[Intel-gfx] [PATCH 1/5] drm/i915/dp: Add helper to check DSC1.2 for HDMI2.1 DFP

[Ankit Nautiyal]

Add helper function to check if Downstream HDMI 2.1 sink supports
DSC1.2.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 32292c0be2bd..fdf82373a22d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -118,6 +118,15 @@ bool intel_dp_is_edp(struct intel_dp *intel_dp)
 static void intel_dp_unset_edid(struct intel_dp *intel_dp);
 static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc);
 
+static bool
+is_dfp_hdmi_sink_dsc_1_2(struct intel_dp *intel_dp)
+{
+	struct intel_connector *intel_connector = intel_dp->attached_connector;
+	struct drm_connector *connector = &intel_connector->base;
+
+	return connector->display_info.hdmi.dsc_cap.v_1p2;
+}
+
 /* Is link rate UHBR and thus 128b/132b? */
 bool intel_dp_is_uhbr(const struct intel_crtc_state *crtc_state)
 {
@@ -2393,7 +2402,7 @@ static int intel_dp_hdmi_sink_max_frl(struct intel_dp *intel_dp)
 	rate_per_lane = connector->display_info.hdmi.max_frl_rate_per_lane;
 	max_frl_rate = max_lanes * rate_per_lane;
 
-	if (connector->display_info.hdmi.dsc_cap.v_1p2) {
+	if (is_dfp_hdmi_sink_dsc_1_2(intel_dp)) {
 		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)
@@ -2605,7 +2614,7 @@ intel_dp_pcon_dsc_configure(struct intel_dp *intel_dp,
 	if (!intel_connector)
 		return;
 	connector = &intel_connector->base;
-	hdmi_is_dsc_1_2 = connector->display_info.hdmi.dsc_cap.v_1p2;
+	hdmi_is_dsc_1_2 = is_dfp_hdmi_sink_dsc_1_2(intel_dp);
 
 	if (!drm_dp_pcon_enc_is_dsc_1_2(intel_dp->pcon_dsc_dpcd) ||
 	    !hdmi_is_dsc_1_2)
-- 
2.25.1