diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index 68af518..0e3f4ef 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -144,9 +144,9 @@
 	if (freq > pll->data->fmax)
 		freq = pll->data->fmax;
 
-	for (val = 0; val < 4; val++) {
+	for (val = 0; val < 5; val++) {
 		*postdiv = 1 << val;
-		if (freq * *postdiv >= fmin)
+		if ((u64)freq * *postdiv >= fmin)
 			break;
 	}