On 25/01/2023 10:50, Amjad Ouled-Ameur wrote:
In mtk_thermal_bank_temperature, return -EAGAIN instead of 0 on the first read of sensor that often are bogus values. Signed-off-by: Michael Kao <michael.kao@xxxxxxxxxxxx> Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> Signed-off-by: Amjad Ouled-Ameur <aouledameur@xxxxxxxxxxxx> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> --- drivers/thermal/mtk_thermal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c index b8e06f6c7c42..e7be450cd40a 100644 --- a/drivers/thermal/mtk_thermal.c +++ b/drivers/thermal/mtk_thermal.c @@ -736,7 +736,7 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank) * not immediately shut down. */ if (temp > 200000) - temp = 0; + temp = -EAGAIN;
Did you try to add a delay between the bank init and the thermal zone device register (eg. 1ms) ?
May be the HW did not have time to initialize and capture a temperature before thermal_zone_device_register() is called (this one calls get_temp) ?
if (temp > max) max = temp;
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