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Zpos property is immutable for all hardware versions except the last version (0x40100) which support the blending order feature (dynamic z-order). Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com> Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220603134459.593379-1-yannick.fertre@foss.st.com