i915: How to set the AVI InfoFrame on a HDMI output?

i915: How to set the AVI InfoFrame on a HDMI output?

[David Härdeman]

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?

-- 
David Härdeman

Re: i915: How to set the AVI InfoFrame on a HDMI output?

[Zhenyu Wang]

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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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Re: i915: How to set the AVI InfoFrame on a HDMI output?

[David Härdeman]

On Tue, July 27, 2010 03:41, Zhenyu Wang wrote:
> 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.

Thanks for the VIDEO_DIP_CTL/DATA pointer, I found the relevant passages
in the docs now (not sure why I didn't find it myself), it's in sections
2.8.8 and 2.8.9 of "Volume 3: Display Registers, Revision 1.0c".

The intel_audio_dump tool also seems to dump at least the VIDEO_DIP_CTL
part :)

-- 
David Härdeman