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

[ Upstream commit d7fa5754e83cd36c4327eb2d806064e598a72ff6 ]

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>
[ display->drm API => i915->drm ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 6f2ee7dbc43b359dc80f78f740c2c61b3599b033..10bf7baf8726bb315bc3fe2dfc5a21b8e149b5b5 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -1416,7 +1416,8 @@ static void intel_tc_port_reset_mode(struct intel_tc_port *tc,
 
                aux_domain = intel_aux_power_domain(dig_port);
                aux_powered = intel_display_power_is_enabled(i915, aux_domain);
-               drm_WARN_ON(&i915->drm, aux_powered);
+               drm_dbg_kms(&i915->drm, "Port %s: AUX powered %d\n",
+                           tc->port_name, aux_powered);
        }
 
        tc_phy_disconnect(tc);