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Date: Tue, 23 Jan 2024 09:48:49 +0100
From: Maxime Chevallier <maxime.chevallier@bootlin.com>
To: Horatiu Vultur <horatiu.vultur@microchip.com>
Cc: <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
 <pabeni@redhat.com>, <netdev@vger.kernel.org>,
 <linux-kernel@vger.kernel.org>, <UNGLinuxDriver@microchip.com>
Subject: Re: [PATCH net] net: lan966x: Fix port configuration when using
 SGMII interface
Message-ID: <20240123094849.5ce5acc8@device-28.home>
In-Reply-To: <20240123081514.3625293-1-horatiu.vultur@microchip.com>
References: <20240123081514.3625293-1-horatiu.vultur@microchip.com>
Organization: Bootlin
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Hello Horatiu,

On Tue, 23 Jan 2024 09:15:14 +0100
Horatiu Vultur <horatiu.vultur@microchip.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@microchip.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.

>  	 */
> -	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@bootlin.com>

Thanks,

Maxime