Re: [alsa-devel] WM9712 Not Giving output

6 Aug 2008


      HI!
--- On Wed, 6/8/08, Mark Brown broonie@opensource.wolfsonmicro.com wrote:
...
From: Mark Brown broonie@opensource.wolfsonmicro.com
Subject: Re: [alsa-devel] WM9712 Not Giving output
To: "Nitin Mahajan" nitinm76@yahoo.com
Cc: alsa-devel@alsa-project.org
Date: Wednesday, 6 August, 2008, 2:56 PM
On Tue, Aug 05, 2008 at 08:06:06PM -0700, Nitin Mahajan
wrote:
...
Here is the mixer-config file got through
'alsactl'. Could you please guide me which controls
to set with what values using amixer, for playback through
Headphone and Recording?
For playback try these:
...
control.4 {
   	comment.access 'read write'
   	comment.type BOOLEAN
   	comment.count 1
   	iface MIXER
   	name 'Headphone Playback Switch'
   	value false
   }
This should be enabled.
...
control.8 {
   	comment.access 'read write'
   	comment.type BOOLEAN
   	comment.count 1
   	iface MIXER
   	name 'Headphone Playback ZC Switch'
   	value false
   }
It's better to enable this but not essential - it
avoids audio artifacts
while doing volume updates during playback.
...
control.64 {
   	comment.access 'read write'
   	comment.type BOOLEAN
   	comment.count 1
   	iface MIXER
   	name 'Right Mixer PCM Playback Switch'
   	value false
   }
   control.65 {
   	comment.access 'read write'
   	comment.type BOOLEAN
   	comment.count 1
   	iface MIXER
   	name 'Left Mixer PCM Playback Switch'
   	value false
   }
These should be enabled.
If this still gives you trouble then please build with
DAPM_DEBUG
enabled in soc-dapm.c (or #define DEBUG at very the top of
the file
prior to the includes if using a very current version). 
This will cause
ASoC to produce debug output when it starts playback which
should show
anything that needs to be enabled but isn't.
Please also make sure that you are using a driver with the
patch that
Marek identified earlier in the thread.
Thanks I will try setting these for playback. Just for the Hardware verification I tried setting registers myself for the Mixer. I understand that finally thats not the right way. AS u suggested in earlier the gain was problem. I was making it as negative gain, which is as good as mute.
I kept it default and playback worked for me.
I am not able to make the Mic recording work now. Apart from the mixer controls, I identified these registers to be programmed with following values, which again to seperate out the problem area, H/w or S/w.I am using single ended mono microphone on Left i.e Mic 1.
Ox24h 0x0000
0x26h 0x0000
0x0Eh 0x6000
0x5Ch 0x0000
0x0Ah 0x7000
0x1Ch 0x0f00
0x20h 0x0000
Also , If I take the Linux-2.6.26 kernel from mips, can you tell me how to get the patch from wolfson ASOC git so that I have all the latest ASOC and WM related code?
I am not familiar with git :(.
Thanks in advance
regards
-Nitin
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