DERRMR is documented in vlv bspec. 

Regards,
Chon Ming

On Sep 4, 2013, at 5:42 PM, "Daniel Vetter" <dan...@ffwll.ch> wrote:

> On Wed, Sep 4, 2013 at 11:28 AM, Lee, Chon Ming <chon.ming....@intel.com> 
> wrote:
>> This patch causes VLV hang, look like ring buffer lockup.
>> 
>> This is the message.
>> [drm] stuck on render ring
>> 
>> I haven't  look at the bspec for the different between VLV and Ivybridge on 
>> this
>> yet.  Just see anyone have any clue why this might fail in VLV.
> 
> I guess there's no DERRMR register on vlv? If that's the case I think
> we just need to disable rcs flips on vlv.
> -Daniel
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
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