How to config Multi-Display for rk3288 series Debian9

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RSB-4680 surport 3 display ports : eDP、LVDS、HDMI . Only two ports work at the same time .

You can config Multi-Display to eDP + HDMI 、eDP + LVDS、LVDS + HDMI .

Enter U-boot interrupt mode

Connect device to debug port, and open debug console. See more : How_to_debug.

Press "ctrl + c" key before power up the device, until get the following information on debug console : 

Hit any key to stop autoboot: 0
=> <INTERRUPT>
=>

Then you can input the following cammand to config Multi-Display.


eDP + HDMI

setenv prmry_screen edp-1920x1080
setenv extend_screen hdmi-default
saveenv
reset


eDP + LVDS

setenv prmry_screen edp-1920x1080
setenv extend_screen lvds-g070vw01
saveenv
reset

LVDS + HDMI

setenv prmry_screen hdmi-default
setenv extend_screen lvds-g070vw01
saveenv
reset

Default Support Display

Port RSB4680 USM110
edp edp-1920x1200
edp-1920x1080
edp-1024x768
edp-1920x1080
edp-1280x720
edp-1024x768
edp-720x480
edp-640x480
lvds lvds-g070vw01
lvds-idk1110wp
lvds-g150xgel05
lvds-g215hvn01
lvds-p460hvn02
NA
hdmi hdmi-default
hdmi-default


NOTE : 

1. The name of the panel must begin with "edp-"、"lvds-" or "hdmi-" .

And it can be found in "kernel/include/dt-bindings/display/screen-timing/{LCDNAME}.dtsi" like :

lvds_g070vw01: lvds-g070vw01

2. If there is no configuration, you will get default setting :

edp-default (edp-1920x1080) and hdmi-default as default setting.

3. Check your configuration in Terminal or debug console.

cat /proc/cmdline
... prmry_screen=edp-1920x1080 extend_screen=hdmi-default