[PATCH] usb: musb: mediatek: add reset FADDR to zero in reset interrupt handle

[Macpaul Lin]

When receiving reset interrupt, FADDR need to be reset to zero in
periphearl mode. Otherwise ep0 cannot do enumeration when re-pluging USB
cable.

Signed-off-by: Macpaul Lin <macpaul.lin@xxxxxxxxxxxx>
---
 drivers/usb/musb/mediatek.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c
index 6196b0e..eebeadd 100644
--- a/drivers/usb/musb/mediatek.c
+++ b/drivers/usb/musb/mediatek.c
@@ -208,6 +208,12 @@ static irqreturn_t generic_interrupt(int irq, void *__hci)
 	musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
 	musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);
 
+	if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
+		/* ep0 FADDR must be 0 when (re)entering peripheral mode */
+		musb_ep_select(musb->mregs, 0);
+		musb_writeb(musb->mregs, MUSB_FADDR, 0);
+	}
+
 	if (musb->int_usb || musb->int_tx || musb->int_rx)
 		retval = musb_interrupt(musb);
 
-- 
1.7.9.5