linux-kernel - Re: [PATCH] mmc: sdhci-sprd: Fix no reset data and command after voltage switch

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Date:   Wed, 30 Nov 2022 19:58:29 +0800
From:   Wenchao Chen <wenchao.chen666@...il.com>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc:     Wenchao Chen <wenchao.chen@...soc.com>, adrian.hunter@...el.com,
        ulf.hansson@...aro.org, orsonzhai@...il.com, zhang.lyra@...il.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhenxiong.lai@...soc.com, yuelin.tang@...soc.com,
        gengcixi@...il.com
Subject: Re: [PATCH] mmc: sdhci-sprd: Fix no reset data and command after
 voltage switch

On Wed, Nov 30, 2022 at 6:48 PM Baolin Wang
<baolin.wang@...ux.alibaba.com> wrote:
>
>
>
> On 11/30/2022 4:02 PM, Wenchao Chen wrote:
> > After switching the voltage, no reset data and command will cause
> > CMD2 timeout.
> >
> > Fixes: 29ca763fc26f ("mmc: sdhci-sprd: Add pin control support for voltage switch")
> > Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
> > ---
> >   drivers/mmc/host/sdhci-sprd.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> > index b92a408f138d..464508be8ec8 100644
> > --- a/drivers/mmc/host/sdhci-sprd.c
> > +++ b/drivers/mmc/host/sdhci-sprd.c
> > @@ -470,7 +470,7 @@ static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
> >       }
> >
> >       if (IS_ERR(sprd_host->pinctrl))
> > -             return 0;
> > +             goto reset;
> >
> >       switch (ios->signal_voltage) {
> >       case MMC_SIGNAL_VOLTAGE_180:
> > @@ -496,6 +496,7 @@ static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
> >               break;
> >       }
> >
> > +reset:
> >       /* Wait for 300 ~ 500 us for pin state stable */
> >       usleep_range(300, 500);
>
> If no pin state switching, still need stable time? Otherwise looks good
> to me.
>

Thank you for your review. I will update it in the next version.

> >       sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);