netdev - Re: Marvell 375 and Marvel 88E1514 Phy network problem: mvpp2 or DTS related?

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Message-ID: <fw_IlfASLLWC-FISSL4_CyGBtQ4GIHUyP2yekbr82wpiTNryNcql8NAqEdY37qE8AlZjMe4fLdo7I0yYsBaZpYhwB8Eq8GVxYNLUgcTjI7s=@proton.me>
Date: Wed, 01 Oct 2025 03:05:19 +0000
From: Zoo Moo <zoomoo100@...ton.me>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Marcin Wojtas <mw@...ihalf.com>
Subject: Re: Marvell 375 and Marvel 88E1514 Phy network problem: mvpp2 or DTS related?

On Wednesday, September 24th, 2025 at 11:33 AM, Zoo Moo <zoomoo100@...ton.me> wrote:
> 

> On Monday, 22 September 2025 at 19:22, Russell King (Oracle) linux@...linux.org.uk wrote:
> 

> > On Mon, Sep 22, 2025 at 08:58:49AM +0000, Zoo Moo wrote:
> > 

> > > Sent with Proton Mail secure email.
> > > 

> > > On Sunday, 21 September 2025 at 19:56, Russell King (Oracle) linux@...linux.org.uk wrote:
> > > 

> > > > On Sun, Sep 21, 2025 at 09:05:18AM +0000, Zoo Moo wrote:
> > > 

> > > > > Hi,
> > > 

> > > > > Bodhi from Doozan (https://forum.doozan.com) has been helping me try to get Debian to work on a Synology DS215j NAS. The DS215j is based on a Marvell Armada 375 (88F6720) and uses a Marvel 88E1514 PHY.
> > > 

> > > > Probably wrong RGMII phy-mode. I see you're using rgmii-id. Maybe that
> > > > isn't correct. Just a guess based on the problems that RGMII normally
> > > > causes.
> > > 

> > > Hi Russell,
> > > 

> > > Thanks, we did try different drivers (gmii, sgmii), but they didn't help, details in this message https://forum.doozan.com/read.php?2,138851,139291#msg-139291.
> > 

> > What I was meaning was not to try stuff like "SGMII", but try the other
> > three flavours of RGMII. In other words:
> > 

> > rgmii
> > rgmii-txid
> > rgmii-rxid
> > 

> > If u-boot works, and it's using RGMII, then it's definitely one of the
> > four flavours of RGMII interface.
> > 

> > No need to post the failures of the testing to the forums - just say
> > here whether any of those result in packet flow or not. Nothing else
> > should change - the only difference between these modes are the timings
> > of the RGMII interface, and having the wrong mode is the most common
> > reason for RGMII not working.
> > 

> > Thanks.
> > 

> > --
> > RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> > FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
> 

> 

> Thanks Russel,
> 

> I tried all flavours again (rgmii, rgmii-id, rgmii-txid and rgmii-rxid), but all resulted in the same outcome.
> 

> ifconfig shows it sends packets, but nothing is received. I cannot detect it actually sending any packets from the device though.
> 

> For example:
> 

> root@(none):~# ifconfig eth0 192.168.27.111 netmask 255.255.255.0 up hw ether 00:11:22:33:44:55
> [ 31.727773][ T2055] mvpp2 f10f0000.ethernet eth0: PHY [f10c0054.mdio-mii:01] driver [Marvell 88E1510] (irq=POLL)
> [ 31.738178][ T2055] mvpp2 f10f0000.ethernet eth0: configuring for phy/rgmii-txid link mode
> [ 36.007360][ T10] mvpp2 f10f0000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
> 

> root@(none):~# dhclient eth0
> root@(none):~# ifconfig eth0
> eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
> 

> inet 192.168.27.111 netmask 255.255.255.0 broadcast 192.168.27.255
> inet6 <IP6 ADDRESS> prefixlen 64 scopeid 0x20<link>
> 

> ether 00:11:22:33:44:55 txqueuelen 2048 (Ethernet)
> RX packets 0 bytes 0 (0.0 B)
> RX errors 0 dropped 0 overruns 0 frame 0
> TX packets 71 bytes 4858 (4.7 KiB)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
> 

> Do I need to adjust the internal delays? rx-internal-delay-ps/tx-internal-delay-ps
> 

> (reference: https://www.thegoodpenguin.co.uk/blog/linux-ethernet-phy-mode-bindings-explained/)
> 

> Is it something we can determine by looking at the Synology kernel source?


Hi,

Any other suggestions I could try to debug this issue?

Appreciate any suggestions.

Cheers,
ZM
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