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

[Takashi Iwai]

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.

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.


Takashi