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path: root/drivers/pci/hotplug/pciehp_hpc.c
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Diffstat (limited to 'drivers/pci/hotplug/pciehp_hpc.c')
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index b2255736ac81..51f56ef4ab6f 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -749,6 +749,37 @@ static void pcie_disable_notification(struct controller *ctrl)
ctrl_warn(ctrl, "Cannot disable software notification\n");
}
+/*
+ * pciehp has a 1:1 bus:slot relationship so we ultimately want a secondary
+ * bus reset of the bridge, but if the slot supports surprise removal we need
+ * to disable presence detection around the bus reset and clear any spurious
+ * events after.
+ */
+int pciehp_reset_slot(struct slot *slot, int probe)
+{
+ struct controller *ctrl = slot->ctrl;
+
+ if (probe)
+ return 0;
+
+ if (HP_SUPR_RM(ctrl)) {
+ pcie_write_cmd(ctrl, 0, PCI_EXP_SLTCTL_PDCE);
+ if (pciehp_poll_mode)
+ del_timer_sync(&ctrl->poll_timer);
+ }
+
+ pci_reset_bridge_secondary_bus(ctrl->pcie->port);
+
+ if (HP_SUPR_RM(ctrl)) {
+ pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_PDC);
+ pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PDCE, PCI_EXP_SLTCTL_PDCE);
+ if (pciehp_poll_mode)
+ int_poll_timeout(ctrl->poll_timer.data);
+ }
+
+ return 0;
+}
+
int pcie_init_notification(struct controller *ctrl)
{
if (pciehp_request_irq(ctrl))