[alsa-devel] [PATCH v2 2/7] ASoC: soc-core: care .ignore_suspend for Component suspend

[Pierre-Louis Bossart]

On 12/18/19 11:14 AM, Mark Brown wrote:
> On Wed, Dec 18, 2019 at 08:54:27AM -0600, Pierre-Louis Bossart wrote:
> 
>> Even for dai links, it's not clear to me what .ignore_suspend means.
> 
> It means exactly what it says, don't do anything on suspend.
> 
>> For Intel machine drivers, the .ignore_suspend flag is used for DMIC links
>> which may be used in S0ix/D0ix states. I don't believe this works if there
>> are multiple target states, e.g. you would probably want to leave the link
>> active in S0ix, but suspend it in S3?
> 
>> I think the current .ignore_suspend settings only work with the assumption
>> that applications will close all capture streams before going to S3.
> 
> These numbered suspend states are a platform specific concept, other
> systems will typically just suspend or not suspend.  It sounds like this
> feature does not map onto your systems.

Correct. What is not clear to me is how we can specify a behavior that 
would be dependent on the target states.