drm/xe/xelpg: Add Wa_14020495402

Disable clockgating for TDL SVHS fub.

v2: Extend the Wa to 1274(MattR)

Bspec: 46045
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240318210120.564692-1-radhakrishna.sripada@intel.com

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -364,6 +364,7 @@
 #define   DISABLE_EARLY_READ			REG_BIT(14)
 #define   ENABLE_LARGE_GRF_MODE			REG_BIT(12)
 #define   PUSH_CONST_DEREF_HOLD_DIS		REG_BIT(8)
+#define   DISABLE_TDL_SVHS_GATING		REG_BIT(1)
 #define   DISABLE_DOP_GATING			REG_BIT(0)
 
 #define RT_CTRL					XE_REG_MCR(0xe530)

drivers/gpu/drm/xe/xe_wa.c

@@ -401,6 +401,11 @@ static const struct xe_rtp_entry_sr engine_was[] = {
 	  XE_RTP_ACTIONS(SET(XEHP_HDC_CHICKEN0, DIS_ATOMIC_CHAINING_TYPED_WRITES,
 			     XE_RTP_NOCHECK))
 	},
+	{ XE_RTP_NAME("14020495402"),
+	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1270, 1274),
+		       FUNC(xe_rtp_match_first_render_or_compute)),
+	  XE_RTP_ACTIONS(SET(ROW_CHICKEN2, DISABLE_TDL_SVHS_GATING))
+	},
 
 	/* Xe2_LPG */