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

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Date:   Sun, 14 Mar 2021 09:46:29 +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 2/2] usb: webcam: Invalid size of Processing Unit
 Descriptor

On 21-03-08 11:27:35, 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.

Does the reason forget filling bmVideoStandards entry?

Peter
> 
> 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.
> 
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  include/uapi/linux/usb/video.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/uapi/linux/usb/video.h b/include/uapi/linux/usb/video.h
> index d854cb19c42c..2a54e8fdd341 100644
> --- a/include/uapi/linux/usb/video.h
> +++ b/include/uapi/linux/usb/video.h
> @@ -302,6 +302,7 @@ 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))
> -- 
> 2.25.1
> 

-- 

Thanks,
Peter Chen