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usb: gadget: udc: renesas_usb3: Fix b-device mode for "workaround"

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commit afc92514a3 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: 43ba968b00 ("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>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda
2018-10-02 20:57:44 +09:00
committed by Greg Kroah-Hartman
parent 255624a35b
commit c459fed018
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/gadget/udc/renesas_usb3.c
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@@ -2374,6 +2374,9 @@ 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);