drm/i915: Add Wa_18028616096

Drop UGM per set fragment threshold to 3

BSpec: 54833
Signed-off-by: Shekhar Chauhan <shekhar.chauhan@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
[mattrope: moved above xehpsdv block for consistency]
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230922155356.583595-1-shekhar.chauhan@intel.com

Author: shekhar-chauhan

drivers/gpu/drm/i915/gt/intel_gt_regs.h

@@ -1232,6 +1232,7 @@
 #define   DISABLE_D8_D16_COASLESCE		REG_BIT(30)
 #define   FORCE_1_SUB_MESSAGE_PER_FRAGMENT	REG_BIT(15)
 #define LSC_CHICKEN_BIT_0_UDW			MCR_REG(0xe7c8 + 4)
+#define   UGM_FRAGMENT_THRESHOLD_TO_3		REG_BIT(58 - 32)
 #define   DIS_CHAIN_2XSIMD8			REG_BIT(55 - 32)
 #define   FORCE_SLM_FENCE_SCOPE_TO_TILE		REG_BIT(42 - 32)
 #define   FORCE_UGM_FENCE_SCOPE_TO_TILE		REG_BIT(41 - 32)

drivers/gpu/drm/i915/gt/intel_workarounds.c

@@ -2941,6 +2941,11 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
 			   true);
 	}
 
+	if (IS_DG2_G10(i915) || IS_DG2_G12(i915)) {
+		/* Wa_18028616096 */
+		wa_mcr_write_or(wal, LSC_CHICKEN_BIT_0_UDW, UGM_FRAGMENT_THRESHOLD_TO_3);
+	}
+
 	if (IS_XEHPSDV(i915)) {
 		/* Wa_1409954639 */
 		wa_mcr_masked_en(wal,