linux-kernel - Re: [PATCH v2 2/3] media: rcar-vin: Add support for MEDIA_BUS_FMT_SRGGB8

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Date:   Wed, 15 Apr 2020 09:21:56 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Niklas <niklas.soderlund@...natech.se>
Cc:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] media: rcar-vin: Add support for
 MEDIA_BUS_FMT_SRGGB8_1X8 format

Hi Niklas,

On Tue, Apr 14, 2020 at 8:39 PM Niklas <niklas.soderlund@...natech.se> wrote:
>
> Hi Lad,
>
> I spent all day playing with different solutions to how to move forward
> with this. My main problem is I have no setup where I can produce RAW
> image formats to test. But reading the datasheet I see the problem you
> are trying to solve.
>
Thank you for looking into this.

> I think for now the best solution might be to in rvin_crop_scale_comp()
> add a check for if the pixelformat is RAW and cut the value written to
> VNIS_REG in half. The bpp for the format shall still be set to 1.
>
>
>     fmt = rvin_format_from_pixel(vin, vin->format.pixelformat);
>     stride = vin->format.bytesperline / fmt->bpp;
>
>     if (vin->format.pixelformat == V4L2_PIX_FMT_SRGGB8)
>         stride /= 2;
>
>     rvin_write(vin, stride, VNIS_REG);
>
> I would also add a nice big comment above the if () that explains why
> the stride is cut in half for raw.
>
Agreed shall do that as above.

Cheers,
--Prabhakar

> On 2020-04-07 11:56:23 +0200, Niklas wrote:
> > Hi Lad,
> >
> > On 2020-04-06 18:20:33 +0100, Lad, Prabhakar wrote:
> > > Did you manage to get the required information on this ?
> >
> > I'm still working on it, sorry for not completing it last week. I will
> > let you know as soon as I can.
> >
> > --
> > Regards,
> > Niklas Söderlund
>
> --
> Regards,
> Niklas Söderlund