From d830e27dac26b4f084c5ed2282666527f90db0ed Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Mon, 17 Aug 2015 16:26:21 -0700
Subject: [PATCH] hwmon: (pmbus) Enable PEC if the controller supports it
PMBus controllers optionally support PEC. Configure the driver
to use it if available to improve operational security.
Suggested-by: Michael Jones <mike@proclivis.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/pmbus/pmbus_core.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 398198140b81..ba59eaef2e07 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -1751,6 +1751,11 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
}
}
+ /* Enable PEC if the controller supports it */
+ ret = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
+ if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK))
+ client->flags |= I2C_CLIENT_PEC;
+
pmbus_clear_faults(client);
if (info->identify) {
--
2.34.1