If the "workaround_for_vbus" is true, the driver will not call usb_disconnect(). So, since the controller keeps some registers' value, the driver doesn't re-enumarate suitable speed after the b-device mode is disabled. To fix the issue, this patch adds usb_disconnect() calling in renesas_usb3_b_device_write() if workaround_for_vbus is true.
Fixes: 43ba968b00ea ("usb: gadget: udc: renesas_usb3: add debugfs to set the b-device mode") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com --- drivers/usb/gadget/udc/renesas_usb3.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index e1656f3..67d8a50 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -2437,6 +2437,9 @@ static ssize_t renesas_usb3_b_device_write(struct file *file, else usb3->forced_b_device = false;
+ if (usb3->workaround_for_vbus) + usb3_disconnect(usb3); + /* Let this driver call usb3_connect() anyway */ usb3_check_id(usb3);