drm/i915/tc: Unify the way to get the pin assignment on all platforms

Unify the way to get the pin assignment on all platforms. This removes
the duplication in the helper functions in this and a follow-up change.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://lore.kernel.org/r/20250805073700.642107-14-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 0170967241633114cc95397dd56c91acfb4dd430..62d60f02d0c61f207283d0d120370c01bb5e8449 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -277,23 +277,32 @@ static u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port)
        return lane_mask >> DP_LANE_ASSIGNMENT_SHIFT(tc->phy_fia_idx);
 }
 
-enum intel_tc_pin_assignment
-intel_tc_port_get_pin_assignment(struct intel_digital_port *dig_port)
+static enum intel_tc_pin_assignment
+get_pin_assignment(struct intel_tc_port *tc)
 {
-       struct intel_display *display = to_intel_display(dig_port);
-       struct intel_tc_port *tc = to_tc_port(dig_port);
+       struct intel_display *display = to_intel_display(tc->dig_port);
+       enum tc_port tc_port = intel_encoder_to_tc(&tc->dig_port->base);
        enum intel_tc_pin_assignment pin_assignment;
        intel_wakeref_t wakeref;
+       i915_reg_t reg;
+       u32 mask;
        u32 val;
 
+       if (DISPLAY_VER(display) >= 20) {
+               reg = TCSS_DDI_STATUS(tc_port);
+               mask = TCSS_DDI_STATUS_PIN_ASSIGNMENT_MASK;
+       } else {
+               reg = PORT_TX_DFLEXPA1(tc->phy_fia);
+               mask = DP_PIN_ASSIGNMENT_MASK(tc->phy_fia_idx);
+       }
+
        with_intel_display_power(display, POWER_DOMAIN_DISPLAY_CORE, wakeref)
-               val = intel_de_read(display, PORT_TX_DFLEXPA1(tc->phy_fia));
+               val = intel_de_read(display, reg);
 
        drm_WARN_ON(display->drm, val == 0xffffffff);
        assert_tc_cold_blocked(tc);
 
-       pin_assignment = (val & DP_PIN_ASSIGNMENT_MASK(tc->phy_fia_idx)) >>
-                        DP_PIN_ASSIGNMENT_SHIFT(tc->phy_fia_idx);
+       pin_assignment = (val & mask) >> (ffs(mask) - 1);
 
        switch (pin_assignment) {
        case INTEL_TC_PIN_ASSIGNMENT_A:
@@ -315,21 +324,10 @@ intel_tc_port_get_pin_assignment(struct intel_digital_port *dig_port)
 
 static int lnl_tc_port_get_max_lane_count(struct intel_digital_port *dig_port)
 {
-       struct intel_display *display = to_intel_display(dig_port);
-       enum tc_port tc_port = intel_encoder_to_tc(&dig_port->base);
        struct intel_tc_port *tc = to_tc_port(dig_port);
        enum intel_tc_pin_assignment pin_assignment;
-       intel_wakeref_t wakeref;
-       u32 val;
 
-       with_intel_display_power(display, POWER_DOMAIN_DISPLAY_CORE, wakeref)
-               val = intel_de_read(display, TCSS_DDI_STATUS(tc_port));
-
-       drm_WARN_ON(display->drm, val == 0xffffffff);
-       assert_tc_cold_blocked(tc);
-
-       pin_assignment =
-               REG_FIELD_GET(TCSS_DDI_STATUS_PIN_ASSIGNMENT_MASK, val);
+       pin_assignment = get_pin_assignment(tc);
 
        switch (pin_assignment) {
        case INTEL_TC_PIN_ASSIGNMENT_NONE:
@@ -347,9 +345,10 @@ static int lnl_tc_port_get_max_lane_count(struct intel_digital_port *dig_port)
 
 static int mtl_tc_port_get_max_lane_count(struct intel_digital_port *dig_port)
 {
+       struct intel_tc_port *tc = to_tc_port(dig_port);
        enum intel_tc_pin_assignment pin_assignment;
 
-       pin_assignment = intel_tc_port_get_pin_assignment(dig_port);
+       pin_assignment = get_pin_assignment(tc);
 
        switch (pin_assignment) {
        case INTEL_TC_PIN_ASSIGNMENT_NONE:
@@ -420,6 +419,14 @@ int intel_tc_port_max_lane_count(struct intel_digital_port *dig_port)
        return tc->max_lane_count;
 }
 
+enum intel_tc_pin_assignment
+intel_tc_port_get_pin_assignment(struct intel_digital_port *dig_port)
+{
+       struct intel_tc_port *tc = to_tc_port(dig_port);
+
+       return get_pin_assignment(tc);
+}
+
 void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,
                                      int required_lanes)
 {