linux-kernel - [PATCH 4.4 095/113] usb: chipidea: udc: dont touch DP when controller is in host mode

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Message-Id: <20160905164353.228166695@linuxfoundation.org>
Date:   Mon,  5 Sep 2016 18:44:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Li Jun <jun.li@....com>,
        Peter Chen <peter.chen@....com>
Subject: [PATCH 4.4 095/113] usb: chipidea: udc: dont touch DP when controller is in host mode

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Jun <jun.li@....com>

commit c4e94174983a86c935be1537a73e496b778b0287 upstream.

When the controller is configured to be dual role and it's in host mode,
if bind udc and gadgt driver, those gadget operations will do gadget
disconnect and finally pull down DP line, which will break host function.

Signed-off-by: Li Jun <jun.li@....com>
Signed-off-by: Peter Chen <peter.chen@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/chipidea/udc.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1585,8 +1585,11 @@ static int ci_udc_pullup(struct usb_gadg
 {
 	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
 
-	/* Data+ pullup controlled by OTG state machine in OTG fsm mode */
-	if (ci_otg_is_fsm_mode(ci))
+	/*
+	 * Data+ pullup controlled by OTG state machine in OTG fsm mode;
+	 * and don't touch Data+ in host mode for dual role config.
+	 */
+	if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
 		return 0;
 
 	pm_runtime_get_sync(&ci->gadget.dev);