drm/i915: Avoid a double-read of PCH_IIR during interrupt handling

commit 9adab8b5 upstream.

Currently the code re-reads PCH_IIR during the hotplug interrupt
processing. Not only is this a wasted read, but introduces a potential
for handling a spurious interrupt as we then may not clear all the
interrupts processed (since the re-read IIR may contains more interrupts
asserted than we clear using the result of the original read).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/gpu/drm/i915/i915_irq.c

@@ -424,14 +424,11 @@ static void gen6_pm_rps_work(struct work_struct *work)
 	mutex_unlock(&dev_priv->dev->struct_mutex);
 }
 
-static void pch_irq_handler(struct drm_device *dev)
+static void pch_irq_handler(struct drm_device *dev, u32 pch_iir)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
-	u32 pch_iir;
 	int pipe;
 
-	pch_iir = I915_READ(SDEIIR);
-
 	if (pch_iir & SDE_AUDIO_POWER_MASK)
 		DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
 				 (pch_iir & SDE_AUDIO_POWER_MASK) >>
@@ -529,7 +526,7 @@ static irqreturn_t ivybridge_irq_handler(DRM_IRQ_ARGS)
 	if (de_iir & DE_PCH_EVENT_IVB) {
 		if (pch_iir & SDE_HOTPLUG_MASK_CPT)
 			queue_work(dev_priv->wq, &dev_priv->hotplug_work);
-		pch_irq_handler(dev);
+		pch_irq_handler(dev, pch_iir);
 	}
 
 	if (pm_iir & GEN6_PM_DEFERRED_EVENTS) {
@@ -629,7 +626,7 @@ static irqreturn_t ironlake_irq_handler(DRM_IRQ_ARGS)
 	if (de_iir & DE_PCH_EVENT) {
 		if (pch_iir & hotplug_mask)
 			queue_work(dev_priv->wq, &dev_priv->hotplug_work);
-		pch_irq_handler(dev);
+		pch_irq_handler(dev, pch_iir);
 	}
 
 	if (de_iir & DE_PCU_EVENT) {