linux-kernel - Re: [PATCH v2] usb: gadget: fsl_udc

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Date:	Tue, 29 Mar 2016 13:31:13 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Dmitry Osipenko <digetx@...il.com>, Li Yang <leoli@...escale.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: gadget: fsl_udc_core: Fix pullup status

Dmitry Osipenko <digetx@...il.com> writes:
> udc->softconnect should be set regardless of the VBUS state, otherwise
> the USB peripheral device, connected during suspend, won't be detected
> since can_pullup() would return false and the UDC won't be enabled.
>
> Fixes: 252455c40316 (usb: gadget: fsl driver pullup fix)
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
> Changelog:
> V2: "(is_on != 0)" changed to "!!is_on" as per Sergei Shtylyov comment,
>     cleaned up commit message.
>
>  drivers/usb/gadget/udc/fsl_udc_core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c b/drivers/usb/gadget/udc/fsl_udc_core.c
> index aab5221..4309b4f 100644
> --- a/drivers/usb/gadget/udc/fsl_udc_core.c
> +++ b/drivers/usb/gadget/udc/fsl_udc_core.c
> @@ -1220,10 +1220,11 @@ static int fsl_pullup(struct usb_gadget *gadget, int is_on)
>  
>  	udc = container_of(gadget, struct fsl_udc, gadget);
>  
> +	udc->softconnect = !!is_on;
> +
>  	if (!udc->vbus_active)
>  		return -EOPNOTSUPP;
>  
> -	udc->softconnect = (is_on != 0);

if we're suspended and VBUS was cut off, why would we keep softconnect
set to true ? That would also cause a discrepancy between SW state and
HW state.

I don't have this HW to test, but this patch seems wrong to me.

-- 
balbi

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