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

[ Upstream commit 98c5f7d44f ]

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: 8f1880cbe8 ("net: dsa: bcm_sf2: Configure IMP port for 2Gb/sec")
Fixes: de34d7084e ("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>
5.4-rM2-2.2.x-imx-squashed
Florian Fainelli 2020-02-24 15:56:32 -08:00 committed by Greg Kroah-Hartman
parent 2f87f58ca9
commit 551132b294
1 changed files with 1 additions and 2 deletions
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3
drivers/net/dsa/bcm_sf2.c
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@ -69,8 +69,7 @@ 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 */