Add a standard optinal properties to support different non RGB color
encodings in DRM planes. COLOR_ENCODING select the supported non RGB
color encoding, for instance ITU-R BT.709 YCbCr. COLOR_RANGE selects
the value ranges within the selected color encoding. The properties
are stored to drm_plane object to allow different set of supported
encoding for different planes on the device.
Signed-off-by: Jyri Sarha <jsarha@xxxxxx>
---
drivers/gpu/drm/drm_atomic.c | 8 ++++
drivers/gpu/drm/drm_color_mgmt.c | 97 ++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_plane.c | 6 +++
include/drm/drm_color_mgmt.h | 20 +++++++++
include/drm/drm_plane.h | 8 ++++
5 files changed, 139 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 4033384..f341dda 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -774,6 +774,10 @@ int drm_atomic_plane_set_property(struct drm_plane *plane,
state->rotation = val;
} else if (property == plane->zpos_property) {
state->zpos = val;
+ } else if (property == plane->color_encoding_property) {
+ state->color_encoding = val;
+ } else if (property == plane->color_range_property) {
+ state->color_range = val;
} else if (plane->funcs->atomic_set_property) {
return plane->funcs->atomic_set_property(plane, state,
property, val);
@@ -834,6 +838,10 @@ int drm_atomic_plane_set_property(struct drm_plane *plane,
*val = state->rotation;
} else if (property == plane->zpos_property) {
*val = state->zpos;
+ } else if (property == plane->color_encoding_property) {
+ *val = state->color_encoding;
+ } else if (property == plane->color_range_property) {
+ *val = state->color_range;
} else if (plane->funcs->atomic_get_property) {
return plane->funcs->atomic_get_property(plane, state, property, val);
} else {
diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 533f3a3..2e04ebb 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -33,6 +33,11 @@
* properties on the &drm_crtc object. They are set up by calling
* drm_crtc_enable_color_mgmt().
*
+ * Support for different non RGB color encodings is controlled trough
+ * plane specific COLOR_ENCODING and COLOR_RANGE properties.
+ *
+ * The &drm_crtc object's properties are:
+ *
* "DEGAMMA_LUT”:
* Blob property to set the degamma lookup table (LUT) mapping pixel data
* from the framebuffer before it is given to the transformation matrix.
@@ -85,6 +90,18 @@
* drm_mode_crtc_set_gamma_size(). Drivers which support both should use
* drm_atomic_helper_legacy_gamma_set() to alias the legacy gamma ramp with the
* "GAMMA_LUT" property above.
+ *
+ * The &drm_plane object's properties are:
+ *
+ * "COLOR_ENCODING"
+ * Optional plane enum property to support different non RGB
+ * color encodings. The driver can provide a subset of standard
+ * enum values supported by the DRM plane.
+ *
+ * "COLOR_RANGE"
+ * Optional plane enum property to support different non RGB
+ * color parameter ranges. The driver can provide a subset of
+ * standard enum values supported by the DRM plane.
*/
/**
@@ -333,3 +350,83 @@ int drm_mode_gamma_get_ioctl(struct drm_device *dev,
drm_modeset_unlock(&crtc->mutex);
return ret;
}
+
+static char *color_encoding_name[] = {
+ [DRM_COLOR_YCBCR_BT601] = "ITU-R BT.601 YCbCr",
+ [DRM_COLOR_YCBCR_BT709] = "ITU-R BT.709 YCbCr",
+ [DRM_COLOR_YCBCR_BT2020] = "ITU-R BT.2020 YCbCr",
+};
+
+static char *color_range_name[] = {
+ [DRM_COLOR_YCBCR_FULL_RANGE] = "YCbCr FULL RANGE",
+ [DRM_COLOR_YCBCR_LIMITED_RANGE] = "YCbCr LIMITED RANGE",
+};
+
+/**
+ * drm_plane_create_color_properties - color encoding related plane properties
+ * @supported_encodings: bitfield indicating supported color encdings
+ * @supported_ranges: bitfileld indicating supported color ranges
+ * @default_encoding: default color encoding
+ * @default_range: default color range
+ *
+ * Create and attach plane specific COLOR_ENCODING and COLOR_RANGE
+ * properties to to the drm_plane object. The supported encodings and
+ * ranges should be provided in supported_encodings and
+ * supported_ranges bitmasks. Each bit set in the bitmast indicates
+ * the its number as enum value being supported.
+ */
+int drm_plane_create_color_properties(struct drm_plane *plane,
+ u32 supported_encodings,
+ u32 supported_ranges,
+ enum drm_color_encoding default_encoding,
+ enum drm_color_range default_range)
+{
+ struct drm_device *dev = plane->dev;
+ struct drm_property *prop;
+ struct drm_prop_enum_list enum_list[max(DRM_COLOR_ENCODING_MAX,
+ DRM_COLOR_RANGE_MAX)];
+ unsigned int i, len;
+
+
+ if (WARN_ON(plane->color_encoding_property != NULL) ||
+ WARN_ON(plane->color_range_property != NULL))
+ return -EEXIST;
+
+ len = 0;
+ for (i = 0; i < DRM_COLOR_ENCODING_MAX; i++) {
+ if ((BIT(i) & supported_encodings) == 0)
+ continue;
+
+ enum_list[i].type = i;
+ enum_list[i].name = color_encoding_name[i];
+ len++;
+ }
+
+ prop = drm_property_create_enum(dev, DRM_MODE_PROP_ATOMIC,
+ "COLOR_ENCODING",
+ enum_list, len);
+ if (!prop)
+ return -ENOMEM;
+ plane->color_encoding_property = prop;
+ drm_object_attach_property(&plane->base, prop, default_encoding);
+
+ len = 0;
+ for (i = 0; i < DRM_COLOR_RANGE_MAX; i++) {
+ if ((BIT(i) & supported_ranges) == 0)
+ continue;
+
+ enum_list[i].type = i;
+ enum_list[i].name = color_range_name[i];
+ len++;
+ }
+
+ prop = drm_property_create_enum(dev, DRM_MODE_PROP_ATOMIC,
+ "COLOR_RANGE",
+ enum_list, len);
+ if (!prop)
+ return -ENOMEM;
+ plane->color_range_property = prop;
+ drm_object_attach_property(&plane->base, prop, default_range);
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index fedd4d6..a6762e8 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -244,6 +244,12 @@ void drm_plane_cleanup(struct drm_plane *plane)
kfree(plane->name);
+ if (plane->color_encoding_property)
+ drm_property_destroy(dev, plane->color_encoding_property);
+
+ if (plane->color_range_property)
+ drm_property_destroy(dev, plane->color_range_property);
+
memset(plane, 0, sizeof(*plane));
}
EXPORT_SYMBOL(drm_plane_cleanup);
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 03a59cb..7a1af63 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -26,6 +26,8 @@
#include <linux/ctype.h>
struct drm_crtc;
+struct drm_plane;
+struct drm_prop_enum_list;
uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision);
@@ -37,4 +39,22 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
int gamma_size);
+enum drm_color_encoding {
+ DRM_COLOR_YCBCR_BT601 = 0,
+ DRM_COLOR_YCBCR_BT709,
+ DRM_COLOR_YCBCR_BT2020,
+ DRM_COLOR_ENCODING_MAX,
+};
+
+enum drm_color_range {
+ DRM_COLOR_YCBCR_LIMITED_RANGE = 0,
+ DRM_COLOR_YCBCR_FULL_RANGE,
+ DRM_COLOR_RANGE_MAX,
+};
+
+int drm_plane_create_color_properties(struct drm_plane *plane,
+ u32 supported_encodings,
+ u32 supported_ranges,
+ enum drm_color_encoding default_encoding,
+ enum drm_color_range default_range);
#endif
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 9ab3e70..f4de5f9 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -26,6 +26,7 @@
#include <linux/list.h>
#include <linux/ctype.h>
#include <drm/drm_mode_object.h>
+#include <drm/drm_color_mgmt.h>
struct drm_crtc;
struct drm_printer;
@@ -112,6 +113,10 @@ struct drm_plane_state {
unsigned int zpos;
unsigned int normalized_zpos;
+ /* Color encoding for non RGB formats */
+ enum drm_color_encoding color_encoding;
+ enum drm_color_range color_range;
+
/* Clipped coordinates */
struct drm_rect src, dst;
@@ -523,6 +528,9 @@ struct drm_plane {
struct drm_property *zpos_property;
struct drm_property *rotation_property;
+
+ struct drm_property *color_encoding_property;
+ struct drm_property *color_range_property;
};
#define obj_to_plane(x) container_of(x, struct drm_plane, base)
--
1.9.1
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