[PATCH 1/1] net: wwan: iosm: Keep device at D0 for s2idle case

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1956443

We are seeing spurious wakeup caused by Intel 7560 WWAN on AMD laptops.
This prevent those laptops to stay in s2idle state.

>From what I can understand, the intention of ipc_pcie_suspend() is to
put the device to D3cold, and ipc_pcie_suspend_s2idle() is to keep the
device at D0. However, the device can still be put to D3hot/D3cold by
PCI core.

So explicitly let PCI core know this device should stay at D0, to solve
the spurious wakeup.

Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit f4dd5174e2739ab0aeda14b32847e587e78ff3d9 linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/net/wwan/iosm/iosm_ipc_pcie.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wwan/iosm/iosm_ipc_pcie.c b/drivers/net/wwan/iosm/iosm_ipc_pcie.c
index 7f7d364d3a514..66b886e3b59b0 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_pcie.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_pcie.c
@@ -340,6 +340,9 @@ static int __maybe_unused ipc_pcie_suspend_s2idle(struct iosm_pcie *ipc_pcie)
 
 	ipc_imem_pm_s2idle_sleep(ipc_pcie->imem, true);
 
+	/* Let PCI core know this device should stay at D0 */
+	pci_save_state(ipc_pcie->pci);
+
 	return 0;
 }
 
-- 
2.33.1