[Intel-gfx] [PATCH v5] drm/i915: pass ELD to HDMI/DP audio driver

[Wu Fengguang]

On Mon, Nov 14, 2011 at 05:45:12PM +0800, Takashi Iwai wrote:
> At Sat, 12 Nov 2011 10:27:26 +0800,
> Wu Fengguang wrote:
> > 
> > (snip)
> > > > > > > And I'm not sure whether HDMI audio is played
> > > > > > > while DPMS is off.  I haven't tested it.
> > > > > > 
> > > > > > It will go silence on DPMS. I noticed this while doing long term HDMI
> > > > > > audio playback tests.  This should better be fixed in future on the
> > > > > > graphics side.
> > > > > 
> > > > > Hm, but I wonder what could be done alternatively.
> > > > > Hopefully there is a register for video-only control...
> > > > 
> > > > There may be some mode that can keep video off while still keep
> > > > minimal signals to play HDMI sound?
> > > 
> > > Let's hope :)
> > 
> > Looks very possible, here is the clue of hardware support:
> > 
> >         TRANS_DP_CTL - Transcoder DisplayPort Control
> > 
> >         bit 26: Transcoder DP Audio Only Mode
> 
> Good to know!  But what about HDMI?

I'm not sure.. There are no corresponding TRANS_HDMI_CTL registers...

Thanks,
Fengguang