WIN_A_UPDATE
WR4(sc, DC_CMD_STATE_CONTROL, WIN_A_UPDATE << plane->index);
WR4(sc, DC_CMD_STATE_CONTROL, WIN_A_UPDATE << idx);
WR4(sc, DC_CMD_STATE_CONTROL, GENERAL_UPDATE | WIN_A_UPDATE);
WR4(sc, DC_CMD_STATE_CONTROL, GENERAL_UPDATE | WIN_A_UPDATE);
WR4(sc, DC_CMD_STATE_CONTROL, GENERAL_UPDATE | WIN_A_UPDATE);