linux-kernel - Re: [PATCH 1/3] media: imx274: don't declare events, they are not implemented

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Message-ID: <20181127091914.zai73kgmam7oi33m@valkosipuli.retiisi.org.uk>
Date:   Tue, 27 Nov 2018 11:19:14 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Luca Ceresoli <luca@...aceresoli.net>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media@...r.kernel.org, Leon Luo <leonl@...pardimaging.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] media: imx274: don't declare events, they are not
 implemented

On Tue, Nov 27, 2018 at 10:09:08AM +0100, Luca Ceresoli wrote:
> Hi Sakari,
> 
> On 27/11/18 09:38, Sakari Ailus wrote:
> > Hi Luca,
> > 
> > On Tue, Nov 27, 2018 at 09:34:43AM +0100, Luca Ceresoli wrote:
> >> The V4L2_SUBDEV_FL_HAS_EVENTS flag should not be set, event are just
> >> not implemented.
> >>
> >> Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
> > 
> > The driver supports controls, and so control events can be subscribed and
> > received by the user. Therefore I don't see a reason to remove the flag.

I further missed the driver does not set the event (un)subscription
callbacks; the event support is actually not functional as a result. :-\

It's trivial to do that, see e.g. the imx319 driver.

> 
> Thanks, good to know.
> 
> Would it be worth adding a note where V4L2_SUBDEV_FL_HAS_EVENTS is
> #defined, to make this clear?

Could you send a patch? A few words should be enough, no need for a too
elaborate description I guess.

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@....fi