The ring element data, though being part of coherent memory, still need
to be performed before updating the ring context to point to this new
element. That can be guaranteed with a memory barrier (dma_wmb).
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
dma_addr_t db;
db = ring->iommu_base + (ring->wp - ring->base);
+
+ /*
+ * Writes to the new ring element must be visible to the hardware
+ * before letting h/w know there is new element to fetch.
+ */
+ dma_wmb();
*ring->ctxt_wp = db;
+
mhi_chan->db_cfg.process_db(mhi_cntrl, &mhi_chan->db_cfg,
ring->db_addr, db);
}