[PATCH net] net: phy: meson-gxl: use MMD access dummy stubs for GXL, internal PHY

From: Heiner Kallweit <hkallweit1@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	David Miller <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Eric Dumazet <edumazet@google.com>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Kevin Hilman <khilman@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"open list:ARM/Amlogic Meson..."
	<linux-amlogic@lists.infradead.org>,
	Chris Healy <cphealy@gmail.com>
Subject: [PATCH net] net: phy: meson-gxl: use MMD access dummy stubs for GXL, internal PHY
Date: Tue, 31 Jan 2023 22:03:21 +0100	[thread overview]
Message-ID: <23ecd290-56fb-699a-8722-f405b723b763@gmail.com> (raw)

Jerome provided the information that also the GXL internal PHY doesn't
support MMD register access and EEE. MMD reads return 0xffff, what
results in e.g. completely wrong ethtool --show-eee output.
Therefore use the MMD dummy stubs.

Note: The Fixes tag references the commit that added the MMD dummy
access stubs.

Fixes: 5df7af85ecd8 ("net: phy: Add general dummy stubs for MMD register access")
Suggested-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/meson-gxl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index c49062ad7..fbf5f2416 100644
--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -261,6 +261,8 @@ static struct phy_driver meson_gxl_phy[] = {
 		.handle_interrupt = meson_gxl_handle_interrupt,
 		.suspend        = genphy_suspend,
 		.resume         = genphy_resume,
+		.read_mmd	= genphy_read_mmd_unsupported,
+		.write_mmd	= genphy_write_mmd_unsupported,
 	}, {
 		PHY_ID_MATCH_EXACT(0x01803301),
 		.name		= "Meson G12A Internal PHY",
-- 
2.39.1


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