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

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Message-ID: <8aa96f79-402-4897-424f-64a2c6893de8@panix.com>
Date:   Tue, 1 Feb 2022 10:53:12 -0800 (PST)
From:   "Kenneth R. Crudup" <kenny@...ix.com>
To:     Vidya Sagar <vidyas@...dia.com>
cc:     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 Tue, 1 Feb 2022, Vidya Sagar wrote:

> Kenneth R. Crudup <kenny@...ix.com>
> Could you please try this patch on top of linux-next and collect more info?
> - 'sudo lspci -vvvv' output before and after hibernation

See attached. Added a diff file, too.

> - could you please confirm the working of this patch for non NVMe devices that
>   support L1 Sub-States?

It seems to work, I'm on it now. I saw a "GPU Hang" from the i915 driver, but
it doesn't seem to be affecting the GPU any.

> - Could you please try "NVME_QUIRK_NO_DEEPEST_PS" and "NVME_QUIRK_SIMPLE_SUSPEND"
>   quirks (one at a time) in check_vendor_combination_bug() API and see if it
>   makes any difference?

Do you still need me to do that, since this appears to work?

I will try another hibernate attempt just to be sure, too.

	-Kenny

-- 
Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange County CA
View attachment "diff-of-lspci-before-after" of type "text/plain" (1996 bytes)

View attachment "lspci-l1ss-patch-before-hibernate" of type "text/plain" (42582 bytes)

View attachment "lspci-l1ss-patch-after-hibernate" of type "text/plain" (42582 bytes)