Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 17 Jul 2023 10:05:30 -0400
From:   Frank Li <Frank.li@nxp.com>
To:     "helgaas@kernel.org" <helgaas@kernel.org>
Cc:     "imx@lists.linux.dev" <imx@lists.linux.dev>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "gustavo.pimentel@synopsys.com" <gustavo.pimentel@synopsys.com>,
        "kw@linux.com" <kw@linux.com>, Leo Li <leoyang.li@nxp.com>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        dl-linux-imx <linux-imx@nxp.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
        "M.H. Lian" <minghuan.lian@nxp.com>,
        Mingkai Hu <mingkai.hu@nxp.com>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        Roy Zang <roy.zang@nxp.com>,
        "shawnguo@kernel.org" <shawnguo@kernel.org>,
        "Z.Q. Hou" <zhiqiang.hou@nxp.com>
Subject: Re: [PATCH v3 1/2] PCI: dwc: Implement general suspend/resume
 functionality for L2/L3 transitions
Message-ID: <ZLVKqsO1PSKRC70o@lizhi-Precision-Tower-5810>
References: <20230419164118.596300-1-Frank.Li@nxp.com>
 <AM6PR04MB48383AB3FD2062334ECB66EB88759@AM6PR04MB4838.eurprd04.prod.outlook.com>
 <ZIdE2KjOuyHmLqz0@lizhi-Precision-Tower-5810>
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <ZIdE2KjOuyHmLqz0@lizhi-Precision-Tower-5810>
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?HEXpbDxBGhiwtIPJOmifVvQIiER7sQWvJP8kZ0ivnAfkzCvlr4gwpsAJ9pHo?=
 =?us-ascii?Q?vNkl4CzyclvHuVBESr4r1qI1yAPJFC9ZG3Kl+oh7ejnSoq+qPrBnZb/xZMZ7?=
 =?us-ascii?Q?oShOZc8waU5jveNnC7fuZ9pAYr+4ldZwPgIMt2fVpk65GTVWfyoFYrpNyVW7?=
 =?us-ascii?Q?AZJIbkffWH7FNeoR+cBAX5NdvV4ZuzRrRZlkZJCrkCHUuXr33EUe9j6eXHsw?=
 =?us-ascii?Q?sZypTJg+U8+EdagW8OeVenjgj6bvQdebi21QKtO5x5NXdQZ+9nX5fpMiBg3p?=
 =?us-ascii?Q?4TG9mb+TsC6KQ6wPchiEdTkxaYXptG1dYDIiGIi4d7tzQVbibV5jOaM6XjEL?=
 =?us-ascii?Q?xpwQyftmHvmjZgOtIsPs4I+frmGI5Izxbx2b8Un1c0cmtRE7cjui8CgJgidC?=
 =?us-ascii?Q?AbYzeeBLj3lyGvRuflxYBFdI+rU5LGj3ytsv0MAtLn5fG2dQRMU3vqjkgqqn?=
 =?us-ascii?Q?EPcrkjF6agnpoiUQ2fK5FIVlP2Fu8oumsNfBjRsuNd2WIOG6GcF2rHiDQdKp?=
 =?us-ascii?Q?h4Ij3Wsgd5N76rUwx1yy+rzc6tuy5QDcraSnEiudM7zZEgZQjkvGXhb18VpP?=
 =?us-ascii?Q?5OmgmMW3sKI/xwoYaIwpJqa2MnSk1HDyZUcr4IMCwE38g4WabnfB/XPqFSJP?=
 =?us-ascii?Q?Ttzhu1w3r+MDioaEx+Cd3x4ZlbDD5x9BQJFqdXuvd7cDBkSGzspmES75tPsd?=
 =?us-ascii?Q?184iPTkEmoft4A8BZ0kLgsy7eGtkmt/ejmnCfp5ZEDWAmtFecNDJNO4am74C?=
 =?us-ascii?Q?QOpT6OBgFIXFSCbb7gbwmauxX7VQZrXjfs5KU9a2zVj7U5Cz3ciVECX8+v63?=
 =?us-ascii?Q?tYb8JVJP6Y+N9BvloA8WxF+JImSxRkBejzmFpJuc13P6anth+yT9BgtnOt2p?=
 =?us-ascii?Q?/WEGWpxetuNoHCdCegpEaaZbhRHrw3iadWw4xokpKQ/blyC9fq+YwZVwTnxq?=
 =?us-ascii?Q?VQt9Et+j7KxOPrE2qaMV36aODweBN6aPoFkffbgXDBPqGAsEcEBNplaNDkFu?=
 =?us-ascii?Q?StITVmebDnqNttNP9NbuetCD/+v5Av/OMSO+3P03V1/eePsQ1uIXQ/9aIGx7?=
 =?us-ascii?Q?LWSpi7TcgHYps0ZzJASSY61J3rBd93JYX1twe7eyfwg/JCgnrNYcdu8d5u+J?=
 =?us-ascii?Q?EqGafw7KZE0/Pb08j5Tvuw16h4Bc43JsJZhvSU3hggb1XcFlpv5Dfdwyj3zz?=
 =?us-ascii?Q?sJW2R7q8eOyfYBJPn2umGMA1RiMkXHHWXFW5l0kduXTKehunRTaUguQlMbPS?=
 =?us-ascii?Q?xSfPuMg0OSC3nMOdBgIeBT6KWFvZmuaCOlgYvRvzAqTskdEFsXZDPXX96vo8?=
 =?us-ascii?Q?++9nMG4Cuc+tH6xb2v6oJeOFw83PNpNA1y6HIi+f9H6DjUuhtE8L66UHQcHN?=
 =?us-ascii?Q?KXj0KccHwt9e5rtlOSXTeUlqOo6wOoAzvtrvfNJpS/GlEjqt3J7md65eR4UI?=
 =?us-ascii?Q?9owEuTHageApgI0GQbAxILGhT5IuLUrleCDn35zQyuy5FWx02TeHmyKQWSfK?=
 =?us-ascii?Q?n69Zt8W6E19J08t0AshRUAQ0cuOXc+nO0uh7G5NpO6gCSVZkD5rkXIRlqkw6?=
 =?us-ascii?Q?c4hXoOmZMJZcYQ4vEni8SxX+iZ1ueepNRzZlMWDQ?=
X-OriginatorOrg: nxp.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 54b36ca4-2c40-4850-4bbe-08db86cee849
X-MS-Exchange-CrossTenant-AuthSource: AM6PR04MB4838.eurprd04.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jul 2023 14:05:42.4141
 (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: kUhHM3WdS5RLTR1DiNHxKd1axOV/nbireW4yP/wLD9h212pPOK8hAQEyIeneYm/5qvf2bywzEvnFlhKEI0h/aQ==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR04MB7607
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE
        autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, Jun 12, 2023 at 12:16:24PM -0400, Frank Li wrote:
> 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 <Frank.Li@nxp.com>
> > > ---
> > 
> > Ping
> 
> 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.
> > > 
> >