From b4d78731b34bd6bfd1bfedce26a55e3582b0bc14 Mon Sep 17 00:00:00 2001 From: "Russell King (Oracle)" Date: Tue, 7 Jun 2022 12:28:52 +0100 Subject: [PATCH] net: dsa: mv88e6xxx: correctly report serdes link failure Phylink wants to know if the link has dropped since the last time state was retrieved, and the BMSR gives us that. Read the BMSR and use it when deciding the link state. Fill in the an_complete member as well for the emulated PHY state. Signed-off-by: Russell King (Oracle) Signed-off-by: Jakub Kicinski --- drivers/net/dsa/mv88e6xxx/serdes.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c index 47bf87d530b0..d94150d8f3f4 100644 --- a/drivers/net/dsa/mv88e6xxx/serdes.c +++ b/drivers/net/dsa/mv88e6xxx/serdes.c @@ -53,6 +53,14 @@ static int mv88e6xxx_serdes_pcs_get_state(struct mv88e6xxx_chip *chip, u16 bmsr, u16 lpa, u16 status, struct phylink_link_state *state) { + state->link = false; + + /* If the BMSR reports that the link had failed, report this to + * phylink. + */ + if (!(bmsr & BMSR_LSTATUS)) + return 0; + state->link = !!(status & MV88E6390_SGMII_PHY_STATUS_LINK); state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);