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Date:   Sat, 7 Mar 2020 13:09:46 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Niklas <niklas.soderlund@...natech.se>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 2/2] media: rcar-vin: Add support for SRGGB8_1X8

Hi Niklas,

Thank you for the review.

On Wed, Mar 4, 2020 at 8:55 PM Niklas <niklas.soderlund@...natech.se> wrote:
>
> Hi Lad,
>
> Thanks for your work.
>
> On 2020-02-28 16:50:11 +0000, Lad Prabhakar wrote:
> > Most of the RZ/G2x boards can support capturing frames in SRGGB8_1X8
> > format, add support for this with a runtime check that the running
> > hardware supports it.
>
> Where is the runtime check for supported hardware? Also out of curiosity
> which boars can't support SRGGB and what setup are you using to test
> SRGGB capture?
>
My bad l'll drop the statement "runtime check for supported hardware".
All the G2x
boards support SRGGB8. I am currently testing this on a G2E board connected with
a mipi adapter (https://www.96boards.org/product/mipiadapter/) and
raspberry pi camera
module (https://www.raspberrypi.org/products/camera-module-v2/).

> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  drivers/media/platform/rcar-vin/rcar-core.c |  1 +
> >  drivers/media/platform/rcar-vin/rcar-csi2.c |  1 +
> >  drivers/media/platform/rcar-vin/rcar-dma.c  | 14 ++++++++++++--
> >  drivers/media/platform/rcar-vin/rcar-v4l2.c |  4 ++++
>
> This patch shall be split in two. One which touches rcar-csi2.c and one
> for the other files as they are two different drivers.
>
sure will split this patch into two.

> >  4 files changed, 18 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> > index 7440c8965d27..76daf2fe5bcd 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-core.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> > @@ -469,6 +469,7 @@ static int rvin_parallel_subdevice_attach(struct rvin_dev *vin,
> >               case MEDIA_BUS_FMT_UYVY8_2X8:
> >               case MEDIA_BUS_FMT_UYVY10_2X10:
> >               case MEDIA_BUS_FMT_RGB888_1X24:
> > +             case MEDIA_BUS_FMT_SRGGB8_1X8:
> >                       vin->mbus_code = code.code;
> >                       vin_dbg(vin, "Found media bus format for %s: %d\n",
> >                               subdev->name, vin->mbus_code);
> > diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
> > index 5b04e4768eb1..97e4886f63f0 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-csi2.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> > @@ -320,6 +320,7 @@ static const struct rcar_csi2_format rcar_csi2_formats[] = {
> >       { .code = MEDIA_BUS_FMT_YUYV8_1X16,     .datatype = 0x1e, .bpp = 16 },
> >       { .code = MEDIA_BUS_FMT_UYVY8_2X8,      .datatype = 0x1e, .bpp = 16 },
> >       { .code = MEDIA_BUS_FMT_YUYV10_2X10,    .datatype = 0x1e, .bpp = 20 },
> > +     { .code = MEDIA_BUS_FMT_SRGGB8_1X8,     .datatype = 0x2a, .bpp = 8 },
> >  };
> >
> >  static const struct rcar_csi2_format *rcsi2_code_to_fmt(unsigned int code)
> > diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> > index 1a30cd036371..63709b4bbf7a 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> > @@ -85,6 +85,7 @@
> >  #define VNMC_INF_YUV8_BT601  (1 << 16)
> >  #define VNMC_INF_YUV10_BT656 (2 << 16)
> >  #define VNMC_INF_YUV10_BT601 (3 << 16)
> > +#define VNMC_INF_RAW8                (4 << 16)
> >  #define VNMC_INF_YUV16               (5 << 16)
> >  #define VNMC_INF_RGB888              (6 << 16)
> >  #define VNMC_VUP             (1 << 10)
> > @@ -587,13 +588,15 @@ void rvin_crop_scale_comp(struct rvin_dev *vin)
> >       rvin_write(vin, vin->crop.top, VNSLPRC_REG);
> >       rvin_write(vin, vin->crop.top + vin->crop.height - 1, VNELPRC_REG);
> >
> > -
> >       /* TODO: Add support for the UDS scaler. */
> >       if (vin->info->model != RCAR_GEN3)
> >               rvin_crop_scale_comp_gen2(vin);
> >
> >       fmt = rvin_format_from_pixel(vin, vin->format.pixelformat);
> > -     stride = vin->format.bytesperline / fmt->bpp;
> > +     if (vin->format.pixelformat == V4L2_PIX_FMT_SRGGB8)
> > +             stride = ALIGN(vin->format.bytesperline / 2, 0x10);
> > +     else
> > +             stride = vin->format.bytesperline / fmt->bpp;
>
> This does not look right, you should to move this logic into
> rvin_format_bytesperline().
>
sure will move it.

Cheers,
--Prabhakar

> >       rvin_write(vin, stride, VNIS_REG);
> >  }
> >
> > @@ -676,6 +679,9 @@ static int rvin_setup(struct rvin_dev *vin)
> >
> >               input_is_yuv = true;
> >               break;
> > +     case MEDIA_BUS_FMT_SRGGB8_1X8:
> > +             vnmc |= VNMC_INF_RAW8;
> > +             break;
> >       default:
> >               break;
> >       }
> > @@ -737,6 +743,9 @@ static int rvin_setup(struct rvin_dev *vin)
> >       case V4L2_PIX_FMT_ABGR32:
> >               dmr = VNDMR_A8BIT(vin->alpha) | VNDMR_EXRGB | VNDMR_DTMD_ARGB;
> >               break;
> > +     case V4L2_PIX_FMT_SRGGB8:
> > +             dmr = 0;
> > +             break;
> >       default:
> >               vin_err(vin, "Invalid pixelformat (0x%x)\n",
> >                       vin->format.pixelformat);
> > @@ -1110,6 +1119,7 @@ static int rvin_mc_validate_format(struct rvin_dev *vin, struct v4l2_subdev *sd,
> >       case MEDIA_BUS_FMT_UYVY8_2X8:
> >       case MEDIA_BUS_FMT_UYVY10_2X10:
> >       case MEDIA_BUS_FMT_RGB888_1X24:
> > +     case MEDIA_BUS_FMT_SRGGB8_1X8:
> >               vin->mbus_code = fmt.format.code;
> >               break;
> >       default:
> > diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> > index b12b3f88836a..d56cf85ba065 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> > @@ -66,6 +66,10 @@ static const struct rvin_video_format rvin_formats[] = {
> >               .fourcc                 = V4L2_PIX_FMT_ABGR32,
> >               .bpp                    = 4,
> >       },
> > +     {
> > +             .fourcc                 = V4L2_PIX_FMT_SRGGB8,
> > +             .bpp                    = 1,
> > +     },
> >  };
> >
> >  const struct rvin_video_format *rvin_format_from_pixel(struct rvin_dev *vin,
> > --
> > 2.20.1
> >
>
> --
> Regards,
> Niklas Söderlund

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