On Wed, Jun 17, 2020 at 07:46:35PM +0200, Stephan Gerhold wrote:

> At the end the question is if those machine drivers that have
> dpcm_playback/capture hardcoded just set it because it was required to
> make DPCM work, or if they actually use it to restrict the direction of
> a DAI link.

The other question would be if they are restricting it to limit the
direction of a DAI link beyond the limits that the hardware has why are
they doing that?  I'm not sure that'd be a sensible thing to do.