drm/i915/dp: Factor out intel_dp_update_sink_caps()

Factor out a function updating the sink's link rate and lane count
capabilities, used by a follow-up patch enabling the DP tunnel BW
allocation mode.
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240220211841.448846-9-imre.deak@intel.com

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

@@ -3944,6 +3944,13 @@ intel_dp_has_sink_count(struct intel_dp *intel_dp)
 					  &intel_dp->desc);
 }
 
+void intel_dp_update_sink_caps(struct intel_dp *intel_dp)
+{
+	intel_dp_set_sink_rates(intel_dp);
+	intel_dp_set_max_sink_lane_count(intel_dp);
+	intel_dp_set_common_rates(intel_dp);
+}
+
 static bool
 intel_dp_get_dpcd(struct intel_dp *intel_dp)
 {
@@ -3960,9 +3967,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
 		drm_dp_read_desc(&intel_dp->aux, &intel_dp->desc,
 				 drm_dp_is_branch(intel_dp->dpcd));
 
-		intel_dp_set_sink_rates(intel_dp);
-		intel_dp_set_max_sink_lane_count(intel_dp);
-		intel_dp_set_common_rates(intel_dp);
+		intel_dp_update_sink_caps(intel_dp);
 	}
 
 	if (intel_dp_has_sink_count(intel_dp)) {

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

@@ -104,6 +104,7 @@ int intel_dp_config_required_rate(const struct intel_crtc_state *crtc_state);
 int intel_dp_rate_select(struct intel_dp *intel_dp, int rate);
 int intel_dp_max_common_rate(struct intel_dp *intel_dp);
 int intel_dp_max_common_lane_count(struct intel_dp *intel_dp);
+void intel_dp_update_sink_caps(struct intel_dp *intel_dp);
 
 void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
 			   u8 *link_bw, u8 *rate_select);