thunderbolt: Only stop control channel when entering freeze

According to the kernel power management documentation freeze phase
should only quiesce the device, no need to configure wakes or put it to
low power state. For this reason we simply stop the control channel and
in case of Software Connection Manager also mark the hotplug disabled.
This should align the driver better with the PM framework expectations.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

4 files changed, 69 insertions, 3 deletions

diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c
index 00d66f06804a..a0182bf5a5f8 100644
--- a/drivers/thunderbolt/domain.c
+++ b/drivers/thunderbolt/domain.c
@@ -546,6 +546,33 @@ int tb_domain_suspend(struct tb *tb)
 	return tb->cm_ops->suspend ? tb->cm_ops->suspend(tb) : 0;
 }
 
+int tb_domain_freeze_noirq(struct tb *tb)
+{
+	int ret = 0;
+
+	mutex_lock(&tb->lock);
+	if (tb->cm_ops->freeze_noirq)
+		ret = tb->cm_ops->freeze_noirq(tb);
+	if (!ret)
+		tb_ctl_stop(tb->ctl);
+	mutex_unlock(&tb->lock);
+
+	return ret;
+}
+
+int tb_domain_thaw_noirq(struct tb *tb)
+{
+	int ret = 0;
+
+	mutex_lock(&tb->lock);
+	tb_ctl_start(tb->ctl);
+	if (tb->cm_ops->thaw_noirq)
+		ret = tb->cm_ops->thaw_noirq(tb);
+	mutex_unlock(&tb->lock);
+
+	return ret;
+}
+
 void tb_domain_complete(struct tb *tb)
 {
 	if (tb->cm_ops->complete)
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index bd24e8254336..3f79baa54829 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -864,6 +864,22 @@ static int nhi_suspend_noirq(struct device *dev)
 	return __nhi_suspend_noirq(dev, device_may_wakeup(dev));
 }
 
+static int nhi_freeze_noirq(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct tb *tb = pci_get_drvdata(pdev);
+
+	return tb_domain_freeze_noirq(tb);
+}
+
+static int nhi_thaw_noirq(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct tb *tb = pci_get_drvdata(pdev);
+
+	return tb_domain_thaw_noirq(tb);
+}
+
 static bool nhi_wake_supported(struct pci_dev *pdev)
 {
 	u8 val;
@@ -1255,14 +1271,13 @@ static void nhi_remove(struct pci_dev *pdev)
 static const struct dev_pm_ops nhi_pm_ops = {
 	.suspend_noirq = nhi_suspend_noirq,
 	.resume_noirq = nhi_resume_noirq,
-	.freeze_noirq = nhi_suspend_noirq, /*
+	.freeze_noirq = nhi_freeze_noirq,  /*
 					    * we just disable hotplug, the
 					    * pci-tunnels stay alive.
 					    */
-	.thaw_noirq = nhi_resume_noirq,
+	.thaw_noirq = nhi_thaw_noirq,
 	.restore_noirq = nhi_resume_noirq,
 	.suspend = nhi_suspend,
-	.freeze = nhi_suspend,
 	.poweroff_noirq = nhi_poweroff_noirq,
 	.poweroff = nhi_suspend,
 	.complete = nhi_complete,
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 170d1d846557..214fbc92c1b7 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -1424,6 +1424,22 @@ static int tb_free_unplugged_xdomains(struct tb_switch *sw)
 	return ret;
 }
 
+static int tb_freeze_noirq(struct tb *tb)
+{
+	struct tb_cm *tcm = tb_priv(tb);
+
+	tcm->hotplug_active = false;
+	return 0;
+}
+
+static int tb_thaw_noirq(struct tb *tb)
+{
+	struct tb_cm *tcm = tb_priv(tb);
+
+	tcm->hotplug_active = true;
+	return 0;
+}
+
 static void tb_complete(struct tb *tb)
 {
 	/*
@@ -1490,6 +1506,8 @@ static const struct tb_cm_ops tb_cm_ops = {
 	.stop = tb_stop,
 	.suspend_noirq = tb_suspend_noirq,
 	.resume_noirq = tb_resume_noirq,
+	.freeze_noirq = tb_freeze_noirq,
+	.thaw_noirq = tb_thaw_noirq,
 	.complete = tb_complete,
 	.runtime_suspend = tb_runtime_suspend,
 	.runtime_resume = tb_runtime_resume,
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 450f9cf16005..8b04a9deffc7 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -351,6 +351,8 @@ struct tb_path {
  * @suspend_noirq: Connection manager specific suspend_noirq
  * @resume_noirq: Connection manager specific resume_noirq
  * @suspend: Connection manager specific suspend
+ * @freeze_noirq: Connection manager specific freeze_noirq
+ * @thaw_noirq: Connection manager specific thaw_noirq
  * @complete: Connection manager specific complete
  * @runtime_suspend: Connection manager specific runtime_suspend
  * @runtime_resume: Connection manager specific runtime_resume
@@ -373,6 +375,8 @@ struct tb_cm_ops {
 	int (*suspend_noirq)(struct tb *tb);
 	int (*resume_noirq)(struct tb *tb);
 	int (*suspend)(struct tb *tb);
+	int (*freeze_noirq)(struct tb *tb);
+	int (*thaw_noirq)(struct tb *tb);
 	void (*complete)(struct tb *tb);
 	int (*runtime_suspend)(struct tb *tb);
 	int (*runtime_resume)(struct tb *tb);
@@ -607,6 +611,8 @@ void tb_domain_remove(struct tb *tb);
 int tb_domain_suspend_noirq(struct tb *tb);
 int tb_domain_resume_noirq(struct tb *tb);
 int tb_domain_suspend(struct tb *tb);
+int tb_domain_freeze_noirq(struct tb *tb);
+int tb_domain_thaw_noirq(struct tb *tb);
 void tb_domain_complete(struct tb *tb);
 int tb_domain_runtime_suspend(struct tb *tb);
 int tb_domain_runtime_resume(struct tb *tb);