linux-kernel - Re: [PATCH] mmc: renesas_sdhi: add checks for pinctrl_lookup

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Date:   Wed, 23 Oct 2019 17:33:13 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Chuhong Yuan <hslester96@...il.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: renesas_sdhi: add checks for pinctrl_lookup_state

On Mon, Oct 21, 2019 at 04:32:49PM +0200, Ulf Hansson wrote:
> On Fri, 18 Oct 2019 at 15:13, Chuhong Yuan <hslester96@...il.com> wrote:
> >
> > renesas_sdhi_probe misses checks for pinctrl_lookup_state and may miss
> > failures.
> > Add checks for them to fix the problem.
> >
> > Signed-off-by: Chuhong Yuan <hslester96@...il.com>
> > ---
> >  drivers/mmc/host/renesas_sdhi_core.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
> > index d4ada5cca2d1..dc5ad6632df3 100644
> > --- a/drivers/mmc/host/renesas_sdhi_core.c
> > +++ b/drivers/mmc/host/renesas_sdhi_core.c
> > @@ -694,8 +694,13 @@ int renesas_sdhi_probe(struct platform_device *pdev,
> >         if (!IS_ERR(priv->pinctrl)) {
> >                 priv->pins_default = pinctrl_lookup_state(priv->pinctrl,
> >                                                 PINCTRL_STATE_DEFAULT);
> > +               if (IS_ERR(priv->pins_default))
> > +                       return PTR_ERR(priv->pins_default);
> > +
> >                 priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl,
> >                                                 "state_uhs");
> > +               if (IS_ERR(priv->pins_uhs))
> > +                       return PTR_ERR(priv->pins_uhs);
> >         }
> 
> This looks correct to me, as I guess if there is a pinctrl specified
> for device node of the controller, it means that it should be used!?
> 
> I understand that this is only used for those variants that supports
> UHS-I via the renesas_sdhi_start_signal_voltage_switch(). Wolfram, is
> this fine you think?

Well, I don't like to bail out because this error is not fatal for basic
operations. How about releasing priv->pinctrl again with an additional
warning that pinctrl settings are broken and will prevent 1.8v modes?

Opinions?


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