[Linux-stm32] [PATCH 1/6] net: stmmac: update rx tail pointer register to fix rx dma hang issue.

[Biao Huang]

Currently we will not update the receive descriptor tail pointer in
stmmac_rx_refill. Rx dma will think no available descriptors and stop
once received packets exceed DMA_RX_SIZE, so that the rx only test will fail.

Update the receive tail pointer in stmmac_rx_refill to add more descriptors
to the rx channel, so packets can be received continually

Signed-off-by: Biao Huang <biao.huang at mediatek.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 97c5e1a..818ad88 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3336,6 +3336,9 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
 		entry = STMMAC_GET_ENTRY(entry, DMA_RX_SIZE);
 	}
 	rx_q->dirty_rx = entry;
+	stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
+			       rx_q->dma_rx_phy + (entry * sizeof(struct dma_desc)),
+			       queue);
 }
 
 /**
-- 
1.7.9.5