DM8127 IPNC RDK3.8 : How can I change HDVPSS VP0 HDPOL from positive to negative?

Hi.

I use DM8127 HDVPSS VP0 capture 16bit YUV422 image data.

I found that VP0 capture image data from HDSYNC using positive HDPOL.

But my image data was from HDSYNC negative HDPOL.

Is there any HDVPSS regs or other methods to change the HDSYNC HDPOL.