[PATCH 02/23] 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.

v2: Use new wrapper while getting max bpc also.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 54 ++++++++++++-------------
 1 file changed, 27 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index d3577c372bf1..23acb96d4bf0 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1074,6 +1074,25 @@ intel_dp_frl_bw_valid(struct intel_dp *intel_dp, int target_clock,
 	return MODE_OK;
 }
 
+static bool
+pcon_sink_pair_support_frl(struct intel_dp *intel_dp)
+{
+	return intel_dp->dfp.pcon_max_frl_bw && intel_dp_hdmi_sink_max_frl(intel_dp);
+}
+
+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 respect_downstream_limits)
+{
+	if (pcon_sink_pair_support_frl(intel_dp))
+		return intel_dp_frl_bw_valid(intel_dp, target_clock, bpc, sink_format);
+
+	return intel_dp_tmds_clock_valid(intel_dp, target_clock, bpc, sink_format,
+					 respect_downstream_limits);
+}
+
 static enum drm_mode_status
 intel_dp_mode_valid_downstream(struct intel_connector *connector,
 			       const struct drm_display_mode *mode,
@@ -1083,42 +1102,23 @@ 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);
+	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 && intel_dp_hdmi_sink_max_frl(intel_dp)) {
-		/* 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 (!intel_dp_hdmi_sink_max_frl(intel_dp) &&
+	    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, true);
 
 	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, true);
 		if (status != MODE_OK)
 			return status;
 	}
@@ -1385,8 +1385,8 @@ static int intel_dp_hdmi_compute_bpc(struct intel_dp *intel_dp,
 	for (; bpc >= 8; bpc -= 2) {
 		if (intel_hdmi_bpc_possible(crtc_state, bpc,
 					    intel_dp_has_hdmi_sink(intel_dp)) &&
-		    intel_dp_tmds_clock_valid(intel_dp, clock, bpc, crtc_state->sink_format,
-					      respect_downstream_limits) == MODE_OK)
+		    intel_dp_hdmi_bw_check(intel_dp, clock, bpc, crtc_state->sink_format,
+					   respect_downstream_limits) == MODE_OK)
 			return bpc;
 	}
 
-- 
2.40.1