linux-kernel - Re: [PATCH V1] PCI/ASPM: Save/restore L1SS Capability for suspend/resume

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Date:   Tue, 15 Feb 2022 22:00:31 -0800 (PST)
From:   "Kenneth R. Crudup" <kenny@...ix.com>
To:     Vidya Sagar <vidyas@...dia.com>
cc:     Bjorn Helgaas <helgaas@...nel.org>, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, hkallweit1@...il.com,
        wangxiongfeng2@...wei.com, mika.westerberg@...ux.intel.com,
        kai.heng.feng@...onical.com, chris.packham@...iedtelesis.co.nz,
        yangyicong@...ilicon.com, treding@...dia.com, jonathanh@...dia.com,
        abhsahu@...dia.com, sagupta@...dia.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kthota@...dia.com,
        mmaddireddy@...dia.com, sagar.tv@...il.com,
        "Kenneth R. Crudup" <kenny@...ix.com>
Subject: Re: [PATCH V1] PCI/ASPM: Save/restore L1SS Capability for
 suspend/resume


On Wed, 16 Feb 2022, Vidya Sagar wrote:

> I see that the ASPM-L1 state of Realtek NIC which was in disabled state before
> hibernate got enabled after hibernate.

That's actually my SD-Card reader; there's a good chance the BIOS does "something"
to it at boot time, as it's possible to boot from SD-Card on my laptop.

> This patch doesn't do anything to LnkCtl register which has control for ASPM L1
> state.

> Could you please check why ASPM L1 got enabled post hibernation?

I wouldn't know how to do that; if you're still interested in that let me know
what to do to determine that.

	-Kenny

-- 
Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange County CA