linux-kernel - Re: [PATCH v2 11/11] media: i2c: ov5645: Report streams using frame descriptors

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Message-ID: <20240926174819.GK21788@pendragon.ideasonboard.com>
Date: Thu, 26 Sep 2024 20:48:19 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Prabhakar <prabhakar.csengg@...il.com>,
	Kieran Bingham <kieran.bingham@...asonboard.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Jacopo Mondi <jacopo.mondi@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 11/11] media: i2c: ov5645: Report streams using frame
 descriptors

On Thu, Sep 26, 2024 at 03:45:26PM +0000, Sakari Ailus wrote:
> Hi Prabhakar,
> 
> Thanks for the set. It looks largely very nice to me, after addressing
> Laurent's comments. A few comments here and possibly on other patches...
> 
> On Tue, Sep 10, 2024 at 06:06:10PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > 
> > Implement the .get_frame_desc() subdev operation to report information
> > about streams to the connected CSI-2 receiver. This is required to let
> > the CSI-2 receiver driver know about virtual channels and data types for
> > each stream.
> > 
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  drivers/media/i2c/ov5645.c | 28 ++++++++++++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> > 
> > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > index 7f1133292ffc..c24eb6e7a7b5 100644
> > --- a/drivers/media/i2c/ov5645.c
> > +++ b/drivers/media/i2c/ov5645.c
> > @@ -28,6 +28,7 @@
> >  #include <linux/regulator/consumer.h>
> >  #include <linux/slab.h>
> >  #include <linux/types.h>
> > +#include <media/mipi-csi2.h>
> >  #include <media/v4l2-ctrls.h>
> >  #include <media/v4l2-event.h>
> >  #include <media/v4l2-fwnode.h>
> > @@ -829,6 +830,32 @@ static const struct v4l2_ctrl_ops ov5645_ctrl_ops = {
> >  	.s_ctrl = ov5645_s_ctrl,
> >  };
> >  
> > +static int ov5645_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
> > +				 struct v4l2_mbus_frame_desc *fd)
> > +{
> > +	const struct v4l2_mbus_framefmt *fmt;
> > +	struct v4l2_subdev_state *state;
> > +
> > +	if (pad != OV5645_PAD_SOURCE)
> > +		return -EINVAL;
> 
> As you have a single source pad, and pretty much all sensor drivers will, I
> think it'd be nice to add a check for this (that it's not an internal pad)
> to the caller side in v4l2-subdev.c. And of course drop this one.

What check would you add, just verifying that the pad is a source pad ?

> > +
> > +	state = v4l2_subdev_lock_and_get_active_state(sd);
> > +	fmt = v4l2_subdev_state_get_format(state, OV5645_PAD_SOURCE, 0);
> > +	v4l2_subdev_unlock_state(state);
> > +
> > +	fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
> > +	fd->num_entries = 1;
> > +
> > +	memset(fd->entry, 0, sizeof(fd->entry));
> > +
> > +	fd->entry[0].pixelcode = fmt->code;
> > +	fd->entry[0].stream = 0;
> > +	fd->entry[0].bus.csi2.vc = 0;
> > +	fd->entry[0].bus.csi2.dt = MIPI_CSI2_DT_YUV422_8B;
> > +
> > +	return 0;
> > +}
> > +
> >  static int ov5645_enum_mbus_code(struct v4l2_subdev *sd,
> >  				 struct v4l2_subdev_state *sd_state,
> >  				 struct v4l2_subdev_mbus_code_enum *code)
> > @@ -1062,6 +1089,7 @@ static const struct v4l2_subdev_video_ops ov5645_video_ops = {
> >  };
> >  
> >  static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
> > +	.get_frame_desc = ov5645_get_frame_desc,
> >  	.enum_mbus_code = ov5645_enum_mbus_code,
> >  	.enum_frame_size = ov5645_enum_frame_size,
> >  	.get_fmt = v4l2_subdev_get_fmt,
> > 

-- 
Regards,

Laurent Pinchart