Bin Liu <b-liu@xxxxxx> 於 2020年5月25日 週一 上午10:53寫道：
>
> From: Macpaul Lin <macpaul.lin@xxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxx>
> Acked-by: Min Guo <min.guo@xxxxxxxxxxxx>
> Signed-off-by: Bin Liu <b-liu@xxxxxx>
> ---
> 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?
Thanks!
Best regards,
Macpaul Lin
