[Intel-gfx] [PATCH 02/12] drm/i915: Set up VLV_MASTER_IER consistently

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We're lacking VLV_MASTER_IER setup from valleyview_irq_preinstall(), so
add it there. Also cargo cult in some POSTING_READ()s to match the other
platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 165cb4ecb0ad..f96a374ea624 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3355,6 +3355,9 @@ static void valleyview_irq_preinstall(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
+	I915_WRITE(VLV_MASTER_IER, 0);
+	POSTING_READ(VLV_MASTER_IER);
+
 	gen5_gt_irq_reset(dev);
 
 	spin_lock_irq(&dev_priv->irq_lock);
@@ -3724,6 +3727,7 @@ static int valleyview_irq_postinstall(struct drm_device *dev)
 	spin_unlock_irq(&dev_priv->irq_lock);
 
 	I915_WRITE(VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);
+	POSTING_READ(VLV_MASTER_IER);
 
 	return 0;
 }
@@ -3854,6 +3858,7 @@ static void valleyview_irq_uninstall(struct drm_device *dev)
 		return;
 
 	I915_WRITE(VLV_MASTER_IER, 0);
+	POSTING_READ(VLV_MASTER_IER);
 
 	gen5_gt_irq_reset(dev);
 
-- 
2.7.4