linux-kernel - [PATCH 5.4 267/309] net: dsa: bcm_sf2: Only 7278 supports 2Gb/sec IMP port

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Date:   Mon, 10 Feb 2020 04:33:43 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 267/309] net: dsa: bcm_sf2: Only 7278 supports 2Gb/sec IMP port

From: Florian Fainelli <f.fainelli@...il.com>

[ Upstream commit de34d7084edd069dac5aa010cfe32bd8c4619fa6 ]

The 7445 switch clocking profiles do not allow us to run the IMP port at
2Gb/sec in a way that it is reliable and consistent. Make sure that the
setting is only applied to the 7278 family.

Fixes: 8f1880cbe8d0 ("net: dsa: bcm_sf2: Configure IMP port for 2Gb/sec")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/dsa/bcm_sf2.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -68,7 +68,9 @@ static void bcm_sf2_imp_setup(struct dsa
 
 		/* Force link status for IMP port */
 		reg = core_readl(priv, offset);
-		reg |= (MII_SW_OR | LINK_STS | GMII_SPEED_UP_2G);
+		reg |= (MII_SW_OR | LINK_STS);
+		if (priv->type == BCM7278_DEVICE_ID)
+			reg |= GMII_SPEED_UP_2G;
 		core_writel(priv, reg, offset);
 
 		/* Enable Broadcast, Multicast, Unicast forwarding to IMP port */