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 }
};
--
1.7.1
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