usb: renesas_usbhs: use delayed_work instead of work_struct

This delay is used to overjump debounce.

And, this patch also move usbhsc_drvcllbck_notify_hotplug to global,
because it will be called from other files.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 14 insertions, 5 deletions

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index db13cef9effe..9a75a45687bb 100644
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -178,7 +178,7 @@ static void usbhsc_notify_hotplug(struct work_struct *work)
 {
         struct usbhs_priv *priv = container_of(work,
                                                struct usbhs_priv,
-                                               notify_hotplug_work);
+                                               notify_hotplug_work.work);
         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
         int id;
@@ -224,16 +224,17 @@ static void usbhsc_notify_hotplug(struct work_struct *work)
         }
 }
 
-static int usbhsc_drvcllbck_notify_hotplug(struct platform_device *pdev)
+int usbhsc_drvcllbck_notify_hotplug(struct platform_device *pdev)
 {
         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
+        int delay = usbhs_get_dparam(priv, detection_delay);
 
         /*
          * This functions will be called in interrupt.
          * To make sure safety context,
          * use workqueue for usbhs_notify_hotplug
          */
-        schedule_work(&priv->notify_hotplug_work);
+        schedule_delayed_work(&priv->notify_hotplug_work, delay);
         return 0;
 }
 
@@ -300,7 +301,7 @@ static int __devinit usbhs_probe(struct platform_device *pdev)
          */
         priv->irq       = irq;
         priv->pdev      = pdev;
-        INIT_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug);
+        INIT_DELAYED_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug);
         spin_lock_init(usbhs_priv_to_lock(priv));
 
         /* call pipe and module init */
diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index f3b907d26082..0157eb805cf6 100644
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -177,7 +177,7 @@ struct usbhs_priv {
         struct renesas_usbhs_platform_callback  *pfunc;
         struct renesas_usbhs_driver_param       *dparam;
 
-        struct work_struct notify_hotplug_work;
+        struct delayed_work notify_hotplug_work;
         struct platform_device *pdev;
 
         spinlock_t              lock;
@@ -200,6 +200,7 @@ u16 usbhs_read(struct usbhs_priv *priv, u32 reg);
 void usbhs_write(struct usbhs_priv *priv, u32 reg, u16 data);
 void usbhs_bset(struct usbhs_priv *priv, u32 reg, u16 mask, u16 data);
 
+int usbhsc_drvcllbck_notify_hotplug(struct platform_device *pdev);
 /*
  * sysconfig
  */
diff --git a/include/linux/usb/renesas_usbhs.h b/include/linux/usb/renesas_usbhs.h
index 66bbdd12d153..3a7f1d982dd6 100644
--- a/include/linux/usb/renesas_usbhs.h
+++ b/include/linux/usb/renesas_usbhs.h
@@ -103,6 +103,13 @@ struct renesas_usbhs_driver_param {
          * for BUSWAIT :: BWAIT
          * */
         int buswait_bwait;
+
+        /*
+         * option:
+         *
+         * delay time from notify_hotplug callback
+         */
+        int detection_delay;
 };
 
 /*