4.4-stable review patch. If anyone has any objections, please let me know.
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From: Dmitry Bazhenov bazhenov.dn@gmail.com
commit e7c6a55606b5c46b449d76588968b4d8caae903f upstream.
Devices with compatible="pmbus" field have zero initial page count, and pmbus_clear_faults() being called before the page count auto- detection does not actually clear faults because it depends on the page count. Non-cleared faults in its turn may fail the subsequent page count auto-detection.
This patch fixes this problem by calling pmbus_clear_fault_page() for currently set page and calling pmbus_clear_faults() after the page count was detected.
Cc: stable@vger.kernel.org Signed-off-by: Dmitry Bazhenov bazhenov.dn@gmail.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/hwmon/pmbus/pmbus.c | 2 ++ drivers/hwmon/pmbus/pmbus_core.c | 5 ++++- 2 files changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/hwmon/pmbus/pmbus.c +++ b/drivers/hwmon/pmbus/pmbus.c @@ -117,6 +117,8 @@ static int pmbus_identify(struct i2c_cli } else { info->pages = 1; } + + pmbus_clear_faults(client); }
if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) { --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -1759,7 +1759,10 @@ static int pmbus_init_common(struct i2c_ if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK)) client->flags |= I2C_CLIENT_PEC;
- pmbus_clear_faults(client); + if (data->info->pages) + pmbus_clear_faults(client); + else + pmbus_clear_fault_page(client, -1);
if (info->identify) { ret = (*info->identify)(client, info);