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Message-ID: <20211104195828.199c58b9@thinkpad>
Date: Thu, 4 Nov 2021 19:58:28 +0100
From: Marek BehĂșn <kabel@...nel.org>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
David Miller <davem@...emloft.net>
Subject: Re: [PATCH net] net: dsa: mv88e6xxx: Don't support >1G speeds on
6191X on ports other than 10
On Thu, 4 Nov 2021 18:15:57 +0000
"Russell King (Oracle)" <linux@...linux.org.uk> wrote:
> On Thu, Nov 04, 2021 at 06:17:47PM +0100, Marek BehĂșn wrote:
> > Model 88E6191X only supports >1G speeds on port 10. Port 0 and 9 are
> > only 1G.
>
> Interesting. The original commit says:
>
> SERDESes can do USXGMII, 10GBASER and 5GBASER (on 6191X only one
> SERDES is capable of more than 1g; USXGMII is not yet supported
> with this change)
>
> which is ambiguously worded - so I guess we now know that it's only
> port 10 that supports speeds above 1G.
Yes, I just found this info in datasheet.
> Can ports 0 / 1 / 10 be changed at runtime (iow, is the C_Mode field
> writable on these ports?)
Yes, cmode is writable on these ports. serdes.c also provides some
errata fixes when changing cmode.
(BTW Russell I have already updated your patch
net: dsa: mv88e6xxx: populate supported_interfaces
from your net-queue branch.
I am rebasing your work on top of net-next and also adding some other
stuff. I will send you the patches later.)
Marek
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