[PATCH V2] ASoC: fsl_esai: Support synchronous mode

[Nicolin Chen]

This looks better :)

On Wed, Apr 03, 2019 at 10:07:40AM +0000, S.j. Wang wrote:
> @@ -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 */

Btw, I am also wondering if the fall through here is a bug....
Because I don't recall that there is a specific reason to fall
through here. Can you please help confirm? Perhaps we need to
submit a separate fix as well by replacing it with a "break;".

>  	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);

Mind aligning the indentation here like the one below?
		regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
				   ESAI_xCR_PADC, ESAI_xCR_PADC);

Once you fix the indentation, add this:

Acked-by: Nicolin Chen <nicoleotsuka at gmail.com>

Thanks