Hi James,
On Tue, Oct 15, 2019 at 02:10:53AM +0000, james qian wang (Arm Technology China) wrote:
> This function is used to convert drm 3dlut to komeda HW required 1d curve
This is a 1D LUT, not a 3D LUT
Cheers,
-Brian
> coeffs values.
>
> Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@xxxxxxx>
> Reviewed-by: Mihail Atanassov <mihail.atanassov@xxxxxxx>
> ---
> .../arm/display/komeda/komeda_color_mgmt.c | 52 +++++++++++++++++++
> .../arm/display/komeda/komeda_color_mgmt.h | 9 +++-
> 2 files changed, 60 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> index 9d14a92dbb17..c180ce70c26c 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> @@ -65,3 +65,55 @@ const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
>
> return coeffs;
> }
> +
> +struct gamma_curve_sector {
> + u32 boundary_start;
> + u32 num_of_segments;
> + u32 segment_width;
> +};
> +
> +struct gamma_curve_segment {
> + u32 start;
> + u32 end;
> +};
> +
> +static struct gamma_curve_sector sector_tbl[] = {
> + { 0, 4, 4 },
> + { 16, 4, 4 },
> + { 32, 4, 8 },
> + { 64, 4, 16 },
> + { 128, 4, 32 },
> + { 256, 4, 64 },
> + { 512, 16, 32 },
> + { 1024, 24, 128 },
> +};
> +
> +static void
> +drm_lut_to_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs,
> + struct gamma_curve_sector *sector_tbl, u32 num_sectors)
> +{
> + struct drm_color_lut *lut;
> + u32 i, j, in, num = 0;
> +
> + if (!lut_blob)
> + return;
> +
> + lut = lut_blob->data;
> +
> + for (i = 0; i < num_sectors; i++) {
> + for (j = 0; j < sector_tbl[i].num_of_segments; j++) {
> + in = sector_tbl[i].boundary_start +
> + j * sector_tbl[i].segment_width;
> +
> + coeffs[num++] = drm_color_lut_extract(lut[in].red,
> + KOMEDA_COLOR_PRECISION);
> + }
> + }
> +
> + coeffs[num] = BIT(KOMEDA_COLOR_PRECISION);
> +}
> +
> +void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs)
> +{
> + drm_lut_to_coeffs(lut_blob, coeffs, sector_tbl, ARRAY_SIZE(sector_tbl));
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> index a2df218f58e7..08ab69281648 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> @@ -11,7 +11,14 @@
> #include <drm/drm_color_mgmt.h>
>
> #define KOMEDA_N_YUV2RGB_COEFFS 12
> +#define KOMEDA_N_RGB2YUV_COEFFS 12
> +#define KOMEDA_COLOR_PRECISION 12
> +#define KOMEDA_N_GAMMA_COEFFS 65
> +#define KOMEDA_COLOR_LUT_SIZE BIT(KOMEDA_COLOR_PRECISION)
> +#define KOMEDA_N_CTM_COEFFS 9
> +
> +void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs);
>
> const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range);
>
> -#endif
> +#endif /*_KOMEDA_COLOR_MGMT_H_*/
> --
> 2.20.1
>
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