linux-kernel - [PATCH v2] usb: gadget: uvc: Add missing initialization of ssp config descriptor

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Message-ID: <20231027183440.1994315-1-shuzhenwang@google.com>
Date:   Fri, 27 Oct 2023 11:34:40 -0700
From:   Shuzhen Wang <shuzhenwang@...gle.com>
To:     shuzhenwang@...gle.com, gregkh@...uxfoundation.org
Cc:     balbi@...nel.org, laurent.pinchart@...asonboard.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH v2] usb: gadget: uvc: Add missing initialization of ssp config descriptor

In case the uvc gadget is super speed plus, the corresponding config
descriptor wasn't initialized. As a result, the host will not recognize
the devices when using super speed plus connection.

This patch initializes them to super speed descriptors.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Shuzhen Wang <shuzhenwang@...gle.com>
---
 v2: fix patch formatting

 drivers/usb/gadget/function/f_uvc.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index faa398109431..786379f1b7b7 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -516,6 +516,7 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 	void *mem;
 
 	switch (speed) {
+	case USB_SPEED_SUPER_PLUS:
 	case USB_SPEED_SUPER:
 		uvc_control_desc = uvc->desc.ss_control;
 		uvc_streaming_cls = uvc->desc.ss_streaming;
@@ -564,7 +565,8 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 		bytes += uvc_interrupt_ep.bLength + uvc_interrupt_cs_ep.bLength;
 		n_desc += 2;
 
-		if (speed == USB_SPEED_SUPER) {
+		if (speed == USB_SPEED_SUPER ||
+		    speed == USB_SPEED_SUPER_PLUS) {
 			bytes += uvc_ss_interrupt_comp.bLength;
 			n_desc += 1;
 		}
@@ -619,7 +621,8 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 
 	if (uvc->enable_interrupt_ep) {
 		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_interrupt_ep);
-		if (speed == USB_SPEED_SUPER)
+		if (speed == USB_SPEED_SUPER ||
+		    speed == USB_SPEED_SUPER_PLUS)
 			UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_interrupt_comp);
 
 		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_interrupt_cs_ep);
@@ -795,6 +798,13 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
 		goto error;
 	}
 
+	f->ssp_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER_PLUS);
+	if (IS_ERR(f->ssp_descriptors)) {
+		ret = PTR_ERR(f->ssp_descriptors);
+		f->ssp_descriptors = NULL;
+		goto error;
+	}
+
 	/* Preallocate control endpoint request. */
 	uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
 	uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
-- 
2.42.0.820.g83a721a137-goog