netdev - [PATCH RFC net-next v2 02/10] net: dsa: mt7530: 1G can also support 1000BASE-X link mode

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Date:   Wed, 23 Feb 2022 11:34:22 +0000
From:   "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To:     Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH RFC net-next v2 02/10] net: dsa: mt7530: 1G can also support
 1000BASE-X link mode

When using an external PHY connected using RGMII to mt7531 port 5, the
PHY can be used to used support 1000BASE-X connections. Moreover, if
1000BASE-T is supported, then we should allow 1000BASE-X as well, since
which are supported is a property of the PHY.

Therefore, it makes no sense to exclude this from the linkmodes when
1000BASE-T is supported.

Fixes: c288575f7810 ("net: dsa: mt7530: Add the support of MT7531 switch")
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/dsa/mt7530.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 69abca77ea1a..e978a8a37bf5 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2534,13 +2534,8 @@ static void mt7531_sgmii_validate(struct mt7530_priv *priv, int port,
 	/* Port5 supports ethier RGMII or SGMII.
 	 * Port6 supports SGMII only.
 	 */
-	switch (port) {
-	case 5:
-		if (mt7531_is_rgmii_port(priv, port))
-			break;
-		fallthrough;
-	case 6:
-		phylink_set(supported, 1000baseX_Full);
+	if (port == 6 ||
+	    (port == 5 && !mt7531_is_rgmii_port(priv, port))) {
 		phylink_set(supported, 2500baseX_Full);
 		phylink_set(supported, 2500baseT_Full);
 	}
@@ -2908,8 +2903,6 @@ static void
 mt7530_mac_port_validate(struct dsa_switch *ds, int port,
 			 unsigned long *supported)
 {
-	if (port == 5)
-		phylink_set(supported, 1000baseX_Full);
 }
 
 static void mt7531_mac_port_validate(struct dsa_switch *ds, int port,
@@ -2946,8 +2939,10 @@ mt753x_phylink_validate(struct dsa_switch *ds, int port,
 	}
 
 	/* This switch only supports 1G full-duplex. */
-	if (state->interface != PHY_INTERFACE_MODE_MII)
+	if (state->interface != PHY_INTERFACE_MODE_MII) {
 		phylink_set(mask, 1000baseT_Full);
+		phylink_set(mask, 1000baseX_Full);
+	}
 
 	priv->info->mac_port_validate(ds, port, mask);
 
-- 
2.30.2