e1000e: Disable runtime PM on CNP+
authorKai-Heng Feng <kai.heng.feng@canonical.com>
Sat, 2 Feb 2019 17:40:16 +0000 (01:40 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 31 May 2019 13:45:18 +0000 (06:45 -0700)
commit387c278ed19b33d3f160db12685c852c93be3cbe
treede21ffaffc5b456c2ce374f141171a5b44e9d47e
parent88f8c50221522688b2a0e341c3501ebe18ad7c5e
e1000e: Disable runtime PM on CNP+

[ Upstream commit 459d69c407f9ba122f12216555c3012284dc9fd7 ]

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@canonical.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/net/ethernet/intel/e1000e/netdev.c