linux-kernel - Re: [PATCH] mmc: spi: Fix card detection during probe

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Date:   Mon, 11 Feb 2019 09:27:47 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: spi: Fix card detection during probe

On Sun, Feb 10, 2019 at 6:31 PM Jonathan Neuschäfer
<j.neuschaefer@....net> wrote:

> When using the mmc_spi driver with a card-detect pin, I noticed that the
> card was not detected immediately after probe, but only after it was
> unplugged and plugged back in (and the CD IRQ fired).
>
> The call tree looks something like this:
>
> mmc_spi_probe
>   mmc_add_host
>     mmc_start_host
>       _mmc_detect_change
>         mmc_schedule_delayed_work(&host->detect, 0)
>           mmc_rescan
>             host->bus_ops->detect(host)
>               mmc_detect
>                 _mmc_detect_card_removed
>                   host->ops->get_cd(host)
>                     mmc_gpio_get_cd -> -ENOSYS (ctx->cd_gpio not set)
>   mmc_gpiod_request_cd
>     ctx->cd_gpio = desc
>
> To fix this issue, call mmc_detect_change after the card-detect GPIO/IRQ
> is registered.
>
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>

Seems correct!
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij