net: phy: realtek: Use the dummy stubs for MMD register access for rtl8211b

[ Upstream commit 0231b1a074c672f8c00da00a57144072890d816b ]

The Ethernet on mpc8315erdb is broken since commit b6b5e8a69118
("gianfar: Disable EEE autoneg by default"). The reason is that
even though the rtl8211b doesn't support the MMD extended registers
access, it does return some random values if we trying to access
the MMD register via indirect method. This makes it seem that the
EEE is supported by this phy device. And the subsequent writing to
the MMD registers does cause the phy malfunction. So use the dummy
stubs for the MMD register access to fix this issue.

Fixes: b6b5e8a69118 ("gianfar: Disable EEE autoneg by default")
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index 9cbe645e3d89c98ca5c7974f2d0e39016e71cfa8..7d38af5ed4b5209275679dc3f2adfa56d6088a27 100644 (file)
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -138,6 +138,8 @@ static struct phy_driver realtek_drvs[] = {
                .read_status    = &genphy_read_status,
                .ack_interrupt  = &rtl821x_ack_interrupt,
                .config_intr    = &rtl8211b_config_intr,
+               .read_mmd       = &genphy_read_mmd_unsupported,
+               .write_mmd      = &genphy_write_mmd_unsupported,
        }, {
                .phy_id         = 0x001cc914,
                .name           = "RTL8211DN Gigabit Ethernet",