Re: [PATCH] drm/i915: Disable WaGsvRC0ResidencyMethod for vlv

[Deepak S <deepak.s@linux.intel.com>]

On Monday 13 April 2015 05:36 PM, Jani Nikula wrote:
> On Thu, 19 Mar 2015, Daniel Vetter <daniel@ffwll.ch> wrote:
>> On Thu, Mar 19, 2015 at 03:38:19PM +0200, David Weinehall wrote:
>>> On Thu, Mar 19, 2015 at 06:17:00PM +0530, Deepak S wrote:
>>>>
>>>> On Thursday 19 March 2015 05:14 PM, David Weinehall wrote:
>>>>> On Thu, Mar 19, 2015 at 04:09:44PM +0530, deepak.s@linux.intel.com wrote:
>>>>>> From: Deepak S <deepak.s@linux.intel.com>
>>>>>>
>>>>>> Unfortunately WaGsvRC0ResidencyMethod causing system freeze on some
>>>>>> of the baytrail systems :(. Switching back to legacy mode rps.
>>>>> Is there any way to identify either what systems it's OK to use on,
>>>>> or to identif what Baytrail systems it isn't OK to use on?
>>>>>
>>>>> Just reverting this completely seems overly broad if it's possible to
>>>>> tell the difference between working and non-working systems.
>>>> Restricting the changes to few system will be the right way to go.
>>>> How do we get details of now working system?
>>> That depends.  Who reported the non-working Baytrail-systems?
>>> And just as importantly, do we have Baytrail systems where this is
>>> confirmed to work?
>>>
>>> If we can identify the respective revisions of the systems
>>> we might be able to discern the pattern and continue from there.
>> My experience with random crashes with rps on snb/ivb is that there's no
>> solid systems, just systems where no one has bothered to be really evil
>> yet.
>>
>> I'd be really cautious with whitelisting since it tends to not really
>> solve the underlying bug (if there is one), usually blows up really fast
>> in size and is long-term unmaintainable. We've been there a few times with
>> other hacks and issues :(
> Plenty of talk but no final verdict on the patch either way, and the bug
> is still open too. :(
>
> Deepak, is this patch still needed?
>
> BR,
> Jani.

Hi Jani,

Chris has cleaned up patches for "WA for Turbo and RC6 to work" & these patches are helping to resolve freeze issue. We can ignore this patch. :)

Thanks
Deepak

>
>
>
>
>> -Daniel
>> -- 
>> Daniel Vetter
>> Software Engineer, Intel Corporation
>> http://blog.ffwll.ch
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