[PATCH] drm: parse color format support for digital displays

[Jesse Barnes]

EDID 1.4 digital displays report the color spaces they support in the
features block.  Add support for grabbing this data and stuffing it into
the display_info struct for driver use.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/drm_edid.c |    6 ++++++
 include/drm/drm_crtc.h     |    5 ++++-
 include/drm/drm_edid.h     |    8 ++++++++
 3 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 3518e1e..0a9357c 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1462,6 +1462,12 @@ static void drm_add_display_info(struct edid *edid,
 		info->bpc = 0;
 		break;
 	}
+
+	info->color_formats = DRM_COLOR_FORMAT_RGB444;
+	if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444)
+		info->color_formats = DRM_COLOR_FORMAT_YCRCB444;
+	if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422)
+		info->color_formats = DRM_COLOR_FORMAT_YCRCB422;
 }
 
 /**
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 4d8fbb0..b786a24 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -183,7 +183,9 @@ enum subpixel_order {
 	SubPixelNone,
 };
 
-
+#define DRM_COLOR_FORMAT_RGB444		(1<<0)
+#define DRM_COLOR_FORMAT_YCRCB444	(1<<1)
+#define DRM_COLOR_FORMAT_YCRCB422	(1<<2)
 /*
  * Describes a given display (e.g. CRT or flat panel) and its limitations.
  */
@@ -201,6 +203,7 @@ struct drm_display_info {
 	unsigned int bpc;
 
 	enum subpixel_order subpixel_order;
+	u32 color_formats;
 
 	char *raw_edid; /* if any */
 };
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 9b9bf94..eacb415 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -175,7 +175,15 @@ struct detailed_timing {
 #define DRM_EDID_FEATURE_DEFAULT_GTF      (1 << 0)
 #define DRM_EDID_FEATURE_PREFERRED_TIMING (1 << 1)
 #define DRM_EDID_FEATURE_STANDARD_COLOR   (1 << 2)
+/* If analog */
 #define DRM_EDID_FEATURE_DISPLAY_TYPE     (3 << 3) /* 00=mono, 01=rgb, 10=non-rgb, 11=unknown */
+/* If digital */
+#define DRM_EDID_FEATURE_COLOR_MASK	  (3 << 3)
+#define DRM_EDID_FEATURE_RGB		  (0 << 3)
+#define DRM_EDID_FEATURE_RGB_YCRCB444	  (1 << 3)
+#define DRM_EDID_FEATURE_RGB_YCRCB422	  (2 << 3)
+#define DRM_EDID_FEATURE_RGB_YCRCB	  (3 << 3) /* both 4:4:4 and 4:2:2 */
+
 #define DRM_EDID_FEATURE_PM_ACTIVE_OFF    (1 << 5)
 #define DRM_EDID_FEATURE_PM_SUSPEND       (1 << 6)
 #define DRM_EDID_FEATURE_PM_STANDBY       (1 << 7)
-- 
1.7.4.1