[Intel-gfx] [PATCH] drm/i915/ringbuffer: set force wake bit before reading ring register

[Chris Wilson]

On Tue, 9 Nov 2010 17:17:07 +0800, "Zou, Nanhai" <nanhai.zou at intel.com> wrote:
 
> I have tested this patch with the read ring head from status page workaround patch reverted.
> Seems it works on my SNB box.

I needed to add a udelay(100) to i915_safe_read for my rev 8. Can you
check if there is a recommended delay for FORCEWAKE?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre