Re: [PATCH v4 2/4] spi: Split spi message into max_dma_len size chunks

[Lukas Wunner <lukas@xxxxxxxxx>]

On Fri, Apr 12, 2019 at 12:09:34PM +0100, Mark Brown wrote:
> On Fri, Apr 12, 2019 at 12:54:48PM +0200, Lukas Wunner wrote:
> > On Fri, Apr 12, 2019 at 10:47:21AM +0100, Mark Brown wrote:
> > > I *think* we managed to fix all the architectures to at least stub out
> > > the DMA interfaces, it's such a pointless thing to have conditional -
> > > it really only makes a difference for build coverage.
> 
> > My point was that the call to spi_split_transfers_maxsize() shouldn't
> > be called on non-DMA-capable platforms in the first place (because it's
> > DMA-specific).
> 
> It's not a DMA specific problem - there can be SPI controller
> limitations on transfer sizes too.

The call does pass in ctlr->max_dma_len though, so is clearly motivated
by a DMA limitation.