[PATCH 1/3] hwmon: pmbus: Reduce clear fault page invocations

[Naresh Solanki <naresh.solanki@9elements.com>]

From: Patrick Rudolph <patrick.rudolph@9elements.com>

Observing I2C traffic revealed consecutive transmission of CLEAR_FAULT
commands. While this doesn't cause issues, it extends driver probe time.

Avoid invoking pmbus_clear_fault_page for virtual registers, as they're
managed by the driver, not the chip.

TEST: Verified using an I2C bus analyzer that only one CLEAR_FAULT
      command is send instead 5 in a row.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 69a4e62b6c8d..cbfabdd69056 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -561,7 +561,8 @@ static bool pmbus_check_register(struct i2c_client *client,
 		rv = pmbus_check_status_cml(client);
 	if (rv < 0 && (data->flags & PMBUS_READ_STATUS_AFTER_FAILED_CHECK))
 		data->read_status(client, -1);
-	pmbus_clear_fault_page(client, -1);
+	if (reg < PMBUS_VIRT_BASE)
+		pmbus_clear_fault_page(client, -1);
 	return rv >= 0;
 }
 

base-commit: fc8df28be7155ddcf8731b4c85fd3372811ba5ac
-- 
2.41.0