linux-kernel - Re: [PATCH net-next 1/6] net: phy: dp83869: Disable autonegotiation in RGMII/1000Base-X mode

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Date: Tue, 02 Jul 2024 10:44:12 +0200
From: Romain Gantois <romain.gantois@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject:
 Re: [PATCH net-next 1/6] net: phy: dp83869: Disable autonegotiation in
 RGMII/1000Base-X mode

On lundi 1 juillet 2024 18:40:24 UTC+2 Andrew Lunn wrote:
> On Mon, Jul 01, 2024 at 10:51:03AM +0200, Romain Gantois wrote:
> > Currently, the DP83869 driver only disables autonegotiation in fiber
> > configurations for 100Base-FX mode. However, the DP83869 PHY does not
> > support autonegotiation in any of its fiber modes.
> > 
> > Disable autonegotiation for all fiber modes.
> 
> I'm assuming to does work in copper mode?

I'm unable to test any of the copper modes for the DP83869HM but
according to the datasheet, autonegotiation should work in those.

To be clear, "fiber mode" in the DP83869 linguo also includes
1000Base-X which can be used with a direct-attach copper cable. From
what I've seen, autonegotiation is not supported in this configuration.

Thanks,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com