Some circumstances call for virtual pages to expose multiple values
packed into an extended PMBus register in a manner non-compliant with
the PMBus standard. We should not try to set virtual pages on the
device; add a flag so we can avoid doing so.
Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
---
drivers/hwmon/pmbus/pmbus.h | 2 ++
drivers/hwmon/pmbus/pmbus_core.c | 12 ++++++++----
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index cdf3e288e626..0560a8dbcee0 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -367,6 +367,8 @@ enum pmbus_sensor_classes {
#define PMBUS_HAVE_PWM12 BIT(20)
#define PMBUS_HAVE_PWM34 BIT(21)
+#define PMBUS_PAGE_VIRTUAL BIT(31)
+
enum pmbus_data_format { linear = 0, direct, vid };
enum vrm_version { vr11 = 0, vr12, vr13 };
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 55838b69e99a..af7362de405d 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -164,14 +164,18 @@ int pmbus_set_page(struct i2c_client *client, u8 page)
int rv = 0;
int newpage;
- if (page != data->currpage) {
+ if (page == data->currpage)
+ return 0;
+
+ if (!(data->info->func[page] & PMBUS_PAGE_VIRTUAL)) {
rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
if (newpage != page)
- rv = -EIO;
- else
- data->currpage = page;
+ return -EIO;
}
+
+ data->currpage = page;
+
return rv;
}
EXPORT_SYMBOL_GPL(pmbus_set_page);
--
2.11.0
--
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