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Commit 2f076077 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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USB: GADGET: optionally force full-speed for net2280 UDC 



This patch (as1656) adds a module parameter to the net2280 UDC driver
to force full-speed operation.  It is intended for testing purposes,
where one wants to check how well a full-speed device performs when
attached to a high-speed bus.  Without this parameter it would be
necessary to interpose a full-speed hub; otherwise the net2280 would
connect at high speed.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Acked-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d0b4652f

drivers/usb/gadget/net2280.c

+15 −0
Original line number Diff line number Diff line
@@ -116,6 +116,10 @@ static bool enable_suspend = 0; 
/* "modprobe net2280 enable_suspend=1" etc */

module_param (enable_suspend, bool, S_IRUGO);



/* force full-speed operation */

static bool full_speed;

module_param(full_speed, bool, 0444);

MODULE_PARM_DESC(full_speed, "force full-speed mode -- for testing only!");



#define	DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
@@ -1899,6 +1903,10 @@ static int net2280_start(struct usb_gadget *_gadget, 
	retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);

	if (retval) goto err_func;



	/* Enable force-full-speed testing mode, if desired */

	if (full_speed)

		writel(1 << FORCE_FULL_SPEED_MODE, &dev->usb->xcvrdiag);



	/* ... then enable host detection and ep0; and we're ready

	 * for set_configuration as well as eventual disconnect.

	 */
@@ -1957,6 +1965,10 @@ static int net2280_stop(struct usb_gadget *_gadget, 
	dev->driver = NULL;



	net2280_led_active (dev, 0);



	/* Disable full-speed test mode */

	writel(0, &dev->usb->xcvrdiag);



	device_remove_file (&dev->pdev->dev, &dev_attr_function);

	device_remove_file (&dev->pdev->dev, &dev_attr_queues);
@@ -2841,6 +2853,9 @@ static void net2280_shutdown (struct pci_dev *pdev) 


	/* disable the pullup so the host will think we're gone */

	writel (0, &dev->usb->usbctl);



	/* Disable full-speed test mode */

	writel(0, &dev->usb->xcvrdiag);

}