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mmc: dw_mmc: fix dw_mci_get_cd 

bf626e5550 ("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>
This commit is contained in:
Zhangfei Gao 2014-01-16 20:48:47 +08:00 committed by Chris Ball
parent 85136b74dc
commit 7cf347bd20
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/mmc/host/dw_mmc.c
View File

@ -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;
}