At Tue, 12 Mar 2013 16:05:26 +1000, Dave Airlie wrote: > > Hey guys, > > I've been writing dynamic power management code for the secondary > GPUs, however a lot of these GPUs have audio codecs as a subfunction > PCI device. > > So we get 01:00.0 as the GPU and 01:00.1 as the HDMI audio device. > > Now we have a single power switch for these devices, and generally the > power switch is hit when the ACPI entry to D3 is called for the GPU > and it shuts off the whole device. > > So the problem I'm having is how to have the audio device > (snd_hda_intel), understand that it needs to have the GPU devices D0 > called before it can do its own D0, and thats its D3 should be called > before the GPU drivers D3. > > Any pointers? Do I need to create a separate pm domain for these > devices? how does the ordering work then?
Implementing pm_domain in both graphics and audio drivers, graphics as a mater and audio a slave? Takashi
