[PATCH] usb: chipidea: debug: add runtime pm for register access

[Li Jun]

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

Signed-off-by: Li Jun <jun...@freescale.com>
---
 drivers/usb/chipidea/debug.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 3869c6d..080b7be 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -67,9 +67,11 @@ 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);
 
@@ -99,9 +101,11 @@ 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;
 }
@@ -317,8 +321,10 @@ 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;
 }
-- 
1.7.9.5

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