Can you perhaps elaborate in detail what have you tried so far? And supplying all the logs.
If feature works on hardware and with their legacy kernel, this doesn't mean it works elsewhere right away. We ditched old and security highly problematic legacy code long time ago. But the price is that not all functions work yet.
Here its not mentioned https://linux-meson.com/mainlining.html# and I don't recall if we have this working or not.
