[alsa-devel] AT32AP7000 (AVR32) + WM8510

Mark Brown broonie at opensource.wolfsonmicro.com
Thu May 22 21:46:21 CEST 2008

On Thu, May 22, 2008 at 11:20:08AM -0500, Geoffrey Wossum wrote:

> stream.  A patch is found a the bottom of this email.  With this patch, the 
> registers on the WM8510 seem to be getting configured properly (all the clock 
> rates and such look correct), but I get no signal at the speaker outputs or 

Almost of this looks good, thanks for spotting these!  I've applied the
bits I was able to check, see below for one issue.  Note that when
submitting changes it's always best to supply a Signed-off-by, though
for changes like this it's probably OK not to.

> the mono output, no matter what the mixer settings are.  They just sit VMID 
> after the initial power up of the chip.  

Check that all the required DAPM widgets are powered up by looking in
/sys/bus/platform/devices/soc-audio/dapm_widget during playback - if
they aren't then enabling DAPM_DEBUG in sound/soc/soc-dapm.c will make
DAPM display information about the decisions it's making.  If you can't
see anything there could you please supply a register dump from during
playback (availible in /sys/bus/platform/devices/soc-audio/codec_reg)?

I'm out of the office at the minute so can't test on actual hardware
myself right now.

> @@ -597,14 +597,14 @@ struct snd_soc_codec_dai wm8510_dai = {
>  	.name = "WM8510 HiFi",
>  	.playback = {
>  		.stream_name = "Playback",
> -		.channels_min = 1,
> -		.channels_max = 1,
> +		.channels_min = 2,
> +		.channels_max = 2,
>  		.rates = WM8510_RATES,

I'll need to check this out in more detail - the WM8510 is a mono codec
so it can only play one channel.

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