[v2,15/16] media: renesas: rzg2l-cru: Refactor ICnDMR register configuration

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Refactor the ICnDMR register configuration in
`rzg2l_cru_initialize_image_conv()` by adding a new member `icndmr` in the
`rzg2l_cru_ip_format` structure. This change introduces a new function
`rzg2l_cru_ip_pix_fmt_to_icndmr()` to map the pixel format to its
corresponding ICnDMR value.

Suggested-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h |  5 +++++
 drivers/media/platform/renesas/rzg2l-cru/rzg2l-ip.c  | 12 ++++++++++++
 .../media/platform/renesas/rzg2l-cru/rzg2l-video.c   | 10 ++++------
 3 files changed, 21 insertions(+), 6 deletions(-)

Hi Prabhakar,

Thank you for the patch.

On Tue, Sep 10, 2024 at 06:53:56PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Refactor the ICnDMR register configuration in
> `rzg2l_cru_initialize_image_conv()` by adding a new member `icndmr` in the
> `rzg2l_cru_ip_format` structure. This change introduces a new function
> `rzg2l_cru_ip_pix_fmt_to_icndmr()` to map the pixel format to its
> corresponding ICnDMR value.

Skip this new function, use the function thar returns a
rzg2l_cru_ip_format pointer, and access the icndmr field from there.
rzg2l_cru_initialize_image_conv() already gets the format info pointer,
so the code will be simpler and more efficient.

> 
> Suggested-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
>  drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h |  5 +++++
>  drivers/media/platform/renesas/rzg2l-cru/rzg2l-ip.c  | 12 ++++++++++++
>  .../media/platform/renesas/rzg2l-cru/rzg2l-video.c   | 10 ++++------
>  3 files changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
> index 24097df14881..3da9e8e7025a 100644
> --- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
> @@ -31,6 +31,8 @@
>  #define RZG2L_CRU_MIN_INPUT_HEIGHT	240
>  #define RZG2L_CRU_MAX_INPUT_HEIGHT	4095
>  
> +#define ICnDMR_YCMODE_UYVY		(1 << 4)

Not a candidate for this patch, but I would recommend moving all the
register definitions to this file, or to a rzg2l-cru-regs.h file.

> +
>  enum rzg2l_csi2_pads {
>  	RZG2L_CRU_IP_SINK = 0,
>  	RZG2L_CRU_IP_SOURCE,
> @@ -68,12 +70,14 @@ struct rzg2l_cru_ip {
>   * @format: 4CC format identifier (V4L2_PIX_FMT_*)
>   * @datatype: MIPI CSI2 data type
>   * @bpp: bytes per pixel
> + * @icndmr: ICnDMR register value
>   */
>  struct rzg2l_cru_ip_format {
>  	u32 code;
>  	u32 format;
>  	u32 datatype;
>  	u8 bpp;
> +	u32 icndmr;
>  };
>  
>  /**
> @@ -165,5 +169,6 @@ struct v4l2_mbus_framefmt *rzg2l_cru_ip_get_src_fmt(struct rzg2l_cru_dev *cru);
>  const struct rzg2l_cru_ip_format *rzg2l_cru_ip_code_to_fmt(unsigned int code);
>  u8 rzg2l_cru_ip_pix_fmt_to_bpp(u32 format);
>  int rzg2l_cru_ip_index_to_pix_fmt(u32 index);
> +int rzg2l_cru_ip_pix_fmt_to_icndmr(u32 format);
>  
>  #endif
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-ip.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-ip.c
> index c7bc82bf3f14..9b0563198b50 100644
> --- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-ip.c
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-ip.c
> @@ -17,6 +17,7 @@ static const struct rzg2l_cru_ip_format rzg2l_cru_ip_formats[] = {
>  		.format = V4L2_PIX_FMT_UYVY,
>  		.datatype = MIPI_CSI2_DT_YUV422_8B,
>  		.bpp = 2,
> +		.icndmr = ICnDMR_YCMODE_UYVY,
>  	},
>  };
>  
> @@ -50,6 +51,17 @@ int rzg2l_cru_ip_index_to_pix_fmt(u32 index)
>  	return rzg2l_cru_ip_formats[index].format;
>  }
>  
> +int rzg2l_cru_ip_pix_fmt_to_icndmr(u32 format)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(rzg2l_cru_ip_formats); i++)
> +		if (rzg2l_cru_ip_formats[i].format == format)
> +			return rzg2l_cru_ip_formats[i].icndmr;
> +
> +	return -EINVAL;
> +}
> +
>  struct v4l2_mbus_framefmt *rzg2l_cru_ip_get_src_fmt(struct rzg2l_cru_dev *cru)
>  {
>  	struct v4l2_subdev_state *state;
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
> index c32608c557a3..1f25dcff2515 100644
> --- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
> @@ -88,7 +88,6 @@
>  
>  /* CRU Data Output Mode Register */
>  #define ICnDMR				0x26c
> -#define ICnDMR_YCMODE_UYVY		(1 << 4)
>  
>  #define RZG2L_TIMEOUT_MS		100
>  #define RZG2L_RETRIES			10
> @@ -316,6 +315,7 @@ static int rzg2l_cru_initialize_image_conv(struct rzg2l_cru_dev *cru,
>  	const struct v4l2_format_info *src_finfo, *dst_finfo;
>  	const struct rzg2l_cru_ip_format *cru_ip_fmt;
>  	u32 icndmr;
> +	int ret;
>  
>  	cru_ip_fmt = rzg2l_cru_ip_code_to_fmt(ip_sd_fmt->code);
>  	if (!cru_ip_fmt)
> @@ -327,15 +327,13 @@ static int rzg2l_cru_initialize_image_conv(struct rzg2l_cru_dev *cru,
>  	dst_finfo = v4l2_format_info(cru->format.pixelformat);
>  
>  	/* Output format */
> -	switch (cru->format.pixelformat) {
> -	case V4L2_PIX_FMT_UYVY:
> -		icndmr = ICnDMR_YCMODE_UYVY;
> -		break;
> -	default:
> +	ret = rzg2l_cru_ip_pix_fmt_to_icndmr(cru->format.pixelformat);
> +	if (ret < 0) {
>  		dev_err(cru->dev, "Invalid pixelformat (0x%x)\n",
>  			cru->format.pixelformat);
>  		return -EINVAL;
>  	}
> +	icndmr = ret;
>  
>  	/* If input and output use same colorspace, do bypass mode */
>  	if (v4l2_is_format_yuv(src_finfo) && v4l2_is_format_yuv(dst_finfo))