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

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Date:   Fri, 27 Oct 2023 11:03:15 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Shuzhen Wang <shuzhenwang@...gle.com>
Cc:     balbi@...nel.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: uvc: Add missing initialization of ssp
 config descriptor

Hi Shuzhen,

Thank you for the patch.

On Thu, Oct 26, 2023 at 12:29:02PM -0700, Shuzhen Wang wrote:
> 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.
> 
> Signed-off-by: Shuzhen Wang <shuzhenwang@...gle.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>   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);

-- 
Regards,

Laurent Pinchart