usb: fix musb gadget to enable OTG mode conditionally

The musb driver is usable in host, gadget or dual role mode depending
on the kernel configuration.

However, the musb gadget part of the driver is enabling OTG mode
whether the driver is built for dual role or gadget only mode. This
induces a bug for gadget only USB device controllers where the kernel
tries to use Host Negotiation Protocol with such controllers, which
causes a panic.

This behaviour is now fixed by enabling OTG mode only when musb driver
is built for dual role mode.

Signed-off-by: Apelete Seketeli <apelete@seketeli.net>
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 d2d3a173b31503b54f9071e9af48f4878567856f..32fb057c03f58e25f401bdb49755e2cdc2637e86 100644 (file)
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1796,7 +1796,11 @@ int musb_gadget_setup(struct musb *musb)
 
        /* this "gadget" abstracts/virtualizes the controller */
        musb->g.name = musb_driver_name;
+#if IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE)
        musb->g.is_otg = 1;
+#elif IS_ENABLED(CONFIG_USB_MUSB_GADGET)
+       musb->g.is_otg = 0;
+#endif
 
        musb_g_init_endpoints(musb);