[alsa-devel] WM9712 Not Giving output

[Marek Vasut]

Dne Friday 01 of August 2008 19:27:24 Nitin Mahajan napsal(a):
> HI!
>
> --- On Fri, 1/8/08, Mark Brown <broonie at opensource.wolfsonmicro.com> wrote:
> > From: Mark Brown <broonie at opensource.wolfsonmicro.com>
> > Subject: Re: [alsa-devel] WM9712 Not Giving output
> > To: "Nitin Mahajan" <nitinm76 at yahoo.com>
> > Cc: alsa-devel at alsa-project.org, "Manuel" <mano at roarinelk.homelinux.net>
> > Date: Friday, 1 August, 2008, 9:32 PM
> > On Fri, Aug 01, 2008 at 08:31:03AM -0700, Nitin Mahajan
> >
> > wrote:
> > > I am using a WM9712 codec chip with the AC97
> >
> > controller on AMD AU1250.
> >
> > > Linux kernel version 2.6.24.2.
> > >
> > > On AC97 controller's side, I can see the DMA
> >
> > happening on the host
> >
> > > processor, interrupts also coming.
> >
> > This suggests a mixer configuration problem.
> >
> > > On the mixer front, I did unmute and set the vol to
> >
> > max for PCM and
> >
> > > Headphone. I did not find any Master control with this
> >
> > chip. Isn't
> >
> > > there any master control with this chip?
> >
> > No.
>
> If Master is not there, logically are the enough for playback?
>
> amixer set 'PCM' 255 unmute
> amixer set 'Headphone' 255 unmute
>
> > > Can some one please throw more light on the Mixer
> >
> > part, specific to
> >
> > > this chip.
> > >
> > > What Mixer controls do I need to set with what values
> >
> > for playback and
> >
> > > capture respectively with this chip?
> >
> > Check the configuration of the Left HP Mixer and Right HP
> > Mixer PCM
> > Playback switches.  These should be enabled in order to
> > play back via
> > the headphone output.
>
> While writing the reply , the hardware is not with me.
> But I wil check these tommorow.
>
> > If you still can't get audio output with that please
> > send a copy of your
> > mixer configuration - run the command
> >
> > 	alsactl store -f mixer-config
> >
> > to write a file 'mixer-config' with this
> > information in it.  Please
> > also check your kernel log from when the driver is loaded
> > and when you
> > configure the mixer.
> >
> > There is documentation of the audio paths supported by the
> > chip in the
>
> I saw the figure in  the datasheet, its quite explainatory, as to which
> registers are involved in which path.
>
> > datasheet, available from:
> >
> > 	http://www.wolfsonmicro.com/products/WM9712/
> >
> >
> > and you may find the audio route mappings in the WM9712
> > driver useful to
> > refer to - the 'audio_map' table in the driver
> > which shows how the parts
> > of the device are connected.  The format is { destination,
> > control,
> > source }.
>
> Thanks and regards
>
> -Nitin
>
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Hi,
try searching the mailing list for "[PATCH] wm9712 mono mixer". That may help 
you.