drm/i915: use runtime irq suspend/resume in freeze/thaw

We don't need to uninstall the full handler, simply disabling interrupts
ought to be enough.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.c

@@ -522,7 +522,7 @@ static int i915_drm_freeze(struct drm_device *dev)
 			return error;
 		}
 
-		drm_irq_uninstall(dev);
+		intel_runtime_pm_disable_interrupts(dev);
 		dev_priv->enable_hotplug_processing = false;
 
 		intel_suspend_gt_powersave(dev);
@@ -646,8 +646,7 @@ static int __i915_drm_thaw(struct drm_device *dev, bool restore_gtt_mappings)
 		}
 		mutex_unlock(&dev->struct_mutex);
 
-		/* We need working interrupts for modeset enabling ... */
-		drm_irq_install(dev, dev->pdev->irq);
+		intel_runtime_pm_restore_interrupts(dev);
 
 		intel_modeset_init_hw(dev);
 

drivers/gpu/drm/i915/intel_pm.c

@@ -4880,7 +4880,7 @@ void intel_suspend_gt_powersave(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	/* Interrupts should be disabled already to avoid re-arming. */
-	WARN_ON(dev->irq_enabled);
+	WARN_ON(dev->irq_enabled && !dev_priv->pm.irqs_disabled);
 
 	flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 
@@ -4892,7 +4892,7 @@ void intel_disable_gt_powersave(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	/* Interrupts should be disabled already to avoid re-arming. */
-	WARN_ON(dev->irq_enabled);
+	WARN_ON(dev->irq_enabled && !dev_priv->pm.irqs_disabled);
 
 	if (IS_IRONLAKE_M(dev)) {
 		ironlake_disable_drps(dev);