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path: root/drivers/bus/mhi/host/pm.c
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Diffstat (limited to 'drivers/bus/mhi/host/pm.c')
-rw-r--r--drivers/bus/mhi/host/pm.c42
1 files changed, 36 insertions, 6 deletions
diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c
index 8b40d3f01a..11c0e751f2 100644
--- a/drivers/bus/mhi/host/pm.c
+++ b/drivers/bus/mhi/host/pm.c
@@ -468,7 +468,8 @@ error_mission_mode:
}
/* Handle shutdown transitions */
-static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl)
+static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
+ bool destroy_device)
{
enum mhi_pm_state cur_state;
struct mhi_event *mhi_event;
@@ -530,8 +531,16 @@ skip_mhi_reset:
dev_dbg(dev, "Waiting for all pending threads to complete\n");
wake_up_all(&mhi_cntrl->state_event);
- dev_dbg(dev, "Reset all active channels and remove MHI devices\n");
- device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device);
+ /*
+ * Only destroy the 'struct device' for channels if indicated by the
+ * 'destroy_device' flag. Because, during system suspend or hibernation
+ * state, there is no need to destroy the 'struct device' as the endpoint
+ * device would still be physically attached to the machine.
+ */
+ if (destroy_device) {
+ dev_dbg(dev, "Reset all active channels and remove MHI devices\n");
+ device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device);
+ }
mutex_lock(&mhi_cntrl->pm_mutex);
@@ -821,7 +830,10 @@ void mhi_pm_st_worker(struct work_struct *work)
mhi_pm_sys_error_transition(mhi_cntrl);
break;
case DEV_ST_TRANSITION_DISABLE:
- mhi_pm_disable_transition(mhi_cntrl);
+ mhi_pm_disable_transition(mhi_cntrl, false);
+ break;
+ case DEV_ST_TRANSITION_DISABLE_DESTROY_DEVICE:
+ mhi_pm_disable_transition(mhi_cntrl, true);
break;
default:
break;
@@ -1175,7 +1187,8 @@ error_exit:
}
EXPORT_SYMBOL_GPL(mhi_async_power_up);
-void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful)
+static void __mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful,
+ bool destroy_device)
{
enum mhi_pm_state cur_state, transition_state;
struct device *dev = &mhi_cntrl->mhi_dev->dev;
@@ -1211,15 +1224,32 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful)
write_unlock_irq(&mhi_cntrl->pm_lock);
mutex_unlock(&mhi_cntrl->pm_mutex);
- mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_DISABLE);
+ if (destroy_device)
+ mhi_queue_state_transition(mhi_cntrl,
+ DEV_ST_TRANSITION_DISABLE_DESTROY_DEVICE);
+ else
+ mhi_queue_state_transition(mhi_cntrl,
+ DEV_ST_TRANSITION_DISABLE);
/* Wait for shutdown to complete */
flush_work(&mhi_cntrl->st_worker);
disable_irq(mhi_cntrl->irq[0]);
}
+
+void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful)
+{
+ __mhi_power_down(mhi_cntrl, graceful, true);
+}
EXPORT_SYMBOL_GPL(mhi_power_down);
+void mhi_power_down_keep_dev(struct mhi_controller *mhi_cntrl,
+ bool graceful)
+{
+ __mhi_power_down(mhi_cntrl, graceful, false);
+}
+EXPORT_SYMBOL_GPL(mhi_power_down_keep_dev);
+
int mhi_sync_power_up(struct mhi_controller *mhi_cntrl)
{
int ret = mhi_async_power_up(mhi_cntrl);