[Intel-gfx] [PATCH 2/7] drm/i915: implement a media hang w/a

[Ben Widawsky]

On Sat, Mar 31, 2012 at 11:21:58AM +0200, Daniel Vetter wrote:
> Contrary to the other clock gating w/a in GEN6_UCGCTL1, this one is
> actually documented in Bspec, vol1g "GT Interface Registers [SNB]",
> Section 1.5.1 "UCGCTL1 - Unit Level Clock Gating Control 1".
> 
> Supposedly this can prevent hangs on the media ring.
> 
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---

According to my bspec, this is IVB A0 only. ie. nobody should ever need
this.