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Wed, 27 Dec 2023 15:17:00 -0800 From: Asmaa Mnebhi To: , , CC: Asmaa Mnebhi , , Subject: [PATCH v2 1/1] net: phy: micrel: Add workaround for incomplete autonegotiation Date: Wed, 27 Dec 2023 18:16:57 -0500 Message-ID: <20231227231657.15152-1-asmaa@nvidia.com> X-Mailer: git-send-email 2.30.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF0000150A:EE_|BY5PR12MB4180:EE_ X-MS-Office365-Filtering-Correlation-Id: 615197c9-3748-4169-a05a-08dc0731ef05 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(376002)(39850400004)(136003)(396003)(346002)(230922051799003)(1800799012)(64100799003)(451199024)(186009)(82310400011)(36840700001)(46966006)(316002)(26005)(8676002)(8936002)(478600001)(1076003)(7696005)(86362001)(2616005)(36756003)(336012)(82740400003)(7636003)(6666004)(36860700001)(356005)(426003)(54906003)(110136005)(47076005)(41300700001)(70586007)(70206006)(5660300002)(40480700001)(2906002)(4326008);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Dec 2023 23:17:02.3433 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 615197c9-3748-4169-a05a-08dc0731ef05 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF0000150A.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4180 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786478902789493783 X-GMAIL-MSGID: 1786478902789493783 Very rarely, the KSZ9031 fails to complete autonegotiation although it was initiated via phy_start(). As a result, the link stays down. Restarting autonegotiation when in this state solves the issue. Signed-off-by: Asmaa Mnebhi --- v1->v2: - Use msleep() instead of mdelay() drivers/net/phy/micrel.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index 08e3915001c3..9952a073413f 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -1475,6 +1475,7 @@ static int ksz9031_get_features(struct phy_device *phydev) static int ksz9031_read_status(struct phy_device *phydev) { + u8 timeout = 10; int err; int regval; @@ -1494,6 +1495,22 @@ static int ksz9031_read_status(struct phy_device *phydev) return genphy_config_aneg(phydev); } + /* KSZ9031's autonegotiation takes normally 4-5 seconds to complete. + * Occasionally it fails to complete autonegotiation. The workaround is + * to restart it. + */ + if (phydev->autoneg == AUTONEG_ENABLE) { + while (timeout) { + if (phy_aneg_done(phydev)) + break; + msleep(1000); + timeout--; + }; + + if (timeout == 0) + phy_restart_aneg(phydev); + } + return 0; }