MTK_CDMP_IG_CTRL
u32 val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
mtk_w32(eth, val, MTK_CDMP_IG_CTRL);
val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
mtk_w32(eth, val | MTK_CDMP_STAG_EN, MTK_CDMP_IG_CTRL);