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[2/2] PCI: vmd: Let OS control ASPM for devices under VMD domain

Message ID 20240530085227.91168-2-kai.heng.feng@canonical.com (mailing list archive)
State New
Delegated to: Bjorn Helgaas
Headers show
Series [1/2] PCI: ASPM: Allow OS to configure ASPM where BIOS is incapable of | expand

Commit Message

Kai-Heng Feng May 30, 2024, 8:52 a.m. UTC
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 <kai.heng.feng@canonical.com>
---
 drivers/pci/controller/vmd.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 87b7856f375a..1dbc525c473f 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);