POWER CONSUMPTION　ADJUSTMENT　INSTRUCTIONS

version1.0

1. Enable/Disable Component¶

1.1. Optional Component¶

Optional components enabled on Infinity-2m: Analog Power, ETH and USB.

1.2. Analog Power¶

According to different application scenarios, the power of the unused simulation circuit can be turned off to achieve the energy-saving goal.

Switchable items

Adjustable items:

Audio/EMAC/HDMI ATOP/IDAC ATOP/IDAC LPLL/DISP LPLL/MIPI DPHY TX TOP/SATA ATOP/UPLL 0,1/USB20 P1,P2,P3

The corresponding kernel config is as follows, you need to close it and set it to y.

# CONFIG_ANALOG_PD_AUDIO is not set

# CONFIG_ANALOG_PD_EMAC is not set

CONFIG_ANALOG_PD_HDMI_ATOP=y

CONFIG_ANALOG_PD_IDAC_ATOP=y

CONFIG_ANALOG_PD_IDAC_LPLL=y

# CONFIG_ANALOG_PD_DISP_LPLL is not set

# CONFIG_ANALOG_PD_MIPI_DPHY_TX_TOP is not set

CONFIG_ANALOG_PD_SATA_ATOP=y

# CONFIG_ANALOG_PD_UPLL_0 is not set

# CONFIG_ANALOG_PD_UPLL_1 is not set

# CONFIG_ANALOG_PD_USB20_P1 is not set

# CONFIG_ANALOG_PD_USB20_P2 is not set

# CONFIG_ANALOG_PD_USB20_P3 is not set

Note: If it is a MIPI panel, MIPI_DPHY cannot be selected.

1.3. ETH¶

Make adjustments to U-Boot and Linux Kernel to completely close the component.

1.3.1. Adjust U-Boot¶

Cancel the option of MSTAR EMAC

1.3.2. Adjust Linux Kernel¶

Cancel the option of EMAC
Cancel the option of networking support

1.4. USB¶

Make adjustments to U-Boot and Linux Kernel to completely close the component.

1.4.1. Adjust U-Boot¶

Cancel the option of MSTAR USB

1.4.2. Adjust Linux Kernel¶

Modify the file linux-4.9/arch/arm/boot/dts/infinity2m.dtsi (adjust status ="disable" to turn off the USB)

2. Component Clock Frequency Config¶

2.1. CPU Clock Frequency Config¶

2.1.1. Voltage Scaling Config¶

Provides the switch of voltage scaling, the default is disabled. Enable it with the following command.
```
echo 1 > /sys/devices/system/cpu/cpufreq/scaling_voltage
```
After it is enabled, the system will automatically switch the voltage according to the current temperature (T). The switching conditions are as follows:
```
T > 60C : VDD= 0.9V

T < 40C : VDD = 1.0V
```

2.1.2. Clock Scaling Config¶

The range of clock scaling can be set through the following commands.

echo s_min > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq    (default 1GHz)

echo s_max > /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq    (default 1GHz)

(note: s_min, s_max unit is khz)

Setting standards:
1. s_min ≤ s_max
2. s_min ≥ /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq
3. s_max ≤ /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq

2.2. Encoding Clock Frequency Config¶

2.2.1. Encoder config Example¶

After mhal.ko is loaded, before starting the video processing task, you can set the relevant frequency through the following commands:

Read the current isp clock rate
```
cat /sys/venc/ven_clock
```
Set venc clock rate
```
echo 384000000 > /sys/venc/ven_clock
```

2.2.2. Encoder Clock Frequency Gear¶

JPE's clock default: 320M

216000000
288000000
320000000

2.2.3. Note¶

The above settings should be set when the module is loaded in order to take effect correctly.

2.3. Observe CPU Temperature¶

cat /sys/devices/virtual/mstar/msys/TEMP_R

The result is for reference only, the error is ±5°.

POWER CONSUMPTION ADJUSTMENT INSTRUCTIONS