4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
commit afc92514a34c7414b28047b1205a6b709103c699 upstream.
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@xxxxxxxxxxxxxxx> # v4.14+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/udc/renesas_usb3.c | 3 +++
1 file changed, 3 insertions(+)
--- 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_wri
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);
