linux-kernel - Re: [PATCH v4 2/2] usb: webcam: Invalid size of Processing Unit Descriptor

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Message-ID: <20210316002549.GB15335@b29397-desktop>
Date:   Tue, 16 Mar 2021 08:25:49 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     balbi@...nel.org, gregkh@...uxfoundation.org,
        linux-api@...r.kernel.org, laurent.pinchart@...asonboard.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        kurahul@...ence.com
Subject: Re: [PATCH v4 2/2] usb: webcam: Invalid size of Processing Unit
 Descriptor

On 21-03-15 08:17:48, Pawel Laszczak wrote:
> From: Pawel Laszczak <pawell@...ence.com>
> 
> According with USB Device Class Definition for Video Device the
> Processing Unit Descriptor bLength should be 12 (10 + bmControlSize),
> but it has 11.
> 
> Invalid length caused that Processing Unit Descriptor Test Video form
> CV tool failed. To fix this issue patch adds bmVideoStandards into
> uvc_processing_unit_descriptor structure.
> 
> The bmVideoStandards field was added in UVC 1.1 and it wasn't part of
> UVC 1.0a.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> 

Reviewed-by: Peter Chen <peter.chen@...nel.org>

> ---
> Changelog:
> v4:
> - fixed compilation error caused by v2
> v3:
> - updated the commit message
> - added bmVideoStandard field to UVC gadget driver
> v2:
> - updated UVC_DT_PROCESSING_UNIT_SIZE macro
> 
>  drivers/usb/gadget/function/f_uvc.c | 1 +
>  drivers/usb/gadget/legacy/webcam.c  | 1 +
>  include/uapi/linux/usb/video.h      | 3 ++-
>  3 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
> index 5d62720bb9e1..e3b0a79c8f01 100644
> --- a/drivers/usb/gadget/function/f_uvc.c
> +++ b/drivers/usb/gadget/function/f_uvc.c
> @@ -823,6 +823,7 @@ static struct usb_function_instance *uvc_alloc_inst(void)
>  	pd->bmControls[0]		= 1;
>  	pd->bmControls[1]		= 0;
>  	pd->iProcessing			= 0;
> +	pd->bmVideoStandards		= 0;
>  
>  	od = &opts->uvc_output_terminal;
>  	od->bLength			= UVC_DT_OUTPUT_TERMINAL_SIZE;
> diff --git a/drivers/usb/gadget/legacy/webcam.c b/drivers/usb/gadget/legacy/webcam.c
> index 3a61de4bb2b1..accb4dacf715 100644
> --- a/drivers/usb/gadget/legacy/webcam.c
> +++ b/drivers/usb/gadget/legacy/webcam.c
> @@ -125,6 +125,7 @@ static const struct uvc_processing_unit_descriptor uvc_processing = {
>  	.bmControls[0]		= 1,
>  	.bmControls[1]		= 0,
>  	.iProcessing		= 0,
> +	.bmVideoStandards	= 0,
>  };
>  
>  static const struct uvc_output_terminal_descriptor uvc_output_terminal = {
> diff --git a/include/uapi/linux/usb/video.h b/include/uapi/linux/usb/video.h
> index d854cb19c42c..bfdae12cdacf 100644
> --- a/include/uapi/linux/usb/video.h
> +++ b/include/uapi/linux/usb/video.h
> @@ -302,9 +302,10 @@ struct uvc_processing_unit_descriptor {
>  	__u8   bControlSize;
>  	__u8   bmControls[2];
>  	__u8   iProcessing;
> +	__u8   bmVideoStandards;
>  } __attribute__((__packed__));
>  
> -#define UVC_DT_PROCESSING_UNIT_SIZE(n)			(9+(n))
> +#define UVC_DT_PROCESSING_UNIT_SIZE(n)			(10+(n))
>  
>  /* 3.7.2.6. Extension Unit Descriptor */
>  struct uvc_extension_unit_descriptor {
> -- 
> 2.25.1
> 

-- 

Thanks,
Peter Chen