usb: dwc3: Try usb-role-switch first in dwc3_drd_init

If the PHY controller node has a "port" dwc3 tries to find an
extcon device even when "usb-role-switch" is present. This happens
because dwc3_get_extcon() sees that "port" node and then calls
extcon_find_edev_by_node() which will always return EPROBE_DEFER
in that case.

On the other hand, even if an extcon was present and dwc3_get_extcon()
was successful it would still be ignored in favor of "usb-role-switch".

Let's just first check if "usb-role-switch" is configured in the device
tree and directly use it instead and only try to look for an extcon
device otherwise.

Fixes: 8a0a13799744 ("usb: dwc3: Registering a role switch in the DRD code.")
Cc: stable <stable@kernel.org>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20220411155300.9766-1-sven@svenpeter.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index b60b5f7..8cad9e7 100644 (file)
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -584,16 +584,15 @@ int dwc3_drd_init(struct dwc3 *dwc)
 {
        int ret, irq;
 
+       if (ROLE_SWITCH &&
+           device_property_read_bool(dwc->dev, "usb-role-switch"))
+               return dwc3_setup_role_switch(dwc);
+
        dwc->edev = dwc3_get_extcon(dwc);
        if (IS_ERR(dwc->edev))
                return PTR_ERR(dwc->edev);
 
-       if (ROLE_SWITCH &&
-           device_property_read_bool(dwc->dev, "usb-role-switch")) {
-               ret = dwc3_setup_role_switch(dwc);
-               if (ret < 0)
-                       return ret;
-       } else if (dwc->edev) {
+       if (dwc->edev) {
                dwc->edev_nb.notifier_call = dwc3_drd_notifier;
                ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
                                               &dwc->edev_nb);