drm/i915/gtt: call chipset flush directly

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 291ac51..8e2e208 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -1476,6 +1476,13 @@
 }
 EXPORT_SYMBOL(intel_gtt_get);
 
+void intel_gtt_chipset_flush(void)
+{
+	if (intel_private.driver->chipset_flush)
+		intel_private.driver->chipset_flush();
+}
+EXPORT_SYMBOL(intel_gtt_chipset_flush);
+
 void intel_gmch_remove(struct pci_dev *pdev)
 {
 	if (intel_private.pcidev)