[v10,7/7] i2c: fsi: Add bus recovery

Message ID 1528918579-27602-8-git-send-email-eajames@linux.vnet.ibm.com
State New
Headers show
Series
  • i2c: Add FSI-attached I2C master algorithm
Related show

Commit Message

Eddie James June 13, 2018, 7:36 p.m.
Bus recovery should reset the engine and force clock the bus 9 times
to recover most situations.

Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com>
---
 drivers/i2c/busses/i2c-fsi.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

Patch

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index d6cab4b..940b198 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -611,6 +611,24 @@  static u32 fsi_i2c_functionality(struct i2c_adapter *adap)
 		I2C_FUNC_SMBUS_BLOCK_DATA;
 }
 
+static int fsi_i2c_recover_bus(struct i2c_adapter *adap)
+{
+	int rc;
+	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_master *master = port->master;
+
+	mutex_lock(&master->lock);
+
+	rc = fsi_i2c_reset(master, port->port);
+
+	mutex_unlock(&master->lock);
+	return rc;
+}
+
+static struct i2c_bus_recovery_info fsi_i2c_bus_recovery_info = {
+	.recover_bus = fsi_i2c_recover_bus,
+};
+
 static const struct i2c_algorithm fsi_i2c_algorithm = {
 	.master_xfer = fsi_i2c_xfer,
 	.functionality = fsi_i2c_functionality,
@@ -653,6 +671,7 @@  static int fsi_i2c_probe(struct device *dev)
 		port->adapter.dev.of_node = np;
 		port->adapter.dev.parent = dev;
 		port->adapter.algo = &fsi_i2c_algorithm;
+		port->adapter.bus_recovery_info = &fsi_i2c_bus_recovery_info;
 		port->adapter.algo_data = port;
 
 		snprintf(port->adapter.name, sizeof(port->adapter.name),