Re: [PATCH 14/18] drm/i915/skl: Implement WaDisableLSQCROPERFforOCL

[Nick Hoath <nicholas.hoath@intel.com>]

On 09/02/2015 19:33, Damien Lespiau wrote:
> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>

> ---
>   drivers/gpu/drm/i915/i915_drv.h | 1 +
>   drivers/gpu/drm/i915/i915_reg.h | 3 +++
>   drivers/gpu/drm/i915/intel_pm.c | 5 +++++
>   3 files changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index c0b8644..0765bd1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2391,6 +2391,7 @@ struct drm_i915_cmd_table {
>   #define SKL_REVID_B0		(0x1)
>   #define SKL_REVID_C0		(0x2)
>   #define SKL_REVID_D0		(0x3)
> +#define SKL_REVID_E0		(0x4)
>
>   /*
>    * The genX designation typically refers to the render engine, so render
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index d519ed9..3ae7a09 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5264,6 +5264,9 @@ enum skl_disp_power_wells {
>   #define GEN7_L3SQCREG4				0xb034
>   #define  L3SQ_URB_READ_CAM_MATCH_DISABLE	(1<<27)
>
> +#define GEN8_L3SQCREG4				0xb118
> +#define  GEN8_LQSC_RO_PERF_DIS			(1<<27)
> +
>   /* GEN8 chicken */
>   #define HDC_CHICKEN0				0x7300
>   #define  HDC_FORCE_NON_COHERENT			(1<<4)
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index ff4e289..f53ef11 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -80,6 +80,11 @@ static void skl_init_clock_gating(struct drm_device *dev)
>   		I915_WRITE(GEN6_UCGCTL2, I915_READ(GEN6_UCGCTL2) |
>   			   GEN6_VFUNIT_CLOCK_GATE_DISABLE);
>   	}
> +
> +	if (INTEL_REVID(dev) <= SKL_REVID_E0)
> +		/* WaDisableLSQCROPERFforOCL:skl */
> +		I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
> +			   GEN8_LQSC_RO_PERF_DIS);
>   }
>
>   static void i915_pineview_get_mem_freq(struct drm_device *dev)
>

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