usb: common: usb-conn-gpio: Prevent bailing out if initial role is none

Currently if we bootup a device without cable connected, then
usb-conn-gpio won't call set_role() because last_role is same
as current role. This happens since last_role gets initialised
to zero during the probe.

To avoid this, add a new flag initial_detection into struct
usb_conn_info, which prevents bailing out during initial
detection.

Cc: <stable@vger.kernel.org> # 5.4
Fixes: 4602f3bff266 ("usb: common: add USB GPIO based connection detection driver")
Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/1690880632-12588-1-git-send-email-quic_prashk@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index 766005d..501e8bc 100644 (file)
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -42,6 +42,7 @@ struct usb_conn_info {
 
        struct power_supply_desc desc;
        struct power_supply *charger;
+       bool initial_detection;
 };
 
 /*
@@ -86,11 +87,13 @@ static void usb_conn_detect_cable(struct work_struct *work)
        dev_dbg(info->dev, "role %s -> %s, gpios: id %d, vbus %d\n",
                usb_role_string(info->last_role), usb_role_string(role), id, vbus);
 
-       if (info->last_role == role) {
+       if (!info->initial_detection && info->last_role == role) {
                dev_warn(info->dev, "repeated role: %s\n", usb_role_string(role));
                return;
        }
 
+       info->initial_detection = false;
+
        if (info->last_role == USB_ROLE_HOST && info->vbus)
                regulator_disable(info->vbus);
 
@@ -258,6 +261,7 @@ static int usb_conn_probe(struct platform_device *pdev)
        device_set_wakeup_capable(&pdev->dev, true);
 
        /* Perform initial detection */
+       info->initial_detection = true;
        usb_conn_queue_dwork(info, 0);
 
        return 0;