[Intel-gfx] Ivybridge hang fixes respun

[Eugeni Dodonov]

On Wed, Feb 8, 2012 at 18:53, Kenneth Graunke <kenneth at whitecape.org> wrote:

> These fix many GPU hangs for Eugeni, though not on my machine for some
> reason.
>
> Oddly, the register writes to UCGCTL2 and SQ_CHICKEN_MBCUNIT_CONFIG stick,
> but the writes to L3_CHICKEN_MODE, L3CNTLREG1, and COMMON_SLICE_CHICKEN1
> don't seem to take effect.  Currently no theories why.
>
> Manually writing these values with intel_reg_write /does/ fix the hangs
> for me.
>
> I'm fine with these going to -fixes.  They seem to help some people, and
> I highly doubt they'll make anything worse.  It'd be nice to understand
> why the register writes aren't sticking, though...
>

Complementing Ken's mail, Li Bo from our QA team has did a full round of
tests with these patches on IVB and all known issues were gone apparently.

Keith, Jesse - I think they are good -fixes candidates at this point.

-- 
Eugeni Dodonov
<http://eugeni.dodonov.net/>
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