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net: stmmac: reset Tx desc base address before restarting Tx

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Refer to the databook of DesignWare Cores Ethernet MAC Universal:

6.2.1.5 Register 4 (Transmit Descriptor List Address Register

If this register is not changed when the ST bit is set to 0, then
the DMA takes the descriptor address where it was stopped earlier.

The stmmac_tx_err() does zero indices to Tx descriptors, but does
not reset HW current Tx descriptor address. To fix inconsistency,
the base address of the Tx descriptors should be rewritten before
restarting Tx.

Signed-off-by: Jongsung Kim <neidhard.kim@lge.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jongsung Kim 2019-12-06 20:40:00 +09:00 committed by David S. Miller
parent a6a10d45d1
commit f421031e3f
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -2009,6 +2009,8 @@ static void stmmac_tx_err(struct stmmac_priv *priv, u32 chan)
tx_q->cur_tx = 0;
tx_q->mss = 0;
netdev_tx_reset_queue(netdev_get_tx_queue(priv->dev, chan));
stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
tx_q->dma_tx_phy, chan);
stmmac_start_tx_dma(priv, chan);
priv->dev->stats.tx_errors++;