linux-kernel - Re: [PATCH v3 1/2] PCI: dwc: Implement general suspend/resume functionality for L2/L3 transitions

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Message-ID: <ZLVKqsO1PSKRC70o@lizhi-Precision-Tower-5810>
Date:   Mon, 17 Jul 2023 10:05:30 -0400
From:   Frank Li <Frank.li@....com>
To:     "helgaas@...nel.org" <helgaas@...nel.org>
Cc:     "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>,
        "kw@...ux.com" <kw@...ux.com>, Leo Li <leoyang.li@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "M.H. Lian" <minghuan.lian@....com>,
        Mingkai Hu <mingkai.hu@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Roy Zang <roy.zang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "Z.Q. Hou" <zhiqiang.hou@....com>
Subject: Re: [PATCH v3 1/2] PCI: dwc: Implement general suspend/resume
 functionality for L2/L3 transitions

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@....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.
> > > 
> >