Re: [PATCH 1/1] thermal/drivers/imx_sc_thermal: return -EAGAIN when SCFW turn off resource

[Daniel Lezcano]

On 12/07/2023 23:05, Frank Li wrote:
> Avoid endless print following message when SCFW turns off resource.
>   [ 1818.342337] thermal thermal_zone0: failed to read out thermal zone (-1)
>
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
>   drivers/thermal/imx_sc_thermal.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
> index 8d6b4ef23746..0533d58f199f 100644
> --- a/drivers/thermal/imx_sc_thermal.c
> +++ b/drivers/thermal/imx_sc_thermal.c
> @@ -58,7 +58,9 @@ static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
>   	hdr->size = 2;
>   
>   	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
> -	if (ret)
> +	if (ret == -EPERM) /* NO POWER */
> +		return -EAGAIN;

Isn't there a chain call somewhere when the resource is turned off, so 
the thermal zone can be disabled?

> +	else if (ret)
>   		return ret;
>   
>   	*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;

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