[PATCH v4 05/15] drm/edid: parse ycbcr 420 deep color information

[Shashank Sharma]

CEA-861-F spec adds ycbcr420 deep color support information
in hf-vsdb block. This patch extends the existing hf-vsdb parsing
function by adding parsing of ycbcr420 deep color support from the
EDID and adding it into display information stored.

V2: Rebase
V3: Rebase
V4: Moved definition of y420_dc_modes into this patch, where its used
    (Ville)

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jose Abreu <joabreu at synopsys.com>
Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/drm_edid.c  | 15 +++++++++++++++
 include/drm/drm_connector.h |  3 +++
 include/drm/drm_edid.h      |  5 +++++
 3 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 8c7e73b..b4583f6 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4196,6 +4196,19 @@ drm_default_rgb_quant_range(const struct drm_display_mode *mode)
 }
 EXPORT_SYMBOL(drm_default_rgb_quant_range);
 
+static void drm_parse_ycbcr420_deep_color_info(struct drm_connector *connector,
+					     const u8 *db)
+{
+	struct drm_hdmi_info *info = &connector->display_info.hdmi;
+
+	if (db[7] & DRM_EDID_YCBCR420_DC_48)
+		info->y420_dc_modes |= DRM_EDID_YCBCR420_DC_48;
+	if (db[7] & DRM_EDID_YCBCR420_DC_36)
+		info->y420_dc_modes |= DRM_EDID_YCBCR420_DC_36;
+	if (db[7] & DRM_EDID_YCBCR420_DC_30)
+		info->y420_dc_modes |= DRM_EDID_YCBCR420_DC_30;
+}
+
 static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
 				 const u8 *hf_vsdb)
 {
@@ -4236,6 +4249,8 @@ static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
 				scdc->scrambling.low_rates = true;
 		}
 	}
+
+	drm_parse_ycbcr420_deep_color_info(connector, hf_vsdb);
 }
 
 static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index ce2212d..1305fe9 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -156,6 +156,9 @@ struct drm_hdmi_info {
 
 	/** @y420_cmdb_map: bitmap of SVD index, to extraxt vcb modes */
 	unsigned long y420_cmdb_map;
+
+	/** @y420_dc_modes: bitmap of deep color support index */
+	u8 y420_dc_modes;
 };
 
 /**
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 89c0062..d4ff17c 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -213,6 +213,11 @@ struct detailed_timing {
 #define DRM_EDID_HDMI_DC_30               (1 << 4)
 #define DRM_EDID_HDMI_DC_Y444             (1 << 3)
 
+/* YCBCR 420 deep color modes */
+#define DRM_EDID_YCBCR420_DC_48		  (1 << 6)
+#define DRM_EDID_YCBCR420_DC_36		  (1 << 5)
+#define DRM_EDID_YCBCR420_DC_30		  (1 << 4)
+
 /* ELD Header Block */
 #define DRM_ELD_HEADER_BLOCK_SIZE	4
 
-- 
2.7.4