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This commit fixes the potential misalignment between the value of device tree property "dma-coherent" and default value of COHERENCY_ENABLE register. Panthor driver didn't explicitly program the COHERENCY_ENABLE register with the desired coherency mode. The default value of COHERENCY_ENABLE register is implementation defined, so it may not be always aligned with the "dma-coherent" property value. The commit also checks the COHERENCY_FEATURES register to confirm that the coherency protocol is actually supported or not. v2: - Added R-b tags Signed-off-by: Akash Goel <akash.goel@arm.com> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> Reviewed-by: Steven Price <steven.price@arm.com> Link: https://lore.kernel.org/r/20241030225407.4077513-3-akash.goel@arm.com Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>