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

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Message-ID: <ZvWumaGsMPGGwPaS@kekkonen.localdomain>
Date: Thu, 26 Sep 2024 18:57:29 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.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 08:48:19PM +0300, Laurent Pinchart wrote:
> 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 ?

I think you could add that, too, besides the absence of the internal flag.

-- 
Sakari Ailus