linux-kernel - [PATCH 0/2] net: dsa: lantiq_gswip: two fixes for -net/-stable

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Message-Id: <20210103012544.3259029-1-martin.blumenstingl@googlemail.com>
Date:   Sun,  3 Jan 2021 02:25:42 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     hauke@...ke-m.de, netdev@...r.kernel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 0/2] net: dsa: lantiq_gswip: two fixes for -net/-stable

While testing the lantiq_gswip driver in OpenWrt at least one board had
a non-working Ethernet port connected to an internal 100Mbit/s PHY22F
GPHY. The problem which could be observed:
- the PHY would detect the link just fine
- ethtool stats would see the TX counter rise
- the RX counter in ethtool was stuck at zero

It turns out that two independent patches are needed to fix this:
- first we need to enable the MII data lines also for internal PHYs
- second we need to program the GSWIP_MII_CFG registers for all ports
  except the CPU port

These two patches have also been tested by back-porting them on top of
Linux 5.4.86 in OpenWrt.

Special thanks to Hauke for debugging and brainstorming this on IRC
with me!


Martin Blumenstingl (2):
  net: dsa: lantiq_gswip: Enable GSWIP_MII_CFG_EN also for internal PHYs
  net: dsa: lantiq_gswip: Fix GSWIP_MII_CFG(p) register access

 drivers/net/dsa/lantiq_gswip.c | 27 +++++++--------------------
 1 file changed, 7 insertions(+), 20 deletions(-)

-- 
2.30.0