[PATCH V2] ASoC: fsl_esai: Support synchronous mode

["S.j. Wang" <shengjiu.wang@nxp.com>]

In ESAI synchronous mode, the clock is generated by Tx, So
we should always set registers of Tx which relate with the
bit clock and frame clock generation (TCCR, TCR, ECR), even
there is only Rx is working.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
changes in v2
- refine the patch according Nicolin's comments
- merge plain setting.

 sound/soc/fsl/fsl_esai.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index 3623aa9a6f2e..f2e7b27f8447 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -218,7 +218,7 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
 {
 	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
 	struct clk *clksrc = esai_priv->extalclk;
-	bool tx = clk_id <= ESAI_HCKT_EXTAL;
+	bool tx = (clk_id <= ESAI_HCKT_EXTAL || esai_priv->synchronous);
 	bool in = dir == SND_SOC_CLOCK_IN;
 	u32 ratio, ecr = 0;
 	unsigned long clk_rate;
@@ -253,7 +253,7 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
 		ecr |= ESAI_ECR_ETI;
 		/* fall through */
 	case ESAI_HCKR_EXTAL:
-		ecr |= ESAI_ECR_ERI;
+		ecr |= esai_priv->synchronous ? ESAI_ECR_ETI : ESAI_ECR_ERI;
 		break;
 	default:
 		return -EINVAL;
@@ -537,10 +537,18 @@ static int fsl_esai_hw_params(struct snd_pcm_substream *substream,
 
 	bclk = params_rate(params) * slot_width * esai_priv->slots;
 
-	ret = fsl_esai_set_bclk(dai, tx, bclk);
+	ret = fsl_esai_set_bclk(dai, esai_priv->synchronous || tx, bclk);
 	if (ret)
 		return ret;
 
+	mask = ESAI_xCR_xSWS_MASK;
+	val = ESAI_xCR_xSWS(slot_width, width);
+
+	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), mask, val);
+	/* Recording in synchronous mode needs to set TCR also */
+	if (!tx && esai_priv->synchronous)
+		regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR, mask, val);
+
 	/* Use Normal mode to support monaural audio */
 	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
 			   ESAI_xCR_xMOD_MASK, params_channels(params) > 1 ?
@@ -556,10 +564,9 @@ static int fsl_esai_hw_params(struct snd_pcm_substream *substream,
 
 	regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), mask, val);
 
-	mask = ESAI_xCR_xSWS_MASK | (tx ? ESAI_xCR_PADC : 0);
-	val = ESAI_xCR_xSWS(slot_width, width) | (tx ? ESAI_xCR_PADC : 0);
-
-	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), mask, val);
+	if (tx)
+		regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
+					ESAI_xCR_PADC, ESAI_xCR_PADC);
 
 	/* Remove ESAI personal reset by configuring ESAI_PCRC and ESAI_PRRC */
 	regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC,
-- 
1.9.1