On Thu, Mar 17, 2016 at 11:58:05AM +0100, Michal Suchanek wrote: > On 17 March 2016 at 08:27, Maxime Ripard > > You're mixing two things up: the fact that we can't do more than the > > FIFO length in PIO and that we're missing DMA support. We have patches > > to address both, and there's no depedency between the two. > The only thing is that although DMA is optional on pretty much any > system you will have DMA available unless you broke your config. You > really do want the DMA support when it is available. So there will be > nobody testing the non-DMA part and it will be prone to bitrot. Well, it might be worth doing PIO for very short transfers even if you have DMA - it's quite common for this to perform better.
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