[Intel-gfx] [PATCH] drm/i915/dg2: Introduce Wa_18017747507

[Wayne Boyer <wayne.boyer@intel.com>]

WA 18017747507 applies to all DG2 skus.

BSpec: 56035, 46121, 68173

Signed-off-by: Wayne Boyer <wayne.boyer@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 f4624262dc81..27b2641e1a53 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -501,6 +501,9 @@
 #define VF_PREEMPTION				_MMIO(0x83a4)
 #define   PREEMPTION_VERTEX_COUNT		REG_GENMASK(15, 0)
 
+#define VFG_PREEMPTION_CHICKEN			_MMIO(0x83b4)
+#define  POLYGON_TRIFAN_LINELOOP_DISABLE	REG_BIT(4)
+
 #define GEN8_RC6_CTX_INFO			_MMIO(0x8504)
 
 #define XEHP_SQCM				MCR_REG(0x8724)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 2a35e7e66625..3cdf5c24dbc5 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2975,6 +2975,9 @@ 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_18017747507:dg2 */
+		wa_masked_en(wal, VFG_PREEMPTION_CHICKEN, POLYGON_TRIFAN_LINELOOP_DISABLE);
 	}
 }
 
-- 
2.37.3