[alsa-devel] HDMI hotplug on Skylake when power well is off

[Vinod Koul]

On Wed, Jul 15, 2015 at 12:59:02PM +0200, Takashi Iwai wrote:
> On Wed, 15 Jul 2015 11:05:22 +0200,
> David Henningsson wrote:
> > 
> > Hi,
> > 
> > I'm trying to debug an issue here where the HDMI hotplug events are not 
> > delivered to the audio side when the power well is off. This is on a 
> > Skylake machine (running in HDA mode).
> > 
> > I'm not sure whether the problem is upstream or due to my own patches 
> > while testing, so I was wondering how this is supposed to be working, so 
> > I can troubleshoot further?
> > 
> > Should there be an IRQ on the HDA controller even if the power well is 
> > off, and if not, how should the audio driver be notified that an HDMI 
> > hotplug event has happened?
> 
> I thought this has been always a problem when the runtime PM is
> enabled, no matter whether the power well state is.
Shouldn't the hotplug action turn on the power well? Then notification for
audio side should get propagated as power well is On

> 
> IMO, a cleaner solution would be rather the notifier implementation in
> software, e.g. extend the i915 component to pass the audio side ops
> for notification.
Yes that should be added but I would prefer we have hw do that as well

-- 
~Vinod