WORKAROUND: PCI: Disable L1ss through quirk for HMT & Cologne

krishnachaitanya-linux · krishnachaitanya-linux · commit 0cc14a562173 · 2026-02-13T07:40:31.000+05:30
When PCIe L1ss is enabled, WLAN functionality is completly broken.
There are some connectivity issues in this platform mostly with
CLKREQ# pin.

Disable L1ss as workaround untill actual issue get resolved.

Signed-off-by: Krishna Chaitanya Chundru &lt;krishna.chundru@oss.qualcomm.com&gt;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
@@ -2532,6 +2532,8 @@ static void quirk_disable_aspm_l1ss(struct pci_dev *dev)
 	pci_disable_link_state(dev, PCIE_LINK_STATE_L1_1 | PCIE_LINK_STATE_L1_2);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QCOM, 0x1103, quirk_disable_aspm_l1ss);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QCOM, 0x1107, quirk_disable_aspm_l1ss);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QCOM, 0x1112, quirk_disable_aspm_l1ss);
 
 /*
  * Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain

Original file line number	Diff line number	Diff line change
`@@ -2532,6 +2532,8 @@ static void quirk_disable_aspm_l1ss(struct pci_dev *dev)`
`2532`	`2532`	`pci_disable_link_state(dev, PCIE_LINK_STATE_L1_1 \| PCIE_LINK_STATE_L1_2);`
`2533`	`2533`	`}`
`2534`	`2534`	`DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QCOM, 0x1103, quirk_disable_aspm_l1ss);`
	`2535`	`+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QCOM, 0x1107, quirk_disable_aspm_l1ss);`
	`2536`	`+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_QCOM, 0x1112, quirk_disable_aspm_l1ss);`
`2535`	`2537`
`2536`	`2538`	`/*`
`2537`	`2539`	`* Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain`