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Lian" , Mingkai Hu , "robh+dt@kernel.org" , Roy Zang , "shawnguo@kernel.org" , "Z.Q. Hou" Subject: Re: [PATCH v3 1/2] PCI: dwc: Implement general suspend/resume functionality for L2/L3 transitions Message-ID: References: <20230419164118.596300-1-Frank.Li@nxp.com> Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SJ0PR05CA0002.namprd05.prod.outlook.com (2603:10b6:a03:33b::7) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|AS8PR04MB8852:EE_ X-MS-Office365-Filtering-Correlation-Id: 6354262f-2654-4516-941c-08db6b606797 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM6PR04MB4838.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(4636009)(7916004)(346002)(39860400002)(376002)(136003)(366004)(396003)(451199021)(5660300002)(54906003)(7416002)(8676002)(6916009)(4326008)(66946007)(66556008)(8936002)(41300700001)(316002)(4744005)(186003)(2906002)(478600001)(66476007)(6666004)(6486002)(52116002)(9686003)(6512007)(6506007)(33716001)(26005)(86362001)(38100700002)(38350700002);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, May 12, 2023 at 02:47:46PM +0000, Frank Li wrote: > > > > Introduced helper function dw_pcie_get_ltssm to retrieve > > SMLH_LTSS_STATE. > > Added API pme_turn_off and exit_from_l2 for managing L2/L3 state > > transitions. > > > > Typical L2 entry workflow: > > > > 1. Transmit PME turn off signal to PCI devices. > > 2. Await link entering L2_IDLE state. > > 3. Transition Root complex to D3 state. > > > > Typical L2 exit workflow: > > > > 1. Transition Root complex to D0 state. > > 2. Issue exit from L2 command. > > 3. Reinitialize PCI host. > > 4. Wait for link to become active. > > > > Signed-off-by: Frank Li > > --- > > Ping Ping > > > Change from v2 to v3: > > - Basic rewrite whole patch according rob herry suggestion. > > put common function into dwc, so more soc can share the same logic. > > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel