On Tue, 20 Oct 2015, Vinod Koul <vinod.koul@xxxxxxxxx> wrote: > On Tue, Oct 20, 2015 at 09:08:00AM +0100, Russell King - ARM Linux wrote: >> > > Currently i915/audio component works as you described. The audio is >> > > optional and HDMI graphics works without audio, while HDMI HD-audio >> > > mandates i915 graphics. >> > >> > Right, but we also add additional interface on top of this to allow >> > things like ensuring display is on when audio wants to run and now >> > notification for events. >> > >> > I don't see a reason why this can be used as single interface to bind as >> > well as talk to display from various components, unless I missed obvious >> > which prevent us from doing this in non i915 cases... >> >> Maybe I can comment more specifically if I saw the code. Right now all >> I'm aware of is this idea without any code, and I don't like it. > > Ok, i will be post my patches tomorrow. FWIW uses interface in > sound/hda/hdac_i915.c for display power up/down Side note, some of the Intel HD audio controller registers are in a power domain controlled by i915. The audio drivers needs to do power get/put, otherwise the audio driver loses its marbles when i915 switches off power. OTOH audio needs to be a good citizen so i915 can reach low power states. Just a shout from the back, unsure if this is relevant at this point... BR, Jani. -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
