linux-kernel - [PATCH] usb: gadget: udc: renesas_usb3: Fix host to USB_ROLE

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Date:   Fri, 28 Jan 2022 16:36:03 -0600
From:   Adam Ford <aford173@...il.com>
To:     linux-usb@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org, cstevens@...conembedded.com,
        aford@...conembedded.com, Adam Ford <aford173@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Biju Das <biju.das@...renesas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: udc: renesas_usb3: Fix host to USB_ROLE_NONE transition

The support the external role switch a variety of situations were
addressed, but the transition from USB_ROLE_HOST to USB_ROLE_NONE
leaves the host up which can cause some error messages when
switching from host to none, to gadget, to none, and then back
to host again.

 xhci-hcd ee000000.usb: Abort failed to stop command ring: -110
 xhci-hcd ee000000.usb: xHCI host controller not responding, assume dead
 xhci-hcd ee000000.usb: HC died; cleaning up
 usb 4-1: device not accepting address 6, error -108
 usb usb4-port1: couldn't allocate usb_device

After this happens it will not act as a host again.
Fix this by releasing the host mode when transitioning to USB_ROLE_NONE.

Fixes: 0604160d8c0b ("usb: gadget: udc: renesas_usb3: Enhance role switch support")
Signed-off-by: Adam Ford <aford173@...il.com>

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 57d417a7c3e0..601829a6b4ba 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -2378,6 +2378,8 @@ static void handle_ext_role_switch_states(struct device *dev,
 	switch (role) {
 	case USB_ROLE_NONE:
 		usb3->connection_state = USB_ROLE_NONE;
+		if (cur_role == USB_ROLE_HOST)
+			device_release_driver(host);
 		if (usb3->driver)
 			usb3_disconnect(usb3);
 		usb3_vbus_out(usb3, false);
-- 
2.32.0