linux-kernel - Re: [PATCH V2] mmc: sdhci-sprd: Fix no reset data and command after voltage switch

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Message-ID: <CAPDyKFqnCPiN_T8XWs-pz5UO+v+2Cy5YL9p5vJu929rN3SbXcg@mail.gmail.com>
Date:   Thu, 1 Dec 2022 11:48:57 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Wenchao Chen <wenchao.chen@...soc.com>
Cc:     adrian.hunter@...el.com, orsonzhai@...il.com,
        baolin.wang@...ux.alibaba.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 V2] mmc: sdhci-sprd: Fix no reset data and command after
 voltage switch

On Wed, 30 Nov 2022 at 13:14, Wenchao Chen <wenchao.chen@...soc.com> 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>

Applied for fixes and by adding a stable tag, thanks!

Kind regards
Uffe


> ---
> Changelog:
>
> v1 -> v2:
> There is no need to wait for the state of the pin to stabilize.
> ---
>  drivers/mmc/host/sdhci-sprd.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index b92a408f138d..bec3f9e3cd3f 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:
> @@ -498,6 +498,8 @@ static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
>
>         /* Wait for 300 ~ 500 us for pin state stable */
>         usleep_range(300, 500);
> +
> +reset:
>         sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
>
>         return 0;
> --
> 2.17.1
>