drm/i915/lspcon: Do not send infoframes to non-HDMI sinks

Non-HDMI sinks shouldn't be sent infoframes. Check for that when
using LSPCON.

FIXME: How do we turn off infoframes once enabled? Do we even
       have to?
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200904115354.25336-3-ville.syrjala@linux.intel.comReviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -3581,20 +3581,18 @@ static void intel_ddi_pre_enable(struct intel_atomic_state *state,
 		intel_ddi_pre_enable_hdmi(state, encoder, crtc_state,
 					  conn_state);
 	} else {
-		struct intel_lspcon *lspcon =
-				enc_to_intel_lspcon(encoder);
+		struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
 
 		intel_ddi_pre_enable_dp(state, encoder, crtc_state,
 					conn_state);
-		if (lspcon->active) {
-			struct intel_digital_port *dig_port =
-					enc_to_dig_port(encoder);
 
+		/* FIXME precompute everything properly */
+		/* FIXME how do we turn infoframes off again? */
+		if (dig_port->lspcon.active && dig_port->dp.has_hdmi_sink)
 			dig_port->set_infoframes(encoder,
 						 crtc_state->has_infoframe,
 						 crtc_state, conn_state);
 	}
-	}
 }
 
 static void intel_disable_ddi_buf(struct intel_encoder *encoder,

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -1279,6 +1279,7 @@ struct intel_dp {
 	u8 sink_count;
 	bool link_mst;
 	bool link_trained;
+	bool has_hdmi_sink;
 	bool has_audio;
 	bool reset_link_params;
 	u8 dpcd[DP_RECEIVER_CAP_SIZE];

drivers/gpu/drm/i915/display/intel_dp.c

@@ -6069,7 +6069,11 @@ intel_dp_set_edid(struct intel_dp *intel_dp)
 	edid = intel_dp_get_edid(intel_dp);
 	intel_connector->detect_edid = edid;
 
+	if (edid && edid->input & DRM_EDID_INPUT_DIGITAL) {
+		intel_dp->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
 		intel_dp->has_audio = drm_detect_monitor_audio(edid);
+	}
+
 	drm_dp_cec_set_edid(&intel_dp->aux, edid);
 	intel_dp->edid_quirks = drm_dp_get_edid_quirks(edid);
 }
@@ -6083,6 +6087,7 @@ intel_dp_unset_edid(struct intel_dp *intel_dp)
 	kfree(intel_connector->detect_edid);
 	intel_connector->detect_edid = NULL;
 
+	intel_dp->has_hdmi_sink = false;
 	intel_dp->has_audio = false;
 	intel_dp->edid_quirks = 0;
 }