Hi,
On Tue, Apr 05 2011, Ohad Ben-Cohen wrote:
> 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@xxxxxxxxxx>
> ---
> drivers/mmc/core/quirks.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/quirks.c b/drivers/mmc/core/quirks.c
> index 1957398..a4c42ed 100644
> --- a/drivers/mmc/core/quirks.c
> +++ b/drivers/mmc/core/quirks.c
> @@ -66,6 +66,8 @@ static const struct mmc_fixup mmc_fixup_methods[] = {
> remove_quirk, MMC_QUIRK_BROKEN_CLK_GATING },
> { SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271,
> add_quirk, MMC_QUIRK_NONSTD_FUNC_IF },
> + { SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271,
> + add_quirk, MMC_QUIRK_DISABLE_CD },
> { 0 }
> };
Thanks, pushed to mmc-next for .40.
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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