[PATCH 3.19.y-ckt 065/107] usb: musb: host: rely on port_mode to call musb_start()

From: Kamal Mostafa
Date: Wed Aug 05 2015 - 18:05:00 EST


3.19.8-ckt5 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Felipe Balbi <balbi@xxxxxx>

commit be9d39881fc4fa39a64b6eed6bab5d9ee5125344 upstream.

Currently, we're calling musb_start() twice for DRD ports
in some situations. This has been observed to cause enumeration
issues after suspend/resume cycles with AM335x.

In order to fix the problem, we just have to fix the check
on musb_has_gadget() so that it only returns true if
current mode is Host and ignore the fact that we have or
not a gadget driver loaded.

Fixes: ae44df2e21b5 (usb: musb: call musb_start() only once in OTG mode)
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Tested-by: Sekhar Nori <nsekhar@xxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/usb/musb/musb_virthub.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index a9c47315..d91dac9 100644
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -274,9 +274,7 @@ static int musb_has_gadget(struct musb *musb)
#ifdef CONFIG_USB_MUSB_HOST
return 1;
#else
- if (musb->port_mode == MUSB_PORT_MODE_HOST)
- return 1;
- return musb->g.dev.driver != NULL;
+ return musb->port_mode == MUSB_PORT_MODE_HOST;
#endif
}

--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/