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serial: 8250: Validate dmaengine rx chan meets requirements
8250 dma support requires the dmaengine driver support error-free pause/terminate and better-than-descriptor residue granularity. Query slave caps to determine if necessary commands/properties are supported; disable dma if not. Note this means dmaengine driver must support slave caps reporting as well. Signed-off-by: Peter Hurley <[email protected]> Reviewed-by: Heikki Krogerus <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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