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

[Zou, Nanhai]

>>-----Original Message-----
>>From: Chris Wilson [mailto:chris at chris-wilson.co.uk]
>>Sent: 2010年11月9日 18:50
>>To: Zou, Nanhai; intel-gfx at lists.freedesktop.org; Zhao, Jian J
>>Subject: RE: [PATCH] drm/i915/ringbuffer: set force wake bit before reading
>>ring register
>>
>>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
>>
Dose a post read to FORCEWAKE help?

Thanks
Zou Nanhai

>>--
>>Chris Wilson, Intel Open Source Technology Centre