[PATCH] ASoC: fsl_sai: fix 1:1 bclk:mclk ratio support

[Shengjiu Wang]

On Tue, Apr 5, 2022 at 11:58 PM Ahmad Fatoum <a.fatoum at pengutronix.de>
wrote:

> Refactoring in commit a50b7926d015 ("ASoC: fsl_sai: implement 1:1
> bclk:mclk ratio support") led to the bypass never happening
> as (ratio = 1) was caught in the existing if (ratio & 1) continue;
> check. The correct check sequence instead is:
>
>  - skip all ratios lower than one and higher than 512
>  - skip all odd ratios except for 1:1
>  - skip 1:1 ratio if and only if !support_1_1_ratio
>
> And for all others, calculate the appropriate divider. Adjust the
> code to facilitate this.
>
> Fixes: a50b7926d015 ("ASoC: fsl_sai: implement 1:1 bclk:mclk ratio
> support")
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
>

Acked-by: Shengjiu Wang <shengjiu.wang at gmail.com>

Best regards
Wang shengjiu


> ---
>  sound/soc/fsl/fsl_sai.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> index a992d51568cc..50c377f16097 100644
> --- a/sound/soc/fsl/fsl_sai.c
> +++ b/sound/soc/fsl/fsl_sai.c
> @@ -372,7 +372,7 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai,
> bool tx, u32 freq)
>                         continue;
>                 if (ratio == 1 && !support_1_1_ratio)
>                         continue;
> -               else if (ratio & 1)
> +               if ((ratio & 1) && ratio > 1)
>                         continue;
>
>                 diff = abs((long)clk_rate - ratio * freq);
> --
> 2.30.2
>
>