[Intel-gfx] [PATCH] drm/i915: add multi-threaded forcewake support

[Keith Packard]

On Fri, 18 Nov 2011 14:48:39 -0800, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> So the ECOBUS reg *is* in the GT power well.  Which means in order to
> read it we have to disable RC6 altogether, forcibly, using the 0xa090
> reg, set up force wake, then re-enable RC6.

Not surprising the ECOBUS is in the well; we really only need to read it
when rc6 is getting set up, so it'll be disabled at that point.

But, unless I'm confused, ECOBUS doesn't have any useful information in
it anyways:

# intel_reg_read 0xa090
0xA090 : 0x0
# intel_reg_read 0xa080
0xA080 : 0x0

-- 
keith.packard at intel.com
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