[Intel-gfx] [PATCH] drm/i915: Support Async Flip on Linear buffers

[Murthy, Arun R]

> > > It's supported earlier than that. But IIRC there was some kind of
> > > GTT alignment vs. async flip vs. FBC restriction that we weren't handling.
> > >
> > Should I enable it for earlier Gen also, or is it fine to keep it with starting
> Gen 12.
> > The only restriction that I see in Bspec is that during async flip
> > changes to stride, pixel format, compression, FBC etc is not allowed
> > and I see this is already taken care of. Am I missing anything?
> 
> There is that GTT alignment restriction that should be mentioned
> somewhere. Can't quite remember where it was, maybe in PLANE_SURF.
> 
I checked the BSpec, and don't find anything as such specific for Async flip.
I also cross verified with the hardware team.

> But I guess the bigger question is what is the actual use case for this?
This feature is a requirement for LNL.

Thanks and Regards,
Arun R Murthy
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