When the Root Complex is probed, the default behavior is to spin in a loop waiting for the link to come up. In some systems the link is not brought up during probe, but later in the context of an end-point turning on. Call trace: dw_pcie_wait_for_link << spins in a loop for 1 second dw_pcie_host_init Adding the snps,skip-wait-link-up property in the pcie device tree node will skip this loop and save 1 second per interface on pcie probe for systems that do not need to bring up the link this early in the boot sequence. Signed-off-by: Sajid Dalvi <sdalvi@xxxxxxxxxx> Signed-off-by: Andrew Chant <achant@xxxxxxxxxx> --- drivers/pci/controller/dwc/pcie-designware-host.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 3ab6ae3712c4..f5cba44ebf39 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -477,8 +477,9 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp) goto err_free_msi; } - /* Ignore errors, the link may come up later */ - dw_pcie_wait_for_link(pci); + if (!of_property_read_bool(np, "snps,skip-wait-link-up")) + /* Ignore errors, the link may come up later */ + dw_pcie_wait_for_link(pci); bridge->sysdata = pp; -- 2.39.2.637.g21b0678d19-goog
