linux-kernel - Re: [PATCH net] net: phy: Fix qca8081 with speeds lower than 2.5Gb/s

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Date:   Sun, 30 Jan 2022 12:40:57 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Jonathan McDowell <noodles@...th.li>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Luo Jie <luoj@...eaurora.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Robert Marko <robimarko@...il.com>
Subject: Re: [PATCH net] net: phy: Fix qca8081 with speeds lower than 2.5Gb/s

On Sun, Jan 30, 2022 at 10:25:28AM +0000, Jonathan McDowell wrote:
> A typo in qca808x_read_status means we try to set SMII mode on the port
> rather than SGMII when the link speed is not 2.5Gb/s. This results in no
> traffic due to the mismatch in configuration between the phy and the
> mac.
> 
> Fixes: 79c7bc0521545 ("net: phy: add qca8081 read_status")
> Signed-off-by: Jonathan McDowell <noodles@...th.li>
> ---
>  drivers/net/phy/at803x.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index 5b6c0d120e09..7077e3a92d31 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -1691,7 +1691,7 @@ static int qca808x_read_status(struct phy_device *phydev)
>  	if (phydev->link && phydev->speed == SPEED_2500)
>  		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
>  	else
> -		phydev->interface = PHY_INTERFACE_MODE_SMII;
> +		phydev->interface = PHY_INTERFACE_MODE_SGMII;

Is it intentional to set the interface to SGMII also when there is no
link?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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