ASoC: tas2770: Set the SDOUT polarity correctly

TX launch polarity needs to be the opposite of RX capture polarity, to
generate the right bit slot alignment.

Signed-off-by: Hector Martin <marcan@marcan.st>

Author: marcan

sound/soc/codecs/tas2770.c

@@ -364,7 +364,7 @@ static int tas2770_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	struct snd_soc_component *component = dai->component;
 	struct tas2770_priv *tas2770 =
 			snd_soc_component_get_drvdata(component);
-	u8 tdm_rx_start_slot = 0, invert_fpol = 0, fpol_preinv = 0, asi_cfg_1 = 0;
+	u8 tdm_rx_start_slot = 0, invert_fpol = 0, fpol_preinv = 0, asi_cfg_1 = 0, asi_cfg_4 = 0;
 	int ret;
 
 	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
@@ -381,6 +381,7 @@ static int tas2770_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 		fallthrough;
 	case SND_SOC_DAIFMT_NB_NF:
 		asi_cfg_1 |= TAS2770_TDM_CFG_REG1_RX_RSING;
+		asi_cfg_4 |= TAS2770_TDM_CFG_REG4_TX_EDGE_FALLING;
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		invert_fpol = 1;
@@ -399,6 +400,12 @@ static int tas2770_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	if (ret < 0)
 		return ret;
 
+	ret = snd_soc_component_update_bits(component, TAS2770_TDM_CFG_REG4,
+					    TAS2770_TDM_CFG_REG4_TX_EDGE_FALLING,
+					    asi_cfg_4);
+	if (ret < 0)
+		return ret;
+
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		tdm_rx_start_slot = 1;