Linux/AM5728: Thermal issue

xiaoyan Chi

Part Number: AM5728
Other Parts Discussed in Thread: TMP102

Tool/software: Linux

Hi,

We had a problem recently when booting the linux.

[ 4.510291] thermal thermal_zone5: critical temperature reached(112 C),shutting down
[ 4.518152] tmp102 0-0048: initialized
[ 4.521960] reboot: Failed to start orderly shutdown: forcing the issue
[ 4.528713] Emergency Sync complete
[ 4.534168] reboot: Power down

I try to check freq of cpu:cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

But there is no file "cpufreq" in cpu0

Our app is using dual-a15 cores.So we want to disable iva and gpu to reducing power consumption.

over 7 years ago

0 xiaoyan Chi over 7 years ago

Expert 1395 points

Hi,
I check :processors.wiki.ti.com/.../Linux_Core_Power_Management_User's_Guide_(v4.4)
I 've successfully done "cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq"
Now how can I disable iva and gpu to reducing power consumption?

0 Pavel Botev over 7 years ago in reply to xiaoyan Chi

TI__Guru**** 170625 points

Hi Bulabula,

For how to disable unused cores (IVA, GPU), refer to the below e2e threads:

e2e.ti.com/.../655090
e2e.ti.com/.../573444

Regards,
Pavel

0 xiaoyan Chi over 7 years ago in reply to Pavel Botev

Expert 1395 points

Hi,
Thanks,Pavel.
I know how to stop dsp , iva , gpu in linux kernel(in dts).
Another question is how to do that in uboot ?

0 xiaoyan Chi over 7 years ago in reply to Pavel Botev

Expert 1395 points

Hi,Pavel
Could we config the critical temperature more than 90 .And what is the max temperture , 125 ?
&cpu_alert0 {
temperature = <80000>; /* milliCelsius */
};

&cpu_crit {
temperature = <90000>; /* milliCelsius */
};

&gpu_crit {
temperature = <90000>; /* milliCelsius */
};

&core_crit {
temperature = <90000>; /* milliCelsius */
};

&dspeve_crit {
temperature = <90000>; /* milliCelsius */
};

&iva_crit {
temperature = <90000>; /* milliCelsius */
};

0 Pavel Botev over 7 years ago in reply to xiaoyan Chi

TI__Guru**** 170625 points

bulabula_yan said:
Another question is how to do that in uboot ?

DSP1, DSP2, IVA and GPU are disabled (stopped) by default in AM57x TI PSDK v4.03 u-boot-2017.01

You can verify that checking the below registers values in the u-boot prompt:

DSP1:

CM_DSP1_CLKSTCTRL
CM_DSP1_DSP1_CLKCTRL
PM_DSP1_PWRSTCTRL
PM_DSP1_PWRSTST

DSP2:

CM_DSP2_CLKSTCTRL
CM_DSP2_DSP2_CLKCTRL
PM_DSP2_PWRSTCTRL
PM_DSP2_PWRSTST

IVA:

CM_IVA_CLKSTCTRL
CM_IVA_IVA_CLKCTRL
CM_IVA_SL2_CLKCTRL
PM_IVA_PWRSTCTRL
PM_IVA_PWRSTST

GPU:

CM_GPU_CLKSTCTRL
CM_GPU_GPU_CLKCTRL
PM_GPU_PWRSTCTRL
PM_GPU_PWRSTST

Regards,
Pavel

0 Pavel Botev over 7 years ago in reply to xiaoyan Chi

TI__Guru**** 170625 points

bulabula_yan said:
Could we config the critical temperature more than 90 .And what is the max temperture , 125 ?
&cpu_alert0 {
temperature = <80000>; /* milliCelsius */
};

&cpu_crit {
temperature = <90000>; /* milliCelsius */
};

&gpu_crit {
temperature = <90000>; /* milliCelsius */
};

&core_crit {
temperature = <90000>; /* milliCelsius */
};

&dspeve_crit {
temperature = <90000>; /* milliCelsius */
};

&iva_crit {
temperature = <90000>; /* milliCelsius */
};

There are two temperature type of AM572x devices: commercial (max temp is 90C) and extended/industrial (max temp is 105C). For more details refer to AM572x DM, sections:

9.1.2 Device Naming Convention - FIELD PARAMETER T

5.3 Power on Hours (POH) Limits

Table 5-4. Recommended Operating Conditions - Operating junction temperature range

Regards,
Pavel

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Linux/AM5728: Thermal issue