On Fri, Apr 12, 2019 at 12:03:35PM +0200, kernel@xxxxxxxxxxxxxxxx wrote: > > On 12.04.2019, at 11:47, Mark Brown <broonie@xxxxxxxxxx> wrote: > >> In a previous version of this I suggested to Meghana to put this in the > >> driver, but Mark wanted it in the core. > > If we want to do this at a lower level the DMA code could hide this > > limitation from the upper layers; presumably the SPI driver isn't the > > only thing that might run into this. > For clarification: > There is a register of the SPI controller where you have to configure the > number of bytes that it will request via DMA (primarily support transfers > that are not a multiple of 4 - the data is transferred by DMA as words). > So it is not really related to the general DMA implementation but to the > DMA (request) support of the SPI controller. Ah, I see. That's unfortunate :/
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