drm/i915/adlp/tc: Fix PHY connected check for Thunderbolt mode

On ADL-P the PHY ready (aka status complete on other platforms) flag is
always set, besides when a DP-alt, legacy sink is connected also when a
TBT sink is connected or nothing is connected. So assume the PHY to be
connected when both the TBT live status and PHY ready flags are set.

Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210921002313.1132357-3-imre.deak@intel.com

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

@@ -509,6 +509,10 @@ static bool icl_tc_phy_is_connected(struct intel_digital_port *dig_port)
 		return dig_port->tc_mode == TC_PORT_TBT_ALT;
 	}
 
+	/* On ADL-P the PHY complete flag is set in TBT mode as well. */
+	if (IS_ALDERLAKE_P(i915) && dig_port->tc_mode == TC_PORT_TBT_ALT)
+		return true;
+
 	if (!tc_phy_is_owned(dig_port)) {
 		drm_dbg_kms(&i915->drm, "Port %s: PHY not owned\n",
 			    dig_port->tc_port_name);