Commit 96fc3a45 authored by Joakim Tjernlund's avatar Joakim Tjernlund Committed by Linus Torvalds
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rtc: fix ds1388 time corruption



The ds1307 driver misreads the ds1388 registers when checking for 12 or 24
hour mode.  Instead of checking the hour register it reads the minute
register.  Therefore the driver thinks minutes >= 40 has the 12HR bit set
and resets the minute register by zeroing the high bits.  This results in
minutes are reset to 0-9, jumping back in time 40 or 50 minutes.  The time
jump is also written back to the RTC.
Signed-off-by: default avatarJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a02875a6
......@@ -777,7 +777,7 @@ static int __devinit ds1307_probe(struct i2c_client *client,
read_rtc:
/* read RTC registers */
tmp = ds1307->read_block_data(ds1307->client, 0, 8, buf);
tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf);
if (tmp != 8) {
pr_debug("read error %d\n", tmp);
err = -EIO;
......@@ -862,7 +862,7 @@ read_rtc:
if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
tmp += 12;
i2c_smbus_write_byte_data(client,
DS1307_REG_HOUR,
ds1307->offset + DS1307_REG_HOUR,
bin2bcd(tmp));
}
......
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