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

Question asked by 其东 刘 on Oct 10, 2018
Latest reply on Oct 10, 2018 by igorpadykov

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.

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