Questions about IMX8 two LVDS displays

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Questions about IMX8 two LVDS displays

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RobbieJiang
Contributor IV

We have a IMX8QM board with Linux 4.19.35.

And the system have two LVDS interface (LVDS-1, LVDS-2) connected to two 800x400 LCD panel separately.

Each LVDS display works well with 'modetest' cmd.

E.g, 

modetest -M imx-drm -s 149@65:1280x768-60 //LVDS1

OR 

modetest -M imx-drm -s 151@123:800x480-60 //LVDS2

However, it is impossible to show the test pattern image on two LVDS panels SIMULTANEOUSLY.

My questions are:

1. How to make two LVDS interfaces work at the same time?

2. No frame buffer device (/dev/fb*) for my display devices.

The rootfs is built from yocto (bitbake imx-image-multimedia),

and only one frame buffer device (/dev/fb0) appears. 

How to enable frame buffer devices for two LVDS interfaces?

 

Regards,

Robbie

 

 

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