[Intel-gfx] [PATCH] drm/i915/mtl: Disable SF round to nearest even

[Matt Roper]

On Wed, Aug 09, 2023 at 12:10:43PM +0530, Shekhar Chauhan wrote:
> Workaround for disabling round to nearest even in the SF unit.

I don't think we want/need this workaround in i915 (see the explanation
I just gave on the Xe patch for the same workaround).  However we do
need to _drop_ the implementation of this workaround that we already
have for DG2.


Matt

> 
> BSpec: 45818
> Signed-off-by: Shekhar Chauhan <shekhar.chauhan at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 01807a7dd2c1..f233a552539b 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -850,6 +850,9 @@ static void mtl_ctx_workarounds_init(struct intel_engine_cs *engine,
>  
>  	/* Wa_18019271663 */
>  	wa_masked_en(wal, CACHE_MODE_1, MSAA_OPTIMIZATION_REDUC_DISABLE);
> +
> +	/* Wa_15010599737 */
> +	wa_mcr_masked_en(wal, CHICKEN_RASTER_1, DIS_SF_ROUND_NEAREST_EVEN);
>  }
>  
>  static void fakewa_disable_nestedbb_mode(struct intel_engine_cs *engine,
> -- 
> 2.34.1
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation