drm/i915/icl+/tc: Convert AUX powered WARN to a debug message

commit d7fa575 upstream.

The BIOS can leave the AUX power well enabled on an output, even if this
isn't required (on platforms where the AUX power is only needed for an
AUX access). This was observed at least on PTL. To avoid the WARN which
would be triggered by this during the HW readout, convert the WARN to a
debug message.

Cc: stable@vger.kernel.org # v6.8+
Reported-by: Charlton Lin <charlton.lin@intel.com>
Tested-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250811080152.906216-6-imre.deak@intel.com
(cherry picked from commit 6cb52cb)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: ideak

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

@@ -1497,11 +1497,11 @@ static void intel_tc_port_reset_mode(struct intel_tc_port *tc,
 	intel_display_power_flush_work(display);
 	if (!intel_tc_cold_requires_aux_pw(dig_port)) {
 		enum intel_display_power_domain aux_domain;
-		bool aux_powered;
 
 		aux_domain = intel_aux_power_domain(dig_port);
-		aux_powered = intel_display_power_is_enabled(display, aux_domain);
-		drm_WARN_ON(display->drm, aux_powered);
+		if (intel_display_power_is_enabled(display, aux_domain))
+			drm_dbg_kms(display->drm, "Port %s: AUX unexpectedly powered\n",
+				    tc->port_name);
 	}
 
 	tc_phy_disconnect(tc);