SDT
reg_write(vc->dev, SDT[vc->ch], val);
old_std = reg_read(dev, SDT[vc->ch]);
reg_write(dev, SDT[vc->ch], 0x7);
detected_std = reg_read(dev, SDT[vc->ch]);
reg_write(dev, SDT[vc->ch], old_std);