[PATCH 2/3] drm/drm_edid: Add helper to get max FRL rate for an HDMI sink

[Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>]

Move the common function for getting the max FRL rate for an HDMI sink,
from intel_dp.c to drm/drm_edid.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c              | 38 +++++++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_dp.c | 19 ++++---------
 include/drm/drm_edid.h                  |  2 ++
 3 files changed, 45 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index eb61a1a92dc0..75b538b4c87f 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 from HDMI2.1 sink
+ * @connector - connector with HDMI2.1 sink
+ *
+ * RETURNS:
+ * max frl rate supported by the HDMI2.1 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 HDMI2.1 sink
+ * with DSC1.2 compression.
+ * @connector - connector with HDMI2.1 sink
+ *
+ * RETURNS:
+ * max frl rate supported by the HDMI2.1 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/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 4d4579a301f6..f7fe7de7e553 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2190,22 +2190,13 @@ static int intel_dp_hdmi_sink_max_frl(struct intel_dp *intel_dp)
 {
 	struct intel_connector *intel_connector = intel_dp->attached_connector;
 	struct drm_connector *connector = &intel_connector->base;
-	int max_frl_rate;
-	int max_lanes, rate_per_lane;
-	int max_dsc_lanes, dsc_rate_per_lane;
+	int max_frl = drm_hdmi_sink_max_frl(connector);
+	int dsc_max_frl = drm_hdmi_sink_dsc_max_frl(connector);
 
-	max_lanes = connector->display_info.hdmi.max_lanes;
-	rate_per_lane = connector->display_info.hdmi.max_frl_rate_per_lane;
-	max_frl_rate = max_lanes * rate_per_lane;
+	if (dsc_max_frl)
+		return min(max_frl, dsc_max_frl);
 
-	if (connector->display_info.hdmi.dsc_cap.v_1p2) {
-		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;
-		if (max_dsc_lanes && dsc_rate_per_lane)
-			max_frl_rate = min(max_frl_rate, max_dsc_lanes * dsc_rate_per_lane);
-	}
-
-	return max_frl_rate;
+	return max_frl;
 }
 
 static bool
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