[PATCH 4.4 022/131] mmc: core: fix using wrong io voltage if mmc_select_hs200 fails

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dong Aisheng <aisheng.dong@xxxxxxx>

commit e51534c806609c806d81bfb034f02737461f855c upstream.

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@xxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/mmc/core/mmc.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1251,10 +1251,11 @@ static int mmc_select_hs200(struct mmc_c
 {
 	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);
 
@@ -1263,7 +1264,7 @@ static int mmc_select_hs200(struct mmc_c
 
 	/* If fails try again during next card power cycle */
 	if (err)
-		goto err;
+		return err;
 
 	mmc_select_driver_type(card);
 
@@ -1297,9 +1298,14 @@ static int mmc_select_hs200(struct mmc_c
 		}
 	}
 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;
 }