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AFBC has a mode that guarantees use of AFBC with an uncompressed payloads, we add a new modifier to support this mode. V2: updated modifier comment Signed-off-by: Ben Davis <ben.davis@arm.com> Acked-by: Liviu Dudau <liviu.dudau@arm.com> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200430083220.17347-1-ben.davis@arm.com