linux-kernel - [PATCH v3] net: phy: meson-gxl: implement meson_gxl_phy

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Date:   Tue,  8 Aug 2023 01:00:15 -0400
From:   Da Xue <da@...re.computer>
To:     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>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Da Xue <da@...re.computer>, Luke Lu <luke.lu@...re.computer>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] net: phy: meson-gxl: implement meson_gxl_phy_resume()

After suspend and resume, the meson GXL internal PHY config needs to
be initialized again, otherwise the carrier cannot be found:

	eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state
		DOWN group default qlen 1000

After the patch, resume:

	eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
		group default qlen 1000

Signed-off-by: Luke Lu <luke.lu@...re.computer>
Signed-off-by: Da Xue <da@...re.computer>
---
Changes since v2:
 - fix missing parameter of genphy_resume()

Changes since v1:
 - call generic genphy_resume()
---
 drivers/net/phy/meson-gxl.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index bb9b33b6bce2..bbad26b7c5a1 100644
--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -132,6 +132,18 @@ static int meson_gxl_config_init(struct phy_device *phydev)
 	return 0;
 }
 
+static int meson_gxl_phy_resume(struct phy_device *phydev)
+{
+	int ret;
+
+	genphy_resume(phydev);
+	ret = meson_gxl_config_init(phydev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 /* This function is provided to cope with the possible failures of this phy
  * during aneg process. When aneg fails, the PHY reports that aneg is done
  * but the value found in MII_LPA is wrong:
@@ -196,7 +208,7 @@ static struct phy_driver meson_gxl_phy[] = {
 		.config_intr	= smsc_phy_config_intr,
 		.handle_interrupt = smsc_phy_handle_interrupt,
 		.suspend        = genphy_suspend,
-		.resume         = genphy_resume,
+		.resume         = meson_gxl_phy_resume,
 		.read_mmd	= genphy_read_mmd_unsupported,
 		.write_mmd	= genphy_write_mmd_unsupported,
 	}, {
-- 
2.40.1