CRMFB_VT_XY
crmfb_write_reg(sc, CRMFB_VT_XY, 0);
crmfb_write_reg(sc, CRMFB_VT_XY, 1 << CRMFB_VT_XY_FREEZE_SHIFT);
crmfb_write_reg(sc, CRMFB_VT_XY, d);