diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index 3acae9805b21..6246c5182fd2 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -73,7 +73,7 @@
 /*
  * regs for pwm v4
  */
-#define HIWORD_UPDATE(v, l, h)	(((v) << (l)) | (GENMASK(h, l) << 16))
+#define HIWORD_UPDATE(v, l, h)	((((v) << (l)) & GENMASK((h), (l))) | (GENMASK(h, l) << 16))
 
 /* VERSION_ID */
 #define VERSION_ID			0x0