net: stmmac: dma channel control register need to be init first

stmmac_init_chan() needs to be called before stmmac_init_rx_chan() and
stmmac_init_tx_chan(). This is because if PBLx8 is to be used,
"DMA_CH(#i)_Control.PBLx8" needs to be set before programming
"DMA_CH(#i)_TX_Control.TxPBL" and "DMA_CH(#i)_RX_Control.RxPBL".

Fixes: 47f2a9ce527a ("net: stmmac: dma channel init prepared for multiple queues")
Reviewed-by: Zhang, Baoli <baoli.zhang@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Weifeng Voon <weifeng.voon@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 5debe93..50c0082 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2195,6 +2195,10 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
        if (priv->plat->axi)
                stmmac_axi(priv, priv->ioaddr, priv->plat->axi);
 
+       /* DMA CSR Channel configuration */
+       for (chan = 0; chan < dma_csr_ch; chan++)
+               stmmac_init_chan(priv, priv->ioaddr, priv->plat->dma_cfg, chan);
+
        /* DMA RX Channel Configuration */
        for (chan = 0; chan < rx_channels_count; chan++) {
                rx_q = &priv->rx_queue[chan];
@@ -2220,10 +2224,6 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
                                       tx_q->tx_tail_addr, chan);
        }
 
-       /* DMA CSR Channel configuration */
-       for (chan = 0; chan < dma_csr_ch; chan++)
-               stmmac_init_chan(priv, priv->ioaddr, priv->plat->dma_cfg, chan);
-
        return ret;
 }