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The is_cache_coherent() function currently returns true when the mapping is not cache-coherent. This isn't a bug as such as the callers interpret cache-coherent as meaning that the driver has to handle the coherency manually, but it is nonetheless very confusing. Fix it and add a bit more documentation to explain how cached buffers are handled. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>