diff --git a/arch/mips/alchemy/common/clock.c b/arch/mips/alchemy/common/clock.c
index 3612d76007a45c29201ea0960e21ac6b0ced43b2..4b5ec49139c227f062cffa71fa6155c0c124f97b 100644
--- a/arch/mips/alchemy/common/clock.c
+++ b/arch/mips/alchemy/common/clock.c
@@ -127,6 +127,8 @@ static unsigned long alchemy_clk_cpu_recalc(struct clk_hw *hw,
 		t = 396000000;
 	else {
 		t = alchemy_rdsys(AU1000_SYS_CPUPLL) & 0x7f;
+		if (alchemy_get_cputype() < ALCHEMY_CPU_AU1300)
+			t &= 0x3f;
 		t *= parent_rate;
 	}