linux-kernel - Re: [PATCH 1/3] usb: dwc3: gadget: Introduce a DWC3 VBUS draw callback

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Date:   Mon, 16 Nov 2020 13:43:25 +0000
From:   Peter Chen <peter.chen@....com>
To:     Wesley Cheng <wcheng@...eaurora.org>
CC:     "balbi@...nel.org" <balbi@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "jackp@...eaurora.org" <jackp@...eaurora.org>
Subject: Re: [PATCH 1/3] usb: dwc3: gadget: Introduce a DWC3 VBUS draw
 callback

On 20-11-14 00:12:45, Wesley Cheng wrote:
> Some devices support charging while in device mode.  In these situations,
> the USB gadget will notify the DWC3 gadget driver to modify the current
> based on the enumeration and device state.  The usb_phy_set_power() API
> will allow external charger entities to adjust the charge current through
> the notifier block.
> 
> Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
> ---
>  drivers/usb/dwc3/gadget.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index c145da1d8ba5..69122f66978e 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2387,6 +2387,16 @@ static void dwc3_gadget_set_speed(struct usb_gadget *g,
>  	spin_unlock_irqrestore(&dwc->lock, flags);
>  }
>  
> +static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
> +{
> +	struct dwc3		*dwc = gadget_to_dwc(g);
> +
> +	if (dwc->usb2_phy)
> +		return usb_phy_set_power(dwc->usb2_phy, mA);
> +
> +	return 0;
> +}
> +
>  static const struct usb_gadget_ops dwc3_gadget_ops = {
>  	.get_frame		= dwc3_gadget_get_frame,
>  	.wakeup			= dwc3_gadget_wakeup,
> @@ -2396,6 +2406,7 @@ static const struct usb_gadget_ops dwc3_gadget_ops = {
>  	.udc_stop		= dwc3_gadget_stop,
>  	.udc_set_speed		= dwc3_gadget_set_speed,
>  	.get_config_params	= dwc3_gadget_config_params,
> +	.vbus_draw		= dwc3_gadget_vbus_draw,
>  };
>  

Reviewed-by: Peter Chen <peter.chen@....com>

-- 

Thanks,
Peter Chen