[alsa-devel] [PATCH] ASoC: fsl_esai: Support synchronous mode

[S.j. Wang]

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 at nxp.com>
---
 sound/soc/fsl/fsl_esai.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index 3623aa9a6f2e..d9fcddd55c02 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -230,6 +230,21 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
 		return -EINVAL;
 	}
 
+	if (esai_priv->synchronous && !tx) {
+		switch (clk_id) {
+		case ESAI_HCKR_FSYS:
+			fsl_esai_set_dai_sysclk(dai, ESAI_HCKT_FSYS,
+								freq, dir);
+			break;
+		case ESAI_HCKR_EXTAL:
+			fsl_esai_set_dai_sysclk(dai, ESAI_HCKT_EXTAL,
+								freq, dir);
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
 	/* Bypass divider settings if the requirement doesn't change */
 	if (freq == esai_priv->hck_rate[tx] && dir == esai_priv->hck_dir[tx])
 		return 0;
@@ -537,10 +552,21 @@ 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 ? true : tx, bclk);
 	if (ret)
 		return ret;
 
+	if (esai_priv->synchronous && !tx) {
+		/* Use Normal mode to support monaural audio */
+		regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
+			   ESAI_xCR_xMOD_MASK, params_channels(params) > 1 ?
+			   ESAI_xCR_xMOD_NETWORK : 0);
+
+		mask = ESAI_xCR_xSWS_MASK | ESAI_xCR_PADC;
+		val = ESAI_xCR_xSWS(slot_width, width) | ESAI_xCR_PADC;
+		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 ?
-- 
1.9.1