diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 7a748785c545..4676cf2900df 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -298,6 +298,10 @@ static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
 		if (refclk_lut[i] == refclk_rate)
 			break;
 
+	/* avoid buffer overflow and "1" is the default rate in the datasheet. */
+	if (i >= refclk_lut_size)
+		i = 1;
+
 	regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK,
 			   REFCLK_FREQ(i));