[Intel-gfx] [PATCH 2/2] drm/i915/vlv: Enabling the TLB invalidate bit in GFX Mode register

[sourab.gupta at intel.com]

From: Akash Goel <akash.goel at intel.com>

This patch Enables the bit for TLB invalidate in GFX Mode register.

According to bspec,  When enabled this bit limits the invalidation
of the TLB only to batch buffer boundaries, to pipe_control
commands which have the TLB invalidation bit set and sync flushes.
If disabled, the TLB caches are flushed for every full flush of
the pipeline.

Signed-off-by: Akash Goel <akash.goel at intel.com>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 7da5774..320637b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -586,10 +586,16 @@ static int init_render_ring(struct intel_ring_buffer *ring)
 		I915_WRITE(GFX_MODE,
 			   _MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_ALWAYS));
 
-	if (IS_GEN7(dev))
-		I915_WRITE(GFX_MODE_GEN7,
-			   _MASKED_BIT_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) |
-			   _MASKED_BIT_ENABLE(GFX_REPLAY_MODE));
+	if (IS_GEN7(dev)) {
+		if (IS_VALLEYVIEW(dev)) {
+			/* FIXME, should also apply to ivb */
+			I915_WRITE(GFX_MODE_GEN7,
+					_MASKED_BIT_ENABLE(GFX_REPLAY_MODE));
+		} else
+			I915_WRITE(GFX_MODE_GEN7,
+					_MASKED_BIT_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) |
+					_MASKED_BIT_ENABLE(GFX_REPLAY_MODE));
+	}
 
 	if (INTEL_INFO(dev)->gen >= 5) {
 		ret = init_pipe_control(ring);
-- 
1.8.5.1