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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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