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UBUNTU: SAUCE: PCI: vmd: Let OS control ASPM for devices under VMD domain

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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: f492edb40b ("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@canonical.com>
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Acked-by: Aaron Jauregui <aaron.jauregui@canonical.com>
Acked-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Kai-Heng Feng
2024-08-19 10:59:08 +08:00
committed by Stefan Bader
parent 4cfe58fcb2
commit 6e5c8108af
1 changed files with 2 additions and 0 deletions
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drivers/pci/controller/vmd.c
+2
View File
@@ -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);