usb: dwc3: add an alternate path in vbus_draw callback

This patch adds an alternate path in vbus_draw callback through
power supply property POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT.

Signed-off-by: Ray Chi <raychi@google.com>
Link: https://lore.kernel.org/r/20210222115149.3606776-3-raychi@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index aebcf8e..4780983 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2530,11 +2530,19 @@ static void dwc3_gadget_set_ssp_rate(struct usb_gadget *g,
 static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
 {
        struct dwc3             *dwc = gadget_to_dwc(g);
+       union power_supply_propval      val = {0};
+       int                             ret;
 
        if (dwc->usb2_phy)
                return usb_phy_set_power(dwc->usb2_phy, mA);
 
-       return 0;
+       if (!dwc->usb_psy)
+               return -EOPNOTSUPP;
+
+       val.intval = mA;
+       ret = power_supply_set_property(dwc->usb_psy, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
+
+       return ret;
 }
 
 static const struct usb_gadget_ops dwc3_gadget_ops = {