Re: [PATCH 2/3] hwmon: (max31760) Leave standby mode at probe

[Guenter Roeck]

On Sun, Nov 08, 2026 at 03:59:54AM +0000, Stanislav Aleksandrov wrote:
> The driver never clears the standby bit (CR2_STBY) during probe.
> While max31760_resume() clears this bit on resume, probe only
> configured CR2_ALERTS.
> 
> If the chip was left in standby (for example, by boot firmware or a
> previously running OS before a warm reboot), it remains in standby:
> temperature sensing, fan speed counting, and PWM output are halted.
> This occurs on the Samsung Galaxy XR, where the bootloader places the
> chip in standby during boot.
> 
> Clear CR2_STBY alongside setting CR2_ALERTS in probe.
> 
> Fixes: 38b04ad02d0d ("drivers: hwmon: Add max31760 fan speed controller driver")
> Signed-off-by: Stanislav Aleksandrov <lightofmysoul@xxxxxxxxx>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/max31760.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/max31760.c b/drivers/hwmon/max31760.c
> index e3d86dc4257e..e967555a21af 100644
> --- a/drivers/hwmon/max31760.c
> +++ b/drivers/hwmon/max31760.c
> @@ -533,8 +533,9 @@ static int max31760_probe(struct i2c_client *client)
>  
>  	dev_set_drvdata(dev, state);
>  
> -	/* Set alert output to comparator mode */
> -	ret = regmap_set_bits(state->regmap, REG_CR2, CR2_ALERTS);
> +	/* Leave standby mode, set alert output to comparator mode */
> +	ret = regmap_update_bits(state->regmap, REG_CR2, CR2_STBY | CR2_ALERTS,
> +				 CR2_ALERTS);
>  	if (ret)
>  		return dev_err_probe(dev, ret, "cannot write register\n");
>