Re: [PATCH v2 1/5] media: rkisp1: Add helper function to swap colour channels

Jacopo Mondi
2024-07-04T19:51:08Z

Hi Laurent

On Thu, Jul 04, 2024 at 06:49:28PM GMT, Laurent Pinchart wrote:
> The BLS parameters passed by userspace are specified for named colour
> channels (R, Gr, Gb and B), while the hardware registers reference
> positions in the 2x2 CFA pattern (A, B, C and D).
>
> The BLS values are swapped based on the CFA pattern when writing to or
> reading from registers, using hand-roled switch statements. The logic is
> duplicated already, and new code will require similar processing. Move
> the swap logic to a shared function, using static data to control the
> channels order.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> ---
> Changes since v1:
>
> - Declare swap array with explicit dimensions
> - Move i variable declaration to the loop
> - Move rkisp1_bls_swap_regs() declaration
> ---
> .../platform/rockchip/rkisp1/rkisp1-common.c | 14 +++++
> .../platform/rockchip/rkisp1/rkisp1-common.h | 3 +
> .../platform/rockchip/rkisp1/rkisp1-params.c | 58 ++++---------------
> .../platform/rockchip/rkisp1/rkisp1-stats.c | 51 +++++-----------
> 4 files changed, 43 insertions(+), 83 deletions(-)
>
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.c
> index f956b90a407a..60c97bb7b18b 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.c
> @@ -178,3 +178,17 @@ void rkisp1_sd_adjust_crop(struct v4l2_rect *crop,
>
> rkisp1_sd_adjust_crop_rect(crop, &crop_bounds);
> }
> +
> +void rkisp1_bls_swap_regs(enum rkisp1_fmt_raw_pat_type pattern,
> + const u32 input[4], u32 output[4])
> +{
> + static const unsigned int swap[4][4] = {
> + [RKISP1_RAW_RGGB] = { 0, 1, 2, 3 },
> + [RKISP1_RAW_GRBG] = { 1, 0, 3, 2 },
> + [RKISP1_RAW_GBRG] = { 2, 3, 0, 1 },
> + [RKISP1_RAW_BGGR] = { 3, 2, 1, 0 },
> + };
> +
> + for (unsigned int i = 0; i < 4; ++i)
> + output[i] = input[swap[pattern][i]];
> +}
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> index c1689c0fa05a..a52079261579 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> @@ -603,6 +603,9 @@ void rkisp1_sd_adjust_crop_rect(struct v4l2_rect *crop,
> void rkisp1_sd_adjust_crop(struct v4l2_rect *crop,
> const struct v4l2_mbus_framefmt *bounds);
>
> +void rkisp1_bls_swap_regs(enum rkisp1_fmt_raw_pat_type pattern,
> + const u32 input[4], u32 output[4]);
> +
> /*
> * rkisp1_mbus_info_get_by_code - get the isp info of the media bus code
> *
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> index 25aede5e1af5..c56365c7c51f 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> @@ -165,54 +165,20 @@ static void rkisp1_bls_config(struct rkisp1_params *params,
> new_control &= RKISP1_CIF_ISP_BLS_ENA;
> /* fixed subtraction values */
> if (!arg->enable_auto) {
> - const struct rkisp1_cif_isp_bls_fixed_val *pval =
> - &arg->fixed_val;
> + static const u32 regs[] = {
> + RKISP1_CIF_ISP_BLS_A_FIXED,
> + RKISP1_CIF_ISP_BLS_B_FIXED,
> + RKISP1_CIF_ISP_BLS_C_FIXED,
> + RKISP1_CIF_ISP_BLS_D_FIXED,
> + };
> + u32 swapped[4];
>
> - switch (params->raw_type) {
> - case RKISP1_RAW_BGGR:
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_D_FIXED,
> - pval->r);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_C_FIXED,
> - pval->gr);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_B_FIXED,
> - pval->gb);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_A_FIXED,
> - pval->b);
> - break;
> - case RKISP1_RAW_GBRG:
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_C_FIXED,
> - pval->r);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_D_FIXED,
> - pval->gr);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_A_FIXED,
> - pval->gb);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_B_FIXED,
> - pval->b);
> - break;
> - case RKISP1_RAW_GRBG:
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_B_FIXED,
> - pval->r);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_A_FIXED,
> - pval->gr);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_D_FIXED,
> - pval->gb);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_C_FIXED,
> - pval->b);
> - break;
> - case RKISP1_RAW_RGGB:
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_A_FIXED,
> - pval->r);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_B_FIXED,
> - pval->gr);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_C_FIXED,
> - pval->gb);
> - rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_D_FIXED,
> - pval->b);
> - break;
> - default:
> - break;
> - }
> + rkisp1_bls_swap_regs(params->raw_type, regs, swapped);
>
> + rkisp1_write(params->rkisp1, swapped[0], arg->fixed_val.r);
> + rkisp1_write(params->rkisp1, swapped[1], arg->fixed_val.gr);
> + rkisp1_write(params->rkisp1, swapped[2], arg->fixed_val.gb);
> + rkisp1_write(params->rkisp1, swapped[3], arg->fixed_val.b);
> } else {
> if (arg->en_windows & BIT(1)) {
> rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_BLS_H2_START,
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-stats.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-stats.c
> index 2795eef91bdd..a502719e916a 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-stats.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-stats.c
> @@ -304,48 +304,25 @@ static void rkisp1_stats_get_hst_meas_v12(struct rkisp1_stats *stats,
> static void rkisp1_stats_get_bls_meas(struct rkisp1_stats *stats,
> struct rkisp1_stat_buffer *pbuf)
> {
> + static const u32 regs[] = {
> + RKISP1_CIF_ISP_BLS_A_MEASURED,
> + RKISP1_CIF_ISP_BLS_B_MEASURED,
> + RKISP1_CIF_ISP_BLS_C_MEASURED,
> + RKISP1_CIF_ISP_BLS_D_MEASURED,
> + };
> struct rkisp1_device *rkisp1 = stats->rkisp1;
> const struct rkisp1_mbus_info *in_fmt = rkisp1->isp.sink_fmt;
> struct rkisp1_cif_isp_bls_meas_val *bls_val;
> + u32 swapped[4];
> +
> + rkisp1_bls_swap_regs(in_fmt->bayer_pat, regs, swapped);
>
> bls_val = &pbuf->params.ae.bls_val;
> - if (in_fmt->bayer_pat == RKISP1_RAW_BGGR) {
> - bls_val->meas_b =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_A_MEASURED);
> - bls_val->meas_gb =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_B_MEASURED);
> - bls_val->meas_gr =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_C_MEASURED);
> - bls_val->meas_r =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_D_MEASURED);
> - } else if (in_fmt->bayer_pat == RKISP1_RAW_GBRG) {
> - bls_val->meas_gb =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_A_MEASURED);
> - bls_val->meas_b =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_B_MEASURED);
> - bls_val->meas_r =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_C_MEASURED);
> - bls_val->meas_gr =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_D_MEASURED);
> - } else if (in_fmt->bayer_pat == RKISP1_RAW_GRBG) {
> - bls_val->meas_gr =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_A_MEASURED);
> - bls_val->meas_r =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_B_MEASURED);
> - bls_val->meas_b =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_C_MEASURED);
> - bls_val->meas_gb =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_D_MEASURED);
> - } else if (in_fmt->bayer_pat == RKISP1_RAW_RGGB) {
> - bls_val->meas_r =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_A_MEASURED);
> - bls_val->meas_gr =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_B_MEASURED);
> - bls_val->meas_gb =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_C_MEASURED);
> - bls_val->meas_b =
> - rkisp1_read(rkisp1, RKISP1_CIF_ISP_BLS_D_MEASURED);
> - }
> +
> + bls_val->meas_r = rkisp1_read(rkisp1, swapped[0]);
> + bls_val->meas_gr = rkisp1_read(rkisp1, swapped[1]);
> + bls_val->meas_gb = rkisp1_read(rkisp1, swapped[2]);
> + bls_val->meas_b = rkisp1_read(rkisp1, swapped[3]);
> }
>
> static const struct rkisp1_stats_ops rkisp1_v10_stats_ops = {
> --
> Regards,
>
> Laurent Pinchart