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OMAP4 LCD signals polarity change

Hi,
I am facing with problem of revert polarity. Now I have Hsync and Vsync polarity HIGH (active LOW), but my display need it reverted. Where I can change it? I'm working with Linux on board. I tried with Xrandr, but it's not changing polarity as I need. With 'fbset' I see polarity is "changed" but with oscilloscope I see nothing have changed.
From what I read it looks I should search answer with OMAPDSS, I found this site: 

http://processors.wiki.ti.com/index.php/Display_Subsystem

And later I find that if I change timings in /sys/devices/platform/omapdss/display0  I see changes with Oscilloscope, but there is no possibility to revert polarity (only period, back porch and width I can change).

Can sb help me with it or show where to look for answers?