On Mon, 30 Jul 2018 18:09:38 +0200, Jorge wrote: > > > > On 30/07/18 14:13, Takashi Iwai wrote: > > On Mon, 30 Jul 2018 11:23:36 +0200, > > Jorge Sanjuan wrote: > >> > >> Make use of UAC3 Power Domains associated to an Audio Streaming > >> path within the PCM's logic. This means, when there is no audio > >> being transferred (pcm is closed), the host will set the Power Domain > >> associated to that substream to state D1. When audio is being transferred > >> (from hw_params onwards), the Power Domain will be set to D0 state. > >> > >> This is the way the host lets the device know which Terminal > >> is going to be actively used and it is for the device to > >> manage its own internal resources on that UAC3 Power Domain. > >> > >> Note the resume method now sets the Power Domain to D1 state as > >> resuming the device doesn't mean audio streaming will occur. > > > > I guess we need the power state transition to D0 also in prepare > > callback. The recovery from suspend doesn't need hw_params call but > > just prepare -> trigger. > > Right! Shouldn't it then be enough to just go to D0 on .prepare? I,e. > Move the state transition from .hw_params to .prepare. Does the power domain transition needed for setting the format, EP, etc done in set_format()? If yes, we need D0 in hw_parmas as well. thanks, Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
