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Tue, 20 Oct 2026 06:56:00 +0000 Message-ID: <1562f299-bb3e-4fe6-81d9-e11f67606737@intel.com> Date: Tue, 20 Oct 2026 09:55:54 +0300 User-Agent: Mozilla Thunderbird Subject: Re: igc: I226-V does not wake from S5, PHPM D3 link-disable bits never cleared To: Michael Serajnik , CC: Tony Nguyen , Przemek Kitszel , References: <179223208565.28107.1987245697366860479@mser.at> Content-Language: en-US From: "Ruinskiy, Dima" In-Reply-To: <179223208565.28107.1987245697366860479@mser.at> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: TL2P290CA0024.ISRP290.PROD.OUTLOOK.COM (2603:1096:950:3::8) To SJ0PR11MB5630.namprd11.prod.outlook.com (2603:10b6:a03:3bb::6) X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ0PR11MB5630:EE_|SA2PR11MB5018:EE_ X-MS-Office365-Filtering-Correlation-Id: 9e6b26d0-afca-42a8-8ca0-08df2e7732c6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|23010399003|366016|1800799024|22082099003|18002099003|11063799006|5023799004|10067099003|56012099006; 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[1] > > With all three speeds disabled in D3, the PHY has no link while the > device is in D3, so the magic packet never reaches the MAC, however > WUFC is programmed. In mainline igc, `__igc_shutdown()` sets WUC, > WUFC and CTRL.ADVD3WUC and calls `igc_power_up_link()`, but nothing > in the driver clears these PHPM bits, and igc defines neither the > bits nor a D3 LPLU operation. Hi Michael, With these bits cleared, the link should resolve to the lowest, 10Mbps speed. In recent years, an increasing number of switches stopped supporting 10Mbps, so we have been receiving reports of similar problems from time to time. I think I can fix it in the driver, but to double-check that the problem is indeed this, and not something else in the wake-from-shutdown path, could you try to reproduce with a different link partner (switch or back-to-back) that is known to support 10Mbps link speed? Thanks! --Dima