[PATCH 05/11] drm: 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.

Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Jose Abreu <joab...@synopsys.com>
Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
---
 drivers/gpu/drm/drm_edid.c  | 15 +++++++++++++++
 include/drm/drm_connector.h |  1 +
 include/drm/drm_edid.h      |  5 +++++
 3 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index d01b7df..828b781 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4151,6 +4151,19 @@ 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->ycbcr420_dc_modes |= DRM_EDID_YCBCR420_DC_48;
+       if (db[7] & DRM_EDID_YCBCR420_DC_36)
+               info->ycbcr420_dc_modes |= DRM_EDID_YCBCR420_DC_36;
+       if (db[7] & DRM_EDID_YCBCR420_DC_30)
+               info->ycbcr420_dc_modes |= DRM_EDID_YCBCR420_DC_30;
+}
+
 static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
                                 const u8 *hf_vsdb)
 {
@@ -4191,6 +4204,8 @@ 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 dbfa6a1..4545c6e 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -136,6 +136,7 @@ struct drm_scdc {
 struct drm_hdmi_info {
        /** @scdc: sink's scdc support and capabilities */
        struct drm_scdc scdc;
+       u8 ycbcr420_dc_modes;
        u64 ycbcr420_vcb_map;
 };
 
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index c07eb81..a4d174e7 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

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