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Dual display (LVDS and HDMI)

Question asked by Dominic Amann on Dec 4, 2014
Latest reply on Jul 20, 2017 by victor Wang

I am having issues getting HDMI working with LVDS at the same time.

 

I think I should have /dev/fb2 and /dev/fb3? I do have /dev/fb0 and /dev/fb1 only.

 

Probably device tree related. Here is the related dts part:

 

mxcfb1: fb@0 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "ldb";
interface_pix_fmt = "RGB666";
mode_str = "800x480M@60";
default_bpp = <32>;
int_clk = <0>;
late_init = <0>;
status = "okay";
};

 

 

mxcfb2: fb@1 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "hdmi";
interface_pix_fmt = "RGB24";
mode_str ="1920x1080M@60";
default_bpp = <24>;
int_clk = <0>;
late_init = <0>;
status = "okay";
};

 

Here is the display portion of the kernel cmdline

video=mxcfb0:dev=ldb,LDB-DISPLAY,if=RGB24,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32

 

the LVDS works fine. Can't get a peep out of hdmi.

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