netdev - Re: net: dsa: mv88e6xxx: Help needed: Serdes with SFP not working with mv88e6320 on Linux 5.4

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Date: Thu, 23 May 2024 23:38:08 +0000
From: Daniel Glinka <daniel.glinka@...ntys.de>
To: Andrew Lunn <andrew@...n.ch>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: net: dsa: mv88e6xxx: Help needed: Serdes with SFP not working
 with mv88e6320 on Linux 5.4

 
> On Thu, May 23, 2024 at 10:38:36PM +0000, Daniel Glinka wrote:
> > >> So, assuming you can use 6.9...
> > >
> > >> mv88e6320_ops does not have a .pcs_ops member. So the SERDES is not
> > >> getting configured. Taking a quick look at the datasheet, the SERDES
> > >> appears to be similar to the 6352 SERDES. However, the 6532 only has a
> > >> single SERDES, where as the 6320 has two of them. And they are at a
> > >> different address, 0xC and 0xD, where as the 6532 uses 0xF.
> >
> > >> You can probably use pcs-6352.c as a template in order to produce
> > >> pcs-6320.c. Actually, you might be able to extend it, adding just
> > >> 6320 specific versions of:
> > >>
> > >> const struct mv88e6xxx_pcs_ops mv88e6352_pcs_ops = {
> > >>        .pcs_init = mv88e6352_pcs_init,
> > >>        .pcs_teardown = mv88e6352_pcs_teardown,
> > >>        .pcs_select = mv88e6352_pcs_select,
> > >>};
> > >>
> > >> to the end.
> > >>
> > >>        Andrew
> > >Thanks for the suggestion! I will try this.
> > >
> > >Daniel
> >
> > I had a look at the implementation. But switching to the fiber/serdes page does not work. I did some debugging and it seems the page is not properly set in the  mv88e6xxx_phy_page_get call. The function returns 0, but if I want to read the value back I get 0xFFFF. I also tried to write to the register using the mdio-tools (https://github.com/wkz/mdio-tools) with the same behavior.  But this is only on the SERDES ports. Therefore I would assume mdio works fine.
> > I thought it was because we have no phy (cmode is 0x9). Could this be a different issue?
> 
> What MDIO address are you using? As i said, 6352 has a single SERDES
> using address 0xF. 6320 has two of them, at 0xC and 0xD.
> 
>       Andrew

I'm sorry. It is working now. I got confused between the port and phy addresses and passed the port address (0x10 and 0x11). Thanks, for your help!

Daniel