PCI: dwc: Wait for link up only if link is started

In dw_pcie_host_init() regardless of whether the link has been
started or not, the code waits for the link to come up. Even in
cases where start_link() is not defined the code ends up spinning
in a loop for 1 second. Since in some systems dw_pcie_host_init()
gets called during probe, this one second loop for each pcie
interface instance ends up extending the boot time.

Wait for the link up in only if the start_link() is defined.

Link: https://lore.kernel.org/r/[email protected]
Tested-by: Will McVicker <[email protected]>
Signed-off-by: Sajid Dalvi <[email protected]>
Signed-off-by: Ajay Agarwal <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 9952057c8819..cf61733bf78d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -485,14 +485,19 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
 	if (ret)
 		goto err_remove_edma;
 
-	if (!dw_pcie_link_up(pci)) {
+	if (dw_pcie_link_up(pci)) {
+		dw_pcie_print_link_status(pci);
+	} else {
 		ret = dw_pcie_start_link(pci);
 		if (ret)
 			goto err_remove_edma;
-	}
 
-	/* Ignore errors, the link may come up later */
-	dw_pcie_wait_for_link(pci);
+		if (pci->ops && pci->ops->start_link) {
+			ret = dw_pcie_wait_for_link(pci);
+			if (ret)
+				goto err_stop_link;
+		}
+	}
 
 	bridge->sysdata = pp;