[SRU][N/O/unstable][PATCH 2/2] UBUNTU: SAUCE: PCI: vmd: Let OS control ASPM for devices under VMD domain

[Hui Wang]

From: Kai-Heng Feng <kai.heng.feng at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/2072679

Intel SoC cannot reach lower power states when mapped VMD PCIe bridges
and NVMe devices don't have ASPM configured.

So set aspm_os_control attribute to let OS really enable ASPM for those
devices.

Fixes: f492edb40b54 ("PCI: vmd: Add quirk to configure PCIe ASPM and LTR")
Link: https://lore.kernel.org/linux-pm/218aa81f-9c6-5929-578d-8dc15f83dd48@panix.com/
(cherry picked from https://lore.kernel.org/linux-pci/20240530085227.91168-2-kai.heng.feng@canonical.com/)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
Signed-off-by: Hui Wang <hui.wang at canonical.com>
---
 drivers/pci/controller/vmd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index c9c200adefd2..e33d213a34fb 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -751,6 +751,8 @@ static int vmd_pm_enable_quirk(struct pci_dev *pdev, void *userdata)
 	if (!(features & VMD_FEAT_BIOS_PM_QUIRK))
 		return 0;
 
+	pdev->aspm_os_control = 1;
+
 	pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL);
 
 	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_LTR);
-- 
2.34.1