linux-kernel - Re: [PATCH] usb: chipidea: udc: clear vbus_active flag in udc

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Date:	Tue, 20 Oct 2015 14:01:08 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Jiada Wang <jiada_wang@...tor.com>
CC:	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: chipidea: udc: clear vbus_active flag in udc_stop

On Tue, Oct 20, 2015 at 11:29:18AM +0900, Jiada Wang wrote:
> Currently in udc_stop, if vbus_active flag is true, all USB activities
> will be stopped, but vbus_active flag is still left to be true,
> this causes issue, when afterwards driver tries to connect gadget
> device to host, But due to the uncleared vbus_active, some necessary
> setup steps are skipped.
> 
> This patch clears vbus_active flag in udc_stop callback.
> 
> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
> ---
>  drivers/usb/chipidea/udc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index 8223fe7..b9ac228 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -1762,6 +1762,7 @@ static int ci_udc_stop(struct usb_gadget *gadget)
>  	spin_lock_irqsave(&ci->lock, flags);
>  
>  	if (ci->vbus_active) {
> +		ci->vbus_active = 0;
>  		hw_device_state(ci, 0);
>  		if (ci->platdata->notify_event)
>  			ci->platdata->notify_event(ci,
> -- 
> 2.4.5
> 

This flag will be handled by vbus interrupt, would you please explain
more what problem you have met?

-- 

Best Regards,
Peter Chen
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