Sorry for the delay,
Step to move HS and VS
1) Run 5_3a_HDMI_In_CP_ENABLED_YPrPb_Out_Audio_48Khz_PCM_I2S_audio_up_to_225Mhz_only to initialize the 7850. Could be any valid script.
2) set VFE 0x04 = 0x61
3) CP HS__START and HS_END will now move Hsync edges
4) CP VS_START and VS_END will now move Vsync edges