Re: [PATCH] media: rcar-vin: add support for GREY format

Niklas Söderlund
2021-09-24T10:00:38Z

Hi Nikita and Vladimir,

Thanks for your work.

On 2021-09-24 11:19:39 +0300, Nikita Yushchenko wrote:
> From: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
>
> This adds support for MEDIA_BUS_FMT_Y8_1X8 input and V4L2_PIX_FMT_GREY
> output format.

Thanks for this, I'm happy to see this code!

I been wrestling a while with this as I have no sensor where I could
test it with I always put it off. May I ask what sensor and platform was
used to test this?

The code looks good and I truest that it's tested and produce a good
image, one small nit below.

>
> Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
> Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
> ---
> drivers/media/platform/rcar-vin/rcar-dma.c | 14 ++++++++++++++
> drivers/media/platform/rcar-vin/rcar-v4l2.c | 4 ++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> index f5f722ab1d4e..d2bfd3e575fa 100644
> --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> @@ -114,6 +114,7 @@
> /* Video n Data Mode Register bits */
> #define VNDMR_A8BIT(n) (((n) & 0xff) << 24)
> #define VNDMR_A8BIT_MASK (0xff << 24)
> +#define VNDMR_YMODE_Y8 (1 << 12)
> #define VNDMR_EXRGB (1 << 8)
> #define VNDMR_BPSM (1 << 4)
> #define VNDMR_ABIT (1 << 2)
> @@ -603,6 +604,7 @@ void rvin_crop_scale_comp(struct rvin_dev *vin)
> case V4L2_PIX_FMT_SGBRG8:
> case V4L2_PIX_FMT_SGRBG8:
> case V4L2_PIX_FMT_SRGGB8:
> + case V4L2_PIX_FMT_GREY:
> stride /= 2;
> break;
> default:
> @@ -695,6 +697,7 @@ static int rvin_setup(struct rvin_dev *vin)
> case MEDIA_BUS_FMT_SGBRG8_1X8:
> case MEDIA_BUS_FMT_SGRBG8_1X8:
> case MEDIA_BUS_FMT_SRGGB8_1X8:
> + case MEDIA_BUS_FMT_Y8_1X8:
> vnmc |= VNMC_INF_RAW8;
> break;
> default:
> @@ -774,6 +777,13 @@ static int rvin_setup(struct rvin_dev *vin)
> case V4L2_PIX_FMT_SRGGB8:
> dmr = 0;
> break;
> + case V4L2_PIX_FMT_GREY:
> + if (input_is_yuv) {
> + dmr = VNDMR_DTMD_YCSEP | VNDMR_YMODE_Y8;
> + output_is_yuv = true;
> + } else
> + dmr = 0;

Please encapsulate the else clause in { } if the corresponding if clause
body uses { }.

> + break;
> default:
> vin_err(vin, "Invalid pixelformat (0x%x)\n",
> vin->format.pixelformat);
> @@ -1145,6 +1155,10 @@ static int rvin_mc_validate_format(struct rvin_dev *vin, struct v4l2_subdev *sd,
> if (vin->format.pixelformat != V4L2_PIX_FMT_SRGGB8)
> return -EPIPE;
> break;
> + case MEDIA_BUS_FMT_Y8_1X8:
> + if (vin->format.pixelformat != V4L2_PIX_FMT_GREY)
> + return -EPIPE;
> + break;
> default:
> return -EPIPE;
> }
> diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> index 0d141155f0e3..bdeff51bf768 100644
> --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> @@ -82,6 +82,10 @@ static const struct rvin_video_format rvin_formats[] = {
> .fourcc = V4L2_PIX_FMT_SRGGB8,
> .bpp = 1,
> },
> + {
> + .fourcc = V4L2_PIX_FMT_GREY,
> + .bpp = 1,
> + },
> };
>
> const struct rvin_video_format *rvin_format_from_pixel(struct rvin_dev *vin,
> --
> 2.30.2
>

--
Regards,
Niklas Söderlund