Re: [PATCH v6 6/8] drm/mediatek: add matrix_bits private data for ccorr

[Chun-Kuang Hu]

Hi, Hsin-Yi:

Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> 於 2021年2月2日 週二 下午4:14寫道：
>
> From: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
>
> Add matrix_bits and coeffs_precision to ccorr private data:
> - matrix bits of mt8183 is 10
> - matrix bits of mt8192 is 11

Applied to mediatek-drm-next [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang.

>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
> Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ccorr.c | 27 ++++++++++++++---------
>  1 file changed, 17 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
> index 6c86673a835c3..141cb36b9c07b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
> @@ -30,7 +30,7 @@
>  #define DISP_CCORR_COEF_4                      0x0090
>
>  struct mtk_disp_ccorr_data {
> -       u32 reserved;
> +       u32 matrix_bits;
>  };
>
>  /**
> @@ -85,21 +85,22 @@ void mtk_ccorr_stop(struct device *dev)
>         writel_relaxed(0x0, ccorr->regs + DISP_CCORR_EN);
>  }
>
> -/* Converts a DRM S31.32 value to the HW S1.10 format. */
> -static u16 mtk_ctm_s31_32_to_s1_10(u64 in)
> +/* Converts a DRM S31.32 value to the HW S1.n format. */
> +static u16 mtk_ctm_s31_32_to_s1_n(u64 in, u32 n)
>  {
>         u16 r;
>
>         /* Sign bit. */
> -       r = in & BIT_ULL(63) ? BIT(11) : 0;
> +       r = in & BIT_ULL(63) ? BIT(n + 1) : 0;
>
>         if ((in & GENMASK_ULL(62, 33)) > 0) {
> -               /* identity value 0x100000000 -> 0x400, */
> +               /* identity value 0x100000000 -> 0x400(mt8183), */
> +               /* identity value 0x100000000 -> 0x800(mt8192), */
>                 /* if bigger this, set it to max 0x7ff. */
> -               r |= GENMASK(10, 0);
> +               r |= GENMASK(n, 0);
>         } else {
> -               /* take the 11 most important bits. */
> -               r |= (in >> 22) & GENMASK(10, 0);
> +               /* take the n+1 most important bits. */
> +               r |= (in >> (32 - n)) & GENMASK(n, 0);
>         }
>
>         return r;
> @@ -114,6 +115,7 @@ void mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state)
>         uint16_t coeffs[9] = { 0 };
>         int i;
>         struct cmdq_pkt *cmdq_pkt = NULL;
> +       u32 matrix_bits = ccorr->data->matrix_bits;
>
>         if (!blob)
>                 return;
> @@ -122,7 +124,7 @@ void mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state)
>         input = ctm->matrix;
>
>         for (i = 0; i < ARRAY_SIZE(coeffs); i++)
> -               coeffs[i] = mtk_ctm_s31_32_to_s1_10(input[i]);
> +               coeffs[i] = mtk_ctm_s31_32_to_s1_n(input[i], matrix_bits);
>
>         mtk_ddp_write(cmdq_pkt, coeffs[0] << 16 | coeffs[1],
>                       &ccorr->cmdq_reg, ccorr->regs, DISP_CCORR_COEF_0);
> @@ -199,8 +201,13 @@ static int mtk_disp_ccorr_remove(struct platform_device *pdev)
>         return 0;
>  }
>
> +static const struct mtk_disp_ccorr_data mt8183_ccorr_driver_data = {
> +       .matrix_bits = 10,
> +};
> +
>  static const struct of_device_id mtk_disp_ccorr_driver_dt_match[] = {
> -       { .compatible = "mediatek,mt8183-disp-ccorr"},
> +       { .compatible = "mediatek,mt8183-disp-ccorr",
> +         .data = &mt8183_ccorr_driver_data},
>         {},
>  };
>  MODULE_DEVICE_TABLE(of, mtk_disp_ccorr_driver_dt_match);
> --
> 2.30.0.365.g02bc693789-goog
>
>
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