Dne Friday 01 of August 2008 19:59:44 Nitin Mahajan napsal(a):
HI!
--- On Fri, 1/8/08, Marek Vasut marek.vasut@gmail.com wrote:
From: Marek Vasut marek.vasut@gmail.com Subject: Re: [alsa-devel] WM9712 Not Giving output To: alsa-devel@alsa-project.org, nitinm76@yahoo.com Date: Friday, 1 August, 2008, 11:10 PM Dne Friday 01 of August 2008 19:27:24 Nitin Mahajan
napsal(a):
HI!
--- On Fri, 1/8/08, 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"
Cc: alsa-devel@alsa-project.org,
"Manuel" mano@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.
Interesting, do you mean that "Right HP Mixer" and "Left HP Mixer" should be "Right Mixer" and "Left Mixer" ?
thanks and regards
-Nitin
yea, and you should see alsa warning about it in kernel log as well.
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