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From: Ricardo Ribalda Delgado <>
To: Laurent Pinchart <>
Cc: Hans Verkuil <>,
	Mauro Carvalho Chehab <>,
	Hans Verkuil <>,
	Sylwester Nawrocki <>,
	Sakari Ailus <>,
	Antti Palosaari <>,
	linux-media <>,
	LKML <>
Subject: Re: [PATCH v4 1/2] media/v4l2-ctrls: Always run s_ctrl on volatile ctrls
Date: Mon, 9 Mar 2015 17:45:19 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <1805679.hlRzVeq61B@avalon>


Back from holidays and back to this issue. Sorry for the delay.

> I'm not sure about Ricardo's use case, is it the one we've discussed on #v4l ?
> If so, and if I recall correctly, the idea was to perform an action with a
> parameter, and didn't require volatility.

In my case, there is a trigger overflow bit. The user acks the trigger
overflow by writting any value to the control.

There is no parameter. In that sense it looks like a volatile read + a
button on a controll.

> Your proposal is interesting as well, but I'm not sure about the
> V4L2_CTRL_FLAG_ACTION name. Aren't all controls supposed to have an action of
> some sort ? That's nitpicking of course.

What about the name STATELESS_WRITE ? or perhaps VOLATILE_WRITE? I
dont care about the name :), but better have it solved before I write
the doc :P

> Also, should the action flag be automatically set for button controls ? Button
> controls would in a way become type-less controls with the action flag set,
> that's interesting. I suppose type-less controls without the action flag don't
> make sense.

I agree!

Best regards and thanks!

Ricardo Ribalda

  parent reply	other threads:[~2015-03-09 16:45 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-17 15:08 Ricardo Ribalda Delgado
2015-02-23  9:06 ` Hans Verkuil
2015-02-23 23:07   ` Laurent Pinchart
2015-02-24  1:04     ` Ricardo Ribalda Delgado
2015-03-09 16:45     ` Ricardo Ribalda Delgado [this message]
2015-03-16 11:05       ` Hans Verkuil

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