linux-kernel - Re: [PATCH v4 3/3] usb: chipidea: register driver as a peripheral with the phy

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Date:	Mon, 23 Nov 2015 16:29:30 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Tim Bird <tim.bird@...ymobile.com>
CC:	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<gregkh@...uxfoundation.org>, <balbi@...com>,
	<Bjorn.Andersson@...ymobile.com>, <linux-usb@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <tbird20d@...il.com>
Subject: Re: [PATCH v4 3/3] usb: chipidea: register driver as a peripheral
 with the phy

On Fri, Nov 20, 2015 at 03:47:20PM -0800, Tim Bird wrote:
> Register the chipidea driver with the phy, so that the phy
> driver can kick the gadget driver when it resumes from low power.
> The phy-msm-usb (Qualcomm) driver requires this in order to
> recover gadget operation after you disconnect the USB cable
> and reconnect it.
> 
> Signed-off-by: Tim Bird <tim.bird@...ymobile.com>
> ---
>  drivers/usb/chipidea/udc.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index 8223fe7..06234cd 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -1890,6 +1890,12 @@ static int udc_start(struct ci_hdrc *ci)
>  
>  	ci->gadget.ep0 = &ci->ep0in->ep;
>  
> +	if (ci->usb_phy) {
> +		retval = otg_set_peripheral(ci->usb_phy->otg, &ci->gadget);
> +		if (retval)
> +			goto destroy_eps;
> +	}
> +
>  	retval = usb_add_gadget_udc(dev, &ci->gadget);
>  	if (retval)
>  		goto destroy_eps;

Hi Tim,

I am afraid it can't work for current chipidea framework (find this
problem after testing), the chipidea core manages its host and device
function using its own API start/stop, it does not define struct usb_otg
APIs. In fact, it is not reasonable control host and device function
at PHY driver.

-- 

Best Regards,
Peter Chen
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