linux-kernel - Re: [PATCH net] net: lan966x: Fix port configuration when using SGMII interface

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Date: Tue, 23 Jan 2024 11:03:19 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net] net: lan966x: Fix port configuration when using
 SGMII interface

The 01/23/2024 09:48, Maxime Chevallier wrote:
> 
> Hello Horatiu,

Hi Maxime,

> 
> On Tue, 23 Jan 2024 09:15:14 +0100
> Horatiu Vultur <horatiu.vultur@...rochip.com> wrote:
> 
> > In case the interface between the MAC and the PHY is SGMII, then the bit
> > GIGA_MODE on the MAC side needs to be set regardless of the speed at
> > which it is running.
> >
> > Fixes: d28d6d2e37d1 ("net: lan966x: add port module support")
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> > ---
> >  drivers/net/ethernet/microchip/lan966x/lan966x_port.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_port.c b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
> > index 92108d354051c..975a6d64a2e18 100644
> > --- a/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
> > +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
> > @@ -170,7 +170,8 @@ static void lan966x_port_link_up(struct lan966x_port *port)
> >       /* Also the GIGA_MODE_ENA(1) needs to be set regardless of the
> >        * port speed for QSGMII ports.
> 
> Small nit, I think this comment above the test could also be updated to
> reflect that change.

Ah... yes, you are right. I will update this in the next version.

> 
> >        */
> > -     if (phy_interface_num_ports(config->portmode) == 4)
> > +     if (phy_interface_num_ports(config->portmode) == 4 ||
> > +         config->portmode == PHY_INTERFACE_MODE_SGMII)
> >               mode = DEV_MAC_MODE_CFG_GIGA_MODE_ENA_SET(1);
> >
> >       lan_wr(config->duplex | mode,
> 
> Besides that,
> 
> Reviewed-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> 
> Thanks,
> 
> Maxime

-- 
/Horatiu