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From:   Eddie James <eajames@linux.vnet.ibm.com>
To:     linux-i2c@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        wsa@the-dreams.de, robh+dt@kernel.org, benh@kernel.crashing.org,
        joel@jms.id.au, mark.rutland@arm.com, gregkh@linuxfoundation.org,
        rdunlap@infradead.org, andy.shevchenko@gmail.com, peda@axentia.se,
        Eddie James <eajames@linux.vnet.ibm.com>
Subject: [PATCH v10 7/7] i2c: fsi: Add bus recovery
Date:   Wed, 13 Jun 2018 14:36:19 -0500
In-Reply-To: <1528918579-27602-1-git-send-email-eajames@linux.vnet.ibm.com>
References: <1528918579-27602-1-git-send-email-eajames@linux.vnet.ibm.com>
Message-Id: <1528918579-27602-8-git-send-email-eajames@linux.vnet.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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(+)

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),
-- 
1.8.3.1