View source for How to Config Multi-Display for RK3399 RSB4710

==  ==

RSB-4710&nbsp;surport 4&nbsp;display ports&nbsp;: eDP、LVDS（mipi to LVDS）、HDMI、DP&nbsp;（DP to HDMI）.&nbsp;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：'''

&nbsp; &nbsp; &nbsp; &nbsp; Android&nbsp;distinguish the primary and the extend screen.&nbsp;

== Contents ==

&nbsp;[[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710# hide]]&nbsp;

*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#Enter_U-boot_interrupt_mode 1&nbsp;Enter U-boot interrupt mode]
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#eDP_.2B_HDMI 2&nbsp;eDP + HDMI]
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#eDP_.2B_LVDS 3&nbsp;eDP + LVDS]
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#LVDS_.2B_HDMI 4&nbsp;LVDS + HDMI]
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#eDP_.2B_DP 5&nbsp;eDP + DP]
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#LVDS_.2B_DP 6&nbsp;LVDS + DP]
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#HDMI_.2B_DP 7&nbsp;HDMI + DP]
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#Default_Support_Display 8&nbsp;Default Support Display]

== Enter U-boot interrupt mode ==

Connect device to debug port, and open debug console. See more&nbsp;: [[How_to_debug_for_RK3399_RSB4710|How_to_debug]].

Press&nbsp;"ctrl + c" key before power up the device, until get the following information on debug console&nbsp;:&nbsp;
<pre>Hit any key to stop autoboot: 0
=> <INTERRUPT>
=></pre>

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

== eDP + HDMI ==
<pre>setenv prmry_screen edp-1920x1080
setenv extend_screen hdmi-default
saveenv
reset
</pre>



or
<pre>setenv prmry_screen hdmi-default
setenv extend_screen edp-1920x1080
saveenv
reset
</pre>

== eDP + LVDS ==
<pre>setenv prmry_screen edp-1920x1080
setenv extend_screen lvds-g070vw01
saveenv
reset
</pre>

or
<pre>setenv prmry_screen lvds-g070vw01
setenv extend_screen edp-1920x1080 
saveenv
reset
</pre>



== LVDS + HDMI ==
<pre>setenv prmry_screen hdmi-default
setenv extend_screen lvds-g070vw01
saveenv
reset
</pre>

or
<pre>setenv prmry_screen lvds-g070vw01
setenv extend_screen hdmi-default
saveenv
reset
</pre>

== eDP + DP ==
<pre>setenv prmry_screen edp-1920x1080
setenv extend_screen dp-default
saveenv
reset
</pre>



or
<pre>setenv prmry_screen dp-default
setenv extend_screen edp-1920x1080
saveenv
reset
</pre>



== LVDS + DP ==
<pre>setenv prmry_screen dp-default
setenv extend_screen lvds-g070vw01
saveenv
reset
</pre>

or
<pre>setenv prmry_screen lvds-g070vw01
setenv extend_screen dp-default 
saveenv
reset
</pre>



== HDMI + DP ==
<pre>setenv prmry_screen hdmi-default
setenv extend_screen dp-default
saveenv
reset
</pre>

or
<pre>setenv prmry_screen dp-fefault
setenv extend_screen hdmi-default
saveenv
reset
</pre>

== Default Support Display ==

{| border="1" cellspacing="1" cellpadding="1"
|-
| '''Port'''
| '''RSB4710'''
|-
| edp
| edp-1920x1080<br/>edp-1366x768<br/>
|-
| lvds
| lvds-g070vw01<br/>lvds-g150xgel05<br/>lvds-g215hvn01<br/>
|-
| hdmi
| hdmi-default<br/>
|-
| dp
| dp-default
|}

<br/>'''NOTE&nbsp;:&nbsp;'''

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

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

lvds_g070vw01:&nbsp;'''lvds-g070vw01'''

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

hdmi-default&nbsp; and&nbsp;dp-default as default setting.

3. Check your configuration in Terminal or debug console.
<pre>cat /proc/cmdline
... prmry_screen=hdmi-default extend_screen=dp-default</pre>

{| border="1" cellspacing="1" cellpadding="1"
|-
| LVDS Name
| Resolution
|-
| lvds-g070vw01<br/>
| 800x480
|-
| lvds-g150xgel05<br/>
| 1024x768
|-
| lvds-g215hvn01<br/>
| 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 :

{| border="1" cellspacing="1" cellpadding="1"
|-
| '''In uboot'''
| '''In Debian/Android'''
|-
| <span style="color:#FF0000;">setenv</span> prmry_screen hdmi-default<br/>
| <span style="color:#FF0000;">fw_setenv</span> prmry_screen hdmi-default<br/>
|-
| <span style="color:#FF0000;">setenv</span> extend_screen edp-1920x1080
| <span style="color:#FF0000;">fw_setenv</span> extend_screen edp-1920x1080<br/>
|-
| saveenv
| <br/>
|-
| reset
| reboot
|}

'''Note :'''

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