On Sun, Nov 10, 2013 at 05:41:30PM +0100, Martin Sperl wrote:

> As explained - you would need to make an educated guess if a spi_transfer 
> chain has changed or not (and I talk about the need to check the chain 
> itself, speed, transferlength, rx_buff,tx_buff,... have not changed).

No, you're going off and talking about something else here.  You are
very focused on the idea of skipping some of the setup but that's not
the only thing being discussed.  Please try to separate the various
ideas.