From: Jyri Sarha <jsa...@ti.com>

Add a standard optional 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.

v2: Add/fix kerneldocs, verify bitmasks (danvet)

Cc: Harry Wentland <harry.wentl...@amd.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Daniel Stone <dan...@fooishbar.org>
Cc: Russell King - ARM Linux <li...@armlinux.org.uk>
Cc: Ilia Mirkin <imir...@alum.mit.edu>
Cc: Hans Verkuil <hverk...@xs4all.nl>
Cc: Uma Shankar <uma.shan...@intel.com>
Cc: Shashank Sharma <shashank.sha...@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Signed-off-by: Jyri Sarha <jsa...@ti.com>
[vsyrjala v2: Add/fix kerneldocs, verify bitmasks]
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/drm_atomic.c     |   8 +++
 drivers/gpu/drm/drm_color_mgmt.c | 103 +++++++++++++++++++++++++++++++++++++++
 include/drm/drm_color_mgmt.h     |  19 ++++++++
 include/drm/drm_plane.h          |  32 ++++++++++++
 4 files changed, 162 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 46733d534587..452a0b0bafbc 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -759,6 +759,10 @@ static 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);
@@ -818,6 +822,10 @@ drm_atomic_plane_get_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 0d002b045bd2..4b83e078d3e9 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -88,6 +88,20 @@
  * 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.
+ *
+ * Support for different non RGB color encodings is controlled through
+ * &drm_plane specific COLOR_ENCODING and COLOR_RANGE properties. They
+ * are set up by calling drm_plane_create_color_properties().
+ *
+ * "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.
  */
 
 /**
@@ -339,3 +353,92 @@ int drm_mode_gamma_get_ioctl(struct drm_device *dev,
        drm_modeset_unlock(&crtc->mutex);
        return ret;
 }
+
+static const char * const 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 const char * const 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
+ * @plane: plane object
+ * @supported_encodings: bitfield indicating supported color encodings
+ * @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 @plane. The supported encodings and ranges should
+ * be provided in supported_encodings and supported_ranges bitmasks.
+ * Each bit set in the bitmask indicates that its number as enum
+ * value is 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)];
+       int i, len;
+
+       if (WARN_ON(supported_encodings == 0 ||
+                   (supported_encodings & -BIT(DRM_COLOR_ENCODING_MAX)) != 0 ||
+                   (supported_encodings & BIT(default_encoding)) == 0))
+               return -EINVAL;
+
+       if (WARN_ON(supported_ranges == 0 ||
+                   (supported_ranges & -BIT(DRM_COLOR_RANGE_MAX)) != 0 ||
+                   (supported_ranges & BIT(default_range)) == 0))
+               return -EINVAL;
+
+       len = 0;
+       for (i = 0; i < DRM_COLOR_ENCODING_MAX; i++) {
+               if ((supported_encodings & BIT(i)) == 0)
+                       continue;
+
+               enum_list[len].type = i;
+               enum_list[len].name = color_encoding_name[i];
+               len++;
+       }
+
+       prop = drm_property_create_enum(dev, 0, "COLOR_ENCODING",
+                                       enum_list, len);
+       if (!prop)
+               return -ENOMEM;
+       plane->color_encoding_property = prop;
+       drm_object_attach_property(&plane->base, prop, default_encoding);
+       if (plane->state)
+               plane->state->color_encoding = default_encoding;
+
+       len = 0;
+       for (i = 0; i < DRM_COLOR_RANGE_MAX; i++) {
+               if ((supported_ranges & BIT(i)) == 0)
+                       continue;
+
+               enum_list[len].type = i;
+               enum_list[len].name = color_range_name[i];
+               len++;
+       }
+
+       prop = drm_property_create_enum(dev, 0, "COLOR_RANGE",
+                                       enum_list, len);
+       if (!prop)
+               return -ENOMEM;
+       plane->color_range_property = prop;
+       drm_object_attach_property(&plane->base, prop, default_range);
+       if (plane->state)
+               plane->state->color_range = default_range;
+
+       return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_color_properties);
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 03a59cbce621..b3b6d302ca8c 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -26,6 +26,7 @@
 #include <linux/ctype.h>
 
 struct drm_crtc;
+struct drm_plane;
 
 uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision);
 
@@ -37,4 +38,22 @@ 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,
+       DRM_COLOR_YCBCR_BT709,
+       DRM_COLOR_YCBCR_BT2020,
+       DRM_COLOR_ENCODING_MAX,
+};
+
+enum drm_color_range {
+       DRM_COLOR_YCBCR_LIMITED_RANGE,
+       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 8185e3468a23..f7bf4a48b1c3 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 +113,20 @@ struct drm_plane_state {
        unsigned int zpos;
        unsigned int normalized_zpos;
 
+       /**
+        * @color_encoding:
+        *
+        * Color encoding for non RGB formats
+        */
+       enum drm_color_encoding color_encoding;
+
+       /**
+        * @color_range:
+        *
+        * Color range for non RGB formats
+        */
+       enum drm_color_range color_range;
+
        /* Clipped coordinates */
        struct drm_rect src, dst;
 
@@ -558,6 +573,23 @@ struct drm_plane {
 
        struct drm_property *zpos_property;
        struct drm_property *rotation_property;
+
+       /**
+        * @color_encoding_property:
+        *
+        * Optional "COLOR_ENCODING" enum property for specifying
+        * color encoding for non RGB formats.
+        * See drm_plane_create_color_properties().
+        */
+       struct drm_property *color_encoding_property;
+       /**
+        * @color_range_property:
+        *
+        * Optional "COLOR_RANGE" enum property for specifying
+        * color range for non RGB formats.
+        * See drm_plane_create_color_properties().
+        */
+       struct drm_property *color_range_property;
 };
 
 #define obj_to_plane(x) container_of(x, struct drm_plane, base)
-- 
2.13.6

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