This one is missed in last pipe control fix for sandybridge,
that really unmask interrupt bit for notify in render engine IMR.

Signed-off-by: Zhenyu Wang <zhen...@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 69a36fc..16861b8 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1381,12 +1381,17 @@ static int ironlake_irq_postinstall(struct drm_device 
*dev)
        I915_WRITE(DEIER, dev_priv->de_irq_enable_reg);
        (void) I915_READ(DEIER);
 
-       /* user interrupt should be enabled, but masked initial */
+       /* Gen6 only needs render pipe_control now */
+       if (IS_GEN6(dev))
+               render_mask = GT_PIPE_NOTIFY;
+
        dev_priv->gt_irq_mask_reg = ~render_mask;
        dev_priv->gt_irq_enable_reg = render_mask;
 
        I915_WRITE(GTIIR, I915_READ(GTIIR));
        I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
+       if (IS_GEN6(dev))
+               I915_WRITE(GEN6_RENDER_IMR, 
~GEN6_RENDER_PIPE_CONTROL_NOTIFY_INTERRUPT);
        I915_WRITE(GTIER, dev_priv->gt_irq_enable_reg);
        (void) I915_READ(GTIER);
 
-- 
1.7.0.4

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