[Intel-gfx] [PATCH 10/10] drm/i915: also POSTING_READ(DEIER) on ivybridge_irq_handler

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

This is already done on ironlake_irq_handler. We want to make sure the
interrupts are disabled before we check any of the other interrupt
registers.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 09bd8d4..e9a6ade 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -786,6 +786,7 @@ static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
 	/* disable master interrupt before clearing iir  */
 	de_ier = I915_READ(DEIER);
 	I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
+	POSTING_READ(DEIER);
 
 	/* On Haswell, also mask ERR_INT because we don't want to risk
 	 * generating "unclaimed register" interrupts from inside the interrupt
-- 
1.7.10.4