net: dsa: bcm_sf2: Forcibly configure IMP port for 1Gb/sec

[ Upstream commit 98c5f7d44fef309e692c24c6d71131ee0f0871fb ]

We are still experiencing some packet loss with the existing advanced
congestion buffering (ACB) settings with the IMP port configured for
2Gb/sec, so revert to conservative link speeds that do not produce
packet loss until this is resolved.

Fixes: 8f1880cbe8d0 ("net: dsa: bcm_sf2: Configure IMP port for 2Gb/sec")
Fixes: de34d7084edd ("net: dsa: bcm_sf2: Only 7278 supports 2Gb/sec IMP port")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index f181a28..8c69789 100644 (file)
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -73,8 +73,7 @@ static void bcm_sf2_imp_setup(struct dsa_switch *ds, int port)
                /* Force link status for IMP port */
                reg = core_readl(priv, offset);
                reg |= (MII_SW_OR | LINK_STS);
-               if (priv->type == BCM7278_DEVICE_ID)
-                       reg |= GMII_SPEED_UP_2G;
+               reg &= ~GMII_SPEED_UP_2G;
                core_writel(priv, reg, offset);
 
                /* Enable Broadcast, Multicast, Unicast forwarding to IMP port */