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Message-ID: <ZAhzDDjZ8+gxyo3V@shell.armlinux.org.uk>
Date: Wed, 8 Mar 2023 11:35:40 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Daniel Golle <daniel@...rotopia.org>
Cc: netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Heiner Kallweit <hkallweit1@...il.com>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Mark Lee <Mark-MC.Lee@...iatek.com>,
John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Matthias Brugger <matthias.bgg@...il.com>,
DENG Qingfang <dqfext@...il.com>,
Landen Chao <Landen.Chao@...iatek.com>,
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Paolo Abeni <pabeni@...hat.com>,
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"David S. Miller" <davem@...emloft.net>,
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Bjørn Mork <bjorn@...k.no>,
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Alexander Couzens <lynxis@...0.eu>
Subject: Re: [PATCH net-next v12 08/18] net: ethernet: mtk_eth_soc: fix
1000Base-X and 2500Base-X modes
On Tue, Mar 07, 2023 at 03:53:58PM +0000, Daniel Golle wrote:
> After conversion to phylink_pcs the 1000Base-X and 2500Base-X modes
> would work only after `ethtool -s eth1 autoneg off`.
> As ethtool autoneg and the ETHTOOL_LINK_MODE_Autoneg_BIT is supposed
> to control auto-negotiation on the external interface it doesn't make
> much sense to use it to control on-board SGMII auto-negotiation between
> MAC and PHY.
> Set correct values to really only enable SGMII auto-negotiation when
> actually operating in SGMII mode. For 1000Base-X and 2500Base-X mode,
> enable remote-fault detection only if in-band-status is enabled.
> This fixes using 1000Base-X and 2500Base-X SFPs on the BananaPi R3
> board and also makes it possible to use interface-mode-switching PHYs
> operating in either SGMII mode for 10M/100M/1000M or in 2500Base-X for
> 2500M mode on other boards.
>
> Fixes: 14a44ab0330d ("net: mtk_eth_soc: partially convert to phylink_pcs")
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
NAK.
There are PHYs out there which operate in SGMII mode but do not
exchange the SGMII 16-bit configuration word. The code implemented
here by me was explicitly to allow such a configuration to work,
which is defined as:
SGMII *without* mode == inband
An example of this is the Broadcom 84881 PHY which can be found on
SFP modules.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
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