4.9-stable review patch. If anyone has any objections, please let me know.
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From: Daniel Lezcano daniel.lezcano@linaro.org
commit db2b0332608c8e648ea1e44727d36ad37cdb56cb upstream.
The DT specifies a threshold of 65000, we setup the register with a value in the temperature resolution for the controller, 64656.
When we reach 64656, the interrupt fires, the interrupt is disabled. Then the irq thread runs and calls thermal_zone_device_update() which will call in turn hisi_thermal_get_temp().
The function will look if the temperature decreased, assuming it was more than 65000, but that is not the case because the current temperature is 64656 (because of the rounding when setting the threshold). This condition being true, we re-enable the interrupt which fires immediately after exiting the irq thread. That happens again and again until the temperature goes to more than 65000.
Potentially, there is here an interrupt storm if the temperature stabilizes at this temperature. A very unlikely case but possible.
In any case, it does not make sense to handle dozens of alarm interrupt for nothing.
Fix this by rounding the threshold value to the controller resolution so the check against the threshold is consistent with the one set in the controller.
Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Reviewed-by: Leo Yan leo.yan@linaro.org Tested-by: Leo Yan leo.yan@linaro.org Signed-off-by: Eduardo Valentin edubezval@gmail.com Signed-off-by: Kevin Wangtao kevin.wangtao@hisilicon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/thermal/hisi_thermal.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/thermal/hisi_thermal.c +++ b/drivers/thermal/hisi_thermal.c @@ -90,6 +90,12 @@ static inline long hisi_thermal_temp_to_ return (temp - HISI_TEMP_BASE) / HISI_TEMP_STEP; }
+static inline long hisi_thermal_round_temp(int temp) +{ + return hisi_thermal_step_to_temp( + hisi_thermal_temp_to_step(temp)); +} + static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data, struct hisi_thermal_sensor *sensor) { @@ -245,7 +251,7 @@ static irqreturn_t hisi_thermal_alarm_ir sensor = &data->sensors[data->irq_bind_sensor];
dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n", - sensor->thres_temp / 1000); + sensor->thres_temp); mutex_unlock(&data->thermal_lock);
for (i = 0; i < HISI_MAX_SENSORS; i++) { @@ -284,7 +290,7 @@ static int hisi_thermal_register_sensor(
for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) { if (trip[i].type == THERMAL_TRIP_PASSIVE) { - sensor->thres_temp = trip[i].temperature; + sensor->thres_temp = hisi_thermal_round_temp(trip[i].temperature); break; } }