linux-kernel - Re: [PATCH] mmc: core: fix card detection regression

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Date:	Tue, 4 Nov 2014 22:48:45 -0200
From:	Fabio Estevam <festevam@...il.com>
To:	Kristina Martšenko <kristina.martsenko@...il.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Chris Ball <chris@...ntf.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Stefan Wahren <stefan.wahren@...e.com>,
	Michael Heimpold <mhei@...mpold.de>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: core: fix card detection regression

Hi Kristina,

On Tue, Nov 4, 2014 at 10:22 PM, Kristina Martšenko
<kristina.martsenko@...il.com> wrote:
> Since commit 89168b489915 ("mmc: core: restore detect line inversion
> semantics"), the SD card on i.MX28 (and possibly other) devices isn't
> detected and booting stops at:
>
> [    4.120617] Waiting for root device /dev/mmcblk0p3...
>
> This is caused by the MMC_CAP2_CD_ACTIVE_HIGH flag being set incorrectly
> when the host controller doesn't use a GPIO for card detection (but
> instead uses a dedicated pin). In this case mmc_gpiod_request_cd() will
> return before assigning to the gpio_invert variable, leaving the
> variable uninitialized. The variable then gets used to set the flag.
> This patch fixes the issue by making sure gpio_invert is set to false
> when a GPIO isn't used. After this patch, i.MX28 boots fine.
>
> The MMC_CAP2_RO_ACTIVE_HIGH (write protect) flag is also set incorrectly
> for the exact same reason (it uses the same uninitialized variable), so
> this patch fixes that too.
>
> Fixes: 89168b489915 ("mmc: core: restore detect line inversion semantics")
> Reported-by: Stefan Wahren <stefan.wahren@...e.com>
> Signed-off-by: Kristina Martšenko <kristina.martsenko@...il.com>

This fixes mx28 card detection, thanks!

Tested-by: Fabio Estevam <fabio.estevam@...escale.com>
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