From: Alex Hung <alex.hung@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
Co-developed-by: Harry Wentland <harry.wentland@xxxxxxx>
---
v5:
- Add kernel doc
- Define SIZE in similar manner to GAMMA_SIZE on drm_crtc (Melissa)
drivers/gpu/drm/drm_atomic.c | 4 +++
drivers/gpu/drm/drm_atomic_uapi.c | 5 ++++
drivers/gpu/drm/drm_colorop.c | 47 +++++++++++++++++++++++++++++--
include/drm/drm_colorop.h | 16 +++++++++++
include/uapi/drm/drm_mode.h | 9 ++++++
5 files changed, 79 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index c58663327e6b..f06b1d5a61ed 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -793,6 +793,10 @@ 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 fafbaa73b95f..2b7368b337a4 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 d6af7910ffc0..1d3fef74a30e 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -63,6 +63,7 @@
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"}
};
@@ -218,12 +219,53 @@ 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;
}
+/**
+ * drm_colorop_curve_1d_lut_init - Initialize a DRM_COLOROP_1D_LUT
+ *
+ * @dev: DRM device
+ * @colorop: The drm_colorop object to initialize
+ * @plane: The associated drm_plane
+ * @lut_size: LUT size supported by driver
+ * @return zero on success, -E value on failure
+ */
+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_IMMUTABLE, "SIZE",
+ 0, UINT_MAX);
+ if (!prop)
+ return -ENOMEM;
+
+ colorop->size_property = prop;
+ drm_object_attach_property(&colorop->base, colorop->size_property, lut_size);
+
+ /* 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)
{
@@ -332,6 +374,7 @@ void drm_colorop_reset(struct drm_colorop *colorop)
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 ca3a480db787..32973ad99f8c 100644
--- a/include/drm/drm_colorop.h
+++ b/include/drm/drm_colorop.h
@@ -133,6 +133,13 @@ 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:
*
@@ -245,6 +252,13 @@ 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_property:
*
@@ -291,6 +305,8 @@ static inline struct drm_colorop *drm_colorop_find(struct drm_device *dev,
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 6fc1ce24800a..40cc5c661cff 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -888,6 +888,15 @@ enum drm_colorop_type {
*/
DRM_COLOROP_1D_CURVE,
+ /**
+ * @DRM_COLOROP_1D_LUT:
+ *
+ * A simple 1D LUT of uniformly spaced &drm_color_lut entries,
+ * packed into a blob via the DATA property. The driver's expected
+ * LUT size is advertised via the SIZE property.
+ */
+ DRM_COLOROP_1D_LUT,
+
/**
* @DRM_COLOROP_CTM_3X4:
*
--
2.46.2
