drm/i915/tc: Cache the pin assignment value

Cache the pin assignment value. This is more consistent with the way the
max lane count value is tracked and a bit more efficient than reading
out the same value from HW each time it's queried.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://lore.kernel.org/r/20250805073700.642107-19-imre.deak@intel.com
Signed-off-by: Imre Deak <imre.deak@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 3e53332f804f88669dd493f3e5cb23710ed6c03e..706f60a7d291de157beb874c32ea7d29d442d0fc 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -61,6 +61,7 @@ struct intel_tc_port {
        enum tc_port_mode mode;
        enum tc_port_mode init_mode;
        enum phy_fia phy_fia;
+       enum intel_tc_pin_assignment pin_assignment;
        u8 phy_fia_idx;
        u8 max_lane_count;
 };
@@ -382,6 +383,7 @@ static int get_max_lane_count(struct intel_tc_port *tc)
 
 static void read_pin_configuration(struct intel_tc_port *tc)
 {
+       tc->pin_assignment = get_pin_assignment(tc);
        tc->max_lane_count = get_max_lane_count(tc);
 }
 
@@ -403,7 +405,7 @@ intel_tc_port_get_pin_assignment(struct intel_digital_port *dig_port)
        if (!intel_encoder_is_tc(&dig_port->base))
                return INTEL_TC_PIN_ASSIGNMENT_NONE;
 
-       return get_pin_assignment(tc);
+       return tc->pin_assignment;
 }
 
 void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,