[Intel-gfx] [RFC] Async flips

[Eric Anholt]

Ville Syrjälä <ville.syrjala at linux.intel.com> writes:

> On Tue, Oct 30, 2012 at 01:33:47PM -0500, Jesse Barnes wrote:
>> The hw supports async flips through the render ring, so why not expose it?
>> It gives us one more "tear me harder" option we can use in the DDX and
>> for other cases where simply flipping to the latest buffer is more
>> important than visual quality.
>
> The only reason I can see why anyone would really want async flips is
> when you're restricted to double buffering. With triple buffering you
> should be able to override the previous flip w/o tearing.
>
> Well, actually if you use the ring based flips, then you can't do the
> override. My atomic page flip code can do it because it's using mmio
> flips. There were also other reasons favoring mmio over ring.
>
> Once the atomic code is deemed ready, I would suggest we just nuke the
> ring based flip code (pun intended).

Can you outline what exactly your plan is for doing faster-than-vblank
page flipping without tearing, and how it gets synchronized with
rendering?
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