[Intel-gfx] [PATCH 2/4] drm/i915/skl: Implement WaHdcCtxNonCoherent

[Ben Widawsky]

Cc: Kristian Høgsberg <krh at bitplanet.net>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 62318a4..b8a445b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -841,6 +841,17 @@ static int chv_init_workarounds(struct intel_engine_cs *ring)
 	return 0;
 }
 
+static int skl_init_workarounds(struct intel_engine_cs *ring)
+{
+	struct drm_device *dev = ring->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	/* WaHdcCtxNonCoherent:skl */
+	WA_SET_BIT_MASKED(HDC_CHICKEN0, HDC_FORCE_CTX_NON_COHERENT);
+
+	return 0;
+}
+
 int init_workarounds_ring(struct intel_engine_cs *ring)
 {
 	struct drm_device *dev = ring->dev;
@@ -856,6 +867,9 @@ int init_workarounds_ring(struct intel_engine_cs *ring)
 	if (IS_CHERRYVIEW(dev))
 		return chv_init_workarounds(ring);
 
+	if (IS_SKYLAKE(dev))
+		return skl_init_workarounds(ring);
+
 	return 0;
 }
 
-- 
2.2.1