[PATCH] mmc: core: fix card detection regression

Ulf Hansson ulf.hansson at linaro.org
Wed Nov 5 01:30:29 PST 2014

On 5 November 2014 01:22, Kristina Martšenko
<kristina.martsenko at gmail.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 at i2se.com>
> Signed-off-by: Kristina Martšenko <kristina.martsenko at gmail.com>

Thanks! Applied for fixes.

Kind regards

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