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Box" , Kai-Heng Feng , "Rafael J. Wysocki" , Heiner Kallweit , Chia-Lin Kao , "linux-tegra@vger.kernel.org" , Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg , linux-nvme@lists.infradead.org References: <7306256a-b380-489b-8248-b774e6d3d80e@nvidia.com> <20260122152903.GA1247682@bhelgaas> <5z7c25nkb35prvax6vq6ud7eaeuhzsswbf7fqvmlgys3xftgwb@odocboejrdrv> From: Jon Hunter Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: LO2P265CA0318.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a4::18) To DS2PR12MB9750.namprd12.prod.outlook.com (2603:10b6:8:2b0::12) Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PR12MB9750:EE_|MW4PR12MB7439:EE_ X-MS-Office365-Filtering-Correlation-Id: 787ac05c-dd82-4aad-56bc-08de6d6433fd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|10070799003|1800799024|376014|366016|7416014; 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Check if the device state is D3Hot. If it is not D3Hot, then the device is > expected to stay in the current D-state by the client driver, so D3Cold should > not be initiated. > > 2. Check if the device is wakeup capable. If it is, then check if it can support > wakeup from D3Cold (with WAKE#). > > Only if both conditions are satisfied for all the devices under the Root busses, > then the host controller driver should initiate D3Cold sequence. > > Krishna is going to post a patch that performs the above checks for > pcie-designware-host driver. But since the above checks are platform agnostic, > we should introduce a helper and resuse it across other controllers as well. Do you have a rough idea of when you will be posting patches for this? Thanks Jon -- nvpublic