[v2 1/2] drm: Add colorspace property

[Uma Shankar <uma.shankar@intel.com>]

This patch adds a colorspace property enabling
userspace to switch to various supported colorspaces.
This will help enable BT2020 along with other colorspaces.

v2: Addressed Maarten and Ville's review comments. Enhanced
the colorspace enum to incorporate both HDMI and DP supported
colorspaces. Also, added a default option for colorspace.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/drm_atomic_uapi.c |  4 ++++
 drivers/gpu/drm/drm_connector.c   | 44 +++++++++++++++++++++++++++++++++++++++
 include/drm/drm_connector.h       |  7 +++++++
 include/drm/drm_mode_config.h     |  6 ++++++
 include/uapi/drm/drm_mode.h       | 24 +++++++++++++++++++++
 5 files changed, 85 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index d5b7f31..9e1d46b 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -721,6 +721,8 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
 		state->picture_aspect_ratio = val;
 	} else if (property == config->content_type_property) {
 		state->content_type = val;
+	} else if (property == config->colorspace_property) {
+		state->colorspace = val;
 	} else if (property == connector->scaling_mode_property) {
 		state->scaling_mode = val;
 	} else if (property == connector->content_protection_property) {
@@ -795,6 +797,8 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
 		*val = state->picture_aspect_ratio;
 	} else if (property == config->content_type_property) {
 		*val = state->content_type;
+	} else if (property == config->colorspace_property) {
+		*val = state->colorspace;
 	} else if (property == connector->scaling_mode_property) {
 		*val = state->scaling_mode;
 	} else if (property == connector->content_protection_property) {
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index aa18b1d..5ad52a0 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -826,6 +826,38 @@ int drm_display_info_set_bus_formats(struct drm_display_info *info,
 };
 DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list)
 
+static const struct drm_prop_enum_list colorspace[] = {
+	/* Standard Definition Colorimetry based on CEA 861 */
+	{ COLORIMETRY_ITU_601, "601" },
+	{ COLORIMETRY_ITU_709, "709" },
+	/* Standard Definition Colorimetry based on IEC 61966-2-4 */
+	{ COLORIMETRY_XV_YCC_601, "601" },
+	/* High Definition Colorimetry based on IEC 61966-2-4 */
+	{ COLORIMETRY_XV_YCC_709, "709" },
+	/* Colorimetry based on IEC 61966-2-1/Amendment 1 */
+	{ COLORIMETRY_S_YCC_601, "s601" },
+	/* Colorimetry based on IEC 61966-2-5 [33] */
+	{ COLORIMETRY_ADOBE_YCC_601, "adobe601" },
+	/* Colorimetry based on IEC 61966-2-5 */
+	{ COLORIMETRY_ADOBE_RGB, "adobe_rgb" },
+	/* Colorimetry based on ITU-R BT.2020 */
+	{ COLORIMETRY_BT2020_RGB, "BT2020_rgb" },
+	/* Colorimetry based on ITU-R BT.2020 */
+	{ COLORIMETRY_BT2020_YCC, "BT2020_ycc" },
+	/* Colorimetry based on ITU-R BT.2020 */
+	{ COLORIMETRY_BT2020_CYCC, "BT2020_cycc" },
+	/* DP MSA Colorimetry */
+	{ COLORIMETRY_Y_CBCR_ITU_601, "YCBCR_ITU_601" },
+	{ COLORIMETRY_Y_CBCR_ITU_709, "YCBCR_ITU_709" },
+	{ COLORIMETRY_SRGB, "SRGB" },
+	{ COLORIMETRY_RGB_WIDE_GAMUT, "RGB Wide Gamut" },
+	{ COLORIMETRY_SCRGB, "SCRGB" },
+	{ COLORIMETRY_DCI_P3, "DCIP3" },
+	{ COLORIMETRY_CUSTOM_COLOR_PROFILE, "Custom Proflie" },
+	/* FOR HD 720p+, Default Colorimetry is based on ITU-R BT.709 */
+	{ COLORIMETRY_DEFAULT, "Default: ITU_709" },
+};
+
 /**
  * DOC: standard connector properties
  *
@@ -972,6 +1004,12 @@ int drm_display_info_set_bus_formats(struct drm_display_info *info,
  *	can also expose this property to external outputs, in which case they
  *	must support "None", which should be the default (since external screens
  *	have a built-in scaler).
+ *
+ * colorspace:
+ *	This property helps select a suitable colorspace based on the sink
+ *	capability. Modern sink devices support wider gamut like BT2020.
+ *	This helps switch to BT2020 mode if the BT2020 encoded video stream
+ *	is being played by the user, same for any other colorspace.
  */
 
 int drm_connector_create_standard_properties(struct drm_device *dev)
@@ -1020,6 +1058,12 @@ int drm_connector_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.non_desktop_property = prop;
 
+	prop = drm_property_create_enum(dev, DRM_MODE_PROP_ENUM, "Colorspace",
+					colorspace, ARRAY_SIZE(colorspace));
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.colorspace_property = prop;
+
 	return 0;
 }
 
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index dd0552c..b7f5373 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -497,6 +497,13 @@ struct drm_connector_state {
 	unsigned int content_protection;
 
 	/**
+	 * @colorspace: Connector property to request colorspace
+	 * change. This is most commonly used to switch to wider color
+	 * gamuts like BT2020.
+	 */
+	enum encoder_colorimetry colorspace;
+
+	/**
 	 * @writeback_job: Writeback job for writeback connectors
 	 *
 	 * Holds the framebuffer and out-fence for a writeback connector. As
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index d643d26..a6eb0aa 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -863,6 +863,12 @@ struct drm_mode_config {
 	uint32_t cursor_width, cursor_height;
 
 	/**
+	 * @colorspace_property: Connector property to set the suitable
+	 * colorspace supported by the sink.
+	 */
+	struct drm_property *colorspace_property;
+
+	/**
 	 * @suspend_state:
 	 *
 	 * Atomic state when suspended.
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index d3e0fe3..831cc77 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -210,6 +210,30 @@
 #define DRM_MODE_CONTENT_PROTECTION_DESIRED     1
 #define DRM_MODE_CONTENT_PROTECTION_ENABLED     2
 
+enum encoder_colorimetry {
+	/* CEA 861 Normal Colorimetry options */
+	COLORIMETRY_ITU_601 = 0,
+	COLORIMETRY_ITU_709,
+	/* CEA 861 Extended Colorimetry Options */
+	COLORIMETRY_XV_YCC_601,
+	COLORIMETRY_XV_YCC_709,
+	COLORIMETRY_S_YCC_601,
+	COLORIMETRY_ADOBE_YCC_601,
+	COLORIMETRY_ADOBE_RGB,
+	COLORIMETRY_BT2020_RGB,
+	COLORIMETRY_BT2020_YCC,
+	COLORIMETRY_BT2020_CYCC,
+	/* DP MSA Colorimetry Options */
+	COLORIMETRY_Y_CBCR_ITU_601,
+	COLORIMETRY_Y_CBCR_ITU_709,
+	COLORIMETRY_SRGB,
+	COLORIMETRY_RGB_WIDE_GAMUT,
+	COLORIMETRY_SCRGB,
+	COLORIMETRY_DCI_P3,
+	COLORIMETRY_CUSTOM_COLOR_PROFILE,
+	COLORIMETRY_DEFAULT = COLORIMETRY_ITU_709,
+};
+
 struct drm_mode_modeinfo {
 	__u32 clock;
 	__u16 hdisplay;
-- 
1.9.1

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