[Intel-gfx] [PATCH] drm/i915/dg2: Add performance workaround 18019455067

[Lionel Landwerlin]

This is the recommended value for optimal performance.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 3 +++
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 07ef111947b8c..a50b5790e434e 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1112,6 +1112,9 @@
 #define   GEN12_PUSH_CONST_DEREF_HOLD_DIS	REG_BIT(8)
 
 #define RT_CTRL					_MMIO(0xe530)
+#define   NUMBER_OF_STACKIDS_512		(2 << 5)
+#define   NUMBER_OF_STACKIDS_1024		(1 << 5)
+#define   NUMBER_OF_STACKIDS_2048		(0 << 5)
 #define   DIS_NULL_QUERY			REG_BIT(10)
 
 #define EU_PERF_CNTL1				_MMIO(0xe558)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 3213c593a55f4..a8a389d36986c 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2106,6 +2106,9 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 		 * performance guide section.
 		 */
 		wa_write_or(wal, XEHP_L3SCQREG7, BLEND_FILL_CACHING_OPT_DIS);
+
+                /* Wa_18019455067:dg2 / BSpec 68331/54402 */
+                wa_write_or(wal, RT_CTRL, NUMBER_OF_STACKIDS_512);
 	}
 
 	if (IS_DG2_GRAPHICS_STEP(i915, G11, STEP_A0, STEP_B0)) {
-- 
2.32.0