[Intel-gfx] [PATCH 2/5] drm/i915/bxt: WaGsvDisableTurbo

[Kamble, Sagar A]

Hi Tom, Akash

Kindly review this patch.

Thanks
Sagar


On 9/11/2015 11:53 AM, Kamble, Sagar A wrote:
> Gentle reminder for review.
>
> Thanks
> Sagar
>
> On 8/23/2015 5:52 PM, Sagar Arun Kamble wrote:
>> Disable Turbo on steppings prior to B0 on BXT due to hangs seen 
>> during GT CPD exit.
>>
>> Change-Id: I50c5c03f59f5ba092db19e17234951d89db42c6c
>> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_pm.c 
>> b/drivers/gpu/drm/i915/intel_pm.c
>> index fff0c22..75f1c8c 100644
>> --- a/drivers/gpu/drm/i915/intel_pm.c
>> +++ b/drivers/gpu/drm/i915/intel_pm.c
>> @@ -4450,6 +4450,10 @@ static void gen6_set_rps(struct drm_device 
>> *dev, u8 val)
>>   {
>>       struct drm_i915_private *dev_priv = dev->dev_private;
>>   +    /* WaGsvDisableTurbo: Workaround to disable turbo on BXT A* */
>> +    if (IS_BROXTON(dev) && (INTEL_REVID(dev) < BXT_REVID_B0))
>> +        return;
>> +
>>       WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
>>       WARN_ON(val > dev_priv->rps.max_freq);
>>       WARN_ON(val < dev_priv->rps.min_freq);
>> @@ -4770,6 +4774,12 @@ static void gen9_enable_rps(struct drm_device 
>> *dev)
>>         gen6_init_rps_frequencies(dev);
>>   +    /* WaGsvDisableTurbo: Workaround to disable turbo on BXT A* */
>> +    if (IS_BROXTON(dev) && (INTEL_REVID(dev) < BXT_REVID_B0)) {
>> +        intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
>> +        return;
>> +    }
>> +
>>       /* Program defaults and thresholds for RPS*/
>>       I915_WRITE(GEN6_RC_VIDEO_FREQ,
>>           GEN9_FREQUENCY(dev_priv->rps.rp1_freq));
>
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