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SubjectRe: [PATCH v3 1/2] media: rcar-vin: Add support for MEDIA_BUS_FMT_SRGGB8_1X8 format
Hi Niklas,

On Thu, Mar 19, 2020 at 1:13 PM Niklas <niklas.soderlund@ragnatech.se> wrote:
>
> Hi Prabhakar,
>
> Thanks for your work.
>
> On 2020-03-18 17:06:37 +0000, Lad Prabhakar wrote:
> > Add support for MEDIA_BUS_FMT_SRGGB8_1X8 format in rcar-vin by setting
> > format type to RAW8 in VNMC register and appropriately setting the
> > bpp, bytesperline to enable V4L2_PIX_FMT_SRGGB8.
>
> > For RAW8 format data is transferred by 4-Byte unit so VnIS register is
> > configured accordingly.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > drivers/media/platform/rcar-vin/rcar-core.c | 1 +
> > drivers/media/platform/rcar-vin/rcar-dma.c | 11 ++++++++++-
> > drivers/media/platform/rcar-vin/rcar-v4l2.c | 4 ++++
> > 3 files changed, 15 insertions(+), 1 deletion(-)
> >
> > 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:
>
> This is wrong RAW formats are only supported on the CSI-2 interface and
> not the parallel one. This line shall be dropped.
>
sure will drop this.

> > 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-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> > index 1a30cd036371..ec7b49c0b281 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 +588,14 @@ 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 /= 2;
>
> I'm sorry this makes no sens to me.
>
> - The width of the image is number of pixels in the raw format.
> - In memory each row is either is either RGRGRG... or GBGBGB...
> - The pixel size is 1 byte per pixel.
> - We calculate bytesperline as ALIGN(width, align) * bpp, where align is
> how much we need to "adjust" the width to match the VNIS_REG reg
> value. We do this in rvin_format_bytesperline().
> - We then remove bpp from bytesperline and we have a unit in pixels
> which is our stride.
>
> I can't see why you need to cut the stride in half. In my view you
> should add a check for V4L2_PIX_FMT_SRGGB8 in rvin_format_bytesperline()
> and pick an alignment value that matches the restrictions.
>
> I might miss something, but then I wish to learn.
>
I have replied for this issue on v2
(https://lkml.org/lkml/2020/3/27/384) as the VIN
processes RAW8 as 2 byte per pixel.

> > rvin_write(vin, stride, VNIS_REG);
> > }
> >
> > @@ -676,6 +678,9 @@ static int rvin_setup(struct rvin_dev *vin)
> >
> > input_is_yuv = true;
> > break;
> > + case MEDIA_BUS_FMT_SRGGB8_1X8:
> > + vnmc |= VNMC_INF_RAW8;
> > + break;
>
> Here and ...
>
> > default:
> > break;
> > }
> > @@ -737,6 +742,9 @@ 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;
>
> ... here we have a new problem, sorry for not thinking of it before.
>
> 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. This new restriction
> needs to be added to the driver.
>
> Luck has it we can fix ...
>
> > default:
> > vin_err(vin, "Invalid pixelformat (0x%x)\n",
> > vin->format.pixelformat);
> > @@ -1110,6 +1118,7 @@ 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;
>
> ... this here by changes this to
>
> switch (fmt.format.code) {
> case MEDIA_BUS_FMT_YUYV8_1X16:
> 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:
> if (vin->format.pixelformat != V4L2_PIX_FMT_SRGGB8)
> return -EPIPE:
> break;
> default:
> return -EPIPE;
> }
>
> vin->mbus_code = fmt.format.code;
>
Will fix it as above.

Cheers,
--Prabhakar

> > break;
> > default:
> > diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> > index 5151a3cd8a6e..ca542219e8ae 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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