drm: add helper to check for wc memory support

Reviewed-by: Christian König <[email protected]>
Reviewed-by: Michel Dänzer <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Oded Gabbay <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Cc: [email protected]

diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
index 7bfb063029d83fe1374e78a174f4a638bc39bc49..461a0558bca4d8d16e81b88e0286e3fa6251ab79 100644 (file)
--- a/include/drm/drm_cache.h
+++ b/include/drm/drm_cache.h
@@ -35,4 +35,13 @@
 
 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;
+#else
+       return true;
+#endif
+}
+
 #endif