[U-Boot] [PATCHv2 09/10] net: mvpp2x: remove TX drain from transmit routine

[stefanc at marvell.com]

From: Stefan Chulski <stefanc at marvell.com>

TX drain in transmit procedure could cause issues due
to race between drain procedure and transmition of descriptor
between AGGR TXQ and physical TXQ.
TXQ will be cleared before moving to Linux by stop procedure.

Signed-off-by: Stefan Chulski <stefanc at marvell.com>
Tested-by: iSoC Platform CI <ykjenk at marvell.com>
Reviewed-by: Nadav Haklai <nadavh at marvell.com>
Reviewed-by: Igal Liberman <igall at marvell.com>
---
 drivers/net/mvpp2.c | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/drivers/net/mvpp2.c b/drivers/net/mvpp2.c
index 37056c2..a7077c7 100644
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -5254,21 +5254,6 @@ static int mvpp2_recv(struct udevice *dev, int flags, uchar **packetp)
 	return rx_bytes;
 }
 
-/* Drain Txq */
-static void mvpp2_txq_drain(struct mvpp2_port *port, struct mvpp2_tx_queue *txq,
-			    int enable)
-{
-	u32 val;
-
-	mvpp2_write(port->priv, MVPP2_TXQ_NUM_REG, txq->id);
-	val = mvpp2_read(port->priv, MVPP2_TXQ_PREF_BUF_REG);
-	if (enable)
-		val |= MVPP2_TXQ_DRAIN_EN_MASK;
-	else
-		val &= ~MVPP2_TXQ_DRAIN_EN_MASK;
-	mvpp2_write(port->priv, MVPP2_TXQ_PREF_BUF_REG, val);
-}
-
 static int mvpp2_send(struct udevice *dev, void *packet, int length)
 {
 	struct mvpp2_port *port = dev_get_priv(dev);
@@ -5312,9 +5297,6 @@ static int mvpp2_send(struct udevice *dev, void *packet, int length)
 		tx_done = mvpp2_txq_pend_desc_num_get(port, txq);
 	} while (tx_done);
 
-	/* Enable TXQ drain */
-	mvpp2_txq_drain(port, txq, 1);
-
 	timeout = 0;
 	do {
 		if (timeout++ > 10000) {
@@ -5324,9 +5306,6 @@ static int mvpp2_send(struct udevice *dev, void *packet, int length)
 		tx_done = mvpp2_txq_sent_desc_proc(port, txq);
 	} while (!tx_done);
 
-	/* Disable TXQ drain */
-	mvpp2_txq_drain(port, txq, 0);
-
 	return 0;
 }
 
-- 
1.9.1