mmc: quirks: wl1271 is MMC_QUIRK_DISABLE_CD

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The wl12xx device supports disconnecting the pull-up resistor on
CD/DAT[3] (pin 1) of the card.

Tell SDIO core to disconnect that resistor during card init,
since we don't need it at that point (and anyway all
hosts shall provide pull-up resistors on all data lines DAT[3:0]
as described in section 6 of the SD physical specification).

As a result, this may save some power, but it's also generally healthy
since it prevents both ends from pulling up that pin, which
results in undesirable asymmetric physical bus.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

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Ohad Ben-Cohen 2011-04-05 18:02:26 +03:00 • committed by Chris Ball

parent 2059a02dcb

commit 14e7dc76f2

1 changed files with 2 additions and 0 deletions

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drivers/mmc/core/quirks.c

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