[PATCH 14/15] drm/i915/dp: Add a wrapper to check frl/tmds downstream constraints

[Ankit Nautiyal]

Add a wrapper function to check dp_downstream clock/bandwidth
constraints. Based on whether the sink supports FRL/TMDS the wrapper
calls the appropriate FRL/TMDS functions.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 43 +++++++++++--------------
 1 file changed, 18 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index f9d65f4d3196..41c3416cbf17 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1052,6 +1052,18 @@ intel_dp_frl_bw_valid(struct intel_dp *intel_dp, int target_clock,
 	return MODE_OK;
 }
 
+static enum drm_mode_status
+intel_dp_hdmi_bw_check(struct intel_dp *intel_dp,
+		       int target_clock, int bpc,
+		       enum intel_output_format sink_format,
+		       bool is_frl)
+{
+	if (is_frl)
+		return intel_dp_frl_bw_valid(intel_dp, target_clock, 8, sink_format);
+
+	return intel_dp_tmds_clock_valid(intel_dp, target_clock, 8, sink_format, true);
+}
+
 static enum drm_mode_status
 intel_dp_mode_valid_downstream(struct intel_connector *connector,
 			       const struct drm_display_mode *mode,
@@ -1061,42 +1073,23 @@ intel_dp_mode_valid_downstream(struct intel_connector *connector,
 	const struct drm_display_info *info = &connector->base.display_info;
 	enum drm_mode_status status;
 	enum intel_output_format sink_format = intel_dp_sink_format(connector, mode);
+	bool is_frl = intel_dp->dfp.pcon_max_frl_bw ? true : false;
+	int bpc = 8; /* Assume 8bpc for the DP++/HDMI/DVI TMDS/FRL bw check */
 
-	/* If PCON supports FRL MODE, check FRL bandwidth constraints */
-	if (intel_dp->dfp.pcon_max_frl_bw) {
-		/* Assume 8bpc for the HDMI2.1 FRL BW check */
-		status = intel_dp_frl_bw_valid(intel_dp, target_clock, 8, sink_format);
-		if (status != MODE_OK) {
-			if (sink_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
-			    !connector->base.ycbcr_420_allowed ||
-			    !drm_mode_is_420_also(info, mode))
-				return status;
-
-			sink_format = INTEL_OUTPUT_FORMAT_YCBCR420;
-			status = intel_dp_frl_bw_valid(intel_dp, target_clock, 8, sink_format);
-			if (status != MODE_OK)
-				return status;
-		}
-
-		return MODE_OK;
-	}
-
-	if (intel_dp->dfp.max_dotclock &&
+	if (!is_frl && intel_dp->dfp.max_dotclock &&
 	    target_clock > intel_dp->dfp.max_dotclock)
 		return MODE_CLOCK_HIGH;
 
-	/* Assume 8bpc for the DP++/HDMI/DVI TMDS clock check */
-	status = intel_dp_tmds_clock_valid(intel_dp, target_clock,
-					   8, sink_format, true);
+	status = intel_dp_hdmi_bw_check(intel_dp, target_clock, bpc, sink_format, is_frl);
 
 	if (status != MODE_OK) {
 		if (sink_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
 		    !connector->base.ycbcr_420_allowed ||
 		    !drm_mode_is_420_also(info, mode))
 			return status;
+
 		sink_format = INTEL_OUTPUT_FORMAT_YCBCR420;
-		status = intel_dp_tmds_clock_valid(intel_dp, target_clock,
-						   8, sink_format, true);
+		status = intel_dp_hdmi_bw_check(intel_dp, target_clock, bpc, sink_format, is_frl);
 		if (status != MODE_OK)
 			return status;
 	}
-- 
2.25.1