diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index f0790fcc6b80..b4152f1d9ed8 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3338,6 +3338,9 @@ 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);
@@ -3707,6 +3710,7 @@ 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;
 }
@@ -3837,6 +3841,7 @@ 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);