[Intel-gfx] [PATCH v2 2/4] drm/edid: Add helper to get max FRL rate for an HDMI sink

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

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

v2: Fix the subject line and documentation of the helpers (Jani).
Split the helper definitions and usage into separate patches. (Jani).

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@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 eb61a1a92dc0..c209fd6b24a2 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -6176,3 +6176,41 @@ void drm_update_tile_info(struct drm_connector *connector,
 		connector->tile_group = NULL;
 	}
 }
+
+/**
+ * drm_hdmi_sink_max_frl - 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(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);
+
+/**
+ * drm_hdmi_sink_dsc_max_frl - 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(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);
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 18f6c700f6d0..5003e1254c44 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -592,6 +592,8 @@ drm_display_mode_from_cea_vic(struct drm_device *dev,
 			      u8 video_code);
 const u8 *drm_find_edid_extension(const struct edid *edid,
 				  int ext_id, int *ext_index);
+int drm_hdmi_sink_max_frl(struct drm_connector *connector);
+int drm_hdmi_sink_dsc_max_frl(struct drm_connector *connector);
 
 
 #endif /* __DRM_EDID_H__ */
-- 
2.25.1