linux-kernel - Re: [PATCH] mmc: mmc_spi: Use proper debounce time for CD GPIO

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Date:   Thu, 14 Nov 2019 13:53:27 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Pavel Machek <pavel@...x.de>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: mmc_spi: Use proper debounce time for CD GPIO

On Fri, 8 Nov 2019 at 17:09, Thierry Reding <thierry.reding@...il.com> wrote:
>
> From: Thierry Reding <treding@...dia.com>
>
> According to the comment, board files used to specify 1 ms for the
> debounce time. gpiod_set_debounce() needs the debounce time to be
> specified in units of microseconds, so make sure to multiply the value
> by 1000.
>
> Note that, according to the git log, the board files actually did
> specify 1 us for bounce times, but that seems really low. Device tree
> bindings for this type of GPIO typically specify the debounce times in
> milliseconds, so setting this default value to 1 ms seems like it would
> be somewhat safer.
>
> Signed-off-by: Thierry Reding <treding@...dia.com>

Applied for next, thanks!

Kind regards
Uffe



> ---
>  drivers/mmc/host/mmc_spi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
> index 66e354d51ee9..74c6cfbf9172 100644
> --- a/drivers/mmc/host/mmc_spi.c
> +++ b/drivers/mmc/host/mmc_spi.c
> @@ -1421,7 +1421,7 @@ static int mmc_spi_probe(struct spi_device *spi)
>          * Index 0 is card detect
>          * Old boardfiles were specifying 1 ms as debounce
>          */
> -       status = mmc_gpiod_request_cd(mmc, NULL, 0, false, 1, NULL);
> +       status = mmc_gpiod_request_cd(mmc, NULL, 0, false, 1000, NULL);
>         if (status == -EPROBE_DEFER)
>                 goto fail_add_host;
>         if (!status) {
> --
> 2.23.0
>