linux-kernel - Re: [PATCH] ASoC: fsl_sai: Add -EPROBE

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Date:   Mon, 10 Aug 2020 16:53:31 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: fsl_sai: Add -EPROBE_DEFER check for regmap init

On Mon, Aug 10, 2020 at 4:02 PM Nicolin Chen <nicoleotsuka@...il.com> wrote:
>
> On Fri, Aug 07, 2020 at 05:14:42PM +0800, Shengjiu Wang wrote:
> > Regmap initialization may return -EPROBE_DEFER for clock
> > may not be ready, so check -EPROBE_DEFER error type before
> > start another Regmap initialization.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > ---
> >  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 a22562f2df47..eb933fe9b6d1 100644
> > --- a/sound/soc/fsl/fsl_sai.c
> > +++ b/sound/soc/fsl/fsl_sai.c
> > @@ -927,7 +927,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
> >                       "bus", base, &fsl_sai_regmap_config);
> >
> >       /* Compatible with old DTB cases */
> > -     if (IS_ERR(sai->regmap))
> > +     if (IS_ERR(sai->regmap) && PTR_ERR(sai->regmap) != -EPROBE_DEFER)
> >               sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
> >                               "sai", base, &fsl_sai_regmap_config);
> >       if (IS_ERR(sai->regmap)) {
>
> In that case, might need a !EPROBE_DEFER check for this
> fallback devm_regmap_init_mmio_clk at "sai" clock too?

No, I think it is ok for this fallback to return directly with
EPROBE_DEFER.

best regards
wang shengjiu