PCI: pciehp: wait 100 ms after Link Training check

If the port supports Link speeds greater than 5.0 GT/s, we must wait
for 100 ms after Link training completes before sending configuration
request.

Acked-by: Yinghai Lu <yinghai@kernel.org>
Tested-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 81a177a5f032..7b1414810ae3 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -302,6 +302,14 @@ int pciehp_check_link_status(struct controller *ctrl)
                 return retval;
         }
 
+        /*
+         * If the port supports Link speeds greater than 5.0 GT/s, we
+         * must wait for 100 ms after Link training completes before
+         * sending configuration request.
+         */
+        if (ctrl->pcie->port->subordinate->max_bus_speed > PCIE_SPEED_5_0GT)
+                msleep(100);
+
         pcie_update_link_speed(ctrl->pcie->port->subordinate, lnk_status);
 
         return retval;