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. One could think of implementing into the trigger, but since the transition needs some delay, prepare callback would be a better choice, as it seems. thanks, Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
