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authorWolfram Sang <wsa+renesas@sang-engineering.com>2018-01-09 14:58:58 +0100
committerWolfram Sang <wsa@the-dreams.de>2018-01-16 00:04:42 +0100
commit2806e6ad77c71dd2538cb698aad476e8cf3af004 (patch)
tree78c855e0e041056bcc408b5ba768a511ca273c4a /drivers/i2c
parent72b08fcc15dc6a2d211880e4dc7cf5314e9ab750 (diff)
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/i2c-core-base.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 54cef80990a1..23f353630db3 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);

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