On Tue, May 12, 2020 at 10:48:41AM +0800, Shengjiu Wang wrote:
> On Wed, May 6, 2020 at 10:33 AM Shengjiu Wang <shengjiu.wang@gmail.com> wrote:
> > On Fri, May 1, 2020 at 6:23 PM Mark Brown <broonie@kernel.org> wrote:

> > > > 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?

Not off-hand, you'd probably need to extend the API to export the
information.