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

[Pierre-Louis Bossart]

>>      Card dai_link has .ignore_suspend, and ALSA SoC cares it when suspend.
>>      For example, like this
>>     
>>              for_each_card_rtds(card, rtd) {
>>                      if (rtd->dai_link->ignore_suspend)
>>                              continue;
>>                      ...
>>              }
>>     
>>      But in snd_soc_suspend(), it doesn't care about
>>      it when suspending Component. This patch cares it.
>>
>> Morimoto-san,
>>
>> I am a bit skeptical about this change but I could be wrong.
>> I am not sure if the ignore_suspend field in the DAI link
>> definitions was meant to be applicable for the components as well.
>> Mark/Takashi would have to confirm this.

Even for dai links, it's not clear to me what .ignore_suspend means.

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.