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:   Wed, 13 May 2020 12:16:00 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Niklas <niklas.soderlund@...natech.se>
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 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 ?

> > ---
> >  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