linux-kernel - Re: [PATCH v4 1/3] media: rcar-vin: Invalidate pipeline if conversion is not possible on input formats

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Date:   Tue, 19 May 2020 15:12:39 +0200
From:   Niklas <niklas.soderlund@...natech.se>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] media: rcar-vin: Invalidate pipeline if
 conversion is not possible on input formats

Hi Lad,

On 2020-05-13 12:16:00 +0100, Lad, Prabhakar wrote:
> Hi Niklas,
> 
> Thank you for the review.
> 
> On Tue, May 12, 2020 at 11:26 PM Niklas <niklas.soderlund@...natech.se> wrote:
> >
> > Hi Lad,
> >
> > Thanks for your work.
> >
> > On 2020-04-15 11:19:06 +0100, Lad Prabhakar wrote:
> > > Up until now the VIN was capable to convert any of its supported input mbus
> > > formats to any of it's supported output pixel formats. With the addition of
> > > RAW formats this is no longer true.
> >
> > Add blank line.
> >
> > > This patch invalidates the pipeline by adding a check if given vin input
> > > format can be converted to supported output pixel format.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > I like this patch I think there is a typo bellow and patch [1] have been
> > merged in the media-tree which unfortunately addes one more thing to do
> > in this patch. In rvin_enum_fmt_vid_cap() there is a TODO noted for what
> > needs to be done. In imagine the fix is simple and the end result would
> > look something like this.
> >
> >     switch (f->mbus_code) {
> >     case 0:
> >     case MEDIA_BUS_FMT_YUYV8_1X16:
> >     case MEDIA_BUS_FMT_UYVY8_1X16:
> >     case MEDIA_BUS_FMT_UYVY8_2X8:
> >     case MEDIA_BUS_FMT_UYVY10_2X10:
> >     case MEDIA_BUS_FMT_RGB888_1X24:
> >         break;
> >     case MEDIA_BUS_FMT_SRGGB8_1X8:
> >         if (f->index)
> >             return -EINVAL;
> >
> >         f->pixelformat = V4L2_PIX_FMT_SRGGB8;
> >         return 0;
> >     case default:
> >         return -EINVAL;
> >     }
> >
> > 1. d5f74a1eff9aef3b ("media: rcar-vin: Make use of V4L2_CAP_IO_MC")
> >
> Sure Ill take of care of this and just repost this patch is that OK with you ?

Yes, also please test it as you point out bellow my last suggesting had 
a typo which would break it ;-)

> 
> > > ---
> > >  drivers/media/platform/rcar-vin/rcar-dma.c | 6 +++++-
> > >  1 file changed, 5 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> > > index 1a30cd036371..48bd9bfc3948 100644
> > > --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> > > +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> > > @@ -1109,13 +1109,17 @@ static int rvin_mc_validate_format(struct rvin_dev *vin, struct v4l2_subdev *sd,
> > >       case MEDIA_BUS_FMT_UYVY8_1X16:
> > >       case MEDIA_BUS_FMT_UYVY8_2X8:
> > >       case MEDIA_BUS_FMT_UYVY10_2X10:
> > > +             break;
> > >       case MEDIA_BUS_FMT_RGB888_1X24:
> > > -             vin->mbus_code = fmt.format.code;
> >
> > This is not right is it?
> >
> > Should you not add a case for MEDIA_BUS_FMT_SRGGB8_1X8 instead of taking
> > over MEDIA_BUS_FMT_RGB888_1X24?
> >
> Agreed, I blindly took this suggestion from your previous comments [1].
> 
> [1] https://lkml.org/lkml/2020/3/19/858
> 
> Cheers,
> --Prabhakar Lad
> 
> > > +             if (vin->format.pixelformat != V4L2_PIX_FMT_SRGGB8)
> > > +                     return -EPIPE;
> > >               break;
> > >       default:
> > >               return -EPIPE;
> > >       }
> > >
> > > +     vin->mbus_code = fmt.format.code;
> > > +
> > >       switch (fmt.format.field) {
> > >       case V4L2_FIELD_TOP:
> > >       case V4L2_FIELD_BOTTOM:
> > > --
> > > 2.20.1
> > >
> >
> > --
> > Regards,
> > Niklas Söderlund

-- 
Regards,
Niklas Söderlund