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.
While at it, also handle default case for the usb_role switch
in cdns3 to avoid build warnings.
Fixes: 4602f3bff266 ("usb: common: add USB GPIO based connection detection driver")
Signed-off-by: Prashanth K <quic_prashk@xxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
v5: Update commit text to mention the changes made in cdns3 driver.
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
