On Mon, Mar 31, 2014 at 09:54:03AM +0200, Gerhard Sittig wrote:

> No progress here.

> Eyeballing the code reveals that there is a 50 times 10-100us
> retry loop at the end of a transfer, waiting for RX to complete
> after TX has drained.  Instrumenting the code shows that the loop
> is run one or two times at most (longer timeouts are required for
> lower SPI wire speeds).  So I still can't see what might take
> several milliseconds.

Can you identify where in the code the delay is occurring (tracepoints
are often good for that) or is it just generally slower?

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