net: dsa: lantiq_gswip: fix and improve the unsupported interface error

[ Upstream commit 4d3da2d8d91f66988a829a18a0ce59945e8ae4fb ]

While trying to use the lantiq_gswip driver on one of my boards I made
a mistake when specifying the phy-mode (because the out-of-tree driver
wants phy-mode "gmii" or "mii" for the internal PHYs). In this case the
following error is printed multiple times:
  Unsupported interface: 3

While it gives at least a hint at what may be wrong it is not very user
friendly. Print the human readable phy-mode and also which port is
configured incorrectly (this hardware supports ports 0..6) to improve
the cases where someone made a mistake.

Fixes: 14fceff4771e51 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index a69c9b9878b7d5a5ec6ee7f6b87e437a09844530..636966e93517ebe34215361321c5352a1a232147 100644 (file)
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1451,7 +1451,8 @@ static void gswip_phylink_validate(struct dsa_switch *ds, int port,
 
 unsupported:
        bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
-       dev_err(ds->dev, "Unsupported interface: %d\n", state->interface);
+       dev_err(ds->dev, "Unsupported interface '%s' for port %d\n",
+               phy_modes(state->interface), port);
        return;
 }