netdev - Re: [PATCH] Revert "net: phy: marvell: avoid pause mode on SGMII-to-Copper for 88e151x"

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Message-ID: <20190126155834.GA24361@lunn.ch>
Date:   Sat, 26 Jan 2019 16:58:34 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] Revert "net: phy: marvell: avoid pause mode on
 SGMII-to-Copper for 88e151x"

On Fri, Jan 25, 2019 at 11:27:57PM +0000, Russell King wrote:
> This reverts commit 6623c0fba10ef45b64ca213ad5dec926f37fa9a0.
> 
> The original diagnosis was incorrect: it appears that the NIC had
> PHY polling mode enabled, which meant that it overwrote the PHYs
> advertisement register during negotiation.

Hi Russell

The NIC wrote to PHY registers? The NIC reading the PHY in hardware is
bad enough, but changing register as well is not good.

What NIC is this? And do you have further patches to really disable
PHY polling?
 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew