How to Config Multi-Display for RK3399 RSB4710

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Introductory

ROM-5780 surport 4 display ports : eDP、LVDS（mipi to LVDS）、HDMI、DP （DP to HDMI）. Only two ports work at the same time .
You can config Multi-Display to eDP + HDMI 、eDP + LVDS、LVDS + HDMI 、eDP + DP、LVDS + DP、HDMI + DP.

NOTE：

Android distinguish the primary and the extend screen. 

Contents

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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

 

or 

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

eDP + LVDS

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

or 

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

 

LVDS + HDMI

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

or 

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

eDP + DP

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

 

or 

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

 

LVDS + DP

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

or 

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

 

HDMI + DP

setenv prmry_screen hdmi-default
setenv extend_screen dp-default
saveenv
reset

or 

setenv prmry_screen dp-fefault
​setenv extend_screen hdmi-default
saveenv
reset

Default Support Display

Port RSB4710
edp edp-1920x1080
edp-1366x768
lvds lvds-g070vw01
lvds-g150xgel05
lvds-g215hvn01
hdmi hdmi-default
dp dp-default


NOTE : 

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

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 :

hdmi-default  and dp-default as default setting.

3. Check your configuration in Terminal or debug console. 

cat /proc/cmdline
... prmry_screen=hdmi-default extend_screen=dp-default
LVDS Name Resolution
lvds-g070vw01 800x480
lvds-g150xgel05 1024x768
lvds-g215hvn01 1920x1080

Using envtools in Debian/Android

Using envtools to setup envs in Debian/Android OS is very similar in uboot.

Take “eDP+HDMI”for example :

In uboot In Debian/Android
setenv prmry_screen hdmi-default fw_setenv prmry_screen hdmi-default
setenv extend_screen edp-1920x1080 fw_setenv extend_screen edp-1920x1080
saveenv  
reset reboot

Note :

The tool "fw_setenv" will save envs automatically in Debian/Android OS, so it isn't necessary to saveen manually.

查看设备当前配置：

root@linaro-alip:~# cat /proc/cmdline
storagemedia=emmc androidboot.storagemedia=emmc androidboot.mode=normal  androidboot.verifiedbootstate=orange androidboot.slot_suffix= androidboot.serialno=a2fc4116ad6b2c4f  rw rootwait earlycon=uart8250,mmio32,0xff180000 swiotlb=1 console=ttyS0,115200 root=PARTUUID=614e0000-0000 rootfstype=ext4 coherent_pool=1m quiet board_info=9 prmry_screen=hdmi-default extend_screen=lvds-g070vw01
root@linaro-alip:~#

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