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Date:   Sun, 11 Aug 2019 17:08:11 +0200
From:   Marek Behún <marek.behun@....cz>
To:     netdev@...r.kernel.org
Cc:     Marek Behún <marek.behun@....cz>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: [PATCH net-next 1/2] net: dsa: mv88e6xxx: fix RGMII-ID port setup

The mv88e6xxx_port_setup_mac looks if one of the {link, speed, duplex}
parameters is being changed from the current setting, and if not, does
not do anything. This test is wrong in some situations: this method also
has the mode argument, which can also be changed.

For example on Turris Omnia, the mode is PHY_INTERFACE_MODE_RGMII_ID,
which has to be set byt the ->port_set_rgmii_delay method. The test does
not look if mode is being changed (in fact there is currently no method
to determine port mode as phy_interface_t type).

The simplest solution seems to be to drop this test altogether and
simply do the setup when requested.

Signed-off-by: Marek Behún <marek.behun@....cz>
Cc: Heiner Kallweit <hkallweit1@...il.com>
Cc: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc: Vivien Didelot <vivien.didelot@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Florian Fainelli <f.fainelli@...il.com>
Cc: David S. Miller <davem@...emloft.net>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 2e8b1ab2c6f7..aae63f6515b3 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -420,15 +420,6 @@ int mv88e6xxx_port_setup_mac(struct mv88e6xxx_chip *chip, int port, int link,
 	if (err)
 		return err;
 
-	/* Has anything actually changed? We don't expect the
-	 * interface mode to change without one of the other
-	 * parameters also changing
-	 */
-	if (state.link == link &&
-	    state.speed == speed &&
-	    state.duplex == duplex)
-		return 0;
-
 	/* Port's MAC control must not be changed unless the link is down */
 	err = chip->info->ops->port_set_link(chip, port, 0);
 	if (err)
-- 
2.21.0

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