[RFC PATCH v4 38/42] drm/colorop: Add 1D Curve Custom LUT type

[Harry Wentland <harry.wentland@amd.com>]

From: Alex Hung <alex.hung@amd.com>

We've previously introduced DRM_COLOROP_1D_CURVE for
pre-defined 1D curves. But we also have HW that supports
custom curves and userspace needs the ability to pass
custom curves, aka LUTs.

This patch introduces a new colorop type, called
DRM_COLOROP_1D_LUT that provides a SIZE property which
is used by a driver to advertise the supported SIZE
of the LUT, as well as a DATA property which userspace
uses to set the LUT.

DATA and size function in the same way as current drm_crtc
GAMMA and DEGAMMA LUTs.

Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Co-developed-by: Harry Wentland <harry.wentland@amd.com>
---
 drivers/gpu/drm/drm_atomic.c      |  4 ++++
 drivers/gpu/drm/drm_atomic_uapi.c |  5 +++++
 drivers/gpu/drm/drm_colorop.c     | 36 +++++++++++++++++++++++++++++--
 include/drm/drm_colorop.h         | 16 ++++++++++++++
 include/uapi/drm/drm_mode.h       |  1 +
 5 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 6e736ffa6d7c..f7d51839ca03 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -799,6 +799,10 @@ static void drm_atomic_colorop_print_state(struct drm_printer *p,
 		drm_printf(p, "\tcurve_1d_type=%s\n",
 			   drm_get_colorop_curve_1d_type_name(state->curve_1d_type));
 		break;
+	case DRM_COLOROP_1D_LUT:
+		drm_printf(p, "\tsize=%d\n", state->size);
+		drm_printf(p, "\tdata blob id=%d\n", state->data ? state->data->base.id : 0);
+		break;
 	case DRM_COLOROP_CTM_3X4:
 		drm_printf(p, "\tdata blob id=%d\n", state->data ? state->data->base.id : 0);
 		break;
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index c7c1c614b0d9..6bfe857720cd 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -700,6 +700,9 @@ static int drm_atomic_color_set_data_property(struct drm_colorop *colorop,
 	bool replaced = false;
 
 	switch (colorop->type) {
+	case DRM_COLOROP_1D_LUT:
+		size = state->size * sizeof(struct drm_color_lut);
+		break;
 	case DRM_COLOROP_CTM_3X4:
 		size = sizeof(struct drm_color_ctm_3x4);
 		break;
@@ -749,6 +752,8 @@ drm_atomic_colorop_get_property(struct drm_colorop *colorop,
 		*val = state->bypass;
 	} else if (property == colorop->curve_1d_type_property) {
 		*val = state->curve_1d_type;
+	} else if (property == colorop->size_property) {
+		*val = state->size;
 	} else if (property == colorop->data_property) {
 		*val = (state->data) ? state->data->base.id : 0;
 	} else {
diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index b10cad5a7208..4452eaeeb242 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -34,6 +34,7 @@
 
 static const struct drm_prop_enum_list drm_colorop_type_enum_list[] = {
 	{ DRM_COLOROP_1D_CURVE, "1D Curve" },
+	{ DRM_COLOROP_1D_LUT, "1D Curve Custom LUT" },
 	{ DRM_COLOROP_CTM_3X4, "3x4 Matrix"}
 };
 
@@ -175,11 +176,41 @@ static int drm_colorop_create_data_prop(struct drm_device *dev, struct drm_color
 
 	colorop->data_property = prop;
 	drm_object_attach_property(&colorop->base,
-					colorop->data_property,
-					0);
+				   colorop->data_property,
+				   0);
 
 	return 0;
 }
+int drm_colorop_curve_1d_lut_init(struct drm_device *dev, struct drm_colorop *colorop,
+				  struct drm_plane *plane, uint32_t lut_size)
+{
+	struct drm_property *prop;
+	int ret;
+
+	ret = drm_colorop_init(dev, colorop, plane, DRM_COLOROP_1D_LUT);
+	if (ret)
+		return ret;
+
+	/* initialize 1D LUT only attribute */
+	/* LUT size */
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, "SIZE", lut_size, lut_size);
+	if (!prop)
+		return -ENOMEM;
+
+	colorop->size_property = prop;
+	drm_object_attach_property(&colorop->base, colorop->size_property, 0);
+
+	/* data */
+	ret = drm_colorop_create_data_prop(dev, colorop);
+	if (ret)
+		return ret;
+
+	drm_colorop_reset(colorop);
+	colorop->state->size = lut_size;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_colorop_curve_1d_lut_init);
 
 int drm_colorop_ctm_3x4_init(struct drm_device *dev, struct drm_colorop *colorop,
 			     struct drm_plane *plane)
@@ -301,6 +332,7 @@ EXPORT_SYMBOL(drm_colorop_reset);
 
 static const char * const colorop_type_name[] = {
 	[DRM_COLOROP_1D_CURVE] = "1D Curve",
+	[DRM_COLOROP_1D_LUT] = "1D Curve Custom LUT",
 	[DRM_COLOROP_CTM_3X4] = "3x4 Matrix"
 };
 
diff --git a/include/drm/drm_colorop.h b/include/drm/drm_colorop.h
index 28b3136dabad..8adc7ece3bd1 100644
--- a/include/drm/drm_colorop.h
+++ b/include/drm/drm_colorop.h
@@ -64,6 +64,13 @@ struct drm_colorop_state {
 	 */
 	enum drm_colorop_curve_1d_type curve_1d_type;
 
+	/**
+	 * @size:
+	 *
+	 * Number of entries of the custom LUT. This should be read-only.
+	 */
+	uint32_t size;
+
 	/**
 	 * @data:
 	 *
@@ -179,6 +186,13 @@ struct drm_colorop {
 	 */
 	struct drm_property *curve_1d_type_property;
 
+	/**
+	 * @size_property:
+	 *
+	 * Size property for custom LUT from userspace.
+	 */
+	struct drm_property *size_property;
+
 	/**
 	 * @data:
 	 *
@@ -228,6 +242,8 @@ int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
 
 int drm_colorop_curve_1d_init(struct drm_device *dev, struct drm_colorop *colorop,
 			      struct drm_plane *plane, u64 supported_tfs);
+int drm_colorop_curve_1d_lut_init(struct drm_device *dev, struct drm_colorop *colorop,
+				  struct drm_plane *plane, uint32_t lut_size);
 int drm_colorop_ctm_3x4_init(struct drm_device *dev, struct drm_colorop *colorop,
 			     struct drm_plane *plane);
 
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 1a8ea7934fbe..07fd66dc477c 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -874,6 +874,7 @@ struct drm_color_lut {
 
 enum drm_colorop_type {
 	DRM_COLOROP_1D_CURVE,
+	DRM_COLOROP_1D_LUT,
 	DRM_COLOROP_CTM_3X4,
 };
 
-- 
2.44.0