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SubjectRe: [Intel-wired-lan] [PATCH] e1000e: Power cycle phy on PM resume
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Hi Paul,

> On Sep 23, 2020, at 21:28, Paul Menzel <pmenzel@molgen.mpg.de> wrote:
>
> Dear Kai-Heng,
>
>
> Am 23.09.20 um 09:47 schrieb Kai-Heng Feng:
>> We are seeing the following error after S3 resume:
>> [ 704.746874] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
>> [ 704.844232] e1000e 0000:00:1f.6 eno1: MDI Write did not complete
>> [ 704.902817] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
>> [ 704.903075] e1000e 0000:00:1f.6 eno1: reading PHY page 769 (or 0x6020 shifted) reg 0x17
>> [ 704.903281] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
>> [ 704.903486] e1000e 0000:00:1f.6 eno1: writing PHY page 769 (or 0x6020 shifted) reg 0x17
>> [ 704.943155] e1000e 0000:00:1f.6 eno1: MDI Error
>> ...
>> [ 705.108161] e1000e 0000:00:1f.6 eno1: Hardware Error
>> Since we don't know what platform firmware may do to the phy, so let's
>> power cycle the phy upon system resume to resolve the issue.
>
> Is there a bug report or list thread for this issue?

No. That's why I sent a patch to start discussion :)

>
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> ---
>> drivers/net/ethernet/intel/e1000e/netdev.c | 2 ++
>> 1 file changed, 2 insertions(+)
>> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
>> index 664e8ccc88d2..c2a87a408102 100644
>> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
>> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
>> @@ -6968,6 +6968,8 @@ static __maybe_unused int e1000e_pm_resume(struct device *dev)
>> !e1000e_check_me(hw->adapter->pdev->device))
>> e1000e_s0ix_exit_flow(adapter);
>> + e1000_power_down_phy(adapter);
>> +
>> rc = __e1000_resume(pdev);
>> if (rc)
>> return rc;
>
> How much does this increase the resume time?

I didn't measure it. Because for me it's more important to have a working device.

Does it have a noticeable impact on your system's resume time?

Kai-Heng

>
>
> Kind regards,
>
> Paul
>

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