[Intel-gfx] [PATCH] drm/i915/skl: Use correct use counters for force wakes

[Chris Wilson]

On Tue, Sep 30, 2014 at 03:08:02PM +0100, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Write and reads following the block changed use engine specific use counters
> and unless that is matched here force wake use counting goes bad. Same
> force wake is attempted to be taken twice which leads to at least time outs.
> 
> NOTE: Depending on feedback from hardware designers it may not be necessary
> to grab force wakes on Gen9 here. But for Gen8 it is needed due to a race
> between RC6 and ELSP writes.
> 
> v2: Added blitter force wake engine and made more future proof.
>     Added commit note.

Speaking of futureproofing, what did you think of my patch to remove the
duplicated counting logic?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre