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

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Date:   Tue, 10 Mar 2020 13:46:05 +0100
From:   Niklas <niklas.soderlund@...natech.se>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Lad Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v2 2/3] media: rcar-vin: Add support for
 MEDIA_BUS_FMT_SRGGB8_1X8 format

Hi Lad,

Thanks for your work.

On 2020-03-10 11:06:03 +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.
> 
> 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-dma.c  |  9 ++++++++-
>  drivers/media/platform/rcar-vin/rcar-v4l2.c | 13 ++++++++++++-
>  3 files changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> index 7440c89..76daf2f 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-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> index 1a30cd0..1c1fafa 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)
> @@ -587,7 +588,6 @@ 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);
> @@ -676,6 +676,9 @@ 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 +740,9 @@ 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 +1116,7 @@ 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 5151a3c..4698099 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			= 2,

This does not look right, is not bytes-per-pixel 1 for a SRGGB8?

> +	},
>  };
>  
>  const struct rvin_video_format *rvin_format_from_pixel(struct rvin_dev *vin,
> @@ -102,6 +106,7 @@ static u32 rvin_format_bytesperline(struct rvin_dev *vin,
>  {
>  	const struct rvin_video_format *fmt;
>  	u32 align;
> +	u8 div;
>  
>  	fmt = rvin_format_from_pixel(vin, pix->pixelformat);
>  
> @@ -112,16 +117,22 @@ static u32 rvin_format_bytesperline(struct rvin_dev *vin,
>  	case V4L2_PIX_FMT_NV12:
>  	case V4L2_PIX_FMT_NV16:
>  		align = 0x20;
> +		div = 1;
> +		break;
> +	case V4L2_PIX_FMT_SRGGB8:
> +		align = 0x10;
> +		div = 2;

Yes this does not look right at all, I think you should set bpp to 1 and 
drop the div handling here.

>  		break;
>  	default:
>  		align = 0x10;
> +		div = 1;
>  		break;
>  	}
>  
>  	if (V4L2_FIELD_IS_SEQUENTIAL(pix->field))
>  		align = 0x80;
>  
> -	return ALIGN(pix->width, align) * fmt->bpp;
> +	return ALIGN(pix->width / div, align) * fmt->bpp;
>  }
>  
>  static u32 rvin_format_sizeimage(struct v4l2_pix_format *pix)
> -- 
> 2.7.4
> 

-- 
Regards,
Niklas Söderlund