From a44c29aca69462ba4aa9f0b9c59a40ccb2ab874a Mon Sep 17 00:00:00 2001 From: Kai-Heng Feng Date: Thu, 30 May 2024 16:52:27 +0800 Subject: [PATCH 2/2] PCI: vmd: Let OS control ASPM for devices under VMD domain 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/ Signed-off-by: Kai-Heng Feng --- 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); -- 2.43.0