RE: [PATCH AUTOSEL for 4.9 31/56] ASoC: da7218: Set DAI output pin high impedance when not in use

[Adam Thomson]

On 15 November 2017 16:43, alexander.levin@xxxxxxxxxxx wrote:

> On Wed, Nov 15, 2017 at 12:19:18PM +0000, Mark Brown wrote:
> >On Wed, Nov 15, 2017 at 02:45:42AM +0000, alexander.levin@xxxxxxxxxxx wrote:
> >
> >> This patch updates the AIF_OUT widget to set the DAI output pin of
> >> the device as high impedance when not in use.
> >
> >This will leave the line floating which EEs don't always like.  It's
> >probably OK and hasn't lead to any reports in mainline yet but still...
> 
> The idea I got from the patch is that output will not be working if
> there are multiple codecs?

Yes, if there are multiple codecs sharing the same DAI line for capture as
DA7217/8, and we don't set this to high impedance, then it will interfere with
the other codecs' capture data.