How does the IMX7D reverse the polarity of HSYNC and VSYNC?

[864535720]

Hello, my development board is IMX7Dsabresd. When I drive my screen through the RGB signal on the development board, I found that the polarity of HSYNC and VSYNC output from the development board is opposite to the polarity required by my screen. How can I change it? The polarity of HSYNC and VSYNC.

This is the waveform of the vsync measured by my IMX7D development board.

This is the waveform I need for my screen：

My LCD driver file is using...\git\drivers\video\fbdev\mxsfb.c

What should I modify so that the waveforms of HSYNC and VSYNC match the requirements of my screen.

[igorpadykov]

Hi

HSYNC,VSYNC polarity can be changed using VDCTRL0 register, please check

sect.13.2.4.8 eLCDIF VSYNC Mode and Dotclk Mode Control Register0 (LCDIFx_VDCTRL0n)
i.MX7D Reference Manual

Best regards
igor
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