Just found similar problem fixed in another PHY. See commit 99f81afc139c
("phy: micrel: Disable auto negotiation on startup»)
> 19 апр. 2017 г., в 16:46, Alexander Kochetkov <al.koc...@gmail.com>
> написал(а):
>
> The problem I fix related to SMSC LAN8710/LAN8720 PHY handled using
> interrupts. During power-up cycle the PHY do auto-negotiation, generate
> interrupt and set BMSR_ANEGCOMPLETE flag. Interrupt is handled by PHY
> state machine but doesn't update link because PHY is in PHY_READY state.
> After some time MAC bring up and connect with PHY. It start PHY using
> phy_start(). During startup PHY change state to PHY_AN but doesn't
> set BMCR_ANRESTART flag due to genphy_config_aneg() doesn't update MII_BMCR
> because there no new to advertising. As a result, state machine wait for
> interrupt from PHY and nether get "link is up". Because BMSR_ANEGCOMPLETE
> already set the patch schedule check link without waiting interrupt.
> In case genphy_config_aneg() update MII_BMCR and set BMCR_ANRESTART
> flag, BMSR_ANEGCOMPLETE will be cleared and state machine will continue
> on auto-negotiation interrupt.
>
> Signed-off-by: Alexander Kochetkov <al.koc...@gmail.com>
> ---
> drivers/net/phy/phy.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
> index 7cc1b7d..da8f03d 100644
> --- a/drivers/net/phy/phy.c
> +++ b/drivers/net/phy/phy.c
> @@ -1169,6 +1169,18 @@ void phy_state_machine(struct work_struct *work)
> if (phydev->irq == PHY_POLL)
> queue_delayed_work(system_power_efficient_wq,
> &phydev->state_queue,
> PHY_STATE_TIME * HZ);
> +
> + /* Re-schedule a PHY state machine to check PHY status because
> + * negotiation already done and aneg interrupt may not be generated.
> + */
> + if (needs_aneg && (phydev->irq > 0) && (phydev->state == PHY_AN)) {
> + err = phy_aneg_done(phydev);
> + if (err > 0)
> + queue_delayed_work(system_power_efficient_wq,
> + &phydev->state_queue, 0);
> + if (err < 0)
> + phy_error(phydev);
> + }
> }
>
> /**
> --
> 1.7.9.5
>
