From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Subject: Re: [PATCH 2/2] ALSA: hda: support for wallclock
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Date: Sat, 29 Sep 2012 15:12:29 -0500
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On 09/28/2012 04:33 AM, Clemens Ladisch wrote:
> Pierre-Louis Bossart wrote:
>> @@ -1712,6 +1777,7 @@ static struct snd_pcm_hardware azx_pcm_hw = {
>>   				 /* SNDRV_PCM_INFO_RESUME |*/
>>   				 SNDRV_PCM_INFO_PAUSE |
>>   				 SNDRV_PCM_INFO_SYNC_START |
>> +				 SNDRV_PCM_INFO_HAS_WALL_CLOCK |
>
> ... but not if this device is connected to an S/PDIF input.

Yeah, but I can't figure out what happens here. HDAudio is the clock 
master in all cases, unless the audio codec does an ASRC I don't think 
this works. I've looked at the spec several times, asked around, this 
case looks wild.