From d830e27dac26b4f084c5ed2282666527f90db0ed Mon Sep 17 00:00:00 2001 From: Guenter Roeck 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 Signed-off-by: Guenter Roeck --- 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) { -- 2.11.0