Re: [PATCH v3 1/1] drm/i915: Update Promotion timer for RC6 TO Mode

From: "O'Rourke, Tom" <Tom.O'Rourke@intel.com>
To: "Kamble, Sagar A" <sagar.a.kamble@intel.com>
Cc: "intel-gfx@lists.freedesktop.org" <intel-gfx@lists.freedesktop.org>
Subject: Re: [PATCH v3 1/1] drm/i915: Update Promotion timer for RC6 TO Mode
Date: Mon, 5 Oct 2015 09:29:06 -0700	[thread overview]
Message-ID: <20151005162906.GA19180@torourke-desk1> (raw)
In-Reply-To: <1443711567-6510-1-git-send-email-sagar.a.kamble@intel.com>

On Thu, Oct 01, 2015 at 07:59:27AM -0700, Kamble, Sagar A wrote:
> When using RC6 timeout mode, the timeout value
> should be written to GEN6_RC6_THRESHOLD.
> 
> v2: Updated commit message. (Tom)
> 
> v3: Rebase over whitespace differences. (Daniel)
> 
> Cc: Tom O'Rourke <Tom.O'Rourke@intel.com>
> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
[TOR:] Still looks good.

Reviewed-by: Tom O'Rourke <Tom.O'Rourke@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_pm.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index c98eee6..c16f496 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4791,7 +4791,6 @@ static void gen9_enable_rc6(struct drm_device *dev)
>  		I915_WRITE(GUC_MAX_IDLE_COUNT, 0xA);
>  
>  	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);
> @@ -4802,16 +4801,19 @@ static void gen9_enable_rc6(struct drm_device *dev)
>  		rc6_mask = GEN6_RC_CTL_RC6_ENABLE;
>  	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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