drm/i915: Remove unused code: i915_enable_interrupt()

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_drv.h

@@ -330,8 +330,6 @@ typedef struct drm_i915_private {
 	int cfb_plane;
 	int cfb_y;
 
-	int irq_enabled;
-
 	struct intel_opregion opregion;
 
 	/* overlay */
@@ -1001,7 +999,6 @@ extern int i915_irq_emit(struct drm_device *dev, void *data,
 extern int i915_irq_wait(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv);
 void i915_trace_irq_get(struct drm_device *dev, u32 seqno);
-extern void i915_enable_interrupt (struct drm_device *dev);
 
 extern irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS);
 extern void i915_driver_irq_preinstall(struct drm_device * dev);

drivers/gpu/drm/i915/i915_irq.c

@@ -1412,16 +1412,6 @@ void i915_disable_vblank(struct drm_device *dev, int pipe)
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 }
 
-void i915_enable_interrupt (struct drm_device *dev)
-{
-	struct drm_i915_private *dev_priv = dev->dev_private;
-
-	if (!HAS_PCH_SPLIT(dev))
-		intel_opregion_enable_asle(dev);
-	dev_priv->irq_enabled = 1;
-}
-
-
 /* Set the vblank monitor pipe
  */
 int i915_vblank_pipe_set(struct drm_device *dev, void *data,