From: Priit Laes <plaes@plaes.org>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Jose Abreu <Jose.Abreu@synopsys.com>,
"linux-sunxi@googlegroups.com" <linux-sunxi@googlegroups.com>,
"wens@csie.org" <wens@csie.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
Florian Fainelli <f.fainelli@gmail.com>,
Andrew Lunn <andrew@lunn.ch>,
Heiner Kallweit <hkallweit1@gmail.com>,
"peppe.cavallaro@st.com" <peppe.cavallaro@st.com>,
"alexandre.torgue@st.com" <alexandre.torgue@st.com>
Subject: Re: sun7i-dwmac: link detection failure with 1000Mbit parters
Date: Fri, 1 Nov 2019 09:49:20 +0000 [thread overview]
Message-ID: <20191101094920.GB12834@plaes.org> (raw)
In-Reply-To: <20191031103841.GI25745@shell.armlinux.org.uk>
On Thu, Oct 31, 2019 at 10:38:41AM +0000, Russell King - ARM Linux admin wrote:
> On Thu, Oct 31, 2019 at 08:39:06AM +0000, Jose Abreu wrote:
> > ++ Florian, Andrew, Heiner, Russell
> >
> > Can you please attach your dmesg log ? PHYLINK provides some useful
> > debug logs.
> >
> > From: Priit Laes <plaes@plaes.org>
> > Date: Oct/30/2019, 20:21:17 (UTC+00:00)
> >
> > > Heya!
> > >
> > > I have noticed that with sun7i-dwmac driver (OLinuxino Lime2 eMMC), link
> > > detection fails consistently with certain 1000Mbit partners (for example Huawei
> > > B525s-23a 4g modem ethernet outputs and RTL8153-based USB3.0 ethernet dongle),
> > > but the same hardware works properly with certain other link partners (100Mbit GL AR150
> > > for example).
> > >
> > > (Just need to test with another 1000Mbit switch at the office).
> > >
> > > I first thought it could be a regression, but I went from current master to as far back
> > > as 5.2.0-rc6 where it was still broken.
>
> The stmmac conversion to phylink was v5.3-rc1, so that's likely not the
> issue if v5.2-rc6 also exhibits this behaviour.
>
> My guess is that the problem lies in phylib, especially as the link LEDs
> go off when the link is configured. I notice that it's using the
> generic PHY driver rather than a specific driver.
Yup, it turned out to be a phy-related issue - I was using generic PHY
driver, but the board is using Micrel KSZ9031 which has some quirks that
MICREL_PHY=y managed to work around.
>
> mii-diag -v eth0
>
> would be useful to see for the case where the link has failed, without
> replugging the ethernet cable.
mii-diag seems to be quite an useful tool, but unfortunately has not been
packaged anymore on newer distro releases like Debian stable and latest
Ubuntu LTS.
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
> According to speedtest.net: 11.9Mbps down 500kbps up
next prev parent reply other threads:[~2019-11-01 9:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-30 20:21 sun7i-dwmac: link detection failure with 1000Mbit parters Priit Laes
2019-10-31 8:39 ` Jose Abreu
2019-10-31 10:38 ` Russell King - ARM Linux admin
2019-11-01 9:49 ` Priit Laes [this message]
2019-11-01 10:57 ` Russell King - ARM Linux admin
2019-10-31 13:04 ` Andrew Lunn
2019-10-31 13:14 ` Andrew Lunn
2019-10-31 16:19 ` Priit Laes
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