[PATCH] drm/edid: add non-desktop quirk to Bigscreen Beyond HMD

[Jani Nikula]

On Fri, 17 May 2024, Sefa Eyeoglu <contact at scrumplex.net> wrote:
> On Fri, 2024-05-17 at 16:52 +0200, Philipp Zabel wrote:
>> On Fr, 2024-05-17 at 16:09 +0200, Sefa Eyeoglu wrote:
>> > The Bigscreen Beyond VR headset is a non-desktop output and should
>> > be
>> > marked as such using an EDID quirk.
>> > 
>> > Closes https://gitlab.freedesktop.org/drm/misc/kernel/-/issues/39
>> 
>> From the EDID posted there, it looks like the quirk should not be
>> necessary?
>> 
>> The quoted DisplayID extension block correctly marks this as an HMD:
>> 
>>   "Display Product Primary Use Case: Head-mounted Virtual Reality
>> (VR) display"
>> 
>> The update_displayid_info() function in drm_edid.c should use this
>> information to set the non_desktop flag already. Doesn't this work as
>> expected?
>> 
>> 
>> regards
>> Philipp
>
> I see.
>
> The only potential reason I can come up with is that the DisplayID
> block is incomplete.
>
> $ edid-decode --check
> Failures:
>
> Block 0, Base EDID:
>   Standard Timings: Missing preferred timing.
> EDID:
>   DisplayID: Missing DisplayID Product Identification Data Block.
>   DisplayID: Missing DisplayID Display Parameters Data Block.
>   DisplayID: Missing DisplayID Display Interface Features Data Block.
>
> EDID conformity: FAIL

I've commented on the bug, but I don't think these should matter. We
should be able to deduce the primary use from the DisplayID header.

BR,
Jani.



-- 
Jani Nikula, Intel