linux-kernel - [PATCH 5.16 073/121] hwmon: (pmbus) Clear pmbus fault/warning bits after read

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Message-Id: <20220314112746.160362529@linuxfoundation.org>
Date:   Mon, 14 Mar 2022 12:54:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Vikash Chandola <vikash.chandola@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 073/121] hwmon: (pmbus) Clear pmbus fault/warning bits after read

From: Vikash Chandola <vikash.chandola@...ux.intel.com>

[ Upstream commit 35f165f08950a876f1b95a61d79c93678fba2fd6 ]

Almost all fault/warning bits in pmbus status registers remain set even
after fault/warning condition are removed. As per pmbus specification
these faults must be cleared by user.
Modify hwmon behavior to clear fault/warning bit after fetching data if
fault/warning bit was set. This allows to get fresh data in next read.

Signed-off-by: Vikash Chandola <vikash.chandola@...ux.intel.com>
Link: https://lore.kernel.org/r/20220222131253.2426834-1-vikash.chandola@linux.intel.com
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwmon/pmbus/pmbus_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 776ee2237be2..ac2fbee1ba9c 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -911,6 +911,11 @@ static int pmbus_get_boolean(struct i2c_client *client, struct pmbus_boolean *b,
 		pmbus_update_sensor_data(client, s2);
 
 	regval = status & mask;
+	if (regval) {
+		ret = pmbus_write_byte_data(client, page, reg, regval);
+		if (ret)
+			goto unlock;
+	}
 	if (s1 && s2) {
 		s64 v1, v2;
 
-- 
2.34.1