MLK-25334-2 PCI: imx: export one property to disable l1ss support or not

Some HW boards might not support the L1.1 ASPM, although the L1.1 ASPM is supported by the SOC chip. So, export one property to disable L1.1 ASPM supported or not. Signed-off-by: Richard Zhu <[email protected]> Reviewed-by: Jun Li <[email protected]> (cherry picked from commit 4e42c418396d545a48a4eb47a04ce73a27b0415e)
zandrey · Mar 12, 2021 · 3edfbde · 3edfbde
1 parent 439d54d
commit 3edfbde
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
@@ -2446,6 +2446,10 @@ static int imx6_pcie_probe(struct platform_device *pdev)
 		imx6_pcie->ext_osc = 0;
 	if (of_property_read_u32(node, "local-addr", &imx6_pcie->local_addr))
 		imx6_pcie->local_addr = 0;
+	if (of_property_read_bool(node, "l1ss-disabled"))
+		imx6_pcie->l1ss_clkreq = 0;
+	else
+		imx6_pcie->l1ss_clkreq = 1;
 
 	/* Fetch GPIOs */
 	imx6_pcie->clkreq_gpio = of_get_named_gpio(node, "clkreq-gpio", 0);
@@ -2932,6 +2936,10 @@ static void imx6_pcie_l1ss_quirk(struct pci_dev *dev)
 	if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_L1SS))
 		return;
 
+	/* Make sure the L1SS is not force disabled. */
+	if (imx6_pcie->l1ss_clkreq == 0)
+		return;
+
 	reg = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_L1SS);
 	rc_l1sub = dw_pcie_readl_dbi(pci, reg + PCI_L1SS_CAP);