linux-kernel - Re: [PATCH] usb: musb: mediatek: add reset FADDR to zero in reset interrupt handle

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Date:   Thu, 14 May 2020 15:33:25 +0800
From:   Min Guo <min.guo@...iatek.com>
To:     Macpaul Lin <macpaul.lin@...iatek.com>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Hans de Goede <hdegoede@...hat.com>, Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
        Macpaul Lin <macpaul.lin@...il.com>
Subject: Re: [PATCH] usb: musb: mediatek: add reset FADDR to zero in reset
 interrupt handle

On Thu, 2020-05-14 at 12:01 +0800, Macpaul Lin wrote:
> 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@...iatek.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 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);
>  

Acked-by:Min Guo <min.guo@...iatek.com>