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

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Message-ID: <CA+V-a8uGmyrSQQULY9sS9r-Ss_Gxw7OBtbYjFYOMpLJ_e=ZRGg@mail.gmail.com>
Date: Fri, 27 Sep 2024 16:31:31 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: 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

Hi Sakari and Laurent,

On Thu, Sep 26, 2024 at 7:57 PM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> 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.
>
Checking only for the source flag should suffice, as the
MEDIA_PAD_FL_INTERNAL flag cannot be set for a source pad because
media_entity_pads_init() enforces this restriction.

Do you agree?

Cheers,
Prabhakar