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mmc: core: fix using wrong io voltage if mmc_select_hs200 fails 

Currently MMC core will keep going if HS200/HS timing switch failed
with -EBADMSG error by the assumption that the old timing is still valid.

However, for mmc_select_hs200 case, the signal voltage may have already
been switched. If the timing switch failed, we should fall back to
the old voltage in case the card is continue run with legacy timing.

If fall back signal voltage failed, we explicitly report an EIO error
to force retry during the next power cycle.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Dong Aisheng 2016-04-21 00:51:30 +08:00 committed by Ulf Hansson
parent 802ac39a55
commit e51534c806
1 changed files with 9 additions and 3 deletions
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12
drivers/mmc/core/mmc.c
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@ -1244,10 +1244,11 @@ static int mmc_select_hs200(struct mmc_card *card)
{
struct mmc_host *host = card->host;
bool send_status = true;
unsigned int old_timing;
unsigned int old_timing, old_signal_voltage;
int err = -EINVAL;
u8 val;
old_signal_voltage = host->ios.signal_voltage;
if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
@ -1256,7 +1257,7 @@ static int mmc_select_hs200(struct mmc_card *card)
/* If fails try again during next card power cycle */
if (err)
goto err;
return err;
mmc_select_driver_type(card);
@ -1290,9 +1291,14 @@ static int mmc_select_hs200(struct mmc_card *card)
}
}
err:
if (err)
if (err) {
/* fall back to the old signal voltage, if fails report error */
if (__mmc_set_signal_voltage(host, old_signal_voltage))
err = -EIO;
pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
__func__, err);
}
return err;
}