PCI: pciehp: wait 1000 ms before Link Training check

We need to wait for 1000 ms after Data Link Layer Link Active (DLLLA)
bit reads 1b before sending configuration request. Currently pciehp
does this wait after checking Link Training (LT) bit. But we need it
before checking LT bit because LT is still set even after DLLLA bit is
set on some platforms.

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>

2 files changed, 8 insertions, 3 deletions

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 1e9c9aacc3a6..085dbb5fc168 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -213,9 +213,6 @@ static int board_added(struct slot *p_slot)
                 goto err_exit;
         }
 
-        /* Wait for 1 second after checking link training status */
-        msleep(1000);
-
         /* Check for a power fault */
         if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
                 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 6692832c9c81..81a177a5f032 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -280,6 +280,14 @@ int pciehp_check_link_status(struct controller *ctrl)
         else
                 msleep(1000);
 
+        /*
+         * Need to wait for 1000 ms after Data Link Layer Link Active
+         * (DLLLA) bit reads 1b before sending configuration request.
+         * We need it before checking Link Training (LT) bit becuase
+         * LT is still set even after DLLLA bit is set on some platform.
+         */
+        msleep(1000);
+
         retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
         if (retval) {
                 ctrl_err(ctrl, "Cannot read LNKSTATUS register\n");