drm/i915/dp: Write the source OUI for eDP before detecting sink capab…

…ilities

The eDP sink's capabilities, like DSC, may depend on the source OUI
written to the sink, so ensure the OUI is written before reading out the
capabilities.

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/20241025160259.3088727-7-imre.deak@intel.com

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

@@ -4199,6 +4199,12 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp, struct intel_connector *connector
 		intel_dp->use_max_params = intel_dp->edp_dpcd[0] < DP_EDP_14;
 	}
 
+	/*
+	 * If needed, program our source OUI so we can make various Intel-specific AUX services
+	 * available (such as HDR backlight controls)
+	 */
+	intel_dp_init_source_oui(intel_dp);
+
 	/*
 	 * This has to be called after intel_dp->edp_dpcd is filled, PSR checks
 	 * for SET_POWER_CAPABLE bit in intel_dp->edp_dpcd[1]
@@ -4211,12 +4217,6 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp, struct intel_connector *connector
 	/* Read the eDP DSC DPCD registers */
 	intel_dp_detect_dsc_caps(intel_dp, connector);
 
-	/*
-	 * If needed, program our source OUI so we can make various Intel-specific AUX services
-	 * available (such as HDR backlight controls)
-	 */
-	intel_dp_init_source_oui(intel_dp);
-
 	return true;
 }