diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2013-01-31 01:40:14 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-31 13:09:19 +0400 |
| commit | 2f0760774711c957c395b31131b848043af98edf (patch) | |
| tree | 578d8100d72f68045516cd6be3682db1747aaaf9 /drivers/usb/gadget/net2280.c | |
| parent | d0b4652f80c3276a57ede3b6b6d8159fa26c091f (diff) | |
| download | linux-2f0760774711c957c395b31131b848043af98edf.tar.xz | |
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: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/gadget/net2280.c')
| -rw-r--r-- | drivers/usb/gadget/net2280.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c index 708c0b55dcc8..a1b650e11339 100644 --- a/drivers/usb/gadget/net2280.c +++ b/drivers/usb/gadget/net2280.c @@ -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); } |