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The HVS supports mixing fixed alpha with per-pixel alpha or setting a fixed plane alpha in case there is no per-pixel information. This allows us to support the generic DRM plane alpha property. Signed-off-by: Stefan Schake <stschake@gmail.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20180421000954.18936-1-stschake@gmail.com