[Mesa-dev] [PATCH] i965: Fix incorrect maximum PS thread count shift on Ivybridge.

Eric Anholt eric at anholt.net
Sat Sep 24 11:42:13 PDT 2011

On Fri, 23 Sep 2011 23:45:54 -0700, Kenneth Graunke <kenneth at whitecape.org> wrote:
> I mistakenly set GEN7_PS_MAX_THREAD_SHIFT to 23; it's actually 24 on
> Ivybridge.  Not only did this halve our thread count, it caused us to
> write 1 into a bit 23, which is marked as MBZ (must be zero).
> Furthermore, it made us write an even number into this field, which is
> apparently not allowed.  Apparently we were just lucky it worked.
> NOTE: This is a candidate for the 7.11 branch.

You weren't mistaken -- the docs said 23 at one point.  The updated 24
looks correct, though.

Reviewed-by: Eric Anholt <eric at anholt.net>
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