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Miller" , Jakub Kicinski , netdev@vger.kernel.org Cc: Sudheesh.Mavila@amd.com, Shyam Sundar S K , Sudheesh Mavila Subject: [PATCH 4/4] amd-xgbe: Fix network fluctuations when using 1G BELFUSE SFP Date: Fri, 12 Feb 2021 23:30:10 +0530 Message-Id: <20210212180010.221129-5-Shyam-sundar.S-k@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210212180010.221129-1-Shyam-sundar.S-k@amd.com> References: <20210212180010.221129-1-Shyam-sundar.S-k@amd.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [165.204.156.251] X-ClientProxiedBy: MAXPR01CA0089.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:49::31) To SN1PR12MB2495.namprd12.prod.outlook.com (2603:10b6:802:32::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from jatayu.amd.com (165.204.156.251) by MAXPR01CA0089.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:49::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3846.27 via Frontend Transport; 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Try to avoid the frequent link issues by resetting the PHY as documented in Bel Fuse SFP datasheets. Signed-off-by: Sudheesh Mavila Signed-off-by: Shyam Sundar S K --- drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c index 1bb468ac9635..e328fd9bd294 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c @@ -922,6 +922,12 @@ 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 */ + reg = phy_read(phy_data->phydev, 0x00); + phy_write(phy_data->phydev, 0x00, reg | 0x8000); + read_poll_timeout(phy_read, reg, !(reg & 0x8000) || reg < 0, + 10000, 50000, true, phy_data->phydev, 0x0); + /* Disable RGMII mode */ phy_write(phy_data->phydev, 0x18, 0x7007); reg = phy_read(phy_data->phydev, 0x18); -- 2.25.1