tdm_tx_desc_head_ptr_get
uint32_t tdm_tx_desc_head_ptr_get(struct aq_hw *aq_hw, uint32_t descriptor);
val = tdm_tx_desc_head_ptr_get(&ring->dev->hw, ring->index);
head = tdm_tx_desc_head_ptr_get(&aq_dev->hw, ring->index);