linux-kernel - Re: [Intel-wired-lan] [PATCH] e1000e: Power cycle phy on PM resume

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Date:   Wed, 23 Sep 2020 15:28:01 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH] e1000e: Power cycle phy on PM resume

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?

> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.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?


Kind regards,

Paul