[RFC 01/15] drm/edid: Add helper to get max FRL rate for an HDMI sink

[Ankit Nautiyal]

Add the helpers for getting the max FRL rate with and without DSC
for an HDMI sink.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/drm_edid.c | 38 ++++++++++++++++++++++++++++++++++++++
 include/drm/drm_edid.h     |  2 ++
 2 files changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index b2d61c05f559..5961399c31ba 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -7182,3 +7182,41 @@ static void _drm_update_tile_info(struct drm_connector *connector,
 		connector->tile_group = NULL;
 	}
 }
+
+/**
+ * drm_hdmi_sink_max_frl_rate - get the max frl rate, if supported
+ * @connector - connector with HDMI sink
+ *
+ * RETURNS:
+ * max frl rate supported by the HDMI sink, 0 if FRL not supported
+ */
+int drm_hdmi_sink_max_frl_rate(struct drm_connector *connector)
+{
+	int max_lanes = connector->display_info.hdmi.max_lanes;
+	int rate_per_lane = connector->display_info.hdmi.max_frl_rate_per_lane;
+
+	return max_lanes * rate_per_lane;
+}
+EXPORT_SYMBOL(drm_hdmi_sink_max_frl_rate);
+
+/**
+ * drm_hdmi_sink_dsc_max_frl_rate - get the max frl rate from HDMI sink with
+ * DSC1.2 compression.
+ * @connector - connector with HDMI sink
+ *
+ * RETURNS:
+ * max frl rate supported by the HDMI sink with DSC1.2, 0 if FRL not supported
+ */
+int drm_hdmi_sink_dsc_max_frl_rate(struct drm_connector *connector)
+{
+	int max_dsc_lanes, dsc_rate_per_lane;
+
+	if (!connector->display_info.hdmi.dsc_cap.v_1p2)
+		return 0;
+
+	max_dsc_lanes = connector->display_info.hdmi.dsc_cap.max_lanes;
+	dsc_rate_per_lane = connector->display_info.hdmi.dsc_cap.max_frl_rate_per_lane;
+
+	return max_dsc_lanes * dsc_rate_per_lane;
+}
+EXPORT_SYMBOL(drm_hdmi_sink_dsc_max_frl_rate);
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 372963600f1d..c567826eee58 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -611,5 +611,7 @@ int drm_edid_connector_update(struct drm_connector *connector,
 			      const struct drm_edid *edid);
 const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid,
 				  int ext_id, int *ext_index);
+int drm_hdmi_sink_max_frl_rate(struct drm_connector *connector);
+int drm_hdmi_sink_dsc_max_frl_rate(struct drm_connector *connector);
 
 #endif /* __DRM_EDID_H__ */
-- 
2.25.1