mmc: dw_mmc: fix dw_mci_get_cd

bf626e5550f24aec ("mmc: dw_mmc: use slot-gpio to handle cd pin") caused
CDETECT to be ignored, since negated return value of mmc_gpio_get_cd(mmc)
can not be checked by IS_ERR_VALUE.

Also, add spin_lock_bh(&host->lock) for atomic access to
DW_MMC_CARD_PRESENT, otherwise sd detect may occasionally fail.

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reported-by: Kevin Hilman <khilman@linaro.org>
Reviewed-by: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index a776f24..55cd110 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1033,7 +1033,8 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
        int present;
        struct dw_mci_slot *slot = mmc_priv(mmc);
        struct dw_mci_board *brd = slot->host->pdata;
-       int gpio_cd = !mmc_gpio_get_cd(mmc);
+       struct dw_mci *host = slot->host;
+       int gpio_cd = mmc_gpio_get_cd(mmc);
 
        /* Use platform get_cd function, else try onboard card detect */
        if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
@@ -1041,11 +1042,12 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
        else if (brd->get_cd)
                present = !brd->get_cd(slot->id);
        else if (!IS_ERR_VALUE(gpio_cd))
-               present = !!gpio_cd;
+               present = gpio_cd;
        else
                present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
                        == 0 ? 1 : 0;
 
+       spin_lock_bh(&host->lock);
        if (present) {
                set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
                dev_dbg(&mmc->class_dev, "card is present\n");
@@ -1053,6 +1055,7 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
                clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
                dev_dbg(&mmc->class_dev, "card is not present\n");
        }
+       spin_unlock_bh(&host->lock);
 
        return present;
 }
@@ -2081,7 +2084,7 @@ static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
        return gpio;
 }
 
-/* find the cd gpio for a given slot; or -1 if none specified */
+/* find the cd gpio for a given slot */
 static void dw_mci_of_get_cd_gpio(struct device *dev, u8 slot,
                                        struct mmc_host *mmc)
 {
@@ -2411,6 +2414,9 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
        if (of_find_property(np, "caps2-mmc-hs200-1_2v", NULL))
                pdata->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
 
+       if (of_get_property(np, "cd-inverted", NULL))
+               pdata->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+
        return pdata;
 }