Currently when card type supports EXT_CSD_CARD_TYPE_DDR_1_8V which means it can work on DDR mode with either 3.3v IO or 1.8v IO voltage. MMC core will first try 1.8v then 3.3v if host claims MMC_CAP_1_8V_DDR support. However the host driver voltage switch code does not check NO_1_8_V quirk which may set a wrong 1.8v and causes the card fixed to 3.3v VIO un-work. Checking 1.8V quirk before setting it to avoid such issue. CC: stable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx> --- drivers/mmc/host/sdhci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 2338aab..96ccb15 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1683,6 +1683,8 @@ static int sdhci_do_signal_voltage_switch(struct sdhci_host *host, return -EAGAIN; case MMC_SIGNAL_VOLTAGE_180: + if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) + return -EINVAL; /* * Enable 1.8V Signal Enable in the Host Control2 * register -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
