[PATCH] ASoC: fsl_sai: Enable MCTL_MCLK_EN bit for master mode

[Shengjiu Wang]

On Thu, Jul 6, 2023 at 7:08 PM Fabio Estevam <festevam at gmail.com> wrote:

> Hi Andreas,
>
> On Thu, Jul 6, 2023 at 5:47 AM Andreas Henriksson <andreas at fatal.se>
> wrote:
>
> > We've been working on an i.MX8MP where MCLK needs to be input and found
> > that this enables the MCLK as output despite not having set the
> > `fsl,sai-mclk-direction-output;` devicetree property in our DT.
> > Reverting the patch fixes the issues for us.
> >
> > I have to say that the code comment made me a bit confused, but once
> > I found the commit message I understood why this code existed.
> > If this is really i.MX8MM specific maybe mention that in the code
> > comment and please make the code actually only trigger on i.MX8MM.
> > It seems to me like these all fulfill the current criteria:
> > imx7ulp, imx8mq, imx8mm, imx8mp, imx8ulp, imx93
> >
> > Should I report this in bugzilla.kernel.org ?
>
> Should we do a fix like this?
>
> --- a/sound/soc/fsl/fsl_sai.c
> +++ b/sound/soc/fsl/fsl_sai.c
> @@ -1453,7 +1453,7 @@ static int fsl_sai_probe(struct platform_device
> *pdev)
>
>         /* Select MCLK direction */
>         if (sai->mclk_direction_output &&
> -           sai->soc_data->max_register >= FSL_SAI_MCTL) {
> +           sai->soc_data->max_register >= FSL_SAI_MCTL &&
> sai->mclk_direction_output) {
>                 regmap_update_bits(sai->regmap, FSL_SAI_MCTL,
>                                    FSL_SAI_MCTL_MCLK_EN,
> FSL_SAI_MCTL_MCLK_EN);
>         }
>

No, this is the code in probe().
The code with the issue is in fsl_sai_set_bclk().

The clean way for fixing is to remove the code in fsl_sai_set_bclk()
and add "fsl,sai-mclk-direction-output;" property in dts for some
node.

best regards
wang shengjiu
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