usb: chipidea: debug: add runtime pm for register access

Add runtime pm operations for registers access to avoid system hang.

Signed-off-by: Li Jun <jun.li@freescale.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 5b7061a33103..64b6a4735876 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -66,9 +66,11 @@ static int ci_port_test_show(struct seq_file *s, void *data)
         unsigned long flags;
         unsigned mode;
 
+        pm_runtime_get_sync(ci->dev);
         spin_lock_irqsave(&ci->lock, flags);
         mode = hw_port_test_get(ci);
         spin_unlock_irqrestore(&ci->lock, flags);
+        pm_runtime_put_sync(ci->dev);
 
         seq_printf(s, "mode = %u\n", mode);
 
@@ -98,9 +100,11 @@ static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf,
         if (sscanf(buf, "%u", &mode) != 1)
                 return -EINVAL;
 
+        pm_runtime_get_sync(ci->dev);
         spin_lock_irqsave(&ci->lock, flags);
         ret = hw_port_test_set(ci, mode);
         spin_unlock_irqrestore(&ci->lock, flags);
+        pm_runtime_put_sync(ci->dev);
 
         return ret ? ret : count;
 }
@@ -316,8 +320,10 @@ static ssize_t ci_role_write(struct file *file, const char __user *ubuf,
         if (role == CI_ROLE_END || role == ci->role)
                 return -EINVAL;
 
+        pm_runtime_get_sync(ci->dev);
         ci_role_stop(ci);
         ret = ci_role_start(ci, role);
+        pm_runtime_put_sync(ci->dev);
 
         return ret ? ret : count;
 }