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

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Date:   Mon, 27 Jan 2020 12:09:11 +0100
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     netdev@...r.kernel.org
Cc:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is up without PHY

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@...opsys.com>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: Alexandre Torgue <alexandre.torgue@...com>
Cc: Jose Abreu <joabreu@...opsys.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: Russell King <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Florian Fainelli <f.fainelli@...il.com>
Cc: Heiner Kallweit <hkallweit1@...il.com>
Cc: netdev@...r.kernel.org
Cc: linux-stm32@...md-mailman.stormreply.com
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.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