drm/i915: split enable/disable vblank code into chipset specific functions

This makes the Ironlake+ code trivial and generally simplifies things.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

drivers/gpu/drm/i915/i915_dma.c

@@ -1271,11 +1271,15 @@ static int i915_load_modeset_init(struct drm_device *dev)
 		dev->driver->irq_preinstall = ironlake_irq_preinstall;
 		dev->driver->irq_postinstall = ironlake_irq_postinstall;
 		dev->driver->irq_uninstall = ironlake_irq_uninstall;
+		dev->driver->enable_vblank = ironlake_enable_vblank;
+		dev->driver->disable_vblank = ironlake_disable_vblank;
 	} else {
 		dev->driver->irq_preinstall = i915_driver_irq_preinstall;
 		dev->driver->irq_postinstall = i915_driver_irq_postinstall;
 		dev->driver->irq_uninstall = i915_driver_irq_uninstall;
 		dev->driver->irq_handler = i915_driver_irq_handler;
+		dev->driver->enable_vblank = i915_enable_vblank;
+		dev->driver->disable_vblank = i915_disable_vblank;
 	}
 
 	ret = drm_irq_install(dev);

drivers/gpu/drm/i915/i915_drv.h

@@ -1040,6 +1040,8 @@ extern int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 				struct drm_file *file_priv);
 extern int i915_enable_vblank(struct drm_device *dev, int crtc);
 extern void i915_disable_vblank(struct drm_device *dev, int crtc);
+extern int ironlake_enable_vblank(struct drm_device *dev, int crtc);
+extern void ironlake_disable_vblank(struct drm_device *dev, int crtc);
 extern u32 i915_get_vblank_counter(struct drm_device *dev, int crtc);
 extern u32 gm45_get_vblank_counter(struct drm_device *dev, int crtc);
 extern int i915_vblank_swap(struct drm_device *dev, void *data,

drivers/gpu/drm/i915/i915_irq.c

@@ -1375,10 +1375,7 @@ int i915_enable_vblank(struct drm_device *dev, int pipe)
 		return -EINVAL;
 
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
-	if (HAS_PCH_SPLIT(dev))
-		ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
-					    DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
-	else if (INTEL_INFO(dev)->gen >= 4)
+	if (INTEL_INFO(dev)->gen >= 4)
 		i915_enable_pipestat(dev_priv, pipe,
 				     PIPE_START_VBLANK_INTERRUPT_ENABLE);
 	else
@@ -1393,6 +1390,22 @@ int i915_enable_vblank(struct drm_device *dev, int pipe)
 	return 0;
 }
 
+int ironlake_enable_vblank(struct drm_device *dev, int pipe)
+{
+	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+	unsigned long irqflags;
+
+	if (!i915_pipe_enabled(dev, pipe))
+		return -EINVAL;
+
+	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+	ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
+				    DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
+	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+	return 0;
+}
+
 /* Called from drm generic code, passed 'crtc' which
  * we use as a pipe index
  */
@@ -1406,13 +1419,20 @@ void i915_disable_vblank(struct drm_device *dev, int pipe)
 		I915_WRITE(INSTPM,
 			   INSTPM_AGPBUSY_DIS << 16 | INSTPM_AGPBUSY_DIS);
 
-	if (HAS_PCH_SPLIT(dev))
-		ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
-					     DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
-	else
-		i915_disable_pipestat(dev_priv, pipe,
-				      PIPE_VBLANK_INTERRUPT_ENABLE |
-				      PIPE_START_VBLANK_INTERRUPT_ENABLE);
+	i915_disable_pipestat(dev_priv, pipe,
+			      PIPE_VBLANK_INTERRUPT_ENABLE |
+			      PIPE_START_VBLANK_INTERRUPT_ENABLE);
+	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+}
+
+void ironlake_disable_vblank(struct drm_device *dev, int pipe)
+{
+	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+	unsigned long irqflags;
+
+	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+	ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
+				     DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 }