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drm: use new iterator in drm_gem_plane_helper_prepare_fb v3 

Makes the handling a bit more complex, but avoids the use of
dma_resv_get_excl_unlocked().

v2: improve coding and documentation
v3: adjust the TODO comment as suggested by Daniel

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20211005113742.1101-25-christian.koenig@amd.com
This commit is contained in:
Christian König 2021-09-13 13:47:53 +02:00
parent 4b2b5e142f
commit 525bbf72db
1 changed files with 12 additions and 2 deletions
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14
drivers/gpu/drm/drm_gem_atomic_helper.c
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@ -143,6 +143,7 @@
*/
int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
{
struct dma_resv_iter cursor;
struct drm_gem_object *obj;
struct dma_fence *fence;
@ -150,9 +151,18 @@ int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_st
return 0;
obj = drm_gem_fb_get_obj(state->fb, 0);
fence = dma_resv_get_excl_unlocked(obj->resv);
drm_atomic_set_fence_for_plane(state, fence);
dma_resv_iter_begin(&cursor, obj->resv, false);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
/* TODO: Currently there should be only one write fence, so this
* here works fine. But drm_atomic_set_fence_for_plane() should
* be changed to be able to handle more fences in general for
* multiple BOs per fb anyway. */
dma_fence_get(fence);
break;
}
dma_resv_iter_end(&cursor);
drm_atomic_set_fence_for_plane(state, fence);
return 0;
}
EXPORT_SYMBOL_GPL(drm_gem_plane_helper_prepare_fb);