-int psb_enable_vblank(struct drm_device *dev, int pipe);
-void psb_disable_vblank(struct drm_device *dev, int pipe);
-u32 psb_get_vblank_counter(struct drm_device *dev, int pipe);
+int psb_enable_vblank(struct drm_device *dev, unsigned int pipe);
+void psb_disable_vblank(struct drm_device *dev, unsigned int pipe);
+u32 psb_get_vblank_counter(struct drm_device *dev, unsigned int pipe);