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From:   "james qian wang (Arm Technology China)" <james.qian.wang@arm.com>
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        "Channing Chen (Arm Technology China)" <Channing.Chen@arm.com>,
        Mihail Atanassov <Mihail.Atanassov@arm.com>,
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Subject: [PATCH v7 2/4] drm/komeda: Add drm_lut_to_fgamma_coeffs()
Thread-Topic: [PATCH v7 2/4] drm/komeda: Add drm_lut_to_fgamma_coeffs()
Thread-Index: AQHViW0eTRzKlLORfEigId1iRu45AQ==
Date:   Wed, 23 Oct 2019 06:43:02 +0000
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This function is used to convert drm color lut to komeda HW required curve
coeffs values.

Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@arm.=
com>
Reviewed-by: Mihail Atanassov <mihail.atanassov@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/drive=
rs/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_encodi=
ng, u32 color_range)
=20
 	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[] =3D {
+	{ 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 =3D 0;
+
+	if (!lut_blob)
+		return;
+
+	lut =3D lut_blob->data;
+
+	for (i =3D 0; i < num_sectors; i++) {
+		for (j =3D 0; j < sector_tbl[i].num_of_segments; j++) {
+			in =3D sector_tbl[i].boundary_start +
+			     j * sector_tbl[i].segment_width;
+
+			coeffs[num++] =3D drm_color_lut_extract(lut[in].red,
+						KOMEDA_COLOR_PRECISION);
+		}
+	}
+
+	coeffs[num] =3D BIT(KOMEDA_COLOR_PRECISION);
+}
+
+void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coe=
ffs)
+{
+	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/drive=
rs/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>
=20
 #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 *coe=
ffs);
=20
 const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_rang=
e);
=20
-#endif
+#endif /*_KOMEDA_COLOR_MGMT_H_*/
--=20
2.20.1