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Some controllers require waiting for the bus to become idle before writing to some registers. I have implemented this by adding a hook to sd_ctrl_write16() and implementing a hook for SDHI which waits for the bus to become idle. Cc: Guennadi Liakhovetski <[email protected]> Cc: Magnus Damm <[email protected]> Signed-off-by: Simon Horman <[email protected]> Signed-off-by: Chris Ball <[email protected]>