drm/i915/lnl+/tc: Use the cached max lane count value

Use the cached max lane count value on LNL+, to account for scenarios
where this value is queried after the HW cleared the corresponding pin
assignment value in the TCSS_DDI_STATUS register after the sink got
disconnected.

For consistency, follow-up changes will use the cached max lane count
value on other platforms as well and will also cache the pin assignment
value in a similar way.

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/20250811080152.906216-5-imre.deak@intel.com
(cherry picked from commit afc4e84388079f4d5ba05271632b7a4d8d85165c)
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 3f9842040bb014e29d48624bb66d1124f6b999f6..6a2442a0649ee09603dbc795c177600b86dbe704 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -395,12 +395,16 @@ static void read_pin_configuration(struct intel_tc_port *tc)
 
 int intel_tc_port_max_lane_count(struct intel_digital_port *dig_port)
 {
+       struct intel_display *display = to_intel_display(dig_port);
        struct intel_tc_port *tc = to_tc_port(dig_port);
 
        if (!intel_encoder_is_tc(&dig_port->base))
                return 4;
 
-       return get_max_lane_count(tc);
+       if (DISPLAY_VER(display) < 20)
+               return get_max_lane_count(tc);
+
+       return tc->max_lane_count;
 }
 
 void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,