thunderbolt: Add suspend/hibernate support

We use _noirq since we have to restore the pci tunnels before the pci
core wakes the tunneled devices.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index d2b9ce857818..346b41e7d5d1 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -7,6 +7,7 @@
  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
  */
 
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/pci.h>
@@ -492,6 +493,22 @@ static irqreturn_t nhi_msi(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+static int nhi_suspend_noirq(struct device *dev)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        struct tb *tb = pci_get_drvdata(pdev);
+        thunderbolt_suspend(tb);
+        return 0;
+}
+
+static int nhi_resume_noirq(struct device *dev)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        struct tb *tb = pci_get_drvdata(pdev);
+        thunderbolt_resume(tb);
+        return 0;
+}
+
 static void nhi_shutdown(struct tb_nhi *nhi)
 {
         int i;
@@ -600,6 +617,21 @@ static void nhi_remove(struct pci_dev *pdev)
         nhi_shutdown(nhi);
 }
 
+/*
+ * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
+ * the tunnels asap. A corresponding pci quirk blocks the downstream bridges
+ * resume_noirq until we are done.
+ */
+static const struct dev_pm_ops nhi_pm_ops = {
+        .suspend_noirq = nhi_suspend_noirq,
+        .resume_noirq = nhi_resume_noirq,
+        .freeze_noirq = nhi_suspend_noirq, /*
+                                            * we just disable hotplug, the
+                                            * pci-tunnels stay alive.
+                                            */
+        .restore_noirq = nhi_resume_noirq,
+};
+
 struct pci_device_id nhi_ids[] = {
         /*
          * We have to specify class, the TB bridges use the same device and
@@ -626,6 +658,7 @@ static struct pci_driver nhi_driver = {
         .id_table = nhi_ids,
         .probe = nhi_probe,
         .remove = nhi_remove,
+        .driver.pm = &nhi_pm_ops,
 };
 
 static int __init nhi_init(void)