Deep sleep to wake time in Jetson TX2 NX

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi Everyone,

I have a query regarding sleep to wake up latency of Jetson TX2 NX.
I am working on a custom carrier board with Jetson TX2 NX SOM .In the setup Jetson is taking around 2 seconds to wake from deep sleep mode(sudo systemctl suspend). Can we reduce this latency?

2

Hi Everyone ,

In dmesg logs(During wake up of Jetson TX2 NX from deep sleep) I noticed that ,NVIDIA is handling interrupts associated with the wake events.Can we disable those wake sources except sleep/wake pin of nvidia (gpio tegra-gpio-aon wake29)?Is it a good approach to reduce the sleep-wake up latency?

If so, could someone please tell me file path in NVIDIA sdk where the wake sources are listed?

Kindly support me .

Thanks in advance!

4

hello user54608,

can’t you accept 2-sec? may I know what’s the expectation.

please refer to Chipset Power States session for common wake sources available on Jetson platforms.
it’s device tree to define the pin as power-key, and waking up from deep sleep.
for example,
$public_sources/kernel_src/hardware/nvidia/platform/t18x/lanai/kernel-dts/common/tegra186-p3509-0000-cvb.dtsi

        gpio-keys {
                power_key {
                        label = "power-key";
                        gpios = <&tegra_aon_gpio TEGRA_AON_GPIO(FF, 0) GPIO_ACTIVE_LOW>;
                        linux,code = <KEY_POWER>;
                        gpio-key,wakeup;
                };
5

Thank you for the response. Is it possible to reduce the latency from 2 sec to 500ms?

8

hello user54608,

it also takes 2-sec on developer kit to wake from deep sleep.
may I know what’s your actual use-case, you may avoid putting into SC7 if you really care about instant response.

9

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