[PATCH 3/6] drm/i915: don't read or write GEN6_PMIIR on Gen 5

[Paulo Zanoni <przanoni@gmail.com>]

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

The register doesn't exist on Gen 5.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index c45578d..f9b97ab 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1366,7 +1366,7 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg)
 	struct drm_device *dev = (struct drm_device *) arg;
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 	int ret = IRQ_NONE;
-	u32 de_iir, gt_iir, de_ier, pm_iir, sde_ier;
+	u32 de_iir, gt_iir, de_ier, pm_iir = 0, sde_ier;
 
 	atomic_inc(&dev_priv->irq_received);
 
@@ -1386,7 +1386,8 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg)
 
 	de_iir = I915_READ(DEIIR);
 	gt_iir = I915_READ(GTIIR);
-	pm_iir = I915_READ(GEN6_PMIIR);
+	if (IS_GEN6(dev))
+		pm_iir = I915_READ(GEN6_PMIIR);
 
 	if (de_iir == 0 && gt_iir == 0 && (!IS_GEN6(dev) || pm_iir == 0))
 		goto done;
@@ -1406,7 +1407,8 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg)
 
 	I915_WRITE(GTIIR, gt_iir);
 	I915_WRITE(DEIIR, de_iir);
-	I915_WRITE(GEN6_PMIIR, pm_iir);
+	if (IS_GEN6(dev))
+		I915_WRITE(GEN6_PMIIR, pm_iir);
 
 done:
 	I915_WRITE(DEIER, de_ier);
-- 
1.8.1.2