Re: [PATCH 17/53] ALSA: x86: Drop unused hw_silence field

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

On 02/02/2017 02:04 PM, Takashi Iwai wrote:
> On Thu, 02 Feb 2017 20:11:10 +0100,
> Pierre-Louis Bossart wrote:
>> On 2/2/17 11:02 AM, Takashi Iwai wrote:
>>> It's nowhere used.  Let's drop it.
>> That's one of the things I wanted to add. When you start playback
>> there is a 1-2s period where the receiver is still looking at the data
>> to figure out if it's PCM or compressed, and you lose those 1-2s of
>> audio. The hw silence mode is a way to keep the link active.
> I see.  Yes, the feature would be useful.
>
>> But I guess we can remove first and re-add later so no objections.
> Agreed.
>
> How would it be actually implemented?  Just avoid to turn off the
> audio config bits at trigger callback, etc?
>
> Since the runtime PM will be in the same game, we'll have to cope with
> it, too.
I must admit I don't remember the details, just that's it's the same 
behavior as the HDAudio KAE (Keep Alive Enable) functionality.

>
>
> thanks,
>
> Takashi