From c36757eb9dee13681227ad3676d37f14b3a2b2af Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Mon, 12 Aug 2019 21:20:02 +0200
Subject: [PATCH] net: phy: consider AN_RESTART status when reading link status
After configuring and restarting aneg we immediately try to read the
link status. On some systems the PHY may not yet have cleared the
"aneg complete" and "link up" bits, resulting in a false link-up
signal. See [0] for a report.
Clause 22 and 45 both require the PHY to keep the AN_RESTART
bit set until the PHY actually starts auto-negotiation.
Let's consider this in the generic functions for reading link status.
The commit marked as fixed is the first one where the patch applies
cleanly.
[0] https://marc.info/?t=156518400300003&r=1&w=2
Fixes: c1164bb1a631 ("net: phy: check PMAPMD link status only in genphy_c45_read_link")
Tested-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
drivers/net/phy/phy-c45.c | 14 ++++++++++++++
drivers/net/phy/phy_device.c | 12 +++++++++++-
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index b9d4145781caa0..58bb25e4af1066 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -219,6 +219,20 @@ int genphy_c45_read_link(struct phy_device *phydev)
int val, devad;
bool link = true;
+ if (phydev->c45_ids.devices_in_package & MDIO_DEVS_AN) {
+ val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
+ if (val < 0)
+ return val;
+
+ /* Autoneg is being started, therefore disregard current
+ * link status and report link as down.
+ */
+ if (val & MDIO_AN_CTRL1_RESTART) {
+ phydev->link = 0;
+ return 0;
+ }
+ }
+
while (mmd_mask && link) {
devad = __ffs(mmd_mask);
mmd_mask &= ~BIT(devad);
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 7ddd91df99e3dc..27ebc2c6c2d0c4 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1752,7 +1752,17 @@ EXPORT_SYMBOL(genphy_aneg_done);
*/
int genphy_update_link(struct phy_device *phydev)
{
- int status;
+ int status = 0, bmcr;
+
+ bmcr = phy_read(phydev, MII_BMCR);
+ if (bmcr < 0)
+ return bmcr;
+
+ /* Autoneg is being started, therefore disregard BMSR value and
+ * report link as down.
+ */
+ if (bmcr & BMCR_ANRESTART)
+ goto done;
/* The link state is latched low so that momentary link
* drops can be detected. Do not double-read the status
--
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