linux-kernel - [PATCH v2] usb: common: usb-conn-gpio: Set last role to unknown before initial detection

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Message-ID: <1684936207-23529-1-git-send-email-quic_prashk@quicinc.com>
Date:   Wed, 24 May 2023 19:20:07 +0530
From:   Prashanth K <quic_prashk@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Prashanth K <quic_prashk@...cinc.com>
Subject: [PATCH v2] usb: common: usb-conn-gpio: Set last role to unknown before initial detection

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

To avoid this, added a new constant in enum usb_role, last_role
is set to USB_ROLE_UNKNOWN before performing initial detection.

Fixes: 4602f3bff266 ("usb: common: add USB GPIO based connection detection driver")
Signed-off-by: Prashanth K <quic_prashk@...cinc.com>
---
v2: Added USB_ROLE_UNKNWON to enum usb_role

 drivers/usb/common/usb-conn-gpio.c | 3 +++
 include/linux/usb/role.h           | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index e20874c..30bdb81 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -257,6 +257,9 @@ static int usb_conn_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, info);
 	device_set_wakeup_capable(&pdev->dev, true);
 
+	/* Set last role to unknown before performing the initial detection */
+	info->last_role = USB_ROLE_UNKNOWN;
+
 	/* Perform initial detection */
 	usb_conn_queue_dwork(info, 0);
 
diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index b5deafd..221d462 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -8,6 +8,7 @@
 struct usb_role_switch;
 
 enum usb_role {
+	USB_ROLE_UNKNOWN = -1,
 	USB_ROLE_NONE,
 	USB_ROLE_HOST,
 	USB_ROLE_DEVICE,
-- 
2.7.4