[Intel-gfx] i915: How to set the AVI InfoFrame on a HDMI output?

Zhenyu Wang zhenyuw at linux.intel.com
Tue Jul 27 03:41:56 CEST 2010

On 2010.07.26 20:36:49 +0200, David Härdeman wrote:
> Hi,
> I'm trying to play with some different AVI InfoFrame settings for the 
> HDMI output on my DG45FC (G45 Intel graphics hardware, HDMI connector on 
> the motherboard) but I can't seem to find any references to it in the 
> i915 driver or in the programming specs.
> drivers/gpu/drm/i915/intel_sdvo.c has code for setting an avi infoframe 
> for hdmi outputs, but it doesn't seem to be used on my board (I tried 
> sprinkling some printk's in there). I guess it's only for ADD2 type 
> addon boards?
> So far I'm guessing that drivers/gpu/drm/i915/intel_hdmi.c is 
> responsible but there is no code in there that deals with the avi 
> infoframe and I haven't been able to find anything in the programming 
> manuals from the intel linux graphics website.
> Could anyone point me in the right direction?
> And on a related note, does anyone know if the hardware supports HDMI 
> CEC and where I might find the relevant hardware documentation?

We don't have AVI infoframe support for native HDMI port now.
Looks our public doc missed register info for VIDEO_DIP_CTL/DATA,
that I assume should be used for that. If you have requirement to
support that maybe for some special sink device, I can try to ask
if that info should be updated in the spec.

Open Source Technology Center, Intel ltd.

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