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" nitinm76@yahoo.com 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.