This patch does following:
- Adds a new structure (drm_hdmi_info) in drm_display_info.
This structure will be used to save and indicate if sink
supports advance HDMI 2.0 features
- Checks the HF-VSDB block for presence of SCDC, and marks it
in hdmi_info structure.
- If SCDC is present, checks if sink is capable of generating
scdc read request, and marks it in hdmi_info structure.
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 14 ++++++++++++++
include/drm/drm_connector.h | 26 ++++++++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 96d3e47..37902e5 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3802,6 +3802,18 @@ enum hdmi_quantization_range
}
EXPORT_SYMBOL(drm_default_rgb_quant_range);
+static void drm_detect_hdmi_scdc(struct drm_connector *connector,
+ const u8 *hf_vsdb)
+{
+ struct drm_hdmi_info *hdmi = &connector->display_info.hdmi_info;
+
+ if (hf_vsdb[6] & 0x80) {
+ hdmi->scdc_supported = true;
+ if (hf_vsdb[6] & 0x40)
+ hdmi->scdc_rr = true;
+ }
+}
+
static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
const u8 *hdmi)
{
@@ -3916,6 +3928,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
if (cea_db_is_hdmi_vsdb(db))
drm_parse_hdmi_vsdb_video(connector, db);
+ if (cea_db_is_hdmi_forum_vsdb(db))
+ drm_detect_hdmi_scdc(connector, db);
}
}
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index e5e1edd..2435598 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -87,6 +87,27 @@ enum subpixel_order {
SubPixelVerticalRGB,
SubPixelVerticalBGR,
SubPixelNone,
+
+};
+
+/**
+ * struct drm_hdmi_info - runtime data about the connected sink
+ *
+ * Describes if a given hdmi display supports advance HDMI 2.0 featutes.
+ * This information is available in CEA-861-F extension blocks (like
+ * HF-VSDB)
+ * For sinks which provide an EDID this can be filled out by calling
+ * drm_add_edid_modes().
+ */
+struct drm_hdmi_info {
+ /**
+ * @scdc_supported: status control & data channel present.
+ */
+ bool scdc_supported;
+ /**
+ * @scdc_rr: sink is capable of generating scdc read request.
+ */
+ bool scdc_rr;
};
/**
@@ -188,6 +209,11 @@ struct drm_display_info {
* @cea_rev: CEA revision of the HDMI sink.
*/
u8 cea_rev;
+
+ /**
+ * @hdmi_info: advance features of a HDMI sink.
+ */
+ struct drm_hdmi_info hdmi_info;
};
int drm_display_info_set_bus_formats(struct drm_display_info *info,
--
1.9.1
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