@@ -548,9 +548,11 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 static void sun4i_i2s_start_capture(struct sun4i_i2s *i2s)
 {
 	/* Flush RX FIFO */
+	regcache_cache_bypass(i2s->regmap, true);
 	regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
 			   SUN4I_I2S_FIFO_CTRL_FLUSH_RX,
 			   SUN4I_I2S_FIFO_CTRL_FLUSH_RX);
+	regcache_cache_bypass(i2s->regmap, false);
 
 	/* Clear RX counter */
 	regmap_write(i2s->regmap, SUN4I_I2S_RX_CNT_REG, 0);

@@ -569,9 +571,11 @@ static void sun4i_i2s_start_capture(struct sun4i_i2s *i2s)
 static void sun4i_i2s_start_playback(struct sun4i_i2s *i2s)
 {
 	/* Flush TX FIFO */
+	regcache_cache_bypass(i2s->regmap, true);
 	regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
 			   SUN4I_I2S_FIFO_CTRL_FLUSH_TX,
 			   SUN4I_I2S_FIFO_CTRL_FLUSH_TX);
+	regcache_cache_bypass(i2s->regmap, false);
 
 	/* Clear TX counter */
 	regmap_write(i2s->regmap, SUN4I_I2S_TX_CNT_REG, 0);

@@ -703,13 +707,7 @@ static const struct snd_soc_component_driver sun4i_i2s_component = {
 
 static bool sun4i_i2s_rd_reg(struct device *dev, unsigned int reg)
 {
-	switch (reg) {
-	case SUN4I_I2S_FIFO_TX_REG:
-		return false;
-
-	default:
-		return true;
-	}
+	return true;
 }
 
 static bool sun4i_i2s_wr_reg(struct device *dev, unsigned int reg)

@@ -728,6 +726,8 @@ static bool sun4i_i2s_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case SUN4I_I2S_FIFO_RX_REG:
+	case SUN4I_I2S_FIFO_TX_REG:
+	case SUN4I_I2S_FIFO_STA_REG:
 	case SUN4I_I2S_INT_STA_REG:
 	case SUN4I_I2S_RX_CNT_REG:
 	case SUN4I_I2S_TX_CNT_REG:

@@ -738,23 +738,12 @@ static bool sun4i_i2s_volatile_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-static bool sun8i_i2s_rd_reg(struct device *dev, unsigned int reg)
-{
-	switch (reg) {
-	case SUN8I_I2S_FIFO_TX_REG:
-		return false;
-
-	default:
-		return true;
-	}
-}
-
 static bool sun8i_i2s_volatile_reg(struct device *dev, unsigned int reg)
 {
 	if (reg == SUN8I_I2S_INT_STA_REG)
 		return true;
 	if (reg == SUN8I_I2S_FIFO_TX_REG)
-		return false;
+		return true;
 
 	return sun4i_i2s_volatile_reg(dev, reg);
 }

@@ -809,7 +798,7 @@ static const struct regmap_config sun8i_i2s_regmap_config = {
 	.reg_defaults	= sun8i_i2s_reg_defaults,
 	.num_reg_defaults	= ARRAY_SIZE(sun8i_i2s_reg_defaults),
 	.writeable_reg	= sun4i_i2s_wr_reg,
-	.readable_reg	= sun8i_i2s_rd_reg,
+	.readable_reg	= sun4i_i2s_rd_reg,
 	.volatile_reg	= sun8i_i2s_volatile_reg,
 };