[WIP] Possible ESD Enhancement for NRU-170-PPC to reset eDP

Memo

• We added additional eDP HDP to Jetson GPI since ES2 (PZ.03)

• We try to leverage two existing mechanism to reset the eDP display

  • gpio-keys

  • acpid

gpio-keys

A customized device tree to treat PZ.03 as SW_LID

sources/hardware/nvidia/platform/t23x/p3768/kernel-dts/cvb/nru160-a0.dtsi

 gpio-keys {
               ...
                // Fake eDP HDP as KEY_VOLUMEUP for acpid process to re-enable eDP for ESD
                // PY.04 to leverage PPS input for testing. PZ.03 the eDP HDP detectioneDP for ESD
                eDP_detection {
                        label = "eDP_detection";
                        // eDP HDP from ES2
                        gpios = <&tegra_main_gpio TEGRA234_MAIN_GPIO(Z, 3) GPIO_ACTIVE_LOW>;

                        // Faking with GPS PPS for testing
                        // gpios = <&tegra_main_gpio TEGRA234_MAIN_GPIO(Y, 4) GPIO_ACTIVE_LOW>;

                        linux,input-type = <EV_SW>;
                        linux,code = <SW_LID>;
                        // gpio-key,wakeup;
                };
                ...
        };

acpid

Installation

sudo apt-get install acpid
sudo reboot

## Check the PZ.03 GPI event by 
## sudo acpi_listen

Scripts to Add

/etc/acpi/events/lid

event=button/lid.*
action=/etc/acpi/lid.sh %e

/etc/acpi/lid.sh

#!/bin/bash

# Log the lid state
echo "Lid state changed" >> /var/log/lid_state.log

# Handle lid open/close events
case "$3" in
    open)
        echo "Lid opened" >> /var/log/lid_state.log
	sudo -u nvidia /usr/src/eDP_reset.sh        
        ;;
    close)
        echo "Lid closed" >> /var/log/lid_state.log        
        ;;
esac

/usr/src/eDP_reset.sh

#!/bin/bash

export DISPLAY=:0
xrandr

xrandr --output DP-0 --off;
sleep 0.2;
xrandr --output DP-0 --mode 1920x1200
#sleep 3
#xrandr --output DP-0 --off;
#sleep 0.2;
#xrandr --output DP-0 --mode 1920x1200

# 

Back to Terminal

sudo chmod +x /usr/src/eDP_reset.sh
sudo chown nvidia /usr/src/eDP_reset.sh
sudo chmod +x /etc/acpi/lid.sh
sudo systemctl restart acpid