From c2e6acb44c6a85de10544a6d6be3237bb3e87c98 Mon Sep 17 00:00:00 2001
From: Denis Kirjanov <denis.kirjanov@suse.com>
Date: Fri, 1 Jul 2022 17:28:33 +0300
Subject: [PATCH] net: stmmac: update rx tail pointer register to fix rx dma
 hang issue.
Git-commit: 4523a5611526709ec9b4e2574f1bb7818212651e
References: git-fixes
Patch-mainline: v5.2-rc3

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

Fixes: 54139cf3bb33 ("net: stmmac: adding multiple buffers for rx")
Signed-off-by: Biao Huang <biao.huang@mediatek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 23fd6c22778c..b2a313ef33ec 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3334,6 +3334,7 @@ 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;
+	priv->hw->dma->set_rx_tail_ptr(priv->ioaddr, rx_q->rx_tail_addr, queue);
 }
 
 /**
-- 
2.16.4