[FAQ] AM62A7: AM62A7 VTM thermal shutdown based on which temperature zone temperature？

Hello XUE Fadong,

Please see the device tree for AM62A for the temperature trip points: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi?h=ti-linux-6.1.y

The type="critical" means that the device will shutdown at that temperature point: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi?h=ti-linux-6.1.y

Best Regards,

Anshu

Hello ,Anshu

    I want to know the temperature basis of the VTM hardware module.

Hi XUE Fadong,

Apologies for the delay. Let me loop in the hardware team to comment.

Best Regards,

Anshu

Hello Hi XUE Fadong,

Please refer the below FAQ for the temp sensor location and the thermal shutdown behavior.

e2e.ti.com/.../faq-am625-am623-am62a-am62p-design-recommendations-custom-board-hardware-design-vtm

Fadong XUE Fadong XUE said:

I want to know the temperature basis of the VTM hardware module.

The basis for selection of the trip threshold (temperature) is customer use case, and any thermal simulations that may have been performed.

You need to consider the below

Guaranteed accuracy of internal temperature sensor
+/- 5 deg C is the guaranteed temperature.

Regards,

Sreenivasa 

Hello，Sreenivasa 

    Thank you for your response！

    The VTM hardware module has a maximum temperature threshold setting, which will trigger a thermal restart when the upper limit is reached. There are three temperature zones on the chip, and I would like to know which temperature zone the VTM hardware module is monitoring to ultimately trigger a thermal restart.

Hello Hi XUE Fadong,

Thank you.

Fadong XUE Fadong XUE said:

The VTM hardware module has a maximum temperature threshold setting, which will trigger a thermal restart when the upper limit is reached.

This needs to be configured.

Fadong XUE Fadong XUE said:

There are three temperature zones on the chip, and I would like to know which temperature zone the VTM hardware module is monitoring to ultimately trigger a thermal restart.

I guess you should be able to configure any or all of the sensors. Let me check on this.

Regards,

Sreenivasa

Hello Hi XUE Fadong,

Anshu Madwesh said:

The type="critical" means that the device will shutdown at that temperature point: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi?h=ti-linux-6.1.y

Looks like any or all of the sensors can be configured. 

Regards,

Sreenivasa

Hello，Sreenivasa

    I understand the configuration you mentioned, but DTS is configured with a thermal shutdown mechanism on Linux. I would like to know the thermal shutdown mechanism on the VTM hardware module. As discussed below:

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1367826/am625-linux-thermal-shut-down/5231873?tisearch=e2e-sitesearch&keymatch=VTM%2525252525252520Thermal%2525252525252520Alert%2525252525252520Reset#5231873

    I don't seem to have found any temperature zones for VTM hardware module monitoring.

Hello Xue Fadong,

Fadong XUE Fadong XUE said:

I would like to know the thermal shutdown mechanism on the VTM hardware module. As discussed below:

You can go through the section 6.3.5.4 of AM62A TRM to get more details on how the VTM module can issue an SoC reset. 

Regards,

Nihar Potturu. 

Hello，Nihar Potturu

    Thank you for your response！

    I am unable to retrieve the reset based on which temperature zone from that document. What specific temperature zone does device temperature refer to? There are three temperature zones on SOC.

Hello,Sreenivasa

   Thank you for your help! This solved my problem.