From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/i2c-core-base.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 54cef80990a11a..23f353630db32f 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -199,6 +199,18 @@ int i2c_generic_scl_recovery(struct i2c_adapter *adap)
if (bri->get_sda && !bri->get_sda(adap))
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)
bri->unprepare_recovery(adap);
--
2.11.0
