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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 Thread-Topic: [PATCH v3 1/2] PCI: dwc: Implement general suspend/resume functionality for L2/L3 transitions Thread-Index: AQHZct3SW2dT9GmC60WQlV8ZXVruY69W24pA Date: Fri, 12 May 2023 14:47:46 +0000 Message-ID: References: <20230419164118.596300-1-Frank.Li@nxp.com> In-Reply-To: <20230419164118.596300-1-Frank.Li@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: AM6PR04MB4838:EE_|DB9PR04MB8478:EE_ x-ms-office365-filtering-correlation-id: 4a05b657-85fc-419b-9467-08db52f7d992 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)(39860400002)(346002)(396003)(376002)(366004)(136003)(451199021)(54906003)(26005)(55236004)(186003)(6506007)(9686003)(478600001)(38100700002)(7696005)(55016003)(122000001)(71200400001)(4744005)(2906002)(52536014)(8676002)(7416002)(8936002)(5660300002)(38070700005)(44832011)(41300700001)(66946007)(76116006)(33656002)(66556008)(66446008)(66476007)(64756008)(4326008)(86362001)(6916009)(316002);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM6PR04MB4838.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4a05b657-85fc-419b-9467-08db52f7d992 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 May 2023 14:47:46.3140 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 92wcn2ulQ2rvh1tY8KkAkdvqJ3mC38sOsSuibmTl6lXypFHpdE++EJzqOazoYjbIpsuBn7MZLYZzAkZzUSebuQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR04MB8478 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >=20 > 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. >=20 > Typical L2 entry workflow: >=20 > 1. Transmit PME turn off signal to PCI devices. > 2. Await link entering L2_IDLE state. > 3. Transition Root complex to D3 state. >=20 > Typical L2 exit workflow: >=20 > 1. Transition Root complex to D0 state. > 2. Issue exit from L2 command. > 3. Reinitialize PCI host. > 4. Wait for link to become active. >=20 > Signed-off-by: Frank Li > --- 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. >=20