diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
index 265a1d7426a7..e04b90430211 100644
--- a/drivers/mmc/host/dw_mmc-rockchip.c
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
@@ -211,6 +211,9 @@ static int dw_mci_rk3288_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
 
 	/* Try each phase and extract good ranges */
 	for (i = 0; i < priv->num_phases; ) {
+		/* Cannot guarantee any phases larger than 270 would work well */
+		if (TUNING_ITERATION_TO_PHASE(i, priv->num_phases) > 270)
+			break;
 		clk_set_phase(priv->sample_clk,
 			      TUNING_ITERATION_TO_PHASE(i, priv->num_phases));