netdev - RE: [Intel-wired-lan] [PATCH] e1000e: Disable runtime PM on CNP+

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Date:   Fri, 15 Feb 2019 20:37:35 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH] e1000e: Disable runtime PM on CNP+

> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...osl.org] On
> Behalf Of Kai-Heng Feng
> Sent: Saturday, February 2, 2019 9:40 AM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>
> Cc: netdev@...r.kernel.org; Kai-Heng Feng
> <kai.heng.feng@...onical.com>; intel-wired-lan@...ts.osuosl.org; linux-
> kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH] e1000e: Disable runtime PM on CNP+
> 
> There are some new e1000e devices can only be woken up from D3 one
> time,
> by plugging ethernet cable. Subsequent cable plugging does set PME bit
> correctly, but it still doesn't get woken up.
> 
> Since e1000e connects to the root complex directly, we rely on ACPI to
> wake it up. In this case, the GPE from _PRW only works once and stops
> working after that. Though it appears to be a platform bug, e1000e
> maintainers confirmed that I219 does not support D3.
> 
> So disable runtime PM on CNP+ chips. We may need to disable earlier
> generations if this bug also hit older platforms.
> 
> Bugzilla: https://bugzilla.kernel.org/attachment.cgi?id=280819
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Tested-by: Aaron Brown <aaron.f.brown@...el.com>