Re: [PATCH 5/5] RFC spi: sun4i: add DMA support

From: Mark Brown
Date: Tue May 31 2016 - 09:27:31 EST

On Tue, May 31, 2016 at 12:44:54PM +0200, Michal Suchanek wrote:
> On 30 May 2016 at 17:50, Mark Brown <broonie@xxxxxxxxxx> wrote:
> > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote:

> >> It's what the driver did to start with and it was requested to fall
> >> back to non-DMA in the case DMA is not available.

> > Why? I really can't see any sensible use case for this that doesn't
> > have a better solution available.

> Of course, the solution is to compile in the DMA driver.

> It's been argued that some drivers which use only short transfers will
> just work.

With nothing else in the system that needs DMA? It's making the
performance of the system less reliable for the benefit of a very narrow
use case.

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