Re: [PATCH v4 3/3] drm/vc4: plane: Add support for YUV color encodings and ranges

Thomas Zimmermann <tzimmermann@xxxxxxx> · Wed, 15 Dec 2021 16:13:19 +0100

Hi

Am 15.12.21 um 10:17 schrieb Maxime Ripard:
From: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>

The BT601/BT709 color encoding and limited vs full
range properties were not being exposed, defaulting
always to BT601 limited range.

Expose the parameters and set the registers appropriately.

Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

---
  drivers/gpu/drm/vc4/vc4_plane.c | 71 +++++++++++++++++++++++++++++++--
  drivers/gpu/drm/vc4/vc4_regs.h  | 19 ++++++---
  2 files changed, 82 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 022cd12f561e..920a9eefe426 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -623,6 +623,51 @@ static int vc4_plane_allocate_lbm(struct drm_plane_state *state)
  	return 0;
  }
  
+/*
+ * The colorspace conversion matrices are held in 3 entries in the dlist.
+ * Create an array of them, with entries for each full and limited mode, and
+ * each supported colorspace.
+ */
+static const u32 colorspace_coeffs[2][DRM_COLOR_ENCODING_MAX][3] = {
+	{
+		/* Limited range */
+		{
+			/* BT601 */
+			SCALER_CSC0_ITR_R_601_5,
+			SCALER_CSC1_ITR_R_601_5,
+			SCALER_CSC2_ITR_R_601_5,
+		}, {
+			/* BT709 */
+			SCALER_CSC0_ITR_R_709_3,
+			SCALER_CSC1_ITR_R_709_3,
+			SCALER_CSC2_ITR_R_709_3,
+		}, {
+			/* BT2020 */
+			SCALER_CSC0_ITR_R_2020,
+			SCALER_CSC1_ITR_R_2020,
+			SCALER_CSC2_ITR_R_2020,
+		}
+	}, {
+		/* Full range */
+		{
+			/* JFIF */
+			SCALER_CSC0_JPEG_JFIF,
+			SCALER_CSC1_JPEG_JFIF,
+			SCALER_CSC2_JPEG_JFIF,
+		}, {
+			/* BT709 */
+			SCALER_CSC0_ITR_R_709_3_FR,
+			SCALER_CSC1_ITR_R_709_3_FR,
+			SCALER_CSC2_ITR_R_709_3_FR,
+		}, {
+			/* BT2020 */
+			SCALER_CSC0_ITR_R_2020_FR,
+			SCALER_CSC1_ITR_R_2020_FR,
+			SCALER_CSC2_ITR_R_2020_FR,
+		}
+	}
+};
+
  /* Writes out a full display list for an active plane to the plane's
   * private dlist state.
   */
@@ -1017,9 +1062,20 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
  
  	/* Colorspace conversion words */
  	if (vc4_state->is_yuv) {
-		vc4_dlist_write(vc4_state, SCALER_CSC0_ITR_R_601_5);
-		vc4_dlist_write(vc4_state, SCALER_CSC1_ITR_R_601_5);
-		vc4_dlist_write(vc4_state, SCALER_CSC2_ITR_R_601_5);
+		enum drm_color_encoding color_encoding = state->color_encoding;
+		enum drm_color_range color_range = state->color_range;
+		const u32 *ccm;
+
+		if (color_encoding >= DRM_COLOR_ENCODING_MAX)
+			color_encoding = DRM_COLOR_YCBCR_BT601;
+		if (color_range >= DRM_COLOR_RANGE_MAX)
+			color_range = DRM_COLOR_YCBCR_LIMITED_RANGE;
+
+		ccm = colorspace_coeffs[color_range][color_encoding];
+
+		vc4_dlist_write(vc4_state, ccm[0]);
+		vc4_dlist_write(vc4_state, ccm[1]);
+		vc4_dlist_write(vc4_state, ccm[2]);
  	}
  
  	vc4_state->lbm_offset = 0;
@@ -1448,6 +1504,15 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
  					   DRM_MODE_REFLECT_X |
  					   DRM_MODE_REFLECT_Y);
  
+	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_BT709,
+					  DRM_COLOR_YCBCR_LIMITED_RANGE);
+
  	return plane;
  }
  
diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
index 489f921ef44d..7538b84a6dca 100644
--- a/drivers/gpu/drm/vc4/vc4_regs.h
+++ b/drivers/gpu/drm/vc4/vc4_regs.h
@@ -975,7 +975,10 @@ enum hvs_pixel_format {
  #define SCALER_CSC0_COEF_CR_OFS_SHIFT		0
  #define SCALER_CSC0_ITR_R_601_5			0x00f00000
  #define SCALER_CSC0_ITR_R_709_3			0x00f00000
+#define SCALER_CSC0_ITR_R_2020			0x00f00000
  #define SCALER_CSC0_JPEG_JFIF			0x00000000
+#define SCALER_CSC0_ITR_R_709_3_FR		0x00000000
+#define SCALER_CSC0_ITR_R_2020_FR		0x00000000
  
  /* S2.8 contribution of Cb to Green */
  #define SCALER_CSC1_COEF_CB_GRN_MASK		VC4_MASK(31, 22)
@@ -990,8 +993,11 @@ enum hvs_pixel_format {
  #define SCALER_CSC1_COEF_CR_BLU_MASK		VC4_MASK(1, 0)
  #define SCALER_CSC1_COEF_CR_BLU_SHIFT		0
  #define SCALER_CSC1_ITR_R_601_5			0xe73304a8
-#define SCALER_CSC1_ITR_R_709_3			0xf2b784a8
-#define SCALER_CSC1_JPEG_JFIF			0xea34a400
+#define SCALER_CSC1_ITR_R_709_3			0xf27784a8
+#define SCALER_CSC1_ITR_R_2020			0xf43594a8
+#define SCALER_CSC1_JPEG_JFIF			0xea349400
+#define SCALER_CSC1_ITR_R_709_3_FR		0xf4388400
+#define SCALER_CSC1_ITR_R_2020_FR		0xf5b6d400
  
  /* S2.8 contribution of Cb to Red */
  #define SCALER_CSC2_COEF_CB_RED_MASK		VC4_MASK(29, 20)
@@ -1002,9 +1008,12 @@ enum hvs_pixel_format {
  /* S2.8 contribution of Cb to Blue */
  #define SCALER_CSC2_COEF_CB_BLU_MASK		VC4_MASK(19, 10)
  #define SCALER_CSC2_COEF_CB_BLU_SHIFT		10
-#define SCALER_CSC2_ITR_R_601_5			0x00066204
-#define SCALER_CSC2_ITR_R_709_3			0x00072a1c
-#define SCALER_CSC2_JPEG_JFIF			0x000599c5
+#define SCALER_CSC2_ITR_R_601_5			0x00066604
+#define SCALER_CSC2_ITR_R_709_3			0x00072e1d
+#define SCALER_CSC2_ITR_R_2020			0x0006b624
+#define SCALER_CSC2_JPEG_JFIF			0x00059dc6
+#define SCALER_CSC2_ITR_R_709_3_FR		0x00064ddb
+#define SCALER_CSC2_ITR_R_2020_FR		0x0005e5e2
  
  #define SCALER_TPZ0_VERT_RECALC			BIT(31)
  #define SCALER_TPZ0_SCALE_MASK			VC4_MASK(28, 8)


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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