Re: [PATCH 09/12] drm/i915/skl: Remove WaSetGAPSunitClckGateDisable

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

On Fri, Sep 25, 2015 at 02:33:43PM +0100, Arun Siluvery wrote:
> Dropping it because it is for pre-production stepping, also removed
> bit definition in i915_reg as it is not used anywhere else.
> 
> Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h | 1 -
>  drivers/gpu/drm/i915/intel_pm.c | 6 ------
>  2 files changed, 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 085ffa2..ef3d71f 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6705,7 +6705,6 @@ enum skl_disp_power_wells {
>  #define GEN6_RSTCTL				0x9420
>  
>  #define GEN8_UCGCTL6				0x9430
> -#define   GEN8_GAPSUNIT_CLOCK_GATE_DISABLE	(1<<24)
>  #define   GEN8_SDEUNIT_CLOCK_GATE_DISABLE	(1<<14)
>  #define   GEN8_HDCUNIT_CLOCK_GATE_DISABLE_HDCREQ (1<<28)

I would keep the bit define.

> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index a6ee0d3..65c60bc 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -76,12 +76,6 @@ static void skl_init_clock_gating(struct drm_device *dev)
>  	gen9_init_clock_gating(dev);
>  
>  	if (INTEL_REVID(dev) <= SKL_REVID_B0) {
> -		/*
> -		 * WaSetGAPSunitClckGateDisable:skl
> -		 */
> -		I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
> -			   GEN8_GAPSUNIT_CLOCK_GATE_DISABLE);
> -

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

But again BSpec is confused. It says BXT until B0 would also need this,
whereas w/a db doesn't have it fot BXT.

>  		/* WaDisableVFUnitClockGating:skl */
>  		I915_WRITE(GEN6_UCGCTL2, I915_READ(GEN6_UCGCTL2) |
>  			   GEN6_VFUNIT_CLOCK_GATE_DISABLE);
> -- 
> 1.9.1
> 
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-- 
Ville Syrjälä
Intel OTC
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