[alsa-devel] [PATCH] ASoC: fsl_esai: Clear the xPM bit when using xFP

[Nicolin Chen]

On Sat, Apr 07, 2018 at 03:02:21PM +0200, Marek Vasut wrote:
> When setting xFP directly, set the xPM predivider to 1, otherwise
> it could remain set to previously set incorrect value and interfere
> with the correct clocking.

This doesn't sound right to me. Could you please provide a failed
instance? It's been a while since I wrote the code. But I can tell
that PM is supposed to be called by set_sysclk() only, while FP is
used for bclk. If you clear PM when setting FP, the output of HCK
could be messed.

Thanks
Nicolin

> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Fabio Estevam <fabio.estevam at nxp.com>
> Cc: Gustavo A. R. Silva <garsilva at embeddedor.com>
> Cc: Mark Brown <broonie at kernel.org>
> ---
>  sound/soc/fsl/fsl_esai.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
> index 40a700493f4c..9f69823b50d7 100644
> --- a/sound/soc/fsl/fsl_esai.c
> +++ b/sound/soc/fsl/fsl_esai.c
> @@ -128,8 +128,11 @@ static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
>  
>  	maxfp = usefp ? 16 : 1;
>  
> -	if (usefp && fp)
> +	if (usefp && fp) {
> +		regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
> +				   ESAI_xCCR_xPM_MASK, 0);
>  		goto out_fp;
> +	}
>  
>  	if (ratio > 2 * 8 * 256 * maxfp || ratio < 2) {
>  		dev_err(dai->dev, "the ratio is out of range (2 ~ %d)\n",
> -- 
> 2.16.2
> 
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