drm: kill drm_agp_chipset_flush

No longer used.

Cc: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/drm_agpsupport.c b/drivers/gpu/drm/drm_agpsupport.c
index 252fdb9..0cb2ba5 100644
--- a/drivers/gpu/drm/drm_agpsupport.c
+++ b/drivers/gpu/drm/drm_agpsupport.c
@@ -466,10 +466,4 @@
 }
 EXPORT_SYMBOL(drm_agp_bind_pages);
 
-void drm_agp_chipset_flush(struct drm_device *dev)
-{
-	agp_flush_chipset(dev->agp->bridge);
-}
-EXPORT_SYMBOL(drm_agp_chipset_flush);
-
 #endif /* __OS_HAS_AGP */
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index d4bc0f5..628f767 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1319,7 +1319,6 @@
 extern int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request);
 extern int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv);
-extern void drm_agp_chipset_flush(struct drm_device *dev);
 
 				/* Stub support (drm_stub.h) */
 extern int drm_setmaster_ioctl(struct drm_device *dev, void *data,