linux-kernel - Re: [PATCH] media/v4l2-ctrls: Always run s

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Date:	Tue, 17 Feb 2015 13:23:33 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
CC:	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Antti Palosaari <crope@....fi>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	linux-media <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media/v4l2-ctrls: Always run s_ctrl on volatile ctrls

On 02/17/15 13:21, Ricardo Ribalda Delgado wrote:
> Hello Hans
> 
> On Tue, Feb 17, 2015 at 1:03 PM, Hans Verkuil <hverkuil@...all.nl> wrote:
>> Should be done after the 'ctrl == NULL' check.
> 
> Good catch. Fixed on v2
> 
>>
>>>
>>>               if (ctrl == NULL)
>>>                       continue;
>>>
>>
>> There is one more change that has to be made: setting a volatile control
>> should never generate a V4L2_EVENT_CTRL_CH_VALUE event since that makes
>> no sense. The way to prevent that is to ensure that ctrl->has_changed is
>> always false for volatile controls. The new_to_cur function looks at that
>> field to decide whether to send an event.
>>
>> The documentation should also be updated: that of V4L2_CTRL_FLAG_VOLATILE
>> (in VIDIOC_QUERYCTRL), and of V4L2_EVENT_CTRL_CH_VALUE.
> 
> I can do this also if you want. It has been a while without
> contributing to media :)

Yes, please. I can't accept the patch without these other changes anyway :-)

Regards,

	Hans
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