The EDP panel' backlight control on android 11

[i_MX51]

Dear 

EDP panel needs to send the AUX command to control the backlight +/-. When i implement the android 11.0.0_1.0.0 (imx8qm) on the VAR-SOM-mx8 module, i think the HDMI_AUX_N/P  send the command to the panel to control, but i don't know how to do and where can i check the source code, anybody can help me?  

[Zhiming_Liu]

You can see  this linux patch commit message:

https://lore.kernel.org/dri-devel/1618418390-15055-2-git-send-email-rajeevny@codeaurora.org/