linux-kernel - RE: [Intel-wired-lan] [v4][PATCH] e1000e: continue to init phy even when failed to disable ULP

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Date:   Tue, 28 Jul 2020 20:34:41 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     Aaron Ma <aaron.ma@...onical.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Lifshits, Vitaly" <vitaly.lifshits@...el.com>,
        "kai.heng.feng@...onical.com" <kai.heng.feng@...onical.com>,
        "Neftin, Sasha" <sasha.neftin@...el.com>
Subject: RE: [Intel-wired-lan] [v4][PATCH] e1000e: continue to init phy even
 when failed to disable ULP

> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Aaron Ma
> Sent: Wednesday, June 17, 2020 11:55 PM
> To: kuba@...nel.org; Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>;
> davem@...emloft.net; intel-wired-lan@...ts.osuosl.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Lifshits, Vitaly
> <vitaly.lifshits@...el.com>; kai.heng.feng@...onical.com; Neftin, Sasha
> <sasha.neftin@...el.com>
> Subject: [Intel-wired-lan] [v4][PATCH] e1000e: continue to init phy even when
> failed to disable ULP
> 
> After 'commit e086ba2fccda4 ("e1000e: disable s0ix entry and exit flows
>  for ME systems")',
> ThinkPad P14s always failed to disable ULP by ME.
> 'commit 0c80cdbf3320 ("e1000e: Warn if disabling ULP failed")'
> break out of init phy:
> 
> error log:
> [   42.364753] e1000e 0000:00:1f.6 enp0s31f6: Failed to disable ULP
> [   42.524626] e1000e 0000:00:1f.6 enp0s31f6: PHY Wakeup cause - Unicast
> Packet
> [   42.822476] e1000e 0000:00:1f.6 enp0s31f6: Hardware Error
> 
> When disable s0ix, E1000_FWSM_ULP_CFG_DONE will never be 1.
> If continue to init phy like before, it can work as before.
> iperf test result good too.
> 
> Fixes: 0c80cdbf3320 ("e1000e: Warn if disabling ULP failed")
> Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
> ---
>  drivers/net/ethernet/intel/e1000e/ich8lan.c | 1 -
>  1 file changed, 1 deletion(-)

I never did find a system that triggered the initial problem, but from a compatibility with the set of systems I do have working...
Tested-by: Aaron Brown <aaron.f.brown@...el.com>