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Date:   Tue, 8 Feb 2022 18:05:12 +0200
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Cc:     dave.stevenson@raspberrypi.com, devicetree@vger.kernel.org,
        kernel-list@raspberrypi.com, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
        linux-rpi-kernel@lists.infradead.org, lukasz@jany.st,
        mchehab@kernel.org, naush@raspberrypi.com, robh@kernel.org,
        tomi.valkeinen@ideasonboard.com,
        bcm-kernel-feedback-list@broadcom.com, stefan.wahren@i2se.com
Subject: Re: [PATCH v5 08/11] media: imx219: Switch from open to init_cfg
Message-ID: <YgKUuLdsOuvHopWp@pendragon.ideasonboard.com>
References: <20220208155027.891055-1-jeanmichel.hautbois@ideasonboard.com>
 <20220208155027.891055-9-jeanmichel.hautbois@ideasonboard.com>
 <YgKUKauDwCIBFovX@pendragon.ideasonboard.com>
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In-Reply-To: <YgKUKauDwCIBFovX@pendragon.ideasonboard.com>
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On Tue, Feb 08, 2022 at 06:02:50PM +0200, Laurent Pinchart wrote:
> Hi Jean-Michel,
> 
> Thank you for the patch.
> 
> On Tue, Feb 08, 2022 at 04:50:24PM +0100, Jean-Michel Hautbois wrote:
> > Use the init_cfg pad level operation instead of the internal subdev
> > open operation to set default formats on the pads.
> > While at it, make the imx219_pad_ops more easier to read.
> 
> It could have been useful to explain here why there's a separate
> imx219_init_formats() function, as reviewers could wonder. It's clear
> when reviewing the next patches though.
> 
> > Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
> > ---
> >  drivers/media/i2c/imx219.c | 63 +++++++++++++++-----------------------
> >  1 file changed, 25 insertions(+), 38 deletions(-)
> > 
> > diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> > index 74dba5e61201..abcaee15c4a0 100644
> > --- a/drivers/media/i2c/imx219.c
> > +++ b/drivers/media/i2c/imx219.c
> > @@ -685,34 +685,6 @@ static void imx219_set_default_format(struct imx219 *imx219)
> >  	fmt->field = V4L2_FIELD_NONE;
> >  }
> >  
> > -static int imx219_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> > -{
> > -	struct imx219 *imx219 = to_imx219(sd);
> > -	struct v4l2_mbus_framefmt *try_fmt =
> > -		v4l2_subdev_get_try_format(sd, fh->state, 0);
> > -	struct v4l2_rect *try_crop;
> > -
> > -	mutex_lock(&imx219->mutex);
> > -
> > -	/* Initialize try_fmt */
> > -	try_fmt->width = supported_modes[0].width;
> > -	try_fmt->height = supported_modes[0].height;
> > -	try_fmt->code = imx219_get_format_code(imx219,
> > -					       MEDIA_BUS_FMT_SRGGB10_1X10);
> > -	try_fmt->field = V4L2_FIELD_NONE;
> > -
> > -	/* Initialize try_crop rectangle. */
> > -	try_crop = v4l2_subdev_get_try_crop(sd, fh->state, 0);
> > -	try_crop->top = IMX219_PIXEL_ARRAY_TOP;
> > -	try_crop->left = IMX219_PIXEL_ARRAY_LEFT;
> > -	try_crop->width = IMX219_PIXEL_ARRAY_WIDTH;
> > -	try_crop->height = IMX219_PIXEL_ARRAY_HEIGHT;
> 
> The crop rectangle initialization is removed here, but not added below.
> 
> > -
> > -	mutex_unlock(&imx219->mutex);
> > -
> > -	return 0;
> > -}
> > -
> >  static int imx219_set_ctrl(struct v4l2_ctrl *ctrl)
> >  {
> >  	struct imx219 *imx219 =
> > @@ -802,6 +774,25 @@ static const struct v4l2_ctrl_ops imx219_ctrl_ops = {
> >  	.s_ctrl = imx219_set_ctrl,
> >  };
> >  
> > +static void imx219_init_formats(struct v4l2_subdev_state *state)
> > +{
> > +	struct v4l2_mbus_framefmt *format;
> > +
> > +	format = v4l2_state_get_stream_format(state, 0, 0);

Also, this won't work until you create routes. The function will return
NULL and you'll crash. This is fixed in subsequent patches, but it
breaks bisection.

> > +	format->code = imx219_mbus_formats[0];
> > +	format->width = supported_modes[0].width;
> > +	format->height = supported_modes[0].height;
> > +	format->field = V4L2_FIELD_NONE;
> > +	format->colorspace = V4L2_COLORSPACE_RAW;
> > +}
> > +
> > +static int imx219_init_cfg(struct v4l2_subdev *sd,
> > +			   struct v4l2_subdev_state *state)
> > +{
> > +	imx219_init_formats(state);
> > +	return 0;
> > +}
> > +
> >  static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
> >  				 struct v4l2_subdev_state *sd_state,
> >  				 struct v4l2_subdev_mbus_code_enum *code)
> > @@ -1255,11 +1246,12 @@ static const struct v4l2_subdev_video_ops imx219_video_ops = {
> >  };
> >  
> >  static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
> > -	.enum_mbus_code = imx219_enum_mbus_code,
> > -	.get_fmt = imx219_get_pad_format,
> > -	.set_fmt = imx219_set_pad_format,
> > -	.get_selection = imx219_get_selection,
> > -	.enum_frame_size = imx219_enum_frame_size,
> > +	.init_cfg		= imx219_init_cfg,
> > +	.enum_mbus_code		= imx219_enum_mbus_code,
> > +	.get_fmt		= imx219_get_pad_format,
> > +	.set_fmt		= imx219_set_pad_format,
> > +	.get_selection		= imx219_get_selection,
> > +	.enum_frame_size	= imx219_enum_frame_size,
> >  };
> >  
> >  static const struct v4l2_subdev_ops imx219_subdev_ops = {
> > @@ -1268,10 +1260,6 @@ static const struct v4l2_subdev_ops imx219_subdev_ops = {
> >  	.pad = &imx219_pad_ops,
> >  };
> >  
> > -static const struct v4l2_subdev_internal_ops imx219_internal_ops = {
> > -	.open = imx219_open,
> > -};
> > -
> >  /* Initialize control handlers */
> >  static int imx219_init_controls(struct imx219 *imx219)
> >  {
> > @@ -1520,7 +1508,6 @@ static int imx219_probe(struct i2c_client *client)
> >  		goto error_power_off;
> >  
> >  	/* Initialize subdev */
> > -	imx219->sd.internal_ops = &imx219_internal_ops;
> >  	imx219->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
> >  			    V4L2_SUBDEV_FL_HAS_EVENTS;
> >  	imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> 
> -- 
> Regards,
> 
> Laurent Pinchart

-- 
Regards,

Laurent Pinchart