Re: [PATCH] drm/i915/chv: Use timeout mode for RC6 on chv

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

On Thursday 17 July 2014 09:16 AM, deepak.s@linux.intel.com wrote:
> From: Deepak S <deepak.s@linux.intel.com>
>
> Higher RC6 residency is observed using timeout mode
> instead of EI mode. It's Recommended to use TO Method for RC6.
>
> Signed-off-by: Deepak S <deepak.s@linux.intel.com>
> ---
>   drivers/gpu/drm/i915/intel_pm.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 19c5c26..88bad36 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4037,7 +4037,7 @@ static void cherryview_enable_rps(struct drm_device *dev)
>   		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
>   	I915_WRITE(GEN6_RC_SLEEP, 0);
>   
> -	I915_WRITE(GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */
> +	I915_WRITE(GEN6_RC6_THRESHOLD, 0x557);
>   
>   	/* allows RC6 residency counter to work */
>   	I915_WRITE(VLV_COUNTER_CONTROL,
> @@ -4053,7 +4053,7 @@ static void cherryview_enable_rps(struct drm_device *dev)
>   	/* 3: Enable RC6 */
>   	if ((intel_enable_rc6(dev) & INTEL_RC6_ENABLE) &&
>   						(pcbr >> VLV_PCBR_ADDR_SHIFT))
> -		rc6_mode = GEN6_RC_CTL_EI_MODE(1);
> +		rc6_mode = GEN7_RC_CTL_TO_MODE;
>   
>   	I915_WRITE(GEN6_RC_CONTROL, rc6_mode);
>   

Hi Ben,

Please review the patch

Thanks
Deepak