Reference in a new issue

Blame

Copy permalink

Reference in a new issue

Copy permalink

Mario Limonciello ffe8a0c6b5 pinctrl-amd: Don't clear S4 wake bits at probe ...

commit 6bc3462a0f ("pinctrl: amd: Mask wake bits on probe again")
introduced a regression where Wake-on-LAN no longer works after suspend
or shutdown on some AMD platforms.

Firmware-programmed S4 wake bits for devices like PCIe NICs using PCI
PME are cleared at probe, but nothing restores them. Unlike S0i3/S3 wake
sources that use enable_irq_wake() -> amd_gpio_irq_set_wake(), PCIe PME
does not use GPIO IRQ infrastructure and relies on firmware configuration.

The original intent of commit 6bc3462a0f ("pinctrl: amd: Mask wake
bits on probe again") was to clear spurious wake bits left by firmware
to prevent unwanted wakeups. However, S4 wake bits are used for
hardware-level wake sources like WoL that bypass the kernel's IRQ wake
API.

Fix by preserving S4 wake bits at probe and only clearing S0i3/S3 bits:
- Firmware-configured S4 wake sources (WoL) continue working
- Kernel maintains control of S3/S0i3 wake policy via set_wake()
- S3-only wake sources work correctly per commit f31f33dbb3 ("pinctrl:
  amd: Take suspend type into consideration which pins are non-wake")

The trade-off is that firmware-programmed spurious S4 wake bits remain
set, but this is less problematic than breaking WoL.

Fixes: 6bc3462a0f ("pinctrl: amd: Mask wake bits on probe again")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

2026-07-25 11:32:03 +02:00

1297 lines

34 KiB

Raw Permalink Blame History