From a5436af598779219b375c1977555c82def1c35d0 Mon Sep 17 00:00:00 2001
From: Brandon Wyman <bjwyman@gmail.com>
Date: Thu, 17 Mar 2022 23:21:23 +0000
Subject: [PATCH] hwmon: (pmbus) Add Vin unit off handling
Git-commit: a5436af598779219b375c1977555c82def1c35d0
Patch-mainline: v5.18-rc1
References: git-fixes
If there is an input undervoltage fault, reported in STATUS_INPUT
command response, there is quite likely a "Unit Off For Insufficient
Input Voltage" condition as well.
Add a constant for bit 3 of STATUS_INPUT. Update the Vin limit
attributes to include both bits in the mask for clearing faults.
If an input undervoltage fault occurs, causing a unit off for
insufficient input voltage, but the unit is off bit is not cleared, the
STATUS_WORD will not be updated to clear the input fault condition.
Including the unit is off bit (bit 3) allows for the input fault
condition to completely clear.
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Link: https://lore.kernel.org/r/20220317232123.2103592-1-bjwyman@gmail.com
Fixes: b4ce237b7f7d3 ("hwmon: (pmbus) Introduce infrastructure to detect sensors and limit registers")
[groeck: Dropped unnecessary ()]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/hwmon/pmbus/pmbus.h | 1 +
drivers/hwmon/pmbus/pmbus_core.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index 38f049d68d32..e74b6ef070f3 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -319,6 +319,7 @@ enum pmbus_fan_mode { percent = 0, rpm };
/*
* STATUS_VOUT, STATUS_INPUT
*/
+#define PB_VOLTAGE_VIN_OFF BIT(3)
#define PB_VOLTAGE_UV_FAULT BIT(4)
#define PB_VOLTAGE_UV_WARNING BIT(5)
#define PB_VOLTAGE_OV_WARNING BIT(6)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 8eed7968a50e..b2618b1d529e 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -1373,7 +1373,7 @@ static const struct pmbus_limit_attr vin_limit_attrs[] = {
.reg = PMBUS_VIN_UV_FAULT_LIMIT,
.attr = "lcrit",
.alarm = "lcrit_alarm",
- .sbit = PB_VOLTAGE_UV_FAULT,
+ .sbit = PB_VOLTAGE_UV_FAULT | PB_VOLTAGE_VIN_OFF,
}, {
.reg = PMBUS_VIN_OV_WARN_LIMIT,
.attr = "max",
--
2.31.1