From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
Disable all the outbound windows to avoid one transaction hitting
multiple outbound windows, because the function dw_pcie_setup_rc
will re-configure the outbound windows which maybe confict with
the bootloader configured.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
Acked-by: Roy Zang <tie-fei.zang@xxxxxxxxxxxxx>
---
V5:
- No change
drivers/pci/dwc/pci-layerscape.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/pci/dwc/pci-layerscape.c b/drivers/pci/dwc/pci-layerscape.c
index 27234dae4cba..8b5083aedf16 100644
--- a/drivers/pci/dwc/pci-layerscape.c
+++ b/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 the outbound windows configured by bootloader to avoid
+ * one transaction hitting multiple outbound windows and the function
+ * dw_pcie_setup_rc will re-configure 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);
--
2.14.1
