Commit 1374a430 authored Sep 17, 2013 by Bin Liu Committed by Felipe Balbi Sep 17, 2013

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>

parent d3675e3a

drivers/usb/musb/musb_gadget.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;