drm/connector: Convert DRM_MODE_COLORIMETRY to enum

This allows us to use strongly typed arguments.

v2:
 - Bring NO_DATA back
 - Provide explicit enum values

v3:
- Drop unnecessary '&' from kerneldoc (emersion)

v4:
- Fix Normal Colorimetry comment

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Sebastian Wick <sebastian.wick@redhat.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Joshua Ashton <joshua@froggi.es>

Cc: Pekka Paalanen <ppaalanen@gmail.com>
Cc: Sebastian Wick <sebastian.wick@redhat.com>
Cc: Vitaly.Prosyak@amd.com
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Joshua Ashton <joshua@froggi.es>
Cc: Simon Ser <contact@emersion.fr>
Cc: Melissa Wen <mwen@igalia.com>
Cc: dri-devel@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Harry Wentland

include/drm/display/drm_dp.h

@@ -1636,7 +1636,7 @@ enum dp_pixelformat {
  *
  * This enum is used to indicate DP VSC SDP Colorimetry formats.
  * It is based on DP 1.4 spec [Table 2-117: VSC SDP Payload for DB16 through
- * DB18] and a name of enum member follows DRM_MODE_COLORIMETRY definition.
+ * DB18] and a name of enum member follows enum drm_colorimetry definition.
  *
  * @DP_COLORIMETRY_DEFAULT: sRGB (IEC 61966-2-1) or
  *                          ITU-R BT.601 colorimetry format

include/drm/drm_connector.h

@@ -427,29 +427,30 @@ enum drm_privacy_screen_status {
  * a colorspace property which will be created and exposed to
  * userspace.
  */
-
-/* For Default case, driver will set the colorspace */
-#define DRM_MODE_COLORIMETRY_DEFAULT			0
-/* CEA 861 Normal Colorimetry options */
-#define DRM_MODE_COLORIMETRY_NO_DATA			0
-#define DRM_MODE_COLORIMETRY_SMPTE_170M_YCC		1
-#define DRM_MODE_COLORIMETRY_BT709_YCC			2
-/* CEA 861 Extended Colorimetry Options */
-#define DRM_MODE_COLORIMETRY_XVYCC_601			3
-#define DRM_MODE_COLORIMETRY_XVYCC_709			4
-#define DRM_MODE_COLORIMETRY_SYCC_601			5
-#define DRM_MODE_COLORIMETRY_OPYCC_601			6
-#define DRM_MODE_COLORIMETRY_OPRGB			7
-#define DRM_MODE_COLORIMETRY_BT2020_CYCC		8
-#define DRM_MODE_COLORIMETRY_BT2020_RGB			9
-#define DRM_MODE_COLORIMETRY_BT2020_YCC			10
-/* 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_RGB_WIDE_FIXED		13
-#define DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT		14
-#define DRM_MODE_COLORIMETRY_BT601_YCC			15
+enum drm_colorspace {
+	/* For Default case, driver will set the colorspace */
+	DRM_MODE_COLORIMETRY_DEFAULT 		= 0,
+	/* CEA 861 Normal Colorimetry options */
+	DRM_MODE_COLORIMETRY_NO_DATA		= 0,
+	DRM_MODE_COLORIMETRY_SMPTE_170M_YCC	= 1,
+	DRM_MODE_COLORIMETRY_BT709_YCC		= 2,
+	/* CEA 861 Extended Colorimetry Options */
+	DRM_MODE_COLORIMETRY_XVYCC_601		= 3,
+	DRM_MODE_COLORIMETRY_XVYCC_709		= 4,
+	DRM_MODE_COLORIMETRY_SYCC_601		= 5,
+	DRM_MODE_COLORIMETRY_OPYCC_601		= 6,
+	DRM_MODE_COLORIMETRY_OPRGB		= 7,
+	DRM_MODE_COLORIMETRY_BT2020_CYCC	= 8,
+	DRM_MODE_COLORIMETRY_BT2020_RGB		= 9,
+	DRM_MODE_COLORIMETRY_BT2020_YCC		= 10,
+	/* Additional Colorimetry extension added as part of CTA 861.G */
+	DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65	= 11,
+	DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER	= 12,
+	/* Additional Colorimetry Options added for DP 1.4a VSC Colorimetry Format */
+	DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED	= 13,
+	DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT	= 14,
+	DRM_MODE_COLORIMETRY_BT601_YCC		= 15,
+};
 
 /**
  * enum drm_bus_flags - bus_flags info for &drm_display_info
@@ -901,7 +902,7 @@ struct drm_connector_state {
 	 * colorspace change on Sink. This is most commonly used to switch
 	 * to wider color gamuts like BT2020.
 	 */
-	u32 colorspace;
+	enum drm_colorspace colorspace;
 
 	/**
 	 * @writeback_job: Writeback job for writeback connectors