On Mon, 13 May 2019 11:00:18 +0200, Kailang wrote: > > Hi Takashi, > > When System Boot up. > The Hda Driver running step was as below. > > alc_init(); > alc_shutup(); > alc_init(); > > The depop procedure was put in spec->init_hook and spec->shutup. > > But I find more codec which run spec->shutup at boot up. It will occur pop noise. > If it doesn't run spec->shutup, it will not occur pop noise or reduce pop noise. > > How could the spec->shutup not run at boot up? > > I ever test to put the check in spec->shutup() for PM_EVENT_SUSPEND and PM_EVENT_HIBERNATE and shutdown. > But if power_save=1, it was have issue for this. > Codec was idle already in power_save=1 state. If system go suspend, it will not run spec->shutup() again. I guess it's a runtime PM, hence it's neither PM_EVENT_SUSPEND nor PM_EVENT_HIBERNATE. Actually, if the shutup procedure makes the problem on a certain platform, just skip it. It's an optional behavior and would be fine without it (of course only if it's confirmed to work :) Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
