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hwmon: (nct7904) Read all SMI status registers in probe function

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When nct7904 power up, it compares current sensor readings against the
default threshold immediately. This results in false alarms on startup.
Read all SMI status registers in probe function to clear the alarms.

Signed-off-by: Amy Shih <amy.shih@advantech.com.tw>
[groeck: Reworded description]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Amy Shih 2020-05-12 02:25:23 +00:00 committed by Guenter Roeck
parent bcb543cc3d
commit 6d44e43f22
1 changed files with 8 additions and 0 deletions
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8
drivers/hwmon/nct7904.c
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@ -41,6 +41,7 @@
#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 */
@ -1009,6 +1010,13 @@ 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);