A_SG_CONTROL
t1_write_reg_4(chp->sge->obj, A_SG_CONTROL, 0x0);
t1_write_reg_4(ap, A_SG_CONTROL, 0);
t1_write_reg_4(sge->obj, A_SG_CONTROL, sge->sge_control);
t1_write_reg_4(sge->obj, A_SG_CONTROL, 0x0);