Re: [PATCH] drm/xe/xe2_hpg: Apply Wa_14024997852

[Matt Roper <matthew.d.roper@intel.com>]

On Thu, Feb 05, 2026 at 10:38:18AM +0530, Arvind Yadav wrote:
> Applied Wa_14024997852 to Graphics version 20.02
> 
> Cc: Nitin Gote <nitin.r.gote@intel.com>
> Cc: Tejas Upadhyay <tejas.upadhyay@intel.com>
> Signed-off-by: Arvind Yadav <arvind.yadav@intel.com>
> ---
>  drivers/gpu/drm/xe/xe_wa.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_wa.c b/drivers/gpu/drm/xe/xe_wa.c
> index 1e8d61ac581b..2f838c99596f 100644
> --- a/drivers/gpu/drm/xe/xe_wa.c
> +++ b/drivers/gpu/drm/xe/xe_wa.c
> @@ -874,6 +874,17 @@ static const struct xe_rtp_entry_sr lrc_was[] = {
>  	  XE_RTP_ACTIONS(SET(COMMON_SLICE_CHICKEN1, DISABLE_BOTTOM_CLIP_RECTANGLE_TEST))
>  	},
>  
> +	{ XE_RTP_NAME("14024997852"),
> +	  XE_RTP_RULES(GRAPHICS_VERSION(2002), GRAPHICS_STEP(A0, B0),
> +		       ENGINE_CLASS(RENDER)),
> +	  XE_RTP_ACTIONS(SET(FF_MODE,
> +			     DIS_MESH_PARTIAL_AUTOSTRIP |
> +			     DIS_MESH_AUTOSTRIP),
> +			 SET(VFLSKPD,
> +			     DIS_PARTIAL_AUTOSTRIP |
> +			     DIS_AUTOSTRIP))

This workaround asks that these settings be programmed only in specific
cases (primitive ID enabled || cut index enabled).  That's referring to
3D state that's controlled by the UMD and may change on a batch-by-batch
basis.  So we shouldn't be doing this programming directly in the
kernel, otherwise it will be in effect even at times we don't want it to
be.  Instead we just need to whitelist these registers to allow the UMD
to make the necessary changes on the fly.

We already whitelist these for the Xe3 platforms; the necessary change
is to also extend that whitelisting back to some of the Xe2 IPs.


Matt

> +	},
> +
>  	/* Xe3_LPG */
>  	{ XE_RTP_NAME("14021490052"),
>  	  XE_RTP_RULES(GRAPHICS_VERSION(3000), GRAPHICS_STEP(A0, B0),
> -- 
> 2.43.0
> 

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