[Intel-gfx] HDMI 4k modes VIC

Sharma, Shashank shashank.sharma at intel.com
Thu Oct 29 08:06:53 PDT 2015

Thanks for the suggestion. I will check with Thierrey also.


-----Original Message-----
From: Ville Syrjälä [mailto:ville.syrjala at linux.intel.com] 
Sent: Thursday, October 29, 2015 6:48 PM
To: Sharma, Shashank
Cc: Lespiau, Damien; Jani Nikula; intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org; Thierry Reding
Subject: Re: [Intel-gfx] HDMI 4k modes VIC

On Thu, Oct 29, 2015 at 08:03:29AM +0000, Sharma, Shashank wrote:
> Actually we should update the cea_modedb in drm layer with 4k modes 
> and appropriate VIC, coz the AVI infoframe functions are not getting proper VICs for cea modes. Or while processing alternative cea modes, we should check and return VICs.

That's not surprising since the drm mode lists haven't been updated for 861-F.
IIRC Thierry may already have some patches for that, as well as HDMI 2.0.

> I was planning to add 4k at 60 modes, I will probably add one patch there, for handling the 4k modes in CEA db. 
> As per CEA-861-F compliance, the 4k at 30 and 4k at 60 modes can come in cea DB as SVD modes. So we should have VICs for them also. 
> We will also start upstreaming the patches we added for VLV/CHV, for handling aspect ratio support in libdrm layer as well as kernel. 
> Regards
> Shashank
> -----Original Message-----
> From: Lespiau, Damien
> Sent: Wednesday, October 28, 2015 10:21 PM
> To: Jani Nikula
> Cc: Sharma, Shashank; intel-gfx at lists.freedesktop.org
> Subject: Re: [Intel-gfx] HDMI 4k modes VIC
> On Wed, Oct 28, 2015 at 06:38:21PM +0200, Jani Nikula wrote:
> > > Are you seeing a bug? it's totally possible, I've never used an 
> > > actual conformance tool when I wrote that code, so it's likely 
> > > buggy and the VIC in the AVI infoframe may well be wrong.
> > 
> > Possibly relevant
> > https://bugs.freedesktop.org/show_bug.cgi?id=92217
> That one looks different, we don't do aspect ratio on modes very well, not even exposing them to user space.
> --
> Damien
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> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
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Ville Syrjälä
Intel OTC

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