[Intel-gfx] [PATCH] drm/i915/vlv: drop punit freq staus read after setting idle

[S, Deepak]

On 6/13/2014 12:10 AM, Ville Syrjälä wrote:
> On Thu, Jun 12, 2014 at 11:45:03PM +0530, S, Deepak wrote:
>>   >> I was polling VLV_GTLC_SURVIVABILITY_REG and VLV_GTLC_PW_STATUS to make
>>   >> sure both render and media wells and the gfx clock remain off, and I
>>   >> was also monitoring vnn via svid. While that was going on I just rewrote
>>   >> PUNIT_REG_GPU_FREQ_REQ to make Punit change the frequency, and sure
>>   >> enough it did, and svid showed me that vnn had also changed. So it
>>   >> appears there's no need to have the gfx clock on to change its frequency
>>   >> on this BYT.
>>   >>
>>   >> I wonder if this part of the workaround was only needed on older parts.
>>   >> Deepak, any ideas?
>>   >
>>   > Yes ville, this was added initial for older parts and force gfx clock
>>   > was part of the workaround.
>>   > We have not verified this on newer parts. Let me check with hw guys to
>>   > see if workaround still exits and when this was fixed.
>>
>> Hi Ville, Got the confirmation from HW team, this WA as been fixed in
>> latest stepping,
>
> What's latest here? Did we ever ship any of the steppings that still
> need the gfx clock force?
>
>> we can remove the force gfx clock, mask and request
>> only the min freq when we are idle.
>>
>> You will submit patch will fix or you want me to do it?
>
> Go ahead if you have time. I'm already juggling too many things :)
Ok. I will send the patch for review :)