netdev - Re: [PATCH v2 1/2] net: phy: Fix PHY AN done state machine for interrupt driven PHYs

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Message-ID: <fb34f546-f7a7-f09a-b301-af3fdc1709c0@cogentembedded.com>
Date:   Thu, 23 Mar 2017 12:52:10 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Roger Quadros <rogerq@...com>, f.fainelli@...il.com
Cc:     andrew@...n.ch, davem@...emloft.net, kyle.roeschley@...com,
        nsekhar@...com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "stable # v4 . 9+" <stable@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] net: phy: Fix PHY AN done state machine for
 interrupt driven PHYs

Hello!

On 3/22/2017 2:02 PM, Roger Quadros wrote:

> he ethernet link on an interrupt driven PHY was not coming up if the

    s/he/The/?

> ethernet cable was plugged before the ethernet interface was brought up.

    Also, my spell checker trips on "ethernet", perhaps should be capitalized?

> The PHY state machine seems to be stuck from RUNNING to AN state
> with no new interrupts from the PHY. So it doesn't know when the
> PHY Auto-negotiation has been completed and doesn't transition to RUNNING
> state with ANEG done thus netif_carrier_on() is never called.
>
> NOTE: genphy_config_aneg() will not restart PHY Auto-negotiation of
> advertisement parameters didn't change.
>
> Fix this by scheduling the PHY state machine in phy_start_aneg().
>
> Fixes: 3c293f4e08b5 ("net: phy: Trigger state machine on state change and not polling.")
> Cc: stable <stable@...r.kernel.org> # v4.9+
> Signed-off-by: Roger Quadros <rogerq@...com>
[...]

MBR, Sergei