linux-kernel - [v1,1/1] hwmon: (nct7904) Add to read all of the SMI status registers in probe function.

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Date:   Tue, 12 May 2020 02:25:23 +0000
From:   <Amy.Shih@...antech.com.tw>
To:     <she90122@...il.com>
CC:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <amy.shih@...antech.com.tw>, <oakley.ding@...antech.com.tw>,
        <jia.sui@...antech.com.cn>, <yuechao.zhao@...antech.com.cn>,
        <Hy.Lee@...antech.com.tw>
Subject: [v1,1/1] hwmon: (nct7904) Add to read all of the SMI status registers in probe function.

From: Amy Shih <amy.shih@...antech.com.tw>

When nct7904 power up, it compares current sensor readings within the
default threshold immediately, thus some of SMI status registers would
get non zero values cause the false alarms on first reading. Add to
read all of the SMI status registers in probe function to clear the
alarms.

Signed-off-by: Amy Shih <amy.shih@...antech.com.tw>
---
 drivers/hwmon/nct7904.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
index 571a649..6fb06f7 100644
--- a/drivers/hwmon/nct7904.c
+++ b/drivers/hwmon/nct7904.c
@@ -45,6 +45,7 @@
 #define FANCTL_MAX		4	/* Counted from 1 */
 #define TCPU_MAX		8	/* Counted from 1 */
 #define TEMP_MAX		4	/* Counted from 1 */
+#define SMI_STS_MAX		10	/* Counted from 1 */
 
 #define VT_ADC_CTRL0_REG	0x20	/* Bank 0 */
 #define VT_ADC_CTRL1_REG	0x21	/* Bank 0 */
@@ -1126,6 +1127,13 @@ static int nct7904_probe(struct i2c_client *client,
 		data->fan_mode[i] = ret;
 	}
 
+	/* Read all of SMI status register to clear alarms */
+	for (i = 0; i < SMI_STS_MAX; i++) {
+		ret = nct7904_read_reg(data, BANK_0, SMI_STS1_REG + i);
+		if (ret < 0)
+			return ret;
+	}
+
 	hwmon_dev =
 		devm_hwmon_device_register_with_info(dev, client->name, data,
 						     &nct7904_chip_info, NULL);
-- 
1.8.3.1