[alsa-devel] SGTL5000

[Erik Friesen]

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On Feb 6, 2016 8:52 AM, "Erik Friesen" <friesendrywall at gmail.com> wrote:

> Is this list active?  Can someone at least confirm the alsa-devel
> filter isn't kicking my emails out?
>
> I have a couple suggested changes to sgtl5000.c.
>
> On Wed, Feb 3, 2016 at 12:06 PM, Erik Friesen <friesendrywall at gmail.com>
> wrote:
> > I was sort of directed to this list from linux-arm.
> >
> > I have been working with an embeddedarm ts4900 and built a baseboard
> > that uses the sgtl5000.  I also have worked with the RiotBoard, which
> > uses the same chip, both using the i.mx6 arm.  I find that
> > occasionally the sgtl5000 is resetting, and there is no way to bring
> > it back online.  As near as I can tell, the i2c bus comes back alive,
> > for example alsamixer communicates fine, coms happen on the i2c bus
> > per scope.  However, its obvious the chip never gets re initialized by
> > how it acts.
> >
> > I know the thing shouldn't reset, that is the primary problem, but I
> > still want some backup method.  Its probably due to ground bounce from
> > a non earth grounded setup.  It could be that using the external
> > regulator will help, we will see.
> >
> > Is there a suggestion on a way the sgtl5000.c could be extended to
> > support some sort of re initialize routine?
> >
> > I am using the embeddedarm repo as a base kernel.  sgtl5000.c has been
> > updated to include
> > ret = sgtl5000_fill_defaults(sgtl5000);
> > but the base kernel is 3.10.53.  However, the riotboard runs 4.3 with
> > similar results.
>