diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c
index f2cd069e4a17..105a677d472d 100644
--- a/drivers/clk/clk-fractional-divider.c
+++ b/drivers/clk/clk-fractional-divider.c
@@ -112,9 +112,18 @@ static int clk_fd_set_rate(struct clk_hw *hw, unsigned long rate,
 	 * which will lead to a large deviation in the result.
 	 * Therefore, it is required that the numerator must
 	 * be greater than 4.
+	 *
+	 * Note that there are some exceptions here:
+	 * If there is an even frac div, we need to keep the original
+	 * numerator(<4) and denominator. Otherwise, it may cause the
+	 * issue that the duty ratio is not 50%.
 	 */
 	if (m < 4 && m != 0) {
-		val = DIV_ROUND_UP(4, m);
+		if (n % 2 == 0)
+			val = 1;
+		else
+			val = DIV_ROUND_UP(4, m);
+
 		n *= val;
 		m *= val;
 		if (n > fd->nmask) {