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Message-Id: <20230405203859.391267-3-arinc.unal@arinc9.com>
Date: Wed, 5 Apr 2023 23:38:49 +0300
From: arinc9.unal@...il.com
To: René van Dorst <opensource@...rst.com>,
Sean Wang <sean.wang@...iatek.com>,
Landen Chao <Landen.Chao@...iatek.com>,
DENG Qingfang <dqfext@...il.com>,
Daniel Golle <daniel@...rotopia.org>,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Russell King <linux@...linux.org.uk>
Cc: Arınç ÜNAL <arinc.unal@...nc9.com>,
Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
Richard van Schagen <richard@...terhints.com>,
Richard van Schagen <vschagen@...com>,
Frank Wunderlich <frank-w@...lic-files.de>,
erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: [RFC PATCH net-next 02/12] net: dsa: mt7530: fix phylink for port 5 and fix port 5 modes
From: Arınç ÜNAL <arinc.unal@...nc9.com>
There're two code paths for setting up port 5:
mt7530_setup()
-> mt7530_setup_port5()
mt753x_phylink_mac_config()
-> mt753x_mac_config()
-> mt7530_mac_config()
-> mt7530_setup_port5()
The first code path is supposed to run when PHY muxing is being used. In
this case, port 5 is somewhat of a hidden port. It won't be defined on the
devicetree so phylink can't be used to manage the port.
The second code path used to call mt7530_setup_port5() directly under case
5 on mt7530_phylink_mac_config() before it was moved to mt7530_mac_config()
with 88bdef8be9f6 ("net: dsa: mt7530: Extend device data ready for adding a
new hardware"). mt7530_setup_port5() will never run through this code path
because the current code on mt7530_setup() bypasses phylink for all cases
of port 5.
Fix this by leaving it to phylink if port 5 is used as a CPU, DSA, or user
port. For the cases of PHY muxing or the port being disabled, call
mt7530_setup_port5() directly from mt7530_setup() without involving
phylink.
Move setting the interface and P5_DISABLED mode to a more specific
location. They're supposed to be overwritten if PHY muxing is detected.
Add comments which explain the process.
Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>
Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
---
drivers/net/dsa/mt7530.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 31ef70f0cd12..a00aabe4987e 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2288,16 +2288,19 @@ mt7530_setup(struct dsa_switch *ds)
return ret;
/* Setup port 5 */
- priv->p5_intf_sel = P5_DISABLED;
- interface = PHY_INTERFACE_MODE_NA;
-
if (!dsa_is_unused_port(ds, 5)) {
+ /* Set the interface selection of port 5 to GMAC5 when it's used
+ * as a CPU, DSA, or user port. Let phylink handle the rest.
+ */
priv->p5_intf_sel = P5_INTF_SEL_GMAC5;
- ret = of_get_phy_mode(dsa_to_port(ds, 5)->dn, &interface);
- if (ret && ret != -ENODEV)
- return ret;
} else {
- /* Scan the ethernet nodes. look for GMAC1, lookup used phy */
+ /* Scan the ethernet nodes. Look for GMAC1, lookup the used PHY.
+ * Set priv->p5_intf_sel to P5_DISABLED first, then overwrite it
+ * if PHY muxing is detected.
+ */
+ priv->p5_intf_sel = P5_DISABLED;
+ interface = PHY_INTERFACE_MODE_NA;
+
for_each_child_of_node(dn, mac_np) {
if (!of_device_is_compatible(mac_np,
"mediatek,eth-mac"))
@@ -2328,6 +2331,8 @@ mt7530_setup(struct dsa_switch *ds)
of_node_put(phy_node);
break;
}
+
+ mt7530_setup_port5(ds, interface);
}
#ifdef CONFIG_GPIOLIB
@@ -2338,8 +2343,6 @@ mt7530_setup(struct dsa_switch *ds)
}
#endif /* CONFIG_GPIOLIB */
- mt7530_setup_port5(ds, interface);
-
/* Flush the FDB table */
ret = mt7530_fdb_cmd(priv, MT7530_FDB_FLUSH, NULL);
if (ret < 0)
--
2.37.2
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