VBP
chipone_writeb(icn, VBP, mode->vtotal - mode->vsync_end);
pTiming->VST + (pTiming->VBP - margins) + VTopBorder;
pTiming->VST + (pTiming->VBP - margins) + VTopBorder +
var->upper_margin = par->VBP;
par->VBP = info->var.upper_margin;
par->VTot = par->YRES + par->VBP + par->VST + par->VFP;
u32 VBP; /* Ver Back Porch */