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Date:   Wed, 4 Mar 2020 21:55:16 +0100
From:   Niklas <niklas.soderlund@...natech.se>
To:     Lad Prabhakar <prabhakar.csengg@...il.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        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 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?

> 
> 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.

>  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().

>  	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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