Commit 42c433c5 authored May 24, 2020 by Macpaul Lin Committed by Greg Kroah-Hartman Jul 02, 2020

UPSTREAM: usb: musb: mediatek: add reset FADDR to zero in reset interrupt handle



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

Bug: 158724613
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Acked-by: Min Guo <min.guo@mediatek.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200525025049.3400-5-b-liu@ti.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 402bcac4b25b520c89ba60db85eb6316f36e797f)
Change-Id: I95ec2486aee1cd4db56f49138cbd781c099fa488

parent b6aceb5a

drivers/usb/musb/mediatek.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -203,6 +203,12 @@ 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);