[PATCH RESEND v2 3/5] thermal/drivers/mediatek/lvts: Disable low offset IRQ for minimum threshold

[Daniel Lezcano]

On 13/01/2025 14:27, Nícolas F. R. A. Prado wrote:
> In order to get working interrupts, a low offset value needs to be
> configured. The minimum value for it is 20 Celsius, which is what is
> configured when there's no lower thermal trip (ie the thermal core
> passes -INT_MAX as low trip temperature). However, when the temperature
> gets that low and fluctuates around that value it causes an interrupt
> storm.

Is it really about an irq storm or about having a temperature threshold 
set close to the ambiant temperature. So leading to unnecessary wakeups 
as there is need for mitigation ?

> Prevent that interrupt storm by not enabling the low offset interrupt if
> the low threshold is the minimum one.

The case where the high threshold is the INT_MAX should be handled too. 
The system may have configured a thermal zone without critical trip 
points, so setting the next upper threshold will program the register 
with INT_MAX. I guess it is an undefined behavior in this case, right ?


> Cc: stable at vger.kernel.org

[ ... ]


-- 
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog