drm/vc4: kms: Convert to atomic helpers
Now that the semaphore is gone, our atomic_commit implementation is basically drm_atomic_helper_commit with a somewhat custom commit_tail, the main difference being that we're using wait_for_flip_done instead of wait_for_vblanks used in the drm_atomic_helper_commit_tail helper. Let's switch to using drm_atomic_helper_commit. Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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