drm/i915/mtl: Add TC port lockdep assert to AUX power well enabling

Similarly to earlier platforms, assert in the MTL AUX power well
enabling handler for TC AUX CH power wells that the TC port using the
AUX CH is locked.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230830140421.2031111-2-imre.deak@intel.com

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

@@ -1794,6 +1794,11 @@ static void xelpdp_aux_power_well_enable(struct drm_i915_private *dev_priv,
 					 struct i915_power_well *power_well)
 {
 	enum aux_ch aux_ch = i915_power_well_instance(power_well)->xelpdp.aux_ch;
+	enum phy phy = icl_aux_pw_to_phy(dev_priv, power_well);
+
+	if (intel_phy_is_tc(dev_priv, phy))
+		icl_tc_port_assert_ref_held(dev_priv, power_well,
+					    aux_ch_to_digital_port(dev_priv, aux_ch));
 
 	intel_de_rmw(dev_priv, XELPDP_DP_AUX_CH_CTL(aux_ch),
 		     XELPDP_DP_AUX_CH_CTL_POWER_REQUEST,