MT_PDMA_SLP_PROT
mt76_set(dev, MT_PDMA_SLP_PROT, MT_PDMA_AXI_SLPPROT_ENABLE);
if (!mt76_poll_msec(dev, MT_PDMA_SLP_PROT,
mt76_clear(dev, MT_PDMA_SLP_PROT, MT_PDMA_AXI_SLPPROT_ENABLE);