Scanline wait hack for IVB

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On Fri, 30 Mar 2012 13:30:17 -0700
Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> You need to set DE_RRMR (offset 0x44050) to unmask scanline waits, but
> this at least doesn't hang on my IVB.
> 
> However I still see tearing on my config, need to verify the pipe and
> inclusive/exclusive setting.

So it looks like we can't use this on the BLT ring in SNB or IVB.  So
we'll need a render ring BLT routine to use here instead (hello SNA).

-- 
Jesse Barnes, Intel Open Source Technology Center
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