Date:   Wed, 8 Mar 2023 12:35:08 +0000
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Frank Wunderlich <frank-w@public-files.de>
Cc:     Daniel Golle <daniel@makrotopia.org>, netdev@vger.kernel.org,
        linux-mediatek@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Lorenzo Bianconi <lorenzo@kernel.org>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        John Crispin <john@phrozen.org>, Felix Fietkau <nbd@nbd.name>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        DENG Qingfang <dqfext@gmail.com>,
        Landen Chao <Landen.Chao@mediatek.com>,
        Sean Wang <sean.wang@mediatek.com>,
        Paolo Abeni <pabeni@redhat.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        "David S. Miller" <davem@davemloft.net>,
        Vladimir Oltean <olteanv@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Vladimir Oltean <vladimir.oltean@nxp.com>,
        Jianhui Zhao <zhaojh329@gmail.com>,
        =?iso-8859-1?Q?Bj=F8rn?= Mork <bjorn@mork.no>,
        Alexander Couzens <lynxis@fe80.eu>
Subject: Re: [PATCH net-next v12 09/18] net: ethernet: mtk_eth_soc: Fix link
 status for none-SGMII modes
Message-ID: <ZAiA/ExxgHPEY15h@shell.armlinux.org.uk>
References: <cover.1678201958.git.daniel@makrotopia.org>
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On Wed, Mar 08, 2023 at 12:44:57PM +0100, Frank Wunderlich wrote:
> Am 8. M?rz 2023 12:38:31 MEZ schrieb "Russell King (Oracle)" <linux@armlinux.org.uk>:
> >On Tue, Mar 07, 2023 at 03:54:11PM +0000, Daniel Golle wrote:
> >> Link partner advertised link modes are not reported by the SerDes
> >> hardware if not operating in SGMII mode. Hence we cannot use
> >> phylink_mii_c22_pcs_decode_state() in this case.
> >> Implement reporting link and an_complete only and use speed according to
> >> the interface mode.
> >> 
> >> Fixes: 14a44ab0330d ("net: mtk_eth_soc: partially convert to phylink_pcs")
> >> Signed-off-by: Daniel Golle <daniel@makrotopia.org>
> >
> >This has been proven to work by Frank Wunderlich last October, so by
> >making this change, you will be regressing his setup.
> 
> Hi
> 
> My tests were done with 1 kind of 1g fibre sfp as i only have these atm...have ordered some 2g5 rj54 ones,but don't have them yet. I'm not sure if they are working with/without sgmii (1000base-X) and if they have builtin phy.

Fiber SFPs do not have a built in PHY. They merely convert the serdes
electrical waveform into light and back again, possibly with some
retiming of the received waveform, and a bit of monitoring. They're
pretty simple devices.

They certainly do not change the protocol in any way.

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