[Intel-xe] [PATCH] drm/xe/xelpmp: Add Wa_16021867713

[Matt Roper]

On Mon, Nov 06, 2023 at 06:06:57PM -0300, Gustavo Sousa wrote:
> This workaround applies to all steppings of Xe_LPM+. Implement the KMD
> part.
> 
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>

Looks like this is trending to also be needed on LNL's Xe2_LPM as well,
although that isn't quite finalized yet.  We can come back and deal with
that if/when it becomes final.

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

> ---
>  drivers/gpu/drm/xe/regs/xe_engine_regs.h | 3 +++
>  drivers/gpu/drm/xe/xe_wa.c               | 6 ++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/regs/xe_engine_regs.h b/drivers/gpu/drm/xe/regs/xe_engine_regs.h
> index 35dd4837dd75..b57dec17eb2d 100644
> --- a/drivers/gpu/drm/xe/regs/xe_engine_regs.h
> +++ b/drivers/gpu/drm/xe/regs/xe_engine_regs.h
> @@ -118,4 +118,7 @@
>  #define VDBOX_CGCTL3F18(base)			XE_REG((base) + 0x3f18)
>  #define   ALNUNIT_CLKGATE_DIS			REG_BIT(13)
>  
> +#define VDBOX_CGCTL3F1C(base)			XE_REG((base) + 0x3f1c)
> +#define   MFXPIPE_CLKGATE_DIS			REG_BIT(3)
> +
>  #endif
> diff --git a/drivers/gpu/drm/xe/xe_wa.c b/drivers/gpu/drm/xe/xe_wa.c
> index 2f1782db267b..614e114a5342 100644
> --- a/drivers/gpu/drm/xe/xe_wa.c
> +++ b/drivers/gpu/drm/xe/xe_wa.c
> @@ -248,6 +248,12 @@ static const struct xe_rtp_entry_sr gt_was[] = {
>  
>  	/* Xe_LPM+ */
>  
> +	{ XE_RTP_NAME("16021867713"),
> +	  XE_RTP_RULES(MEDIA_VERSION(1300),
> +		       ENGINE_CLASS(VIDEO_DECODE)),
> +	  XE_RTP_ACTIONS(SET(VDBOX_CGCTL3F1C(0), MFXPIPE_CLKGATE_DIS)),
> +	  XE_RTP_ENTRY_FLAG(FOREACH_ENGINE),
> +	},
>  	{ XE_RTP_NAME("22016670082"),
>  	  XE_RTP_RULES(MEDIA_VERSION(1300)),
>  	  XE_RTP_ACTIONS(SET(XELPMP_SQCNT1, ENFORCE_RAR))
> -- 
> 2.42.0
> 

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