drm/vc4: Set premultiplied for alpha formats
Alpha formats in DRM are assumed to be premultiplied, so we should be setting the PREMULT bit in the plane configuration for HVS. Changes from v1: - Use correct has_alpha Signed-off-by: NStefan Schake <stschake@gmail.com> Signed-off-by: NEric Anholt <eric@anholt.net> Reviewed-by: NEric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/1520556817-97297-2-git-send-email-stschake@gmail.com
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