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    Subject[PATCH v2 2/4] drm/komeda: Add drm_lut_to_fgamma_coeffs()
    Date
    This function is used to convert drm 3dlut to komeda HW required 1d curve
    coeffs values.

    Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@arm.com>
    ---
    .../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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