[Intel-gfx] [PATCH] drm/i915: Add Wa_18028616096

[Shekhar Chauhan]

Drop UGM per set fragment threshold to 3

BSpec: 54833
Signed-off-by: Shekhar Chauhan <shekhar.chauhan at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 1 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index a00ff51c681d..f8ab99affa15 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1227,6 +1227,7 @@
 #define EU_PERF_CNTL3				PERF_REG(0xe758)
 
 #define LSC_CHICKEN_BIT_0			MCR_REG(0xe7c8)
+#define   UGM_FRAGMENT_THRESHOLD_TO_3		REG_BIT(58)
 #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)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 660d4f358eab..3f3977014ee7 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2914,6 +2914,9 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
 		 * Wa_22015475538:dg2
 		 */
 		wa_mcr_write_or(wal, LSC_CHICKEN_BIT_0_UDW, DIS_CHAIN_2XSIMD8);
+
+		/* Wa_18028616096:dg2 */
+		wa_mcr_write_or(wal, LSC_CHICKEN_BIT_0, UGM_FRAGMENT_THRESHOLD_TO_3);
 	}
 
 	if (IS_DG2_G11(i915)) {
-- 
2.34.1