drm/i915/dp: Make has_gamut_metadata_dip() non static

Make has_gamut_metadata_dip() non static so it can also be used to
at other places eg in intel_dp_aux_backlight. So that we can check
if HW is capable of sending SDP which helps us decide if we use
AUX based HDR control or via SDP.

--v2
-State reason the function is needed [Arun]
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240507040407.1056061-2-suraj.kandpal@intel.com

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

@@ -6364,8 +6364,8 @@ bool intel_dp_is_port_edp(struct drm_i915_private *i915, enum port port)
 	return _intel_dp_is_port_edp(i915, devdata, port);
 }
 
-static bool
-has_gamut_metadata_dip(struct intel_encoder *encoder)
+bool
+intel_dp_has_gamut_metadata_dip(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	enum port port = encoder->port;
@@ -6412,7 +6412,7 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
 		intel_attach_dp_colorspace_property(connector);
 	}
 
-	if (has_gamut_metadata_dip(&dp_to_dig_port(intel_dp)->base))
+	if (intel_dp_has_gamut_metadata_dip(&dp_to_dig_port(intel_dp)->base))
 		drm_connector_attach_hdr_output_metadata_property(connector);
 
 	if (HAS_VRR(dev_priv))

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

@@ -196,5 +196,6 @@ intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
 					struct link_config_limits *limits);
 
 void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_connector *connector);
+bool intel_dp_has_gamut_metadata_dip(struct intel_encoder *encoder);
 
 #endif /* __INTEL_DP_H__ */