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Subject[PATCH v7 7/7] drivers/i2c: Add bus recovery for FSI algorithm
Date
From: "Edward A. James" <eajames@us.ibm.com>

Bus recovery should reset the engine and force clock the bus 9 times
to recover most situations.

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

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index f309267..52a662c 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -621,6 +621,24 @@ static u32 fsi_i2c_functionality(struct i2c_adapter *adap)
| I2C_FUNC_SMBUS_EMUL | 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,
@@ -663,6 +681,7 @@ 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),
--
1.8.3.1
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