[Intel-gfx] [PATCH 3/8] drm/i915/gen9: Add HDC_CHICKEN1 to HW whitelist

[Nick Hoath]

On 13/01/2016 10:06, Arun Siluvery wrote:
> Required for WaAllowUMDToModifyHDCChicken1:skl,bxt
>
> Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>

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

> ---
>   drivers/gpu/drm/i915/i915_reg.h         | 2 ++
>   drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++++
>   2 files changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 1067ff0..16ef377 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6045,6 +6045,8 @@ enum skl_disp_power_wells {
>   #define  HDC_FORCE_NON_COHERENT			(1<<4)
>   #define  HDC_BARRIER_PERFORMANCE_DISABLE	(1<<10)
>
> +#define GEN8_HDC_CHICKEN1			_MMIO(0x7304)
> +
>   /* GEN9 chicken */
>   #define SLICE_ECO_CHICKEN0			_MMIO(0x7308)
>   #define   PIXEL_MASK_CAMMING_DISABLE		(1 << 14)
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 35e78ed..2241a92 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -985,6 +985,11 @@ static int gen9_init_workarounds(struct intel_engine_cs *ring)
>   	if (ret)
>   		return ret;
>
> +	/* WaAllowUMDToModifyHDCChicken1:skl,bxt */
> +	ret = wa_ring_whitelist_reg(ring, GEN8_HDC_CHICKEN1);
> +	if (ret)
> +		return ret;
> +
>   	return 0;
>   }
>
>