generic: add support for BT2020

[CvH]

This adds the BT2020 patch for generic, we already carry that patch for RPi and afaik it was long term at the SMP HDR builds.

I have no HW to test it, @smp79 could you test it ?

[smp79]

This is not the correct patch.
IMO it would make sense to include xbmc/xbmc#21845 in LE 11.0. This does make the TV switch to BT2020 when playing HDR video on Intel HW.

[lrusak]

We shouldn't be adding functionality that doesn't exist outside vanilla Kodi.

Just because it's PR'd doesn't mean it's going to be merged.

[atoulmin]

This is not the correct patch.
IMO it would make sense to include xbmc/xbmc#21845 in LE 11.0. This does make the TV switch to BT2020 when playing HDR video on Intel HW.

Not that my opinion is worth much, but this should definitely be included.

[allixx]

The patch from the pull request won't apply on Nexus, it seems to be dependant on some other patch. It also only covers DRM Prime.

xbmc/xbmc#21845 this one works fine on Generic/GBM Intel; and while it is understandable that it is not a complete solution and doesn't cover all possible corner cases, imo it is better than nothing. If there is interest in test run results material, logs etc, I'm happy to provide it.