[Intel-gfx] [PATCH 1/1] drm/i915: Update Promotion timer for RC6 TO Mode

[O'Rourke, Tom]

This change looks good and is necessary, but the
commit message should have more detail.

I would add:
"When using RC6 timeout mode, the timeout value
should be written to GEN6_RC6_THRESHOLD."

With that,
Reviewed-by: Tom O'Rourke <Tom.O'Rourke at intel.com>

On Wed, Sep 23, 2015 at 03:06:42PM +0530, Sagar Arun Kamble wrote:
> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index a878147..ebde43d 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4842,7 +4842,6 @@ static void gen9_enable_rc6(struct drm_device *dev)
>  	for_each_ring(ring, dev_priv, unused)
>  		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
>  	I915_WRITE(GEN6_RC_SLEEP, 0);
> -	I915_WRITE(GEN6_RC6_THRESHOLD, 37500); /* 37.5/125ms per EI */
>  
>  	/* 2c: Program Coarse Power Gating Policies. */
>  	I915_WRITE(GEN9_MEDIA_PG_IDLE_HYSTERESIS, 25);
> @@ -4854,15 +4853,19 @@ static void gen9_enable_rc6(struct drm_device *dev)
>  	DRM_INFO("RC6 %s\n", (rc6_mask & GEN6_RC_CTL_RC6_ENABLE) ?
>  			"on" : "off");
>  
> +	/* WaRsUseTimeoutMode */
>  	if ((IS_SKYLAKE(dev) && INTEL_REVID(dev) <= SKL_REVID_D0) ||
> -	    (IS_BROXTON(dev) && INTEL_REVID(dev) <= BXT_REVID_A0))
> +	    (IS_BROXTON(dev) && INTEL_REVID(dev) <= BXT_REVID_A0)) {
> +		I915_WRITE(GEN6_RC6_THRESHOLD, 625); /* 800us */
>                  I915_WRITE(GEN6_RC_CONTROL, GEN6_RC_CTL_HW_ENABLE |
>                                  GEN7_RC_CTL_TO_MODE |
>                                  rc6_mask);
> -        else
> +	} else {
> +		I915_WRITE(GEN6_RC6_THRESHOLD, 37500); /* 37.5/125ms per EI */
>                  I915_WRITE(GEN6_RC_CONTROL, GEN6_RC_CTL_HW_ENABLE |
>                                  GEN6_RC_CTL_EI_MODE(1) |
>                                  rc6_mask);
> +	}
>  
>  	/*
>  	 * 3b: Enable Coarse Power Gating only when RC6 is enabled.
> -- 
> 1.9.1
> 
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