AnsweredAssumed Answered

LVDS display problem with kernel 3.14.28

Question asked by Ivan Drobyshevskyi on Jul 18, 2018
Latest reply on Jul 26, 2018 by Ivan Drobyshevskyi

I'm trying to add support for LVDS display to i.MX6DL board running 3.14.28 kernel, but the picture is distorted. See attached photos for details (in boot screen photo dark areas are supposed to be solid black).

 

The same display works fine with kernel imx_4.1.15_2.0.0_ga, but unfortunately there's a requirement to make it work with 3.14.28 kernel.

 

I've used exactly the same relevant DT nodes from 4.1.15 kernel (attached in a fido_display.dts file).

 

What is strange: setting resolution to 1920x1080 (proper/desired resolution is 800x480) and enabling split mode fixes the picture (see fbtest_ok.JPG), but it doesn't fit the display.

 

Any suggestions as to where to look: missing commit(s) to one of IPU drivers, DT properties, etc?

Also what kind of setting mismatch could produce picture distortion we are observing?

 

Thanks!

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