[Bug 76176] [BYT] Page flip doesn't change tiling mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76176

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #11)
> (In reply to comment #10)
> > I guess Chris can tilt at this windmill. :)
> > 
> > Another thing I don't think I tried is to write the tile reg and surf reg
> > *after* the flip in the CS.  Writing it before didn't seem to work, probably
> > because the tile bit got clobbered by the message from the GT side.  But
> > writing it after, while racy, might work.
> 
> Yeah mean with LRI? AFAIK LRIs targeting display registers end up in
> /dev/null on byt.

Yes. All we need to do is to make sure we do actually engage the mmio flip.
Sadly the same applies for #77104

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