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authorErik Rosen <erik.rosen@metormote.com>2021-06-09 12:32:05 +0300
committerGuenter Roeck <linux@roeck-us.net>2021-06-17 14:21:46 +0300
commitdbc0860f7a3d43604c380822a456d26ef6f70a06 (patch)
tree918521228b372ed549be2d0292b0cced872a8b63 /drivers/hwmon/pmbus
parentff53b77e1e1bc9fd21e087e37a8444e8559d8d36 (diff)
downloadlinux-dbc0860f7a3d43604c380822a456d26ef6f70a06.tar.xz
hwmon: (pmbus) Add new pmbus flag NO_WRITE_PROTECT
Some PMBus chips respond with invalid data when reading the WRITE_PROTECT register. For such chips, this flag should be set so that the PMBus core driver doesn't use the WRITE_PROTECT command to determine its behavior. Signed-off-by: Erik Rosen <erik.rosen@metormote.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/pmbus')
-rw-r--r--drivers/hwmon/pmbus/pmbus_core.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 01a1ffc74bb6..a5367df1cee8 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2231,9 +2231,11 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
* faults, and we should not try it. Also, in that case, writes into
* limit registers need to be disabled.
*/
- ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT);
- if (ret > 0 && (ret & PB_WP_ANY))
- data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK;
+ if (!(data->flags & PMBUS_NO_WRITE_PROTECT)) {
+ ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT);
+ if (ret > 0 && (ret & PB_WP_ANY))
+ data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK;
+ }
if (data->info->pages)
pmbus_clear_faults(client);