--- zzzz-none-000/linux-3.10.107/include/drm/drm_cache.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/drm/drm_cache.h	2021-02-04 17:41:59.000000000 +0000
@@ -35,4 +35,15 @@
 
 void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
 
+static inline bool drm_arch_can_wc_memory(void)
+{
+#if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
+	return false;
+#elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON3)
+	return false;
+#else
+	return true;
+#endif
+}
+
 #endif