netdev - Re: [PATCH net 1/2] net: dsa: sja1105: fix SGMII PCS being forced to SPEED_UNKNOWN instead of SPEED

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Date:   Thu, 4 Mar 2021 14:32:32 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net 1/2] net: dsa: sja1105: fix SGMII PCS being forced to
 SPEED_UNKNOWN instead of SPEED_10

On Thu, Mar 04, 2021 at 12:56:53PM +0200, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> When using MLO_AN_PHY or MLO_AN_FIXED, the MII_BMCR of the SGMII PCS is
> read before resetting the switch so it can be reprogrammed afterwards.
> This works for the speeds of 1Gbps and 100Mbps, but not for 10Mbps,
> because SPEED_10 is actually 0, so AND-ing anything with 0 is false,
> therefore that last branch is dead code.
> 
> Do what others do (genphy_read_status_fixed, phy_mii_ioctl) and just
> remove the check for SPEED_10, let it fall into the default case.
> 
> Fixes: ffe10e679cec ("net: dsa: sja1105: Add support for the SGMII port")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew