Messages in this thread | | | From | Bjørn Mork <> | Subject | Re: [PATCH v2] net: mtk_sgmii: implement mtk_pcs_ops | Date | Mon, 16 Jan 2023 15:45:24 +0100 |
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"Russell King (Oracle)" <linux@armlinux.org.uk> writes: > On Mon, Jan 16, 2023 at 02:08:30PM +0100, Bjørn Mork wrote: >> Frank Wunderlich <frank-w@public-files.de> writes: >> >> > apart from this little problem it works much better than it actually is so imho more >> > people should test it on different platforms. >> >> Hello! I've been banging my head against an MT7986 board with two >> Maxlinear GPY211C phys for a while. One of those phys is connected to >> port 5 of the MT7531 switch. This is working perfectly. >> >> The other GPY211C is connected to the second MT7986 mac. This one is >> giving me a headache... >> >> I can only get the port to work at 2500Mb/s. Changing the speed to >> anything lower looks fine in ethtool etc, but traffic is blocked. > > My guess would be that the GPY PHY is using in-band SGMII negotiation > (it sets VSPEC1_SGMII_ANEN_ANRS when entering SGMII mode and clears > it in 2500base-X), but as the link is not using in-band mode on the > PCS side, the PHY never sees its in-band negotiation complete, so the > link between PCS and PHY never comes up. > > Both sides need to agree on that detail.
Any hints on how I would go about doing that? I am a little lost here, changing arbitrary bits I don't understand the meaning of.
Bjørn
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