netdev - Re: [PATCH] net: phy: marvell: fix Marvell 88E1512 used in SGMII mode

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Message-ID: <61950d83-cbe1-6e1b-4afc-bc471b386ff3@gmail.com>
Date:   Tue, 10 Jan 2017 15:24:11 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Charles-Antoine Couret <charles-antoine.couret@...vision.fr>,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: phy: marvell: fix Marvell 88E1512 used in SGMII mode

On 01/10/2017 03:13 PM, Russell King wrote:
> When an Marvell 88E1512 PHY is connected to a nic in SGMII mode, the
> fiber page is used for the SGMII host-side connection.  The PHY driver
> notices that SUPPORTED_FIBRE is set, so it tries reading the fiber page
> for the link status, and ends up reading the MAC-side status instead of
> the outgoing (copper) link.  This leads to incorrect results reported
> via ethtool.
> 
> If the PHY is connected via SGMII to the host, ignore the fiber page.
> However, continue to allow the existing power management code to
> suspend and resume the fiber page.
> 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

Fixes: 6cfb3bcc0641 ("Marvell phy: check link status in case of fiber
link.")
-- 
Florian