[alsa-devel] [PATCH v4 07/13] soundwire: Add stream configuration APIs

[Vinod Koul]

On Mon, Apr 23, 2018 at 09:15:10AM +0530, Sanyog Kale wrote:
> On Sat, Apr 21, 2018 at 09:43:15PM +0530, Vinod Koul wrote:
> > On Sat, Apr 21, 2018 at 06:56:26AM -0700, Pierre-Louis Bossart wrote:
> > > >+	if (!bus->params.bandwidth) {
> > > >+		bus->params.row = 0;
> > > >+		bus->params.col = 0;
> > > >+		goto exit;
> > > 
> > > What is the intent with this test+goto? Shouldn't you program the parameters
> > > if you want to change the frame shape?
> > 
> > hmmm that seems correct point to me, but then we are going idle and should
> > ideally power down. Let me check again if that is the reason.
> 
> We do not want to program parameters or change frame shape in case of bandwidth
> required is 0 on bus (ie. no stream running). The row and col values are reset
> to 0 and will be re-computed again in prepare_stream of next stream based
> on stream requirement.

Yes that is right

On Mon, Apr 23, 2018 at 08:30:47AM -0500, Pierre-Louis Bossart wrote:
> 
> what about clock stop? what about the default frame shape specified in the
> DisCo spec? I don't see the reason why we'd go to 48x2 - especially on Intel
> platforms where we'll typically use  50x2 to remain aligned with a 48kHz
> frame rate.

But as Pierre pointed out ut should be using DisCo defaults and not 48x2 in
the bus. So I will remove this check and add a TODO for using DisCo value
here

Thanks
-- 
~Vinod