linux-kernel - Re: [RFC PATCH 4/5] media: ov6650: Fix frame scaling not reset on crop

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Date:   Fri, 31 May 2019 19:56:33 +0200
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Janusz Krzysztofik <jmkrzyszt@...il.com>
Subject: Re: [RFC PATCH 4/5] media: ov6650: Fix frame scaling not reset on crop

Hi Sakari,

On Friday, May 31, 2019 1:42:58 PM CEST Sakari Ailus wrote:
> Hi Janusz,
> 
> On Sun, May 26, 2019 at 10:47:57PM +0200, Janusz Krzysztofik wrote:
> > According to V4L2 subdevice interface specification, frame scaling
> > factors should be reset to default values on modification of input frame
> > format.  Assuming that requirement also applies in case of crop
> > rectangle modification unless V4L2_SEL_FLAG_KEEP_CONFIG is requested,
> > the driver now does not respect it.
> > 
> > The KEEP_CONFIG case is already implemented, fix the other path.
> > 
> > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
> > ---
> >  drivers/media/i2c/ov6650.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/media/i2c/ov6650.c b/drivers/media/i2c/ov6650.c
> > index 47590cd51190..cc70d8952999 100644
> > --- a/drivers/media/i2c/ov6650.c
> > +++ b/drivers/media/i2c/ov6650.c
> > @@ -472,6 +472,8 @@ static int ov6650_get_selection(struct v4l2_subdev 
*sd,
> >  	}
> >  }
> >  
> > +static int ov6650_s_fmt(struct v4l2_subdev *sd, u32 code, bool 
half_scale);
> > +
> 
> Would it be possible to rearrange the functions in the file so you wouldn't
> need extra prototypes? Preferrably that'd be a new patch.

Sure. I've intentionally done it like that for better readability of the 
patches, but I have a task in my queue for rearrangement of functions order as 
soon as other modifications are in place.

> >  static int ov6650_set_selection(struct v4l2_subdev *sd,
> >  		struct v4l2_subdev_pad_config *cfg,
> >  		struct v4l2_subdev_selection *sel)
> > @@ -515,7 +517,13 @@ static int ov6650_set_selection(struct v4l2_subdev 
*sd,
> >  	}
> >  	if (!ret)
> >  		priv->rect.height = sel->r.height;
> > +	else
> > +		return ret;
> 
> if (ret)
> 	return ret;

OK

Perhaps you will have more comments on other patches so I'll wait a bit and 
then resubmit the series as v2.

Thanks,
Janusz

> ...
> 
> >  
> > +	if (priv->half_scale) {
> > +		/* turn off half scaling, preserve media bus format */
> > +		ret = ov6650_s_fmt(sd, priv->code, false);
> > +	}
> >  	return ret;
> >  }
> >  
> 
>