[Bug 111572] Changing the "Broadcast RGB" property does not update the AVI InfoFrame

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111572

--- Comment #5 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Lakshmi from comment #4)
> (In reply to Ville Syrjala from comment #3)
> > (In reply to Hans Verkuil from comment #2)
> > > Created attachment 145322 [details]
> > > Log with drm.debug=0x1e when setting Broadcast RGB
> > > 
> > > Attached is prop.log. I added a pr_info in
> > > intel_digital_connector_atomic_set_property() when the Broadcast RGB
> > > property changes ("HV: set broadcast_rgb to 1").
> > > 
> > > Note that I'm testing on an Intel NUC7i5BNB where DP-1 is a DP-to-HDMI
> > > branch device (MegaChips 2800). So it is not a native HDMI device.
> > > 
> > > I'm happy to test more if needed.
> > 
> > Ah LSPCON. Yeah that's probably borked because we have no readout and hence
> > the infoframe state checker isn't hooked up either, and so the code doesn't
> > realize it needs a full modeset to update the infoframe. Not the only
> > problem in the LSPCON code unfortunately.
> 
> Swati/Shshank, Latest/upcoming FW will help here?

Firmware is no help here. The code needs to:
- precompute the infoframes properly
- read out the infoframe so that the state checker will work
- add a mechanims by which we can disable the infoframe (because I suspect
currnely it's sending infoframes to DVI sinks)

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