[PATCH 02/44] drm/i915/hdmi: Add new data members for FRL configuration

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

HDMI supports higher resolutions using Fixed Rate Link.
Source needs to do FRL link training on the 4 lanes before video
stream transmission.

Add the members to crtc_state and intel_hdmi for identifying the FRL
supporting HDMI sink and to maintain the FRL training information after
successful training.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 .../drm/i915/display/intel_display_types.h    |  9 +++++
 drivers/gpu/drm/i915/display/intel_hdmi.c     | 36 +++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 20a07ea06b5e..76fa6debb852 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1687,8 +1687,17 @@ struct intel_hdmi {
 		enum drm_dp_dual_mode_type type;
 		int max_tmds_clock;
 	} dp_dual_mode;
+	bool has_sink_hdmi_21;
+	int max_frl_rate;
+	int max_dsc_frl_rate;
 	struct intel_connector *attached_connector;
 	struct cec_notifier *cec_notifier;
+	struct {
+		bool trained;
+		int lanes;
+		int rate_gbps;
+		int ffe_level;
+	} frl;
 };
 
 struct intel_dp_mst_encoder;
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 9b637e38a1a5..65d91fc9f9ce 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2485,6 +2485,8 @@ intel_hdmi_unset_edid(struct drm_connector *_connector)
 	struct intel_connector *connector = to_intel_connector(_connector);
 	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 
+	intel_hdmi->has_sink_hdmi_21 = false;
+
 	intel_hdmi->dp_dual_mode.type = DRM_DP_DUAL_MODE_NONE;
 	intel_hdmi->dp_dual_mode.max_tmds_clock = 0;
 
@@ -2545,6 +2547,38 @@ intel_hdmi_dp_dual_mode_detect(struct drm_connector *_connector)
 	}
 }
 
+static void
+intel_hdmi_reset_frl_config(struct intel_hdmi *intel_hdmi)
+{
+	intel_hdmi->frl.trained = false;
+	intel_hdmi->frl.lanes = 0;
+	intel_hdmi->frl.rate_gbps = 0;
+	intel_hdmi->frl.ffe_level = 0;
+}
+
+static void
+intel_hdmi_init_frl_config(struct intel_connector *connector)
+{
+	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
+	struct intel_encoder *encoder = &hdmi_to_dig_port(intel_hdmi)->base;
+	int max_src_frl_rate =
+		DIV_ROUND_UP(intel_bios_hdmi_max_frl_rate(encoder), 1000000) * 4;
+	int max_sink_dsc_frl_rate =
+		intel_hdmi_sink_dsc_max_frl_rate(&connector->base);
+	int max_sink_frl_rate =
+		intel_hdmi_sink_max_frl_rate(&connector->base);
+
+	intel_hdmi->has_sink_hdmi_21 = max_sink_frl_rate > 0;
+
+	intel_hdmi->max_frl_rate = min(max_sink_frl_rate,
+				       max_src_frl_rate);
+
+	intel_hdmi->max_dsc_frl_rate = min(max_sink_dsc_frl_rate,
+					   max_src_frl_rate);
+
+	intel_hdmi_reset_frl_config(intel_hdmi);
+}
+
 static bool
 intel_hdmi_set_edid(struct drm_connector *_connector)
 {
@@ -2576,6 +2610,8 @@ intel_hdmi_set_edid(struct drm_connector *_connector)
 	if (drm_edid_is_digital(drm_edid)) {
 		intel_hdmi_dp_dual_mode_detect(&connector->base);
 
+		intel_hdmi_init_frl_config(connector);
+
 		connected = true;
 	}
 
-- 
2.50.1