[Intel-gfx] [PATCH] drm/i915/bdw: Implement WaForceContextSaveRestoreNonCoherent

[Damien Lespiau]

Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h         | 1 +
 drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ae8ea42..47bc4e2 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5253,6 +5253,7 @@ enum punit_power_well {
 
 /* GEN8 chicken */
 #define HDC_CHICKEN0				0x7300
+#define  HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT	(1<<5)
 #define  HDC_FORCE_NON_COHERENT			(1<<4)
 #define  HDC_DONOT_FETCH_MEM_WHEN_MASKED	(1<<11)
 #define  HDC_FENCE_DEST_SLM_DISABLE		(1<<14)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 36dad33..d393026 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -790,9 +790,11 @@ static int bdw_init_workarounds(struct intel_engine_cs *ring)
 	 */
 	/* WaForceEnableNonCoherent:bdw */
 	/* WaHdcDisableFetchWhenMasked:bdw */
+	/* WaForceContextSaveRestoreNonCoherent:bdw */
 	/* WaDisableFenceDestinationToSLM:bdw (GT3 pre-production) */
 	WA_SET_BIT_MASKED(HDC_CHICKEN0,
 			  HDC_FORCE_NON_COHERENT |
+			  HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT |
 			  HDC_DONOT_FETCH_MEM_WHEN_MASKED |
 			  (IS_BDW_GT3(dev) ? HDC_FENCE_DEST_SLM_DISABLE : 0));
 
-- 
1.8.3.1