linux-kernel - [PATCH] ina3221: Fix shunt sum critical calculation

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Message-ID: <20221108044508.23463-1-nmalwade@nvidia.com>
Date:   Tue, 8 Nov 2022 12:45:08 +0800
From:   Ninad Malwade <nmalwade@...dia.com>
To:     <nmalwade@...dia.com>, <treding@...dia.com>,
        <jonathanh@...dia.com>, <linux@...ck-us.net>, <jdelvare@...e.com>,
        <nicolinc@...dia.com>, <rkasirajan@...dia.com>
CC:     <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>
Subject: [PATCH] ina3221: Fix shunt sum critical calculation

The shunt sum critical limit register value should be left shifted
by one bit as its LSB-0 is a reserved bit.

Signed-off-by: Ninad Malwade <nmalwade@...dia.com>
---
 drivers/hwmon/ina3221.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
index 2a57f4b60c29..e06186986444 100644
--- a/drivers/hwmon/ina3221.c
+++ b/drivers/hwmon/ina3221.c
@@ -228,7 +228,7 @@ static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
 	 * Shunt Voltage Sum register has 14-bit value with 1-bit shift
 	 * Other Shunt Voltage registers have 12 bits with 3-bit shift
 	 */
-	if (reg == INA3221_SHUNT_SUM)
+	if (reg == INA3221_SHUNT_SUM || reg == INA3221_CRIT_SUM)
 		*val = sign_extend32(regval >> 1, 14);
 	else
 		*val = sign_extend32(regval >> 3, 12);
@@ -465,7 +465,7 @@ static int ina3221_write_curr(struct device *dev, u32 attr,
 	 *     SHUNT_SUM: (1 / 40uV) << 1 = 1 / 20uV
 	 *     SHUNT[1-3]: (1 / 40uV) << 3 = 1 / 5uV
 	 */
-	if (reg == INA3221_SHUNT_SUM)
+	if (reg == INA3221_SHUNT_SUM || reg == INA3221_CRIT_SUM)
 		regval = DIV_ROUND_CLOSEST(voltage_uv, 20) & 0xfffe;
 	else
 		regval = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
-- 
2.17.1