linux-kernel - [PATCH AUTOSEL 6.6 17/38] regulator (max5970): Fix IRQ handler

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Message-ID: <20240207212337.2351-17-sashal@kernel.org>
Date: Wed,  7 Feb 2024 16:23:03 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Patrick Rudolph <patrick.rudolph@...ements.com>,
	Naresh Solanki <naresh.solanki@...ements.com>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	lgirdwood@...il.com
Subject: [PATCH AUTOSEL 6.6 17/38] regulator (max5970): Fix IRQ handler

From: Patrick Rudolph <patrick.rudolph@...ements.com>

[ Upstream commit a3fa9838e8140584a6f338e8516f2b05d3bea812 ]

The max5970 datasheet gives the impression that IRQ status bits must
be cleared by writing a one to set bits, as those are marked with 'R/C',
however tests showed that a zero must be written.

Fixes an IRQ storm as the interrupt handler actually clears the IRQ
status bits.

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
Link: https://msgid.link/r/20240130150257.3643657-1-naresh.solanki@9elements.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/regulator/max5970-regulator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/max5970-regulator.c b/drivers/regulator/max5970-regulator.c
index b56a174cde3d..5c2d49ae332f 100644
--- a/drivers/regulator/max5970-regulator.c
+++ b/drivers/regulator/max5970-regulator.c
@@ -265,7 +265,7 @@ static int max597x_regmap_read_clear(struct regmap *map, unsigned int reg,
 		return ret;
 
 	if (*val)
-		return regmap_write(map, reg, *val);
+		return regmap_write(map, reg, 0);
 
 	return 0;
 }
-- 
2.43.0