netdev - Re: [PATCH net-next] e1000e: Use PME poll to circumvent unreliable ACPI wake

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Message-ID: <ZK6Fuu/26apf1DGq@corigine.com>
Date: Wed, 12 Jul 2023 11:51:38 +0100
From: Simon Horman <simon.horman@...igine.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
	edumazet@...gle.com, netdev@...r.kernel.org,
	Kai-Heng Feng <kai.heng.feng@...onical.com>, sasha.neftin@...el.com,
	Naama Meir <naamax.meir@...ux.intel.com>
Subject: Re: [PATCH net-next] e1000e: Use PME poll to circumvent unreliable
 ACPI wake

On Mon, Jul 10, 2023 at 09:42:13AM -0700, Tony Nguyen wrote:
> From: Kai-Heng Feng <kai.heng.feng@...onical.com>
> 
> On some I219 devices, ethernet cable plugging detection only works once
> from PCI D3 state. Subsequent cable plugging does set PME bit correctly,
> but device still doesn't get woken up.
> 
> Since I219 connects to the root complex directly, it relies on platform
> firmware (ACPI) to wake it up. In this case, the GPE from _PRW only
> works for first cable plugging but fails to notify the driver for
> subsequent plugging events.
> 
> The issue was originally found on CNP, but the same issue can be found
> on ADL too. So workaround the issue by continuing use PME poll after
> first ACPI wake. As PME poll is always used, the runtime suspend
> restriction for CNP can also be removed.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> Tested-by: Naama Meir <naamax.meir@...ux.intel.com>
> Acked-by: Sasha Neftin <sasha.neftin@...el.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>