linux-kernel - [PATCH] usb:gadget:uvc: Add super speed plus descriptors

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Message-ID: <4ca94f99-fe07-49c2-adc7-84df519792f5@google.com>
Date:   Thu, 19 Oct 2023 15:39:44 -0700
From:   Jayant Chowdhary <jchowdhary@...gle.com>
To:     "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>, balbi@...nel.org,
        Greg KH <gregkh@...uxfoundation.org>,
        "kieran.bingham@...asonboard.com" <kieran.bingham@...asonboard.com>
Cc:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        "arakesh@...gle.com" <arakesh@...gle.com>,
        "etalvala@...gle.com" <etalvala@...gle.com>
Subject: [PATCH] usb:gadget:uvc: Add super speed plus descriptors

Currently the UVC gadget driver doesn't support super speed
plus connections since it doesn't advertise super speed plus descriptors.
This patch re-uses the super speed descriptors for super-speed plus.
As a result, hosts can recognize gadget devices when using a super
speed plus connection.

Signed-off-by: Jayant Chowdhary <jchowdhary@...gle.com>
---
 drivers/usb/gadget/function/f_uvc.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 32f2c1645467..fa96306f2209 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -492,6 +492,7 @@ 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;
@@ -536,7 +537,7 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 	      + uvc_control_ep.bLength + uvc_control_cs_ep.bLength
 	      + uvc_streaming_intf_alt0.bLength;
 
-	if (speed == USB_SPEED_SUPER) {
+	if (speed == USB_SPEED_SUPER || speed == USB_SPEED_SUPER_PLUS) {
 		bytes += uvc_ss_control_comp.bLength;
 		n_desc = 6;
 	} else {
@@ -580,7 +581,7 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 	uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
 
 	UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
-	if (speed == USB_SPEED_SUPER)
+	if (speed == USB_SPEED_SUPER || speed == USB_SPEED_SUPER_PLUS)
 		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp);
 
 	UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
@@ -742,7 +743,14 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
 			goto error;
 		}
 	}
-
+	if (gadget_is_superspeed_plus(c->cdev->gadget)) {
+		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);
--