linux-kernel - Re: [PATCH] e1000e: bump up timeout to wait when ME un-configure ULP mode

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Date:   Wed, 25 Mar 2020 15:58:16 +0200
From:   "Neftin, Sasha" <sasha.neftin@...el.com>
To:     Aaron Ma <aaron.ma@...onical.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        David Miller <davem@...emloft.net>,
        "moderated list:INTEL ETHERNET DRIVERS" 
        <intel-wired-lan@...ts.osuosl.org>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "Lifshits, Vitaly" <vitaly.lifshits@...el.com>, rex.tsai@...el.com
Subject: Re: [PATCH] e1000e: bump up timeout to wait when ME un-configure ULP
 mode

On 3/25/2020 08:43, Aaron Ma wrote:
> 
> 
> On 3/25/20 2:36 PM, Neftin, Sasha wrote:
>> On 3/25/2020 06:17, Kai-Heng Feng wrote:
>>> Hi Aaron,
>>>
>>>> On Mar 24, 2020, at 03:16, Aaron Ma <aaron.ma@...onical.com> wrote:
>>>>
>>>> ME takes 2+ seconds to un-configure ULP mode done after resume
>>>> from s2idle on some ThinkPad laptops.
>>>> Without enough wait, reset and re-init will fail with error.
>>>
>>> Thanks, this patch solves the issue. We can drop the DMI quirk in
>>> favor of this patch.
>>>
>>>>
>>>> Fixes: f15bb6dde738cc8fa0 ("e1000e: Add support for S0ix")
>>>> BugLink: https://bugs.launchpad.net/bugs/1865570
>>>> Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
>>>> ---
>>>> drivers/net/ethernet/intel/e1000e/ich8lan.c | 4 ++--
>>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c
>>>> b/drivers/net/ethernet/intel/e1000e/ich8lan.c
>>>> index b4135c50e905..147b15a2f8b3 100644
>>>> --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
>>>> +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
>>>> @@ -1240,9 +1240,9 @@ static s32 e1000_disable_ulp_lpt_lp(struct
>>>> e1000_hw *hw, bool force)
>>>>              ew32(H2ME, mac_reg);
>>>>          }
>>>>
>>>> -        /* Poll up to 300msec for ME to clear ULP_CFG_DONE. */
>>>> +        /* Poll up to 2.5sec for ME to clear ULP_CFG_DONE. */
>>>>          while (er32(FWSM) & E1000_FWSM_ULP_CFG_DONE) {
>>>> -            if (i++ == 30) {
>>>> +            if (i++ == 250) {
>>>>                  ret_val = -E1000_ERR_PHY;
>>>>                  goto out;
>>>>              }
>>>
>>> The return value was not caught by the caller, so the error ends up
>>> unnoticed.
>>> Maybe let the caller check the return value of
>>> e1000_disable_ulp_lpt_lp()?
>>>
>>> Kai-Heng
>> Hello Kai-Heng and Aaron,
>> I a bit confused. In our previous conversation you told ME not running.
>> let me shimming in. Increasing delay won't be solve the problem and just
>> mask it. We need to understand why ME take too much time. What is
>> problem with this specific system?
>> So, basically no ME system should works for you.
> 
> Some laptops ME work that's why only reproduce issue on some laptops.
> In this issue i219 is controlled by ME.
> 
Who can explain - why ME required too much time on this system?
Probably need work with ME/BIOS vendor and understand it.
Delay will just mask the real problem - we need to find root cause.
> Quirk is only for 1 model type. But issue is reproduced by more models.
> So it won't work.
> 
> Regard,
> Aaron
> 
>>
>> Meanwhile I prefer keep DMI quirk.
>> Thanks,
>> Sasha
>>>
>>>> -- 
>>>> 2.17.1
>>>>
>>>
>>