linux-kernel - [PATCH net-next v3 3/5] net: phy: update in-band AN mode when changing interface by PHY driver

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Message-Id: <20230921121946.3025771-4-yong.liang.choong@linux.intel.com>
Date:   Thu, 21 Sep 2023 20:19:44 +0800
From:   Choong Yong Liang <yong.liang.choong@...ux.intel.com>
To:     Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        David E Box <david.e.box@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Marek Behún <kabel@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Wong Vee Khee <veekhee@...le.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Revanth Kumar Uppala <ruppala@...dia.com>,
        Shenwei Wang <shenwei.wang@....com>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Jochen Henneberg <jh@...neberg-systemdesign.com>
Cc:     David E Box <david.e.box@...el.com>,
        Andrew Halaney <ahalaney@...hat.com>,
        Simon Horman <simon.horman@...igine.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        platform-driver-x86@...r.kernel.org, linux-hwmon@...r.kernel.org,
        bpf@...r.kernel.org, Voon Wei Feng <weifeng.voon@...el.com>,
        Tan Tee Min <tee.min.tan@...ux.intel.com>,
        Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Lai Peter Jun Ann <jun.ann.lai@...el.com>
Subject: [PATCH net-next v3 3/5] net: phy: update in-band AN mode when changing interface by PHY driver

As there is a mechanism in PHY drivers to switch the PHY interface
between SGMII and 2500BaseX according to link speed. In this case,
the in-band AN mode should be switching based on the PHY interface
as well, if the PHY interface has been changed/updated by PHY driver.

For e.g., disable in-band AN in 2500BaseX mode, or enable in-band AN
back for SGMII mode (10/100/1000Mbps).

Signed-off-by: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
---
 drivers/net/phy/phylink.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 0d7354955d62..5811c8086149 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1723,6 +1723,34 @@ bool phylink_expects_phy(struct phylink *pl)
 }
 EXPORT_SYMBOL_GPL(phylink_expects_phy);
 
+/**
+ * phylink_interface_change() - update both cfg_link_an_mode and
+ * cur_link_an_mode when there is a change in the interface.
+ * @phydev: pointer to &struct phy_device
+ *
+ * When the PHY interface switches between SGMII and 2500BaseX in
+ * accordance with the link speed, the in-band AN mode should also switch
+ * based on the PHY interface
+ */
+static void phylink_interface_change(struct phy_device *phydev)
+{
+	struct phylink *pl = phydev->phylink;
+
+	if (pl->phy_state.interface != phydev->interface) {
+		/* Fallback to the correct AN mode. */
+		if (phy_interface_mode_is_8023z(phydev->interface) &&
+		    pl->cfg_link_an_mode == MLO_AN_INBAND) {
+			pl->cfg_link_an_mode = MLO_AN_PHY;
+			pl->cur_link_an_mode = MLO_AN_PHY;
+		} else if (pl->config->ovr_an_inband) {
+			pl->cfg_link_an_mode = MLO_AN_INBAND;
+			pl->cur_link_an_mode = MLO_AN_INBAND;
+		}
+
+		pl->phy_state.interface = phydev->interface;
+	}
+}
+
 static void phylink_phy_change(struct phy_device *phydev, bool up)
 {
 	struct phylink *pl = phydev->phylink;
@@ -1739,7 +1767,7 @@ static void phylink_phy_change(struct phy_device *phydev, bool up)
 		pl->phy_state.pause |= MLO_PAUSE_TX;
 	if (rx_pause)
 		pl->phy_state.pause |= MLO_PAUSE_RX;
-	pl->phy_state.interface = phydev->interface;
+	phylink_interface_change(phydev);
 	pl->phy_state.link = up;
 	mutex_unlock(&pl->state_mutex);
 
-- 
2.25.1