usb: gadget: zero: Add flexible auto remote wakeup test method

In order to increase test coverage, we can change the interval between
two remote wakeups every time, and the interval can be any user defined
value. This change will no affect current behavior if the user does not
use two introduced module paramters.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index 0deb9d6cde26245fd1c52c0b541eecd100aedce6..0dd07ae1555ddf066312e0ff4e8182a02f27a3d6 100644 (file)
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -95,6 +95,18 @@ unsigned autoresume = DEFAULT_AUTORESUME;
 module_param(autoresume, uint, S_IRUGO);
 MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
 
+/* Maximum Autoresume time */
+unsigned max_autoresume;
+module_param(max_autoresume, uint, S_IRUGO);
+MODULE_PARM_DESC(max_autoresume, "maximum seconds before remote wakeup");
+
+/* Interval between two remote wakeups */
+unsigned autoresume_interval_ms;
+module_param(autoresume_interval_ms, uint, S_IRUGO);
+MODULE_PARM_DESC(autoresume_interval_ms,
+               "milliseconds to increase successive wakeup delays");
+
+static unsigned autoresume_step_ms;
 /*-------------------------------------------------------------------------*/
 
 static struct usb_device_descriptor device_desc = {
@@ -183,8 +195,16 @@ static void zero_suspend(struct usb_composite_dev *cdev)
                return;
 
        if (autoresume) {
-               mod_timer(&autoresume_timer, jiffies + (HZ * autoresume));
-               DBG(cdev, "suspend, wakeup in %d seconds\n", autoresume);
+               if (max_autoresume &&
+                       (autoresume_step_ms > max_autoresume * 1000))
+                               autoresume_step_ms = autoresume * 1000;
+
+               mod_timer(&autoresume_timer, jiffies +
+                       msecs_to_jiffies(autoresume_step_ms));
+               DBG(cdev, "suspend, wakeup in %d milliseconds\n",
+                       autoresume_step_ms);
+
+               autoresume_step_ms += autoresume_interval_ms;
        } else
                DBG(cdev, "%s\n", __func__);
 }
@@ -316,6 +336,7 @@ static int __init zero_bind(struct usb_composite_dev *cdev)
        if (autoresume) {
                sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
                loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+               autoresume_step_ms = autoresume * 1000;
        }
 
        /* support OTG systems */