Merge branch 'pci/controller/qcom-ep'

- Add qcom-ep callback to write DBI2 registers (Manivannan Sadhasivam)

* pci/controller/qcom-ep:
  PCI: qcom-ep: Add dedicated callback for writing to DBI2 registers

Author: bjorn-helgaas

drivers/pci/controller/dwc/pcie-qcom-ep.c

@@ -123,6 +123,7 @@
 
 /* ELBI registers */
 #define ELBI_SYS_STTS				0x08
+#define ELBI_CS2_ENABLE				0xa4
 
 /* DBI registers */
 #define DBI_CON_STATUS				0x44
@@ -263,6 +264,21 @@ static void qcom_pcie_dw_stop_link(struct dw_pcie *pci)
 	disable_irq(pcie_ep->perst_irq);
 }
 
+static void qcom_pcie_dw_write_dbi2(struct dw_pcie *pci, void __iomem *base,
+				    u32 reg, size_t size, u32 val)
+{
+	struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
+	int ret;
+
+	writel(1, pcie_ep->elbi + ELBI_CS2_ENABLE);
+
+	ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
+	if (ret)
+		dev_err(pci->dev, "Failed to write DBI2 register (0x%x): %d\n", reg, ret);
+
+	writel(0, pcie_ep->elbi + ELBI_CS2_ENABLE);
+}
+
 static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep)
 {
 	struct dw_pcie *pci = &pcie_ep->pci;
@@ -519,6 +535,7 @@ static const struct dw_pcie_ops pci_ops = {
 	.link_up = qcom_pcie_dw_link_up,
 	.start_link = qcom_pcie_dw_start_link,
 	.stop_link = qcom_pcie_dw_stop_link,
+	.write_dbi2 = qcom_pcie_dw_write_dbi2,
 };
 
 static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev,