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Message-ID: <ZuKRzWTi2lIbBl0/@HYD-DK-UNGSW21.microchip.com>
Date: Thu, 12 Sep 2024 12:31:33 +0530
From: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
CC: Andrew Lunn <andrew@...n.ch>, Raju Lakkaraju
<Raju.Lakkaraju@...rochip.com>, <netdev@...r.kernel.org>,
<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <bryan.whitehead@...rochip.com>,
<UNGLinuxDriver@...rochip.com>, <linux@...linux.org.uk>,
<rdunlap@...radead.org>, <Steen.Hegelund@...rochip.com>,
<daniel.machon@...rochip.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next V2 5/5] net: lan743x: Add Support for 2.5G SFP
with 2500Base-X Interface
The 09/11/2024 22:01, Maxime Chevallier wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> On Wed, 11 Sep 2024 19:31:01 +0200
> Andrew Lunn <andrew@...n.ch> wrote:
>
> > > @@ -3359,6 +3362,7 @@ static int lan743x_phylink_create(struct lan743x_adapter *adapter)
> > > lan743x_phy_interface_select(adapter);
> > >
> > > switch (adapter->phy_interface) {
> > > + case PHY_INTERFACE_MODE_2500BASEX:
> > > case PHY_INTERFACE_MODE_SGMII:
> > > __set_bit(PHY_INTERFACE_MODE_SGMII,
> > > adapter->phylink_config.supported_interfaces);
> >
> > I _think_ you also need to set the PHY_INTERFACE_MODE_2500BASEX bit in
> > phylink_config.supported_interfaces if you actually support it.
>
> It's actually being set a bit below. However that raises the
> question of why.
>
> On the variant that don't have this newly-introduced SFP support but do
> have sgmii support (!is_sfp_support_en && is_sgmii_en), can this chip
> actually support 2500BaseX ?
Yes.
PCI11010/PCI11414 chip's PCS support SGMII/2500Baxe-X I/F at 2.5Gpbs
We need to over clocking at a bit rate of 3.125 Gbps for 2.5Gbps event SGMII
I/F
>From data sheet:
"The SGMII interface also supports over clocking at a bit rate of 3.125 Gbps for an effective 2.5 Gbps data rate. 10 and
100 Mbps modes are also scaled up by 2.5x but are most likely not useful."
>
> If so, is there a point in getting a different default interface
> returned from lan743x_phy_interface_select() depending on wether or not
> there's SFP support ?
Yes.
This LAN743x driver support following chips
1. LAN7430 - GMII I/F
2. LAN7431 - MII I/F
3. PCI11010/PCI11414 - RGMII or SGMII/1000Base-X/2500Base-X
>
> Maxime
>
--
Thanks,
Raju
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