[alsa-devel] [PATCH V2] ASoC: fix hdmi codec driver contest in S3

[Takashi Iwai]

On Tue, 26 Mar 2019 09:46:31 +0100,
Yang, Libin wrote:
> 
> Hi Takashi
> 
> >
> >In the case of legacy HD-audio, we "fixed" the problem by avoiding the trigger
> >of async work at resume, but let it be triggered from runtime resume.  In ASoC
> >case, however, it's no option.
> >
> >Maybe a possible solution in the sound driver side would be to move from
> >system suspend/resume to ASoC component suspend/resume.  The runtime
> >suspend/resume can be kept as is, and call pm_runtime_force_suspend and
> >resume from the component suspend/resume callbacks.  Since the
> >component callbacks are certainly processed before DAPM events, this should
> >assure the order.
> 
> I tried to move display power setting from runtime suspend/resume to 
> component suspend/resume. I found there may be another issue:
> playback will NOT call component suspend/resume.
> This  means we will never have chance to set the display power if
> we don't do the S3.

The runtime suspend/resume are fine and need to be kept, I suppose.
The only problem is the system suspend/resume callbacks that call
pm_runtime_force_*().  Just moving these two to component would work?


Takashi