Enable ROCK 5A HDMI_8K Port HDMI CEC

The following content will introduce how to add the hdmi cec support by installing the kernel deb package.

Download kernel packages

wget https://github.com/radxa-pkg/linux-rockchip/releases/download/5.10.110-23/linux-headers-5.10.110-23-rockchip_5.10.110-23-fbfc4e20e_arm64.deb

wget https://github.com/radxa-pkg/linux-rockchip/releases/download/5.10.110-23/linux-image-5.10.110-23-rockchip_5.10.110-23-fbfc4e20e_arm64.deb

Install kernel packages

sudo dpkg -i linux-headers-5.10.110-23-rockchip_5.10.110-23-fbfc4e20e_arm64.deb

sudo dpkg -i linux-image-5.10.110-23-rockchip_5.10.110-23-fbfc4e20e_arm64.deb

Then reboot the board.

sudo reboot

Check current kernel

Kernel version:

uname -r

Confirm /proc/device-tree/hdmi@fde80000/cec-enable exist

ls /proc/device-tree/hdmi@fde80000/cec-enable

Connection

Connect ROCK 5A HDMI_8K port to TV.

Test cec function

HDMI-CEC standby

This step need root user for ROCK 5A.

sudo su

Check HDMI CEC status on ROCK 5A.

cec-ctl --playback -o Rockchip -V 0xaabbcc -M -T      

Press the power button on the TV remote control, and then ROCK 5A terminal should appear Received from TV to all (0 to 15): STANDBY (0x36)

HDMI-CEC wake up

This step need root user for ROCK 5A.

Turn off the TV. Run the following command to wake up TV.

cec-ctl --image-view-on --to 0

TV will wake up.

HDMI-CEC DPAD direction and other function keys

This step need root user for ROCK 5A.

Check HDMI CEC status on ROCK 5A.

cec-ctl --playback -o Rockchip -V 0xaabbcc -M -T

Press the TV remote control keys, like up, down, left, right, return, ENTER, etc. ROCK 5A should get corresponding printing.