| Message ID | 1389780469-32633-1-git-send-email-zhangfei.gao@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, January 15, 2014, Zhangfei Gao wrote: > Introduced from commit bf626e5550f24aec24975a0e85ad8e572ca76a6b > CDETECT is ignored since negated return value of mmc_gpio_get_cd(mmc) > can not be checked by IS_ERR_VALUE. > Add spin_lock_bh(&host->lock) for atomic accessing 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> > --- > drivers/mmc/host/dw_mmc.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index a776f24f4311..9ded62c8225e 100644 > --- 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; !!gpio_cd or gpio_cd is correct, isn't it? Thanks, Seungwon Jeon > 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) > { > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
On 01/15/2014 07:58 PM, Seungwon Jeon wrote: > On Wed, January 15, 2014, Zhangfei Gao wrote: >> Introduced from commit bf626e5550f24aec24975a0e85ad8e572ca76a6b >> CDETECT is ignored since negated return value of mmc_gpio_get_cd(mmc) >> can not be checked by IS_ERR_VALUE. >> Add spin_lock_bh(&host->lock) for atomic accessing 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> >> --- >> drivers/mmc/host/dw_mmc.c | 9 ++++++--- >> 1 file changed, 6 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >> index a776f24f4311..9ded62c8225e 100644 >> --- 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; > !!gpio_cd or gpio_cd is correct, isn't it? > No, mmc_gpio_get_cd(mmc) has to revert. !!gpio_cd is used before since gpio_cd = !mmc_gpio_get_cd(mmc) is used before. Thanks
On Wed, January 15, 2014, Zhangfei Gao wrote: > On 01/15/2014 07:58 PM, Seungwon Jeon wrote: > > On Wed, January 15, 2014, Zhangfei Gao wrote: > >> Introduced from commit bf626e5550f24aec24975a0e85ad8e572ca76a6b > >> CDETECT is ignored since negated return value of mmc_gpio_get_cd(mmc) > >> can not be checked by IS_ERR_VALUE. > >> Add spin_lock_bh(&host->lock) for atomic accessing 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> > >> --- > >> drivers/mmc/host/dw_mmc.c | 9 ++++++--- > >> 1 file changed, 6 insertions(+), 3 deletions(-) > >> > >> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > >> index a776f24f4311..9ded62c8225e 100644 > >> --- 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; > > !!gpio_cd or gpio_cd is correct, isn't it? > > > > No, mmc_gpio_get_cd(mmc) has to revert. I'm missing something? If card is detected, mmc_gpio_get_cd() returns non-zero, right? I guess gpio_cd should be kept. > !!gpio_cd is used before since gpio_cd = !mmc_gpio_get_cd(mmc) is used > before. > > Thanks > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index a776f24f4311..9ded62c8225e 100644 --- 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) {