[Intel-gfx] [PATCH 1/2] drm/i915/mtl: Add workarounds Wa_14017066071 and Wa_14017654203

[Matt Roper]

On Wed, Mar 29, 2023 at 05:24:50PM -0300, Gustavo Sousa wrote:
> From: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> 
> Both workarounds require the same implementation and apply to MTL P and
> M from stepping A0 to B0 (exclusive).
> 
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_gt_regs.h     |  1 +
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 12 ++++++++++--
>  2 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index 4aecb5a7b631..1ec855813632 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -1144,6 +1144,7 @@
>  #define   ENABLE_SMALLPL			REG_BIT(15)
>  #define   SC_DISABLE_POWER_OPTIMIZATION_EBB	REG_BIT(9)
>  #define   GEN11_SAMPLER_ENABLE_HEADLESS_MSG	REG_BIT(5)
> +#define   MTL_DISABLE_SAMPLER_SC_OOO		REG_BIT(3)
>  
>  #define GEN9_HALF_SLICE_CHICKEN7		MCR_REG(0xe194)
>  #define   DG2_DISABLE_ROUND_ENABLE_ALLOW_FOR_SSLA	REG_BIT(15)
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index e7ee24bcad89..cafdf66d9562 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -2388,11 +2388,10 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
>  	struct drm_i915_private *i915 = engine->i915;
>  
>  	if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_A0, STEP_B0) ||
> -	    IS_MTL_GRAPHICS_STEP(i915, P, STEP_A0, STEP_B0)) {
> +	    IS_MTL_GRAPHICS_STEP(i915, P, STEP_A0, STEP_B0))
>  		/* Wa_22014600077 */
>  		wa_mcr_masked_en(wal, GEN10_CACHE_MODE_SS,
>  				 ENABLE_EU_COUNT_FOR_TDL_FLUSH);
> -	}

The brace removal here doesn't seem to be related to this patch.

Aside from that, the actual workaround addition below is

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

>  
>  	if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_A0, STEP_B0) ||
>  	    IS_MTL_GRAPHICS_STEP(i915, P, STEP_A0, STEP_B0) ||
> @@ -2971,6 +2970,15 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
>  
>  	add_render_compute_tuning_settings(i915, wal);
>  
> +	if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_A0, STEP_B0) ||
> +	    IS_MTL_GRAPHICS_STEP(i915, P, STEP_A0, STEP_B0))
> +		/*
> +		 * Wa_14017066071
> +		 * Wa_14017654203
> +		 */
> +		wa_mcr_masked_en(wal, GEN10_SAMPLER_MODE,
> +				 MTL_DISABLE_SAMPLER_SC_OOO);
> +
>  	if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_A0, STEP_B0) ||
>  	    IS_MTL_GRAPHICS_STEP(i915, P, STEP_A0, STEP_B0) ||
>  	    IS_DG2_GRAPHICS_STEP(i915, G10, STEP_B0, STEP_FOREVER) ||
> -- 
> 2.40.0
> 

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