diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
index 193e314..ad50dd9 100644
--- a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
+++ b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
@@ -148,13 +148,18 @@
 {
 	struct sunxi_ccm_reg * const ccm =
 		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
-	const int k = 2;
-	const int m = 1;
+	const int max_n = 32;
+	int k = 1, m = 2;
 
 	if (sigma_delta_enable)
 		writel(CCM_PLL5_PATTERN, &ccm->pll5_pattern_cfg);
 
 	/* PLL5 rate = 24000000 * n * k / m */
+	if (clk > 24000000 * k * max_n / m) {
+		m = 1;
+		if (clk > 24000000 * k * max_n / m)
+			k = 2;
+	}
 	writel(CCM_PLL5_CTRL_EN |
 	       (sigma_delta_enable ? CCM_PLL5_CTRL_SIGMA_DELTA_EN : 0) |
 	       CCM_PLL5_CTRL_UPD |