->height == 0 || r->height % info->vsub) {
149 DRM_DEBUG_KMS("bad framebuffer height %u\n", r->height);
153 for (i = 0; i < info->num_planes; i++) {
154 unsigned int width = r->width / (i != 0 ? info->hsub : 1);
155 unsigned int height = r->height / (i != 0 ? info->vsub : 1);
156 unsigned int cpp = info->cpp[i];
158 if (!r->handles[i]) {
159 DRM_DEBUG_KMS("no buffer object handle for plane %d\n", i);
163 if ((uint64_t) width * cpp > UINT_MAX)
166 if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
169 if (r->pitches[i] < width * cpp) {
170 DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i);
174 if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
175 DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
180 if (r->flags & DRM_MODE_FB_MODIFIERS &&
181 r->modifier[i] != r->modifier[0]) {
182 DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
187 /* modifier specific checks: */
188 switch (r->modifier[i]) {
189 case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
190 /* NOTE: the pitch restriction may be lifted later if it turns
191 * out that no hw has this restriction:
193 if (r->pixel_format != DRM_FORMAT_NV12 ||
194 width % 128 || height % 32 ||
195 r->pitches[i] % 128) {
196 DRM_DEBUG_KMS("bad modifier data for plane %d\n", i);
206 for (i = info->num_planes; i < 4; i++) {
207 if (r->modifier[i]) {
208 DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i);
212 /* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
213 if (!(r->flags & DRM_MODE_FB_MODIFIERS))
217 DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i);
222 DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i);
227 DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i);
235 struct drm_framebuffer *
236 drm_internal_framebuffer_create(struct drm_device *dev,
237 const struct drm_mode_fb_cmd2 *r,
238 struct drm_file *file_priv)
240 struct drm_mode_config *config = &dev->mode_config;
241 struct drm_framebuffer *fb;
244 if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
245 DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags);
246 return ERR_PTR(-EINVAL);
249 if ((config->min_width > r->width) || (r->width > config->max_width)) {
250 DRM_DEBUG_KMS("bad framebuffer width %d, should be >= %d && <= %d\n",
251 r->width, config->min_width, config->max_width);
252 return ERR_PTR(-EINVAL);
254 if ((config->min_height > r->height) || (r->height > config->max_height)) {
255 DRM_DEBUG_KMS("bad framebuffer height %d, should be >= %d && <= %d\n",
256 r->height, config->min_height, config->max_height);
257 return ERR_PTR(-EINVAL);
260 if (r->flags & DRM_MODE_FB_MODIFIERS &&
261 !dev->mode_config.allow_fb_modifiers) {
262 DRM_DEBUG_KMS("driver does not support fb modifiers\n");
263 return ERR_PTR(-EINVAL);
266 ret = framebuffer_check(r);
270 fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
272 DRM_DEBUG_KMS("could not create framebuffer\n");
280 * drm_mode_addfb2 - add an FB to the graphics configuration
281 * @dev: drm device for the ioctl
282 * @data: data pointer for the ioctl
283 * @file_priv: drm file for the ioctl call
285 * Add a new FB to the specified CRTC, given a user request with format. This is
286 * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
287 * and uses fourcc codes as pixel format specifiers.
289 * Called by the user via ioctl.
292 * Zero on success, negative errno on failure.
294 int drm_mode_addfb2(struct drm_device *dev,
295 void *data, struct drm_file *file_priv)
297 struct drm_mode_fb_cmd2 *r = data;
298 struct drm_framebuffer *fb;
300 if (!drm_core_check_feature(dev, DRIVER_MODESET))
303 fb = drm_internal_framebuffer_create(dev, r, file_priv);
307 DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
308 r->fb_id = fb->base.id;
310 /* Transfer ownership to the filp for reaping on close */
311 mutex_lock(&file_priv->fbs_lock);
312 list_add(&fb->filp_head, &file_priv->fbs);
313 mutex_unlock(&file_priv->fbs_lock);
318 struct drm_mode_rmfb_work {
319 struct work_struct work;
320 struct list_head fbs;
323 static void drm_mode_rmfb_work_fn(struct work_struct *w)
325 struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work);
327 while (!list_empty(&arg->fbs)) {
328 struct drm_framebuffer *fb =
329 list_first_entry(&arg->fbs, typeof(*fb), filp_head);
331 list_del_init(&fb->filp_head);
332 drm_framebuffer_remove(fb);
337 * drm_mode_rmfb - remove an FB from the configuration
338 * @dev: drm device for the ioctl
339 * @data: data pointer for the ioctl
340 * @file_priv: drm file for the ioctl call
342 * Remove the FB specified by the user.
344 * Called by the user via ioctl.
347 * Zero on success, negative errno on failure.
349 int drm_mode_rmfb(struct drm_device *dev,
350 void *data, struct drm_file *file_priv)
352 struct drm_framebuffer *fb = NULL;
353 struct drm_framebuffer *fbl = NULL;
357 if (!drm_core_check_feature(dev, DRIVER_MODESET))
360 fb = drm_framebuffer_lookup(dev, *id);
364 mutex_lock(&file_priv->fbs_lock);
365 list_for_each_entry(fbl, &file_priv->fbs, filp_head)
369 mutex_unlock(&file_priv->fbs_lock);
373 list_del_init(&fb->filp_head);
374 mutex_unlock(&file_priv->fbs_lock);
376 /* drop the reference we picked up in framebuffer lookup */
377 drm_framebuffer_unreference(fb);
380 * we now own the reference that was stored in the fbs list
382 * drm_framebuffer_remove may fail with -EINTR on pending signals,
383 * so run this in a separate stack as there's no way to correctly
384 * handle this after the fb is already removed from the lookup table.
386 if (drm_framebuffer_read_refcount(fb) > 1) {
387 struct drm_mode_rmfb_work arg;
389 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
390 INIT_LIST_HEAD(&arg.fbs);
391 list_add_tail(&fb->filp_head, &arg.fbs);
393 schedule_work(&arg.work);
394 flush_work(&arg.work);
395 destroy_work_on_stack(&arg.work);
397 drm_framebuffer_unreference(fb);
402 drm_framebuffer_unreference(fb);
407 * drm_mode_getfb - get FB info
408 * @dev: drm device for the ioctl
409 * @data: data pointer for the ioctl
410 * @file_priv: drm file for the ioctl call
412 * Lookup the FB given its ID and return info about it.
414 * Called by the user via ioctl.
417 * Zero on success, negative errno on failure.
419 int drm_mode_getfb(struct drm_device *dev,
420 void *data, struct drm_file *file_priv)
422 struct drm_mode_fb_cmd *r = data;
423 struct drm_framebuffer *fb;
426 if (!drm_core_check_feature(dev, DRIVER_MODESET))
429 fb = drm_framebuffer_lookup(dev, r->fb_id);
433 r->height = fb->height;
434 r->width = fb->width;
435 r->depth = fb->format->depth;
436 r->bpp = fb->format->cpp[0] * 8;
437 r->pitch = fb->pitches[0];
438 if (fb->funcs->create_handle) {
439 if (drm_is_current_master(file_priv) || capable(CAP_SYS_ADMIN) ||
440 drm_is_control_client(file_priv)) {
441 ret = fb->funcs->create_handle(fb, file_priv,
444 /* GET_FB() is an unprivileged ioctl so we must not
445 * return a buffer-handle to non-master processes! For
446 * backwards-compatibility reasons, we cannot make
447 * GET_FB() privileged, so just return an invalid handle
448 * for non-masters. */
456 drm_framebuffer_unreference(fb);
462 * drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
463 * @dev: drm device for the ioctl
464 * @data: data pointer for the ioctl
465 * @file_priv: drm file for the ioctl call
467 * Lookup the FB and flush out the damaged area supplied by userspace as a clip
468 * rectangle list. Generic userspace which does frontbuffer rendering must call
469 * this ioctl to flush out the changes on manual-update display outputs, e.g.
470 * usb display-link, mipi manual update panels or edp panel self refresh modes.
472 * Modesetting drivers which always update the frontbuffer do not need to
473 * implement the corresponding &drm_framebuffer_funcs.dirty callback.
475 * Called by the user via ioctl.
478 * Zero on success, negative errno on failure.
480 int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
481 void *data, struct drm_file *file_priv)
483 struct drm_clip_rect __user *clips_ptr;
484 struct drm_clip_rect *clips = NULL;
485 struct drm_mode_fb_dirty_cmd *r = data;
486 struct drm_framebuffer *fb;
491 if (!drm_core_check_feature(dev, DRIVER_MODESET))
494 fb = drm_framebuffer_lookup(dev, r->fb_id);
498 num_clips = r->num_clips;
499 clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
501 if (!num_clips != !clips_ptr) {
506 flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
508 /* If userspace annotates copy, clips must come in pairs */
509 if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
514 if (num_clips && clips_ptr) {
515 if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
519 clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
525 ret = copy_from_user(clips, clips_ptr,
526 num_clips * sizeof(*clips));
533 if (fb->funcs->dirty) {
534 ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
543 drm_framebuffer_unreference(fb);
549 * drm_fb_release - remove and free the FBs on this file
550 * @priv: drm file for the ioctl
552 * Destroy all the FBs associated with @filp.
554 * Called by the user via ioctl.
557 * Zero on success, negative errno on failure.
559 void drm_fb_release(struct drm_file *priv)
561 struct drm_framebuffer *fb, *tfb;
562 struct drm_mode_rmfb_work arg;
564 INIT_LIST_HEAD(&arg.fbs);
567 * When the file gets released that means no one else can access the fb
568 * list any more, so no need to grab fpriv->fbs_lock. And we need to
569 * avoid upsetting lockdep since the universal cursor code adds a
570 * framebuffer while holding mutex locks.
572 * Note that a real deadlock between fpriv->fbs_lock and the modeset
573 * locks is impossible here since no one else but this function can get
576 list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
577 if (drm_framebuffer_read_refcount(fb) > 1) {
578 list_move_tail(&fb->filp_head, &arg.fbs);
580 list_del_init(&fb->filp_head);
582 /* This drops the fpriv->fbs reference. */
583 drm_framebuffer_unreference(fb);
587 if (!list_empty(&arg.fbs)) {
588 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
590 schedule_work(&arg.work);
591 flush_work(&arg.work);
592 destroy_work_on_stack(&arg.work);
596 void drm_framebuffer_free(struct kref *kref)
598 struct drm_framebuffer *fb =
599 container_of(kref, struct drm_framebuffer, base.refcount);
600 struct drm_device *dev = fb->dev;
603 * The lookup idr holds a weak reference, which has not necessarily been
604 * removed at this point. Check for that.
606 drm_mode_object_unregister(dev, &fb->base);
608 fb->funcs->destroy(fb);
612 * drm_framebuffer_init - initialize a framebuffer
614 * @fb: framebuffer to be initialized
615 * @funcs: ... with these functions
617 * Allocates an ID for the framebuffer's parent mode object, sets its mode
618 * functions & device file and adds it to the master fd list.
621 * This functions publishes the fb and makes it available for concurrent access
622 * by other users. Which means by this point the fb _must_ be fully set up -
623 * since all the fb attributes are invariant over its lifetime, no further
624 * locking but only correct reference counting is required.
627 * Zero on success, error code on failure.
629 int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
630 const struct drm_framebuffer_funcs *funcs)
634 if (WARN_ON_ONCE(fb->dev != dev || !fb->format))
637 INIT_LIST_HEAD(&fb->filp_head);
641 ret = drm_mode_object_get_reg(dev, &fb->base, DRM_MODE_OBJECT_FB,
642 false, drm_framebuffer_free);
646 mutex_lock(&dev->mode_config.fb_lock);
647 dev->mode_config.num_fb++;
648 list_add(&fb->head, &dev->mode_config.fb_list);
649 mutex_unlock(&dev->mode_config.fb_lock);
651 drm_mode_object_register(dev, &fb->base);
655 EXPORT_SYMBOL(drm_framebuffer_init);
658 * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
660 * @id: id of the fb object
662 * If successful, this grabs an additional reference to the framebuffer -
663 * callers need to make sure to eventually unreference the returned framebuffer
664 * again, using @drm_framebuffer_unreference.
666 struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
669 struct drm_mode_object *obj;
670 struct drm_framebuffer *fb = NULL;
672 obj = __drm_mode_object_find(dev, id, DRM_MODE_OBJECT_FB);
677 EXPORT_SYMBOL(drm_framebuffer_lookup);
680 * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
681 * @fb: fb to unregister
683 * Drivers need to call this when cleaning up driver-private framebuffers, e.g.
684 * those used for fbdev. Note that the caller must hold a reference of it's own,
685 * i.e. the object may not be destroyed through this call (since it'll lead to a
686 * locking inversion).
688 * NOTE: This function is deprecated. For driver-private framebuffers it is not
689 * recommended to embed a framebuffer struct info fbdev struct, instead, a
690 * framebuffer pointer is preferred and drm_framebuffer_unreference() should be
691 * called when the framebuffer is to be cleaned up.
693 void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
695 struct drm_device *dev;
702 /* Mark fb as reaped and drop idr ref. */
703 drm_mode_object_unregister(dev, &fb->base);
705 EXPORT_SYMBOL(drm_framebuffer_unregister_private);
708 * drm_framebuffer_cleanup - remove a framebuffer object
709 * @fb: framebuffer to remove
711 * Cleanup framebuffer. This function is intended to be used from the drivers
712 * &drm_framebuffer_funcs.destroy callback. It can also be used to clean up
713 * driver private framebuffers embedded into a larger structure.
715 * Note that this function does not remove the fb from active usage - if it is
716 * still used anywhere, hilarity can ensue since userspace could call getfb on
717 * the id and get back -EINVAL. Obviously no concern at driver unload time.
719 * Also, the framebuffer will not be removed from the lookup idr - for
720 * user-created framebuffers this will happen in in the rmfb ioctl. For
721 * driver-private objects (e.g. for fbdev) drivers need to explicitly call
722 * drm_framebuffer_unregister_private.
724 void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
726 struct drm_device *dev = fb->dev;
728 mutex_lock(&dev->mode_config.fb_lock);
730 dev->mode_config.num_fb--;
731 mutex_unlock(&dev->mode_config.fb_lock);
733 EXPORT_SYMBOL(drm_framebuffer_cleanup);
736 * drm_framebuffer_remove - remove and unreference a framebuffer object
737 * @fb: framebuffer to remove
739 * Scans all the CRTCs and planes in @dev's mode_config. If they're
740 * using @fb, removes it, setting it to NULL. Then drops the reference to the
741 * passed-in framebuffer. Might take the modeset locks.
743 * Note that this function optimizes the cleanup away if the caller holds the
744 * last reference to the framebuffer. It is also guaranteed to not take the
745 * modeset locks in this case.
747 void drm_framebuffer_remove(struct drm_framebuffer *fb)
749 struct drm_device *dev;
750 struct drm_crtc *crtc;
751 struct drm_plane *plane;
758 WARN_ON(!list_empty(&fb->filp_head));
761 * drm ABI mandates that we remove any deleted framebuffers from active
762 * useage. But since most sane clients only remove framebuffers they no
763 * longer need, try to optimize this away.
765 * Since we're holding a reference ourselves, observing a refcount of 1
766 * means that we're the last holder and can skip it. Also, the refcount
767 * can never increase from 1 again, so we don't need any barriers or
770 * Note that userspace could try to race with use and instate a new
771 * usage _after_ we've cleared all current ones. End result will be an
772 * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
775 if (drm_framebuffer_read_refcount(fb) > 1) {
776 drm_modeset_lock_all(dev);
777 /* remove from any CRTC */
778 drm_for_each_crtc(crtc, dev) {
779 if (crtc->primary->fb == fb) {
780 /* should turn off the crtc */
781 if (drm_crtc_force_disable(crtc))
782 DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
786 drm_for_each_plane(plane, dev) {
788 drm_plane_force_disable(plane);
790 drm_modeset_unlock_all(dev);
793 drm_framebuffer_unreference(fb);
795 EXPORT_SYMBOL(drm_framebuffer_remove);
798 * drm_framebuffer_plane_width - width of the plane given the first plane
799 * @width: width of the first plane
800 * @fb: the framebuffer
801 * @plane: plane index
804 * The width of @plane, given that the width of the first plane is @width.
806 int drm_framebuffer_plane_width(int width,
807 const struct drm_framebuffer *fb, int plane)
809 if (plane >= fb->format->num_planes)
815 return width / fb->format->hsub;
817 EXPORT_SYMBOL(drm_framebuffer_plane_width);
820 * drm_framebuffer_plane_height - height of the plane given the first plane
821 * @height: height of the first plane
822 * @fb: the framebuffer
823 * @plane: plane index
826 * The height of @plane, given that the height of the first plane is @height.
828 int drm_framebuffer_plane_height(int height,
829 const struct drm_framebuffer *fb, int plane)
831 if (plane >= fb->format->num_planes)
837 return height / fb->format->vsub;
839 EXPORT_SYMBOL(drm_framebuffer_plane_height);