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

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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
This commit is contained in:
Macpaul Lin 2020-05-24 21:50:47 -05:00 committed by Greg Kroah-Hartman
parent b6aceb5a3e
commit 42c433c5f7
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/musb/mediatek.c
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@ -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);