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i2c: send STOP after successful bus recovery 

If we managed to get a client release SDA again, send a STOP afterwards
to make sure we have a consistent state on the bus again.

Tested-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2018-01-09 14:58:58 +01:00 committed by Wolfram Sang
parent 72b08fcc15
commit 2806e6ad77
1 changed files with 12 additions and 0 deletions
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12
drivers/i2c/i2c-core-base.c
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@ -199,6 +199,18 @@ int i2c_generic_scl_recovery(struct i2c_adapter *adap)
if (bri->get_sda && !bri->get_sda(adap)) if (bri->get_sda && !bri->get_sda(adap))
ret = -EBUSY; ret = -EBUSY;
/* If all went well, send STOP for a sane bus state. */
if (ret == 0 && bri->set_sda) {
bri->set_scl(adap, 0);
ndelay(RECOVERY_NDELAY / 2);
bri->set_sda(adap, 0);
ndelay(RECOVERY_NDELAY / 2);
bri->set_scl(adap, 1);
ndelay(RECOVERY_NDELAY / 2);
bri->set_sda(adap, 1);
ndelay(RECOVERY_NDELAY / 2);
}
if (bri->unprepare_recovery) if (bri->unprepare_recovery)
bri->unprepare_recovery(adap); bri->unprepare_recovery(adap);