From: Lukas Wunner lukas@wunner.de
commit 2642cc6c3bbe0900ba15bab078fd15ad8baccbc5 upstream.
Simon reports that if two LAN9514 USB adapters are directly connected without an intermediate switch, the link fails to come up and link LEDs remain dark. The issue was introduced by commit 1ce8b37241ed ("usbnet: smsc95xx: Forward PHY interrupts to PHY driver to avoid polling").
The PHY suffers from a known erratum wherein link detection becomes unreliable if Energy Detect Power-Down is used. In poll mode, the driver works around the erratum by briefly disabling EDPD for 640 msec to detect a neighbor, then re-enabling it to save power.
In interrupt mode, no interrupt is signaled if EDPD is used by both link partners, so it must not be enabled at all.
We'll recoup the power savings by enabling SUSPEND1 mode on affected LAN95xx chips in a forthcoming commit.
Fixes: 1ce8b37241ed ("usbnet: smsc95xx: Forward PHY interrupts to PHY driver to avoid polling") Reported-by: Simon Han z.han@kunbus.com Signed-off-by: Lukas Wunner lukas@wunner.de Link: https://lore.kernel.org/r/439a3f3168c2f9d44b5fd9bb8d2b551711316be6.165571443... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/smsc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/net/phy/smsc.c +++ b/drivers/net/phy/smsc.c @@ -110,7 +110,7 @@ static int smsc_phy_config_init(struct p struct smsc_phy_priv *priv = phydev->priv; int rc;
- if (!priv->energy_enable) + if (!priv->energy_enable || phydev->irq != PHY_POLL) return 0;
rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS); @@ -210,6 +210,8 @@ static int lan95xx_config_aneg_ext(struc * response on link pulses to detect presence of plugged Ethernet cable. * The Energy Detect Power-Down mode is enabled again in the end of procedure to * save approximately 220 mW of power if cable is unplugged. + * The workaround is only applicable to poll mode. Energy Detect Power-Down may + * not be used in interrupt mode lest link change detection becomes unreliable. */ static int lan87xx_read_status(struct phy_device *phydev) { @@ -217,7 +219,7 @@ static int lan87xx_read_status(struct ph
int err = genphy_read_status(phydev);
- if (!phydev->link && priv->energy_enable) { + if (!phydev->link && priv->energy_enable && phydev->irq == PHY_POLL) { /* Disable EDPD to wake up PHY */ int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS); if (rc < 0)