diff --git a/sound/soc/rockchip/rockchip_spdifrx.c b/sound/soc/rockchip/rockchip_spdifrx.c
index d5e7455c809a..0e457232116d 100644
--- a/sound/soc/rockchip/rockchip_spdifrx.c
+++ b/sound/soc/rockchip/rockchip_spdifrx.c
@@ -216,6 +216,7 @@ static bool rk_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
 	case SPDIFRX_FIFOCTRL:
 	case SPDIFRX_INTSR:
 	case SPDIFRX_INTCLR:
+	case SPDIFRX_SMPDR:
 	case SPDIFRX_BURSTINFO:
 		return true;
 	default:
@@ -223,6 +224,16 @@ static bool rk_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
 	}
 }
 
+static bool rk_spdifrx_precious_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case SPDIFRX_SMPDR:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static const struct regmap_config rk_spdifrx_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
@@ -231,6 +242,7 @@ static const struct regmap_config rk_spdifrx_regmap_config = {
 	.writeable_reg = rk_spdifrx_wr_reg,
 	.readable_reg = rk_spdifrx_rd_reg,
 	.volatile_reg = rk_spdifrx_volatile_reg,
+	.precious_reg = rk_spdifrx_precious_reg,
 	.cache_type = REGCACHE_FLAT,
 };