The code uses readl() and writel(). Include the header file to
get the declarations.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
---
 drivers/gpu/ipu-v3/ipu-prv.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/ipu-v3/ipu-prv.h b/drivers/gpu/ipu-v3/ipu-prv.h
index 291ac1bab66d..d4621b1ea7f1 100644
--- a/drivers/gpu/ipu-v3/ipu-prv.h
+++ b/drivers/gpu/ipu-v3/ipu-prv.h
@@ -8,6 +8,7 @@
 
 struct ipu_soc;
 
+#include <linux/io.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/clk.h>
-- 
2.40.1