hbg_hw_get_fifo_used_num
hbg_hw_get_fifo_used_num(priv, ring->dir));
u32 hbg_hw_get_fifo_used_num(struct hbg_priv *priv, enum hbg_dir dir);
hbg_hw_get_fifo_used_num(priv, HBG_DIR_TX));
u32 remained = hbg_hw_get_fifo_used_num(priv, HBG_DIR_RX);
return hbg_hw_get_fifo_used_num(priv, dir) >=