[PATCH] drm/i915: paper over missed irq issues with force wake vodoo

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On Sat, 14 Jan 2012 00:52:31 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:

> - I think we need to amend the commit msg of the voodoo patch with the
>   piece of doc I've discovered. If you want I can send out a v3 with that.

Sounds good.

> - I think the HWSTAM revert is material for -next

I'd be OK with pushing all of the SNB changes to -next and leaving the
patches only affecting IVB, where we know it is necessary.

Note that this branch wasn't written with an eye to merging to -fixes,
but rather as what we want the code to look like eventually. As such, we
need to identify separately

 1) What needs to go into -fixes for 3.3.

 2) What needs to go into -next for 3.4.

> - Can you post your 3 patches on intel-gfx, I think I can shoot at them a
>   bit ;-)

Sure; it's all a work in progress.

> acc101d drm/i915: Hold gt_lock across forcewake register reads
> 
> Imo this is a simple cleanup (reading forcewake-protected registers isn't
> really a fast-path for us), so material for -next.

The 'optimization' is just a side benefit. The fix is to prevent reads

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