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    Subject[PATCH 5.10 133/663] net: amd-xgbe: Fix network fluctuations when using 1G BELFUSE SFP
    Date
    From: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>

    [ Upstream commit 9eab3fdb419916f66a72d1572f68d82cd9b3f963 ]

    Frequent link up/down events can happen when a Bel Fuse SFP part is
    connected to the amd-xgbe device. Try to avoid the frequent link
    issues by resetting the PHY as documented in Bel Fuse SFP datasheets.

    Fixes: e722ec82374b ("amd-xgbe: Update the BelFuse quirk to support SGMII")
    Co-developed-by: Sudheesh Mavila <sudheesh.mavila@amd.com>
    Signed-off-by: Sudheesh Mavila <sudheesh.mavila@amd.com>
    Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
    Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
    index d3f72faecd1da..18e48b3bc402b 100644
    --- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
    +++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
    @@ -922,6 +922,9 @@ static bool xgbe_phy_belfuse_phy_quirks(struct xgbe_prv_data *pdata)
    if ((phy_id & 0xfffffff0) != 0x03625d10)
    return false;

    + /* Reset PHY - wait for self-clearing reset bit to clear */
    + genphy_soft_reset(phy_data->phydev);
    +
    /* Disable RGMII mode */
    phy_write(phy_data->phydev, 0x18, 0x7007);
    reg = phy_read(phy_data->phydev, 0x18);
    --
    2.27.0


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