net: sparx5: activate FDMA tx in start()

The function sparx5_fdma_tx_activate() is responsible for configuring
the TX FDMA instance and activating the channel. TX activation has
previously been done in the xmit() function, when the first frame is
transmitted. Now that we have separate functions for starting and
stopping the FDMA, it seems reasonable to move the TX activation to the
start function. This change has no implications on the functionality.

Reviewed-by: Steen Hegelund <[email protected]>
Signed-off-by: Daniel Machon <[email protected]>
Link: https://patch.msgid.link/20250113-sparx5-lan969x-switch-driver-5-v2-3-c468f02fd623@microchip.com
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Danielmachon

drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c

@@ -217,7 +217,6 @@ int sparx5_fdma_xmit(struct sparx5 *sparx5, u32 *ifh, struct sk_buff *skb)
 {
 	struct sparx5_tx *tx = &sparx5->tx;
 	struct fdma *fdma = &tx->fdma;
-	static bool first_time = true;
 	void *virt_addr;
 
 	fdma_dcb_advance(fdma);
@@ -238,12 +237,8 @@ int sparx5_fdma_xmit(struct sparx5 *sparx5, u32 *ifh, struct sk_buff *skb)
 		     FDMA_DCB_STATUS_BLOCKO(0) |
 		     FDMA_DCB_STATUS_BLOCKL(skb->len + IFH_LEN * 4 + 4));
 
-	if (first_time) {
-		sparx5_fdma_tx_activate(sparx5, tx);
-		first_time = false;
-	} else {
-		sparx5_fdma_reload(sparx5, fdma);
-	}
+	sparx5_fdma_reload(sparx5, fdma);
+
 	return NETDEV_TX_OK;
 }
 
@@ -456,6 +451,7 @@ static u32 sparx5_fdma_port_ctrl(struct sparx5 *sparx5)
 int sparx5_fdma_start(struct sparx5 *sparx5)
 {
 	struct sparx5_rx *rx = &sparx5->rx;
+	struct sparx5_tx *tx = &sparx5->tx;
 
 	netif_napi_add_weight(rx->ndev,
 			      &rx->napi,
@@ -465,6 +461,7 @@ int sparx5_fdma_start(struct sparx5 *sparx5)
 	napi_enable(&rx->napi);
 
 	sparx5_fdma_rx_activate(sparx5, rx);
+	sparx5_fdma_tx_activate(sparx5, tx);
 
 	return 0;
 }