linux-kernel - [PATCH] usb: gadget: zero: add function wakeup support

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Message-Id: <20250915090230.1280460-1-xu.yang_2@nxp.com>
Date: Mon, 15 Sep 2025 17:02:30 +0800
From: Xu Yang <xu.yang_2@....com>
To: gregkh@...uxfoundation.org,
	tglx@...utronix.de,
	mingo@...nel.org
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	jun.li@....com
Subject: [PATCH] usb: gadget: zero: add function wakeup support

When the device working at enhanced superspeed, it needs to send function
remote wakeup signal to the host instead of device remote wakeup. Add
function wakeup support for the purpose.

Signed-off-by: Xu Yang <xu.yang_2@....com>
---
 drivers/usb/gadget/legacy/zero.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/gadget/legacy/zero.c b/drivers/usb/gadget/legacy/zero.c
index a05785bdeb30..fe286b597f9f 100644
--- a/drivers/usb/gadget/legacy/zero.c
+++ b/drivers/usb/gadget/legacy/zero.c
@@ -147,6 +147,12 @@ static struct usb_gadget_strings *dev_strings[] = {
 	NULL,
 };
 
+static struct usb_function *func_lb;
+static struct usb_function_instance *func_inst_lb;
+
+static struct usb_function *func_ss;
+static struct usb_function_instance *func_inst_ss;
+
 /*-------------------------------------------------------------------------*/
 
 static struct timer_list	autoresume_timer;
@@ -156,6 +162,7 @@ static void zero_autoresume(struct timer_list *unused)
 {
 	struct usb_composite_dev	*cdev = autoresume_cdev;
 	struct usb_gadget		*g = cdev->gadget;
+	int status;
 
 	/* unconfigured devices can't issue wakeups */
 	if (!cdev->config)
@@ -165,10 +172,18 @@ static void zero_autoresume(struct timer_list *unused)
 	 * more significant than just a timer firing; likely
 	 * because of some direct user request.
 	 */
-	if (g->speed != USB_SPEED_UNKNOWN) {
-		int status = usb_gadget_wakeup(g);
-		INFO(cdev, "%s --> %d\n", __func__, status);
+	if (g->speed == USB_SPEED_UNKNOWN)
+		return;
+
+	if (g->speed >= USB_SPEED_SUPER) {
+		if (loopdefault)
+			status = usb_func_wakeup(func_lb);
+		else
+			status = usb_func_wakeup(func_ss);
+	} else {
+		status = usb_gadget_wakeup(g);
 	}
+	INFO(cdev, "%s --> %d\n", __func__, status);
 }
 
 static void zero_suspend(struct usb_composite_dev *cdev)
@@ -206,9 +221,6 @@ static struct usb_configuration loopback_driver = {
 	/* .iConfiguration = DYNAMIC */
 };
 
-static struct usb_function *func_ss;
-static struct usb_function_instance *func_inst_ss;
-
 static int ss_config_setup(struct usb_configuration *c,
 		const struct usb_ctrlrequest *ctrl)
 {
@@ -248,9 +260,6 @@ module_param_named(isoc_maxburst, gzero_options.isoc_maxburst, uint,
 		S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
 
-static struct usb_function *func_lb;
-static struct usb_function_instance *func_inst_lb;
-
 module_param_named(qlen, gzero_options.qlen, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(qlen, "depth of loopback queue");
 
-- 
2.34.1