vc2_read_ireg
vep = vc2_read_ireg(dc, VC2_IREG_VIDEO_ENTRY);
scratch = vc2_read_ireg(dc, VC2_IREG_CONFIG);
curp = vc2_read_ireg(dc, VC2_IREG_CURSOR_ENTRY);
tmp = vc2_read_ireg(dc, VC2_IREG_CONTROL) & VC2_CONTROL_INTERLACE;