PCI: layerscape: Disable outbound windows configured by bootloader

Disable all the outbound windows to avoid one transaction hitting multiple
outbound windows.  dw_pcie_setup_rc() will reconfigure the outbound
windows, which may conflict with windows configured by the bootloader.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Roy Zang <tie-fei.zang@freescale.com>

drivers/pci/dwc/pci-layerscape.c

@@ -35,6 +35,8 @@
 #define PCIE_STRFMR1		0x71c /* Symbol Timer & Filter Mask Register1 */
 #define PCIE_DBI_RO_WR_EN	0x8bc /* DBI Read-Only Write Enable Register */
 
+#define PCIE_IATU_NUM		6
+
 struct ls_pcie_drvdata {
 	u32 lut_offset;
 	u32 ltssm_shift;
@@ -91,6 +93,14 @@ static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
 	iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
 }
 
+static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
+{
+	int i;
+
+	for (i = 0; i < PCIE_IATU_NUM; i++)
+		dw_pcie_disable_atu(pcie->pci, DW_PCIE_REGION_OUTBOUND, i);
+}
+
 static int ls1021_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 state;
@@ -128,6 +138,13 @@ static int ls_pcie_host_init(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct ls_pcie *pcie = to_ls_pcie(pci);
 
+	/*
+	 * Disable outbound windows configured by the bootloader to avoid
+	 * one transaction hitting multiple outbound windows.
+	 * dw_pcie_setup_rc() will reconfigure the outbound windows.
+	 */
+	ls_pcie_disable_outbound_atus(pcie);
+
 	iowrite32(1, pci->dbi_base + PCIE_DBI_RO_WR_EN);
 	ls_pcie_fix_class(pcie);
 	ls_pcie_clear_multifunction(pcie);