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

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 6cb52cba474b2bec1a3018d3dbf75292059a29a1)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 6a2442a0649ee09603dbc795c177600b86dbe704..668ef139391b4f999b4e009076eebabe8cd45d59 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -1498,11 +1498,11 @@ 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);