[Intel-gfx] [PATCH 5/8] drm/i915/bxt: Add GEN8_L3SQCREG4 to HW whitelist

[Nick Hoath]

On 13/01/2016 10:06, Arun Siluvery wrote:
> Required for WaDisableLSQCROPERFforOCL:bxt
>
> According to WA database these are only applicable for BXT:A0 but since
> A0 and A1 shares the same GT these are extended for A1 as well.
>
> Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>

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

> ---
>   drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 7a46cf1..5eb4eea 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -1135,10 +1135,15 @@ static int bxt_init_workarounds(struct intel_engine_cs *ring)
>   	/* WaDisableObjectLevelPreemptionForTrifanOrPolygon:bxt */
>   	/* WaDisableObjectLevelPreemptionForInstancedDraw:bxt */
>   	/* WaDisableObjectLevelPreemtionForInstanceId:bxt */
> +	/* WaDisableLSQCROPERFforOCL:bxt */
>   	if (IS_BXT_REVID(dev, 0, BXT_REVID_A1)) {
>   		ret = wa_ring_whitelist_reg(ring, GEN9_CS_DEBUG_MODE1);
>   		if (ret)
>   			return ret;
> +
> +		ret = wa_ring_whitelist_reg(ring, GEN8_L3SQCREG4);
> +		if (ret)
> +			return ret;
>   	}
>
>   	return 0;
>