[Linux-stm32] [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is up without PHY

[Jose Abreu]

When we don't have any real PHY driver connected and we get link up from
PCS we shall configure MAC and PCS for the desired speed and also
resolve the flow control settings from MAC side.

Signed-off-by: Jose Abreu <Jose.Abreu at synopsys.com>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro at st.com>
Cc: Alexandre Torgue <alexandre.torgue at st.com>
Cc: Jose Abreu <joabreu at synopsys.com>
Cc: "David S. Miller" <davem at davemloft.net>
Cc: Jakub Kicinski <kuba at kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
Cc: Russell King <linux at armlinux.org.uk>
Cc: Andrew Lunn <andrew at lunn.ch>
Cc: Florian Fainelli <f.fainelli at gmail.com>
Cc: Heiner Kallweit <hkallweit1 at gmail.com>
Cc: netdev at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
---
 drivers/net/phy/phylink.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 4174d874b1f7..75dbaf80d7a5 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -533,10 +533,20 @@ static void phylink_resolve(struct work_struct *w)
 
 	if (link_changed) {
 		pl->old_link_state = link_state.link;
-		if (!link_state.link)
+		if (!link_state.link) {
 			phylink_mac_link_down(pl);
-		else
+		} else {
+			/* If no PHY is connected, we still need to configure
+			 * MAC/PCS for flow control and speed.
+			 */
+			if (!pl->phydev) {
+				phylink_resolve_flow(pl, &link_state);
+				phylink_mac_config(pl, &link_state);
+			}
+
 			phylink_mac_link_up(pl, link_state);
+		}
+
 	}
 	if (!link_state.link && pl->mac_link_dropped) {
 		pl->mac_link_dropped = false;
-- 
2.7.4