I fixed the url.
You mean how I merged? I made a patch from the below commits and applied it to current master. Required some tinkering as they don't apply cleanly anymore.
WIP: DVDVideoCodecDRMPRIME: add support for vaapi decoding · lrusak/xbmc@b92f7b4 · GitHub
DRMPRIME: add support for descriptor with multiple layers · lrusak/xbmc@73d8a98 · GitHub
CVideoLayerBridgeDRMPRIME add colourspace connector property · lrusak/xbmc@e47cf6a · GitHub
VideoBufferDMA: set desc->format also · lrusak/xbmc@269eabb · GitHub
[WIP] check descriptor for format also · lrusak/xbmc@f16856a · GitHub
VideoPlayer: CRenderManager: improve logging of renderer being used · lrusak/xbmc@4d7ab30 · GitHub
ffmpeg changes:
ffmpeg: generic drm-prime support · smp79/LibreELEC.tv@90a8770 · GitHub
ffmpeg: Generic-GBM drm-prime vaapi support patch · smp79/LibreELEC.tv@07ac2d2 · GitHub