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Linux/AM5728: Thermal issue

yimin bai34
Genius 4755 points

Part Number: AM5728

Tool/software: Linux

Hi Sir 

we followed the e2e's suggestino to disable DSP function.

first. we cancel all kernel module loading.

and then write relative registers.

after checking below registers , the DSP should be in power-off state

CM_DSP1_CLKSTCTRL = 0x00000003

CM_DSP1_DSP1_CLKCTRL = 0x00070000

PM_DSP1_PWRSTCTRL = 0x003F0000

PM_DSP1_PWRSTST = 0x00000000

CM_DSP2_CLKSTCTRL = 0x00000003

CM_DSP2_DSP2_CLKCTRL = 0x00070000

PM_DSP2_PWRSTCTRL = 0x003F0000

PM_DSP2_PWRSTST = 0x00000000

we execute thermal.sh and found there is no difference between DSP power-off mode and DSP power-on mode (including loading relative modules)

'

please advise

BR

Yimin

  • 0
    TI__Guru**** 161600 points
    Hi Yimin,

    I'll try this on my AM572x EVMs and let you know the result.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    TI__Guru**** 161600 points

    Hi Yimin,

    we cancel all kernel module loading.


    This means removing all dsp entries from dts file, unbinding the firmware and then stopping the clocks from PRCM, right?

    Then dspeve_thermal is the temp sensor for the chip, the thermal information should be there even if the dsp is not loaded.
    When you say:
    we execute thermal.sh and found there is no difference between DSP power-off mode and DSP power-on mode (including loading relative modules)

    Have you compared the values between DSP power-off and DSP Loaded (executing some application). Values should be different.
    When DSP is loaded but not used the voltage is scaled to minimum (see DVFS & ABB in device data manual) and the thermal values should be similar to when DSP is off.

    Best Regards,
    Yordan