target/linux/generic/backport-6.6/790-53-v6.10-net-dsa-mt7530-do-not-set-MT7530_P5_DIS-when-PHY-.patch

   1 From 16e6592cd5c5bd74d8890973489f60176c692614 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Ar=C4=B1n=C3=A7=20=C3=9CNAL?= <arinc.unal@arinc9.com>
   3 Date: Sun, 28 Apr 2024 12:19:58 +0300
   4 Subject: [PATCH] net: dsa: mt7530: do not set MT7530_P5_DIS when PHY muxing is
   5  being used
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 DSA initalises the ds->num_ports amount of ports in
  11 dsa_switch_touch_ports(). When the PHY muxing feature is in use, port 5
  12 won't be defined in the device tree. Because of this, the type member of
  13 the dsa_port structure for this port will be assigned DSA_PORT_TYPE_UNUSED.
  14 The dsa_port_setup() function calls ds->ops->port_disable() when the port
  15 type is DSA_PORT_TYPE_UNUSED.
  16
  17 The MT7530_P5_DIS bit is unset in mt7530_setup() when PHY muxing is being
  18 used. mt7530_port_disable() which is assigned to ds->ops->port_disable() is
  19 called afterwards. Currently, mt7530_port_disable() sets MT7530_P5_DIS
  20 which breaks network connectivity when PHY muxing is being used.
  21
  22 Therefore, do not set MT7530_P5_DIS when PHY muxing is being used.
  23
  24 Fixes: 377174c5760c ("net: dsa: mt7530: move MT753X_MTRAP operations for MT7530")
  25 Reported-by: Daniel Golle <daniel@makrotopia.org>
  26 Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
  27 Reviewed-by: Andrew Lunn <andrew@lunn.ch>
  28 Link: https://lore.kernel.org/r/20240428-for-netnext-mt7530-do-not-disable-port5-when-phy-muxing-v2-1-bb7c37d293f8@arinc9.com
  29 Signed-off-by: Paolo Abeni <pabeni@redhat.com>
  30 ---
  31  drivers/net/dsa/mt7530.c | 3 ++-
  32  1 file changed, 2 insertions(+), 1 deletion(-)
  33
  34 --- a/drivers/net/dsa/mt7530.c
  35 +++ b/drivers/net/dsa/mt7530.c
  36 @@ -1220,7 +1220,8 @@ mt7530_port_disable(struct dsa_switch *d
  37         if (priv->id != ID_MT7530 && priv->id != ID_MT7621)
  38                 return;
  39
  40 -       if (port == 5)
  41 +       /* Do not set MT7530_P5_DIS when port 5 is being used for PHY muxing. */
  42 +       if (port == 5 && priv->p5_mode == GMAC5)
  43                 mt7530_set(priv, MT753X_MTRAP, MT7530_P5_DIS);
  44         else if (port == 6)
  45                 mt7530_set(priv, MT753X_MTRAP, MT7530_P6_DIS);