+ iommu = of_parse_phandle(port->parent, "iommus", 0);
+ if (!iommu || !of_device_is_available(iommu->parent)) {
+ dev_dbg(dev, "no iommu attached for %s, using non-iommu buffers\n",
+ port->parent->full_name);
+ /*
+ * if there is a crtc not support iommu, force set all
+ * crtc use non-iommu buffer.
+ */
+ is_support_iommu = false;
+ }
+