ls1043a - should thermal_zone5 be active in the Linux BSP?

[PeterBergin]

I work on with the reference board for ls1043 processor ls1043ardb and having an issue with the thermal subsystem. The error I see is:

 [ 116.704475] thermal thermal_zone5: critical temperature reached (104 C), shutting down

It seems a bit sporadic but when it comes it comes quite soon after boot. It does not come all the time. When the system is stable the temperature from thermal_zone5 is always 0.

The dts file fsl-ls1043a.dtsi have thermal_zone0 - thernal_zone5 active. (fsl-ls1043a.dtsi\freescale\dts\boot\arm64\arch - qoriq-components/linux - Linux Tree for QorIQ suppo... )

The question is if ls1043 should have thermal_zone5 active? Looking in to the "QorIQ LS1043A Reference Manual, Rev. 5, 04/2019" chapter 35.1.1 "Local temperature sensor placement" I can read a table saying that the ls1043 have Temperature sensor ID 0-4 while ID 5-15 is marked as reserved. Is it correct that hte dtsi file enables thermal_zone5 and is it available in ls1043?

Thanks,
/Peter

[yipingwang · Accepted solution]

We acknowledge the issue, currently the values reported by thermal zone 5 are indeterminate and can cause such issue at any random point We will be providing an official fix in our upcoming LSDK releases.

For now you can remove thermal zone 5 from your dtsi  and see if it helps

[ts1234]

I am also facing the similar issue on the latest LSDK 20.12, Kernel 5.4.47. 

[ 2115.927267] thermal thermal_zone1: critical temperature reached (85 C), shutting down
[ 2116.951246] thermal thermal_zone1: critical temperature reached (85 C), shutting down
[ 2117.975285] thermal thermal_zone1: critical temperature reached (85 C), shutting down

Could you please let me know if any workaround is available to fix this?

What is the root cause of this issue?