[PATCH] usb: musb: Support gadget mode when the port is set to dual role

[Paul Kocialkowski <contact@paulk.fr>]

This allows dual-role ports to be reported as having gadget mode by the
musb_has_gadget helper. This is required to enable MUSB at all with MUSB
glue layers that set the port mode to MUSB_PORT_MODE_DUAL_ROLE at init.

Most notably, this allows calling musb_start when needed in the virtual
MUSB root HUB, regardless of whether the current mode should be gadget
or host.

This fixes USB OTG on Allwinner devices that I could test it with,
mainly A20 devices.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
---
 drivers/usb/musb/musb_virthub.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index 5165d2b07ade..8fd5c5f86e82 100644
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -249,7 +249,8 @@ static int musb_has_gadget(struct musb *musb)
 #ifdef CONFIG_USB_MUSB_HOST
 	return 1;
 #else
-	return musb->port_mode == MUSB_PORT_MODE_HOST;
+	return musb->port_mode == MUSB_PORT_MODE_HOST ||
+	       musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE;
 #endif
 }
 
-- 
2.16.2