[PATCH v2] usb: chipidea: udc: don't touch DP when controller is in host mode

[PATCH v2] usb: chipidea: udc: don't touch DP when controller is in host mode

[Li Jun]

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.

Cc: <stable@vger.kernel.org> # 4.1+
Signed-off-by: Li Jun <jun.li@nxp.com>
---
 drivers/usb/chipidea/udc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 761b804..846b77bc 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1593,8 +1593,11 @@ static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
 {
 	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);
-- 
1.9.1