net: stmmac: Setup a default RX Coalesce value instead of the minimum

For performance reasons, sometimes using the minimum RX Coalesce value
is not optimal. Lets setup a default value that is optimal in most of
the use cases.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/common.h

@@ -248,6 +248,7 @@ struct stmmac_safety_stats {
 /* Max/Min RI Watchdog Timer count value */
 #define MAX_DMA_RIWT		0xff
 #define MIN_DMA_RIWT		0x10
+#define DEF_DMA_RIWT		0xa0
 /* Tx coalesce parameters */
 #define STMMAC_COAL_TX_TIMER	1000
 #define STMMAC_MAX_COAL_TX_TICK	100000

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -2605,9 +2605,10 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 	priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
 
 	if (priv->use_riwt) {
-		ret = stmmac_rx_watchdog(priv, priv->ioaddr, MIN_DMA_RIWT, rx_cnt);
-		if (!ret)
-			priv->rx_riwt = MIN_DMA_RIWT;
+		if (!priv->rx_riwt)
+			priv->rx_riwt = DEF_DMA_RIWT;
+
+		ret = stmmac_rx_watchdog(priv, priv->ioaddr, priv->rx_riwt, rx_cnt);
 	}
 
 	if (priv->hw->pcs)