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

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Message-ID: <20230720142034.GA48270@thinkpad>
Date:   Thu, 20 Jul 2023 19:50:34 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Frank Li <Frank.li@....com>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        helgaas@...nel.org, imx@...ts.linux.dev, bhelgaas@...gle.com,
        devicetree@...r.kernel.org, gustavo.pimentel@...opsys.com,
        kw@...ux.com, leoyang.li@....com,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        lorenzo.pieralisi@....com, minghuan.lian@....com,
        mingkai.hu@....com, robh+dt@...nel.org, roy.zang@....com,
        shawnguo@...nel.org, zhiqiang.hou@....com
Subject: Re: [PATCH v3 1/2] PCI: dwc: Implement general suspend/resume
 functionality for L2/L3 transitions

On Wed, Jul 19, 2023 at 03:16:48PM -0400, Frank Li wrote:
> On Tue, Jul 18, 2023 at 03:34:00PM +0530, Manivannan Sadhasivam wrote:
> > On Mon, Jul 17, 2023 at 02:36:19PM -0400, Frank Li wrote:
> > 
> > Fine then. But can we check for PM_LINKST_IN_L2 SII System Information Interface
> > (SII) instead of LTSSM state?
> >
> where define PM_LINKST_IN_L2? I just find one at
> 
> drivers/pci/controller/dwc/pcie-qcom.c:#define PARF_DEBUG_CNT_PM_LINKST_IN_L2           0xc04
> 

Yes, this register is not exposed by the DWC core itself but the vendors may
expose such as Qcom as you pointed out. If it is not available on all platforms,
then feel free to ignore my advice.

- Mani

> Frank
>  

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