drm/komeda: Enable color-encoding (YUV format) support

Adds color-encoding properties if layer can support YUV format.
Updates HW YUV-RGB matrix state according to the color-encoding
properties.
Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com>
Reviewed-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/display/komeda/Makefile

@@ -8,6 +8,7 @@ komeda-y := \
 	komeda_drv.o \
 	komeda_dev.o \
 	komeda_format_caps.o \
+	komeda_color_mgmt.o \
 	komeda_pipeline.o \
 	komeda_pipeline_state.o \
 	komeda_framebuffer.o \

drivers/gpu/drm/arm/display/komeda/d71/d71_component.c

@@ -10,6 +10,7 @@
 #include "komeda_kms.h"
 #include "malidp_io.h"
 #include "komeda_framebuffer.h"
+#include "komeda_color_mgmt.h"
 
 static void get_resources_id(u32 hw_id, u32 *pipe_id, u32 *comp_id)
 {
@@ -239,6 +240,11 @@ static void d71_layer_update(struct komeda_component *c,
 		}
 
 		malidp_write32(reg, LAYER_R_CONTROL, upsampling);
+		malidp_write_group(reg, LAYER_YUV_RGB_COEFF0,
+				   KOMEDA_N_YUV2RGB_COEFFS,
+				   komeda_select_yuv2rgb_coeffs(
+					plane_st->color_encoding,
+					plane_st->color_range));
 	}
 
 	malidp_write32(reg, LAYER_FMT, kfb->format_caps->hw_id);

drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+
+#include "komeda_color_mgmt.h"
+
+/* 10bit precision YUV2RGB matrix */
+static const s32 yuv2rgb_bt601_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
+	1192,    0, 1634,
+	1192, -401, -832,
+	1192, 2066,    0,
+	  64,  512,  512
+};
+
+static const s32 yuv2rgb_bt601_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
+	1024,    0, 1436,
+	1024, -352, -731,
+	1024, 1815,    0,
+	   0,  512,  512
+};
+
+static const s32 yuv2rgb_bt709_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
+	1192,    0, 1836,
+	1192, -218, -546,
+	1192, 2163,    0,
+	  64,  512,  512
+};
+
+static const s32 yuv2rgb_bt709_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
+	1024,    0, 1613,
+	1024, -192, -479,
+	1024, 1900,    0,
+	   0,  512,  512
+};
+
+static const s32 yuv2rgb_bt2020[KOMEDA_N_YUV2RGB_COEFFS] = {
+	1024,    0, 1476,
+	1024, -165, -572,
+	1024, 1884,    0,
+	   0,  512,  512
+};
+
+const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
+{
+	bool narrow = color_range == DRM_COLOR_YCBCR_LIMITED_RANGE;
+	const s32 *coeffs;
+
+	switch (color_encoding) {
+	case DRM_COLOR_YCBCR_BT709:
+		coeffs = narrow ? yuv2rgb_bt709_narrow : yuv2rgb_bt709_wide;
+		break;
+	case DRM_COLOR_YCBCR_BT601:
+		coeffs = narrow ? yuv2rgb_bt601_narrow : yuv2rgb_bt601_wide;
+		break;
+	case DRM_COLOR_YCBCR_BT2020:
+		coeffs = yuv2rgb_bt2020;
+		break;
+	default:
+		coeffs = NULL;
+		break;
+	}
+
+	return coeffs;
+}

drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+
+#ifndef _KOMEDA_COLOR_MGMT_H_
+#define _KOMEDA_COLOR_MGMT_H_
+
+#include <drm/drm_color_mgmt.h>
+
+#define KOMEDA_N_YUV2RGB_COEFFS		12
+
+const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range);
+
+#endif

drivers/gpu/drm/arm/display/komeda/komeda_plane.c

@@ -137,6 +137,8 @@ static void komeda_plane_reset(struct drm_plane *plane)
 		state->base.pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
 		state->base.alpha = DRM_BLEND_ALPHA_OPAQUE;
 		state->base.zpos = kplane->layer->base.id;
+		state->base.color_encoding = DRM_COLOR_YCBCR_BT601;
+		state->base.color_range = DRM_COLOR_YCBCR_LIMITED_RANGE;
 		plane->state = &state->base;
 		plane->state->plane = plane;
 	}
@@ -332,6 +334,17 @@ static int komeda_plane_add(struct komeda_kms_dev *kms,
 	if (err)
 		goto cleanup;
 
+	err = drm_plane_create_color_properties(plane,
+			BIT(DRM_COLOR_YCBCR_BT601) |
+			BIT(DRM_COLOR_YCBCR_BT709) |
+			BIT(DRM_COLOR_YCBCR_BT2020),
+			BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
+			BIT(DRM_COLOR_YCBCR_FULL_RANGE),
+			DRM_COLOR_YCBCR_BT601,
+			DRM_COLOR_YCBCR_LIMITED_RANGE);
+	if (err)
+		goto cleanup;
+
 	return 0;
 cleanup:
 	komeda_plane_destroy(plane);