[PATCH v2] drm/i915/xelpg: Add Wa_14020495402

[Matt Roper]

On Mon, Mar 18, 2024 at 02:00:25PM -0700, Radhakrishna Sripada wrote:
> Disable clockgating for TDL SVHS fub.
> 
> v2: Implement in general render/compute wa's(MattR)
> 
> Bspec: 46045
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>

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

> ---
>  drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 1 +
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 6 +++++-
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index 50962cfd1353..1f778b77f4f8 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -1215,6 +1215,7 @@
>  #define   GEN12_DISABLE_EARLY_READ		REG_BIT(14)
>  #define   GEN12_ENABLE_LARGE_GRF_MODE		REG_BIT(12)
>  #define   GEN12_PUSH_CONST_DEREF_HOLD_DIS	REG_BIT(8)
> +#define   XELPG_DISABLE_TDL_SVHS_GATING		REG_BIT(1)
>  #define   GEN12_DISABLE_DOP_GATING              REG_BIT(0)
>  
>  #define RT_CTRL					MCR_REG(0xe530)
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index b079cbbc1897..d2c63ecc490e 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -2892,10 +2892,14 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
>  
>  	if (IS_GFX_GT_IP_STEP(gt, IP_VER(12, 70), STEP_B0, STEP_FOREVER) ||
>  	    IS_GFX_GT_IP_STEP(gt, IP_VER(12, 71), STEP_B0, STEP_FOREVER) ||
> -	    IS_GFX_GT_IP_RANGE(gt, IP_VER(12, 74), IP_VER(12, 74)))
> +	    IS_GFX_GT_IP_RANGE(gt, IP_VER(12, 74), IP_VER(12, 74))) {
>  		/* Wa_14017856879 */
>  		wa_mcr_masked_en(wal, GEN9_ROW_CHICKEN3, MTL_DISABLE_FIX_FOR_EOT_FLUSH);
>  
> +		/* Wa_14020495402 */
> +		wa_mcr_masked_en(wal, GEN8_ROW_CHICKEN2, XELPG_DISABLE_TDL_SVHS_GATING);
> +	}
> +
>  	if (IS_GFX_GT_IP_STEP(gt, IP_VER(12, 70), STEP_A0, STEP_B0) ||
>  	    IS_GFX_GT_IP_STEP(gt, IP_VER(12, 71), STEP_A0, STEP_B0))
>  		/*
> -- 
> 2.34.1
> 

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