linux-kernel - Re: [PATCH] ASoC: fsl_sai: Enable MCTL_MCLK

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Message-ID: <CAOMZO5CCdaodWQrHUQgMizoES=jfEtw-sNJZG-DJMpRD8tZW9g@mail.gmail.com>
Date:   Thu, 6 Jul 2023 08:08:00 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Andreas Henriksson <andreas@...al.se>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Hans Söderlund <hans.soderlund@...lbit.se>
Subject: Re: [PATCH] ASoC: fsl_sai: Enable MCTL_MCLK_EN bit for master mode

Hi Andreas,

On Thu, Jul 6, 2023 at 5:47 AM Andreas Henriksson <andreas@...al.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);
        }