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== Operational characteristics ==
The measurement of power consumption of the <code>measurements for [[AURA SOM | AURA SOM</code> ]] are executed with <code>3.3 V</code> power supply.
== Power consumption ==
There are various operating modes available.
'''Attention''': the SOC used does not support the DVFS and therefore the use of the <code>governor</code> present in the Linux kernel, instead of this functionality to scale the performance to have lower consumption by the SOC there is a new technology the <code>Low Drive mode</code>.
* [https://www.nxp.com/docs/en/data-sheet/IMX93CEC.pdf i.MX93 datasheet]
* [https://docs.nxp.com/bundle/AN13917/page/topics/introductionreducing_power_consumption_0.html AN13917: i.MX 93 Reducing the power Consumption]* [https://docs.nxp.com/bundle/AN13917/page/topics/overview_of_imx_93_power_architecture.html AN13917: i.MX 93 Power Consumption MeasurementArchitecture]
There are four operating modes(Not all present by default on <code>Aura SOM</code>):
| -
|-
| Low drive (LD Mode) (1)
| 0.8 V
| 933 MHz
| (3)
|-
| Low drive (LD Mode) (2)
| 0.8 V
| 933 MHz
Note:
* (1): <code>Over drive</code> is the default operating mode.* (2): <code>Over drive</code> can be disabled, see [[#Disable Over drive Mode Device Tree | here]].* (3): <code>Low drive</code> need to activate be activated from <code>device tree</code> by default these are not present, see [[#Enable Low drive Mode Device Tree | here]].
==== Device Tree ====
To enable/disable and configure the driver must use the device tree, must used: by default the node <code>lpm</code> present on <code>arch/arm64/boot/dts/freescale/imx93.dtsi</code> are is disabled, then the <code>Low Drive Mode</code> are disableis disabled.
By default , on <code>Aura SOM</code> the support are enable is enabled with minimal configuration to have:
* <code>Over drive Mode</code>
* <code>Nominal drive Mode</code>
</pre>
The node <code>lpm</code> to change the SOC voltage supply need needs the <code>PMIC buck regulator reference</code> on <code>Aura SOM</code> the PMIC Buck used to power the SOC are the is <code>Buck1</code>.
===== Enable Low drive Mode =====
To enable the two modality modalities <code>Low drive Mode</code> add the property <code>ld-mode-enabled</code> on <code>lpm</code> node of the device tree.
By default on <code>Aura SOM</code> this these modalities are disabled.
'''Attention''': if you want to add this these modalities , properly check if you must change the <code>clock rate</code> of for the other peripherals like:* <code>flexspi1</code> to <code>266000000</code>.* <code>usdhc1</code> to <code>266000000</code>.* <code>usdhc2</code> to <code>266000000</code>.* <code>usdhc3</code> to <code>266000000</code>.
See also the <code>NXP EVK</code> here <code>arch/arm64/boot/dts/freescale/imx93-11x11-evk-ld.dts</code>
The measurements were performed with follow device connected to the board (Only the most energy-intensive devices are listed).
* Eth0 interface up.* Eth1 interface up.* uSD.* DSI-HDMI converter and HDMI display up.
===== Quiet =====
On quiet the core not nt have any additional process/task.
===== Stressed =====
To simulate high consumption, the following energy-intensive operations were performed:
* configured the both eth interface interfaces are configured and execute an endless iperf3 - with an external server support- is executed* use the camera and stream it streaming a video to the HDMI display* execute the <code>sat</code>, is a specialized executable to stress for stressing the SOC and the RAM memory
Then there are four energy-intensive operations.
!Current
!Power
!DiffNormal!Diff Stress
|-
| '''Quiet-normal (LPM: Over drive)'''
| 0,5 A
| 1.65 W
| Normal reference| -50% (Reference: <code>Stressed-normal (LPM: Over drive)</code>)
|-
| '''Quiet-nominal (LPM: Nominal drive)'''
| 1.55 W
| -6 %
| -32% (Reference: <code>Stressed-nominal (LPM: Nominal drive)</code>)
|-
| '''Stressed-normal (LPM: Over drive)'''
| 2.475 W
| +50%
| Stress reference
|-
| '''Stressed-nominal (LPM: Nominal drive)'''
| 1.55 W
| +24%
| -17 %
|-
| '''Suspend'''
| 0.152 W
| -91 %
| -93 %
|-
|'''Freeze'''
|0.59 W
| -64 %
| -76 %
|}