linux-kernel - Re: [PATCH v2 16/22] mmc: tmio: fix never-detected card insertion bug

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Date:   Sat, 13 Jan 2018 21:59:38 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v2 16/22] mmc: tmio: fix never-detected card insertion bug

> I am talking about the card detection
> by the IP-builtin circuit.

Yes, I know. As I wrote in one of the previous patches when reviewing
it, I disabled GPIO CD and used the internal mechanism (for tests where
it is relevant). Like here, too.

>  - GPIO is not set up                     -> mmc_gpio_get_cd() returns -ENOSYS

Thanks! That pointed me to the right direction. I missed that patch
10/22 was still under discussion and not applied to mmc/next, so I had
to pick it manually.

I can confirm now that there is an issue and your patch fixes it for the
non-GPIO case. For the GPIO case, however, the TMIO_STAT_CARD_REMOVE |
TMIO_STAT_CARD_INSERT interrupts are enabled now, too. It didn't harm
when doing my tests, but we shouldn't do it, to be safe IMO.

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