usb: musb: fix otg default state

Right after the musb_hdrc driver is loaded, the otg default state
is a_idle, and Mode=Host, which are set by musb_host_setup().

This causes the following kernel message during musb gadget
enumeration.

	CAUTION: musb: Babble Interrupt Occurred

This patch sets the otg default state to b_idle, and its Mode to
Peripheral.

It has been validated on TI AM335x GP EVM USB0 port with g_zero.

Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 9a08679d204dfe9ee6fb1ad421813ea329c25abd..58c029f1e74c7513c5dd137fb1d582e4073f48dc 100644 (file)
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1790,6 +1790,10 @@ int musb_gadget_setup(struct musb *musb)
        musb->g.max_speed = USB_SPEED_HIGH;
        musb->g.speed = USB_SPEED_UNKNOWN;
 
+       MUSB_DEV_MODE(musb);
+       musb->xceiv->otg->default_a = 0;
+       musb->xceiv->state = OTG_STATE_B_IDLE;
+
        /* this "gadget" abstracts/virtualizes the controller */
        musb->g.name = musb_driver_name;
        musb->g.is_otg = 1;