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Date:   Tue, 15 Dec 2020 15:23:01 +0200
From:   "Neftin, Sasha" <sasha.neftin@...el.com>
To:     Mark Pearson <markpearson@...ovo.com>,
        Mario Limonciello <mario.limonciello@...l.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        David Miller <davem@...emloft.net>,
        Aaron Ma <aaron.ma@...onical.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Aaron Brown <aaron.f.brown@...el.com>,
        Stefan Assmann <sassmann@...hat.com>,
        "darcari@...hat.com" <darcari@...hat.com>,
        "Yijun.Shen@...l.com" <Yijun.Shen@...l.com>,
        "Perry.Yuan@...l.com" <Perry.Yuan@...l.com>,
        "anthony.wong@...onical.com" <anthony.wong@...onical.com>,
        "Ruinskiy, Dima" <dima.ruinskiy@...el.com>,
        "Efrati, Nir" <nir.efrati@...el.com>,
        "Lifshits, Vitaly" <vitaly.lifshits@...el.com>,
        "Neftin, Sasha" <sasha.neftin@...el.com>
Subject: Re: Fw: [External] Re: [PATCH v4 0/4] Improve s0ix flows for systems
 i219LM

On 12/14/2020 20:40, Mark Pearson wrote:
> Thanks Hans
> 
> On 14/12/2020 13:31, Mark Pearson wrote:
>>
>>
>> ------------------------------------------------------------------------
>> *From:* Hans de Goede <hdegoede@...hat.com>
>> *Sent:* December 14, 2020 13:24
>> *To:* Mario Limonciello <mario.limonciello@...l.com>; Jeff Kirsher
>> <jeffrey.t.kirsher@...el.com>; Tony Nguyen <anthony.l.nguyen@...el.com>;
>> intel-wired-lan@...ts.osuosl.org <intel-wired-lan@...ts.osuosl.org>;
>> David Miller <davem@...emloft.net>; Aaron Ma <aaron.ma@...onical.com>;
>> Mark Pearson <mpearson@...ovo.com>
>> *Cc:* linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>;
>> Netdev <netdev@...r.kernel.org>; Alexander Duyck
>> <alexander.duyck@...il.com>; Jakub Kicinski <kuba@...nel.org>; Sasha
>> Netfin <sasha.neftin@...el.com>; Aaron Brown <aaron.f.brown@...el.com>;
>> Stefan Assmann <sassmann@...hat.com>; darcari@...hat.com
>> <darcari@...hat.com>; Yijun.Shen@...l.com <Yijun.Shen@...l.com>;
>> Perry.Yuan@...l.com <Perry.Yuan@...l.com>; anthony.wong@...onical.com
>> <anthony.wong@...onical.com>
>> *Subject:* [External] Re: [PATCH v4 0/4] Improve s0ix flows for systems
>> i219LM
>>   
>> Hi All,
>>
> <snip>
>>
>> ###
>>
>> I've added Mark Pearson from Lenovo to the Cc so that Lenovo
>> can investigate this issue further.
>>
>> Mark, this thread is about an issue with enabling S0ix support for
>> e1000e (i219lm) controllers. This was enabled in the kernel a
>> while ago, but then got disabled again on vPro / AMT enabled
>> systems because on some systems (Lenovo X1C7 and now also X1C8)
>> this lead to suspend/resume issues.
>>
>> When AMT is active then there is a handover handshake for the
>> OS to get access to the ethernet controller from the ME. The
>> Intel folks have checked and the Windows driver is using a timeout
>> of 1 second for this handshake, yet on Lenovo systems this is
>> taking 2 seconds. This likely has something to do with the
>> ME firmware on these Lenovo models, can you get the firmware
>> team at Lenovo to investigate this further ?
> Absolutely - I'll ask them to look into this again.
> 
we need to explain why on Windows systems required 1s and on Linux 
systems up to 2.5s - otherwise it is not reliable approach - you will 
encounter others buggy system.
(ME not POR on the Linux systems - is only one possible answer)
> We did try to make progress with this previously - but it got a bit
> stuck and hence the need for these patches....but I believe things may
> have changed a bit so it's worth trying again
> 
> Mark
> 
Sasha

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