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Message-ID: <20190121105206.mxxxosytk5qiysc2@e5254000004ec.dyn.armlinux.org.uk> Date: Mon, 21 Jan 2019 10:52:06 +0000 From: Russell King - ARM Linux admin <linux@...linux.org.uk> To: Maxime Chevallier <maxime.chevallier@...tlin.com> Cc: Andrew Lunn <andrew@...n.ch>, davem@...emloft.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>, Heiner Kallweit <hkallweit1@...il.com>, linux-arm-kernel@...ts.infradead.org, Antoine Tenart <antoine.tenart@...tlin.com>, thomas.petazzoni@...tlin.com, gregory.clement@...tlin.com, miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com, mw@...ihalf.com Subject: Re: [PATCH net-next 5/7] net: phy: marvell10g: Force reading of 2.5/5G PMA extended abilities On Mon, Jan 21, 2019 at 11:35:31AM +0100, Maxime Chevallier wrote: > Hello Andrew, > > On Sun, 20 Jan 2019 20:08:09 +0100 > Andrew Lunn <andrew@...n.ch> wrote: > > >On Fri, Jan 18, 2019 at 04:23:50PM +0100, Maxime Chevallier wrote: > >> As per 802.3bz, if bit 14 of (1.11) "PMA Extended Abilities" indicates > >> whether or not we should read register (1.21) "2.52/5G PMA Extended > >> Abilities", which contains information on the support of 2.5GBASET and > >> 5GBASET. > >> > >> After testing on several variants of PHYS of this family, it appears > >> that bit 14 in (1.11) isn't always set when it should be. > >> > >> PHYs 88X3310 (on MacchiatoBin) and 88E2010 do support 2.5G and 5GBASET, > >> but don't have 1.11.14 set. Their register 1.21 is filled with the > >> correct values, indicating 2.5G and 5G support. > >> > >> PHYs 88X2110 do have their 1.11.14 bit set, as it should. > > > >Hi Maxime > > > >Is there anything about this in any Errata? > > I haven't seen any Errata on that unfortunately. > > I also thought about reading (1.4) "PMA/PMD Speed Ability", but the > 2.5G and 5G speeds are also reported as not being supported on the > 88X3310. It's entirely possible that the 3310 switches to different hardware blocks for 2.5G and 5G speeds, and reading _just_ the 1.4 register is not sufficient. The 88x3310 is multiple PHY devices in one package, with a CPU that manages the routing between each individual device. -- 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
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