linux-kernel - Re: [PATCH v7 08/10] media: i2c: ov9282: add strobe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <pr42kk7pxmj7p5sdakgqgu5f2kacifublyjn5cp3nkfjqivub7@czcsi2da6nmi>
Date: Mon, 8 Sep 2025 13:38:42 +0200
From: Richard Leitner <richard.leitner@...ux.dev>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	Dave Stevenson <dave.stevenson@...pberrypi.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, 
	Lee Jones <lee@...nel.org>, Pavel Machek <pavel@...nel.org>, linux-media@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org, Hans Verkuil <hverkuil@...nel.org>
Subject: Re: [PATCH v7 08/10] media: i2c: ov9282: add strobe_source v4l2
 control

Hi Laurent,

thanks for your feedback!

On Sun, Sep 07, 2025 at 10:20:49PM +0200, Laurent Pinchart wrote:
> Hi Richard,
> 
> Thank you for the patch.
> 
> On Mon, Sep 01, 2025 at 05:05:13PM +0200, Richard Leitner wrote:
> > Add read-only V4L2_CID_FLASH_STROBE_SOURCE control. Its value is fixed
> > to V4L2_FLASH_STROBE_SOURCE_EXTERNAL as the camera sensor triggers the
> > strobe based on its register settings.
> 
> I don't think you should implement this control in the sensor driver. It
> should only be implemented in the flash controller driver to select the
> source.

Totally true. This was introduced in the first version of this series to
enable the flash output. Now as we have V4L2_CID_FLASH_STROBE_SOURCE (or
however it will be named finally) this, for no reason, became a read-only
property. This shouldn't be there at all.

Thanks for the catch. I will remove it from the series!

> 
> > Signed-off-by: Richard Leitner <richard.leitner@...ux.dev>
> > ---
> >  drivers/media/i2c/ov9282.c | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
> > index c405e3411daf37cf98d5af3535702f8321394af5..9efc82a1929a76c6fb245e7dbfb5276a133d1c5d 100644
> > --- a/drivers/media/i2c/ov9282.c
> > +++ b/drivers/media/i2c/ov9282.c
> > @@ -1368,11 +1368,12 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
> >  	struct v4l2_ctrl_handler *ctrl_hdlr = &ov9282->ctrl_handler;
> >  	const struct ov9282_mode *mode = ov9282->cur_mode;
> >  	struct v4l2_fwnode_device_properties props;
> > +	struct v4l2_ctrl *ctrl;
> >  	u32 hblank_min;
> >  	u32 lpfr;
> >  	int ret;
> >  
> > -	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 12);
> > +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 13);
> >  	if (ret)
> >  		return ret;
> >  
> > @@ -1443,6 +1444,14 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
> >  	v4l2_ctrl_new_std(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_DURATION,
> >  			  0, 13900, 1, 8);
> >  
> > +	ctrl = v4l2_ctrl_new_std_menu(ctrl_hdlr, &ov9282_ctrl_ops,
> > +				      V4L2_CID_FLASH_STROBE_SOURCE,
> > +				      V4L2_FLASH_STROBE_SOURCE_EXTERNAL,
> > +				      ~(1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL),
> > +				      V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
> > +	if (ctrl)
> > +		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> >  	ret = v4l2_fwnode_device_parse(ov9282->dev, &props);
> >  	if (!ret) {
> >  		/* Failure sets ctrl_hdlr->error, which we check afterwards anyway */
> 
> -- 
> Regards,
> 
> Laurent Pinchart

thanks again!

regards;rl