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hwmon: (pmbus) Fix page count auto-detection.

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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>
This commit is contained in:
Dmitry Bazhenov 2018-10-15 14:21:22 +05:00 • committed by Greg Kroah-Hartman
parent 9b359dd99c
commit dff53cf71a
2 changed files with 6 additions and 1 deletions
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2
drivers/hwmon/pmbus/pmbus.c
View file

@ -117,6 +117,8 @@ static int pmbus_identify(struct i2c_client *client,
} else {
info->pages = 1;
}
pmbus_clear_faults(client);
}
if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) {

5
drivers/hwmon/pmbus/pmbus_core.c
View file

@ -1759,7 +1759,10 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
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);