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Message-ID: <1685004264-28368-1-git-send-email-quic_prashk@quicinc.com>
Date: Thu, 25 May 2023 14:14:24 +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 v4] 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
initialised 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>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
v4: Added Reviewed-by tag.
v3: Added a default case in drivers/usb/cdns3/core.c as pointed out by
the test robot.
v2: Added USB_ROLE_UNKNWON to enum usb_role.
drivers/usb/cdns3/core.c | 2 ++
drivers/usb/common/usb-conn-gpio.c | 3 +++
include/linux/usb/role.h | 1 +
3 files changed, 6 insertions(+)
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index dbcdf3b..69d2921 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -252,6 +252,8 @@ static enum usb_role cdns_hw_role_state_machine(struct cdns *cdns)
if (!vbus)
role = USB_ROLE_NONE;
break;
+ default:
+ break;
}
dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
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
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