linux-kernel - RE: [PATCH v3 1/2] net: phy: Fix PHY AN done state machine for interrupt driven PHYs

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Message-ID: <HE1PR04MB11297FBF0E8E2739253E0A44EC340@HE1PR04MB1129.eurprd04.prod.outlook.com>
Date:   Thu, 30 Mar 2017 12:59:14 +0000
From:   Madalin-Cristian Bucur <madalin.bucur@....com>
To:     Roger Quadros <rogerq@...com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "andrew@...n.ch" <andrew@...n.ch>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kyle.roeschley@...com" <kyle.roeschley@...com>,
        "nsekhar@...com" <nsekhar@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable # v4 . 9+" <stable@...r.kernel.org>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: RE: [PATCH v3 1/2] net: phy: Fix PHY AN done state machine for
 interrupt driven PHYs

On March 27, 2017 2:59 PM, Roger Quadros wrote:
> The Ethernet link on an interrupt driven PHY was not coming up if the
> Ethernet cable was plugged before the Ethernet interface was brought up.
> 
> 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().
> There is no way of knowing in phy.c whether auto-negotiation was
> restarted or not by the PHY driver so we just wait for the next
> poll/interrupt to update the PHY state machine.
> 
> 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>
> ---
> v3: Fix typo in commit message
> 
>  drivers/net/phy/phy.c | 4 ++++
>  1 file changed, 4 insertions(+)

Tested-by: Madalin Bucur <madalin.bucur@....com>