[PATCH v5 26/26] drm: sun4i: de33: csc: add Display Engine 3.3 (DE33) support

Ryan Walklin
2024-09-29T09:14:12Z

Like earlier DE versions, the DE33 has a CSC (Color Space Correction)
module. which provides color space conversion between BT2020/BT709, and
dynamic range conversion between SDR/ST2084/HLG.

Add support for the DE33.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Ryan Walklin <ryan@testtoast.com>
---
drivers/gpu/drm/sun4i/sun8i_csc.c | 96 +++++++++++++++++++++++++++++++
drivers/gpu/drm/sun4i/sun8i_csc.h | 3 +
2 files changed, 99 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun8i_csc.c b/drivers/gpu/drm/sun4i/sun8i_csc.c
index 2d5a2cf7cba24..45bd1ca06400e 100644
--- a/drivers/gpu/drm/sun4i/sun8i_csc.c
+++ b/drivers/gpu/drm/sun4i/sun8i_csc.c
@@ -238,6 +238,14 @@ static const u32 yuv2yuv_de3[2][3][3][12] = {
},
};

+static u32 sun8i_csc_base(struct sun8i_mixer *mixer, int layer)
+{
+ if (mixer->cfg->de_type == sun8i_mixer_de33)
+ return sun8i_channel_base(mixer, layer) - 0x800;
+ else
+ return ccsc_base[mixer->cfg->ccsc][layer];
+}
+
static void sun8i_csc_setup(struct regmap *map, u32 base,
enum format_type fmt_type,
enum drm_color_encoding encoding,
@@ -358,6 +366,90 @@ static void sun8i_de3_ccsc_setup(struct sunxi_engine *engine, int layer,
mask, val);
}

+/* extract constant from high word and invert sign if necessary */
+static u32 sun8i_de33_ccsc_get_constant(u32 value)
+{
+ value >>= 16;
+
+ if (value & BIT(15))
+ return 0x400 - (value & 0x3ff);
+
+ return value;
+}
+
+static void sun8i_de33_convert_table(const u32 *src, u32 *dst)
+{
+ dst[0] = sun8i_de33_ccsc_get_constant(src[3]);
+ dst[1] = sun8i_de33_ccsc_get_constant(src[7]);
+ dst[2] = sun8i_de33_ccsc_get_constant(src[11]);
+ memcpy(&dst[3], src, sizeof(u32) * 12);
+ dst[6] &= 0xffff;
+ dst[10] &= 0xffff;
+ dst[14] &= 0xffff;
+}
+
+static void sun8i_de33_ccsc_setup(struct sun8i_mixer *mixer, int layer,
+ enum format_type fmt_type,
+ enum drm_color_encoding encoding,
+ enum drm_color_range range)
+{
+ u32 addr, val = 0, base, csc[15];
+ struct sunxi_engine *engine;
+ struct regmap *map;
+ const u32 *table;
+ int i;
+
+ table = yuv2rgb_de3[range][encoding];
+ base = sun8i_csc_base(mixer, layer);
+ engine = &mixer->engine;
+ map = engine->regs;
+
+ switch (fmt_type) {
+ case FORMAT_TYPE_RGB:
+ if (engine->format == MEDIA_BUS_FMT_RGB888_1X24)
+ break;
+ val = SUN8I_CSC_CTRL_EN;
+ sun8i_de33_convert_table(rgb2yuv_de3[engine->encoding], csc);
+ regmap_bulk_write(map, SUN50I_CSC_COEFF(base, 0), csc, 15);
+ break;
+ case FORMAT_TYPE_YUV:
+ table = sun8i_csc_get_de3_yuv_table(encoding, range,
+ engine->format,
+ engine->encoding);
+ if (!table)
+ break;
+ val = SUN8I_CSC_CTRL_EN;
+ sun8i_de33_convert_table(table, csc);
+ regmap_bulk_write(map, SUN50I_CSC_COEFF(base, 0), csc, 15);
+ break;
+ case FORMAT_TYPE_YVU:
+ table = sun8i_csc_get_de3_yuv_table(encoding, range,
+ engine->format,
+ engine->encoding);
+ if (!table)
+ table = yuv2yuv_de3[range][encoding][encoding];
+ val = SUN8I_CSC_CTRL_EN;
+ sun8i_de33_convert_table(table, csc);
+ for (i = 0; i < 15; i++) {
+ addr = SUN50I_CSC_COEFF(base, i);
+ if (i > 3) {
+ if (((i - 3) & 3) == 1)
+ addr = SUN50I_CSC_COEFF(base, i + 1);
+ else if (((i - 3) & 3) == 2)
+ addr = SUN50I_CSC_COEFF(base, i - 1);
+ }
+ regmap_write(map, addr, csc[i]);
+ }
+ break;
+ default:
+ val = 0;
+ DRM_WARN("Wrong CSC mode specified.\n");
+ return;
+ }
+
+ regmap_write(map, SUN8I_CSC_CTRL(base), val);
+}
+
void sun8i_csc_set_ccsc(struct sun8i_mixer *mixer, int layer,
enum format_type fmt_type,
enum drm_color_encoding encoding,
@@ -369,6 +461,10 @@ void sun8i_csc_set_ccsc(struct sun8i_mixer *mixer, int layer,
sun8i_de3_ccsc_setup(&mixer->engine, layer,
fmt_type, encoding, range);
return;
+ } else if (mixer->cfg->de_type == sun8i_mixer_de33) {
+ sun8i_de33_ccsc_setup(mixer, layer, fmt_type,
+ encoding, range);
+ return;
}

if (layer < mixer->cfg->vi_num) {
diff --git a/drivers/gpu/drm/sun4i/sun8i_csc.h b/drivers/gpu/drm/sun4i/sun8i_csc.h
index b7546e06e315c..2b762cb79f02c 100644
--- a/drivers/gpu/drm/sun4i/sun8i_csc.h
+++ b/drivers/gpu/drm/sun4i/sun8i_csc.h
@@ -20,6 +20,9 @@ struct sun8i_mixer;
#define SUN8I_CSC_CTRL(base) ((base) + 0x0)
#define SUN8I_CSC_COEFF(base, i) ((base) + 0x10 + 4 * (i))

+#define SUN50I_CSC_COEFF(base, i) ((base) + 0x04 + 4 * (i))
+#define SUN50I_CSC_ALPHA(base) ((base) + 0x40)
+
#define SUN8I_CSC_CTRL_EN BIT(0)

enum format_type {
--
2.46.1