PCI: dwc: Return directly when num-lanes is not found

The num-lanes is optional since it is not needed on some platforms
that bring up the link in firmware.

The link programming is based on the num-lanes properties (which is
optional); if it is not present code must return instead of fiddling
with the lanes value to print an error message.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 7d25102c304c..0a89bfd1636e 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -423,8 +423,10 @@ void dw_pcie_setup(struct dw_pcie *pci)
 
 
         ret = of_property_read_u32(np, "num-lanes", &lanes);
-        if (ret)
-                lanes = 0;
+        if (ret) {
+                dev_dbg(pci->dev, "property num-lanes isn't found\n");
+                return;
+        }
 
         /* Set the number of lanes */
         val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);