Re: [PATCH 14/20] drm/i915: add media well to VLV force wake routines v2

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Fri, Mar 08, 2013 at 10:45:57AM -0800, Jesse Barnes wrote:
> We could split this out into a separate routine at some point as an
> optimization.
> 
> v2: use FORCEWAKE_KERNEL (Ville)
> 
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

With the understanding that no one gets to blame me if the magic
same cacheline register trick turns out to be necessary after all ;)

> ---
>  drivers/gpu/drm/i915/i915_reg.h |    2 ++
>  drivers/gpu/drm/i915/intel_pm.c |   12 +++++++++---
>  2 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 1877d0e..07a1333 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4266,6 +4266,8 @@
>  #define  FORCEWAKE				0xA18C
>  #define  FORCEWAKE_VLV				0x1300b0
>  #define  FORCEWAKE_ACK_VLV			0x1300b4
> +#define  FORCEWAKE_MEDIA_VLV			0x1300b8
> +#define  FORCEWAKE_ACK_MEDIA_VLV		0x1300bc
>  #define  FORCEWAKE_ACK_HSW			0x130044
>  #define  FORCEWAKE_ACK				0x130090
>  #define  VLV_GTLC_WAKE_CTRL			0x130090
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d2499eb..70eab45 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4415,10 +4415,16 @@ static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
>  		DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
>  
>  	I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
> +	I915_WRITE_NOTRACE(FORCEWAKE_MEDIA_VLV, _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
>  
>  	if (wait_for_atomic((I915_READ_NOTRACE(FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL),
>  			    FORCEWAKE_ACK_TIMEOUT_MS))
> -		DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
> +		DRM_ERROR("Timed out waiting for GT to ack forcewake request.\n");
> +
> +	if (wait_for_atomic((I915_READ_NOTRACE(FORCEWAKE_ACK_MEDIA_VLV) &
> +			     FORCEWAKE_KERNEL),
> +			    FORCEWAKE_ACK_TIMEOUT_MS))
> +		DRM_ERROR("Timed out waiting for media to ack forcewake request.\n");
>  
>  	__gen6_gt_wait_for_thread_c0(dev_priv);
>  }
> @@ -4426,8 +4432,8 @@ static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
>  static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
>  {
>  	I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
> -	/* something from same cacheline, but !FORCEWAKE_VLV */
> -	POSTING_READ(FORCEWAKE_ACK_VLV);
> +	I915_WRITE_NOTRACE(FORCEWAKE_MEDIA_VLV, _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
> +	/* The below doubles as a POSTING_READ */
>  	gen6_gt_check_fifodbg(dev_priv);
>  }
>  
> -- 
> 1.7.10.4
> 
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-- 
Ville Syrjälä
Intel OTC