usb: phy: mxs: disconnect line when USB charger is attached

For mxs PHY, if there is a vbus but the bus is not enumerated, we need
to force the dp/dm as SE0 from the controller side. If not, there is
possible USB wakeup due to unstable dp/dm, since there is possible no
pull on dp/dm, such as there is a USB charger on the port.

Signed-off-by: Xu Yang <[email protected]>
Acked-by: Peter Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Xu Yang

drivers/usb/phy/phy-mxs-usb.c

@@ -395,6 +395,7 @@ static bool mxs_phy_is_otg_host(struct mxs_phy *mxs_phy)
 static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on)
 {
 	bool vbus_is_on = false;
+	enum usb_phy_events last_event = mxs_phy->phy.last_event;
 
 	/* If the SoCs don't need to disconnect line without vbus, quit */
 	if (!(mxs_phy->data->flags & MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS))
@@ -406,7 +407,8 @@ static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on)
 
 	vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);
 
-	if (on && !vbus_is_on && !mxs_phy_is_otg_host(mxs_phy))
+	if (on && ((!vbus_is_on && !mxs_phy_is_otg_host(mxs_phy))
+		|| (last_event == USB_EVENT_VBUS)))
 		__mxs_phy_disconnect_line(mxs_phy, true);
 	else
 		__mxs_phy_disconnect_line(mxs_phy, false);