Re: [PATCH 4/6] usb: musb: mediatek: add reset FADDR to zero in reset interrupt handle

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Jun 17, 2020 at 04:17:07PM +0800, Macpaul Lin wrote:
> Bin Liu <b-liu@ti.com> 於 2020年5月25日 週一 上午10:53寫道：
> >
> > From: Macpaul Lin <macpaul.lin@mediatek.com>
> >
> > When receiving reset interrupt, FADDR need to be reset to zero in
> > peripheral mode. Otherwise ep0 cannot do enumeration when re-plugging USB
> > cable.
> >
> > 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>
> > ---
> >  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 6196b0e8d77d..eebeadd26946 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);
> >
> > --
> > 2.17.1
> >
> Could this bug fix also been applied to stable kernel?

Sure, what is the git commit of it in Linus's tree?

thanks,

greg k-h