linux-kernel - [PATCH v2 2/3] hwmon: (pmbus/core) clear faults after setting smbalert mask

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Message-Id: <20240920-tps25990-v2-2-f3e39bce5173@baylibre.com>
Date: Fri, 20 Sep 2024 18:56:13 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Jerome Brunet <jbrunet@...libre.com>, 
 Jonathan Corbet <corbet@....net>, 
 Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>, 
 Naresh Solanki <naresh.solanki@...ements.com>, 
 Patrick Rudolph <patrick.rudolph@...ements.com>
Cc: linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-i2c@...r.kernel.org
Subject: [PATCH v2 2/3] hwmon: (pmbus/core) clear faults after setting
 smbalert mask

pmbus_write_smbalert_mask() ignores the errors if the chip can't set
smbalert mask the standard way. It is not necessarily a problem for the irq
support if the chip is otherwise properly setup but it may leave an
uncleared fault behind.

pmbus_core will pick the fault on the next register_check(). The register
check will fails regardless of the actual register support by the chip.

This leads to missing attributes or debugfs entries for chips that should
provide them.

We cannot rely on register_check() as PMBUS_SMBALERT_MASK may be read-only.

Unconditionally clear the page fault after setting PMBUS_SMBALERT_MASK to
avoid the problem.

Suggested-by: Guenter Roeck <linux@...ck-us.net>
Fixes: 221819ca4c36 ("hwmon: (pmbus/core) Add interrupt support")
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 0ea6fe7eb17c..a16cb527e71b 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -3268,7 +3268,12 @@ static int pmbus_regulator_notify(struct pmbus_data *data, int page, int event)
 
 static int pmbus_write_smbalert_mask(struct i2c_client *client, u8 page, u8 reg, u8 val)
 {
-	return _pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8));
+	int ret;
+
+	ret = _pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8));
+	pmbus_clear_fault_page(client, -1);
+
+	return ret;
 }
 
 static irqreturn_t pmbus_fault_handler(int irq, void *pdata)

-- 
2.45.2