linux-kernel - Re: [PATCH v3 13/16] mmc: tmio: fix never-detected card insertion bug

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Date:   Wed, 7 Feb 2018 20:38:35 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mmc@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v3 13/16] mmc: tmio: fix never-detected card insertion bug

On Thu, Jan 18, 2018 at 01:28:13AM +0900, Masahiro Yamada wrote:
> The TMIO mmc cannot detect the card insertion in native_hotplug mode
> if the driver is probed without a card inserted.
> 
> The reason is obvious; all IRQs are disabled by tmio_mmc_host_probe(),
> as follows:
> 
>   tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
> 
> The card event IRQs are first enabled by tmio_mmc_start_command() as
> follows:
> 
>   if (!host->native_hotplug)
>           irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
>   tmio_mmc_enable_mmc_irqs(host, irq_mask);
> 
> If the driver is probed without a card, tmio_mmc_start_command() is
> never called in the first place.  So, the card is never detected.
> 
> The card event IRQs must be enabled in probe/resume functions.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>


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