Workaround: PCI: Disable L1ss through quirk for Qualcomm SA8775P

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 <krishna.chundru@oss.qualcomm.com>

Author: krishnachaitanya-linux

drivers/pci/quirks.c

@@ -2527,6 +2527,12 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, 0x0451, quirk_disable_aspm_l0s
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_PASEMI, 0xa002, quirk_disable_aspm_l0s_l1);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0x1105, quirk_disable_aspm_l0s_l1);
 
+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);
+
 /*
  * Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain
  * Link bit cleared after starting the link retrain process to allow this