Re: [PATCH 15/18] drm/i915/skl: Implement WaDisableHDCInvalidation

[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_reg.h | 1 +
>   drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
>   2 files changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 3ae7a09..b363c5e 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -140,6 +140,7 @@
>   #define GEN8_RING_PDP_LDW(ring, n)	((ring)->mmio_base+0x270 + (n) * 8)
>
>   #define GAM_ECOCHK			0x4090
> +#define   BDW_DISABLE_HDC_INVALIDATION	(1<<25)
>   #define   ECOCHK_SNB_BIT		(1<<10)
>   #define   HSW_ECOCHK_ARB_PRIO_SOL	(1<<6)
>   #define   ECOCHK_PPGTT_CACHE64B		(0x3<<3)
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index f53ef11..8f9149b 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -81,6 +81,12 @@ static void skl_init_clock_gating(struct drm_device *dev)
>   			   GEN6_VFUNIT_CLOCK_GATE_DISABLE);
>   	}
>
> +	if (INTEL_REVID(dev) <= SKL_REVID_D0)
> +		/* WaDisableHDCInvalidation:skl */
> +		I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) |
> +			   BDW_DISABLE_HDC_INVALIDATION);
> +
> +
>   	if (INTEL_REVID(dev) <= SKL_REVID_E0)
>   		/* WaDisableLSQCROPERFforOCL:skl */
>   		I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
>

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