[PATCH v4 3/7] drm: Add DisplayPort colorspace property

[Gwan-gyeong Mun]

In order to use colorspace property to Display Port connectors, it extends
DRM_MODE_CONNECTOR_DisplayPort connector_type on
drm_mode_create_colorspace_property function.

v3: Addressed review comments from Ville
    - Add new colorimetry options for DP 1.4a spec.
    - Separate set of colorimetry enum values for DP.
v4: Add additional comments to struct drm_prop_enum_list.
    Polishing an enum string of struct drm_prop_enum_list
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
Reviewed-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/drm_connector.c | 46 +++++++++++++++++++++++++++++++++
 include/drm/drm_connector.h     |  8 ++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 4c766624b20d..5834e6d330a0 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -882,6 +882,44 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
 	{ DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
 };
 
+/*
+ * As per DP 1.4a spec, 2.2.5.7.5 VSC SDP Payload for Pixel Encoding/Colorimetry
+ * Format Table 2-120
+ */
+static const struct drm_prop_enum_list dp_colorspaces[] = {
+	/* For Default case, driver will set the colorspace */
+	{ DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
+	/* Colorimetry based on IEC 61966-2-1 */
+	{ DRM_MODE_COLORIMETRY_SRGB, "sRGB" },
+	{ DRM_MODE_COLORIMETRY_WIDE_GAMUT_FIXED_POINT_RGB, "wide_gamut_fixed_point_RGB" },
+	/* Colorimetry based on IEC 61966-2-2, wide gamut floating point RGB */
+	{ DRM_MODE_COLORIMETRY_SCRGB, "scRGB" },
+	{ DRM_MODE_COLORIMETRY_ADOBE_RGB, "Adobe_RGB" },
+	/* Colorimetry based on SMPTE RP 431-2 */
+	{ DRM_MODE_COLORIMETRY_DCP_P3_RGB, "DCI-P3_RGB" },
+	/* Colorimetry based on ITU-R BT.2020 */
+	{ DRM_MODE_COLORIMETRY_BT2020_RGB, "BT2020_RGB" },
+	{ DRM_MODE_COLORIMETRY_BT601_YCC, "BT601_YCC" },
+	{ DRM_MODE_COLORIMETRY_BT709_YCC, "BT709_YCC" },
+	/* Standard Definition Colorimetry based on IEC 61966-2-4 */
+	{ DRM_MODE_COLORIMETRY_XVYCC_601, "XVYCC_601" },
+	/* High Definition Colorimetry based on IEC 61966-2-4 */
+	{ DRM_MODE_COLORIMETRY_XVYCC_709, "XVYCC_709" },
+	/* Colorimetry based on IEC 61966-2-1/Amendment 1 */
+	{ DRM_MODE_COLORIMETRY_SYCC_601, "SYCC_601" },
+	/* Colorimetry based on IEC 61966-2-5 [33] */
+	{ DRM_MODE_COLORIMETRY_OPYCC_601, "opYCC_601" },
+	/* Colorimetry based on ITU-R BT.2020 */
+	{ DRM_MODE_COLORIMETRY_BT2020_CYCC, "BT2020_CYCC" },
+	/* Colorimetry based on ITU-R BT.2020 */
+	{ DRM_MODE_COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
+	/*
+	 * Colorumetry based on Digital Imaging and Communications in Medicine
+	 * (DICOM) Part 14: Grayscale Standard Display Function
+	 */
+	{ DRM_MODE_COLORIMETRY_DICOM_PART_14_GRAYSCALE, "DICOM_Part_14_Grayscale" },
+};
+
 /**
  * DOC: standard connector properties
  *
@@ -1710,6 +1748,14 @@ int drm_mode_create_colorspace_property(struct drm_connector *connector)
 						ARRAY_SIZE(hdmi_colorspaces));
 		if (!prop)
 			return -ENOMEM;
+	} else if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+		   connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+		prop = drm_property_create_enum(dev, DRM_MODE_PROP_ENUM,
+						"Colorspace",
+						dp_colorspaces,
+						ARRAY_SIZE(dp_colorspaces));
+		if (!prop)
+			return -ENOMEM;
 	} else {
 		DRM_DEBUG_KMS("Colorspace property not supported\n");
 		return 0;
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 681cb590f952..8848e5d6b0c4 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -281,6 +281,14 @@ enum drm_panel_orientation {
 /* Additional Colorimetry extension added as part of CTA 861.G */
 #define DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65		11
 #define DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER		12
+/* Additional Colorimetry Options added for DP 1.4a VSC Colorimetry Format */
+#define DRM_MODE_COLORIMETRY_SRGB			13
+#define DRM_MODE_COLORIMETRY_WIDE_GAMUT_FIXED_POINT_RGB	14
+#define DRM_MODE_COLORIMETRY_SCRGB			15
+#define DRM_MODE_COLORIMETRY_ADOBE_RGB			16
+#define DRM_MODE_COLORIMETRY_DCP_P3_RGB			17
+#define DRM_MODE_COLORIMETRY_BT601_YCC			18
+#define DRM_MODE_COLORIMETRY_DICOM_PART_14_GRAYSCALE	19
 
 /**
  * enum drm_bus_flags - bus_flags info for &drm_display_info
-- 
2.23.0