[PATCH net v2 2/3] net: txgbe: keep MAC enabled for SP devices that support NCSI

The .mac_link_down() in phylink callback disable MAC TX unconditionally.
This is not suitable for devices using NCSI, where the MAC needs to
remain enabled after the link goes down to support the corresponding
functionality.

Skip disabling MAC TX when the subsystem device ID indicates an NCSI.
Keep the existing link-down handling for other devices.

Fixes: 08f08f9390e4 ("net: txgbe: Support phylink MAC layer")
Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
index dc9f243146580..d11f26dc13e92 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c

@@ -182,7 +182,8 @@ static void txgbe_mac_link_down(struct phylink_config *config,
 {
 	struct wx *wx = phylink_to_wx(config);
 
-	wr32m(wx, WX_MAC_TX_CFG, WX_MAC_TX_CFG_TE, 0);
+	if (!((wx->subsystem_device_id & WX_NCSI_MASK) == WX_NCSI_SUP))
+		wr32m(wx, WX_MAC_TX_CFG, WX_MAC_TX_CFG_TE, 0);
 
 	wx->speed = SPEED_UNKNOWN;
 	if (test_bit(WX_STATE_PTP_RUNNING, wx->state))

-- 
2.51.0