Port of Linux commit 66de33f09fd97201847de7e1e2ec8a117242e1d6
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@xxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Reviewed-by: Andrew Murray <andrew.murray@xxxxxxx>
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/pci/pcie-designware.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pcie-designware.c b/drivers/pci/pcie-designware.c
index 72deeee4ed..e2007dba6d 100644
--- a/drivers/pci/pcie-designware.c
+++ b/drivers/pci/pcie-designware.c
@@ -295,8 +295,10 @@ 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);
--
2.24.0
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