Hi Mark, Nicolin On Wed, May 6, 2020 at 10:33 AM Shengjiu Wang <shengjiu.wang@xxxxxxxxx> wrote: > > Hi > > On Fri, May 1, 2020 at 6:23 PM Mark Brown <broonie@xxxxxxxxxx> wrote: > > > > On Fri, May 01, 2020 at 04:12:05PM +0800, Shengjiu Wang wrote: > > > The difference for esai on imx8qm is that DMA device is EDMA. > > > > > > EDMA requires the period size to be multiple of maxburst. Otherwise > > > the remaining bytes are not transferred and thus noise is produced. > > > > If this constraint comes from the DMA controller then normally you'd > > expect the DMA controller integration to be enforcing this - is there no > > information in the DMA API that lets us know that this constraint is > > there? > > No, I can't find one API for this. > Do you have a recommendation? > could you please recommend which DMA API can I use? best regards wang shengjiu
