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

[Yang, Libin]

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.

Regards,
Libin

>
>
>thanks,
>
>Takashi