@@ -691,6 +691,10 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
if (old_connector_state->preferred_color_format !=
new_connector_state->preferred_color_format)
new_crtc_state->connectors_changed = true;
+
+ if (old_connector_state->preferred_color_range !=
+ new_connector_state->preferred_color_range)
+ new_crtc_state->connectors_changed = true;
}
if (funcs->atomic_check)
@@ -798,6 +798,8 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
state->max_requested_bpc = val;
} else if (property == connector->preferred_color_format_property) {
state->preferred_color_format = val;
+ } else if (property == connector->preferred_color_range_property) {
+ state->preferred_color_range = val;
} else if (connector->funcs->atomic_set_property) {
return connector->funcs->atomic_set_property(connector,
state, property, val);
@@ -877,6 +879,8 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
*val = state->max_requested_bpc;
} else if (property == connector->preferred_color_format_property) {
*val = state->preferred_color_format;
+ } else if (property == connector->preferred_color_range_property) {
+ *val = state->preferred_color_range;
} else if (connector->funcs->atomic_get_property) {
return connector->funcs->atomic_get_property(connector,
state, property, val);
@@ -905,6 +905,12 @@ static const struct drm_prop_enum_list drm_active_color_format_enum_list[] = {
{ DRM_COLOR_FORMAT_YCRCB420, "ycbcr420" },
};
+static const struct drm_prop_enum_list drm_preferred_color_range_enum_list[] = {
+ { DRM_MODE_COLOR_RANGE_UNSET, "Automatic" },
+ { DRM_MODE_COLOR_RANGE_FULL, "Full" },
+ { DRM_MODE_COLOR_RANGE_LIMITED_16_235, "Limited 16:235" },
+};
+
static const struct drm_prop_enum_list drm_active_color_range_enum_list[] = {
{ DRM_MODE_COLOR_RANGE_UNSET, "Not Applicable" },
{ DRM_MODE_COLOR_RANGE_FULL, "Full" },
@@ -1246,6 +1252,15 @@ static const struct drm_prop_enum_list dp_colorspaces[] = {
* property. Possible values are "not applicable", "rgb", "ycbcr444",
* "ycbcr422", and "ycbcr420".
*
+ * Broadcast RGB:
+ * This property is used by userspace to change the used color range. This
+ * property affects the RGB color format as well as the Y'CbCr color
+ * formats, if the driver supports both full and limited Y'CbCr. Drivers to
+ * use the function drm_connector_attach_preferred_color_format_property()
+ * to create and attach the property to the connector during
+ * initialization. Possible values are "Automatic", "Full", and "Limited
+ * 16:235".
+ *
* active color range:
* This read-only property tells userspace the color range actually used by
* the hardware display engine "on the cable" on a connector. The chosen
@@ -2331,6 +2346,37 @@ void drm_connector_set_active_color_format_property(struct drm_connector *connec
}
EXPORT_SYMBOL(drm_connector_set_active_color_format_property);
+/**
+ * drm_connector_attach_preferred_color_range_property - attach "Broadcast RGB" property
+ * @connector: connector to attach preferred color range property on.
+ *
+ * This is used to add support for selecting a color range on a connector.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_connector_attach_preferred_color_range_property(struct drm_connector *connector)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_property *prop;
+
+ if (!connector->preferred_color_range_property) {
+ prop = drm_property_create_enum(dev, 0, "Broadcast RGB",
+ drm_preferred_color_range_enum_list,
+ ARRAY_SIZE(drm_preferred_color_range_enum_list));
+ if (!prop)
+ return -ENOMEM;
+
+ connector->preferred_color_range_property = prop;
+ }
+
+ drm_object_attach_property(&connector->base, prop, DRM_MODE_COLOR_RANGE_UNSET);
+ connector->state->preferred_color_range = DRM_MODE_COLOR_RANGE_UNSET;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_connector_attach_preferred_color_range_property);
+
/**
* drm_connector_attach_active_color_range_property - attach "active color range" property
* @connector: connector to attach active color range property on.
@@ -809,6 +809,15 @@ struct drm_connector_state {
*/
u32 preferred_color_format;
+ /**
+ * preferred_color_range: Property set by userspace via "Broadcast RGB"
+ * property to tell the GPU driver which color range to use. It
+ * overwrites existing automatic detection mechanisms, if set and valid
+ * for the current color format. Userspace can check for (un-)successful
+ * application via the "active color range" property.
+ */
+ enum drm_mode_color_range preferred_color_range;
+
/**
* @hdr_output_metadata:
* DRM blob property for HDR output metadata
@@ -1426,6 +1435,12 @@ struct drm_connector {
*/
struct drm_property *active_color_format_property;
+ /**
+ * @preferred_color_range_property: Default connector property for the
+ * preferred color range to be driven out of the connector.
+ */
+ struct drm_property *preferred_color_range_property;
+
/**
* @active_color_range_property: Default connector property for the
* active color range to be driven out of the connector.
@@ -1760,6 +1775,7 @@ int drm_connector_attach_preferred_color_format_property(struct drm_connector *c
int drm_connector_attach_active_color_format_property(struct drm_connector *connector);
void drm_connector_set_active_color_format_property(struct drm_connector *connector,
u32 active_color_format);
+int drm_connector_attach_preferred_color_range_property(struct drm_connector *connector);
int drm_connector_attach_active_color_range_property(struct drm_connector *connector);
void drm_connector_set_active_color_range_property(struct drm_connector *connector,
enum drm_mode_color_range active_color_range);
Add "Broadcast RGB" to general drm context so that more drivers besides i915 and gma500 can implement it without duplicating code. Userspace can use this property to tell the graphic driver to use full or limited color range for a given connector, overwriting the default behaviour/automatic detection. Possible options are: - Automatic (default/current behaviour) - Full - Limited 16:235 In theory the driver should be able to automatically detect the monitors capabilities, but because of flawed standard implementations in Monitors, this might fail. In this case a manual overwrite is required to not have washed out colors or lose details in very dark or bright scenes. Signed-off-by: Werner Sembach <wse@tuxedocomputers.com> --- drivers/gpu/drm/drm_atomic_helper.c | 4 +++ drivers/gpu/drm/drm_atomic_uapi.c | 4 +++ drivers/gpu/drm/drm_connector.c | 46 +++++++++++++++++++++++++++++ include/drm/drm_connector.h | 16 ++++++++++ 4 files changed, 70 insertions(+)