[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 |   10 ++++++++++
 include/drm/drm_crtc.h     |    6 +++++-
 2 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fb5ebd9..64f8b7f 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1429,6 +1429,7 @@ static void drm_add_display_info(struct edid *edid,
 
 	/* driver figures it out in this case */
 	info->bpp = 0;
+	info->color_formats = 0;
 
 	/* Only defined for 1.4 with digital displays */
 	if (edid->revision < 4)
@@ -1461,6 +1462,15 @@ static void drm_add_display_info(struct edid *edid,
 		info->bpp = 0;
 		break;
 	}
+
+	if (edid->features & DRM_EDID_FEATURE_RGB)
+		info->color_formats = DRM_COLOR_FORMAT_RGB444;
+	else if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
+		info->color_formats = DRM_COLOR_FORMAT_RGB444 |
+			DRM_COLOR_FORMAT_YCRCB444;
+	else if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB)
+		info->color_formats = DRM_COLOR_FORMAT_RGB444 |
+			DRM_COLOR_FORMAT_YCRCB444 | DRM_COLOR_FORMAT_YCRCB422;
 }
 
 /**
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index aaec097..5cc7008 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.
  */
@@ -198,8 +200,10 @@ struct drm_display_info {
 	unsigned int min_vfreq, max_vfreq;
 	unsigned int min_hfreq, max_hfreq;
 	unsigned int pixel_clock;
+	unsigned int bpp;
 
 	enum subpixel_order subpixel_order;
+	unsigned long color_formats;
 
 	char *raw_edid; /* if any */
 };
-- 
1.7.4.1