linux-kernel - Re: [PATCH 2/2] usb: gadget: uvc: Set the vb2 queue timestamp flags

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Message-ID: <5335380F.9070809@xs4all.nl>
Date:	Fri, 28 Mar 2014 09:51:27 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org
CC:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Roland Scheidegger <rscheidegger_lists@...peed.ch>
Subject: Re: [PATCH 2/2] usb: gadget: uvc: Set the vb2 queue timestamp flags

On 03/23/2014 04:32 PM, Laurent Pinchart wrote:
> The vb2 queue timestamp_flags field must be set by drivers, as enforced
> by a WARN_ON in vb2_queue_init. The UVC gadget driver failed to do so.
> This resulted in the following warning.
> 
> [    2.104371] g_webcam gadget: uvc_function_bind
> [    2.105567] ------------[ cut here ]------------
> [    2.105567] ------------[ cut here ]------------
> [    2.106779] WARNING: CPU: 0 PID: 1 at drivers/media/v4l2-core/videobuf2-core.c:2207 vb2_queue_init+0xa3/0x113()
> 
> Fix it.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Reviewed-by: Hans Verkuil <hans.verkuil@...co.com>

Regards,

	Hans

> ---
>  drivers/usb/gadget/uvc_queue.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/gadget/uvc_queue.c b/drivers/usb/gadget/uvc_queue.c
> index d4561ba..4611e9c 100644
> --- a/drivers/usb/gadget/uvc_queue.c
> +++ b/drivers/usb/gadget/uvc_queue.c
> @@ -136,6 +136,8 @@ static int uvc_queue_init(struct uvc_video_queue *queue,
>  	queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
>  	queue->queue.ops = &uvc_queue_qops;
>  	queue->queue.mem_ops = &vb2_vmalloc_memops;
> +	queue->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
> +				     | V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
>  	ret = vb2_queue_init(&queue->queue);
>  	if (ret)
>  		return ret;
> 

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