This is a note to let you know that I've just added the patch titled
usb: common: usb-conn-gpio: Set last role to unknown before initial detection
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-common-usb-conn-gpio-set-last-role-to-unknown-be.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit eb8fc2a64847dbcfd11c88be40942375df3c5293
Author: Prashanth K <quic_prashk@xxxxxxxxxxx>
Date: Wed May 31 20:11:14 2023 +0530
usb: common: usb-conn-gpio: Set last role to unknown before initial detection
[ Upstream commit edd60d24bd858cef165274e4cd6cab43bdc58d15 ]
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, intel-xhci-usb-role-switch & musb/jz4740 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>
Message-ID: <1685544074-17337-1-git-send-email-quic_prashk@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index 8fe7420de033d..e5fe640b2bb01 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -243,6 +243,8 @@ static enum usb_role cdns3_hw_role_state_machine(struct cdns3 *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 c9545a4eff664..5754e467c16a8 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -276,6 +276,9 @@ static int usb_conn_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, info);
+ /* 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/drivers/usb/musb/jz4740.c b/drivers/usb/musb/jz4740.c
index c4fe1f4cd17a3..f283629091ec4 100644
--- a/drivers/usb/musb/jz4740.c
+++ b/drivers/usb/musb/jz4740.c
@@ -91,6 +91,8 @@ static int jz4740_musb_role_switch_set(struct usb_role_switch *sw,
case USB_ROLE_HOST:
atomic_notifier_call_chain(&phy->notifier, USB_EVENT_ID, phy);
break;
+ default:
+ break;
}
return 0;
diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c
index 5c96e929acea0..4d6a3dd06e011 100644
--- a/drivers/usb/roles/intel-xhci-usb-role-switch.c
+++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c
@@ -97,6 +97,8 @@ static int intel_xhci_usb_set_role(struct usb_role_switch *sw,
val |= SW_VBUS_VALID;
drd_config = DRD_CONFIG_STATIC_DEVICE;
break;
+ default:
+ break;
}
val |= SW_IDPIN_EN;
if (data->enable_sw_switch) {
diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index b9ccaeb8a4aef..aecfce46d3544 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -11,6 +11,7 @@ enum usb_role {
USB_ROLE_NONE,
USB_ROLE_HOST,
USB_ROLE_DEVICE,
+ USB_ROLE_UNKNOWN,
};
typedef int (*usb_role_switch_set_t)(struct usb_role_switch *sw,
