How to Config Multi-Display RK3568

RK3568 has 3 VPorts. 

<img _fck_mw_filename="RK3568 Vport.png" _fck_mw_origimgheight="328" _fck_mw_origimgwidth="307" alt="RTENOTITLE" src="/wiki/images/7/70/RK3568_Vport.png" style="vertical-align:middle;" title="RTENOTITLE" />

RSB-4810\ROM-5880 surport 4 types display : eDP、LVDS、HDMI、MIPI. 

Note：

1. HDMI、eDP、MIPI MUST be set to port 0 and port 1.

2. LVDS MUST be set to port 1 and port 2.

3.  LVDS and MIPI are alternative.

 

 

Enter U-boot interrupt mode

Connect device to debug port, and open debug console. See more : <a alt="http://ess-wiki.advantech.com.tw/view/How_to_debug_RK3568" href="http://ess-wiki.advantech.com.tw/view/How_to_debug_RK3568" title="http://ess-wiki.advantech.com.tw/view/How_to_debug_RK3568">How_to_debug</a>.

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.

<tbody> </tbody>

Module	Sub Module	Step	In Uboot
Single	HDMI	fw_setenv display0 hdmi-default fw_setenv display1 fw_setenv display2	setenv display0 hdmi-default setenv display1 setenv display2
	LVDS	fw_setenv display0 fw_setenv display1 lvds-g070vw01 fw_setenv display2	setenv display0 setenv display1 lvds-g070vw01 setenv display2
	eDP	fw_setenv display0 edp-1366x768 fw_setenv display1 fw_setenv display2	setenv display0 edp-1366x768 setenv display1 setenv display2
	MIPI	fw_setenv display0 mipi-gl0uan fw_setenv display1 fw_setenv display2	setenv display0 mipi-gl0uan setenv display1 setenv display2
Dual	HDMI+LVDS	fw_setenv display0 hdmi-default fw_setenv display1 lvds-g070vw01 fw_setenv display2	setenv display0 hdmi-default setenv display1 lvds-g070vw01 setenv display2
	HDMI+eDP	fw_setenv display0 hdmi-default fw_setenv display1 edp-1366x768 fw_setenv display2	setenv display0 hdmi-default setenv display1 edp-1366x768 setenv display2
	eDP+LVDS	fw_setenv display0 edp-1366x768 fw_setenv display1 lvds-g070vw01 fw_setenv display2	setenv display0 edp-1366x768 setenv display1 lvds-g070vw01 setenv display2
	HDMI+MIPI	fw_setenv display0 hdmi-default fw_setenv display1 mipi-gl0uan fw_setenv display2	setenv display0 hdmi-default setenv display1 mipi-gl0uan setenv display2
	eDP+MIPI	fw_setenv display0 edp-1366x768 fw_setenv display1 mipi-gl0uan fw_setenv display2	setenv display0 edp-1366x768 setenv display1 mipi-gl0uan setenv display2

Note :

LVDS panel support 4 bus format: rgb666_vesa、rgb888_vesa、rgb666_jeida、rgb888_jeida.

If lvds panel is not the default format of rgb888_vesa, Must set lvds format :

fw_setenv lvds_format rgb666_vesa
or
fw_setenv lvds_format rgb666_jeida
or
fw_setenv lvds_format rgb888_jeida

Default Support Display

<tbody> </tbody>

Port	RSB4810 ROM5880
edp	edp-1920x1080 edp-1366x768
lvds	lvds-g070vw01 lvds-g150xgel05 lvds-800x480 lvds-1024x768 lvds-1280x720 lvds-1280x768 lvds-1280x800 lvds-1366x768
hdmi	hdmi-default
mipi	mipi-gl0uan

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 edp-1366x768 as default setting.

3. Check your configuration in Terminal or debug console.

fw_printenv | grep display
... 
display0=hdmi-default
display1=edp-1366x768
...

<tbody> </tbody>

LVDS Name	Resolution
lvds-g070vw01	800x480
lvds-g150xgel05	1024x768

Using envtools in Debian/Android

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

Take “eDP+HDMI”for example :

<tbody> </tbody>

In uboot	In Debian/Android
setenv display0 hdmi-default	fw_setenv display0 hdmi-default
setenv display1 edp-1920x1080	fw_setenv display0 edp-1920x1080
saveenv
reset	reboot

Note :

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