usb: gadget: core: fix ->udc_set_speed() logic

Consider the following case: udc controller supports SuperSpeed.  If we
first load a HighSpeed gadget followed by a SuperSpeed gadget, the
SuperSpeed gadget will be limited to HighSpeed as UDC core driver
doesn't call ->udc_set_speed() in the second case.

Call ->udc_set_speed() unconditionally to fix this issue.

This will also fix the case for dwc3 controller driver when SuperSpeed
gadget is loaded first and works in HighSpeed only as udc_set_speed()
was never being called.

Fixes: 6099eca796ae ("usb: gadget: core: introduce ->udc_set_speed() method")
Cc: <stable@vger.kernel.org> [v4.13+]
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 75c51ca..d41d07a 100644 (file)
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1320,8 +1320,7 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
        udc->dev.driver = &driver->driver;
        udc->gadget->dev.driver = &driver->driver;
 
-       if (driver->max_speed < udc->gadget->max_speed)
-               usb_gadget_udc_set_speed(udc, driver->max_speed);
+       usb_gadget_udc_set_speed(udc, driver->max_speed);
 
        ret = driver->bind(udc->gadget, driver);
        if (ret)