[Intel-gfx] [PATCH V3] drm/i915/dg2: add Wa_14014947963

[clinton.a.taylor at intel.com]

From: Clint Taylor <clinton.a.taylor at intel.com>

BSPEC: 46123
v2: Address review feedback [MattR]
v3: move register definition to gt_regs [MattR]
Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 3 +++
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index a6f0220c2e9f..5c8c3bc65acc 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -124,6 +124,9 @@
 #define   ECOCHK_PPGTT_WT_HSW		(0x2 << 3)
 #define   ECOCHK_PPGTT_WB_HSW		(0x3 << 3)
 
+#define VF_PREEMPTION			_MMIO(0x83a4)
+#define  PREEMPTION_VERTEX_COUNT	REG_GENMASK(15, 0)
+
 #define GEN8_RC6_CTX_INFO		_MMIO(0x8504)
 
 #define GAC_ECO_BITS			_MMIO(0x14090)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index b146a393cd79..9416b1434c64 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -689,6 +689,11 @@ static void dg2_ctx_workarounds_init(struct intel_engine_cs *engine,
 	    IS_DG2_GRAPHICS_STEP(engine->i915, G11, STEP_A0, STEP_B0))
 		wa_masked_en(wal, GEN9_HALF_SLICE_CHICKEN7,
 			     DG2_DISABLE_ROUND_ENABLE_ALLOW_FOR_SSLA);
+
+	/* wa_14014947963: dg2_g10 [B0..NONE] dg2_g11 dg2_g12 */
+	if (IS_DG2_GRAPHICS_STEP(engine->i915, G10, STEP_B0, STEP_FOREVER) ||
+		IS_DG2_G11(engine->i915) || IS_DG2_G12(engine->i915))
+		wa_masked_field_set(wal, VF_PREEMPTION, PREEMPTION_VERTEX_COUNT, 0x4000);
 }
 
 static void fakewa_disable_nestedbb_mode(struct intel_engine_cs *engine,
-- 
2.34.1