[PATCH 4.19 22/32] net: stmmac: dma channel control register need to be init first

Greg Kroah-Hartman
2019-06-03T09:18:10Z

From: Weifeng Voon <weifeng.voon@intel.com>

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>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- 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
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
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;
}