linux-kernel - Re: [PATCH v1] media: i2c: ov5640: Implement get_mbus

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Message-ID: <Y9QZH2/jDbFbew2D@pendragon.ideasonboard.com>
Date:   Fri, 27 Jan 2023 20:34:07 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jacopo Mondi <jacopo.mondi@...asonboard.com>
Cc:     Marcel Ziswiler <marcel@...wiler.com>, linux-media@...r.kernel.org,
        kernel@...gutronix.de, Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Aishwarya Kothari <aishwarya.kothari@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] media: i2c: ov5640: Implement get_mbus_config

On Fri, Jan 27, 2023 at 06:50:03PM +0100, Jacopo Mondi wrote:
> On Fri, Jan 27, 2023 at 04:12:44PM +0100, Marcel Ziswiler wrote:
> > From: Aishwarya Kothari <aishwarya.kothari@...adex.com>
> >
> > Implement the introduced get_mbus_config operation to report the
> > number of used data lanes on the MIPI CSI-2 interface.
> >
> 
> OV5640 can operate in parallel mode too.
> 
> You can check how it currently configured with ov5640_is_csi2() and
> populate struct v4l2_mbus_config accordingly.

I'm also wondering which CSI-2 receiver needs .get_mbus_config() for the
ov5640. The number of lanes is usually specified in DT, on both sides of
the link. It's only when selecting a number of lanes dynamically at
runtime that .get_mbus_config() is needed.

> > Signed-off-by: Aishwarya Kothari <aishwarya.kothari@...adex.com>
> > Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> >
> > ---
> >
> >  drivers/media/i2c/ov5640.c | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> >
> > diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> > index e0f908af581b..42d43f0d1e1c 100644
> > --- a/drivers/media/i2c/ov5640.c
> > +++ b/drivers/media/i2c/ov5640.c
> > @@ -3733,6 +3733,19 @@ static int ov5640_init_cfg(struct v4l2_subdev *sd,
> >  	return 0;
> >  }
> >
> > +static int ov5640_get_mbus_config(struct v4l2_subdev *sd,
> > +				   unsigned int pad,
> > +				   struct v4l2_mbus_config *cfg)
> > +{
> > +	struct ov5640_dev *sensor = to_ov5640_dev(sd);
> > +
> > +	cfg->type = V4L2_MBUS_CSI2_DPHY;
> > +	cfg->bus.mipi_csi2.num_data_lanes = sensor->ep.bus.mipi_csi2.num_data_lanes;
> > +	cfg->bus.mipi_csi2.flags = 0;
> > +
> > +	return 0;
> > +}
> > +
> >  static const struct v4l2_subdev_core_ops ov5640_core_ops = {
> >  	.log_status = v4l2_ctrl_subdev_log_status,
> >  	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> > @@ -3753,6 +3766,7 @@ static const struct v4l2_subdev_pad_ops ov5640_pad_ops = {
> >  	.get_selection = ov5640_get_selection,
> >  	.enum_frame_size = ov5640_enum_frame_size,
> >  	.enum_frame_interval = ov5640_enum_frame_interval,
> > +	.get_mbus_config = ov5640_get_mbus_config,
> >  };
> >
> >  static const struct v4l2_subdev_ops ov5640_subdev_ops = {

-- 
Regards,

Laurent Pinchart