linux-kernel - Re: [PATCH] ASoC: fsl_xcvr: disable all interrupts when suspend happens

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Date:   Fri, 18 Jun 2021 19:30:25 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Fabio Estevam <festevam@...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>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Mark Brown <broonie@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] ASoC: fsl_xcvr: disable all interrupts when suspend happens

Hi Fabio

On Fri, Jun 18, 2021 at 7:21 PM Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Shengjiu,
>
> On Fri, Jun 18, 2021 at 7:10 AM Shengjiu Wang <shengjiu.wang@....com> wrote:
> >
> > There is an unhandled interrupt after suspend, which cause endless
> > interrupt when system resume, so system may hang.
> >
> > Disable all interrupts in runtime suspend callback to avoid above
> > issue.
>
> Fixe tag?

ok, I will add it.

>
> > +       ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_EXT_IER0,
> > +                                FSL_XCVR_IRQ_EARC_ALL, 0);
> > +       if (ret < 0)
> > +               dev_err(dev, "Failed to clear IER0: %d\n", ret);
> > +
>
> The operations in _suspend() are usually balanced with the ones in _resume().
>
> Shouldn't you enable the interrupts in resume() then?

No,  as you said below, the interrupts are enabled in fsl_xcvr_prepare().
so this change should not block anything.

>
> I see that the interrupts are currently enabled inside fsl_xcvr_prepare().