[PATCH] drm/xe/xe2_lpg: Add workaround 14021567978

[Matt Roper]

On Thu, Apr 04, 2024 at 03:05:29PM +0530, Tejas Upadhyay wrote:
> Workaround 14021567978 applies to RenderCS xe2_lpg

This is one of those rare workarounds that's documented as not only
applying to the single platform that has the record in the WA database,
but also carrying forward to all future platforms forever (at least
until they make a permanent documentation change).  Since this starts
with the Xe2 family in general (not specific to LNL or BMG) and goes
forever, it might be best to write the bounds as 

        GRAPHICS_VERSION_RANGE(2000, XE_RTP_END_VERSION_UNDEFINED);

Also, it's still technically considered a "workaround" due to being
documented in the workaround database with a lineage number, rather than
a tuning setting documented on bspec 72161, so we should probably keep
this in xe_wa.c instead of xe_tuning.c.


Matt

> 
> Signed-off-by: Tejas Upadhyay <tejas.upadhyay at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_tuning.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_tuning.c b/drivers/gpu/drm/xe/xe_tuning.c
> index bb6db2817ada..cc65e5b4353b 100644
> --- a/drivers/gpu/drm/xe/xe_tuning.c
> +++ b/drivers/gpu/drm/xe/xe_tuning.c
> @@ -93,6 +93,13 @@ static const struct xe_rtp_entry_sr lrc_tunings[] = {
>  				   REG_FIELD_PREP(L3_PWM_TIMER_INIT_VAL_MASK, 0x7f)))
>  	},
>  
> +	/* Xe2_LPG */
> +
> +	{ XE_RTP_NAME("Tuning: TBIMR fast clip"),
> +	  XE_RTP_RULES(GRAPHICS_VERSION(2004), ENGINE_CLASS(RENDER)),
> +	  XE_RTP_ACTIONS(SET(CHICKEN_RASTER_2, TBIMR_FAST_CLIP))
> +	},
> +
>  	{}
>  };
>  
> -- 
> 2.25.1
> 

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